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kernel/kprobes.c
62.8 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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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... |
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 |
/* Cancel unoptimizing for reusing */ static void reuse_unused_kprobe(struct kprobe *ap) { struct optimized_kprobe *op; 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) */ BUG_ON(!kprobe_optready(ap)); optimize_kprobe(ap); } |
afd66255b kprobes: Introduc... |
693 |
/* Remove optimized instructions */ |
55479f647 kprobes: Allow pr... |
694 |
static void kill_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
695 696 697 698 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
6274de498 kprobes: Support ... |
699 700 |
if (!list_empty(&op->list)) /* Dequeue from the (un)optimization queue */ |
afd66255b kprobes: Introduc... |
701 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
702 |
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
7b959fc58 kprobes: Fix to f... |
703 704 705 706 707 708 709 710 711 712 713 |
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 ... |
714 |
/* Don't touch the code, because it is already freed. */ |
afd66255b kprobes: Introduc... |
715 716 |
arch_remove_optimized_kprobe(op); } |
a460246c7 kprobes: Skip pre... |
717 718 719 720 721 722 |
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... |
723 |
/* Try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
724 |
static void prepare_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
725 726 727 728 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
a460246c7 kprobes: Skip pre... |
729 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
730 |
} |
afd66255b kprobes: Introduc... |
731 |
/* Allocate new optimized_kprobe and try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
732 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
733 734 735 736 737 738 739 740 741 |
{ 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... |
742 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
743 744 745 |
return &op->kp; } |
55479f647 kprobes: Allow pr... |
746 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p); |
afd66255b kprobes: Introduc... |
747 748 749 750 751 |
/* * Prepare an optimized_kprobe and optimize it * NOTE: p must be a normal registered kprobe */ |
55479f647 kprobes: Allow pr... |
752 |
static void try_to_optimize_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
753 754 755 |
{ struct kprobe *ap; struct optimized_kprobe *op; |
ae6aa16fd kprobes: introduc... |
756 757 758 |
/* Impossible to optimize ftrace-based kprobe */ if (kprobe_ftrace(p)) return; |
25764288d kprobes: Move loc... |
759 |
/* For preparing optimization, jump_label_text_reserved() is called */ |
2d1e38f56 kprobes: Cure hot... |
760 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
761 762 |
jump_label_lock(); mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
763 764 |
ap = alloc_aggr_kprobe(p); if (!ap) |
25764288d kprobes: Move loc... |
765 |
goto out; |
afd66255b kprobes: Introduc... |
766 767 768 769 |
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 ... |
770 771 |
arch_remove_optimized_kprobe(op); kfree(op); |
25764288d kprobes: Move loc... |
772 |
goto out; |
afd66255b kprobes: Introduc... |
773 774 775 |
} init_aggr_kprobe(ap, p); |
25764288d kprobes: Move loc... |
776 777 778 779 780 |
optimize_kprobe(ap); /* This just kicks optimizer thread */ out: mutex_unlock(&text_mutex); jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
781 |
cpus_read_unlock(); |
afd66255b kprobes: Introduc... |
782 |
} |
b2be84df9 kprobes: Jump opt... |
783 |
#ifdef CONFIG_SYSCTL |
55479f647 kprobes: Allow pr... |
784 |
static void optimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
785 786 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
787 788 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
789 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
790 791 |
/* If optimization is already allowed, just return */ if (kprobes_allow_optimization) |
5c51543b0 kprobes: Fix a do... |
792 |
goto out; |
b2be84df9 kprobes: Jump opt... |
793 |
|
2d1e38f56 kprobes: Cure hot... |
794 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
795 |
kprobes_allow_optimization = true; |
b2be84df9 kprobes: Jump opt... |
796 797 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
798 |
hlist_for_each_entry_rcu(p, head, hlist) |
b2be84df9 kprobes: Jump opt... |
799 800 801 |
if (!kprobe_disabled(p)) optimize_kprobe(p); } |
2d1e38f56 kprobes: Cure hot... |
802 |
cpus_read_unlock(); |
b2be84df9 kprobes: Jump opt... |
803 804 |
printk(KERN_INFO "Kprobes globally optimized "); |
5c51543b0 kprobes: Fix a do... |
805 806 |
out: mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
807 |
} |
55479f647 kprobes: Allow pr... |
808 |
static void unoptimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
809 810 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
811 812 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
813 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
814 |
/* If optimization is already prohibited, just return */ |
5c51543b0 kprobes: Fix a do... |
815 816 |
if (!kprobes_allow_optimization) { mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
817 |
return; |
5c51543b0 kprobes: Fix a do... |
818 |
} |
b2be84df9 kprobes: Jump opt... |
819 |
|
2d1e38f56 kprobes: Cure hot... |
820 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
821 |
kprobes_allow_optimization = false; |
b2be84df9 kprobes: Jump opt... |
822 823 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
824 |
hlist_for_each_entry_rcu(p, head, hlist) { |
b2be84df9 kprobes: Jump opt... |
825 |
if (!kprobe_disabled(p)) |
6274de498 kprobes: Support ... |
826 |
unoptimize_kprobe(p, false); |
b2be84df9 kprobes: Jump opt... |
827 828 |
} } |
2d1e38f56 kprobes: Cure hot... |
829 |
cpus_read_unlock(); |
5c51543b0 kprobes: Fix a do... |
830 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
831 832 833 834 |
/* Wait for unoptimizing completion */ wait_for_kprobe_optimizer(); printk(KERN_INFO "Kprobes globally unoptimized "); |
b2be84df9 kprobes: Jump opt... |
835 |
} |
5c51543b0 kprobes: Fix a do... |
836 |
static DEFINE_MUTEX(kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
837 838 839 840 841 842 |
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... |
843 |
mutex_lock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
844 845 846 847 848 849 850 |
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... |
851 |
mutex_unlock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
852 853 854 855 |
return ret; } #endif /* CONFIG_SYSCTL */ |
6274de498 kprobes: Support ... |
856 |
/* Put a breakpoint for a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
857 |
static void __arm_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
858 |
{ |
6d8e40a85 kprobes: Rename o... |
859 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
860 861 |
/* Check collision with other optimized kprobes */ |
6d8e40a85 kprobes: Rename o... |
862 863 |
_p = get_optimized_kprobe((unsigned long)p->addr); if (unlikely(_p)) |
6274de498 kprobes: Support ... |
864 865 |
/* Fallback to unoptimized kprobe */ unoptimize_kprobe(_p, true); |
afd66255b kprobes: Introduc... |
866 867 868 869 |
arch_arm_kprobe(p); optimize_kprobe(p); /* Try to optimize (add kprobe to a list) */ } |
