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kernel/kprobes.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Kernel Probes (KProbes) * kernel/kprobes.c * |
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* Copyright (C) IBM Corporation, 2002, 2004 * * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel * Probes initial implementation (includes suggestions from * Rusty Russell). * 2004-Aug Updated by Prasanna S Panchamukhi <prasanna@in.ibm.com> with * hlists and exceptions notifier as suggested by Andi Kleen. * 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes * interface to access function arguments. * 2004-Sep Prasanna S Panchamukhi <prasanna@in.ibm.com> Changed Kprobes * exceptions notifier to be first on the priority list. |
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* 2005-May Hien Nguyen <hien@us.ibm.com>, Jim Keniston * <jkenisto@us.ibm.com> and Prasanna S Panchamukhi * <prasanna@in.ibm.com> added function-return probes. |
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*/ #include <linux/kprobes.h> |
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#include <linux/hash.h> #include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/stddef.h> |
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#include <linux/export.h> |
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#include <linux/moduleloader.h> |
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#include <linux/kallsyms.h> |
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#include <linux/freezer.h> |
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#include <linux/seq_file.h> #include <linux/debugfs.h> |
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#include <linux/sysctl.h> |
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#include <linux/kdebug.h> |
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#include <linux/memory.h> |
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#include <linux/ftrace.h> |
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#include <linux/cpu.h> |
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#include <linux/jump_label.h> |
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|
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#include <asm/sections.h> |
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#include <asm/cacheflush.h> #include <asm/errno.h> |
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#include <linux/uaccess.h> |
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#define KPROBE_HASH_BITS 6 #define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS) |
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|
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static int kprobes_initialized; |
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static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE]; |
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static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE]; |
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|
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/* NOTE: change this value only with kprobe_mutex held */ |
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static bool kprobes_all_disarmed; |
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|
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/* This protects kprobe_table and optimizing_list */ static DEFINE_MUTEX(kprobe_mutex); |
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static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL; |
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static struct { |
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raw_spinlock_t lock ____cacheline_aligned_in_smp; |
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} kretprobe_table_locks[KPROBE_TABLE_SIZE]; |
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kprobe_opcode_t * __weak kprobe_lookup_name(const char *name, unsigned int __unused) |
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{ return ((kprobe_opcode_t *)(kallsyms_lookup_name(name))); } |
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static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash) |
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{ return &(kretprobe_table_locks[hash].lock); } |
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|
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/* Blacklist -- list of struct kprobe_blacklist_entry */ static LIST_HEAD(kprobe_blacklist); |
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|
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#ifdef __ARCH_WANT_KPROBES_INSN_SLOT |
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/* * kprobe->ainsn.insn points to the copy of the instruction to be * single-stepped. x86_64, POWER4 and above have no-exec support and * stepping on the instruction on a vmalloced/kmalloced/data page * is a recipe for disaster */ |
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struct kprobe_insn_page { |
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struct list_head list; |
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kprobe_opcode_t *insns; /* Page of instruction slots */ |
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struct kprobe_insn_cache *cache; |
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int nused; |
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int ngarbage; |
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char slot_used[]; |
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}; |
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#define KPROBE_INSN_PAGE_SIZE(slots) \ (offsetof(struct kprobe_insn_page, slot_used) + \ (sizeof(char) * (slots))) |
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static int slots_per_page(struct kprobe_insn_cache *c) { return PAGE_SIZE/(c->insn_size * sizeof(kprobe_opcode_t)); } |
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enum kprobe_slot_state { SLOT_CLEAN = 0, SLOT_DIRTY = 1, SLOT_USED = 2, }; |
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void __weak *alloc_insn_page(void) |
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{ return module_alloc(PAGE_SIZE); } |
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void __weak free_insn_page(void *page) |
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{ |
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module_memfree(page); |
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} |
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struct kprobe_insn_cache kprobe_insn_slots = { .mutex = __MUTEX_INITIALIZER(kprobe_insn_slots.mutex), |
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.alloc = alloc_insn_page, .free = free_insn_page, |
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.pages = LIST_HEAD_INIT(kprobe_insn_slots.pages), .insn_size = MAX_INSN_SIZE, .nr_garbage = 0, }; |
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static int collect_garbage_slots(struct kprobe_insn_cache *c); |
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|
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/** |
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* __get_insn_slot() - Find a slot on an executable page for an instruction. |
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* We allocate an executable page if there's no room on existing ones. */ |
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kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c) |
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{ struct kprobe_insn_page *kip; |
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kprobe_opcode_t *slot = NULL; |
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|
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/* Since the slot array is not protected by rcu, we need a mutex */ |
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mutex_lock(&c->mutex); |
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retry: |
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rcu_read_lock(); list_for_each_entry_rcu(kip, &c->pages, list) { |
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if (kip->nused < slots_per_page(c)) { |
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int i; |
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for (i = 0; i < slots_per_page(c); i++) { |
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if (kip->slot_used[i] == SLOT_CLEAN) { kip->slot_used[i] = SLOT_USED; |
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kip->nused++; |
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slot = kip->insns + (i * c->insn_size); |
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rcu_read_unlock(); |
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goto out; |
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} } |
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/* kip->nused is broken. Fix it. */ kip->nused = slots_per_page(c); WARN_ON(1); |
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} } |
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rcu_read_unlock(); |
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/* If there are any garbage slots, collect it and try again. */ |
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if (c->nr_garbage && collect_garbage_slots(c) == 0) |
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goto retry; |
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/* All out of space. Need to allocate a new page. */ kip = kmalloc(KPROBE_INSN_PAGE_SIZE(slots_per_page(c)), GFP_KERNEL); |
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if (!kip) |
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goto out; |
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/* * Use module_alloc so this page is within +/- 2GB of where the * kernel image and loaded module images reside. This is required * so x86_64 can correctly handle the %rip-relative fixups. */ |
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kip->insns = c->alloc(); |
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if (!kip->insns) { kfree(kip); |
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goto out; |
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} |
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INIT_LIST_HEAD(&kip->list); |
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memset(kip->slot_used, SLOT_CLEAN, slots_per_page(c)); |
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kip->slot_used[0] = SLOT_USED; |
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kip->nused = 1; |
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kip->ngarbage = 0; |
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kip->cache = c; |
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list_add_rcu(&kip->list, &c->pages); |
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slot = kip->insns; out: mutex_unlock(&c->mutex); return slot; |
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} |
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/* Return 1 if all garbages are collected, otherwise 0. */ |
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static int collect_one_slot(struct kprobe_insn_page *kip, int idx) |
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{ |
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kip->slot_used[idx] = SLOT_CLEAN; |
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kip->nused--; if (kip->nused == 0) { /* * Page is no longer in use. Free it unless * it's the last one. We keep the last one * so as not to have to set it up again the * next time somebody inserts a probe. */ |
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if (!list_is_singular(&kip->list)) { |
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list_del_rcu(&kip->list); synchronize_rcu(); |
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kip->cache->free(kip->insns); |
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kfree(kip); } return 1; } return 0; } |
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static int collect_garbage_slots(struct kprobe_insn_cache *c) |
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{ |
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struct kprobe_insn_page *kip, *next; |
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/* Ensure no-one is interrupted on the garbages */ |
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synchronize_rcu(); |
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|
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list_for_each_entry_safe(kip, next, &c->pages, list) { |
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int i; |
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if (kip->ngarbage == 0) continue; kip->ngarbage = 0; /* we will collect all garbages */ |
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for (i = 0; i < slots_per_page(c); i++) { |
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if (kip->slot_used[i] == SLOT_DIRTY && collect_one_slot(kip, i)) |
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break; } } |
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c->nr_garbage = 0; |
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return 0; } |
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void __free_insn_slot(struct kprobe_insn_cache *c, kprobe_opcode_t *slot, int dirty) |
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{ struct kprobe_insn_page *kip; |
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long idx; |
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|
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mutex_lock(&c->mutex); |
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rcu_read_lock(); list_for_each_entry_rcu(kip, &c->pages, list) { idx = ((long)slot - (long)kip->insns) / (c->insn_size * sizeof(kprobe_opcode_t)); if (idx >= 0 && idx < slots_per_page(c)) |
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goto out; |
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} |
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/* Could not find this slot. */ |
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WARN_ON(1); |
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kip = NULL; |
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out: |
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rcu_read_unlock(); /* Mark and sweep: this may sleep */ if (kip) { /* Check double free */ WARN_ON(kip->slot_used[idx] != SLOT_USED); if (dirty) { kip->slot_used[idx] = SLOT_DIRTY; kip->ngarbage++; if (++c->nr_garbage > slots_per_page(c)) collect_garbage_slots(c); } else { collect_one_slot(kip, idx); } } |
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mutex_unlock(&c->mutex); |
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} |
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|
