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kernel/kprobes.c
63 KB
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/* * Kernel Probes (KProbes) * kernel/kprobes.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * 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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static void *alloc_insn_page(void) { 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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|
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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 */ synchronize_sched(); |
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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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/* * 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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/* 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) { |
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if (p->addr == addr) return p; } |
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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); kp->pre_handler(kp, regs); } reset_kprobe_instance(); } } |
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NOKPROBE_SYMBOL(opt_pre_handler); |
afd66255b kprobes: Introduc... |
379 |
|
6274de498 kprobes: Support ... |
380 |
/* Free optimized instructions and optimized_kprobe */ |
55479f647 kprobes: Allow pr... |
381 |
static void free_aggr_kprobe(struct kprobe *p) |
6274de498 kprobes: Support ... |
382 383 384 385 386 387 388 389 |
{ 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... |
390 391 392 393 394 395 396 397 398 399 400 401 |
/* 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 ... |
402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 |
/* 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... |
417 |
static int kprobe_queued(struct kprobe *p) |
6274de498 kprobes: Support ... |
418 419 420 421 422 423 424 425 426 427 |
{ 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... |
428 429 430 431 |
/* * Return an optimized kprobe whose optimizing code replaces * instructions including addr (exclude breakpoint). */ |
55479f647 kprobes: Allow pr... |
432 |
static struct kprobe *get_optimized_kprobe(unsigned long addr) |
afd66255b kprobes: Introduc... |
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 |
{ 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 ... |
453 |
static LIST_HEAD(unoptimizing_list); |
7b959fc58 kprobes: Fix to f... |
454 |
static LIST_HEAD(freeing_list); |
afd66255b kprobes: Introduc... |
455 456 457 458 |
static void kprobe_optimizer(struct work_struct *work); static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer); #define OPTIMIZE_DELAY 5 |
61f4e13ff kprobes: Separate... |
459 460 461 462 |
/* * Optimize (replace a breakpoint with a jump) kprobes listed on * optimizing_list. */ |
55479f647 kprobes: Allow pr... |
463 |
static void do_optimize_kprobes(void) |
afd66255b kprobes: Introduc... |
464 |
{ |
afd66255b kprobes: Introduc... |
465 466 467 468 469 470 471 |
/* * 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... |
472 |
* To avoid this deadlock, caller must have locked cpu hotplug |
afd66255b kprobes: Introduc... |
473 474 |
* for preventing cpu-hotplug outside of text_mutex locking. */ |
2d1e38f56 kprobes: Cure hot... |
475 476 477 478 479 480 |
lockdep_assert_cpus_held(); /* Optimization never be done when disarmed */ if (kprobes_all_disarmed || !kprobes_allow_optimization || list_empty(&optimizing_list)) return; |
afd66255b kprobes: Introduc... |
481 |
mutex_lock(&text_mutex); |
cd7ebe229 kprobes: Use text... |
482 |
arch_optimize_kprobes(&optimizing_list); |
afd66255b kprobes: Introduc... |
483 |
mutex_unlock(&text_mutex); |
61f4e13ff kprobes: Separate... |
484 |
} |
6274de498 kprobes: Support ... |
485 486 487 488 |
/* * Unoptimize (replace a jump with a breakpoint and remove the breakpoint * if need) kprobes listed on unoptimizing_list. */ |
55479f647 kprobes: Allow pr... |
489 |
static void do_unoptimize_kprobes(void) |
6274de498 kprobes: Support ... |
490 491 |
{ struct optimized_kprobe *op, *tmp; |
2d1e38f56 kprobes: Cure hot... |
492 493 |
/* See comment in do_optimize_kprobes() */ lockdep_assert_cpus_held(); |
6274de498 kprobes: Support ... |
494 495 496 |
/* Unoptimization must be done anytime */ if (list_empty(&unoptimizing_list)) return; |
6274de498 kprobes: Support ... |
497 |
mutex_lock(&text_mutex); |
7b959fc58 kprobes: Fix to f... |
498 |
arch_unoptimize_kprobes(&unoptimizing_list, &freeing_list); |
f984ba4eb kprobes: Use text... |
499 |
/* Loop free_list for disarming */ |
7b959fc58 kprobes: Fix to f... |
500 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
6274de498 kprobes: Support ... |
501 502 503 504 505 506 507 508 509 510 |
/* 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 ... |
511 512 513 514 |
} else list_del_init(&op->list); } mutex_unlock(&text_mutex); |
6274de498 kprobes: Support ... |
515 516 517 |
} /* Reclaim all kprobes on the free_list */ |
55479f647 kprobes: Allow pr... |
518 |
static void do_free_cleaned_kprobes(void) |
6274de498 kprobes: Support ... |
519 520 |
{ struct optimized_kprobe *op, *tmp; |
7b959fc58 kprobes: Fix to f... |
521 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
6274de498 kprobes: Support ... |
522 523 524 525 526 527 528 |
BUG_ON(!kprobe_unused(&op->kp)); list_del_init(&op->list); free_aggr_kprobe(&op->kp); } } /* Start optimizer after OPTIMIZE_DELAY passed */ |
55479f647 kprobes: Allow pr... |
529 |
static void kick_kprobe_optimizer(void) |
6274de498 kprobes: Support ... |
530 |
{ |
ad72b3bea kprobes: fix wait... |
531 |
schedule_delayed_work(&optimizing_work, OPTIMIZE_DELAY); |
6274de498 kprobes: Support ... |
532 |
} |
61f4e13ff kprobes: Separate... |
533 |
/* Kprobe jump optimizer */ |
55479f647 kprobes: Allow pr... |
534 |
static void kprobe_optimizer(struct work_struct *work) |
61f4e13ff kprobes: Separate... |
535 |
{ |
72ef3794c kprobes: Inverse ... |
536 |
mutex_lock(&kprobe_mutex); |
2d1e38f56 kprobes: Cure hot... |
537 |
cpus_read_lock(); |
61f4e13ff kprobes: Separate... |
538 539 |
/* Lock modules while optimizing kprobes */ mutex_lock(&module_mutex); |
61f4e13ff kprobes: Separate... |
540 541 |
/* |
6274de498 kprobes: Support ... |
542 543 544 |
* Step 1: Unoptimize kprobes and collect cleaned (unused and disarmed) * kprobes before waiting for quiesence period. */ |
7b959fc58 kprobes: Fix to f... |
545 |
do_unoptimize_kprobes(); |
6274de498 kprobes: Support ... |
546 547 |
/* |
5715de464 kprobes: Use sync... |
548 549 550 551 552 553 554 |
* 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... |
555 |
*/ |
5715de464 kprobes: Use sync... |
556 |
synchronize_rcu_tasks(); |
61f4e13ff kprobes: Separate... |
557 |
|
6274de498 kprobes: Support ... |
558 |
/* Step 3: Optimize kprobes after quiesence period */ |
61f4e13ff kprobes: Separate... |
559 |
do_optimize_kprobes(); |
6274de498 kprobes: Support ... |
560 561 |
/* Step 4: Free cleaned kprobes after quiesence period */ |
7b959fc58 kprobes: Fix to f... |
562 |
do_free_cleaned_kprobes(); |
6274de498 kprobes: Support ... |
563 |
|
afd66255b kprobes: Introduc... |
564 |
mutex_unlock(&module_mutex); |
2d1e38f56 kprobes: Cure hot... |
565 |
cpus_read_unlock(); |
72ef3794c kprobes: Inverse ... |
566 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
567 |
|
cd7ebe229 kprobes: Use text... |
568 |
/* Step 5: Kick optimizer again if needed */ |
f984ba4eb kprobes: Use text... |
569 |
if (!list_empty(&optimizing_list) || !list_empty(&unoptimizing_list)) |
cd7ebe229 kprobes: Use text... |
570 |
kick_kprobe_optimizer(); |
6274de498 kprobes: Support ... |
571 572 573 |
} /* Wait for completing optimization and unoptimization */ |
30e7d894c tracing/kprobes: ... |
574 |
void wait_for_kprobe_optimizer(void) |
6274de498 kprobes: Support ... |
575 |
{ |
ad72b3bea kprobes: fix wait... |
576 577 578 579 580 581 582 583 584 585 586 587 588 589 |
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... |
590 591 592 |
} /* Optimize kprobe if p is ready to be optimized */ |
55479f647 kprobes: Allow pr... |
593 |
static void optimize_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
594 595 596 597 |
{ struct optimized_kprobe *op; /* Check if the kprobe is disabled or not ready for optimization. */ |
b2be84df9 kprobes: Jump opt... |
598 |
if (!kprobe_optready(p) || !kprobes_allow_optimization || |
afd66255b kprobes: Introduc... |
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 |
(kprobe_disabled(p) || kprobes_all_disarmed)) return; /* Both of break_handler and post_handler are not supported. */ if (p->break_handler || p->post_handler) 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. */ if (op->kp.flags & KPROBE_FLAG_OPTIMIZED) return; |
afd66255b kprobes: Introduc... |
615 |
op->kp.flags |= KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
616 617 618 619 620 621 622 623 624 625 626 |
if (!list_empty(&op->list)) /* This is under unoptimizing. Just dequeue the probe */ list_del_init(&op->list); else { list_add(&op->list, &optimizing_list); kick_kprobe_optimizer(); } } /* Short cut to direct unoptimizing */ |
55479f647 kprobes: Allow pr... |
627 |
static void force_unoptimize_kprobe(struct optimized_kprobe *op) |
6274de498 kprobes: Support ... |
628 |
{ |
2d1e38f56 kprobes: Cure hot... |
629 |
lockdep_assert_cpus_held(); |
6274de498 kprobes: Support ... |
630 |
arch_unoptimize_kprobe(op); |
6274de498 kprobes: Support ... |
631 632 |
if (kprobe_disabled(&op->kp)) arch_disarm_kprobe(&op->kp); |
afd66255b kprobes: Introduc... |
633 634 635 |
} /* Unoptimize a kprobe if p is optimized */ |
55479f647 kprobes: Allow pr... |
636 |
static void unoptimize_kprobe(struct kprobe *p, bool force) |
afd66255b kprobes: Introduc... |
637 638 |
{ struct optimized_kprobe *op; |
6274de498 kprobes: Support ... |
639 640 641 642 643 644 645 646 647 648 649 650 |
if (!kprobe_aggrprobe(p) || kprobe_disarmed(p)) return; /* This is not an optprobe nor optimized */ op = container_of(p, struct optimized_kprobe, kp); if (!kprobe_optimized(p)) { /* Unoptimized or unoptimizing case */ if (force && !list_empty(&op->list)) { /* * Only if this is unoptimizing kprobe and forced, * forcibly unoptimize it. (No need to unoptimize * unoptimized kprobe again :) */ |
afd66255b kprobes: Introduc... |
651 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 |