6274de498 kprobes: Support ... |
870 |
/* Remove the breakpoint of a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
871 |
static void __disarm_kprobe(struct kprobe *p, bool reopt) |
afd66255b kprobes: Introduc... |
872 |
{ |
6d8e40a85 kprobes: Rename o... |
873 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
874 |
|
69d54b916 kprobes: makes kp... |
875 876 |
/* Try to unoptimize */ unoptimize_kprobe(p, kprobes_all_disarmed); |
afd66255b kprobes: Introduc... |
877 |
|
6274de498 kprobes: Support ... |
878 879 880 881 882 883 884 885 |
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... |
886 887 888 889 890 |
} #else /* !CONFIG_OPTPROBES */ #define optimize_kprobe(p) do {} while (0) |
6274de498 kprobes: Support ... |
891 |
#define unoptimize_kprobe(p, f) do {} while (0) |
afd66255b kprobes: Introduc... |
892 893 894 895 |
#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 ... |
896 897 898 |
#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... |
899 |
|
0490cd1f9 kprobes: Reuse un... |
900 901 902 903 904 905 906 |
/* There should be no unused kprobes can be reused without optimization */ static void reuse_unused_kprobe(struct kprobe *ap) { printk(KERN_ERR "Error: There should be no unused kprobe here. "); BUG_ON(kprobe_unused(ap)); } |
55479f647 kprobes: Allow pr... |
907 |
static void free_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
908 |
{ |
6274de498 kprobes: Support ... |
909 |
arch_remove_kprobe(p); |
afd66255b kprobes: Introduc... |
910 911 |
kfree(p); } |
55479f647 kprobes: Allow pr... |
912 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
913 914 915 916 |
{ return kzalloc(sizeof(struct kprobe), GFP_KERNEL); } #endif /* CONFIG_OPTPROBES */ |
e7dbfe349 kprobes/x86: Move... |
917 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
918 |
static struct ftrace_ops kprobe_ftrace_ops __read_mostly = { |
e52538965 kprobes/x86: ftra... |
919 |
.func = kprobe_ftrace_handler, |
1d70be34d kprobes: Add IPMO... |
920 |
.flags = FTRACE_OPS_FL_SAVE_REGS | FTRACE_OPS_FL_IPMODIFY, |
ae6aa16fd kprobes: introduc... |
921 922 923 924 |
}; static int kprobe_ftrace_enabled; /* Must ensure p->addr is really on ftrace */ |
55479f647 kprobes: Allow pr... |
925 |
static int prepare_kprobe(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
926 927 928 929 930 931 932 933 |
{ if (!kprobe_ftrace(p)) return arch_prepare_kprobe(p); return arch_prepare_kprobe_ftrace(p); } /* Caller must lock kprobe_mutex */ |
55479f647 kprobes: Allow pr... |
934 |
static void arm_kprobe_ftrace(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 |
{ 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... |
951 |
static void disarm_kprobe_ftrace(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
952 953 954 955 956 957 958 959 960 961 962 963 964 965 |
{ 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... |
966 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
967 968 969 970 |
#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... |
971 |
/* Arm a kprobe with text_mutex */ |
55479f647 kprobes: Allow pr... |
972 |
static void arm_kprobe(struct kprobe *kp) |
201517a7f kprobes: fix to u... |
973 |
{ |
ae6aa16fd kprobes: introduc... |
974 975 976 977 |
if (unlikely(kprobe_ftrace(kp))) { arm_kprobe_ftrace(kp); return; } |
2d1e38f56 kprobes: Cure hot... |
978 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
979 |
mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
980 |
__arm_kprobe(kp); |
201517a7f kprobes: fix to u... |
981 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
982 |
cpus_read_unlock(); |
201517a7f kprobes: fix to u... |
983 984 985 |
} /* Disarm a kprobe with text_mutex */ |
55479f647 kprobes: Allow pr... |
986 |
static void disarm_kprobe(struct kprobe *kp, bool reopt) |
201517a7f kprobes: fix to u... |
987 |
{ |
ae6aa16fd kprobes: introduc... |
988 989 990 991 |
if (unlikely(kprobe_ftrace(kp))) { disarm_kprobe_ftrace(kp); return; } |
2d1e38f56 kprobes: Cure hot... |
992 993 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
994 |
mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
995 |
__disarm_kprobe(kp, reopt); |
201517a7f kprobes: fix to u... |
996 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
997 |
cpus_read_unlock(); |
201517a7f kprobes: fix to u... |
998 |
} |
64f562c6d [PATCH] kprobes: ... |
999 1000 1001 1002 |
/* * Aggregate handlers for multiple kprobes support - these handlers * take care of invoking the individual kprobe handlers on p->list */ |
820aede02 kprobes: Use NOKP... |
1003 |
static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs) |
64f562c6d [PATCH] kprobes: ... |
1004 1005 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1006 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1007 |
if (kp->pre_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1008 |
set_kprobe_instance(kp); |
8b0914ea7 [PATCH] jprobes: ... |
1009 1010 |
if (kp->pre_handler(kp, regs)) return 1; |
64f562c6d [PATCH] kprobes: ... |
1011 |
} |
e65845235 [PATCH] Kprobes: ... |
1012 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1013 1014 1015 |
} return 0; } |
820aede02 kprobes: Use NOKP... |
1016 |
NOKPROBE_SYMBOL(aggr_pre_handler); |
64f562c6d [PATCH] kprobes: ... |
1017 |
|
820aede02 kprobes: Use NOKP... |
1018 1019 |
static void aggr_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) |
64f562c6d [PATCH] kprobes: ... |
1020 1021 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1022 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1023 |
if (kp->post_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1024 |
set_kprobe_instance(kp); |
64f562c6d [PATCH] kprobes: ... |
1025 |
kp->post_handler(kp, regs, flags); |
e65845235 [PATCH] Kprobes: ... |
1026 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1027 1028 |
} } |
64f562c6d [PATCH] kprobes: ... |
1029 |
} |
820aede02 kprobes: Use NOKP... |
1030 |
NOKPROBE_SYMBOL(aggr_post_handler); |
64f562c6d [PATCH] kprobes: ... |
1031 |
|
820aede02 kprobes: Use NOKP... |
1032 1033 |
static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs, int trapnr) |
64f562c6d [PATCH] kprobes: ... |
1034 |
{ |
b76834bc1 kprobes: Use this... |
1035 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1036 |
|
64f562c6d [PATCH] kprobes: ... |
1037 1038 1039 1040 |
/* * if we faulted "during" the execution of a user specified * probe handler, invoke just that probe's fault handler */ |
e65845235 [PATCH] Kprobes: ... |
1041 1042 |
if (cur && cur->fault_handler) { if (cur->fault_handler(cur, regs, trapnr)) |
64f562c6d [PATCH] kprobes: ... |
1043 1044 1045 1046 |
return 1; } return 0; } |
820aede02 kprobes: Use NOKP... |
1047 |
NOKPROBE_SYMBOL(aggr_fault_handler); |
64f562c6d [PATCH] kprobes: ... |
1048 |
|
820aede02 kprobes: Use NOKP... |
1049 |
static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs) |
8b0914ea7 [PATCH] jprobes: ... |
1050 |
{ |
b76834bc1 kprobes: Use this... |
1051 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1052 1053 1054 1055 1056 |
int ret = 0; if (cur && cur->break_handler) { if (cur->break_handler(cur, regs)) ret = 1; |
8b0914ea7 [PATCH] jprobes: ... |
1057 |
} |
e65845235 [PATCH] Kprobes: ... |
1058 1059 |
reset_kprobe_instance(); return ret; |
8b0914ea7 [PATCH] jprobes: ... |
1060 |
} |
820aede02 kprobes: Use NOKP... |
1061 |
NOKPROBE_SYMBOL(aggr_break_handler); |
8b0914ea7 [PATCH] jprobes: ... |
1062 |
|
bf8d5c52c [PATCH] kprobes: ... |
1063 |