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/* * Check given address is on the page of kprobe instruction slots. * This will be used for checking whether the address on a stack * is on a text area or not. */ bool __is_insn_slot_addr(struct kprobe_insn_cache *c, unsigned long addr) { struct kprobe_insn_page *kip; bool ret = false; rcu_read_lock(); list_for_each_entry_rcu(kip, &c->pages, list) { if (addr >= (unsigned long)kip->insns && addr < (unsigned long)kip->insns + PAGE_SIZE) { ret = true; break; } } rcu_read_unlock(); return ret; } |
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#ifdef CONFIG_OPTPROBES /* For optimized_kprobe buffer */ |
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struct kprobe_insn_cache kprobe_optinsn_slots = { .mutex = __MUTEX_INITIALIZER(kprobe_optinsn_slots.mutex), |
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.alloc = alloc_insn_page, .free = free_insn_page, |
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.pages = LIST_HEAD_INIT(kprobe_optinsn_slots.pages), /* .insn_size is initialized later */ .nr_garbage = 0, }; |
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#endif |
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#endif |
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|
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/* We have preemption disabled.. so it is safe to use __ versions */ static inline void set_kprobe_instance(struct kprobe *kp) { |
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__this_cpu_write(kprobe_instance, kp); |
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} static inline void reset_kprobe_instance(void) { |
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__this_cpu_write(kprobe_instance, NULL); |
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} |
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/* * This routine is called either: |
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* - under the kprobe_mutex - during kprobe_[un]register() |
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* OR |
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* - with preemption disabled - from arch/xxx/kernel/kprobes.c |
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*/ |
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struct kprobe *get_kprobe(void *addr) |
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{ struct hlist_head *head; |
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struct kprobe *p; |
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head = &kprobe_table[hash_ptr(addr, KPROBE_HASH_BITS)]; |
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hlist_for_each_entry_rcu(p, head, hlist, lockdep_is_held(&kprobe_mutex)) { |
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if (p->addr == addr) return p; } |
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|
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return NULL; } |
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NOKPROBE_SYMBOL(get_kprobe); |
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|
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static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs); |
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/* Return true if the kprobe is an aggregator */ static inline int kprobe_aggrprobe(struct kprobe *p) { return p->pre_handler == aggr_pre_handler; } |
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/* Return true(!0) if the kprobe is unused */ static inline int kprobe_unused(struct kprobe *p) { return kprobe_aggrprobe(p) && kprobe_disabled(p) && list_empty(&p->list); } |
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/* * Keep all fields in the kprobe consistent */ |
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static inline void copy_kprobe(struct kprobe *ap, struct kprobe *p) |
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{ |
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memcpy(&p->opcode, &ap->opcode, sizeof(kprobe_opcode_t)); memcpy(&p->ainsn, &ap->ainsn, sizeof(struct arch_specific_insn)); |
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} #ifdef CONFIG_OPTPROBES |
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/* NOTE: change this value only with kprobe_mutex held */ static bool kprobes_allow_optimization; |
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/* * Call all pre_handler on the list, but ignores its return value. * This must be called from arch-dep optimized caller. */ |
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void opt_pre_handler(struct kprobe *p, struct pt_regs *regs) |
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{ struct kprobe *kp; list_for_each_entry_rcu(kp, &p->list, list) { if (kp->pre_handler && likely(!kprobe_disabled(kp))) { set_kprobe_instance(kp); |
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kp->pre_handler(kp, regs); |
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} reset_kprobe_instance(); } } |
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366 |
NOKPROBE_SYMBOL(opt_pre_handler); |
afd66255b kprobes: Introduc... |
367 |
|
6274de498 kprobes: Support ... |
368 |
/* Free optimized instructions and optimized_kprobe */ |
55479f647 kprobes: Allow pr... |
369 |
static void free_aggr_kprobe(struct kprobe *p) |
6274de498 kprobes: Support ... |
370 371 372 373 374 375 376 377 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); arch_remove_optimized_kprobe(op); arch_remove_kprobe(p); kfree(op); } |
afd66255b kprobes: Introduc... |
378 379 380 381 382 383 384 385 386 387 388 389 |
/* Return true(!0) if the kprobe is ready for optimization. */ static inline int kprobe_optready(struct kprobe *p) { struct optimized_kprobe *op; if (kprobe_aggrprobe(p)) { op = container_of(p, struct optimized_kprobe, kp); return arch_prepared_optinsn(&op->optinsn); } return 0; } |
6274de498 kprobes: Support ... |
390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 |
/* Return true(!0) if the kprobe is disarmed. Note: p must be on hash list */ static inline int kprobe_disarmed(struct kprobe *p) { struct optimized_kprobe *op; /* If kprobe is not aggr/opt probe, just return kprobe is disabled */ if (!kprobe_aggrprobe(p)) return kprobe_disabled(p); op = container_of(p, struct optimized_kprobe, kp); return kprobe_disabled(p) && list_empty(&op->list); } /* Return true(!0) if the probe is queued on (un)optimizing lists */ |
55479f647 kprobes: Allow pr... |
405 |
static int kprobe_queued(struct kprobe *p) |
6274de498 kprobes: Support ... |
406 407 408 409 410 411 412 413 414 415 |
{ struct optimized_kprobe *op; if (kprobe_aggrprobe(p)) { op = container_of(p, struct optimized_kprobe, kp); if (!list_empty(&op->list)) return 1; } return 0; } |
afd66255b kprobes: Introduc... |
416 417 418 419 |
/* * Return an optimized kprobe whose optimizing code replaces * instructions including addr (exclude breakpoint). */ |
55479f647 kprobes: Allow pr... |
420 |
static struct kprobe *get_optimized_kprobe(unsigned long addr) |
afd66255b kprobes: Introduc... |
421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 |
{ int i; struct kprobe *p = NULL; struct optimized_kprobe *op; /* Don't check i == 0, since that is a breakpoint case. */ for (i = 1; !p && i < MAX_OPTIMIZED_LENGTH; i++) p = get_kprobe((void *)(addr - i)); if (p && kprobe_optready(p)) { op = container_of(p, struct optimized_kprobe, kp); if (arch_within_optimized_kprobe(op, addr)) return p; } return NULL; } /* Optimization staging list, protected by kprobe_mutex */ static LIST_HEAD(optimizing_list); |
6274de498 kprobes: Support ... |
441 |
static LIST_HEAD(unoptimizing_list); |
7b959fc58 kprobes: Fix to f... |
442 |
static LIST_HEAD(freeing_list); |
afd66255b kprobes: Introduc... |
443 444 445 446 |
static void kprobe_optimizer(struct work_struct *work); static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer); #define OPTIMIZE_DELAY 5 |
61f4e13ff kprobes: Separate... |
447 448 449 450 |
/* * Optimize (replace a breakpoint with a jump) kprobes listed on * optimizing_list. */ |
55479f647 kprobes: Allow pr... |
451 |
static void do_optimize_kprobes(void) |
afd66255b kprobes: Introduc... |
452 |
{ |
f1c6ece23 kprobes: Fix pote... |
453 |
lockdep_assert_held(&text_mutex); |
afd66255b kprobes: Introduc... |
454 455 456 457 458 459 460 |
/* * The optimization/unoptimization refers online_cpus via * stop_machine() and cpu-hotplug modifies online_cpus. * And same time, text_mutex will be held in cpu-hotplug and here. * This combination can cause a deadlock (cpu-hotplug try to lock * text_mutex but stop_machine can not be done because online_cpus * has been changed) |
2d1e38f56 kprobes: Cure hot... |
461 |
* To avoid this deadlock, caller must have locked cpu hotplug |
afd66255b kprobes: Introduc... |
462 463 |
* for preventing cpu-hotplug outside of text_mutex locking. */ |
2d1e38f56 kprobes: Cure hot... |
464 465 466 467 468 469 |
lockdep_assert_cpus_held(); /* Optimization never be done when disarmed */ if (kprobes_all_disarmed || !kprobes_allow_optimization || list_empty(&optimizing_list)) return; |
cd7ebe229 kprobes: Use text... |
470 |
arch_optimize_kprobes(&optimizing_list); |
61f4e13ff kprobes: Separate... |
471 |
} |
6274de498 kprobes: Support ... |
472 473 474 475 |
/* * Unoptimize (replace a jump with a breakpoint and remove the breakpoint * if need) kprobes listed on unoptimizing_list. */ |
55479f647 kprobes: Allow pr... |
476 |
static void do_unoptimize_kprobes(void) |
6274de498 kprobes: Support ... |
477 478 |
{ struct optimized_kprobe *op, *tmp; |
f1c6ece23 kprobes: Fix pote... |
479 |
lockdep_assert_held(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
480 481 |
/* See comment in do_optimize_kprobes() */ lockdep_assert_cpus_held(); |
6274de498 kprobes: Support ... |
482 483 484 |
/* Unoptimization must be done anytime */ if (list_empty(&unoptimizing_list)) return; |
7b959fc58 kprobes: Fix to f... |
485 |
arch_unoptimize_kprobes(&unoptimizing_list, &freeing_list); |
f984ba4eb kprobes: Use text... |
486 |
/* Loop free_list for disarming */ |
7b959fc58 kprobes: Fix to f... |
487 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
74c515e04 kprobes: Set unop... |
488 489 |
/* Switching from detour code to origin */ op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
490 491 492 493 494 495 496 497 498 499 |
/* Disarm probes if marked disabled */ if (kprobe_disabled(&op->kp)) arch_disarm_kprobe(&op->kp); if (kprobe_unused(&op->kp)) { /* * Remove unused probes from hash list. After waiting * for synchronization, these probes are reclaimed. * (reclaiming is done by do_free_cleaned_kprobes.) */ hlist_del_rcu(&op->kp.hlist); |
6274de498 kprobes: Support ... |
500 501 502 |
} else list_del_init(&op->list); } |
6274de498 kprobes: Support ... |
503 504 505 |
} /* Reclaim all kprobes on the free_list */ |
55479f647 kprobes: Allow pr... |
506 |
static void do_free_cleaned_kprobes(void) |
6274de498 kprobes: Support ... |
507 508 |
{ struct optimized_kprobe *op, *tmp; |
7b959fc58 kprobes: Fix to f... |
509 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
6274de498 kprobes: Support ... |
510 |
list_del_init(&op->list); |
cbdd96f55 kprobes: Don't ca... |
511 512 513 514 515 516 517 |
if (WARN_ON_ONCE(!kprobe_unused(&op->kp))) { /* * This must not happen, but if there is a kprobe * still in use, keep it on kprobes hash list. */ continue; } |
6274de498 kprobes: Support ... |
518 519 520 521 522 |
free_aggr_kprobe(&op->kp); } } /* Start optimizer after OPTIMIZE_DELAY passed */ |
55479f647 kprobes: Allow pr... |
523 |
static void kick_kprobe_optimizer(void) |
6274de498 kprobes: Support ... |
524 |
{ |
ad72b3bea kprobes: fix wait... |
525 |
schedule_delayed_work(&optimizing_work, OPTIMIZE_DELAY); |
6274de498 kprobes: Support ... |
526 |
} |
61f4e13ff kprobes: Separate... |
527 |
/* Kprobe jump optimizer */ |
55479f647 kprobes: Allow pr... |
528 |
static void kprobe_optimizer(struct work_struct *work) |
61f4e13ff kprobes: Separate... |
529 |
{ |
72ef3794c kprobes: Inverse ... |
530 |
mutex_lock(&kprobe_mutex); |
2d1e38f56 kprobes: Cure hot... |
531 |
cpus_read_lock(); |
f1c6ece23 kprobes: Fix pote... |
532 |
mutex_lock(&text_mutex); |
61f4e13ff kprobes: Separate... |
533 534 |
/* Lock modules while optimizing kprobes */ mutex_lock(&module_mutex); |
61f4e13ff kprobes: Separate... |
535 536 |
/* |
6274de498 kprobes: Support ... |
537 538 539 |
* Step 1: Unoptimize kprobes and collect cleaned (unused and disarmed) * kprobes before waiting for quiesence period. */ |
7b959fc58 kprobes: Fix to f... |
540 |
do_unoptimize_kprobes(); |
6274de498 kprobes: Support ... |
541 542 |
/* |
a30b85df7 kprobes: Use sync... |
543 544 545 546 547 548 549 |
* Step 2: Wait for quiesence period to ensure all potentially * preempted tasks to have normally scheduled. Because optprobe * may modify multiple instructions, there is a chance that Nth * instruction is preempted. In that case, such tasks can return * to 2nd-Nth byte of jump instruction. This wait is for avoiding it. * Note that on non-preemptive kernel, this is transparently converted * to synchronoze_sched() to wait for all interrupts to have completed. |
61f4e13ff kprobes: Separate... |
550 |
*/ |
a30b85df7 kprobes: Use sync... |
551 |
synchronize_rcu_tasks(); |
61f4e13ff kprobes: Separate... |
552 |
|
6274de498 kprobes: Support ... |
553 |
/* Step 3: Optimize kprobes after quiesence period */ |
61f4e13ff kprobes: Separate... |
554 |
do_optimize_kprobes(); |
6274de498 kprobes: Support ... |
555 556 |
/* Step 4: Free cleaned kprobes after quiesence period */ |
7b959fc58 kprobes: Fix to f... |
557 |
do_free_cleaned_kprobes(); |
6274de498 kprobes: Support ... |
558 |
|
afd66255b kprobes: Introduc... |
559 |
mutex_unlock(&module_mutex); |
f1c6ece23 kprobes: Fix pote... |
560 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
561 |
cpus_read_unlock(); |
6274de498 kprobes: Support ... |
562 |
|
cd7ebe229 kprobes: Use text... |
563 |
/* Step 5: Kick optimizer again if needed */ |
f984ba4eb kprobes: Use text... |
564 |
if (!list_empty(&optimizing_list) || !list_empty(&unoptimizing_list)) |
cd7ebe229 kprobes: Use text... |
565 |
kick_kprobe_optimizer(); |
c19f0c3c9 kprobes: Fix to p... |
566 567 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
568 569 570 |
} /* Wait for completing optimization and unoptimization */ |
30e7d894c tracing/kprobes: ... |
571 |
void wait_for_kprobe_optimizer(void) |
6274de498 kprobes: Support ... |
572 |
{ |
ad72b3bea kprobes: fix wait... |
573 574 575 576 577 578 579 580 581 582 583 584 585 586 |
mutex_lock(&kprobe_mutex); while (!list_empty(&optimizing_list) || !list_empty(&unoptimizing_list)) { mutex_unlock(&kprobe_mutex); /* this will also make optimizing_work execute immmediately */ flush_delayed_work(&optimizing_work); /* @optimizing_work might not have been queued yet, relax */ cpu_relax(); mutex_lock(&kprobe_mutex); } mutex_unlock(&kprobe_mutex); |