force_unoptimize_kprobe(op); } return; } op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; if (!list_empty(&op->list)) { /* Dequeue from the optimization queue */ list_del_init(&op->list); return; } /* Optimized kprobe case */ if (force) /* Forcibly update the code: this is a special case */ force_unoptimize_kprobe(op); else { list_add(&op->list, &unoptimizing_list); kick_kprobe_optimizer(); |
afd66255b kprobes: Introduc... |
670 671 |
} } |
0490cd1f9 kprobes: Reuse un... |
672 |
/* Cancel unoptimizing for reusing */ |
0e0b860ff kprobes: Return e... |
673 |
static int reuse_unused_kprobe(struct kprobe *ap) |
0490cd1f9 kprobes: Reuse un... |
674 675 |
{ struct optimized_kprobe *op; |
0e0b860ff kprobes: Return e... |
676 |
int ret; |
0490cd1f9 kprobes: Reuse un... |
677 678 679 680 681 682 683 684 685 686 687 688 689 690 |
BUG_ON(!kprobe_unused(ap)); /* * 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); if (unlikely(list_empty(&op->list))) printk(KERN_WARNING "Warning: found a stray unused " "aggrprobe@%p ", ap->addr); /* Enable the probe again */ ap->flags &= ~KPROBE_FLAG_DISABLED; /* Optimize it again (remove from op->list) */ |
0e0b860ff kprobes: Return e... |
691 692 693 |
ret = kprobe_optready(ap); if (ret) return ret; |
0490cd1f9 kprobes: Reuse un... |
694 |
optimize_kprobe(ap); |
0e0b860ff kprobes: Return e... |
695 |
return 0; |
0490cd1f9 kprobes: Reuse un... |
696 |
} |
afd66255b kprobes: Introduc... |
697 |
/* Remove optimized instructions */ |
55479f647 kprobes: Allow pr... |
698 |
static void kill_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
699 700 701 702 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
6274de498 kprobes: Support ... |
703 704 |
if (!list_empty(&op->list)) /* Dequeue from the (un)optimization queue */ |
afd66255b kprobes: Introduc... |
705 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
706 |
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
7b959fc58 kprobes: Fix to f... |
707 708 709 710 711 712 713 714 715 716 717 |
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 ... |
718 |
/* Don't touch the code, because it is already freed. */ |
afd66255b kprobes: Introduc... |
719 720 |
arch_remove_optimized_kprobe(op); } |
a460246c7 kprobes: Skip pre... |
721 722 723 724 725 726 |
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... |
727 |
/* Try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
728 |
static void prepare_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
729 730 731 732 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
a460246c7 kprobes: Skip pre... |
733 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
734 |
} |
afd66255b kprobes: Introduc... |
735 |
/* Allocate new optimized_kprobe and try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
736 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
737 738 739 740 741 742 743 744 745 |
{ 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... |
746 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
747 748 749 |
return &op->kp; } |
55479f647 kprobes: Allow pr... |
750 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p); |
afd66255b kprobes: Introduc... |
751 752 753 754 755 |
/* * Prepare an optimized_kprobe and optimize it * NOTE: p must be a normal registered kprobe */ |
55479f647 kprobes: Allow pr... |
756 |
static void try_to_optimize_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
757 758 759 |
{ struct kprobe *ap; struct optimized_kprobe *op; |
ae6aa16fd kprobes: introduc... |
760 761 762 |
/* Impossible to optimize ftrace-based kprobe */ if (kprobe_ftrace(p)) return; |
25764288d kprobes: Move loc... |
763 |
/* For preparing optimization, jump_label_text_reserved() is called */ |
2d1e38f56 kprobes: Cure hot... |
764 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
765 766 |
jump_label_lock(); mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
767 768 |
ap = alloc_aggr_kprobe(p); if (!ap) |
25764288d kprobes: Move loc... |
769 |
goto out; |
afd66255b kprobes: Introduc... |
770 771 772 773 |
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 ... |
774 775 |
arch_remove_optimized_kprobe(op); kfree(op); |
25764288d kprobes: Move loc... |
776 |
goto out; |
afd66255b kprobes: Introduc... |
777 778 779 |
} init_aggr_kprobe(ap, p); |
25764288d kprobes: Move loc... |
780 781 782 783 784 |
optimize_kprobe(ap); /* This just kicks optimizer thread */ out: mutex_unlock(&text_mutex); jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
785 |
cpus_read_unlock(); |
afd66255b kprobes: Introduc... |
786 |
} |
b2be84df9 kprobes: Jump opt... |
787 |
#ifdef CONFIG_SYSCTL |
55479f647 kprobes: Allow pr... |
788 |
static void optimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
789 790 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
791 792 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
793 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
794 795 |
/* If optimization is already allowed, just return */ if (kprobes_allow_optimization) |
5c51543b0 kprobes: Fix a do... |
796 |
goto out; |
b2be84df9 kprobes: Jump opt... |
797 |
|
2d1e38f56 kprobes: Cure hot... |
798 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
799 |
kprobes_allow_optimization = true; |
b2be84df9 kprobes: Jump opt... |
800 801 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
802 |
hlist_for_each_entry_rcu(p, head, hlist) |
b2be84df9 kprobes: Jump opt... |
803 804 805 |
if (!kprobe_disabled(p)) optimize_kprobe(p); } |
2d1e38f56 kprobes: Cure hot... |
806 |
cpus_read_unlock(); |
b2be84df9 kprobes: Jump opt... |
807 808 |
printk(KERN_INFO "Kprobes globally optimized "); |
5c51543b0 kprobes: Fix a do... |
809 810 |
out: mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
811 |
} |
55479f647 kprobes: Allow pr... |
812 |
static void unoptimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
813 814 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
815 816 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
817 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
818 |
/* If optimization is already prohibited, just return */ |
5c51543b0 kprobes: Fix a do... |
819 820 |
if (!kprobes_allow_optimization) { mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
821 |
return; |
5c51543b0 kprobes: Fix a do... |
822 |
} |
b2be84df9 kprobes: Jump opt... |
823 |
|
2d1e38f56 kprobes: Cure hot... |
824 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
825 |
kprobes_allow_optimization = false; |
b2be84df9 kprobes: Jump opt... |
826 827 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
828 |
hlist_for_each_entry_rcu(p, head, hlist) { |
b2be84df9 kprobes: Jump opt... |
829 |
if (!kprobe_disabled(p)) |
6274de498 kprobes: Support ... |
830 |
unoptimize_kprobe(p, false); |
b2be84df9 kprobes: Jump opt... |
831 832 |
} } |
2d1e38f56 kprobes: Cure hot... |
833 |
cpus_read_unlock(); |
5c51543b0 kprobes: Fix a do... |
834 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
835 836 837 838 |
/* Wait for unoptimizing completion */ wait_for_kprobe_optimizer(); printk(KERN_INFO "Kprobes globally unoptimized "); |
b2be84df9 kprobes: Jump opt... |
839 |
} |
5c51543b0 kprobes: Fix a do... |
840 |
static DEFINE_MUTEX(kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
841 842 843 844 845 846 |
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... |
847 |
mutex_lock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
848 849 850 851 852 853 854 |
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... |
855 |
mutex_unlock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
856 857 858 859 |
return ret; } #endif /* CONFIG_SYSCTL */ |
6274de498 kprobes: Support ... |
860 |
/* Put a breakpoint for a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
861 |
static void __arm_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
862 |
{ |
6d8e40a85 kprobes: Rename o... |
863 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
864 865 |
/* Check collision with other optimized kprobes */ |
6d8e40a85 kprobes: Rename o... |
866 867 |
_p = get_optimized_kprobe((unsigned long)p->addr); if (unlikely(_p)) |
6274de498 kprobes: Support ... |
868 869 |
/* Fallback to unoptimized kprobe */ unoptimize_kprobe(_p, true); |
afd66255b kprobes: Introduc... |
870 871 872 873 |
arch_arm_kprobe(p); optimize_kprobe(p); /* Try to optimize (add kprobe to a list) */ } |
6274de498 kprobes: Support ... |
874 |
/* Remove the breakpoint of a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
875 |
static void __disarm_kprobe(struct kprobe *p, bool reopt) |
afd66255b kprobes: Introduc... |
876 |
{ |
6d8e40a85 kprobes: Rename o... |
877 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
878 |
|
69d54b916 kprobes: makes kp... |
879 880 |
/* Try to unoptimize */ unoptimize_kprobe(p, kprobes_all_disarmed); |
afd66255b kprobes: Introduc... |
881 |
|
6274de498 kprobes: Support ... |
882 883 884 885 886 887 888 889 |
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... |
890 891 892 893 894 |
} #else /* !CONFIG_OPTPROBES */ #define optimize_kprobe(p) do {} while (0) |
6274de498 kprobes: Support ... |
895 |
#define unoptimize_kprobe(p, f) do {} while (0) |
afd66255b kprobes: Introduc... |
896 897 898 899 |
#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 ... |
900 901 902 |
#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... |
903 |
|
0e0b860ff kprobes: Return e... |
904 |
static int reuse_unused_kprobe(struct kprobe *ap) |
0490cd1f9 kprobes: Reuse un... |
905 |
{ |
0e0b860ff kprobes: Return e... |
906 907 908 909 910 911 |
/* * 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... |
912 913 |
printk(KERN_ERR "Error: There should be no unused kprobe here. "); |
0e0b860ff kprobes: Return e... |
914 |
return -EINVAL; |
0490cd1f9 kprobes: Reuse un... |
915 |
} |
55479f647 kprobes: Allow pr... |
916 |
static void free_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
917 |
{ |
6274de498 kprobes: Support ... |
918 |
arch_remove_kprobe(p); |
afd66255b kprobes: Introduc... |
919 920 |
kfree(p); } |
55479f647 kprobes: Allow pr... |
921 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
922 923 924 925 |
{ return kzalloc(sizeof(struct kprobe), GFP_KERNEL); } #endif /* CONFIG_OPTPROBES */ |
e7dbfe349 kprobes/x86: Move... |
926 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
927 |
static struct ftrace_ops kprobe_ftrace_ops __read_mostly = { |
e52538965 kprobes/x86: ftra... |
928 |
.func = kprobe_ftrace_handler, |
1d70be34d kprobes: Add IPMO... |
929 |
.flags = FTRACE_OPS_FL_SAVE_REGS | FTRACE_OPS_FL_IPMODIFY, |