/* Walks the list and increments nmissed count for multiprobe case */ |
820aede02 kprobes: Use NOKP... |
1064 |
void kprobes_inc_nmissed_count(struct kprobe *p) |
bf8d5c52c [PATCH] kprobes: ... |
1065 1066 |
{ struct kprobe *kp; |
afd66255b kprobes: Introduc... |
1067 |
if (!kprobe_aggrprobe(p)) { |
bf8d5c52c [PATCH] kprobes: ... |
1068 1069 1070 1071 1072 1073 1074 |
p->nmissed++; } else { list_for_each_entry_rcu(kp, &p->list, list) kp->nmissed++; } return; } |
820aede02 kprobes: Use NOKP... |
1075 |
NOKPROBE_SYMBOL(kprobes_inc_nmissed_count); |
bf8d5c52c [PATCH] kprobes: ... |
1076 |
|
820aede02 kprobes: Use NOKP... |
1077 1078 |
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head) |
b94cce926 [PATCH] kprobes: ... |
1079 |
{ |
ef53d9c5e kprobes: improve ... |
1080 |
struct kretprobe *rp = ri->rp; |
b94cce926 [PATCH] kprobes: ... |
1081 1082 |
/* remove rp inst off the rprobe_inst_table */ hlist_del(&ri->hlist); |
ef53d9c5e kprobes: improve ... |
1083 1084 |
INIT_HLIST_NODE(&ri->hlist); if (likely(rp)) { |
ec484608c locking, kprobes:... |
1085 |
raw_spin_lock(&rp->lock); |
ef53d9c5e kprobes: improve ... |
1086 |
hlist_add_head(&ri->hlist, &rp->free_instances); |
ec484608c locking, kprobes:... |
1087 |
raw_spin_unlock(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1088 1089 |
} else /* Unregistering */ |
99219a3fb [PATCH] kretprobe... |
1090 |
hlist_add_head(&ri->hlist, head); |
b94cce926 [PATCH] kprobes: ... |
1091 |
} |
820aede02 kprobes: Use NOKP... |
1092 |
NOKPROBE_SYMBOL(recycle_rp_inst); |
b94cce926 [PATCH] kprobes: ... |
1093 |
|
820aede02 kprobes: Use NOKP... |
1094 |
void kretprobe_hash_lock(struct task_struct *tsk, |
ef53d9c5e kprobes: improve ... |
1095 |
struct hlist_head **head, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1096 |
__acquires(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1097 1098 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1099 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1100 1101 1102 |
*head = &kretprobe_inst_table[hash]; hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1103 |
raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1104 |
} |
820aede02 kprobes: Use NOKP... |
1105 |
NOKPROBE_SYMBOL(kretprobe_hash_lock); |
ef53d9c5e kprobes: improve ... |
1106 |
|
820aede02 kprobes: Use NOKP... |
1107 1108 |
static void kretprobe_table_lock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1109 |
__acquires(hlist_lock) |
b94cce926 [PATCH] kprobes: ... |
1110 |
{ |
ec484608c locking, kprobes:... |
1111 1112 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1113 |
} |
820aede02 kprobes: Use NOKP... |
1114 |
NOKPROBE_SYMBOL(kretprobe_table_lock); |
ef53d9c5e kprobes: improve ... |
1115 |
|
820aede02 kprobes: Use NOKP... |
1116 1117 |
void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1118 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1119 1120 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1121 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1122 1123 |
hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1124 |
raw_spin_unlock_irqrestore(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1125 |
} |
820aede02 kprobes: Use NOKP... |
1126 |
NOKPROBE_SYMBOL(kretprobe_hash_unlock); |
ef53d9c5e kprobes: improve ... |
1127 |
|
820aede02 kprobes: Use NOKP... |
1128 1129 |
static void kretprobe_table_unlock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1130 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1131 |
{ |
ec484608c locking, kprobes:... |
1132 1133 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_unlock_irqrestore(hlist_lock, *flags); |
b94cce926 [PATCH] kprobes: ... |
1134 |
} |
820aede02 kprobes: Use NOKP... |
1135 |
NOKPROBE_SYMBOL(kretprobe_table_unlock); |
b94cce926 [PATCH] kprobes: ... |
1136 |
|
b94cce926 [PATCH] kprobes: ... |
1137 |
/* |
c6fd91f0b [PATCH] kretprobe... |
1138 1139 1140 1141 |
* 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: ... |
1142 |
*/ |
820aede02 kprobes: Use NOKP... |
1143 |
void kprobe_flush_task(struct task_struct *tk) |
b94cce926 [PATCH] kprobes: ... |
1144 |
{ |
62c27be0d [PATCH] kprobe wh... |
1145 |
struct kretprobe_instance *ri; |
99219a3fb [PATCH] kretprobe... |
1146 |
struct hlist_head *head, empty_rp; |
b67bfe0d4 hlist: drop the n... |
1147 |
struct hlist_node *tmp; |
ef53d9c5e kprobes: improve ... |
1148 |
unsigned long hash, flags = 0; |
802eae7c8 [PATCH] Return pr... |
1149 |
|
ef53d9c5e kprobes: improve ... |
1150 1151 1152 |
if (unlikely(!kprobes_initialized)) /* Early boot. kretprobe_table_locks not yet initialized. */ return; |
d496aab56 kprobes: initiali... |
1153 |
INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5e kprobes: improve ... |
1154 1155 1156 |
hash = hash_ptr(tk, KPROBE_HASH_BITS); head = &kretprobe_inst_table[hash]; kretprobe_table_lock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1157 |
hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
62c27be0d [PATCH] kprobe wh... |
1158 |
if (ri->task == tk) |
99219a3fb [PATCH] kretprobe... |
1159 |
recycle_rp_inst(ri, &empty_rp); |
62c27be0d [PATCH] kprobe wh... |
1160 |
} |
ef53d9c5e kprobes: improve ... |
1161 |
kretprobe_table_unlock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1162 |
hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3fb [PATCH] kretprobe... |
1163 1164 1165 |
hlist_del(&ri->hlist); kfree(ri); } |
b94cce926 [PATCH] kprobes: ... |
1166 |
} |
820aede02 kprobes: Use NOKP... |
1167 |
NOKPROBE_SYMBOL(kprobe_flush_task); |
b94cce926 [PATCH] kprobes: ... |
1168 |
|
b94cce926 [PATCH] kprobes: ... |
1169 1170 1171 |
static inline void free_rp_inst(struct kretprobe *rp) { struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1172 |
struct hlist_node *next; |
4c4308cb9 kprobes: kretprob... |
1173 |
|
b67bfe0d4 hlist: drop the n... |
1174 |
hlist_for_each_entry_safe(ri, next, &rp->free_instances, hlist) { |
ef53d9c5e kprobes: improve ... |
1175 |
hlist_del(&ri->hlist); |
b94cce926 [PATCH] kprobes: ... |
1176 1177 1178 |
kfree(ri); } } |
820aede02 kprobes: Use NOKP... |
1179 |
static void cleanup_rp_inst(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1180 |
{ |
ef53d9c5e kprobes: improve ... |
1181 |
unsigned long flags, hash; |
4a296e07c kprobes: add (un)... |
1182 |
struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1183 |
struct hlist_node *next; |
ef53d9c5e kprobes: improve ... |
1184 |
struct hlist_head *head; |
4a296e07c kprobes: add (un)... |
1185 |
/* No race here */ |
ef53d9c5e kprobes: improve ... |
1186 1187 1188 |
for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) { kretprobe_table_lock(hash, &flags); head = &kretprobe_inst_table[hash]; |
b67bfe0d4 hlist: drop the n... |
1189 |
hlist_for_each_entry_safe(ri, next, head, hlist) { |
ef53d9c5e kprobes: improve ... |
1190 1191 1192 1193 |
if (ri->rp == rp) ri->rp = NULL; } kretprobe_table_unlock(hash, &flags); |
4a296e07c kprobes: add (un)... |
1194 |
} |
4a296e07c kprobes: add (un)... |
1195 1196 |
free_rp_inst(rp); } |
820aede02 kprobes: Use NOKP... |
1197 |
NOKPROBE_SYMBOL(cleanup_rp_inst); |
4a296e07c kprobes: add (un)... |
1198 |
|
64f562c6d [PATCH] kprobes: ... |
1199 |
/* |
b918e5e60 kprobes: cleanup ... |
1200 |
* Add the new probe to ap->list. Fail if this is the |
8b0914ea7 [PATCH] jprobes: ... |
1201 1202 |
* second jprobe at the address - two jprobes can't coexist */ |
55479f647 kprobes: Allow pr... |
1203 |
static int add_new_kprobe(struct kprobe *ap, struct kprobe *p) |