afd66255b kprobes: Introduc... |
587 |
} |
4771b3f60 kprobes: Fix opti... |
588 589 590 591 592 593 594 595 596 597 598 |
static bool optprobe_queued_unopt(struct optimized_kprobe *op) { struct optimized_kprobe *_op; list_for_each_entry(_op, &unoptimizing_list, list) { if (op == _op) return true; } return false; } |
afd66255b kprobes: Introduc... |
599 |
/* Optimize kprobe if p is ready to be optimized */ |
55479f647 kprobes: Allow pr... |
600 |
static void optimize_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
601 602 603 604 |
{ struct optimized_kprobe *op; /* Check if the kprobe is disabled or not ready for optimization. */ |
b2be84df9 kprobes: Jump opt... |
605 |
if (!kprobe_optready(p) || !kprobes_allow_optimization || |
afd66255b kprobes: Introduc... |
606 607 |
(kprobe_disabled(p) || kprobes_all_disarmed)) return; |
059053a27 kprobes: Don't ch... |
608 609 |
/* kprobes with post_handler can not be optimized */ if (p->post_handler) |
afd66255b kprobes: Introduc... |
610 611 612 613 614 615 616 617 618 |
return; op = container_of(p, struct optimized_kprobe, kp); /* Check there is no other kprobes at the optimized instructions */ if (arch_check_optimized_kprobe(op) < 0) return; /* Check if it is already optimized. */ |
4771b3f60 kprobes: Fix opti... |
619 620 621 622 623 |
if (op->kp.flags & KPROBE_FLAG_OPTIMIZED) { if (optprobe_queued_unopt(op)) { /* This is under unoptimizing. Just dequeue the probe */ list_del_init(&op->list); } |
afd66255b kprobes: Introduc... |
624 |
return; |
4771b3f60 kprobes: Fix opti... |
625 |
} |
afd66255b kprobes: Introduc... |
626 |
op->kp.flags |= KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
627 |
|
4771b3f60 kprobes: Fix opti... |
628 629 630 631 632 633 |
/* On unoptimizing/optimizing_list, op must have OPTIMIZED flag */ if (WARN_ON_ONCE(!list_empty(&op->list))) return; list_add(&op->list, &optimizing_list); kick_kprobe_optimizer(); |
6274de498 kprobes: Support ... |
634 635 636 |
} /* Short cut to direct unoptimizing */ |
55479f647 kprobes: Allow pr... |
637 |
static void force_unoptimize_kprobe(struct optimized_kprobe *op) |
6274de498 kprobes: Support ... |
638 |
{ |
2d1e38f56 kprobes: Cure hot... |
639 |
lockdep_assert_cpus_held(); |
6274de498 kprobes: Support ... |
640 |
arch_unoptimize_kprobe(op); |
74c515e04 kprobes: Set unop... |
641 |
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
642 643 |
if (kprobe_disabled(&op->kp)) arch_disarm_kprobe(&op->kp); |
afd66255b kprobes: Introduc... |
644 645 646 |
} /* Unoptimize a kprobe if p is optimized */ |
55479f647 kprobes: Allow pr... |
647 |
static void unoptimize_kprobe(struct kprobe *p, bool force) |
afd66255b kprobes: Introduc... |
648 649 |
{ struct optimized_kprobe *op; |
6274de498 kprobes: Support ... |
650 651 652 653 |
if (!kprobe_aggrprobe(p) || kprobe_disarmed(p)) return; /* This is not an optprobe nor optimized */ op = container_of(p, struct optimized_kprobe, kp); |
4771b3f60 kprobes: Fix opti... |
654 |
if (!kprobe_optimized(p)) |
6274de498 kprobes: Support ... |
655 |
return; |
6274de498 kprobes: Support ... |
656 |
|
6274de498 kprobes: Support ... |
657 |
if (!list_empty(&op->list)) { |
4771b3f60 kprobes: Fix opti... |
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 |
if (optprobe_queued_unopt(op)) { /* Queued in unoptimizing queue */ if (force) { /* * Forcibly unoptimize the kprobe here, and queue it * in the freeing list for release afterwards. */ force_unoptimize_kprobe(op); list_move(&op->list, &freeing_list); } } else { /* Dequeue from the optimizing queue */ list_del_init(&op->list); op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; } |
6274de498 kprobes: Support ... |
673 674 |
return; } |
4771b3f60 kprobes: Fix opti... |
675 |
|
6274de498 kprobes: Support ... |
676 |
/* Optimized kprobe case */ |
4771b3f60 kprobes: Fix opti... |
677 |
if (force) { |
6274de498 kprobes: Support ... |
678 679 |
/* Forcibly update the code: this is a special case */ force_unoptimize_kprobe(op); |
4771b3f60 kprobes: Fix opti... |
680 |
} else { |
6274de498 kprobes: Support ... |
681 682 |
list_add(&op->list, &unoptimizing_list); kick_kprobe_optimizer(); |
afd66255b kprobes: Introduc... |
683 684 |
} } |
0490cd1f9 kprobes: Reuse un... |
685 |
/* Cancel unoptimizing for reusing */ |
819319fc9 kprobes: Return e... |
686 |
static int reuse_unused_kprobe(struct kprobe *ap) |
0490cd1f9 kprobes: Reuse un... |
687 688 |
{ struct optimized_kprobe *op; |
0490cd1f9 kprobes: Reuse un... |
689 690 691 692 693 |
/* * Unused kprobe MUST be on the way of delayed unoptimizing (means * there is still a relative jump) and disabled. */ op = container_of(ap, struct optimized_kprobe, kp); |
4458515b2 kprobes: Replace ... |
694 |
WARN_ON_ONCE(list_empty(&op->list)); |
0490cd1f9 kprobes: Reuse un... |
695 696 697 |
/* Enable the probe again */ ap->flags &= ~KPROBE_FLAG_DISABLED; /* Optimize it again (remove from op->list) */ |
5f843ed41 kprobes: Fix erro... |
698 699 |
if (!kprobe_optready(ap)) return -EINVAL; |
819319fc9 kprobes: Return e... |
700 |
|
0490cd1f9 kprobes: Reuse un... |
701 |
optimize_kprobe(ap); |
819319fc9 kprobes: Return e... |
702 |
return 0; |
0490cd1f9 kprobes: Reuse un... |
703 |
} |
afd66255b kprobes: Introduc... |
704 |
/* Remove optimized instructions */ |
55479f647 kprobes: Allow pr... |
705 |
static void kill_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
706 707 708 709 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
6274de498 kprobes: Support ... |
710 711 |
if (!list_empty(&op->list)) /* Dequeue from the (un)optimization queue */ |
afd66255b kprobes: Introduc... |
712 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
713 |
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
7b959fc58 kprobes: Fix to f... |
714 715 716 717 718 719 720 721 722 723 724 |
if (kprobe_unused(p)) { /* Enqueue if it is unused */ list_add(&op->list, &freeing_list); /* * Remove unused probes from the hash list. After waiting * for synchronization, this probe is reclaimed. * (reclaiming is done by do_free_cleaned_kprobes().) */ hlist_del_rcu(&op->kp.hlist); } |
6274de498 kprobes: Support ... |
725 |
/* Don't touch the code, because it is already freed. */ |
afd66255b kprobes: Introduc... |
726 727 |
arch_remove_optimized_kprobe(op); } |
a460246c7 kprobes: Skip pre... |
728 729 730 731 732 733 |
static inline void __prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p) { if (!kprobe_ftrace(p)) arch_prepare_optimized_kprobe(op, p); } |
afd66255b kprobes: Introduc... |
734 |
/* Try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
735 |
static void prepare_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
736 737 738 739 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
a460246c7 kprobes: Skip pre... |
740 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
741 |
} |
afd66255b kprobes: Introduc... |
742 |
/* Allocate new optimized_kprobe and try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
743 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
744 745 746 747 748 749 750 751 752 |
{ struct optimized_kprobe *op; op = kzalloc(sizeof(struct optimized_kprobe), GFP_KERNEL); if (!op) return NULL; INIT_LIST_HEAD(&op->list); op->kp.addr = p->addr; |
a460246c7 kprobes: Skip pre... |
753 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
754 755 756 |
return &op->kp; } |
55479f647 kprobes: Allow pr... |
757 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p); |
afd66255b kprobes: Introduc... |
758 759 760 761 762 |
/* * Prepare an optimized_kprobe and optimize it * NOTE: p must be a normal registered kprobe */ |
55479f647 kprobes: Allow pr... |
763 |
static void try_to_optimize_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
764 765 766 |
{ struct kprobe *ap; struct optimized_kprobe *op; |
ae6aa16fd kprobes: introduc... |
767 768 769 |
/* Impossible to optimize ftrace-based kprobe */ if (kprobe_ftrace(p)) return; |
25764288d kprobes: Move loc... |
770 |
/* For preparing optimization, jump_label_text_reserved() is called */ |
2d1e38f56 kprobes: Cure hot... |
771 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
772 773 |
jump_label_lock(); mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
774 775 |
ap = alloc_aggr_kprobe(p); if (!ap) |
25764288d kprobes: Move loc... |
776 |
goto out; |
afd66255b kprobes: Introduc... |
777 778 779 780 |
op = container_of(ap, struct optimized_kprobe, kp); if (!arch_prepared_optinsn(&op->optinsn)) { /* If failed to setup optimizing, fallback to kprobe */ |
6274de498 kprobes: Support ... |
781 782 |
arch_remove_optimized_kprobe(op); kfree(op); |
25764288d kprobes: Move loc... |
783 |
goto out; |
afd66255b kprobes: Introduc... |
784 785 786 |
} init_aggr_kprobe(ap, p); |
25764288d kprobes: Move loc... |
787 788 789 790 791 |
optimize_kprobe(ap); /* This just kicks optimizer thread */ out: mutex_unlock(&text_mutex); jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
792 |
cpus_read_unlock(); |
afd66255b kprobes: Introduc... |
793 |
} |
b2be84df9 kprobes: Jump opt... |
794 |
#ifdef CONFIG_SYSCTL |
55479f647 kprobes: Allow pr... |
795 |
static void optimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
796 797 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
798 799 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
800 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
801 802 |
/* If optimization is already allowed, just return */ if (kprobes_allow_optimization) |
5c51543b0 kprobes: Fix a do... |
803 |
goto out; |
b2be84df9 kprobes: Jump opt... |
804 |
|
2d1e38f56 kprobes: Cure hot... |
805 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
806 |
kprobes_allow_optimization = true; |
b2be84df9 kprobes: Jump opt... |
807 808 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
809 |
hlist_for_each_entry_rcu(p, head, hlist) |
b2be84df9 kprobes: Jump opt... |
810 811 812 |
if (!kprobe_disabled(p)) optimize_kprobe(p); } |
2d1e38f56 kprobes: Cure hot... |
813 |
cpus_read_unlock(); |
b2be84df9 kprobes: Jump opt... |
814 815 |
printk(KERN_INFO "Kprobes globally optimized "); |
5c51543b0 kprobes: Fix a do... |
816 817 |
out: mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
818 |
} |
55479f647 kprobes: Allow pr... |
819 |
static void unoptimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
820 821 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
822 823 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
824 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
825 |
/* If optimization is already prohibited, just return */ |
5c51543b0 kprobes: Fix a do... |
826 827 |
if (!kprobes_allow_optimization) { mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
828 |
return; |
5c51543b0 kprobes: Fix a do... |
829 |
} |
b2be84df9 kprobes: Jump opt... |
830 |
|
2d1e38f56 kprobes: Cure hot... |
831 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
832 |
kprobes_allow_optimization = false; |
b2be84df9 kprobes: Jump opt... |
833 834 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
835 |
hlist_for_each_entry_rcu(p, head, hlist) { |
b2be84df9 kprobes: Jump opt... |
836 |
if (!kprobe_disabled(p)) |
6274de498 kprobes: Support ... |
837 |
unoptimize_kprobe(p, false); |
b2be84df9 kprobes: Jump opt... |
838 839 |
} } |
2d1e38f56 kprobes: Cure hot... |
840 |
cpus_read_unlock(); |
5c51543b0 kprobes: Fix a do... |
841 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
842 843 844 845 |
/* Wait for unoptimizing completion */ wait_for_kprobe_optimizer(); printk(KERN_INFO "Kprobes globally unoptimized "); |
b2be84df9 kprobes: Jump opt... |
846 |
} |
5c51543b0 kprobes: Fix a do... |
847 |
static DEFINE_MUTEX(kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
848 849 850 851 852 853 |
int sysctl_kprobes_optimization; int proc_kprobes_optimization_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { int ret; |
5c51543b0 kprobes: Fix a do... |
854 |
mutex_lock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
855 856 857 858 859 860 861 |
sysctl_kprobes_optimization = kprobes_allow_optimization ? 1 : 0; ret = proc_dointvec_minmax(table, write, buffer, length, ppos); if (sysctl_kprobes_optimization) optimize_all_kprobes(); else unoptimize_all_kprobes(); |
5c51543b0 kprobes: Fix a do... |
862 |
mutex_unlock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
863 864 865 866 |
return ret; } #endif /* CONFIG_SYSCTL */ |
6274de498 kprobes: Support ... |
867 |
/* Put a breakpoint for a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
868 |
static void __arm_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
869 |
{ |
6d8e40a85 kprobes: Rename o... |
870 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
871 872 |
/* Check collision with other optimized kprobes */ |
6d8e40a85 kprobes: Rename o... |
873 874 |
_p = get_optimized_kprobe((unsigned long)p->addr); if (unlikely(_p)) |
6274de498 kprobes: Support ... |
875 876 |
/* Fallback to unoptimized kprobe */ unoptimize_kprobe(_p, true); |
afd66255b kprobes: Introduc... |
877 878 879 880 |
arch_arm_kprobe(p); optimize_kprobe(p); /* Try to optimize (add kprobe to a list) */ } |
6274de498 kprobes: Support ... |
881 |
/* Remove the breakpoint of a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
882 |
static void __disarm_kprobe(struct kprobe *p, bool reopt) |
afd66255b kprobes: Introduc... |
883 |
{ |
6d8e40a85 kprobes: Rename o... |
884 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
885 |
|
69d54b916 kprobes: makes kp... |
886 887 |
/* Try to unoptimize */ unoptimize_kprobe(p, kprobes_all_disarmed); |
afd66255b kprobes: Introduc... |
888 |
|
6274de498 kprobes: Support ... |
889 890 891 892 893 894 895 896 |
if (!kprobe_queued(p)) { arch_disarm_kprobe(p); /* If another kprobe was blocked, optimize it. */ _p = get_optimized_kprobe((unsigned long)p->addr); if (unlikely(_p) && reopt) optimize_kprobe(_p); } /* TODO: reoptimize others after unoptimized this probe */ |
afd66255b kprobes: Introduc... |
897 898 899 900 901 |
} #else /* !CONFIG_OPTPROBES */ #define optimize_kprobe(p) do {} while (0) |
6274de498 kprobes: Support ... |
902 |
#define unoptimize_kprobe(p, f) do {} while (0) |
afd66255b kprobes: Introduc... |
903 904 905 906 |
#define kill_optimized_kprobe(p) do {} while (0) #define prepare_optimized_kprobe(p) do {} while (0) #define try_to_optimize_kprobe(p) do {} while (0) #define __arm_kprobe(p) arch_arm_kprobe(p) |
6274de498 kprobes: Support ... |
907 908 909 |
#define __disarm_kprobe(p, o) arch_disarm_kprobe(p) #define kprobe_disarmed(p) kprobe_disabled(p) #define wait_for_kprobe_optimizer() do {} while (0) |
afd66255b kprobes: Introduc... |
910 |
|
819319fc9 kprobes: Return e... |
911 |
static int reuse_unused_kprobe(struct kprobe *ap) |
0490cd1f9 kprobes: Reuse un... |
912 |
{ |
819319fc9 kprobes: Return e... |
913 914 915 916 917 918 |
/* * If the optimized kprobe is NOT supported, the aggr kprobe is * released at the same time that the last aggregated kprobe is * unregistered. * Thus there should be no chance to reuse unused kprobe. */ |