ae6aa16fd kprobes: introduc... |
930 931 932 933 |
}; static int kprobe_ftrace_enabled; /* Must ensure p->addr is really on ftrace */ |
55479f647 kprobes: Allow pr... |
934 |
static int prepare_kprobe(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
935 936 937 938 939 940 941 942 |
{ if (!kprobe_ftrace(p)) return arch_prepare_kprobe(p); return arch_prepare_kprobe_ftrace(p); } /* Caller must lock kprobe_mutex */ |
55479f647 kprobes: Allow pr... |
943 |
static void arm_kprobe_ftrace(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 |
{ int ret; ret = ftrace_set_filter_ip(&kprobe_ftrace_ops, (unsigned long)p->addr, 0, 0); WARN(ret < 0, "Failed to arm kprobe-ftrace at %p (%d) ", p->addr, ret); kprobe_ftrace_enabled++; if (kprobe_ftrace_enabled == 1) { ret = register_ftrace_function(&kprobe_ftrace_ops); WARN(ret < 0, "Failed to init kprobe-ftrace (%d) ", ret); } } /* Caller must lock kprobe_mutex */ |
55479f647 kprobes: Allow pr... |
960 |
static void disarm_kprobe_ftrace(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
961 962 963 964 965 966 967 968 969 970 971 972 973 974 |
{ int ret; kprobe_ftrace_enabled--; if (kprobe_ftrace_enabled == 0) { ret = unregister_ftrace_function(&kprobe_ftrace_ops); WARN(ret < 0, "Failed to init kprobe-ftrace (%d) ", ret); } ret = ftrace_set_filter_ip(&kprobe_ftrace_ops, (unsigned long)p->addr, 1, 0); WARN(ret < 0, "Failed to disarm kprobe-ftrace at %p (%d) ", p->addr, ret); } |
e7dbfe349 kprobes/x86: Move... |
975 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
976 977 978 979 |
#define prepare_kprobe(p) arch_prepare_kprobe(p) #define arm_kprobe_ftrace(p) do {} while (0) #define disarm_kprobe_ftrace(p) do {} while (0) #endif |
201517a7f kprobes: fix to u... |
980 |
/* Arm a kprobe with text_mutex */ |
55479f647 kprobes: Allow pr... |
981 |
static void arm_kprobe(struct kprobe *kp) |
201517a7f kprobes: fix to u... |
982 |
{ |
ae6aa16fd kprobes: introduc... |
983 984 985 986 |
if (unlikely(kprobe_ftrace(kp))) { arm_kprobe_ftrace(kp); return; } |
2d1e38f56 kprobes: Cure hot... |
987 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
988 |
mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
989 |
__arm_kprobe(kp); |
201517a7f kprobes: fix to u... |
990 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
991 |
cpus_read_unlock(); |
201517a7f kprobes: fix to u... |
992 993 994 |
} /* Disarm a kprobe with text_mutex */ |
55479f647 kprobes: Allow pr... |
995 |
static void disarm_kprobe(struct kprobe *kp, bool reopt) |
201517a7f kprobes: fix to u... |
996 |
{ |
ae6aa16fd kprobes: introduc... |
997 998 999 1000 |
if (unlikely(kprobe_ftrace(kp))) { disarm_kprobe_ftrace(kp); return; } |
2d1e38f56 kprobes: Cure hot... |
1001 1002 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
1003 |
mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
1004 |
__disarm_kprobe(kp, reopt); |
201517a7f kprobes: fix to u... |
1005 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1006 |
cpus_read_unlock(); |
201517a7f kprobes: fix to u... |
1007 |
} |
64f562c6d [PATCH] kprobes: ... |
1008 1009 1010 1011 |
/* * Aggregate handlers for multiple kprobes support - these handlers * take care of invoking the individual kprobe handlers on p->list */ |
820aede02 kprobes: Use NOKP... |
1012 |
static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs) |
64f562c6d [PATCH] kprobes: ... |
1013 1014 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1015 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1016 |
if (kp->pre_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1017 |
set_kprobe_instance(kp); |
8b0914ea7 [PATCH] jprobes: ... |
1018 1019 |
if (kp->pre_handler(kp, regs)) return 1; |
64f562c6d [PATCH] kprobes: ... |
1020 |
} |
e65845235 [PATCH] Kprobes: ... |
1021 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1022 1023 1024 |
} return 0; } |
820aede02 kprobes: Use NOKP... |
1025 |
NOKPROBE_SYMBOL(aggr_pre_handler); |
64f562c6d [PATCH] kprobes: ... |
1026 |
|
820aede02 kprobes: Use NOKP... |
1027 1028 |
static void aggr_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) |
64f562c6d [PATCH] kprobes: ... |
1029 1030 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1031 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1032 |
if (kp->post_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1033 |
set_kprobe_instance(kp); |
64f562c6d [PATCH] kprobes: ... |
1034 |
kp->post_handler(kp, regs, flags); |
e65845235 [PATCH] Kprobes: ... |
1035 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1036 1037 |
} } |
64f562c6d [PATCH] kprobes: ... |
1038 |
} |
820aede02 kprobes: Use NOKP... |
1039 |
NOKPROBE_SYMBOL(aggr_post_handler); |
64f562c6d [PATCH] kprobes: ... |
1040 |
|
820aede02 kprobes: Use NOKP... |
1041 1042 |
static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs, int trapnr) |
64f562c6d [PATCH] kprobes: ... |
1043 |
{ |
b76834bc1 kprobes: Use this... |
1044 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1045 |
|
64f562c6d [PATCH] kprobes: ... |
1046 1047 1048 1049 |
/* * if we faulted "during" the execution of a user specified * probe handler, invoke just that probe's fault handler */ |
e65845235 [PATCH] Kprobes: ... |
1050 1051 |
if (cur && cur->fault_handler) { if (cur->fault_handler(cur, regs, trapnr)) |
64f562c6d [PATCH] kprobes: ... |
1052 1053 1054 1055 |
return 1; } return 0; } |
820aede02 kprobes: Use NOKP... |
1056 |
NOKPROBE_SYMBOL(aggr_fault_handler); |
64f562c6d [PATCH] kprobes: ... |
1057 |
|
820aede02 kprobes: Use NOKP... |
1058 |
static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs) |
8b0914ea7 [PATCH] jprobes: ... |
1059 |
{ |
b76834bc1 kprobes: Use this... |
1060 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1061 1062 1063 1064 1065 |
int ret = 0; if (cur && cur->break_handler) { if (cur->break_handler(cur, regs)) ret = 1; |
8b0914ea7 [PATCH] jprobes: ... |
1066 |
} |
e65845235 [PATCH] Kprobes: ... |
1067 1068 |
reset_kprobe_instance(); return ret; |
8b0914ea7 [PATCH] jprobes: ... |
1069 |
} |
820aede02 kprobes: Use NOKP... |
1070 |
NOKPROBE_SYMBOL(aggr_break_handler); |
8b0914ea7 [PATCH] jprobes: ... |
1071 |
|
bf8d5c52c [PATCH] kprobes: ... |
1072 |
/* Walks the list and increments nmissed count for multiprobe case */ |
820aede02 kprobes: Use NOKP... |
1073 |
void kprobes_inc_nmissed_count(struct kprobe *p) |
bf8d5c52c [PATCH] kprobes: ... |
1074 1075 |
{ struct kprobe *kp; |
afd66255b kprobes: Introduc... |
1076 |
if (!kprobe_aggrprobe(p)) { |
bf8d5c52c [PATCH] kprobes: ... |
1077 1078 1079 1080 1081 1082 1083 |
p->nmissed++; } else { list_for_each_entry_rcu(kp, &p->list, list) kp->nmissed++; } return; } |
820aede02 kprobes: Use NOKP... |
1084 |
NOKPROBE_SYMBOL(kprobes_inc_nmissed_count); |
bf8d5c52c [PATCH] kprobes: ... |
1085 |
|
820aede02 kprobes: Use NOKP... |
1086 1087 |
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head) |
b94cce926 [PATCH] kprobes: ... |
1088 |
{ |
ef53d9c5e kprobes: improve ... |
1089 |
struct kretprobe *rp = ri->rp; |
b94cce926 [PATCH] kprobes: ... |
1090 1091 |
/* remove rp inst off the rprobe_inst_table */ hlist_del(&ri->hlist); |
ef53d9c5e kprobes: improve ... |
1092 1093 |
INIT_HLIST_NODE(&ri->hlist); if (likely(rp)) { |
ec484608c locking, kprobes:... |
1094 |
raw_spin_lock(&rp->lock); |
ef53d9c5e kprobes: improve ... |
1095 |
hlist_add_head(&ri->hlist, &rp->free_instances); |
ec484608c locking, kprobes:... |
1096 |
raw_spin_unlock(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1097 1098 |
} else /* Unregistering */ |
99219a3fb [PATCH] kretprobe... |
1099 |
hlist_add_head(&ri->hlist, head); |
b94cce926 [PATCH] kprobes: ... |
1100 |
} |
820aede02 kprobes: Use NOKP... |
1101 |
NOKPROBE_SYMBOL(recycle_rp_inst); |
b94cce926 [PATCH] kprobes: ... |
1102 |
|
820aede02 kprobes: Use NOKP... |
1103 |
void kretprobe_hash_lock(struct task_struct *tsk, |
ef53d9c5e kprobes: improve ... |
1104 |
struct hlist_head **head, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1105 |
__acquires(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1106 1107 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1108 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1109 1110 1111 |
*head = &kretprobe_inst_table[hash]; hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1112 |
raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1113 |
} |
820aede02 kprobes: Use NOKP... |
1114 |
NOKPROBE_SYMBOL(kretprobe_hash_lock); |
ef53d9c5e kprobes: improve ... |
1115 |
|
820aede02 kprobes: Use NOKP... |
1116 1117 |
static void kretprobe_table_lock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1118 |
__acquires(hlist_lock) |
b94cce926 [PATCH] kprobes: ... |
1119 |
{ |
ec484608c locking, kprobes:... |
1120 1121 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1122 |
} |
820aede02 kprobes: Use NOKP... |
1123 |
NOKPROBE_SYMBOL(kretprobe_table_lock); |
ef53d9c5e kprobes: improve ... |
1124 |
|
820aede02 kprobes: Use NOKP... |
1125 1126 |
void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1127 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1128 1129 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1130 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1131 1132 |
hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1133 |
raw_spin_unlock_irqrestore(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1134 |
} |
820aede02 kprobes: Use NOKP... |
1135 |
NOKPROBE_SYMBOL(kretprobe_hash_unlock); |
ef53d9c5e kprobes: improve ... |
1136 |
|
820aede02 kprobes: Use NOKP... |
1137 1138 |
static void kretprobe_table_unlock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1139 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1140 |
{ |
ec484608c locking, kprobes:... |
1141 1142 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_unlock_irqrestore(hlist_lock, *flags); |
b94cce926 [PATCH] kprobes: ... |
1143 |
} |
820aede02 kprobes: Use NOKP... |
1144 |
NOKPROBE_SYMBOL(kretprobe_table_unlock); |
b94cce926 [PATCH] kprobes: ... |
1145 |
|
b94cce926 [PATCH] kprobes: ... |
1146 |
/* |
c6fd91f0b [PATCH] kretprobe... |
1147 1148 1149 1150 |
* 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: ... |
1151 |
*/ |
820aede02 kprobes: Use NOKP... |
1152 |
void kprobe_flush_task(struct task_struct *tk) |
b94cce926 [PATCH] kprobes: ... |
1153 |
{ |
62c27be0d [PATCH] kprobe wh... |
1154 |
struct kretprobe_instance *ri; |
99219a3fb [PATCH] kretprobe... |
1155 |
struct hlist_head *head, empty_rp; |
b67bfe0d4 hlist: drop the n... |
1156 |
struct hlist_node *tmp; |