8b0914ea7 [PATCH] jprobes: ... |
1204 |
{ |
de5bd88d5 kprobes: support ... |
1205 |
BUG_ON(kprobe_gone(ap) || kprobe_gone(p)); |
afd66255b kprobes: Introduc... |
1206 1207 |
if (p->break_handler || p->post_handler) |
6274de498 kprobes: Support ... |
1208 |
unoptimize_kprobe(ap, true); /* Fall back to normal kprobe */ |
afd66255b kprobes: Introduc... |
1209 |
|
8b0914ea7 [PATCH] jprobes: ... |
1210 |
if (p->break_handler) { |
b918e5e60 kprobes: cleanup ... |
1211 |
if (ap->break_handler) |
367216567 [PATCH] Kprobe: m... |
1212 |
return -EEXIST; |
b918e5e60 kprobes: cleanup ... |
1213 1214 |
list_add_tail_rcu(&p->list, &ap->list); ap->break_handler = aggr_break_handler; |
8b0914ea7 [PATCH] jprobes: ... |
1215 |
} else |
b918e5e60 kprobes: cleanup ... |
1216 1217 1218 |
list_add_rcu(&p->list, &ap->list); if (p->post_handler && !ap->post_handler) ap->post_handler = aggr_post_handler; |
de5bd88d5 kprobes: support ... |
1219 |
|
8b0914ea7 [PATCH] jprobes: ... |
1220 1221 1222 1223 |
return 0; } /* |
64f562c6d [PATCH] kprobes: ... |
1224 1225 1226 |
* Fill in the required fields of the "manager kprobe". Replace the * earlier kprobe in the hlist with the manager kprobe */ |
55479f647 kprobes: Allow pr... |
1227 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1228 |
{ |
afd66255b kprobes: Introduc... |
1229 |
/* Copy p's insn slot to ap */ |
8b0914ea7 [PATCH] jprobes: ... |
1230 |
copy_kprobe(p, ap); |
a9ad965ea [PATCH] IA64: kpr... |
1231 |
flush_insn_slot(ap); |
64f562c6d [PATCH] kprobes: ... |
1232 |
ap->addr = p->addr; |
afd66255b kprobes: Introduc... |
1233 |
ap->flags = p->flags & ~KPROBE_FLAG_OPTIMIZED; |
64f562c6d [PATCH] kprobes: ... |
1234 |
ap->pre_handler = aggr_pre_handler; |
64f562c6d [PATCH] kprobes: ... |
1235 |
ap->fault_handler = aggr_fault_handler; |
e8386a0cb kprobes: support ... |
1236 1237 |
/* We don't care the kprobe which has gone. */ if (p->post_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1238 |
ap->post_handler = aggr_post_handler; |
e8386a0cb kprobes: support ... |
1239 |
if (p->break_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1240 |
ap->break_handler = aggr_break_handler; |
64f562c6d [PATCH] kprobes: ... |
1241 1242 |
INIT_LIST_HEAD(&ap->list); |
afd66255b kprobes: Introduc... |
1243 |
INIT_HLIST_NODE(&ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1244 |
|
afd66255b kprobes: Introduc... |
1245 |
list_add_rcu(&p->list, &ap->list); |
adad0f331 [PATCH] kprobes: ... |
1246 |
hlist_replace_rcu(&p->hlist, &ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1247 1248 1249 1250 1251 |
} /* * This is the second or subsequent kprobe at the address - handle * the intricacies |
64f562c6d [PATCH] kprobes: ... |
1252 |
*/ |
55479f647 kprobes: Allow pr... |
1253 |
static int register_aggr_kprobe(struct kprobe *orig_p, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1254 1255 |
{ int ret = 0; |
6d8e40a85 kprobes: Rename o... |
1256 |
struct kprobe *ap = orig_p; |
64f562c6d [PATCH] kprobes: ... |
1257 |
|
2d1e38f56 kprobes: Cure hot... |
1258 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
1259 1260 |
/* For preparing optimization, jump_label_text_reserved() is called */ jump_label_lock(); |
25764288d kprobes: Move loc... |
1261 |
mutex_lock(&text_mutex); |
6d8e40a85 kprobes: Rename o... |
1262 1263 1264 |
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... |
1265 1266 1267 1268 |
if (!ap) { ret = -ENOMEM; goto out; } |
6d8e40a85 kprobes: Rename o... |
1269 |
init_aggr_kprobe(ap, orig_p); |
6274de498 kprobes: Support ... |
1270 |
} else if (kprobe_unused(ap)) |
0490cd1f9 kprobes: Reuse un... |
1271 1272 |
/* This probe is going to die. Rescue it */ reuse_unused_kprobe(ap); |
b918e5e60 kprobes: cleanup ... |
1273 1274 |
if (kprobe_gone(ap)) { |
e8386a0cb kprobes: support ... |
1275 1276 1277 1278 1279 1280 |
/* * 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 ... |
1281 |
ret = arch_prepare_kprobe(ap); |
e8386a0cb kprobes: support ... |
1282 |
if (ret) |
b918e5e60 kprobes: cleanup ... |
1283 1284 1285 1286 1287 |
/* * 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... |
1288 |
goto out; |
de5bd88d5 kprobes: support ... |
1289 |
|
afd66255b kprobes: Introduc... |
1290 1291 |
/* Prepare optimized instructions if possible. */ prepare_optimized_kprobe(ap); |
e8386a0cb kprobes: support ... |
1292 |
/* |
de5bd88d5 kprobes: support ... |
1293 1294 |
* Clear gone flag to prevent allocating new slot again, and * set disabled flag because it is not armed yet. |
e8386a0cb kprobes: support ... |
1295 |
*/ |
de5bd88d5 kprobes: support ... |
1296 1297 |
ap->flags = (ap->flags & ~KPROBE_FLAG_GONE) | KPROBE_FLAG_DISABLED; |
e8386a0cb kprobes: support ... |
1298 |
} |
b918e5e60 kprobes: cleanup ... |
1299 |
|
afd66255b kprobes: Introduc... |
1300 |
/* Copy ap's insn slot to p */ |
b918e5e60 kprobes: cleanup ... |
1301 |
copy_kprobe(ap, p); |
25764288d kprobes: Move loc... |
1302 1303 1304 1305 |
ret = add_new_kprobe(ap, p); out: mutex_unlock(&text_mutex); |
25764288d kprobes: Move loc... |
1306 |
jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
1307 |
cpus_read_unlock(); |
25764288d kprobes: Move loc... |
1308 1309 1310 1311 1312 1313 1314 1315 |
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: ... |
1316 |
} |
be8f27432 kprobes: Prohibit... |
1317 1318 1319 1320 1321 1322 |
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... |
1323 |
bool within_kprobe_blacklist(unsigned long addr) |
d0aaff979 [PATCH] Kprobes: ... |
1324 |
{ |
376e24242 kprobes: Introduc... |
1325 |
struct kprobe_blacklist_entry *ent; |
3d8d996e0 kprobes: prevent ... |
1326 |
|
be8f27432 kprobes: Prohibit... |
1327 |
if (arch_within_kprobe_blacklist(addr)) |
376e24242 kprobes: Introduc... |
1328 |
return true; |
3d8d996e0 kprobes: prevent ... |
1329 1330 1331 1332 |
/* * If there exists a kprobe_blacklist, verify and * fail any probe registration in the prohibited area */ |
376e24242 kprobes: Introduc... |
1333 1334 1335 |
list_for_each_entry(ent, &kprobe_blacklist, list) { if (addr >= ent->start_addr && addr < ent->end_addr) return true; |
3d8d996e0 kprobes: prevent ... |
1336 |
} |
376e24242 kprobes: Introduc... |
1337 1338 |
return false; |
d0aaff979 [PATCH] Kprobes: ... |
1339 |
} |
b2a5cd693 kprobes: fix a nu... |
1340 1341 1342 |
/* * 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 -... |
1343 1344 |
* This returns encoded errors if it fails to look up symbol or invalid * combination of parameters. |
b2a5cd693 kprobes: fix a nu... |
1345 |
*/ |
1d585e709 trace/kprobes: Fi... |
1346 1347 |
static kprobe_opcode_t *_kprobe_addr(kprobe_opcode_t *addr, const char *symbol_name, unsigned int offset) |
b2a5cd693 kprobes: fix a nu... |
1348 |
{ |
1d585e709 trace/kprobes: Fi... |
1349 |
if ((symbol_name && addr) || (!symbol_name && !addr)) |
bc81d48d1 kprobes: Return -... |
1350 |
goto invalid; |
1d585e709 trace/kprobes: Fi... |
1351 |
if (symbol_name) { |
7246f6006 Merge tag 'powerp... |
1352 |
addr = kprobe_lookup_name(symbol_name, offset); |
bc81d48d1 kprobes: Return -... |
1353 1354 |
if (!addr) return ERR_PTR(-ENOENT); |
b2a5cd693 kprobes: fix a nu... |
1355 |
} |
1d585e709 trace/kprobes: Fi... |
1356 |
addr = (kprobe_opcode_t *)(((char *)addr) + offset); |
bc81d48d1 kprobes: Return -... |
1357 1358 1359 1360 1361 |
if (addr) return addr; invalid: return ERR_PTR(-EINVAL); |
b2a5cd693 kprobes: fix a nu... |
1362 |
} |
1d585e709 trace/kprobes: Fi... |
1363 1364 1365 1366 |