0490cd1f9 kprobes: Reuse un... |
919 920 |
printk(KERN_ERR "Error: There should be no unused kprobe here. "); |
819319fc9 kprobes: Return e... |
921 |
return -EINVAL; |
0490cd1f9 kprobes: Reuse un... |
922 |
} |
55479f647 kprobes: Allow pr... |
923 |
static void free_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
924 |
{ |
6274de498 kprobes: Support ... |
925 |
arch_remove_kprobe(p); |
afd66255b kprobes: Introduc... |
926 927 |
kfree(p); } |
55479f647 kprobes: Allow pr... |
928 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
929 930 931 932 |
{ return kzalloc(sizeof(struct kprobe), GFP_KERNEL); } #endif /* CONFIG_OPTPROBES */ |
e7dbfe349 kprobes/x86: Move... |
933 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
934 |
static struct ftrace_ops kprobe_ftrace_ops __read_mostly = { |
e52538965 kprobes/x86: ftra... |
935 |
.func = kprobe_ftrace_handler, |
0bc11ed5a kprobes: Allow kp... |
936 937 938 939 940 |
.flags = FTRACE_OPS_FL_SAVE_REGS, }; static struct ftrace_ops kprobe_ipmodify_ops __read_mostly = { .func = kprobe_ftrace_handler, |
1d70be34d kprobes: Add IPMO... |
941 |
.flags = FTRACE_OPS_FL_SAVE_REGS | FTRACE_OPS_FL_IPMODIFY, |
ae6aa16fd kprobes: introduc... |
942 |
}; |
0bc11ed5a kprobes: Allow kp... |
943 944 |
static int kprobe_ipmodify_enabled; |
ae6aa16fd kprobes: introduc... |
945 946 947 |
static int kprobe_ftrace_enabled; /* Must ensure p->addr is really on ftrace */ |
55479f647 kprobes: Allow pr... |
948 |
static int prepare_kprobe(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
949 950 951 952 953 954 955 956 |
{ if (!kprobe_ftrace(p)) return arch_prepare_kprobe(p); return arch_prepare_kprobe_ftrace(p); } /* Caller must lock kprobe_mutex */ |
0bc11ed5a kprobes: Allow kp... |
957 958 |
static int __arm_kprobe_ftrace(struct kprobe *p, struct ftrace_ops *ops, int *cnt) |
ae6aa16fd kprobes: introduc... |
959 |
{ |
12310e343 kprobes: Propagat... |
960 |
int ret = 0; |
ae6aa16fd kprobes: introduc... |
961 |
|
0bc11ed5a kprobes: Allow kp... |
962 |
ret = ftrace_set_filter_ip(ops, (unsigned long)p->addr, 0, 0); |
12310e343 kprobes: Propagat... |
963 |
if (ret) { |
4458515b2 kprobes: Replace ... |
964 965 966 |
pr_debug("Failed to arm kprobe-ftrace at %pS (%d) ", p->addr, ret); |
12310e343 kprobes: Propagat... |
967 968 |
return ret; } |
0bc11ed5a kprobes: Allow kp... |
969 970 |
if (*cnt == 0) { ret = register_ftrace_function(ops); |
12310e343 kprobes: Propagat... |
971 972 973 974 975 |
if (ret) { pr_debug("Failed to init kprobe-ftrace (%d) ", ret); goto err_ftrace; } |
ae6aa16fd kprobes: introduc... |
976 |
} |
12310e343 kprobes: Propagat... |
977 |
|
0bc11ed5a kprobes: Allow kp... |
978 |
(*cnt)++; |
12310e343 kprobes: Propagat... |
979 980 981 982 |
return ret; err_ftrace: /* |
0bc11ed5a kprobes: Allow kp... |
983 984 |
* At this point, sinec ops is not registered, we should be sefe from * registering empty filter. |
12310e343 kprobes: Propagat... |
985 |
*/ |
0bc11ed5a kprobes: Allow kp... |
986 |
ftrace_set_filter_ip(ops, (unsigned long)p->addr, 1, 0); |
12310e343 kprobes: Propagat... |
987 |
return ret; |
ae6aa16fd kprobes: introduc... |
988 |
} |
0bc11ed5a kprobes: Allow kp... |
989 990 991 992 993 994 995 996 |
static int arm_kprobe_ftrace(struct kprobe *p) { bool ipmodify = (p->post_handler != NULL); return __arm_kprobe_ftrace(p, ipmodify ? &kprobe_ipmodify_ops : &kprobe_ftrace_ops, ipmodify ? &kprobe_ipmodify_enabled : &kprobe_ftrace_enabled); } |
ae6aa16fd kprobes: introduc... |
997 |
/* Caller must lock kprobe_mutex */ |
0bc11ed5a kprobes: Allow kp... |
998 999 |
static int __disarm_kprobe_ftrace(struct kprobe *p, struct ftrace_ops *ops, int *cnt) |
ae6aa16fd kprobes: introduc... |
1000 |
{ |
297f9233b kprobes: Propagat... |
1001 |
int ret = 0; |
ae6aa16fd kprobes: introduc... |
1002 |
|
0bc11ed5a kprobes: Allow kp... |
1003 1004 |
if (*cnt == 1) { ret = unregister_ftrace_function(ops); |
297f9233b kprobes: Propagat... |
1005 1006 1007 |
if (WARN(ret < 0, "Failed to unregister kprobe-ftrace (%d) ", ret)) return ret; |
ae6aa16fd kprobes: introduc... |
1008 |
} |
297f9233b kprobes: Propagat... |
1009 |
|
0bc11ed5a kprobes: Allow kp... |
1010 |
(*cnt)--; |
297f9233b kprobes: Propagat... |
1011 |
|
0bc11ed5a kprobes: Allow kp... |
1012 |
ret = ftrace_set_filter_ip(ops, (unsigned long)p->addr, 1, 0); |
4458515b2 kprobes: Replace ... |
1013 1014 1015 |
WARN_ONCE(ret < 0, "Failed to disarm kprobe-ftrace at %pS (%d) ", p->addr, ret); |
297f9233b kprobes: Propagat... |
1016 |
return ret; |
ae6aa16fd kprobes: introduc... |
1017 |
} |
0bc11ed5a kprobes: Allow kp... |
1018 1019 1020 1021 1022 1023 1024 1025 1026 |
static int disarm_kprobe_ftrace(struct kprobe *p) { bool ipmodify = (p->post_handler != NULL); return __disarm_kprobe_ftrace(p, ipmodify ? &kprobe_ipmodify_ops : &kprobe_ftrace_ops, ipmodify ? &kprobe_ipmodify_enabled : &kprobe_ftrace_enabled); } |
e7dbfe349 kprobes/x86: Move... |
1027 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
b4a9fdf06 kprobes: Fix comp... |
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
static inline int prepare_kprobe(struct kprobe *p) { return arch_prepare_kprobe(p); } static inline int arm_kprobe_ftrace(struct kprobe *p) { return -ENODEV; } static inline int disarm_kprobe_ftrace(struct kprobe *p) { return -ENODEV; } |
ae6aa16fd kprobes: introduc... |
1042 |
#endif |
201517a7f kprobes: fix to u... |
1043 |
/* Arm a kprobe with text_mutex */ |
12310e343 kprobes: Propagat... |
1044 |
static int arm_kprobe(struct kprobe *kp) |
201517a7f kprobes: fix to u... |
1045 |
{ |
12310e343 kprobes: Propagat... |
1046 1047 |
if (unlikely(kprobe_ftrace(kp))) return arm_kprobe_ftrace(kp); |
2d1e38f56 kprobes: Cure hot... |
1048 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
1049 |
mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
1050 |
__arm_kprobe(kp); |
201517a7f kprobes: fix to u... |
1051 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1052 |
cpus_read_unlock(); |
12310e343 kprobes: Propagat... |
1053 1054 |
return 0; |
201517a7f kprobes: fix to u... |
1055 1056 1057 |
} /* Disarm a kprobe with text_mutex */ |
297f9233b kprobes: Propagat... |
1058 |
static int disarm_kprobe(struct kprobe *kp, bool reopt) |
201517a7f kprobes: fix to u... |
1059 |
{ |
297f9233b kprobes: Propagat... |
1060 1061 |
if (unlikely(kprobe_ftrace(kp))) return disarm_kprobe_ftrace(kp); |
2d1e38f56 kprobes: Cure hot... |
1062 1063 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
1064 |
mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
1065 |
__disarm_kprobe(kp, reopt); |
201517a7f kprobes: fix to u... |
1066 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1067 |
cpus_read_unlock(); |
297f9233b kprobes: Propagat... |
1068 1069 |
return 0; |
201517a7f kprobes: fix to u... |
1070 |
} |
64f562c6d [PATCH] kprobes: ... |
1071 1072 1073 1074 |
/* * Aggregate handlers for multiple kprobes support - these handlers * take care of invoking the individual kprobe handlers on p->list */ |
820aede02 kprobes: Use NOKP... |
1075 |
static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs) |
64f562c6d [PATCH] kprobes: ... |
1076 1077 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1078 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1079 |
if (kp->pre_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1080 |
set_kprobe_instance(kp); |
8b0914ea7 [PATCH] jprobes: ... |
1081 1082 |
if (kp->pre_handler(kp, regs)) return 1; |
64f562c6d [PATCH] kprobes: ... |
1083 |
} |
e65845235 [PATCH] Kprobes: ... |
1084 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1085 1086 1087 |
} return 0; } |
820aede02 kprobes: Use NOKP... |
1088 |
NOKPROBE_SYMBOL(aggr_pre_handler); |
64f562c6d [PATCH] kprobes: ... |
1089 |
|
820aede02 kprobes: Use NOKP... |
1090 1091 |
static void aggr_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) |
64f562c6d [PATCH] kprobes: ... |
1092 1093 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1094 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1095 |
if (kp->post_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1096 |
set_kprobe_instance(kp); |
64f562c6d [PATCH] kprobes: ... |
1097 |
kp->post_handler(kp, regs, flags); |
e65845235 [PATCH] Kprobes: ... |
1098 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1099 1100 |
} } |
64f562c6d [PATCH] kprobes: ... |
1101 |
} |
820aede02 kprobes: Use NOKP... |
1102 |
NOKPROBE_SYMBOL(aggr_post_handler); |
64f562c6d [PATCH] kprobes: ... |
1103 |
|
820aede02 kprobes: Use NOKP... |
1104 1105 |
static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs, int trapnr) |
64f562c6d [PATCH] kprobes: ... |
1106 |
{ |
b76834bc1 kprobes: Use this... |
1107 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1108 |
|
64f562c6d [PATCH] kprobes: ... |
1109 1110 1111 1112 |
/* * if we faulted "during" the execution of a user specified * probe handler, invoke just that probe's fault handler */ |
e65845235 [PATCH] Kprobes: ... |
1113 1114 |
if (cur && cur->fault_handler) { if (cur->fault_handler(cur, regs, trapnr)) |
64f562c6d [PATCH] kprobes: ... |
1115 1116 1117 1118 |
return 1; } return 0; } |
820aede02 kprobes: Use NOKP... |
1119 |
NOKPROBE_SYMBOL(aggr_fault_handler); |
64f562c6d [PATCH] kprobes: ... |
1120 |
|
bf8d5c52c [PATCH] kprobes: ... |
1121 |
/* Walks the list and increments nmissed count for multiprobe case */ |
820aede02 kprobes: Use NOKP... |
1122 |
void kprobes_inc_nmissed_count(struct kprobe *p) |
bf8d5c52c [PATCH] kprobes: ... |
1123 1124 |
{ struct kprobe *kp; |
afd66255b kprobes: Introduc... |
1125 |
if (!kprobe_aggrprobe(p)) { |
bf8d5c52c [PATCH] kprobes: ... |
1126 1127 1128 1129 1130 1131 1132 |
p->nmissed++; } else { list_for_each_entry_rcu(kp, &p->list, list) kp->nmissed++; } return; } |
820aede02 kprobes: Use NOKP... |
1133 |
NOKPROBE_SYMBOL(kprobes_inc_nmissed_count); |
bf8d5c52c [PATCH] kprobes: ... |
1134 |
|
820aede02 kprobes: Use NOKP... |
1135 1136 |
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head) |
b94cce926 [PATCH] kprobes: ... |
1137 |
{ |
ef53d9c5e kprobes: improve ... |
1138 |
struct kretprobe *rp = ri->rp; |
b94cce926 [PATCH] kprobes: ... |
1139 1140 |
/* remove rp inst off the rprobe_inst_table */ hlist_del(&ri->hlist); |
ef53d9c5e kprobes: improve ... |
1141 1142 |
INIT_HLIST_NODE(&ri->hlist); if (likely(rp)) { |
ec484608c locking, kprobes:... |
1143 |
raw_spin_lock(&rp->lock); |
ef53d9c5e kprobes: improve ... |
1144 |
hlist_add_head(&ri->hlist, &rp->free_instances); |
ec484608c locking, kprobes:... |
1145 |
raw_spin_unlock(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1146 1147 |
} else /* Unregistering */ |
99219a3fb [PATCH] kretprobe... |
1148 |
hlist_add_head(&ri->hlist, head); |
b94cce926 [PATCH] kprobes: ... |
1149 |
} |
820aede02 kprobes: Use NOKP... |
1150 |
NOKPROBE_SYMBOL(recycle_rp_inst); |
b94cce926 [PATCH] kprobes: ... |
1151 |
|
820aede02 kprobes: Use NOKP... |
1152 |
void kretprobe_hash_lock(struct task_struct *tsk, |
ef53d9c5e kprobes: improve ... |
1153 |
struct hlist_head **head, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1154 |
__acquires(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1155 1156 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1157 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1158 1159 1160 |
*head = &kretprobe_inst_table[hash]; hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1161 |
raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1162 |
} |
820aede02 kprobes: Use NOKP... |
1163 |
NOKPROBE_SYMBOL(kretprobe_hash_lock); |
ef53d9c5e kprobes: improve ... |
1164 |
|
820aede02 kprobes: Use NOKP... |
1165 1166 |
static void kretprobe_table_lock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1167 |
__acquires(hlist_lock) |
b94cce926 [PATCH] kprobes: ... |
1168 |
{ |
ec484608c locking, kprobes:... |
1169 1170 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1171 |
} |
820aede02 kprobes: Use NOKP... |
1172 |
NOKPROBE_SYMBOL(kretprobe_table_lock); |
ef53d9c5e kprobes: improve ... |
1173 |
|
820aede02 kprobes: Use NOKP... |
1174 1175 |
void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1176 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1177 1178 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1179 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1180 1181 |
hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1182 |
raw_spin_unlock_irqrestore(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1183 |
} |
820aede02 kprobes: Use NOKP... |
1184 |
NOKPROBE_SYMBOL(kretprobe_hash_unlock); |
ef53d9c5e kprobes: improve ... |
1185 |
|
820aede02 kprobes: Use NOKP... |
1186 1187 |
static void kretprobe_table_unlock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1188 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1189 |
{ |
ec484608c locking, kprobes:... |
1190 1191 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_unlock_irqrestore(hlist_lock, *flags); |
b94cce926 [PATCH] kprobes: ... |
1192 |
} |
820aede02 kprobes: Use NOKP... |
1193 |
NOKPROBE_SYMBOL(kretprobe_table_unlock); |
b94cce926 [PATCH] kprobes: ... |
1194 |
|
3d390370d kretprobe: Preven... |
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 |
struct kprobe kprobe_busy = { .addr = (void *) get_kprobe, }; void kprobe_busy_begin(void) { struct kprobe_ctlblk *kcb; preempt_disable(); __this_cpu_write(current_kprobe, &kprobe_busy); kcb = get_kprobe_ctlblk(); kcb->kprobe_status = KPROBE_HIT_ACTIVE; } void kprobe_busy_end(void) { __this_cpu_write(current_kprobe, NULL); preempt_enable(); } |
b94cce926 [PATCH] kprobes: ... |
1214 |
/* |
c6fd91f0b [PATCH] kretprobe... |
1215 1216 1217 1218 |
* This function is called from finish_task_switch when task tk becomes dead, * so that we can recycle any function-return probe instances associated * with this task. These left over instances represent probed functions * that have been called but will never return. |
b94cce926 [PATCH] kprobes: ... |
1219 |
*/ |
820aede02 kprobes: Use NOKP... |
1220 |
void kprobe_flush_task(struct task_struct *tk) |
b94cce926 [PATCH] kprobes: ... |
1221 |
{ |
62c27be0d [PATCH] kprobe wh... |
1222 |
struct kretprobe_instance *ri; |
99219a3fb [PATCH] kretprobe... |
1223 |
struct hlist_head *head, empty_rp; |
b67bfe0d4 hlist: drop the n... |
1224 |
struct hlist_node *tmp; |
ef53d9c5e kprobes: improve ... |
1225 |
unsigned long hash, flags = 0; |
802eae7c8 [PATCH] Return pr... |
1226 |
|
ef53d9c5e kprobes: improve ... |
1227 1228 1229 |
if (unlikely(!kprobes_initialized)) /* Early boot. kretprobe_table_locks not yet initialized. */ return; |
3d390370d kretprobe: Preven... |
1230 |
kprobe_busy_begin(); |
d496aab56 kprobes: initiali... |
1231 |
INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5e kprobes: improve ... |
1232 1233 1234 |
hash = hash_ptr(tk, KPROBE_HASH_BITS); head = &kretprobe_inst_table[hash]; kretprobe_table_lock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1235 |
hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
62c27be0d [PATCH] kprobe wh... |
1236 |
if (ri->task == tk) |
99219a3fb [PATCH] kretprobe... |
1237 |
recycle_rp_inst(ri, &empty_rp); |
62c27be0d [PATCH] kprobe wh... |
1238 |
} |
ef53d9c5e kprobes: improve ... |
1239 |
kretprobe_table_unlock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1240 |
hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3fb [PATCH] kretprobe... |
1241 1242 1243 |
hlist_del(&ri->hlist); kfree(ri); } |
3d390370d kretprobe: Preven... |
1244 1245 |
kprobe_busy_end(); |
b94cce926 [PATCH] kprobes: ... |
1246 |
} |
820aede02 kprobes: Use NOKP... |
1247 |
NOKPROBE_SYMBOL(kprobe_flush_task); |
b94cce926 [PATCH] kprobes: ... |
1248 |
|
b94cce926 [PATCH] kprobes: ... |
1249 1250 1251 |
static inline void free_rp_inst(struct kretprobe *rp) { struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1252 |
struct hlist_node *next; |
4c4308cb9 kprobes: kretprob... |
1253 |
|
b67bfe0d4 hlist: drop the n... |
1254 |
hlist_for_each_entry_safe(ri, next, &rp->free_instances, hlist) { |
ef53d9c5e kprobes: improve ... |
1255 |
hlist_del(&ri->hlist); |
b94cce926 [PATCH] kprobes: ... |
1256 1257 1258 |
kfree(ri); } } |
820aede02 kprobes: Use NOKP... |
1259 |
static void cleanup_rp_inst(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1260 |
{ |
ef53d9c5e kprobes: improve ... |
1261 |
unsigned long flags, hash; |
4a296e07c kprobes: add (un)... |
1262 |
struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1263 |
struct hlist_node *next; |
ef53d9c5e kprobes: improve ... |
1264 |
struct hlist_head *head; |
4a296e07c kprobes: add (un)... |
1265 |
/* No race here */ |
ef53d9c5e kprobes: improve ... |
1266 1267 1268 |
for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) { kretprobe_table_lock(hash, &flags); head = &kretprobe_inst_table[hash]; |
b67bfe0d4 hlist: drop the n... |
1269 |
hlist_for_each_entry_safe(ri, next, head, hlist) { |
ef53d9c5e kprobes: improve ... |
1270 1271 1272 1273 |
if (ri->rp == rp) ri->rp = NULL; } kretprobe_table_unlock(hash, &flags); |
4a296e07c kprobes: add (un)... |
1274 |
} |
4a296e07c kprobes: add (un)... |
1275 1276 |
free_rp_inst(rp); } |
820aede02 kprobes: Use NOKP... |
1277 |
NOKPROBE_SYMBOL(cleanup_rp_inst); |
4a296e07c kprobes: add (un)... |
1278 |
|
059053a27 kprobes: Don't ch... |
1279 |
/* Add the new probe to ap->list */ |
55479f647 kprobes: Allow pr... |
1280 |
static int add_new_kprobe(struct kprobe *ap, struct kprobe *p) |
8b0914ea7 [PATCH] jprobes: ... |
1281 |
{ |
059053a27 kprobes: Don't ch... |
1282 |
if (p->post_handler) |
6274de498 kprobes: Support ... |
1283 |
unoptimize_kprobe(ap, true); /* Fall back to normal kprobe */ |
afd66255b kprobes: Introduc... |
1284 |
|
059053a27 kprobes: Don't ch... |
1285 |
list_add_rcu(&p->list, &ap->list); |
b918e5e60 kprobes: cleanup ... |
1286 1287 |
if (p->post_handler && !ap->post_handler) ap->post_handler = aggr_post_handler; |
de5bd88d5 kprobes: support ... |
1288 |
|
8b0914ea7 [PATCH] jprobes: ... |
1289 1290 1291 1292 |
return 0; } /* |
64f562c6d [PATCH] kprobes: ... |
1293 1294 1295 |
* Fill in the required fields of the "manager kprobe". Replace the * earlier kprobe in the hlist with the manager kprobe */ |
55479f647 kprobes: Allow pr... |
1296 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1297 |
{ |
afd66255b kprobes: Introduc... |
1298 |
/* Copy p's insn slot to ap */ |
8b0914ea7 [PATCH] jprobes: ... |
1299 |
copy_kprobe(p, ap); |
a9ad965ea [PATCH] IA64: kpr... |
1300 |
flush_insn_slot(ap); |
64f562c6d [PATCH] kprobes: ... |
1301 |
ap->addr = p->addr; |
afd66255b kprobes: Introduc... |
1302 |
ap->flags = p->flags & ~KPROBE_FLAG_OPTIMIZED; |
64f562c6d [PATCH] kprobes: ... |
1303 |
ap->pre_handler = aggr_pre_handler; |
64f562c6d [PATCH] kprobes: ... |
1304 |
ap->fault_handler = aggr_fault_handler; |
e8386a0cb kprobes: support ... |
1305 1306 |
/* We don't care the kprobe which has gone. */ if (p->post_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1307 |
ap->post_handler = aggr_post_handler; |
64f562c6d [PATCH] kprobes: ... |
1308 1309 |
INIT_LIST_HEAD(&ap->list); |
afd66255b kprobes: Introduc... |
1310 |
INIT_HLIST_NODE(&ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1311 |
|
afd66255b kprobes: Introduc... |
1312 |
list_add_rcu(&p->list, &ap->list); |
adad0f331 [PATCH] kprobes: ... |
1313 |
hlist_replace_rcu(&p->hlist, &ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1314 1315 1316 1317 1318 |
} /* * This is the second or subsequent kprobe at the address - handle * the intricacies |
64f562c6d [PATCH] kprobes: ... |
1319 |
*/ |
55479f647 kprobes: Allow pr... |
1320 |
static int register_aggr_kprobe(struct kprobe *orig_p, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1321 1322 |
{ int ret = 0; |
6d8e40a85 kprobes: Rename o... |
1323 |
struct kprobe *ap = orig_p; |
64f562c6d [PATCH] kprobes: ... |
1324 |
|
2d1e38f56 kprobes: Cure hot... |
1325 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
1326 1327 |
/* For preparing optimization, jump_label_text_reserved() is called */ jump_label_lock(); |
25764288d kprobes: Move loc... |
1328 |
mutex_lock(&text_mutex); |
6d8e40a85 kprobes: Rename o... |
1329 1330 1331 |
if (!kprobe_aggrprobe(orig_p)) { /* If orig_p is not an aggr_kprobe, create new aggr_kprobe. */ ap = alloc_aggr_kprobe(orig_p); |
25764288d kprobes: Move loc... |
1332 1333 1334 1335 |
if (!ap) { ret = -ENOMEM; goto out; } |
6d8e40a85 kprobes: Rename o... |
1336 |
init_aggr_kprobe(ap, orig_p); |
819319fc9 kprobes: Return e... |
1337 |
} else if (kprobe_unused(ap)) { |
0490cd1f9 kprobes: Reuse un... |
1338 |
/* This probe is going to die. Rescue it */ |
819319fc9 kprobes: Return e... |
1339 1340 1341 1342 |
ret = reuse_unused_kprobe(ap); if (ret) goto out; } |
b918e5e60 kprobes: cleanup ... |
1343 1344 |
if (kprobe_gone(ap)) { |
e8386a0cb kprobes: support ... |
1345 1346 1347 1348 1349 1350 |
/* * Attempting to insert new probe at the same location that * had a probe in the module vaddr area which already * freed. So, the instruction slot has already been * released. We need a new slot for the new probe. */ |
b918e5e60 kprobes: cleanup ... |
1351 |
ret = arch_prepare_kprobe(ap); |
e8386a0cb kprobes: support ... |
1352 |
if (ret) |
b918e5e60 kprobes: cleanup ... |
1353 1354 1355 1356 1357 |
/* * Even if fail to allocate new slot, don't need to * free aggr_probe. It will be used next time, or * freed by unregister_kprobe. */ |
25764288d kprobes: Move loc... |
1358 |
goto out; |
de5bd88d5 kprobes: support ... |
1359 |
|
afd66255b kprobes: Introduc... |
1360 1361 |
/* Prepare optimized instructions if possible. */ prepare_optimized_kprobe(ap); |
e8386a0cb kprobes: support ... |
1362 |
/* |
de5bd88d5 kprobes: support ... |
1363 1364 |
* Clear gone flag to prevent allocating new slot again, and * set disabled flag because it is not armed yet. |
e8386a0cb kprobes: support ... |
1365 |
*/ |
de5bd88d5 kprobes: support ... |
1366 1367 |
ap->flags = (ap->flags & ~KPROBE_FLAG_GONE) | KPROBE_FLAG_DISABLED; |
e8386a0cb kprobes: support ... |
1368 |
} |
b918e5e60 kprobes: cleanup ... |
1369 |
|
afd66255b kprobes: Introduc... |
1370 |
/* Copy ap's insn slot to p */ |
b918e5e60 kprobes: cleanup ... |
1371 |
copy_kprobe(ap, p); |
25764288d kprobes: Move loc... |
1372 1373 1374 1375 |
ret = add_new_kprobe(ap, p); out: mutex_unlock(&text_mutex); |
25764288d kprobes: Move loc... |
1376 |
jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
1377 |
cpus_read_unlock(); |
25764288d kprobes: Move loc... |
1378 1379 1380 |
if (ret == 0 && kprobe_disabled(ap) && !kprobe_disabled(p)) { ap->flags &= ~KPROBE_FLAG_DISABLED; |
12310e343 kprobes: Propagat... |
1381 |
if (!kprobes_all_disarmed) { |
25764288d kprobes: Move loc... |
1382 |
/* Arm the breakpoint again. */ |
12310e343 kprobes: Propagat... |
1383 1384 1385 1386 |
ret = arm_kprobe(ap); if (ret) { ap->flags |= KPROBE_FLAG_DISABLED; list_del_rcu(&p->list); |
ae8b7ce76 kprobes: Replace ... |
1387 |
synchronize_rcu(); |
12310e343 kprobes: Propagat... |
1388 1389 |
} } |
25764288d kprobes: Move loc... |
1390 1391 |
} return ret; |
64f562c6d [PATCH] kprobes: ... |
1392 |
} |
be8f27432 kprobes: Prohibit... |
1393 1394 1395 1396 1397 1398 |
bool __weak arch_within_kprobe_blacklist(unsigned long addr) { /* The __kprobes marked functions and entry code must not be probed */ return addr >= (unsigned long)__kprobes_text_start && addr < (unsigned long)__kprobes_text_end; } |
6143c6fb1 kprobes: Search n... |
1399 |
static bool __within_kprobe_blacklist(unsigned long addr) |
d0aaff979 [PATCH] Kprobes: ... |
1400 |
{ |
376e24242 kprobes: Introduc... |
1401 |
struct kprobe_blacklist_entry *ent; |
3d8d996e0 kprobes: prevent ... |
1402 |
|
be8f27432 kprobes: Prohibit... |
1403 |
if (arch_within_kprobe_blacklist(addr)) |
376e24242 kprobes: Introduc... |
1404 |
return true; |
3d8d996e0 kprobes: prevent ... |
1405 1406 1407 1408 |
/* * If there exists a kprobe_blacklist, verify and * fail any probe registration in the prohibited area */ |
376e24242 kprobes: Introduc... |
1409 1410 1411 |
list_for_each_entry(ent, &kprobe_blacklist, list) { if (addr >= ent->start_addr && addr < ent->end_addr) return true; |
3d8d996e0 kprobes: prevent ... |
1412 |
} |
6143c6fb1 kprobes: Search n... |
1413 1414 |
return false; } |
376e24242 kprobes: Introduc... |
1415 |
|
6143c6fb1 kprobes: Search n... |
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 |
bool within_kprobe_blacklist(unsigned long addr) { char symname[KSYM_NAME_LEN], *p; if (__within_kprobe_blacklist(addr)) return true; /* Check if the address is on a suffixed-symbol */ if (!lookup_symbol_name(addr, symname)) { p = strchr(symname, '.'); if (!p) return false; *p = '\0'; addr = (unsigned long)kprobe_lookup_name(symname, 0); if (addr) return __within_kprobe_blacklist(addr); } |
376e24242 kprobes: Introduc... |
1433 |
return false; |
d0aaff979 [PATCH] Kprobes: ... |
1434 |
} |
b2a5cd693 kprobes: fix a nu... |
1435 1436 1437 |
/* * If we have a symbol_name argument, look it up and add the offset field * to it. This way, we can specify a relative address to a symbol. |
bc81d48d1 kprobes: Return -... |
1438 1439 |
* This returns encoded errors if it fails to look up symbol or invalid * combination of parameters. |
b2a5cd693 kprobes: fix a nu... |
1440 |
*/ |
1d585e709 trace/kprobes: Fi... |
1441 1442 |
static kprobe_opcode_t *_kprobe_addr(kprobe_opcode_t *addr, const char *symbol_name, unsigned int offset) |
b2a5cd693 kprobes: fix a nu... |
1443 |
{ |
1d585e709 trace/kprobes: Fi... |
1444 |
if ((symbol_name && addr) || (!symbol_name && !addr)) |
bc81d48d1 kprobes: Return -... |
1445 |
goto invalid; |
1d585e709 trace/kprobes: Fi... |
1446 |
if (symbol_name) { |
7246f6006 Merge tag 'powerp... |
1447 |
addr = kprobe_lookup_name(symbol_name, offset); |
bc81d48d1 kprobes: Return -... |
1448 1449 |
if (!addr) return ERR_PTR(-ENOENT); |
b2a5cd693 kprobes: fix a nu... |
1450 |
} |
1d585e709 trace/kprobes: Fi... |
1451 |
addr = (kprobe_opcode_t *)(((char *)addr) + offset); |
bc81d48d1 kprobes: Return -... |
1452 1453 1454 1455 1456 |
if (addr) return addr; invalid: return ERR_PTR(-EINVAL); |
b2a5cd693 kprobes: fix a nu... |
1457 |
} |
1d585e709 trace/kprobes: Fi... |
1458 1459 1460 1461 |
static kprobe_opcode_t *kprobe_addr(struct kprobe *p) { return _kprobe_addr(p->addr, p->symbol_name, p->offset); } |
1f0ab4097 kprobes: Prevent ... |
1462 |
/* Check passed kprobe is valid and return kprobe in kprobe_table. */ |
55479f647 kprobes: Allow pr... |
1463 |
static struct kprobe *__get_valid_kprobe(struct kprobe *p) |
1f0ab4097 kprobes: Prevent ... |
1464 |
{ |
6d8e40a85 kprobes: Rename o... |
1465 |
struct kprobe *ap, *list_p; |
1f0ab4097 kprobes: Prevent ... |
1466 |
|
6d8e40a85 kprobes: Rename o... |
1467 1468 |
ap = get_kprobe(p->addr); if (unlikely(!ap)) |
1f0ab4097 kprobes: Prevent ... |
1469 |
return NULL; |
6d8e40a85 kprobes: Rename o... |
1470 1471 |
if (p != ap) { list_for_each_entry_rcu(list_p, &ap->list, list) |
1f0ab4097 kprobes: Prevent ... |
1472 1473 1474 1475 1476 1477 |
if (list_p == p) /* kprobe p is a valid probe */ goto valid; return NULL; } valid: |
6d8e40a85 kprobes: Rename o... |
1478 |
return ap; |
1f0ab4097 kprobes: Prevent ... |
1479 1480 1481 1482 1483 1484 |
} /* Return error if the kprobe is being re-registered */ static inline int check_kprobe_rereg(struct kprobe *p) { int ret = 0; |
1f0ab4097 kprobes: Prevent ... |
1485 1486 |
mutex_lock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1487 |
if (__get_valid_kprobe(p)) |
1f0ab4097 kprobes: Prevent ... |
1488 1489 |
ret = -EINVAL; mutex_unlock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1490 |
|
1f0ab4097 kprobes: Prevent ... |
1491 1492 |
return ret; } |
f7f242ff0 kprobes: introduc... |
1493 |
int __weak arch_check_ftrace_location(struct kprobe *p) |
1da177e4c Linux-2.6.12-rc2 |
1494 |
{ |
ae6aa16fd kprobes: introduc... |
1495 |
unsigned long ftrace_addr; |
ae6aa16fd kprobes: introduc... |
1496 1497 |
ftrace_addr = ftrace_location((unsigned long)p->addr); if (ftrace_addr) { |
e7dbfe349 kprobes/x86: Move... |
1498 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
1499 1500 1501 |
/* Given address is not on the instruction boundary */ if ((unsigned long)p->addr != ftrace_addr) return -EILSEQ; |
ae6aa16fd kprobes: introduc... |
1502 |
p->flags |= KPROBE_FLAG_FTRACE; |
e7dbfe349 kprobes/x86: Move... |
1503 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
1504 1505 1506 |
return -EINVAL; #endif } |
f7f242ff0 kprobes: introduc... |
1507 1508 1509 1510 1511 1512 1513 |
return 0; } static int check_kprobe_address_safe(struct kprobe *p, struct module **probed_mod) { int ret; |
1f0ab4097 kprobes: Prevent ... |
1514 |
|
f7f242ff0 kprobes: introduc... |
1515 1516 1517 |
ret = arch_check_ftrace_location(p); if (ret) return ret; |
91bad2f8d jump label: Fix d... |
1518 |
jump_label_lock(); |
de31c3ca8 jump label: Fix e... |
1519 |
preempt_disable(); |
f7fa6ef0d kprobes: cleanup ... |
1520 1521 |
/* Ensure it is not in reserved area nor out of text */ |
ec30c5f3a kprobes: Use kern... |
1522 |
if (!kernel_text_address((unsigned long) p->addr) || |
376e24242 kprobes: Introduc... |
1523 |
within_kprobe_blacklist((unsigned long) p->addr) || |
e336b4027 kprobes: Prohibit... |
1524 1525 |
jump_label_text_reserved(p->addr, p->addr) || find_bug((unsigned long)p->addr)) { |
f986a499e kprobes: return p... |
1526 |
ret = -EINVAL; |
f7fa6ef0d kprobes: cleanup ... |
1527 |
goto out; |
f986a499e kprobes: return p... |
1528 |
} |
b3e55c727 [PATCH] Kprobes: ... |
1529 |
|
f7fa6ef0d kprobes: cleanup ... |
1530 1531 1532 |
/* Check if are we probing a module */ *probed_mod = __module_text_address((unsigned long) p->addr); if (*probed_mod) { |
6f716acd5 kprobes: codingst... |
1533 |
/* |
e8386a0cb kprobes: support ... |
1534 1535 |
* We must hold a refcount of the probed module while updating * its code to prohibit unexpected unloading. |
df019b1d8 [PATCH] kprobes: ... |