ef53d9c5e kprobes: improve ... |
1157 |
unsigned long hash, flags = 0; |
802eae7c8 [PATCH] Return pr... |
1158 |
|
ef53d9c5e kprobes: improve ... |
1159 1160 1161 |
if (unlikely(!kprobes_initialized)) /* Early boot. kretprobe_table_locks not yet initialized. */ return; |
d496aab56 kprobes: initiali... |
1162 |
INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5e kprobes: improve ... |
1163 1164 1165 |
hash = hash_ptr(tk, KPROBE_HASH_BITS); head = &kretprobe_inst_table[hash]; kretprobe_table_lock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1166 |
hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
62c27be0d [PATCH] kprobe wh... |
1167 |
if (ri->task == tk) |
99219a3fb [PATCH] kretprobe... |
1168 |
recycle_rp_inst(ri, &empty_rp); |
62c27be0d [PATCH] kprobe wh... |
1169 |
} |
ef53d9c5e kprobes: improve ... |
1170 |
kretprobe_table_unlock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1171 |
hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3fb [PATCH] kretprobe... |
1172 1173 1174 |
hlist_del(&ri->hlist); kfree(ri); } |
b94cce926 [PATCH] kprobes: ... |
1175 |
} |
820aede02 kprobes: Use NOKP... |
1176 |
NOKPROBE_SYMBOL(kprobe_flush_task); |
b94cce926 [PATCH] kprobes: ... |
1177 |
|
b94cce926 [PATCH] kprobes: ... |
1178 1179 1180 |
static inline void free_rp_inst(struct kretprobe *rp) { struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1181 |
struct hlist_node *next; |
4c4308cb9 kprobes: kretprob... |
1182 |
|
b67bfe0d4 hlist: drop the n... |
1183 |
hlist_for_each_entry_safe(ri, next, &rp->free_instances, hlist) { |
ef53d9c5e kprobes: improve ... |
1184 |
hlist_del(&ri->hlist); |
b94cce926 [PATCH] kprobes: ... |
1185 1186 1187 |
kfree(ri); } } |
820aede02 kprobes: Use NOKP... |
1188 |
static void cleanup_rp_inst(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1189 |
{ |
ef53d9c5e kprobes: improve ... |
1190 |
unsigned long flags, hash; |
4a296e07c kprobes: add (un)... |
1191 |
struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1192 |
struct hlist_node *next; |
ef53d9c5e kprobes: improve ... |
1193 |
struct hlist_head *head; |
4a296e07c kprobes: add (un)... |
1194 |
/* No race here */ |
ef53d9c5e kprobes: improve ... |
1195 1196 1197 |
for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) { kretprobe_table_lock(hash, &flags); head = &kretprobe_inst_table[hash]; |
b67bfe0d4 hlist: drop the n... |
1198 |
hlist_for_each_entry_safe(ri, next, head, hlist) { |
ef53d9c5e kprobes: improve ... |
1199 1200 1201 1202 |
if (ri->rp == rp) ri->rp = NULL; } kretprobe_table_unlock(hash, &flags); |
4a296e07c kprobes: add (un)... |
1203 |
} |
4a296e07c kprobes: add (un)... |
1204 1205 |
free_rp_inst(rp); } |
820aede02 kprobes: Use NOKP... |
1206 |
NOKPROBE_SYMBOL(cleanup_rp_inst); |
4a296e07c kprobes: add (un)... |
1207 |
|
64f562c6d [PATCH] kprobes: ... |
1208 |
/* |
b918e5e60 kprobes: cleanup ... |
1209 |
* Add the new probe to ap->list. Fail if this is the |
8b0914ea7 [PATCH] jprobes: ... |
1210 1211 |
* second jprobe at the address - two jprobes can't coexist */ |
55479f647 kprobes: Allow pr... |
1212 |
static int add_new_kprobe(struct kprobe *ap, struct kprobe *p) |
8b0914ea7 [PATCH] jprobes: ... |
1213 |
{ |
de5bd88d5 kprobes: support ... |
1214 |
BUG_ON(kprobe_gone(ap) || kprobe_gone(p)); |
afd66255b kprobes: Introduc... |
1215 1216 |
if (p->break_handler || p->post_handler) |
6274de498 kprobes: Support ... |
1217 |
unoptimize_kprobe(ap, true); /* Fall back to normal kprobe */ |
afd66255b kprobes: Introduc... |
1218 |
|
8b0914ea7 [PATCH] jprobes: ... |
1219 |
if (p->break_handler) { |
b918e5e60 kprobes: cleanup ... |
1220 |
if (ap->break_handler) |
367216567 [PATCH] Kprobe: m... |
1221 |
return -EEXIST; |
b918e5e60 kprobes: cleanup ... |
1222 1223 |
list_add_tail_rcu(&p->list, &ap->list); ap->break_handler = aggr_break_handler; |
8b0914ea7 [PATCH] jprobes: ... |
1224 |
} else |
b918e5e60 kprobes: cleanup ... |
1225 1226 1227 |
list_add_rcu(&p->list, &ap->list); if (p->post_handler && !ap->post_handler) ap->post_handler = aggr_post_handler; |
de5bd88d5 kprobes: support ... |
1228 |
|
8b0914ea7 [PATCH] jprobes: ... |
1229 1230 1231 1232 |
return 0; } /* |
64f562c6d [PATCH] kprobes: ... |
1233 1234 1235 |
* Fill in the required fields of the "manager kprobe". Replace the * earlier kprobe in the hlist with the manager kprobe */ |
55479f647 kprobes: Allow pr... |
1236 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1237 |
{ |
afd66255b kprobes: Introduc... |
1238 |
/* Copy p's insn slot to ap */ |
8b0914ea7 [PATCH] jprobes: ... |
1239 |
copy_kprobe(p, ap); |
a9ad965ea [PATCH] IA64: kpr... |
1240 |
flush_insn_slot(ap); |
64f562c6d [PATCH] kprobes: ... |
1241 |
ap->addr = p->addr; |
afd66255b kprobes: Introduc... |
1242 |
ap->flags = p->flags & ~KPROBE_FLAG_OPTIMIZED; |
64f562c6d [PATCH] kprobes: ... |
1243 |
ap->pre_handler = aggr_pre_handler; |
64f562c6d [PATCH] kprobes: ... |
1244 |
ap->fault_handler = aggr_fault_handler; |
e8386a0cb kprobes: support ... |
1245 1246 |
/* We don't care the kprobe which has gone. */ if (p->post_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1247 |
ap->post_handler = aggr_post_handler; |
e8386a0cb kprobes: support ... |
1248 |
if (p->break_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1249 |
ap->break_handler = aggr_break_handler; |
64f562c6d [PATCH] kprobes: ... |
1250 1251 |
INIT_LIST_HEAD(&ap->list); |
afd66255b kprobes: Introduc... |
1252 |
INIT_HLIST_NODE(&ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1253 |
|
afd66255b kprobes: Introduc... |
1254 |
list_add_rcu(&p->list, &ap->list); |
adad0f331 [PATCH] kprobes: ... |
1255 |
hlist_replace_rcu(&p->hlist, &ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1256 1257 1258 1259 1260 |
} /* * This is the second or subsequent kprobe at the address - handle * the intricacies |
64f562c6d [PATCH] kprobes: ... |
1261 |
*/ |
55479f647 kprobes: Allow pr... |
1262 |
static int register_aggr_kprobe(struct kprobe *orig_p, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1263 1264 |
{ int ret = 0; |
6d8e40a85 kprobes: Rename o... |
1265 |
struct kprobe *ap = orig_p; |
64f562c6d [PATCH] kprobes: ... |
1266 |
|
2d1e38f56 kprobes: Cure hot... |
1267 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
1268 1269 |
/* For preparing optimization, jump_label_text_reserved() is called */ jump_label_lock(); |
25764288d kprobes: Move loc... |
1270 |
mutex_lock(&text_mutex); |
6d8e40a85 kprobes: Rename o... |
1271 1272 1273 |
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... |
1274 1275 1276 1277 |
if (!ap) { ret = -ENOMEM; goto out; } |
6d8e40a85 kprobes: Rename o... |
1278 |
init_aggr_kprobe(ap, orig_p); |
0e0b860ff kprobes: Return e... |
1279 |
} else if (kprobe_unused(ap)) { |
0490cd1f9 kprobes: Reuse un... |
1280 |
/* This probe is going to die. Rescue it */ |
0e0b860ff kprobes: Return e... |
1281 1282 1283 1284 |
ret = reuse_unused_kprobe(ap); if (ret) goto out; } |
b918e5e60 kprobes: cleanup ... |
1285 1286 |
if (kprobe_gone(ap)) { |
e8386a0cb kprobes: support ... |
1287 1288 1289 1290 1291 1292 |
/* * 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 ... |
1293 |
ret = arch_prepare_kprobe(ap); |
e8386a0cb kprobes: support ... |
1294 |
if (ret) |
b918e5e60 kprobes: cleanup ... |
1295 1296 1297 1298 1299 |
/* * 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... |
1300 |
goto out; |
de5bd88d5 kprobes: support ... |
1301 |
|
afd66255b kprobes: Introduc... |
1302 1303 |
/* Prepare optimized instructions if possible. */ prepare_optimized_kprobe(ap); |
e8386a0cb kprobes: support ... |
1304 |
/* |
de5bd88d5 kprobes: support ... |
1305 1306 |
* Clear gone flag to prevent allocating new slot again, and * set disabled flag because it is not armed yet. |
e8386a0cb kprobes: support ... |
1307 |
*/ |
de5bd88d5 kprobes: support ... |
1308 1309 |
ap->flags = (ap->flags & ~KPROBE_FLAG_GONE) | KPROBE_FLAG_DISABLED; |
e8386a0cb kprobes: support ... |
1310 |
} |
b918e5e60 kprobes: cleanup ... |
1311 |
|
afd66255b kprobes: Introduc... |
1312 |
/* Copy ap's insn slot to p */ |
b918e5e60 kprobes: cleanup ... |
1313 |
copy_kprobe(ap, p); |
25764288d kprobes: Move loc... |
1314 1315 1316 1317 |
ret = add_new_kprobe(ap, p); out: mutex_unlock(&text_mutex); |
25764288d kprobes: Move loc... |
1318 |
jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
1319 |
cpus_read_unlock(); |
25764288d kprobes: Move loc... |
1320 1321 1322 1323 1324 1325 1326 1327 |
if (ret == 0 && kprobe_disabled(ap) && !kprobe_disabled(p)) { ap->flags &= ~KPROBE_FLAG_DISABLED; if (!kprobes_all_disarmed) /* Arm the breakpoint again. */ arm_kprobe(ap); } return ret; |
64f562c6d [PATCH] kprobes: ... |
1328 |
} |
be8f27432 kprobes: Prohibit... |
1329 1330 1331 1332 1333 1334 |
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; } |
e5779e8e1 perf/x86/hw_break... |
1335 |
bool within_kprobe_blacklist(unsigned long addr) |
d0aaff979 [PATCH] Kprobes: ... |
1336 |
{ |
376e24242 kprobes: Introduc... |
1337 |
struct kprobe_blacklist_entry *ent; |
3d8d996e0 kprobes: prevent ... |
1338 |
|
be8f27432 kprobes: Prohibit... |
1339 |
if (arch_within_kprobe_blacklist(addr)) |
376e24242 kprobes: Introduc... |
1340 |
return true; |
3d8d996e0 kprobes: prevent ... |
1341 1342 1343 1344 |
/* * If there exists a kprobe_blacklist, verify and * fail any probe registration in the prohibited area */ |
376e24242 kprobes: Introduc... |
1345 1346 1347 |
list_for_each_entry(ent, &kprobe_blacklist, list) { if (addr >= ent->start_addr && addr < ent->end_addr) return true; |
3d8d996e0 kprobes: prevent ... |
1348 |
} |
376e24242 kprobes: Introduc... |
1349 1350 |
return false; |
d0aaff979 [PATCH] Kprobes: ... |
1351 |
} |
b2a5cd693 kprobes: fix a nu... |
1352 1353 1354 |
/* * 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 -... |
1355 1356 |
* This returns encoded errors if it fails to look up symbol or invalid * combination of parameters. |
b2a5cd693 kprobes: fix a nu... |
1357 |
*/ |
1d585e709 trace/kprobes: Fi... |
1358 1359 |
static kprobe_opcode_t *_kprobe_addr(kprobe_opcode_t *addr, const char *symbol_name, unsigned int offset) |
b2a5cd693 kprobes: fix a nu... |
1360 |
{ |
1d585e709 trace/kprobes: Fi... |
1361 |
if ((symbol_name && addr) || (!symbol_name && !addr)) |
bc81d48d1 kprobes: Return -... |
1362 |
goto invalid; |
1d585e709 trace/kprobes: Fi... |
1363 |
if (symbol_name) { |
7246f6006 Merge tag 'powerp... |
1364 |
addr = kprobe_lookup_name(symbol_name, offset); |
bc81d48d1 kprobes: Return -... |
1365 1366 |
if (!addr) return ERR_PTR(-ENOENT); |