static kprobe_opcode_t *kprobe_addr(struct kprobe *p) { return _kprobe_addr(p->addr, p->symbol_name, p->offset); } |
1f0ab4097 kprobes: Prevent ... |
1367 |
/* Check passed kprobe is valid and return kprobe in kprobe_table. */ |
55479f647 kprobes: Allow pr... |
1368 |
static struct kprobe *__get_valid_kprobe(struct kprobe *p) |
1f0ab4097 kprobes: Prevent ... |
1369 |
{ |
6d8e40a85 kprobes: Rename o... |
1370 |
struct kprobe *ap, *list_p; |
1f0ab4097 kprobes: Prevent ... |
1371 |
|
6d8e40a85 kprobes: Rename o... |
1372 1373 |
ap = get_kprobe(p->addr); if (unlikely(!ap)) |
1f0ab4097 kprobes: Prevent ... |
1374 |
return NULL; |
6d8e40a85 kprobes: Rename o... |
1375 1376 |
if (p != ap) { list_for_each_entry_rcu(list_p, &ap->list, list) |
1f0ab4097 kprobes: Prevent ... |
1377 1378 1379 1380 1381 1382 |
if (list_p == p) /* kprobe p is a valid probe */ goto valid; return NULL; } valid: |
6d8e40a85 kprobes: Rename o... |
1383 |
return ap; |
1f0ab4097 kprobes: Prevent ... |
1384 1385 1386 1387 1388 1389 |
} /* Return error if the kprobe is being re-registered */ static inline int check_kprobe_rereg(struct kprobe *p) { int ret = 0; |
1f0ab4097 kprobes: Prevent ... |
1390 1391 |
mutex_lock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1392 |
if (__get_valid_kprobe(p)) |
1f0ab4097 kprobes: Prevent ... |
1393 1394 |
ret = -EINVAL; mutex_unlock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1395 |
|
1f0ab4097 kprobes: Prevent ... |
1396 1397 |
return ret; } |
f7f242ff0 kprobes: introduc... |
1398 |
int __weak arch_check_ftrace_location(struct kprobe *p) |
1da177e4c Linux-2.6.12-rc2 |
1399 |
{ |
ae6aa16fd kprobes: introduc... |
1400 |
unsigned long ftrace_addr; |
ae6aa16fd kprobes: introduc... |
1401 1402 |
ftrace_addr = ftrace_location((unsigned long)p->addr); if (ftrace_addr) { |
e7dbfe349 kprobes/x86: Move... |
1403 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
1404 1405 1406 |
/* Given address is not on the instruction boundary */ if ((unsigned long)p->addr != ftrace_addr) return -EILSEQ; |
ae6aa16fd kprobes: introduc... |
1407 |
p->flags |= KPROBE_FLAG_FTRACE; |
e7dbfe349 kprobes/x86: Move... |
1408 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
1409 1410 1411 |
return -EINVAL; #endif } |
f7f242ff0 kprobes: introduc... |
1412 1413 1414 1415 1416 1417 1418 |
return 0; } static int check_kprobe_address_safe(struct kprobe *p, struct module **probed_mod) { int ret; |
1f0ab4097 kprobes: Prevent ... |
1419 |
|
f7f242ff0 kprobes: introduc... |
1420 1421 1422 |
ret = arch_check_ftrace_location(p); if (ret) return ret; |
91bad2f8d jump label: Fix d... |
1423 |
jump_label_lock(); |
de31c3ca8 jump label: Fix e... |
1424 |
preempt_disable(); |
f7fa6ef0d kprobes: cleanup ... |
1425 1426 |
/* Ensure it is not in reserved area nor out of text */ |
ec30c5f3a kprobes: Use kern... |
1427 |
if (!kernel_text_address((unsigned long) p->addr) || |
376e24242 kprobes: Introduc... |
1428 |
within_kprobe_blacklist((unsigned long) p->addr) || |
f986a499e kprobes: return p... |
1429 1430 |
jump_label_text_reserved(p->addr, p->addr)) { ret = -EINVAL; |
f7fa6ef0d kprobes: cleanup ... |
1431 |
goto out; |
f986a499e kprobes: return p... |
1432 |
} |
b3e55c727 [PATCH] Kprobes: ... |
1433 |
|
f7fa6ef0d kprobes: cleanup ... |
1434 1435 1436 |
/* Check if are we probing a module */ *probed_mod = __module_text_address((unsigned long) p->addr); if (*probed_mod) { |
6f716acd5 kprobes: codingst... |
1437 |
/* |
e8386a0cb kprobes: support ... |
1438 1439 |
* We must hold a refcount of the probed module while updating * its code to prohibit unexpected unloading. |
df019b1d8 [PATCH] kprobes: ... |
1440 |
*/ |
f7fa6ef0d kprobes: cleanup ... |
1441 1442 1443 1444 |
if (unlikely(!try_module_get(*probed_mod))) { ret = -ENOENT; goto out; } |
de31c3ca8 jump label: Fix e... |
1445 |
|
f24659d96 kprobes: support ... |
1446 1447 1448 1449 |
/* * If the module freed .init.text, we couldn't insert * kprobes in there. */ |
f7fa6ef0d kprobes: cleanup ... |
1450 1451 1452 1453 1454 |
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 ... |
1455 |
} |
df019b1d8 [PATCH] kprobes: ... |
1456 |
} |
f7fa6ef0d kprobes: cleanup ... |
1457 |
out: |
a189d0350 kprobes: disable ... |
1458 |
preempt_enable(); |
de31c3ca8 jump label: Fix e... |
1459 |
jump_label_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1460 |
|
f7fa6ef0d kprobes: cleanup ... |
1461 1462 |
return ret; } |
55479f647 kprobes: Allow pr... |
1463 |
int register_kprobe(struct kprobe *p) |
f7fa6ef0d kprobes: cleanup ... |
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 |
{ 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: ... |
1482 |
p->nmissed = 0; |
9861668f7 kprobes: add (un)... |
1483 |
INIT_LIST_HEAD(&p->list); |
afd66255b kprobes: Introduc... |
1484 |
|
f7fa6ef0d kprobes: cleanup ... |
1485 1486 1487 1488 1489 |
ret = check_kprobe_address_safe(p, &probed_mod); if (ret) return ret; mutex_lock(&kprobe_mutex); |
afd66255b kprobes: Introduc... |
1490 |
|
64f562c6d [PATCH] kprobes: ... |
1491 1492 |
old_p = get_kprobe(p->addr); if (old_p) { |
afd66255b kprobes: Introduc... |
1493 |
/* Since this may unoptimize old_p, locking text_mutex. */ |
64f562c6d [PATCH] kprobes: ... |
1494 |
ret = register_aggr_kprobe(old_p, p); |
1da177e4c Linux-2.6.12-rc2 |
1495 1496 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
1497 |
|
2d1e38f56 kprobes: Cure hot... |
1498 1499 1500 |
cpus_read_lock(); /* Prevent text modification */ mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
1501 |
ret = prepare_kprobe(p); |
25764288d kprobes: Move loc... |
1502 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1503 |
cpus_read_unlock(); |
6f716acd5 kprobes: codingst... |
1504 |
if (ret) |
afd66255b kprobes: Introduc... |
1505 |
goto out; |
49a2a1b83 [PATCH] kprobes: ... |
1506 |
|
64f562c6d [PATCH] kprobes: ... |
1507 |
INIT_HLIST_NODE(&p->hlist); |
3516a4604 [PATCH] Kprobes: ... |
1508 |
hlist_add_head_rcu(&p->hlist, |
1da177e4c Linux-2.6.12-rc2 |
1509 |
&kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]); |
de5bd88d5 kprobes: support ... |
1510 |
if (!kprobes_all_disarmed && !kprobe_disabled(p)) |
25764288d kprobes: Move loc... |
1511 |
arm_kprobe(p); |
afd66255b kprobes: Introduc... |
1512 1513 1514 |
/* Try to optimize kprobe */ try_to_optimize_kprobe(p); |
1da177e4c Linux-2.6.12-rc2 |
1515 |
out: |
7a7d1cf95 [PATCH] sem2mutex... |
1516 |
mutex_unlock(&kprobe_mutex); |
49a2a1b83 [PATCH] kprobes: ... |
1517 |
|
e8386a0cb kprobes: support ... |
1518 |
if (probed_mod) |
df019b1d8 [PATCH] kprobes: ... |
1519 |
module_put(probed_mod); |
e8386a0cb kprobes: support ... |
1520 |
|
1da177e4c Linux-2.6.12-rc2 |
1521 1522 |
return ret; } |
99081ab55 kprobes: move EXP... |
1523 |
EXPORT_SYMBOL_GPL(register_kprobe); |
1da177e4c Linux-2.6.12-rc2 |
1524 |
|
6f0f1dd71 kprobes: Cleanup ... |
1525 |
/* Check if all probes on the aggrprobe are disabled */ |
55479f647 kprobes: Allow pr... |
1526 |
static int aggr_kprobe_disabled(struct kprobe *ap) |
6f0f1dd71 kprobes: Cleanup ... |
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 |
{ 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... |
1542 |
static struct kprobe *__disable_kprobe(struct kprobe *p) |
6f0f1dd71 kprobes: Cleanup ... |
1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 |
{ 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... |
1558 1559 1560 1561 1562 1563 1564 |
/* * 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 ... |
1565 1566 1567 1568 1569 1570 |