1536 |
*/ |
f7fa6ef0d kprobes: cleanup ... |
1537 1538 1539 1540 |
if (unlikely(!try_module_get(*probed_mod))) { ret = -ENOENT; goto out; } |
de31c3ca8 jump label: Fix e... |
1541 |
|
f24659d96 kprobes: support ... |
1542 1543 1544 1545 |
/* * If the module freed .init.text, we couldn't insert * kprobes in there. */ |
f7fa6ef0d kprobes: cleanup ... |
1546 1547 1548 1549 1550 |
if (within_module_init((unsigned long)p->addr, *probed_mod) && (*probed_mod)->state != MODULE_STATE_COMING) { module_put(*probed_mod); *probed_mod = NULL; ret = -ENOENT; |
f24659d96 kprobes: support ... |
1551 |
} |
df019b1d8 [PATCH] kprobes: ... |
1552 |
} |
f7fa6ef0d kprobes: cleanup ... |
1553 |
out: |
a189d0350 kprobes: disable ... |
1554 |
preempt_enable(); |
de31c3ca8 jump label: Fix e... |
1555 |
jump_label_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1556 |
|
f7fa6ef0d kprobes: cleanup ... |
1557 1558 |
return ret; } |
55479f647 kprobes: Allow pr... |
1559 |
int register_kprobe(struct kprobe *p) |
f7fa6ef0d kprobes: cleanup ... |
1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 |
{ int ret; struct kprobe *old_p; struct module *probed_mod; kprobe_opcode_t *addr; /* Adjust probe address from symbol */ addr = kprobe_addr(p); if (IS_ERR(addr)) return PTR_ERR(addr); p->addr = addr; ret = check_kprobe_rereg(p); if (ret) return ret; /* User can pass only KPROBE_FLAG_DISABLED to register_kprobe */ p->flags &= KPROBE_FLAG_DISABLED; |
3516a4604 [PATCH] Kprobes: ... |
1578 |
p->nmissed = 0; |
9861668f7 kprobes: add (un)... |
1579 |
INIT_LIST_HEAD(&p->list); |
afd66255b kprobes: Introduc... |
1580 |
|
f7fa6ef0d kprobes: cleanup ... |
1581 1582 1583 1584 1585 |
ret = check_kprobe_address_safe(p, &probed_mod); if (ret) return ret; mutex_lock(&kprobe_mutex); |
afd66255b kprobes: Introduc... |
1586 |
|
64f562c6d [PATCH] kprobes: ... |
1587 1588 |
old_p = get_kprobe(p->addr); if (old_p) { |
afd66255b kprobes: Introduc... |
1589 |
/* Since this may unoptimize old_p, locking text_mutex. */ |
64f562c6d [PATCH] kprobes: ... |
1590 |
ret = register_aggr_kprobe(old_p, p); |
1da177e4c Linux-2.6.12-rc2 |
1591 1592 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
1593 |
|
2d1e38f56 kprobes: Cure hot... |
1594 1595 1596 |
cpus_read_lock(); /* Prevent text modification */ mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
1597 |
ret = prepare_kprobe(p); |
25764288d kprobes: Move loc... |
1598 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1599 |
cpus_read_unlock(); |
6f716acd5 kprobes: codingst... |
1600 |
if (ret) |
afd66255b kprobes: Introduc... |
1601 |
goto out; |
49a2a1b83 [PATCH] kprobes: ... |
1602 |
|
64f562c6d [PATCH] kprobes: ... |
1603 |
INIT_HLIST_NODE(&p->hlist); |
3516a4604 [PATCH] Kprobes: ... |
1604 |
hlist_add_head_rcu(&p->hlist, |
1da177e4c Linux-2.6.12-rc2 |
1605 |
&kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]); |
12310e343 kprobes: Propagat... |
1606 1607 1608 1609 |
if (!kprobes_all_disarmed && !kprobe_disabled(p)) { ret = arm_kprobe(p); if (ret) { hlist_del_rcu(&p->hlist); |
ae8b7ce76 kprobes: Replace ... |
1610 |
synchronize_rcu(); |
12310e343 kprobes: Propagat... |
1611 1612 1613 |
goto out; } } |
afd66255b kprobes: Introduc... |
1614 1615 1616 |
/* Try to optimize kprobe */ try_to_optimize_kprobe(p); |
1da177e4c Linux-2.6.12-rc2 |
1617 |
out: |
7a7d1cf95 [PATCH] sem2mutex... |
1618 |
mutex_unlock(&kprobe_mutex); |
49a2a1b83 [PATCH] kprobes: ... |
1619 |
|
e8386a0cb kprobes: support ... |
1620 |
if (probed_mod) |
df019b1d8 [PATCH] kprobes: ... |
1621 |
module_put(probed_mod); |
e8386a0cb kprobes: support ... |
1622 |
|
1da177e4c Linux-2.6.12-rc2 |
1623 1624 |
return ret; } |
99081ab55 kprobes: move EXP... |
1625 |
EXPORT_SYMBOL_GPL(register_kprobe); |
1da177e4c Linux-2.6.12-rc2 |
1626 |
|
6f0f1dd71 kprobes: Cleanup ... |
1627 |
/* Check if all probes on the aggrprobe are disabled */ |
55479f647 kprobes: Allow pr... |
1628 |
static int aggr_kprobe_disabled(struct kprobe *ap) |
6f0f1dd71 kprobes: Cleanup ... |
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 |
{ struct kprobe *kp; list_for_each_entry_rcu(kp, &ap->list, list) if (!kprobe_disabled(kp)) /* * There is an active probe on the list. * We can't disable this ap. */ return 0; return 1; } /* Disable one kprobe: Make sure called under kprobe_mutex is locked */ |
55479f647 kprobes: Allow pr... |
1644 |
static struct kprobe *__disable_kprobe(struct kprobe *p) |
6f0f1dd71 kprobes: Cleanup ... |
1645 1646 |
{ struct kprobe *orig_p; |
297f9233b kprobes: Propagat... |
1647 |
int ret; |
6f0f1dd71 kprobes: Cleanup ... |
1648 1649 1650 1651 |
/* Get an original kprobe for return */ orig_p = __get_valid_kprobe(p); if (unlikely(orig_p == NULL)) |
297f9233b kprobes: Propagat... |
1652 |
return ERR_PTR(-EINVAL); |
6f0f1dd71 kprobes: Cleanup ... |
1653 1654 1655 1656 1657 1658 1659 1660 |
if (!kprobe_disabled(p)) { /* Disable probe if it is a child probe */ if (p != orig_p) p->flags |= KPROBE_FLAG_DISABLED; /* Try to disarm and disable this/parent probe */ if (p == orig_p || aggr_kprobe_disabled(orig_p)) { |
69d54b916 kprobes: makes kp... |
1661 1662 1663 1664 1665 |
/* * If kprobes_all_disarmed is set, orig_p * should have already been disarmed, so * skip unneed disarming process. */ |
297f9233b kprobes: Propagat... |
1666 1667 1668 1669 1670 1671 1672 |
if (!kprobes_all_disarmed) { ret = disarm_kprobe(orig_p, true); if (ret) { p->flags &= ~KPROBE_FLAG_DISABLED; return ERR_PTR(ret); } } |
6f0f1dd71 kprobes: Cleanup ... |
1673 1674 1675 1676 1677 1678 |
orig_p->flags |= KPROBE_FLAG_DISABLED; } } return orig_p; } |
de5bd88d5 kprobes: support ... |
1679 1680 1681 |
/* * Unregister a kprobe without a scheduler synchronization. */ |
55479f647 kprobes: Allow pr... |
1682 |
static int __unregister_kprobe_top(struct kprobe *p) |
de5bd88d5 kprobes: support ... |
1683 |
{ |
6d8e40a85 kprobes: Rename o... |
1684 |
struct kprobe *ap, *list_p; |
de5bd88d5 kprobes: support ... |
1685 |
|
6f0f1dd71 kprobes: Cleanup ... |
1686 1687 |
/* Disable kprobe. This will disarm it if needed. */ ap = __disable_kprobe(p); |
297f9233b kprobes: Propagat... |
1688 1689 |
if (IS_ERR(ap)) return PTR_ERR(ap); |
de5bd88d5 kprobes: support ... |
1690 |
|
6f0f1dd71 kprobes: Cleanup ... |
1691 |
if (ap == p) |
bf8f6e5b3 Kprobes: The ON/O... |
1692 |
/* |
6f0f1dd71 kprobes: Cleanup ... |
1693 1694 |
* This probe is an independent(and non-optimized) kprobe * (not an aggrprobe). Remove from the hash list. |
bf8f6e5b3 Kprobes: The ON/O... |
1695 |
*/ |
6f0f1dd71 kprobes: Cleanup ... |
1696 1697 1698 1699 |
goto disarmed; /* Following process expects this probe is an aggrprobe */ WARN_ON(!kprobe_aggrprobe(ap)); |
6274de498 kprobes: Support ... |
1700 1701 1702 1703 1704 |
if (list_is_singular(&ap->list) && kprobe_disarmed(ap)) /* * !disarmed could be happen if the probe is under delayed * unoptimizing. */ |
6f0f1dd71 kprobes: Cleanup ... |
1705 1706 1707 |
goto disarmed; else { /* If disabling probe has special handlers, update aggrprobe */ |
e8386a0cb kprobes: support ... |
1708 |
if (p->post_handler && !kprobe_gone(p)) { |
6d8e40a85 kprobes: Rename o... |
1709 |
list_for_each_entry_rcu(list_p, &ap->list, list) { |
9861668f7 kprobes: add (un)... |
1710 1711 1712 |
if ((list_p != p) && (list_p->post_handler)) goto noclean; } |
6d8e40a85 kprobes: Rename o... |
1713 |
ap->post_handler = NULL; |
9861668f7 kprobes: add (un)... |
1714 1715 |
} noclean: |
6f0f1dd71 kprobes: Cleanup ... |
1716 1717 1718 1719 |
/* * Remove from the aggrprobe: this path will do nothing in * __unregister_kprobe_bottom(). */ |
49a2a1b83 [PATCH] kprobes: ... |
1720 |
list_del_rcu(&p->list); |
6f0f1dd71 kprobes: Cleanup ... |
1721 1722 1723 1724 1725 1726 |
if (!kprobe_disabled(ap) && !kprobes_all_disarmed) /* * Try to optimize this probe again, because post * handler may have been changed. */ optimize_kprobe(ap); |
49a2a1b83 [PATCH] kprobes: ... |
1727 |
} |
9861668f7 kprobes: add (un)... |
1728 |
return 0; |
6f0f1dd71 kprobes: Cleanup ... |
1729 1730 1731 1732 |
disarmed: hlist_del_rcu(&ap->hlist); return 0; |
9861668f7 kprobes: add (un)... |
1733 |
} |
3516a4604 [PATCH] Kprobes: ... |
1734 |
|
55479f647 kprobes: Allow pr... |
1735 |
static void __unregister_kprobe_bottom(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1736 |
{ |
6d8e40a85 kprobes: Rename o... |
1737 |
struct kprobe *ap; |
b3e55c727 [PATCH] Kprobes: ... |
1738 |
|
e8386a0cb kprobes: support ... |
1739 |
if (list_empty(&p->list)) |
6274de498 kprobes: Support ... |
1740 |
/* This is an independent kprobe */ |
0498b6350 [PATCH] kprobes: ... |
1741 |
arch_remove_kprobe(p); |
e8386a0cb kprobes: support ... |
1742 |
else if (list_is_singular(&p->list)) { |
6274de498 kprobes: Support ... |
1743 |
/* This is the last child of an aggrprobe */ |
6d8e40a85 kprobes: Rename o... |
1744 |
ap = list_entry(p->list.next, struct kprobe, list); |
e8386a0cb kprobes: support ... |
1745 |
list_del(&p->list); |
6d8e40a85 kprobes: Rename o... |
1746 |
free_aggr_kprobe(ap); |
9861668f7 kprobes: add (un)... |
1747 |
} |
6274de498 kprobes: Support ... |
1748 |
/* Otherwise, do nothing. */ |
9861668f7 kprobes: add (un)... |
1749 |
} |
55479f647 kprobes: Allow pr... |
1750 |
int register_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1751 1752 1753 1754 1755 1756 |
{ int i, ret = 0; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1757 |
ret = register_kprobe(kps[i]); |
67dddaad5 kprobes: fix erro... |
1758 1759 1760 |
if (ret < 0) { if (i > 0) unregister_kprobes(kps, i); |
9861668f7 kprobes: add (un)... |
1761 |
break; |
367216567 [PATCH] Kprobe: m... |
1762 |
} |
49a2a1b83 [PATCH] kprobes: ... |
1763 |
} |
9861668f7 kprobes: add (un)... |
1764 1765 |
return ret; } |
99081ab55 kprobes: move EXP... |
1766 |
EXPORT_SYMBOL_GPL(register_kprobes); |
9861668f7 kprobes: add (un)... |
1767 |
|
55479f647 kprobes: Allow pr... |
1768 |
void unregister_kprobe(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1769 1770 1771 |
{ unregister_kprobes(&p, 1); } |
99081ab55 kprobes: move EXP... |
1772 |
EXPORT_SYMBOL_GPL(unregister_kprobe); |
9861668f7 kprobes: add (un)... |
1773 |
|
55479f647 kprobes: Allow pr... |
1774 |
void unregister_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 |
{ int i; if (num <= 0) return; mutex_lock(&kprobe_mutex); for (i = 0; i < num; i++) if (__unregister_kprobe_top(kps[i]) < 0) kps[i]->addr = NULL; mutex_unlock(&kprobe_mutex); |
ae8b7ce76 kprobes: Replace ... |
1785 |
synchronize_rcu(); |
9861668f7 kprobes: add (un)... |
1786 1787 1788 |
for (i = 0; i < num; i++) if (kps[i]->addr) __unregister_kprobe_bottom(kps[i]); |
1da177e4c Linux-2.6.12-rc2 |
1789 |
} |
99081ab55 kprobes: move EXP... |
1790 |
EXPORT_SYMBOL_GPL(unregister_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
1791 |
|
5f6bee347 kprobes: Convert ... |
1792 1793 |
int __weak kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data) |
fc62d0207 kprobes: Introduc... |
1794 1795 1796 |
{ return NOTIFY_DONE; } |
5f6bee347 kprobes: Convert ... |
1797 |
NOKPROBE_SYMBOL(kprobe_exceptions_notify); |
fc62d0207 kprobes: Introduc... |
1798 |
|
1da177e4c Linux-2.6.12-rc2 |
1799 1800 |
static struct notifier_block kprobe_exceptions_nb = { .notifier_call = kprobe_exceptions_notify, |
3d5631e06 [PATCH] Kprobes r... |
1801 1802 |
.priority = 0x7fffffff /* we need to be notified first */ }; |
3d7e33825 jprobes: make jpr... |
1803 1804 1805 1806 |
unsigned long __weak arch_deref_entry_point(void *entry) { return (unsigned long)entry; } |
1da177e4c Linux-2.6.12-rc2 |
1807 |
|
9edddaa20 Kprobes: indicate... |
1808 |
#ifdef CONFIG_KRETPROBES |
e65cefe87 [PATCH] kernel/kp... |
1809 1810 1811 1812 |
/* * This kprobe pre_handler is registered with every kretprobe. When probe * hits it will set up the return probe. */ |
820aede02 kprobes: Use NOKP... |
1813 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
e65cefe87 [PATCH] kernel/kp... |
1814 1815 |
{ struct kretprobe *rp = container_of(p, struct kretprobe, kp); |
ef53d9c5e kprobes: improve ... |
1816 1817 |
unsigned long hash, flags = 0; struct kretprobe_instance *ri; |
e65cefe87 [PATCH] kernel/kp... |
1818 |
|
f96f56780 kprobes: Skip kre... |
1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 |
/* * To avoid deadlocks, prohibit return probing in NMI contexts, * just skip the probe and increase the (inexact) 'nmissed' * statistical counter, so that the user is informed that * something happened: */ if (unlikely(in_nmi())) { rp->nmissed++; return 0; } /* TODO: consider to only swap the RA after the last pre_handler fired */ |
ef53d9c5e kprobes: improve ... |
1831 |
hash = hash_ptr(current, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1832 |
raw_spin_lock_irqsave(&rp->lock, flags); |
4c4308cb9 kprobes: kretprob... |
1833 |
if (!hlist_empty(&rp->free_instances)) { |
4c4308cb9 kprobes: kretprob... |
1834 |
ri = hlist_entry(rp->free_instances.first, |
ef53d9c5e kprobes: improve ... |
1835 1836 |
struct kretprobe_instance, hlist); hlist_del(&ri->hlist); |
ec484608c locking, kprobes:... |
1837 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1838 |
|
4c4308cb9 kprobes: kretprob... |
1839 1840 |
ri->rp = rp; ri->task = current; |
f47cd9b55 kprobes: kretprob... |
1841 |
|
55ca6140e kprobes: fix a me... |
1842 1843 1844 1845 |
if (rp->entry_handler && rp->entry_handler(ri, regs)) { raw_spin_lock_irqsave(&rp->lock, flags); hlist_add_head(&ri->hlist, &rp->free_instances); raw_spin_unlock_irqrestore(&rp->lock, flags); |
f47cd9b55 kprobes: kretprob... |
1846 |
return 0; |
55ca6140e kprobes: fix a me... |
1847 |
} |
f47cd9b55 kprobes: kretprob... |
1848 |
|
4c4308cb9 kprobes: kretprob... |
1849 1850 1851 |
arch_prepare_kretprobe(ri, regs); /* XXX(hch): why is there no hlist_move_head? */ |
ef53d9c5e kprobes: improve ... |
1852 1853 1854 1855 1856 |
INIT_HLIST_NODE(&ri->hlist); kretprobe_table_lock(hash, &flags); hlist_add_head(&ri->hlist, &kretprobe_inst_table[hash]); kretprobe_table_unlock(hash, &flags); } else { |
4c4308cb9 kprobes: kretprob... |
1857 |
rp->nmissed++; |
ec484608c locking, kprobes:... |
1858 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1859 |
} |
e65cefe87 [PATCH] kernel/kp... |
1860 1861 |
return 0; } |
820aede02 kprobes: Use NOKP... |
1862 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
e65cefe87 [PATCH] kernel/kp... |
1863 |
|
659b957f2 kprobes: Rename [... |
1864 |
bool __weak arch_kprobe_on_func_entry(unsigned long offset) |
90ec5e89e kretprobes: Ensur... |
1865 1866 1867 |
{ return !offset; } |
659b957f2 kprobes: Rename [... |
1868 |
bool kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset) |
1d585e709 trace/kprobes: Fi... |
1869 1870 1871 1872 1873 1874 1875 |
{ kprobe_opcode_t *kp_addr = _kprobe_addr(addr, sym, offset); if (IS_ERR(kp_addr)) return false; if (!kallsyms_lookup_size_offset((unsigned long)kp_addr, NULL, &offset) || |
659b957f2 kprobes: Rename [... |
1876 |
!arch_kprobe_on_func_entry(offset)) |
1d585e709 trace/kprobes: Fi... |