b2a5cd693 kprobes: fix a nu... |
1367 |
} |
1d585e709 trace/kprobes: Fi... |
1368 |
addr = (kprobe_opcode_t *)(((char *)addr) + offset); |
bc81d48d1 kprobes: Return -... |
1369 1370 1371 1372 1373 |
if (addr) return addr; invalid: return ERR_PTR(-EINVAL); |
b2a5cd693 kprobes: fix a nu... |
1374 |
} |
1d585e709 trace/kprobes: Fi... |
1375 1376 1377 1378 |
static kprobe_opcode_t *kprobe_addr(struct kprobe *p) { return _kprobe_addr(p->addr, p->symbol_name, p->offset); } |
1f0ab4097 kprobes: Prevent ... |
1379 |
/* Check passed kprobe is valid and return kprobe in kprobe_table. */ |
55479f647 kprobes: Allow pr... |
1380 |
static struct kprobe *__get_valid_kprobe(struct kprobe *p) |
1f0ab4097 kprobes: Prevent ... |
1381 |
{ |
6d8e40a85 kprobes: Rename o... |
1382 |
struct kprobe *ap, *list_p; |
1f0ab4097 kprobes: Prevent ... |
1383 |
|
6d8e40a85 kprobes: Rename o... |
1384 1385 |
ap = get_kprobe(p->addr); if (unlikely(!ap)) |
1f0ab4097 kprobes: Prevent ... |
1386 |
return NULL; |
6d8e40a85 kprobes: Rename o... |
1387 1388 |
if (p != ap) { list_for_each_entry_rcu(list_p, &ap->list, list) |
1f0ab4097 kprobes: Prevent ... |
1389 1390 1391 1392 1393 1394 |
if (list_p == p) /* kprobe p is a valid probe */ goto valid; return NULL; } valid: |
6d8e40a85 kprobes: Rename o... |
1395 |
return ap; |
1f0ab4097 kprobes: Prevent ... |
1396 1397 1398 1399 1400 1401 |
} /* Return error if the kprobe is being re-registered */ static inline int check_kprobe_rereg(struct kprobe *p) { int ret = 0; |
1f0ab4097 kprobes: Prevent ... |
1402 1403 |
mutex_lock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1404 |
if (__get_valid_kprobe(p)) |
1f0ab4097 kprobes: Prevent ... |
1405 1406 |
ret = -EINVAL; mutex_unlock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1407 |
|
1f0ab4097 kprobes: Prevent ... |
1408 1409 |
return ret; } |
f7f242ff0 kprobes: introduc... |
1410 |
int __weak arch_check_ftrace_location(struct kprobe *p) |
1da177e4c Linux-2.6.12-rc2 |
1411 |
{ |
ae6aa16fd kprobes: introduc... |
1412 |
unsigned long ftrace_addr; |
ae6aa16fd kprobes: introduc... |
1413 1414 |
ftrace_addr = ftrace_location((unsigned long)p->addr); if (ftrace_addr) { |
e7dbfe349 kprobes/x86: Move... |
1415 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
1416 1417 1418 |
/* Given address is not on the instruction boundary */ if ((unsigned long)p->addr != ftrace_addr) return -EILSEQ; |
ae6aa16fd kprobes: introduc... |
1419 |
p->flags |= KPROBE_FLAG_FTRACE; |
e7dbfe349 kprobes/x86: Move... |
1420 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
1421 1422 1423 |
return -EINVAL; #endif } |
f7f242ff0 kprobes: introduc... |
1424 1425 1426 1427 1428 1429 1430 |
return 0; } static int check_kprobe_address_safe(struct kprobe *p, struct module **probed_mod) { int ret; |
1f0ab4097 kprobes: Prevent ... |
1431 |
|
f7f242ff0 kprobes: introduc... |
1432 1433 1434 |
ret = arch_check_ftrace_location(p); if (ret) return ret; |
91bad2f8d jump label: Fix d... |
1435 |
jump_label_lock(); |
de31c3ca8 jump label: Fix e... |
1436 |
preempt_disable(); |
f7fa6ef0d kprobes: cleanup ... |
1437 1438 |
/* Ensure it is not in reserved area nor out of text */ |
ec30c5f3a kprobes: Use kern... |
1439 |
if (!kernel_text_address((unsigned long) p->addr) || |
376e24242 kprobes: Introduc... |
1440 |
within_kprobe_blacklist((unsigned long) p->addr) || |
f986a499e kprobes: return p... |
1441 1442 |
jump_label_text_reserved(p->addr, p->addr)) { ret = -EINVAL; |
f7fa6ef0d kprobes: cleanup ... |
1443 |
goto out; |
f986a499e kprobes: return p... |
1444 |
} |
b3e55c727 [PATCH] Kprobes: ... |
1445 |
|
f7fa6ef0d kprobes: cleanup ... |
1446 1447 1448 |
/* Check if are we probing a module */ *probed_mod = __module_text_address((unsigned long) p->addr); if (*probed_mod) { |
6f716acd5 kprobes: codingst... |
1449 |
/* |
e8386a0cb kprobes: support ... |
1450 1451 |
* We must hold a refcount of the probed module while updating * its code to prohibit unexpected unloading. |
df019b1d8 [PATCH] kprobes: ... |
1452 |
*/ |
f7fa6ef0d kprobes: cleanup ... |
1453 1454 1455 1456 |
if (unlikely(!try_module_get(*probed_mod))) { ret = -ENOENT; goto out; } |
de31c3ca8 jump label: Fix e... |
1457 |
|
f24659d96 kprobes: support ... |
1458 1459 1460 1461 |
/* * If the module freed .init.text, we couldn't insert * kprobes in there. */ |
f7fa6ef0d kprobes: cleanup ... |
1462 1463 1464 1465 1466 |
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 ... |
1467 |
} |
df019b1d8 [PATCH] kprobes: ... |
1468 |
} |
f7fa6ef0d kprobes: cleanup ... |
1469 |
out: |
a189d0350 kprobes: disable ... |
1470 |
preempt_enable(); |
de31c3ca8 jump label: Fix e... |
1471 |
jump_label_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1472 |
|
f7fa6ef0d kprobes: cleanup ... |
1473 1474 |
return ret; } |
55479f647 kprobes: Allow pr... |
1475 |
int register_kprobe(struct kprobe *p) |
f7fa6ef0d kprobes: cleanup ... |
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 |
{ 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: ... |
1494 |
p->nmissed = 0; |
9861668f7 kprobes: add (un)... |
1495 |
INIT_LIST_HEAD(&p->list); |
afd66255b kprobes: Introduc... |
1496 |
|
f7fa6ef0d kprobes: cleanup ... |
1497 1498 1499 1500 1501 |
ret = check_kprobe_address_safe(p, &probed_mod); if (ret) return ret; mutex_lock(&kprobe_mutex); |
afd66255b kprobes: Introduc... |
1502 |
|
64f562c6d [PATCH] kprobes: ... |
1503 1504 |
old_p = get_kprobe(p->addr); if (old_p) { |
afd66255b kprobes: Introduc... |
1505 |
/* Since this may unoptimize old_p, locking text_mutex. */ |
64f562c6d [PATCH] kprobes: ... |
1506 |
ret = register_aggr_kprobe(old_p, p); |
1da177e4c Linux-2.6.12-rc2 |
1507 1508 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
1509 |
|
2d1e38f56 kprobes: Cure hot... |
1510 1511 1512 |
cpus_read_lock(); /* Prevent text modification */ mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
1513 |
ret = prepare_kprobe(p); |
25764288d kprobes: Move loc... |
1514 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1515 |
cpus_read_unlock(); |
6f716acd5 kprobes: codingst... |
1516 |
if (ret) |
afd66255b kprobes: Introduc... |
1517 |
goto out; |
49a2a1b83 [PATCH] kprobes: ... |
1518 |
|
64f562c6d [PATCH] kprobes: ... |
1519 |
INIT_HLIST_NODE(&p->hlist); |
3516a4604 [PATCH] Kprobes: ... |
1520 |
hlist_add_head_rcu(&p->hlist, |
1da177e4c Linux-2.6.12-rc2 |
1521 |
&kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]); |
de5bd88d5 kprobes: support ... |
1522 |
if (!kprobes_all_disarmed && !kprobe_disabled(p)) |
25764288d kprobes: Move loc... |
1523 |
arm_kprobe(p); |
afd66255b kprobes: Introduc... |
1524 1525 1526 |
/* Try to optimize kprobe */ try_to_optimize_kprobe(p); |
1da177e4c Linux-2.6.12-rc2 |
1527 |
out: |
7a7d1cf95 [PATCH] sem2mutex... |
1528 |
mutex_unlock(&kprobe_mutex); |
49a2a1b83 [PATCH] kprobes: ... |
1529 |
|
e8386a0cb kprobes: support ... |
1530 |
if (probed_mod) |
df019b1d8 [PATCH] kprobes: ... |
1531 |
module_put(probed_mod); |
e8386a0cb kprobes: support ... |
1532 |
|
1da177e4c Linux-2.6.12-rc2 |
1533 1534 |
return ret; } |
99081ab55 kprobes: move EXP... |
1535 |
EXPORT_SYMBOL_GPL(register_kprobe); |
1da177e4c Linux-2.6.12-rc2 |
1536 |
|
6f0f1dd71 kprobes: Cleanup ... |
1537 |
/* Check if all probes on the aggrprobe are disabled */ |
55479f647 kprobes: Allow pr... |
1538 |
static int aggr_kprobe_disabled(struct kprobe *ap) |
6f0f1dd71 kprobes: Cleanup ... |
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 |
{ 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... |
1554 |
static struct kprobe *__disable_kprobe(struct kprobe *p) |
6f0f1dd71 kprobes: Cleanup ... |
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 |
{ struct kprobe *orig_p; /* Get an original kprobe for return */ orig_p = __get_valid_kprobe(p); if (unlikely(orig_p == NULL)) return NULL; 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... |
1570 1571 1572 1573 1574 1575 1576 |
/* * If kprobes_all_disarmed is set, orig_p * should have already been disarmed, so * skip unneed disarming process. */ if (!kprobes_all_disarmed) disarm_kprobe(orig_p, true); |
6f0f1dd71 kprobes: Cleanup ... |
1577 1578 1579 1580 1581 1582 |
orig_p->flags |= KPROBE_FLAG_DISABLED; } } return orig_p; } |
de5bd88d5 kprobes: support ... |
1583 1584 1585 |
/* * Unregister a kprobe without a scheduler synchronization. */ |
55479f647 kprobes: Allow pr... |
1586 |
static int __unregister_kprobe_top(struct kprobe *p) |
de5bd88d5 kprobes: support ... |
1587 |
{ |
6d8e40a85 kprobes: Rename o... |
1588 |
struct kprobe *ap, *list_p; |
de5bd88d5 kprobes: support ... |
1589 |
|
6f0f1dd71 kprobes: Cleanup ... |
1590 1591 |
/* Disable kprobe. This will disarm it if needed. */ ap = __disable_kprobe(p); |
6d8e40a85 kprobes: Rename o... |
1592 |
if (ap == NULL) |
de5bd88d5 kprobes: support ... |
1593 |
return -EINVAL; |
6f0f1dd71 kprobes: Cleanup ... |
1594 |
if (ap == p) |
bf8f6e5b3 Kprobes: The ON/O... |
1595 |
/* |
6f0f1dd71 kprobes: Cleanup ... |
1596 1597 |
* This probe is an independent(and non-optimized) kprobe * (not an aggrprobe). Remove from the hash list. |
bf8f6e5b3 Kprobes: The ON/O... |
1598 |
*/ |
6f0f1dd71 kprobes: Cleanup ... |
1599 1600 1601 1602 |
goto disarmed; /* Following process expects this probe is an aggrprobe */ WARN_ON(!kprobe_aggrprobe(ap)); |
6274de498 kprobes: Support ... |
1603 1604 1605 1606 1607 |
if (list_is_singular(&ap->list) && kprobe_disarmed(ap)) /* * !disarmed could be happen if the probe is under delayed * unoptimizing. */ |
6f0f1dd71 kprobes: Cleanup ... |
1608 1609 1610 |
goto disarmed; else { /* If disabling probe has special handlers, update aggrprobe */ |
e8386a0cb kprobes: support ... |
1611 |
if (p->break_handler && !kprobe_gone(p)) |
6d8e40a85 kprobes: Rename o... |
1612 |
ap->break_handler = NULL; |
e8386a0cb kprobes: support ... |
1613 |
if (p->post_handler && !kprobe_gone(p)) { |
6d8e40a85 kprobes: Rename o... |
1614 |
list_for_each_entry_rcu(list_p, &ap->list, list) { |
9861668f7 kprobes: add (un)... |
1615 1616 1617 |
if ((list_p != p) && (list_p->post_handler)) goto noclean; } |
6d8e40a85 kprobes: Rename o... |
1618 |
ap->post_handler = NULL; |
9861668f7 kprobes: add (un)... |
1619 1620 |
} noclean: |
6f0f1dd71 kprobes: Cleanup ... |
1621 1622 1623 1624 |
/* * Remove from the aggrprobe: this path will do nothing in * __unregister_kprobe_bottom(). */ |
49a2a1b83 [PATCH] kprobes: ... |
1625 |
list_del_rcu(&p->list); |
6f0f1dd71 kprobes: Cleanup ... |
1626 1627 1628 1629 1630 1631 |
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: ... |