orig_p->flags |= KPROBE_FLAG_DISABLED; } } return orig_p; } |
de5bd88d5 kprobes: support ... |
1571 1572 1573 |
/* * Unregister a kprobe without a scheduler synchronization. */ |
55479f647 kprobes: Allow pr... |
1574 |
static int __unregister_kprobe_top(struct kprobe *p) |
de5bd88d5 kprobes: support ... |
1575 |
{ |
6d8e40a85 kprobes: Rename o... |
1576 |
struct kprobe *ap, *list_p; |
de5bd88d5 kprobes: support ... |
1577 |
|
6f0f1dd71 kprobes: Cleanup ... |
1578 1579 |
/* Disable kprobe. This will disarm it if needed. */ ap = __disable_kprobe(p); |
6d8e40a85 kprobes: Rename o... |
1580 |
if (ap == NULL) |
de5bd88d5 kprobes: support ... |
1581 |
return -EINVAL; |
6f0f1dd71 kprobes: Cleanup ... |
1582 |
if (ap == p) |
bf8f6e5b3 Kprobes: The ON/O... |
1583 |
/* |
6f0f1dd71 kprobes: Cleanup ... |
1584 1585 |
* This probe is an independent(and non-optimized) kprobe * (not an aggrprobe). Remove from the hash list. |
bf8f6e5b3 Kprobes: The ON/O... |
1586 |
*/ |
6f0f1dd71 kprobes: Cleanup ... |
1587 1588 1589 1590 |
goto disarmed; /* Following process expects this probe is an aggrprobe */ WARN_ON(!kprobe_aggrprobe(ap)); |
6274de498 kprobes: Support ... |
1591 1592 1593 1594 1595 |
if (list_is_singular(&ap->list) && kprobe_disarmed(ap)) /* * !disarmed could be happen if the probe is under delayed * unoptimizing. */ |
6f0f1dd71 kprobes: Cleanup ... |
1596 1597 1598 |
goto disarmed; else { /* If disabling probe has special handlers, update aggrprobe */ |
e8386a0cb kprobes: support ... |
1599 |
if (p->break_handler && !kprobe_gone(p)) |
6d8e40a85 kprobes: Rename o... |
1600 |
ap->break_handler = NULL; |
e8386a0cb kprobes: support ... |
1601 |
if (p->post_handler && !kprobe_gone(p)) { |
6d8e40a85 kprobes: Rename o... |
1602 |
list_for_each_entry_rcu(list_p, &ap->list, list) { |
9861668f7 kprobes: add (un)... |
1603 1604 1605 |
if ((list_p != p) && (list_p->post_handler)) goto noclean; } |
6d8e40a85 kprobes: Rename o... |
1606 |
ap->post_handler = NULL; |
9861668f7 kprobes: add (un)... |
1607 1608 |
} noclean: |
6f0f1dd71 kprobes: Cleanup ... |
1609 1610 1611 1612 |
/* * Remove from the aggrprobe: this path will do nothing in * __unregister_kprobe_bottom(). */ |
49a2a1b83 [PATCH] kprobes: ... |
1613 |
list_del_rcu(&p->list); |
6f0f1dd71 kprobes: Cleanup ... |
1614 1615 1616 1617 1618 1619 |
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: ... |
1620 |
} |
9861668f7 kprobes: add (un)... |
1621 |
return 0; |
6f0f1dd71 kprobes: Cleanup ... |
1622 1623 |
disarmed: |
6274de498 kprobes: Support ... |
1624 |
BUG_ON(!kprobe_disarmed(ap)); |
6f0f1dd71 kprobes: Cleanup ... |
1625 1626 |
hlist_del_rcu(&ap->hlist); return 0; |
9861668f7 kprobes: add (un)... |
1627 |
} |
3516a4604 [PATCH] Kprobes: ... |
1628 |
|
55479f647 kprobes: Allow pr... |
1629 |
static void __unregister_kprobe_bottom(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1630 |
{ |
6d8e40a85 kprobes: Rename o... |
1631 |
struct kprobe *ap; |
b3e55c727 [PATCH] Kprobes: ... |
1632 |
|
e8386a0cb kprobes: support ... |
1633 |
if (list_empty(&p->list)) |
6274de498 kprobes: Support ... |
1634 |
/* This is an independent kprobe */ |
0498b6350 [PATCH] kprobes: ... |
1635 |
arch_remove_kprobe(p); |
e8386a0cb kprobes: support ... |
1636 |
else if (list_is_singular(&p->list)) { |
6274de498 kprobes: Support ... |
1637 |
/* This is the last child of an aggrprobe */ |
6d8e40a85 kprobes: Rename o... |
1638 |
ap = list_entry(p->list.next, struct kprobe, list); |
e8386a0cb kprobes: support ... |
1639 |
list_del(&p->list); |
6d8e40a85 kprobes: Rename o... |
1640 |
free_aggr_kprobe(ap); |
9861668f7 kprobes: add (un)... |
1641 |
} |
6274de498 kprobes: Support ... |
1642 |
/* Otherwise, do nothing. */ |
9861668f7 kprobes: add (un)... |
1643 |
} |
55479f647 kprobes: Allow pr... |
1644 |
int register_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1645 1646 1647 1648 1649 1650 |
{ int i, ret = 0; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1651 |
ret = register_kprobe(kps[i]); |
67dddaad5 kprobes: fix erro... |
1652 1653 1654 |
if (ret < 0) { if (i > 0) unregister_kprobes(kps, i); |
9861668f7 kprobes: add (un)... |
1655 |
break; |
367216567 [PATCH] Kprobe: m... |
1656 |
} |
49a2a1b83 [PATCH] kprobes: ... |
1657 |
} |
9861668f7 kprobes: add (un)... |
1658 1659 |
return ret; } |
99081ab55 kprobes: move EXP... |
1660 |
EXPORT_SYMBOL_GPL(register_kprobes); |
9861668f7 kprobes: add (un)... |
1661 |
|
55479f647 kprobes: Allow pr... |
1662 |
void unregister_kprobe(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1663 1664 1665 |
{ unregister_kprobes(&p, 1); } |
99081ab55 kprobes: move EXP... |
1666 |
EXPORT_SYMBOL_GPL(unregister_kprobe); |
9861668f7 kprobes: add (un)... |
1667 |
|
55479f647 kprobes: Allow pr... |
1668 |
void unregister_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 |
{ 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 |
1684 |
} |
99081ab55 kprobes: move EXP... |
1685 |
EXPORT_SYMBOL_GPL(unregister_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
1686 |
|
5f6bee347 kprobes: Convert ... |
1687 1688 |
int __weak kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data) |
fc62d0207 kprobes: Introduc... |
1689 1690 1691 |
{ return NOTIFY_DONE; } |
5f6bee347 kprobes: Convert ... |
1692 |
NOKPROBE_SYMBOL(kprobe_exceptions_notify); |
fc62d0207 kprobes: Introduc... |
1693 |
|
1da177e4c Linux-2.6.12-rc2 |
1694 1695 |
static struct notifier_block kprobe_exceptions_nb = { .notifier_call = kprobe_exceptions_notify, |
3d5631e06 [PATCH] Kprobes r... |
1696 1697 |
.priority = 0x7fffffff /* we need to be notified first */ }; |
3d7e33825 jprobes: make jpr... |
1698 1699 1700 1701 |
unsigned long __weak arch_deref_entry_point(void *entry) { return (unsigned long)entry; } |
1da177e4c Linux-2.6.12-rc2 |
1702 |
|
55479f647 kprobes: Allow pr... |
1703 |
int register_jprobes(struct jprobe **jps, int num) |
1da177e4c Linux-2.6.12-rc2 |
1704 |
{ |
26b31c190 kprobes: add (un)... |
1705 |
int ret = 0, i; |
3d7e33825 jprobes: make jpr... |
1706 |
|
26b31c190 kprobes: add (un)... |
1707 |
if (num <= 0) |
3d7e33825 jprobes: make jpr... |
1708 |
return -EINVAL; |
0f73ff80b kprobes: Simplify... |
1709 |
|
26b31c190 kprobes: add (un)... |
1710 |
for (i = 0; i < num; i++) { |
0f73ff80b kprobes: Simplify... |
1711 |
ret = register_jprobe(jps[i]); |
edbaadbe4 kprobes: Remove r... |
1712 |
|
67dddaad5 kprobes: fix erro... |
1713 1714 1715 |
if (ret < 0) { if (i > 0) unregister_jprobes(jps, i); |
26b31c190 kprobes: add (un)... |
1716 1717 1718 |
break; } } |
0f73ff80b kprobes: Simplify... |
1719 |
|
26b31c190 kprobes: add (un)... |
1720 1721 |
return ret; } |
99081ab55 kprobes: move EXP... |
1722 |
EXPORT_SYMBOL_GPL(register_jprobes); |
3d7e33825 jprobes: make jpr... |
1723 |
|
55479f647 kprobes: Allow pr... |
1724 |
int register_jprobe(struct jprobe *jp) |
26b31c190 kprobes: add (un)... |
1725 |
{ |
0f73ff80b kprobes: Simplify... |
1726 1727 |
unsigned long addr, offset; struct kprobe *kp = &jp->kp; |
dbf580623 kprobes: Ensure t... |
1728 1729 1730 1731 |
/* * Verify probepoint as well as the jprobe handler are * valid function entry points. */ |
0f73ff80b kprobes: Simplify... |
1732 |
addr = arch_deref_entry_point(jp->entry); |
dbf580623 kprobes: Ensure t... |
1733 1734 |
if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0 && kprobe_on_func_entry(kp->addr, kp->symbol_name, kp->offset)) { |
0f73ff80b kprobes: Simplify... |
1735 1736 1737 1738 1739 1740 |