1877 1878 1879 1880 |
return false; return true; } |
55479f647 kprobes: Allow pr... |
1881 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1882 1883 1884 1885 |
{ int ret = 0; struct kretprobe_instance *inst; int i; |
b2a5cd693 kprobes: fix a nu... |
1886 |
void *addr; |
90ec5e89e kretprobes: Ensur... |
1887 |
|
659b957f2 kprobes: Rename [... |
1888 |
if (!kprobe_on_func_entry(rp->kp.addr, rp->kp.symbol_name, rp->kp.offset)) |
90ec5e89e kretprobes: Ensur... |
1889 |
return -EINVAL; |
f438d914b kprobes: support ... |
1890 1891 |
if (kretprobe_blacklist_size) { |
b2a5cd693 kprobes: fix a nu... |
1892 |
addr = kprobe_addr(&rp->kp); |
bc81d48d1 kprobes: Return -... |
1893 1894 |
if (IS_ERR(addr)) return PTR_ERR(addr); |
f438d914b kprobes: support ... |
1895 1896 1897 1898 1899 1900 |
for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { if (kretprobe_blacklist[i].addr == addr) return -EINVAL; } } |
b94cce926 [PATCH] kprobes: ... |
1901 1902 |
rp->kp.pre_handler = pre_handler_kretprobe; |
7522a8423 [PATCH] kprobes: ... |
1903 1904 |
rp->kp.post_handler = NULL; rp->kp.fault_handler = NULL; |
b94cce926 [PATCH] kprobes: ... |
1905 1906 1907 |
/* Pre-allocate memory for max kretprobe instances */ if (rp->maxactive <= 0) { |
926166063 kprobes: Use CONF... |
1908 |
#ifdef CONFIG_PREEMPTION |
c2ef6661c kprobes: Fix dist... |
1909 |
rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus()); |
b94cce926 [PATCH] kprobes: ... |
1910 |
#else |
4dae560f9 kprobes: Sanitize... |
1911 |
rp->maxactive = num_possible_cpus(); |
b94cce926 [PATCH] kprobes: ... |
1912 1913 |
#endif } |
ec484608c locking, kprobes:... |
1914 |
raw_spin_lock_init(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1915 1916 |
INIT_HLIST_HEAD(&rp->free_instances); for (i = 0; i < rp->maxactive; i++) { |
f47cd9b55 kprobes: kretprob... |
1917 1918 |
inst = kmalloc(sizeof(struct kretprobe_instance) + rp->data_size, GFP_KERNEL); |
b94cce926 [PATCH] kprobes: ... |
1919 1920 1921 1922 |
if (inst == NULL) { free_rp_inst(rp); return -ENOMEM; } |
ef53d9c5e kprobes: improve ... |
1923 1924 |
INIT_HLIST_NODE(&inst->hlist); hlist_add_head(&inst->hlist, &rp->free_instances); |
b94cce926 [PATCH] kprobes: ... |
1925 1926 1927 1928 |
} rp->nmissed = 0; /* Establish function entry probe point */ |
49ad2fd76 kprobes: remove c... |
1929 |
ret = register_kprobe(&rp->kp); |
4a296e07c kprobes: add (un)... |
1930 |
if (ret != 0) |
b94cce926 [PATCH] kprobes: ... |
1931 1932 1933 |
free_rp_inst(rp); return ret; } |
99081ab55 kprobes: move EXP... |
1934 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1935 |
|
55479f647 kprobes: Allow pr... |
1936 |
int register_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1937 1938 1939 1940 1941 1942 |
{ int ret = 0, i; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1943 |
ret = register_kretprobe(rps[i]); |
67dddaad5 kprobes: fix erro... |
1944 1945 1946 |
if (ret < 0) { if (i > 0) unregister_kretprobes(rps, i); |
4a296e07c kprobes: add (un)... |
1947 1948 1949 1950 1951 |
break; } } return ret; } |
99081ab55 kprobes: move EXP... |
1952 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
4a296e07c kprobes: add (un)... |
1953 |
|
55479f647 kprobes: Allow pr... |
1954 |
void unregister_kretprobe(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1955 1956 1957 |
{ unregister_kretprobes(&rp, 1); } |
99081ab55 kprobes: move EXP... |
1958 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
4a296e07c kprobes: add (un)... |
1959 |
|
55479f647 kprobes: Allow pr... |
1960 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 |
{ int i; if (num <= 0) return; mutex_lock(&kprobe_mutex); for (i = 0; i < num; i++) if (__unregister_kprobe_top(&rps[i]->kp) < 0) rps[i]->kp.addr = NULL; mutex_unlock(&kprobe_mutex); |
ae8b7ce76 kprobes: Replace ... |
1971 |
synchronize_rcu(); |
4a296e07c kprobes: add (un)... |
1972 1973 1974 1975 1976 1977 1978 |
for (i = 0; i < num; i++) { if (rps[i]->kp.addr) { __unregister_kprobe_bottom(&rps[i]->kp); cleanup_rp_inst(rps[i]); } } } |
99081ab55 kprobes: move EXP... |
1979 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4a296e07c kprobes: add (un)... |
1980 |
|
9edddaa20 Kprobes: indicate... |
1981 |
#else /* CONFIG_KRETPROBES */ |
55479f647 kprobes: Allow pr... |
1982 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1983 1984 1985 |
{ return -ENOSYS; } |
99081ab55 kprobes: move EXP... |
1986 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1987 |
|
55479f647 kprobes: Allow pr... |
1988 |
int register_kretprobes(struct kretprobe **rps, int num) |
346fd59ba [PATCH] kprobes: ... |
1989 |
{ |
4a296e07c kprobes: add (un)... |
1990 |
return -ENOSYS; |
346fd59ba [PATCH] kprobes: ... |
1991 |
} |
99081ab55 kprobes: move EXP... |
1992 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
55479f647 kprobes: Allow pr... |
1993 |
void unregister_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1994 |
{ |
4a296e07c kprobes: add (un)... |
1995 |
} |
99081ab55 kprobes: move EXP... |
1996 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1997 |
|
55479f647 kprobes: Allow pr... |
1998 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1999 2000 |
{ } |
99081ab55 kprobes: move EXP... |
2001 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4c4308cb9 kprobes: kretprob... |
2002 |
|
820aede02 kprobes: Use NOKP... |
2003 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
4a296e07c kprobes: add (un)... |
2004 2005 |
{ return 0; |
b94cce926 [PATCH] kprobes: ... |
2006 |
} |
820aede02 kprobes: Use NOKP... |
2007 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
2008 |
|
4a296e07c kprobes: add (un)... |
2009 |
#endif /* CONFIG_KRETPROBES */ |
e8386a0cb kprobes: support ... |
2010 |
/* Set the kprobe gone and remove its instruction buffer. */ |
55479f647 kprobes: Allow pr... |
2011 |
static void kill_kprobe(struct kprobe *p) |
e8386a0cb kprobes: support ... |
2012 2013 |
{ struct kprobe *kp; |
de5bd88d5 kprobes: support ... |
2014 |
|
e7b219bc7 kprobes: fix kill... |
2015 2016 |
if (WARN_ON_ONCE(kprobe_gone(p))) return; |
e8386a0cb kprobes: support ... |
2017 |
p->flags |= KPROBE_FLAG_GONE; |
afd66255b kprobes: Introduc... |
2018 |
if (kprobe_aggrprobe(p)) { |
e8386a0cb kprobes: support ... |
2019 2020 2021 2022 2023 2024 2025 |
/* * If this is an aggr_kprobe, we have to list all the * chained probes and mark them GONE. */ list_for_each_entry_rcu(kp, &p->list, list) kp->flags |= KPROBE_FLAG_GONE; p->post_handler = NULL; |
afd66255b kprobes: Introduc... |
2026 |
kill_optimized_kprobe(p); |
e8386a0cb kprobes: support ... |
2027 2028 2029 2030 2031 2032 |
} /* * Here, we can remove insn_slot safely, because no thread calls * the original probed function (which will be freed soon) any more. */ arch_remove_kprobe(p); |
1424f0aa1 kprobes: Fix NULL... |
2033 2034 2035 |
/* * The module is going away. We should disarm the kprobe which |
3995f7a60 kprobes: Fix to c... |
2036 2037 |
* is using ftrace, because ftrace framework is still available at * MODULE_STATE_GOING notification. |
1424f0aa1 kprobes: Fix NULL... |
2038 |
*/ |
3995f7a60 kprobes: Fix to c... |
2039 |
if (kprobe_ftrace(p) && !kprobe_disabled(p) && !kprobes_all_disarmed) |
1424f0aa1 kprobes: Fix NULL... |
2040 |
disarm_kprobe_ftrace(p); |
e8386a0cb kprobes: support ... |
2041 |
} |
c0614829c kprobes: Move ena... |
2042 |
/* Disable one kprobe */ |
55479f647 kprobes: Allow pr... |
2043 |
int disable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
2044 2045 |
{ int ret = 0; |
297f9233b kprobes: Propagat... |
2046 |
struct kprobe *p; |
c0614829c kprobes: Move ena... |
2047 2048 |
mutex_lock(&kprobe_mutex); |
6f0f1dd71 kprobes: Cleanup ... |
2049 |
/* Disable this kprobe */ |
297f9233b kprobes: Propagat... |
2050 2051 2052 |
p = __disable_kprobe(kp); if (IS_ERR(p)) ret = PTR_ERR(p); |
c0614829c kprobes: Move ena... |
2053 |
|
c0614829c kprobes: Move ena... |
2054 2055 2056 2057 2058 2059 |
mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(disable_kprobe); /* Enable one kprobe */ |
55479f647 kprobes: Allow pr... |
2060 |
int enable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 |
{ int ret = 0; struct kprobe *p; mutex_lock(&kprobe_mutex); /* Check whether specified probe is valid. */ p = __get_valid_kprobe(kp); if (unlikely(p == NULL)) { ret = -EINVAL; goto out; } if (kprobe_gone(kp)) { /* This kprobe has gone, we couldn't enable it. */ ret = -EINVAL; goto out; } if (p != kp) kp->flags &= ~KPROBE_FLAG_DISABLED; if (!kprobes_all_disarmed && kprobe_disabled(p)) { p->flags &= ~KPROBE_FLAG_DISABLED; |
12310e343 kprobes: Propagat... |
2085 2086 2087 |
ret = arm_kprobe(p); if (ret) p->flags |= KPROBE_FLAG_DISABLED; |
c0614829c kprobes: Move ena... |
2088 2089 2090 2091 2092 2093 |
} out: mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(enable_kprobe); |
4458515b2 kprobes: Replace ... |
2094 |
/* Caller must NOT call this in usual path. This is only for critical case */ |
820aede02 kprobes: Use NOKP... |
2095 |
void dump_kprobe(struct kprobe *kp) |
24851d244 tracing/kprobes: ... |
2096 |
{ |
4458515b2 kprobes: Replace ... |
2097 2098 2099 2100 2101 2102 2103 |
pr_err("Dumping kprobe: "); pr_err("Name: %s Offset: %x Address: %pS ", kp->symbol_name, kp->offset, kp->addr); |
24851d244 tracing/kprobes: ... |
2104 |
} |
820aede02 kprobes: Use NOKP... |
2105 |
NOKPROBE_SYMBOL(dump_kprobe); |
24851d244 tracing/kprobes: ... |
2106 |
|
fb1a59fae kprobes: Blacklis... |
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 |
int kprobe_add_ksym_blacklist(unsigned long entry) { struct kprobe_blacklist_entry *ent; unsigned long offset = 0, size = 0; if (!kernel_text_address(entry) || !kallsyms_lookup_size_offset(entry, &size, &offset)) return -EINVAL; ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; ent->start_addr = entry; ent->end_addr = entry + size; INIT_LIST_HEAD(&ent->list); list_add_tail(&ent->list, &kprobe_blacklist); return (int)size; } /* Add all symbols in given area into kprobe blacklist */ int kprobe_add_area_blacklist(unsigned long start, unsigned long end) { unsigned long entry; int ret = 0; for (entry = start; entry < end; entry += ret) { ret = kprobe_add_ksym_blacklist(entry); if (ret < 0) return ret; if (ret == 0) /* In case of alias symbol */ ret = 1; } return 0; } int __init __weak arch_populate_kprobe_blacklist(void) { return 0; } |
376e24242 kprobes: Introduc... |
2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 |
/* * Lookup and populate the kprobe_blacklist. * * Unlike the kretprobe blacklist, we'll need to determine * the range of addresses that belong to the said functions, * since a kprobe need not necessarily be at the beginning * of a function. */ static int __init populate_kprobe_blacklist(unsigned long *start, unsigned long *end) { |
fb1a59fae kprobes: Blacklis... |
2158 |
unsigned long entry; |
376e24242 kprobes: Introduc... |
2159 |
unsigned long *iter; |
fb1a59fae kprobes: Blacklis... |
2160 |
int ret; |
376e24242 kprobes: Introduc... |
2161 2162 |
for (iter = start; iter < end; iter++) { |
d81b4253b kprobes: Fix "Fai... |
2163 |
entry = arch_deref_entry_point((void *)*iter); |
fb1a59fae kprobes: Blacklis... |
2164 2165 |
ret = kprobe_add_ksym_blacklist(entry); if (ret == -EINVAL) |
376e24242 kprobes: Introduc... |
2166 |
continue; |
fb1a59fae kprobes: Blacklis... |
2167 2168 |
if (ret < 0) return ret; |
376e24242 kprobes: Introduc... |
2169 |
} |
fb1a59fae kprobes: Blacklis... |
2170 2171 2172 2173 2174 2175 |
/* Symbols in __kprobes_text are blacklisted */ ret = kprobe_add_area_blacklist((unsigned long)__kprobes_text_start, (unsigned long)__kprobes_text_end); return ret ? : arch_populate_kprobe_blacklist(); |
376e24242 kprobes: Introduc... |
2176 |
} |
e8386a0cb kprobes: support ... |
2177 |
/* Module notifier call back, checking kprobes on the module */ |
55479f647 kprobes: Allow pr... |
2178 2179 |
static int kprobes_module_callback(struct notifier_block *nb, unsigned long val, void *data) |
e8386a0cb kprobes: support ... |
2180 2181 2182 |
{ struct module *mod = data; struct hlist_head *head; |
e8386a0cb kprobes: support ... |
2183 2184 |
struct kprobe *p; unsigned int i; |
f24659d96 kprobes: support ... |
2185 |
int checkcore = (val == MODULE_STATE_GOING); |
e8386a0cb kprobes: support ... |
2186 |
|
f24659d96 kprobes: support ... |
2187 |
if (val != MODULE_STATE_GOING && val != MODULE_STATE_LIVE) |
e8386a0cb kprobes: support ... |
2188 2189 2190 |
return NOTIFY_DONE; /* |
f24659d96 kprobes: support ... |
2191 2192 2193 2194 |
* When MODULE_STATE_GOING was notified, both of module .text and * .init.text sections would be freed. When MODULE_STATE_LIVE was * notified, only .init.text section would be freed. We need to * disable kprobes which have been inserted in the sections. |
e8386a0cb kprobes: support ... |
2195 2196 2197 2198 |
*/ mutex_lock(&kprobe_mutex); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
e7b219bc7 kprobes: fix kill... |
2199 2200 2201 |
hlist_for_each_entry_rcu(p, head, hlist) { if (kprobe_gone(p)) continue; |
f24659d96 kprobes: support ... |
2202 2203 2204 |
if (within_module_init((unsigned long)p->addr, mod) || (checkcore && within_module_core((unsigned long)p->addr, mod))) { |
e8386a0cb kprobes: support ... |
2205 2206 2207 2208 |
/* * The vaddr this probe is installed will soon * be vfreed buy not synced to disk. Hence, * disarming the breakpoint isn't needed. |
545a02819 kprobes: Document... |
2209 2210 2211 2212 2213 2214 |
* * Note, this will also move any optimized probes * that are pending to be removed from their * corresponding lists to the freeing_list and * will not be touched by the delayed * kprobe_optimizer work handler. |
e8386a0cb kprobes: support ... |
2215 2216 2217 |
*/ kill_kprobe(p); } |
e7b219bc7 kprobes: fix kill... |
2218 |
} |
e8386a0cb kprobes: support ... |
2219 2220 2221 2222 2223 2224 2225 2226 2227 |
} mutex_unlock(&kprobe_mutex); return NOTIFY_DONE; } static struct notifier_block kprobe_module_nb = { .notifier_call = kprobes_module_callback, .priority = 0 }; |
376e24242 kprobes: Introduc... |
2228 2229 2230 |
/* Markers of _kprobe_blacklist section */ extern unsigned long __start_kprobe_blacklist[]; extern unsigned long __stop_kprobe_blacklist[]; |
c4ab0a837 kprobes: tracing/... |
2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 |
void kprobe_free_init_mem(void) { void *start = (void *)(&__init_begin); void *end = (void *)(&__init_end); struct hlist_head *head; struct kprobe *p; int i; mutex_lock(&kprobe_mutex); /* Kill all kprobes on initmem */ for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; hlist_for_each_entry(p, head, hlist) { if (start <= (void *)p->addr && (void *)p->addr < end) kill_kprobe(p); } } mutex_unlock(&kprobe_mutex); } |
1da177e4c Linux-2.6.12-rc2 |
2252 2253 2254 2255 2256 2257 |
static int __init init_kprobes(void) { int i, err = 0; /* FIXME allocate the probe table, currently defined statically */ /* initialize all list heads */ |