1632 |
} |
9861668f7 kprobes: add (un)... |
1633 |
return 0; |
6f0f1dd71 kprobes: Cleanup ... |
1634 1635 |
disarmed: |
6274de498 kprobes: Support ... |
1636 |
BUG_ON(!kprobe_disarmed(ap)); |
6f0f1dd71 kprobes: Cleanup ... |
1637 1638 |
hlist_del_rcu(&ap->hlist); return 0; |
9861668f7 kprobes: add (un)... |
1639 |
} |
3516a4604 [PATCH] Kprobes: ... |
1640 |
|
55479f647 kprobes: Allow pr... |
1641 |
static void __unregister_kprobe_bottom(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1642 |
{ |
6d8e40a85 kprobes: Rename o... |
1643 |
struct kprobe *ap; |
b3e55c727 [PATCH] Kprobes: ... |
1644 |
|
e8386a0cb kprobes: support ... |
1645 |
if (list_empty(&p->list)) |
6274de498 kprobes: Support ... |
1646 |
/* This is an independent kprobe */ |
0498b6350 [PATCH] kprobes: ... |
1647 |
arch_remove_kprobe(p); |
e8386a0cb kprobes: support ... |
1648 |
else if (list_is_singular(&p->list)) { |
6274de498 kprobes: Support ... |
1649 |
/* This is the last child of an aggrprobe */ |
6d8e40a85 kprobes: Rename o... |
1650 |
ap = list_entry(p->list.next, struct kprobe, list); |
e8386a0cb kprobes: support ... |
1651 |
list_del(&p->list); |
6d8e40a85 kprobes: Rename o... |
1652 |
free_aggr_kprobe(ap); |
9861668f7 kprobes: add (un)... |
1653 |
} |
6274de498 kprobes: Support ... |
1654 |
/* Otherwise, do nothing. */ |
9861668f7 kprobes: add (un)... |
1655 |
} |
55479f647 kprobes: Allow pr... |
1656 |
int register_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1657 1658 1659 1660 1661 1662 |
{ int i, ret = 0; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1663 |
ret = register_kprobe(kps[i]); |
67dddaad5 kprobes: fix erro... |
1664 1665 1666 |
if (ret < 0) { if (i > 0) unregister_kprobes(kps, i); |
9861668f7 kprobes: add (un)... |
1667 |
break; |
367216567 [PATCH] Kprobe: m... |
1668 |
} |
49a2a1b83 [PATCH] kprobes: ... |
1669 |
} |
9861668f7 kprobes: add (un)... |
1670 1671 |
return ret; } |
99081ab55 kprobes: move EXP... |
1672 |
EXPORT_SYMBOL_GPL(register_kprobes); |
9861668f7 kprobes: add (un)... |
1673 |
|
55479f647 kprobes: Allow pr... |
1674 |
void unregister_kprobe(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1675 1676 1677 |
{ unregister_kprobes(&p, 1); } |
99081ab55 kprobes: move EXP... |
1678 |
EXPORT_SYMBOL_GPL(unregister_kprobe); |
9861668f7 kprobes: add (un)... |
1679 |
|
55479f647 kprobes: Allow pr... |
1680 |
void unregister_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 |
{ 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); synchronize_sched(); for (i = 0; i < num; i++) if (kps[i]->addr) __unregister_kprobe_bottom(kps[i]); |
1da177e4c Linux-2.6.12-rc2 |
1696 |
} |
99081ab55 kprobes: move EXP... |
1697 |
EXPORT_SYMBOL_GPL(unregister_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
1698 |
|
5f6bee347 kprobes: Convert ... |
1699 1700 |
int __weak kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data) |
fc62d0207 kprobes: Introduc... |
1701 1702 1703 |
{ return NOTIFY_DONE; } |
5f6bee347 kprobes: Convert ... |
1704 |
NOKPROBE_SYMBOL(kprobe_exceptions_notify); |
fc62d0207 kprobes: Introduc... |
1705 |
|
1da177e4c Linux-2.6.12-rc2 |
1706 1707 |
static struct notifier_block kprobe_exceptions_nb = { .notifier_call = kprobe_exceptions_notify, |
3d5631e06 [PATCH] Kprobes r... |
1708 1709 |
.priority = 0x7fffffff /* we need to be notified first */ }; |
3d7e33825 jprobes: make jpr... |
1710 1711 1712 1713 |
unsigned long __weak arch_deref_entry_point(void *entry) { return (unsigned long)entry; } |
1da177e4c Linux-2.6.12-rc2 |
1714 |
|
55479f647 kprobes: Allow pr... |
1715 |
int register_jprobes(struct jprobe **jps, int num) |
1da177e4c Linux-2.6.12-rc2 |
1716 |
{ |
26b31c190 kprobes: add (un)... |
1717 |
int ret = 0, i; |
3d7e33825 jprobes: make jpr... |
1718 |
|
26b31c190 kprobes: add (un)... |
1719 |
if (num <= 0) |
3d7e33825 jprobes: make jpr... |
1720 |
return -EINVAL; |
0f73ff80b kprobes: Simplify... |
1721 |
|
26b31c190 kprobes: add (un)... |
1722 |
for (i = 0; i < num; i++) { |
0f73ff80b kprobes: Simplify... |
1723 |
ret = register_jprobe(jps[i]); |
edbaadbe4 kprobes: Remove r... |
1724 |
|
67dddaad5 kprobes: fix erro... |
1725 1726 1727 |
if (ret < 0) { if (i > 0) unregister_jprobes(jps, i); |
26b31c190 kprobes: add (un)... |
1728 1729 1730 |
break; } } |
0f73ff80b kprobes: Simplify... |
1731 |
|
26b31c190 kprobes: add (un)... |
1732 1733 |
return ret; } |
99081ab55 kprobes: move EXP... |
1734 |
EXPORT_SYMBOL_GPL(register_jprobes); |
3d7e33825 jprobes: make jpr... |
1735 |
|
55479f647 kprobes: Allow pr... |
1736 |
int register_jprobe(struct jprobe *jp) |
26b31c190 kprobes: add (un)... |
1737 |
{ |
0f73ff80b kprobes: Simplify... |
1738 1739 |
unsigned long addr, offset; struct kprobe *kp = &jp->kp; |
dbf580623 kprobes: Ensure t... |
1740 1741 1742 1743 |
/* * Verify probepoint as well as the jprobe handler are * valid function entry points. */ |
0f73ff80b kprobes: Simplify... |
1744 |
addr = arch_deref_entry_point(jp->entry); |
dbf580623 kprobes: Ensure t... |
1745 1746 |
if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0 && kprobe_on_func_entry(kp->addr, kp->symbol_name, kp->offset)) { |
0f73ff80b kprobes: Simplify... |
1747 1748 1749 1750 1751 1752 |
kp->pre_handler = setjmp_pre_handler; kp->break_handler = longjmp_break_handler; return register_kprobe(kp); } return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1753 |
} |
99081ab55 kprobes: move EXP... |
1754 |
EXPORT_SYMBOL_GPL(register_jprobe); |
1da177e4c Linux-2.6.12-rc2 |
1755 |
|
55479f647 kprobes: Allow pr... |
1756 |
void unregister_jprobe(struct jprobe *jp) |
1da177e4c Linux-2.6.12-rc2 |
1757 |
{ |
26b31c190 kprobes: add (un)... |
1758 1759 |
unregister_jprobes(&jp, 1); } |
99081ab55 kprobes: move EXP... |
1760 |
EXPORT_SYMBOL_GPL(unregister_jprobe); |
26b31c190 kprobes: add (un)... |
1761 |
|
55479f647 kprobes: Allow pr... |
1762 |
void unregister_jprobes(struct jprobe **jps, int num) |
26b31c190 kprobes: add (un)... |
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 |
{ int i; if (num <= 0) return; mutex_lock(&kprobe_mutex); for (i = 0; i < num; i++) if (__unregister_kprobe_top(&jps[i]->kp) < 0) jps[i]->kp.addr = NULL; mutex_unlock(&kprobe_mutex); synchronize_sched(); for (i = 0; i < num; i++) { if (jps[i]->kp.addr) __unregister_kprobe_bottom(&jps[i]->kp); } |
1da177e4c Linux-2.6.12-rc2 |
1779 |
} |
99081ab55 kprobes: move EXP... |
1780 |
EXPORT_SYMBOL_GPL(unregister_jprobes); |
1da177e4c Linux-2.6.12-rc2 |
1781 |
|
9edddaa20 Kprobes: indicate... |
1782 |
#ifdef CONFIG_KRETPROBES |
e65cefe87 [PATCH] kernel/kp... |
1783 1784 1785 1786 |
/* * This kprobe pre_handler is registered with every kretprobe. When probe * hits it will set up the return probe. */ |
820aede02 kprobes: Use NOKP... |
1787 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
e65cefe87 [PATCH] kernel/kp... |
1788 1789 |
{ struct kretprobe *rp = container_of(p, struct kretprobe, kp); |
ef53d9c5e kprobes: improve ... |
1790 1791 |
unsigned long hash, flags = 0; struct kretprobe_instance *ri; |
e65cefe87 [PATCH] kernel/kp... |
1792 |
|
f96f56780 kprobes: Skip kre... |
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 |
/* * 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 ... |
1805 |
hash = hash_ptr(current, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1806 |
raw_spin_lock_irqsave(&rp->lock, flags); |
4c4308cb9 kprobes: kretprob... |
1807 |
if (!hlist_empty(&rp->free_instances)) { |
4c4308cb9 kprobes: kretprob... |
1808 |
ri = hlist_entry(rp->free_instances.first, |
ef53d9c5e kprobes: improve ... |
1809 1810 |
struct kretprobe_instance, hlist); hlist_del(&ri->hlist); |
ec484608c locking, kprobes:... |
1811 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1812 |
|
4c4308cb9 kprobes: kretprob... |
1813 1814 |
ri->rp = rp; ri->task = current; |
f47cd9b55 kprobes: kretprob... |
1815 |
|
55ca6140e kprobes: fix a me... |
1816 1817 1818 1819 |
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... |
1820 |
return 0; |
55ca6140e kprobes: fix a me... |
1821 |
} |
f47cd9b55 kprobes: kretprob... |
1822 |
|
4c4308cb9 kprobes: kretprob... |
1823 1824 1825 |
arch_prepare_kretprobe(ri, regs); /* XXX(hch): why is there no hlist_move_head? */ |
ef53d9c5e kprobes: improve ... |
1826 1827 1828 1829 1830 |
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... |
1831 |
rp->nmissed++; |
ec484608c locking, kprobes:... |
1832 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1833 |
} |
e65cefe87 [PATCH] kernel/kp... |
1834 1835 |
return 0; } |
820aede02 kprobes: Use NOKP... |
1836 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
e65cefe87 [PATCH] kernel/kp... |
1837 |
|
659b957f2 kprobes: Rename [... |
1838 |
bool __weak arch_kprobe_on_func_entry(unsigned long offset) |
90ec5e89e kretprobes: Ensur... |
1839 1840 1841 |
{ return !offset; } |
659b957f2 kprobes: Rename [... |
1842 |
bool kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset) |
1d585e709 trace/kprobes: Fi... |
1843 1844 1845 1846 1847 1848 1849 |
{ 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 [... |
1850 |
!arch_kprobe_on_func_entry(offset)) |
1d585e709 trace/kprobes: Fi... |
1851 1852 1853 1854 |
return false; return true; } |
55479f647 kprobes: Allow pr... |
1855 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1856 1857 1858 1859 |
{ int ret = 0; struct kretprobe_instance *inst; int i; |
b2a5cd693 kprobes: fix a nu... |
1860 |
void *addr; |
90ec5e89e kretprobes: Ensur... |
1861 |
|
659b957f2 kprobes: Rename [... |
1862 |
if (!kprobe_on_func_entry(rp->kp.addr, rp->kp.symbol_name, rp->kp.offset)) |
90ec5e89e kretprobes: Ensur... |
1863 |
return -EINVAL; |
f438d914b kprobes: support ... |
1864 1865 |
if (kretprobe_blacklist_size) { |
b2a5cd693 kprobes: fix a nu... |
1866 |
addr = kprobe_addr(&rp->kp); |
bc81d48d1 kprobes: Return -... |
1867 1868 |
if (IS_ERR(addr)) return PTR_ERR(addr); |
f438d914b kprobes: support ... |
1869 1870 1871 1872 1873 1874 |
for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { if (kretprobe_blacklist[i].addr == addr) return -EINVAL; } } |
b94cce926 [PATCH] kprobes: ... |
1875 1876 |
rp->kp.pre_handler = pre_handler_kretprobe; |
7522a8423 [PATCH] kprobes: ... |
1877 1878 1879 |
rp->kp.post_handler = NULL; rp->kp.fault_handler = NULL; rp->kp.break_handler = NULL; |
b94cce926 [PATCH] kprobes: ... |
1880 1881 1882 1883 |
/* Pre-allocate memory for max kretprobe instances */ if (rp->maxactive <= 0) { #ifdef CONFIG_PREEMPT |
c2ef6661c kprobes: Fix dist... |
1884 |
rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus()); |
b94cce926 [PATCH] kprobes: ... |
1885 |
#else |
4dae560f9 kprobes: Sanitize... |
1886 |
rp->maxactive = num_possible_cpus(); |
b94cce926 [PATCH] kprobes: ... |
1887 1888 |
#endif } |
ec484608c locking, kprobes:... |
1889 |
raw_spin_lock_init(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1890 1891 |
INIT_HLIST_HEAD(&rp->free_instances); for (i = 0; i < rp->maxactive; i++) { |
f47cd9b55 kprobes: kretprob... |
1892 1893 |
inst = kmalloc(sizeof(struct kretprobe_instance) + rp->data_size, GFP_KERNEL); |
b94cce926 [PATCH] kprobes: ... |
1894 1895 1896 1897 |
if (inst == NULL) { free_rp_inst(rp); return -ENOMEM; } |
ef53d9c5e kprobes: improve ... |
1898 1899 |
INIT_HLIST_NODE(&inst->hlist); hlist_add_head(&inst->hlist, &rp->free_instances); |
b94cce926 [PATCH] kprobes: ... |
1900 1901 1902 1903 |
} rp->nmissed = 0; /* Establish function entry probe point */ |
49ad2fd76 kprobes: remove c... |
1904 |
ret = register_kprobe(&rp->kp); |
4a296e07c kprobes: add (un)... |
1905 |
if (ret != 0) |
b94cce926 [PATCH] kprobes: ... |
1906 1907 1908 |
free_rp_inst(rp); return ret; } |
99081ab55 kprobes: move EXP... |
1909 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1910 |
|
55479f647 kprobes: Allow pr... |
1911 |
int register_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1912 1913 1914 1915 1916 1917 |
{ int ret = 0, i; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1918 |
ret = register_kretprobe(rps[i]); |
67dddaad5 kprobes: fix erro... |
1919 1920 1921 |
if (ret < 0) { if (i > 0) unregister_kretprobes(rps, i); |
4a296e07c kprobes: add (un)... |
1922 1923 1924 1925 1926 |
break; } } return ret; } |
99081ab55 kprobes: move EXP... |
1927 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
4a296e07c kprobes: add (un)... |
1928 |
|
55479f647 kprobes: Allow pr... |
1929 |
void unregister_kretprobe(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1930 1931 1932 |
{ unregister_kretprobes(&rp, 1); } |
99081ab55 kprobes: move EXP... |
1933 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
4a296e07c kprobes: add (un)... |
1934 |
|
55479f647 kprobes: Allow pr... |
1935 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 |
{ 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); synchronize_sched(); 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... |
1955 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4a296e07c kprobes: add (un)... |
1956 |
|
9edddaa20 Kprobes: indicate... |
1957 |
#else /* CONFIG_KRETPROBES */ |
55479f647 kprobes: Allow pr... |
1958 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1959 1960 1961 |
{ return -ENOSYS; } |
99081ab55 kprobes: move EXP... |
1962 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1963 |
|
55479f647 kprobes: Allow pr... |
1964 |
int register_kretprobes(struct kretprobe **rps, int num) |
346fd59ba [PATCH] kprobes: ... |
1965 |
{ |
4a296e07c kprobes: add (un)... |
1966 |
return -ENOSYS; |
346fd59ba [PATCH] kprobes: ... |
1967 |
} |
99081ab55 kprobes: move EXP... |
1968 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
55479f647 kprobes: Allow pr... |
1969 |
void unregister_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1970 |
{ |
4a296e07c kprobes: add (un)... |
1971 |
} |
99081ab55 kprobes: move EXP... |
1972 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1973 |
|
55479f647 kprobes: Allow pr... |
1974 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1975 1976 |
{ } |
99081ab55 kprobes: move EXP... |
1977 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4c4308cb9 kprobes: kretprob... |
1978 |
|
820aede02 kprobes: Use NOKP... |
1979 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
4a296e07c kprobes: add (un)... |
1980 1981 |
{ return 0; |
b94cce926 [PATCH] kprobes: ... |
1982 |
} |
820aede02 kprobes: Use NOKP... |
1983 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1984 |
|
4a296e07c kprobes: add (un)... |
1985 |
#endif /* CONFIG_KRETPROBES */ |
e8386a0cb kprobes: support ... |
1986 |
/* Set the kprobe gone and remove its instruction buffer. */ |
55479f647 kprobes: Allow pr... |
1987 |
static void kill_kprobe(struct kprobe *p) |
e8386a0cb kprobes: support ... |
1988 1989 |
{ struct kprobe *kp; |
de5bd88d5 kprobes: support ... |
1990 |
|
e8386a0cb kprobes: support ... |
1991 |
p->flags |= KPROBE_FLAG_GONE; |
afd66255b kprobes: Introduc... |
1992 |
if (kprobe_aggrprobe(p)) { |
e8386a0cb kprobes: support ... |
1993 1994 1995 1996 1997 1998 1999 2000 |
/* * 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; p->break_handler = NULL; |
afd66255b kprobes: Introduc... |
2001 |
kill_optimized_kprobe(p); |
e8386a0cb kprobes: support ... |
2002 2003 2004 2005 2006 2007 2008 |
} /* * 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); } |
c0614829c kprobes: Move ena... |
2009 |
/* Disable one kprobe */ |
55479f647 kprobes: Allow pr... |
2010 |
int disable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
2011 2012 |
{ int ret = 0; |
c0614829c kprobes: Move ena... |
2013 2014 |
mutex_lock(&kprobe_mutex); |
6f0f1dd71 kprobes: Cleanup ... |
2015 2016 |
/* Disable this kprobe */ if (__disable_kprobe(kp) == NULL) |
c0614829c kprobes: Move ena... |
2017 |
ret = -EINVAL; |
c0614829c kprobes: Move ena... |
2018 |
|
c0614829c kprobes: Move ena... |
2019 2020 2021 2022 2023 2024 |
mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(disable_kprobe); /* Enable one kprobe */ |
55479f647 kprobes: Allow pr... |
2025 |
int enable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 |
{ 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; arm_kprobe(p); } out: mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(enable_kprobe); |
820aede02 kprobes: Use NOKP... |
2057 |
void dump_kprobe(struct kprobe *kp) |
24851d244 tracing/kprobes: ... |
2058 2059 2060 2061 2062 2063 2064 2065 2066 |
{ printk(KERN_WARNING "Dumping kprobe: "); printk(KERN_WARNING "Name: %s Address: %p Offset: %x ", kp->symbol_name, kp->addr, kp->offset); } |
820aede02 kprobes: Use NOKP... |
2067 |
NOKPROBE_SYMBOL(dump_kprobe); |
24851d244 tracing/kprobes: ... |
2068 |
|
376e24242 kprobes: Introduc... |
2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 |
/* * 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) { unsigned long *iter; struct kprobe_blacklist_entry *ent; |
d81b4253b kprobes: Fix "Fai... |
2082 |
unsigned long entry, offset = 0, size = 0; |
376e24242 kprobes: Introduc... |
2083 2084 |
for (iter = start; iter < end; iter++) { |
d81b4253b kprobes: Fix "Fai... |
2085 2086 2087 2088 2089 2090 2091 |
entry = arch_deref_entry_point((void *)*iter); if (!kernel_text_address(entry) || !kallsyms_lookup_size_offset(entry, &size, &offset)) { pr_err("Failed to find blacklist at %p ", (void *)entry); |
376e24242 kprobes: Introduc... |
2092 2093 2094 2095 2096 2097 |
continue; } ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; |
d81b4253b kprobes: Fix "Fai... |
2098 2099 |
ent->start_addr = entry; ent->end_addr = entry + size; |
376e24242 kprobes: Introduc... |
2100 2101 2102 2103 2104 |
INIT_LIST_HEAD(&ent->list); list_add_tail(&ent->list, &kprobe_blacklist); } return 0; } |
e8386a0cb kprobes: support ... |
2105 |
/* Module notifier call back, checking kprobes on the module */ |
55479f647 kprobes: Allow pr... |
2106 2107 |
static int kprobes_module_callback(struct notifier_block *nb, unsigned long val, void *data) |
e8386a0cb kprobes: support ... |
2108 2109 2110 |
{ struct module *mod = data; struct hlist_head *head; |
e8386a0cb kprobes: support ... |
2111 2112 |
struct kprobe *p; unsigned int i; |
f24659d96 kprobes: support ... |
2113 |
int checkcore = (val == MODULE_STATE_GOING); |
e8386a0cb kprobes: support ... |
2114 |
|
f24659d96 kprobes: support ... |
2115 |
if (val != MODULE_STATE_GOING && val != MODULE_STATE_LIVE) |
e8386a0cb kprobes: support ... |
2116 2117 2118 |
return NOTIFY_DONE; /* |
f24659d96 kprobes: support ... |
2119 2120 2121 2122 |
* 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 ... |
2123 2124 2125 2126 |
*/ mutex_lock(&kprobe_mutex); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2127 |
hlist_for_each_entry_rcu(p, head, hlist) |
f24659d96 kprobes: support ... |
2128 2129 2130 |
if (within_module_init((unsigned long)p->addr, mod) || (checkcore && within_module_core((unsigned long)p->addr, mod))) { |
e8386a0cb kprobes: support ... |
2131 2132 2133 2134 |
/* * 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... |
2135 2136 2137 2138 2139 2140 |
* * 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 ... |
2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 |
*/ kill_kprobe(p); } } mutex_unlock(&kprobe_mutex); return NOTIFY_DONE; } static struct notifier_block kprobe_module_nb = { .notifier_call = kprobes_module_callback, .priority = 0 }; |
376e24242 kprobes: Introduc... |
2153 2154 2155 |
/* Markers of _kprobe_blacklist section */ extern unsigned long __start_kprobe_blacklist[]; extern unsigned long __stop_kprobe_blacklist[]; |
1da177e4c Linux-2.6.12-rc2 |
2156 2157 2158 2159 2160 2161 |
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: ... |
2162 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { |
1da177e4c Linux-2.6.12-rc2 |
2163 |
INIT_HLIST_HEAD(&kprobe_table[i]); |
b94cce926 [PATCH] kprobes: ... |
2164 |
INIT_HLIST_HEAD(&kretprobe_inst_table[i]); |
ec484608c locking, kprobes:... |
2165 |
raw_spin_lock_init(&(kretprobe_table_locks[i].lock)); |
b94cce926 [PATCH] kprobes: ... |
2166 |
} |
1da177e4c Linux-2.6.12-rc2 |
2167 |
|
376e24242 kprobes: Introduc... |
2168 2169 2170 2171 2172 2173 2174 |
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 ... |
2175 |
} |
f438d914b kprobes: support ... |
2176 2177 2178 |
if (kretprobe_blacklist_size) { /* lookup the function address from its name */ for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { |
49e0b4658 kprobes: Convert ... |
2179 |
kretprobe_blacklist[i].addr = |
290e30707 powerpc/kprobes: ... |
2180 |
kprobe_lookup_name(kretprobe_blacklist[i].name, 0); |
f438d914b kprobes: support ... |
2181 2182 2183 2184 2185 2186 |
if (!kretprobe_blacklist[i].addr) printk("kretprobe: lookup failed: %s ", kretprobe_blacklist[i].name); } } |
b2be84df9 kprobes: Jump opt... |
2187 2188 |
#if defined(CONFIG_OPTPROBES) #if defined(__ARCH_WANT_KPROBES_INSN_SLOT) |
afd66255b kprobes: Introduc... |
2189 2190 2191 |
/* Init kprobe_optinsn_slots */ kprobe_optinsn_slots.insn_size = MAX_OPTINSN_SIZE; #endif |
b2be84df9 kprobes: Jump opt... |
2192 2193 2194 |