kp->pre_handler = setjmp_pre_handler; kp->break_handler = longjmp_break_handler; return register_kprobe(kp); } return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1741 |
} |
99081ab55 kprobes: move EXP... |
1742 |
EXPORT_SYMBOL_GPL(register_jprobe); |
1da177e4c Linux-2.6.12-rc2 |
1743 |
|
55479f647 kprobes: Allow pr... |
1744 |
void unregister_jprobe(struct jprobe *jp) |
1da177e4c Linux-2.6.12-rc2 |
1745 |
{ |
26b31c190 kprobes: add (un)... |
1746 1747 |
unregister_jprobes(&jp, 1); } |
99081ab55 kprobes: move EXP... |
1748 |
EXPORT_SYMBOL_GPL(unregister_jprobe); |
26b31c190 kprobes: add (un)... |
1749 |
|
55479f647 kprobes: Allow pr... |
1750 |
void unregister_jprobes(struct jprobe **jps, int num) |
26b31c190 kprobes: add (un)... |
1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 |
{ 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 |
1767 |
} |
99081ab55 kprobes: move EXP... |
1768 |
EXPORT_SYMBOL_GPL(unregister_jprobes); |
1da177e4c Linux-2.6.12-rc2 |
1769 |
|
9edddaa20 Kprobes: indicate... |
1770 |
#ifdef CONFIG_KRETPROBES |
e65cefe87 [PATCH] kernel/kp... |
1771 1772 1773 1774 |
/* * This kprobe pre_handler is registered with every kretprobe. When probe * hits it will set up the return probe. */ |
820aede02 kprobes: Use NOKP... |
1775 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
e65cefe87 [PATCH] kernel/kp... |
1776 1777 |
{ struct kretprobe *rp = container_of(p, struct kretprobe, kp); |
ef53d9c5e kprobes: improve ... |
1778 1779 |
unsigned long hash, flags = 0; struct kretprobe_instance *ri; |
e65cefe87 [PATCH] kernel/kp... |
1780 |
|
f96f56780 kprobes: Skip kre... |
1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 |
/* * 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 ... |
1793 |
hash = hash_ptr(current, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1794 |
raw_spin_lock_irqsave(&rp->lock, flags); |
4c4308cb9 kprobes: kretprob... |
1795 |
if (!hlist_empty(&rp->free_instances)) { |
4c4308cb9 kprobes: kretprob... |
1796 |
ri = hlist_entry(rp->free_instances.first, |
ef53d9c5e kprobes: improve ... |
1797 1798 |
struct kretprobe_instance, hlist); hlist_del(&ri->hlist); |
ec484608c locking, kprobes:... |
1799 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1800 |
|
4c4308cb9 kprobes: kretprob... |
1801 1802 |
ri->rp = rp; ri->task = current; |
f47cd9b55 kprobes: kretprob... |
1803 |
|
55ca6140e kprobes: fix a me... |
1804 1805 1806 1807 |
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... |
1808 |
return 0; |
55ca6140e kprobes: fix a me... |
1809 |
} |
f47cd9b55 kprobes: kretprob... |
1810 |
|
4c4308cb9 kprobes: kretprob... |
1811 1812 1813 |
arch_prepare_kretprobe(ri, regs); /* XXX(hch): why is there no hlist_move_head? */ |
ef53d9c5e kprobes: improve ... |
1814 1815 1816 1817 1818 |
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... |
1819 |
rp->nmissed++; |
ec484608c locking, kprobes:... |
1820 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1821 |
} |
e65cefe87 [PATCH] kernel/kp... |
1822 1823 |
return 0; } |
820aede02 kprobes: Use NOKP... |
1824 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
e65cefe87 [PATCH] kernel/kp... |
1825 |
|
659b957f2 kprobes: Rename [... |
1826 |
bool __weak arch_kprobe_on_func_entry(unsigned long offset) |
90ec5e89e kretprobes: Ensur... |
1827 1828 1829 |
{ return !offset; } |
659b957f2 kprobes: Rename [... |
1830 |
bool kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset) |
1d585e709 trace/kprobes: Fi... |
1831 1832 1833 1834 1835 1836 1837 |
{ 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 [... |
1838 |
!arch_kprobe_on_func_entry(offset)) |
1d585e709 trace/kprobes: Fi... |
1839 1840 1841 1842 |
return false; return true; } |
55479f647 kprobes: Allow pr... |
1843 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1844 1845 1846 1847 |
{ int ret = 0; struct kretprobe_instance *inst; int i; |
b2a5cd693 kprobes: fix a nu... |
1848 |
void *addr; |
90ec5e89e kretprobes: Ensur... |
1849 |
|
659b957f2 kprobes: Rename [... |
1850 |
if (!kprobe_on_func_entry(rp->kp.addr, rp->kp.symbol_name, rp->kp.offset)) |
90ec5e89e kretprobes: Ensur... |
1851 |
return -EINVAL; |
f438d914b kprobes: support ... |
1852 1853 |
if (kretprobe_blacklist_size) { |
b2a5cd693 kprobes: fix a nu... |
1854 |
addr = kprobe_addr(&rp->kp); |
bc81d48d1 kprobes: Return -... |
1855 1856 |
if (IS_ERR(addr)) return PTR_ERR(addr); |
f438d914b kprobes: support ... |
1857 1858 1859 1860 1861 1862 |
for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { if (kretprobe_blacklist[i].addr == addr) return -EINVAL; } } |
b94cce926 [PATCH] kprobes: ... |
1863 1864 |
rp->kp.pre_handler = pre_handler_kretprobe; |
7522a8423 [PATCH] kprobes: ... |
1865 1866 1867 |
rp->kp.post_handler = NULL; rp->kp.fault_handler = NULL; rp->kp.break_handler = NULL; |
b94cce926 [PATCH] kprobes: ... |
1868 1869 1870 1871 |
/* Pre-allocate memory for max kretprobe instances */ if (rp->maxactive <= 0) { #ifdef CONFIG_PREEMPT |
c2ef6661c kprobes: Fix dist... |
1872 |
rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus()); |
b94cce926 [PATCH] kprobes: ... |
1873 |
#else |
4dae560f9 kprobes: Sanitize... |
1874 |
rp->maxactive = num_possible_cpus(); |
b94cce926 [PATCH] kprobes: ... |
1875 1876 |
#endif } |
ec484608c locking, kprobes:... |
1877 |
raw_spin_lock_init(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1878 1879 |
INIT_HLIST_HEAD(&rp->free_instances); for (i = 0; i < rp->maxactive; i++) { |
f47cd9b55 kprobes: kretprob... |
1880 1881 |
inst = kmalloc(sizeof(struct kretprobe_instance) + rp->data_size, GFP_KERNEL); |
b94cce926 [PATCH] kprobes: ... |
1882 1883 1884 1885 |
if (inst == NULL) { free_rp_inst(rp); return -ENOMEM; } |
ef53d9c5e kprobes: improve ... |
1886 1887 |
INIT_HLIST_NODE(&inst->hlist); hlist_add_head(&inst->hlist, &rp->free_instances); |
b94cce926 [PATCH] kprobes: ... |
1888 1889 1890 1891 |
} rp->nmissed = 0; /* Establish function entry probe point */ |
49ad2fd76 kprobes: remove c... |
1892 |
ret = register_kprobe(&rp->kp); |
4a296e07c kprobes: add (un)... |
1893 |
if (ret != 0) |
b94cce926 [PATCH] kprobes: ... |
1894 1895 1896 |
free_rp_inst(rp); return ret; } |
99081ab55 kprobes: move EXP... |
1897 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1898 |
|
55479f647 kprobes: Allow pr... |
1899 |
int register_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1900 1901 1902 1903 1904 1905 |
{ int ret = 0, i; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1906 |
ret = register_kretprobe(rps[i]); |
67dddaad5 kprobes: fix erro... |
1907 1908 1909 |
if (ret < 0) { if (i > 0) unregister_kretprobes(rps, i); |
4a296e07c kprobes: add (un)... |
1910 1911 1912 1913 1914 |
break; } } return ret; } |
99081ab55 kprobes: move EXP... |
1915 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
4a296e07c kprobes: add (un)... |
1916 |
|
55479f647 kprobes: Allow pr... |
1917 |
void unregister_kretprobe(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1918 1919 1920 |
{ unregister_kretprobes(&rp, 1); } |
99081ab55 kprobes: move EXP... |
1921 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
4a296e07c kprobes: add (un)... |
1922 |
|
55479f647 kprobes: Allow pr... |
1923 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 |
{ 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... |
1943 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4a296e07c kprobes: add (un)... |
1944 |
|
9edddaa20 Kprobes: indicate... |
1945 |
#else /* CONFIG_KRETPROBES */ |