b94cce926 [PATCH] kprobes: ... |
2258 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { |
1da177e4c Linux-2.6.12-rc2 |
2259 |
INIT_HLIST_HEAD(&kprobe_table[i]); |
b94cce926 [PATCH] kprobes: ... |
2260 |
INIT_HLIST_HEAD(&kretprobe_inst_table[i]); |
ec484608c locking, kprobes:... |
2261 |
raw_spin_lock_init(&(kretprobe_table_locks[i].lock)); |
b94cce926 [PATCH] kprobes: ... |
2262 |
} |
1da177e4c Linux-2.6.12-rc2 |
2263 |
|
376e24242 kprobes: Introduc... |
2264 2265 2266 2267 2268 2269 2270 |
err = populate_kprobe_blacklist(__start_kprobe_blacklist, __stop_kprobe_blacklist); if (err) { pr_err("kprobes: failed to populate blacklist: %d ", err); pr_err("Please take care of using kprobes. "); |
3d8d996e0 kprobes: prevent ... |
2271 |
} |
f438d914b kprobes: support ... |
2272 2273 2274 |
if (kretprobe_blacklist_size) { /* lookup the function address from its name */ for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { |
49e0b4658 kprobes: Convert ... |
2275 |
kretprobe_blacklist[i].addr = |
290e30707 powerpc/kprobes: ... |
2276 |
kprobe_lookup_name(kretprobe_blacklist[i].name, 0); |
f438d914b kprobes: support ... |
2277 2278 2279 2280 2281 2282 |
if (!kretprobe_blacklist[i].addr) printk("kretprobe: lookup failed: %s ", kretprobe_blacklist[i].name); } } |
b2be84df9 kprobes: Jump opt... |
2283 2284 |
#if defined(CONFIG_OPTPROBES) #if defined(__ARCH_WANT_KPROBES_INSN_SLOT) |
afd66255b kprobes: Introduc... |
2285 2286 2287 |
/* Init kprobe_optinsn_slots */ kprobe_optinsn_slots.insn_size = MAX_OPTINSN_SIZE; #endif |
b2be84df9 kprobes: Jump opt... |
2288 2289 2290 |
/* By default, kprobes can be optimized */ kprobes_allow_optimization = true; #endif |
afd66255b kprobes: Introduc... |
2291 |
|
e579abeb5 kprobes: rename k... |
2292 2293 |
/* By default, kprobes are armed */ kprobes_all_disarmed = false; |
bf8f6e5b3 Kprobes: The ON/O... |
2294 |
|
6772926be [PATCH] kprobes: ... |
2295 |
err = arch_init_kprobes(); |
802eae7c8 [PATCH] Return pr... |
2296 2297 |
if (!err) err = register_die_notifier(&kprobe_exceptions_nb); |
e8386a0cb kprobes: support ... |
2298 2299 |
if (!err) err = register_module_notifier(&kprobe_module_nb); |
ef53d9c5e kprobes: improve ... |
2300 |
kprobes_initialized = (err == 0); |
802eae7c8 [PATCH] Return pr... |
2301 |
|
8c1c93564 x86: kprobes: add... |
2302 2303 |
if (!err) init_test_probes(); |
1da177e4c Linux-2.6.12-rc2 |
2304 2305 |
return err; } |
65fc965c7 kprobes: Fix to i... |
2306 |
subsys_initcall(init_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
2307 |
|
346fd59ba [PATCH] kprobes: ... |
2308 |
#ifdef CONFIG_DEBUG_FS |
55479f647 kprobes: Allow pr... |
2309 |
static void report_probe(struct seq_file *pi, struct kprobe *p, |
afd66255b kprobes: Introduc... |
2310 |
const char *sym, int offset, char *modname, struct kprobe *pp) |
346fd59ba [PATCH] kprobes: ... |
2311 2312 |
{ char *kprobe_type; |
81365a947 kprobes: Show add... |
2313 |
void *addr = p->addr; |
346fd59ba [PATCH] kprobes: ... |
2314 2315 2316 |
if (p->pre_handler == pre_handler_kretprobe) kprobe_type = "r"; |
346fd59ba [PATCH] kprobes: ... |
2317 2318 |
else kprobe_type = "k"; |
afd66255b kprobes: Introduc... |
2319 |
|
e5541c634 kprobes: Do not e... |
2320 |
if (!kallsyms_show_value(pi->file->f_cred)) |
81365a947 kprobes: Show add... |
2321 |
addr = NULL; |
346fd59ba [PATCH] kprobes: ... |
2322 |
if (sym) |
81365a947 kprobes: Show add... |
2323 2324 |
seq_printf(pi, "%px %s %s+0x%x %s ", addr, kprobe_type, sym, offset, |
afd66255b kprobes: Introduc... |
2325 |
(modname ? modname : " ")); |
81365a947 kprobes: Show add... |
2326 2327 2328 |
else /* try to use %pS */ seq_printf(pi, "%px %s %pS ", addr, kprobe_type, p->addr); |
afd66255b kprobes: Introduc... |
2329 2330 2331 |
if (!pp) pp = p; |
ae6aa16fd kprobes: introduc... |
2332 2333 |
seq_printf(pi, "%s%s%s%s ", |
afd66255b kprobes: Introduc... |
2334 2335 |
(kprobe_gone(p) ? "[GONE]" : ""), ((kprobe_disabled(p) && !kprobe_gone(p)) ? "[DISABLED]" : ""), |
ae6aa16fd kprobes: introduc... |
2336 2337 |
(kprobe_optimized(pp) ? "[OPTIMIZED]" : ""), (kprobe_ftrace(pp) ? "[FTRACE]" : "")); |
346fd59ba [PATCH] kprobes: ... |
2338 |
} |
55479f647 kprobes: Allow pr... |
2339 |
static void *kprobe_seq_start(struct seq_file *f, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2340 2341 2342 |
{ return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL; } |
55479f647 kprobes: Allow pr... |
2343 |
static void *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2344 2345 2346 2347 2348 2349 |
{ (*pos)++; if (*pos >= KPROBE_TABLE_SIZE) return NULL; return pos; } |
55479f647 kprobes: Allow pr... |
2350 |
static void kprobe_seq_stop(struct seq_file *f, void *v) |
346fd59ba [PATCH] kprobes: ... |
2351 2352 2353 |
{ /* Nothing to do */ } |
55479f647 kprobes: Allow pr... |
2354 |
static int show_kprobe_addr(struct seq_file *pi, void *v) |
346fd59ba [PATCH] kprobes: ... |
2355 2356 |
{ struct hlist_head *head; |
346fd59ba [PATCH] kprobes: ... |
2357 2358 2359 |
struct kprobe *p, *kp; const char *sym = NULL; unsigned int i = *(loff_t *) v; |
ffb451227 Simplify kallsyms... |
2360 |
unsigned long offset = 0; |
ab7678656 kprobes: use KSYM... |
2361 |
char *modname, namebuf[KSYM_NAME_LEN]; |
346fd59ba [PATCH] kprobes: ... |
2362 2363 2364 |
head = &kprobe_table[i]; preempt_disable(); |
b67bfe0d4 hlist: drop the n... |
2365 |
hlist_for_each_entry_rcu(p, head, hlist) { |
ffb451227 Simplify kallsyms... |
2366 |
sym = kallsyms_lookup((unsigned long)p->addr, NULL, |
346fd59ba [PATCH] kprobes: ... |
2367 |
&offset, &modname, namebuf); |
afd66255b kprobes: Introduc... |
2368 |
if (kprobe_aggrprobe(p)) { |
346fd59ba [PATCH] kprobes: ... |
2369 |
list_for_each_entry_rcu(kp, &p->list, list) |
afd66255b kprobes: Introduc... |
2370 |
report_probe(pi, kp, sym, offset, modname, p); |
346fd59ba [PATCH] kprobes: ... |
2371 |
} else |
afd66255b kprobes: Introduc... |
2372 |
report_probe(pi, p, sym, offset, modname, NULL); |
346fd59ba [PATCH] kprobes: ... |
2373 2374 2375 2376 |
} preempt_enable(); return 0; } |
88e9d34c7 seq_file: constif... |
2377 |
static const struct seq_operations kprobes_seq_ops = { |
346fd59ba [PATCH] kprobes: ... |
2378 2379 2380 2381 2382 |
.start = kprobe_seq_start, .next = kprobe_seq_next, .stop = kprobe_seq_stop, .show = show_kprobe_addr }; |
55479f647 kprobes: Allow pr... |
2383 |
static int kprobes_open(struct inode *inode, struct file *filp) |
346fd59ba [PATCH] kprobes: ... |
2384 2385 2386 |
{ return seq_open(filp, &kprobes_seq_ops); } |
828c09509 const: constify r... |
2387 |
static const struct file_operations debugfs_kprobes_operations = { |
346fd59ba [PATCH] kprobes: ... |
2388 2389 2390 2391 2392 |
.open = kprobes_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
637247403 kprobes: Show bla... |
2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 |
/* kprobes/blacklist -- shows which functions can not be probed */ static void *kprobe_blacklist_seq_start(struct seq_file *m, loff_t *pos) { return seq_list_start(&kprobe_blacklist, *pos); } static void *kprobe_blacklist_seq_next(struct seq_file *m, void *v, loff_t *pos) { return seq_list_next(v, &kprobe_blacklist, pos); } static int kprobe_blacklist_seq_show(struct seq_file *m, void *v) { struct kprobe_blacklist_entry *ent = list_entry(v, struct kprobe_blacklist_entry, list); |
ffb9bd68e kprobes: Show bla... |
2408 2409 2410 2411 |
/* * If /proc/kallsyms is not showing kernel address, we won't * show them here either. */ |
e5541c634 kprobes: Do not e... |
2412 |
if (!kallsyms_show_value(m->file->f_cred)) |
ffb9bd68e kprobes: Show bla... |
2413 2414 2415 2416 2417 2418 2419 |
seq_printf(m, "0x%px-0x%px\t%ps ", NULL, NULL, (void *)ent->start_addr); else seq_printf(m, "0x%px-0x%px\t%ps ", (void *)ent->start_addr, (void *)ent->end_addr, (void *)ent->start_addr); |
637247403 kprobes: Show bla... |
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 |
return 0; } static const struct seq_operations kprobe_blacklist_seq_ops = { .start = kprobe_blacklist_seq_start, .next = kprobe_blacklist_seq_next, .stop = kprobe_seq_stop, /* Reuse void function */ .show = kprobe_blacklist_seq_show, }; static int kprobe_blacklist_open(struct inode *inode, struct file *filp) { return seq_open(filp, &kprobe_blacklist_seq_ops); } static const struct file_operations debugfs_kprobe_blacklist_ops = { .open = kprobe_blacklist_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
12310e343 kprobes: Propagat... |
2441 |
static int arm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2442 2443 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2444 |
struct kprobe *p; |
12310e343 kprobes: Propagat... |
2445 2446 |
unsigned int i, total = 0, errors = 0; int err, ret = 0; |
bf8f6e5b3 Kprobes: The ON/O... |
2447 2448 |
mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2449 2450 |
/* If kprobes are armed, just return */ if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2451 |
goto already_enabled; |
977ad481b kprobes: set kpro... |
2452 2453 2454 2455 2456 2457 |
/* * optimize_kprobe() called by arm_kprobe() checks * kprobes_all_disarmed, so set kprobes_all_disarmed before * arm_kprobe. */ kprobes_all_disarmed = false; |
afd66255b kprobes: Introduc... |
2458 |
/* Arming kprobes doesn't optimize kprobe itself */ |
bf8f6e5b3 Kprobes: The ON/O... |
2459 2460 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
12310e343 kprobes: Propagat... |
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 |
/* Arm all kprobes on a best-effort basis */ hlist_for_each_entry_rcu(p, head, hlist) { if (!kprobe_disabled(p)) { err = arm_kprobe(p); if (err) { errors++; ret = err; } total++; } } |
bf8f6e5b3 Kprobes: The ON/O... |
2472 |
} |
12310e343 kprobes: Propagat... |
2473 2474 2475 2476 2477 2478 2479 |
if (errors) pr_warn("Kprobes globally enabled, but failed to arm %d out of %d probes ", errors, total); else pr_info("Kprobes globally enabled "); |
bf8f6e5b3 Kprobes: The ON/O... |
2480 2481 2482 |
already_enabled: mutex_unlock(&kprobe_mutex); |
12310e343 kprobes: Propagat... |
2483 |
return ret; |
bf8f6e5b3 Kprobes: The ON/O... |
2484 |
} |
297f9233b kprobes: Propagat... |
2485 |
static int disarm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2486 2487 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2488 |
struct kprobe *p; |
297f9233b kprobes: Propagat... |
2489 2490 |
unsigned int i, total = 0, errors = 0; int err, ret = 0; |
bf8f6e5b3 Kprobes: The ON/O... |
2491 2492 |
mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2493 |
/* If kprobes are already disarmed, just return */ |
6274de498 kprobes: Support ... |
2494 2495 |
if (kprobes_all_disarmed) { mutex_unlock(&kprobe_mutex); |
297f9233b kprobes: Propagat... |
2496 |
return 0; |
6274de498 kprobes: Support ... |
2497 |
} |
bf8f6e5b3 Kprobes: The ON/O... |
2498 |
|
e579abeb5 kprobes: rename k... |
2499 |
kprobes_all_disarmed = true; |
afd66255b kprobes: Introduc... |
2500 |
|
bf8f6e5b3 Kprobes: The ON/O... |
2501 2502 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
297f9233b kprobes: Propagat... |
2503 |
/* Disarm all kprobes on a best-effort basis */ |
b67bfe0d4 hlist: drop the n... |
2504 |
hlist_for_each_entry_rcu(p, head, hlist) { |
297f9233b kprobes: Propagat... |
2505 2506 2507 2508 2509 2510 2511 2512 |
if (!arch_trampoline_kprobe(p) && !kprobe_disabled(p)) { err = disarm_kprobe(p, false); if (err) { errors++; ret = err; } total++; } |
bf8f6e5b3 Kprobes: The ON/O... |
2513 2514 |
} } |
297f9233b kprobes: Propagat... |
2515 2516 2517 2518 2519 2520 2521 2522 |
if (errors) pr_warn("Kprobes globally disabled, but failed to disarm %d out of %d probes ", errors, total); else pr_info("Kprobes globally disabled "); |
bf8f6e5b3 Kprobes: The ON/O... |
2523 |
mutex_unlock(&kprobe_mutex); |
bf8f6e5b3 Kprobes: The ON/O... |
2524 |
|
6274de498 kprobes: Support ... |
2525 2526 |
/* Wait for disarming all kprobes by optimizer */ wait_for_kprobe_optimizer(); |
297f9233b kprobes: Propagat... |
2527 2528 |
return ret; |
bf8f6e5b3 Kprobes: The ON/O... |
2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 |
} /* * XXX: The debugfs bool file interface doesn't allow for callbacks * when the bool state is switched. We can reuse that facility when * available */ static ssize_t read_enabled_file_bool(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { char buf[3]; |
e579abeb5 kprobes: rename k... |
2540 |
if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 |
buf[0] = '1'; else buf[0] = '0'; buf[1] = ' '; buf[2] = 0x00; return simple_read_from_buffer(user_buf, count, ppos, buf, 2); } static ssize_t write_enabled_file_bool(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { char buf[32]; |
efeb156e7 kprobes: silence ... |
2554 |
size_t buf_size; |
12310e343 kprobes: Propagat... |
2555 |
int ret = 0; |
bf8f6e5b3 Kprobes: The ON/O... |
2556 2557 2558 2559 |
buf_size = min(count, (sizeof(buf)-1)); if (copy_from_user(buf, user_buf, buf_size)) return -EFAULT; |
10fb46d5f kprobes: handle e... |
2560 |
buf[buf_size] = '\0'; |
bf8f6e5b3 Kprobes: The ON/O... |
2561 2562 2563 2564 |
switch (buf[0]) { case 'y': case 'Y': case '1': |
12310e343 kprobes: Propagat... |
2565 |
ret = arm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2566 2567 2568 2569 |
break; case 'n': case 'N': case '0': |
297f9233b kprobes: Propagat... |
2570 |
ret = disarm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2571 |
break; |
10fb46d5f kprobes: handle e... |
2572 2573 |
default: return -EINVAL; |
bf8f6e5b3 Kprobes: The ON/O... |
2574 |
} |
12310e343 kprobes: Propagat... |
2575 2576 |
if (ret) return ret; |
bf8f6e5b3 Kprobes: The ON/O... |
2577 2578 |
return count; } |
828c09509 const: constify r... |
2579 |
static const struct file_operations fops_kp = { |
bf8f6e5b3 Kprobes: The ON/O... |
2580 2581 |
.read = read_enabled_file_bool, .write = write_enabled_file_bool, |
6038f373a llseek: automatic... |
2582 |
.llseek = default_llseek, |
bf8f6e5b3 Kprobes: The ON/O... |
2583 |
}; |
55479f647 kprobes: Allow pr... |
2584 |
static int __init debugfs_kprobe_init(void) |
346fd59ba [PATCH] kprobes: ... |
2585 |
{ |
8c0fd1fa6 kprobes: no need ... |
2586 |
struct dentry *dir; |
bf8f6e5b3 Kprobes: The ON/O... |
2587 |
unsigned int value = 1; |
346fd59ba [PATCH] kprobes: ... |
2588 2589 |
dir = debugfs_create_dir("kprobes", NULL); |
346fd59ba [PATCH] kprobes: ... |
2590 |
|
8c0fd1fa6 kprobes: no need ... |
2591 2592 |
debugfs_create_file("list", 0400, dir, NULL, &debugfs_kprobes_operations); |
346fd59ba [PATCH] kprobes: ... |
2593 |
|
8c0fd1fa6 kprobes: no need ... |
2594 |
debugfs_create_file("enabled", 0600, dir, &value, &fops_kp); |
637247403 kprobes: Show bla... |
2595 |
|
8c0fd1fa6 kprobes: no need ... |
2596 2597 |
debugfs_create_file("blacklist", 0400, dir, NULL, &debugfs_kprobe_blacklist_ops); |
bf8f6e5b3 Kprobes: The ON/O... |
2598 |
|
346fd59ba [PATCH] kprobes: ... |
2599 2600 2601 2602 2603 |
return 0; } late_initcall(debugfs_kprobe_init); #endif /* CONFIG_DEBUG_FS */ |