/* By default, kprobes can be optimized */ kprobes_allow_optimization = true; #endif |
afd66255b kprobes: Introduc... |
2195 |
|
e579abeb5 kprobes: rename k... |
2196 2197 |
/* By default, kprobes are armed */ kprobes_all_disarmed = false; |
bf8f6e5b3 Kprobes: The ON/O... |
2198 |
|
6772926be [PATCH] kprobes: ... |
2199 |
err = arch_init_kprobes(); |
802eae7c8 [PATCH] Return pr... |
2200 2201 |
if (!err) err = register_die_notifier(&kprobe_exceptions_nb); |
e8386a0cb kprobes: support ... |
2202 2203 |
if (!err) err = register_module_notifier(&kprobe_module_nb); |
ef53d9c5e kprobes: improve ... |
2204 |
kprobes_initialized = (err == 0); |
802eae7c8 [PATCH] Return pr... |
2205 |
|
8c1c93564 x86: kprobes: add... |
2206 2207 |
if (!err) init_test_probes(); |
1da177e4c Linux-2.6.12-rc2 |
2208 2209 |
return err; } |
346fd59ba [PATCH] kprobes: ... |
2210 |
#ifdef CONFIG_DEBUG_FS |
55479f647 kprobes: Allow pr... |
2211 |
static void report_probe(struct seq_file *pi, struct kprobe *p, |
afd66255b kprobes: Introduc... |
2212 |
const char *sym, int offset, char *modname, struct kprobe *pp) |
346fd59ba [PATCH] kprobes: ... |
2213 2214 2215 2216 2217 2218 2219 2220 2221 |
{ char *kprobe_type; if (p->pre_handler == pre_handler_kretprobe) kprobe_type = "r"; else if (p->pre_handler == setjmp_pre_handler) kprobe_type = "j"; else kprobe_type = "k"; |
afd66255b kprobes: Introduc... |
2222 |
|
346fd59ba [PATCH] kprobes: ... |
2223 |
if (sym) |
afd66255b kprobes: Introduc... |
2224 |
seq_printf(pi, "%p %s %s+0x%x %s ", |
de5bd88d5 kprobes: support ... |
2225 |
p->addr, kprobe_type, sym, offset, |
afd66255b kprobes: Introduc... |
2226 |
(modname ? modname : " ")); |
346fd59ba [PATCH] kprobes: ... |
2227 |
else |
afd66255b kprobes: Introduc... |
2228 2229 2230 2231 2232 |
seq_printf(pi, "%p %s %p ", p->addr, kprobe_type, p->addr); if (!pp) pp = p; |
ae6aa16fd kprobes: introduc... |
2233 2234 |
seq_printf(pi, "%s%s%s%s ", |
afd66255b kprobes: Introduc... |
2235 2236 |
(kprobe_gone(p) ? "[GONE]" : ""), ((kprobe_disabled(p) && !kprobe_gone(p)) ? "[DISABLED]" : ""), |
ae6aa16fd kprobes: introduc... |
2237 2238 |
(kprobe_optimized(pp) ? "[OPTIMIZED]" : ""), (kprobe_ftrace(pp) ? "[FTRACE]" : "")); |
346fd59ba [PATCH] kprobes: ... |
2239 |
} |
55479f647 kprobes: Allow pr... |
2240 |
static void *kprobe_seq_start(struct seq_file *f, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2241 2242 2243 |
{ return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL; } |
55479f647 kprobes: Allow pr... |
2244 |
static void *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2245 2246 2247 2248 2249 2250 |
{ (*pos)++; if (*pos >= KPROBE_TABLE_SIZE) return NULL; return pos; } |
55479f647 kprobes: Allow pr... |
2251 |
static void kprobe_seq_stop(struct seq_file *f, void *v) |
346fd59ba [PATCH] kprobes: ... |
2252 2253 2254 |
{ /* Nothing to do */ } |
55479f647 kprobes: Allow pr... |
2255 |
static int show_kprobe_addr(struct seq_file *pi, void *v) |
346fd59ba [PATCH] kprobes: ... |
2256 2257 |
{ struct hlist_head *head; |
346fd59ba [PATCH] kprobes: ... |
2258 2259 2260 |
struct kprobe *p, *kp; const char *sym = NULL; unsigned int i = *(loff_t *) v; |
ffb451227 Simplify kallsyms... |
2261 |
unsigned long offset = 0; |
ab7678656 kprobes: use KSYM... |
2262 |
char *modname, namebuf[KSYM_NAME_LEN]; |
346fd59ba [PATCH] kprobes: ... |
2263 2264 2265 |
head = &kprobe_table[i]; preempt_disable(); |
b67bfe0d4 hlist: drop the n... |
2266 |
hlist_for_each_entry_rcu(p, head, hlist) { |
ffb451227 Simplify kallsyms... |
2267 |
sym = kallsyms_lookup((unsigned long)p->addr, NULL, |
346fd59ba [PATCH] kprobes: ... |
2268 |
&offset, &modname, namebuf); |
afd66255b kprobes: Introduc... |
2269 |
if (kprobe_aggrprobe(p)) { |
346fd59ba [PATCH] kprobes: ... |
2270 |
list_for_each_entry_rcu(kp, &p->list, list) |
afd66255b kprobes: Introduc... |
2271 |
report_probe(pi, kp, sym, offset, modname, p); |
346fd59ba [PATCH] kprobes: ... |
2272 |
} else |
afd66255b kprobes: Introduc... |
2273 |
report_probe(pi, p, sym, offset, modname, NULL); |
346fd59ba [PATCH] kprobes: ... |
2274 2275 2276 2277 |
} preempt_enable(); return 0; } |
88e9d34c7 seq_file: constif... |
2278 |
static const struct seq_operations kprobes_seq_ops = { |
346fd59ba [PATCH] kprobes: ... |
2279 2280 2281 2282 2283 |
.start = kprobe_seq_start, .next = kprobe_seq_next, .stop = kprobe_seq_stop, .show = show_kprobe_addr }; |
55479f647 kprobes: Allow pr... |
2284 |
static int kprobes_open(struct inode *inode, struct file *filp) |
346fd59ba [PATCH] kprobes: ... |
2285 2286 2287 |
{ return seq_open(filp, &kprobes_seq_ops); } |
828c09509 const: constify r... |
2288 |
static const struct file_operations debugfs_kprobes_operations = { |
346fd59ba [PATCH] kprobes: ... |
2289 2290 2291 2292 2293 |
.open = kprobes_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
637247403 kprobes: Show bla... |
2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 |
/* 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); seq_printf(m, "0x%p-0x%p\t%ps ", (void *)ent->start_addr, (void *)ent->end_addr, (void *)ent->start_addr); 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, }; |
55479f647 kprobes: Allow pr... |
2334 |
static void arm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2335 2336 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2337 2338 2339 2340 |
struct kprobe *p; unsigned int i; mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2341 2342 |
/* If kprobes are armed, just return */ if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2343 |
goto already_enabled; |
977ad481b kprobes: set kpro... |
2344 2345 2346 2347 2348 2349 |
/* * 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... |
2350 |
/* Arming kprobes doesn't optimize kprobe itself */ |
bf8f6e5b3 Kprobes: The ON/O... |
2351 2352 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2353 |
hlist_for_each_entry_rcu(p, head, hlist) |
de5bd88d5 kprobes: support ... |
2354 |
if (!kprobe_disabled(p)) |
ae6aa16fd kprobes: introduc... |
2355 |
arm_kprobe(p); |
bf8f6e5b3 Kprobes: The ON/O... |
2356 |
} |
bf8f6e5b3 Kprobes: The ON/O... |
2357 2358 2359 2360 2361 2362 2363 |
printk(KERN_INFO "Kprobes globally enabled "); already_enabled: mutex_unlock(&kprobe_mutex); return; } |
55479f647 kprobes: Allow pr... |
2364 |
static void disarm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2365 2366 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2367 2368 2369 2370 |
struct kprobe *p; unsigned int i; mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2371 |
/* If kprobes are already disarmed, just return */ |
6274de498 kprobes: Support ... |
2372 2373 2374 2375 |
if (kprobes_all_disarmed) { mutex_unlock(&kprobe_mutex); return; } |
bf8f6e5b3 Kprobes: The ON/O... |
2376 |
|
e579abeb5 kprobes: rename k... |
2377 |
kprobes_all_disarmed = true; |
bf8f6e5b3 Kprobes: The ON/O... |
2378 2379 |
printk(KERN_INFO "Kprobes globally disabled "); |
afd66255b kprobes: Introduc... |
2380 |
|
bf8f6e5b3 Kprobes: The ON/O... |
2381 2382 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2383 |
hlist_for_each_entry_rcu(p, head, hlist) { |
de5bd88d5 kprobes: support ... |
2384 |
if (!arch_trampoline_kprobe(p) && !kprobe_disabled(p)) |
ae6aa16fd kprobes: introduc... |
2385 |
disarm_kprobe(p, false); |
bf8f6e5b3 Kprobes: The ON/O... |
2386 2387 |
} } |
bf8f6e5b3 Kprobes: The ON/O... |
2388 |
mutex_unlock(&kprobe_mutex); |
bf8f6e5b3 Kprobes: The ON/O... |
2389 |
|
6274de498 kprobes: Support ... |
2390 2391 |
/* Wait for disarming all kprobes by optimizer */ wait_for_kprobe_optimizer(); |
bf8f6e5b3 Kprobes: The ON/O... |
2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 |
} /* * 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... |
2403 |
if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 |
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 ... |
2417 |
size_t buf_size; |
bf8f6e5b3 Kprobes: The ON/O... |
2418 2419 2420 2421 |
buf_size = min(count, (sizeof(buf)-1)); if (copy_from_user(buf, user_buf, buf_size)) return -EFAULT; |
10fb46d5f kprobes: handle e... |
2422 |
buf[buf_size] = '\0'; |
bf8f6e5b3 Kprobes: The ON/O... |
2423 2424 2425 2426 |
switch (buf[0]) { case 'y': case 'Y': case '1': |
e579abeb5 kprobes: rename k... |
2427 |
arm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2428 2429 2430 2431 |
break; case 'n': case 'N': case '0': |
e579abeb5 kprobes: rename k... |
2432 |
disarm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2433 |
break; |
10fb46d5f kprobes: handle e... |
2434 2435 |
default: return -EINVAL; |
bf8f6e5b3 Kprobes: The ON/O... |
2436 2437 2438 2439 |
} return count; } |
828c09509 const: constify r... |
2440 |
static const struct file_operations fops_kp = { |
bf8f6e5b3 Kprobes: The ON/O... |
2441 2442 |
.read = read_enabled_file_bool, .write = write_enabled_file_bool, |
6038f373a llseek: automatic... |
2443 |
.llseek = default_llseek, |
bf8f6e5b3 Kprobes: The ON/O... |
2444 |
}; |
55479f647 kprobes: Allow pr... |
2445 |
static int __init debugfs_kprobe_init(void) |
346fd59ba [PATCH] kprobes: ... |
2446 2447 |
{ struct dentry *dir, *file; |
bf8f6e5b3 Kprobes: The ON/O... |
2448 |
unsigned int value = 1; |
346fd59ba [PATCH] kprobes: ... |
2449 2450 2451 2452 |
dir = debugfs_create_dir("kprobes", NULL); if (!dir) return -ENOMEM; |
4bdf9c175 kprobes: Make lis... |
2453 |
file = debugfs_create_file("list", 0400, dir, NULL, |
346fd59ba [PATCH] kprobes: ... |
2454 |
&debugfs_kprobes_operations); |
637247403 kprobes: Show bla... |
2455 2456 |
if (!file) goto error; |
346fd59ba [PATCH] kprobes: ... |
2457 |
|
bf8f6e5b3 Kprobes: The ON/O... |
2458 2459 |
file = debugfs_create_file("enabled", 0600, dir, &value, &fops_kp); |
637247403 kprobes: Show bla... |
2460 2461 |
if (!file) goto error; |
4bdf9c175 kprobes: Make lis... |
2462 |
file = debugfs_create_file("blacklist", 0400, dir, NULL, |
637247403 kprobes: Show bla... |
2463 2464 2465 |
&debugfs_kprobe_blacklist_ops); if (!file) goto error; |
bf8f6e5b3 Kprobes: The ON/O... |
2466 |
|
346fd59ba [PATCH] kprobes: ... |
2467 |
return 0; |
637247403 kprobes: Show bla... |
2468 2469 2470 2471 |
error: debugfs_remove(dir); return -ENOMEM; |
346fd59ba [PATCH] kprobes: ... |
2472 2473 2474 2475 2476 2477 |
} late_initcall(debugfs_kprobe_init); #endif /* CONFIG_DEBUG_FS */ module_init(init_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
2478 |
|
99081ab55 kprobes: move EXP... |
2479 |
/* defined in arch/.../kernel/kprobes.c */ |
1da177e4c Linux-2.6.12-rc2 |
2480 |
EXPORT_SYMBOL_GPL(jprobe_return); |