55479f647 kprobes: Allow pr... |
1946 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1947 1948 1949 |
{ return -ENOSYS; } |
99081ab55 kprobes: move EXP... |
1950 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1951 |
|
55479f647 kprobes: Allow pr... |
1952 |
int register_kretprobes(struct kretprobe **rps, int num) |
346fd59ba [PATCH] kprobes: ... |
1953 |
{ |
4a296e07c kprobes: add (un)... |
1954 |
return -ENOSYS; |
346fd59ba [PATCH] kprobes: ... |
1955 |
} |
99081ab55 kprobes: move EXP... |
1956 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
55479f647 kprobes: Allow pr... |
1957 |
void unregister_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1958 |
{ |
4a296e07c kprobes: add (un)... |
1959 |
} |
99081ab55 kprobes: move EXP... |
1960 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1961 |
|
55479f647 kprobes: Allow pr... |
1962 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1963 1964 |
{ } |
99081ab55 kprobes: move EXP... |
1965 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4c4308cb9 kprobes: kretprob... |
1966 |
|
820aede02 kprobes: Use NOKP... |
1967 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
4a296e07c kprobes: add (un)... |
1968 1969 |
{ return 0; |
b94cce926 [PATCH] kprobes: ... |
1970 |
} |
820aede02 kprobes: Use NOKP... |
1971 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1972 |
|
4a296e07c kprobes: add (un)... |
1973 |
#endif /* CONFIG_KRETPROBES */ |
e8386a0cb kprobes: support ... |
1974 |
/* Set the kprobe gone and remove its instruction buffer. */ |
55479f647 kprobes: Allow pr... |
1975 |
static void kill_kprobe(struct kprobe *p) |
e8386a0cb kprobes: support ... |
1976 1977 |
{ struct kprobe *kp; |
de5bd88d5 kprobes: support ... |
1978 |
|
e8386a0cb kprobes: support ... |
1979 |
p->flags |= KPROBE_FLAG_GONE; |
afd66255b kprobes: Introduc... |
1980 |
if (kprobe_aggrprobe(p)) { |
e8386a0cb kprobes: support ... |
1981 1982 1983 1984 1985 1986 1987 1988 |
/* * 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... |
1989 |
kill_optimized_kprobe(p); |
e8386a0cb kprobes: support ... |
1990 1991 1992 1993 1994 1995 1996 |
} /* * 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... |
1997 |
/* Disable one kprobe */ |
55479f647 kprobes: Allow pr... |
1998 |
int disable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
1999 2000 |
{ int ret = 0; |
c0614829c kprobes: Move ena... |
2001 2002 |
mutex_lock(&kprobe_mutex); |
6f0f1dd71 kprobes: Cleanup ... |
2003 2004 |
/* Disable this kprobe */ if (__disable_kprobe(kp) == NULL) |
c0614829c kprobes: Move ena... |
2005 |
ret = -EINVAL; |
c0614829c kprobes: Move ena... |
2006 |
|
c0614829c kprobes: Move ena... |
2007 2008 2009 2010 2011 2012 |
mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(disable_kprobe); /* Enable one kprobe */ |
55479f647 kprobes: Allow pr... |
2013 |
int enable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 |
{ 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... |
2045 |
void dump_kprobe(struct kprobe *kp) |
24851d244 tracing/kprobes: ... |
2046 2047 2048 2049 2050 2051 2052 2053 2054 |
{ 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... |
2055 |
NOKPROBE_SYMBOL(dump_kprobe); |
24851d244 tracing/kprobes: ... |
2056 |
|
376e24242 kprobes: Introduc... |
2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 |
/* * 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... |
2070 |
unsigned long entry, offset = 0, size = 0; |
376e24242 kprobes: Introduc... |
2071 2072 |
for (iter = start; iter < end; iter++) { |
d81b4253b kprobes: Fix "Fai... |
2073 2074 2075 2076 2077 2078 2079 |
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... |
2080 2081 2082 2083 2084 2085 |
continue; } ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; |
d81b4253b kprobes: Fix "Fai... |
2086 2087 |
ent->start_addr = entry; ent->end_addr = entry + size; |
376e24242 kprobes: Introduc... |
2088 2089 2090 2091 2092 |
INIT_LIST_HEAD(&ent->list); list_add_tail(&ent->list, &kprobe_blacklist); } return 0; } |
e8386a0cb kprobes: support ... |
2093 |
/* Module notifier call back, checking kprobes on the module */ |
55479f647 kprobes: Allow pr... |
2094 2095 |
static int kprobes_module_callback(struct notifier_block *nb, unsigned long val, void *data) |
e8386a0cb kprobes: support ... |
2096 2097 2098 |
{ struct module *mod = data; struct hlist_head *head; |
e8386a0cb kprobes: support ... |
2099 2100 |
struct kprobe *p; unsigned int i; |
f24659d96 kprobes: support ... |
2101 |
int checkcore = (val == MODULE_STATE_GOING); |
e8386a0cb kprobes: support ... |
2102 |
|
f24659d96 kprobes: support ... |
2103 |
if (val != MODULE_STATE_GOING && val != MODULE_STATE_LIVE) |
e8386a0cb kprobes: support ... |
2104 2105 2106 |
return NOTIFY_DONE; /* |
f24659d96 kprobes: support ... |
2107 2108 2109 2110 |
* 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 ... |
2111 2112 2113 2114 |
*/ mutex_lock(&kprobe_mutex); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2115 |
hlist_for_each_entry_rcu(p, head, hlist) |
f24659d96 kprobes: support ... |
2116 2117 2118 |
if (within_module_init((unsigned long)p->addr, mod) || (checkcore && within_module_core((unsigned long)p->addr, mod))) { |
e8386a0cb kprobes: support ... |
2119 2120 2121 2122 |
/* * 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... |
2123 2124 2125 2126 2127 2128 |
* * 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 ... |
2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 |
*/ 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... |
2141 2142 2143 |
/* Markers of _kprobe_blacklist section */ extern unsigned long __start_kprobe_blacklist[]; extern unsigned long __stop_kprobe_blacklist[]; |
1da177e4c Linux-2.6.12-rc2 |
2144 2145 2146 2147 2148 2149 |
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: ... |
2150 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { |
1da177e4c Linux-2.6.12-rc2 |
2151 |
INIT_HLIST_HEAD(&kprobe_table[i]); |
b94cce926 [PATCH] kprobes: ... |
2152 |
INIT_HLIST_HEAD(&kretprobe_inst_table[i]); |
ec484608c locking, kprobes:... |
2153 |
raw_spin_lock_init(&(kretprobe_table_locks[i].lock)); |
b94cce926 [PATCH] kprobes: ... |
2154 |
} |
1da177e4c Linux-2.6.12-rc2 |
2155 |
|
376e24242 kprobes: Introduc... |
2156 2157 2158 2159 2160 2161 2162 |
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 ... |
2163 |
} |
f438d914b kprobes: support ... |
2164 2165 2166 |
if (kretprobe_blacklist_size) { /* lookup the function address from its name */ for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { |
49e0b4658 kprobes: Convert ... |
2167 |
kretprobe_blacklist[i].addr = |
290e30707 powerpc/kprobes: ... |
2168 |
kprobe_lookup_name(kretprobe_blacklist[i].name, 0); |
f438d914b kprobes: support ... |
2169 2170 2171 2172 2173 2174 |
if (!kretprobe_blacklist[i].addr) printk("kretprobe: lookup failed: %s ", kretprobe_blacklist[i].name); } } |
b2be84df9 kprobes: Jump opt... |
2175 2176 |
#if defined(CONFIG_OPTPROBES) #if defined(__ARCH_WANT_KPROBES_INSN_SLOT) |
afd66255b kprobes: Introduc... |
2177 2178 2179 |
/* Init kprobe_optinsn_slots */ kprobe_optinsn_slots.insn_size = MAX_OPTINSN_SIZE; #endif |
b2be84df9 kprobes: Jump opt... |
2180 2181 2182 |
/* By default, kprobes can be optimized */ kprobes_allow_optimization = true; #endif |
afd66255b kprobes: Introduc... |
2183 |
|
e579abeb5 kprobes: rename k... |
2184 2185 |
/* By default, kprobes are armed */ kprobes_all_disarmed = false; |
bf8f6e5b3 Kprobes: The ON/O... |
2186 |
|
6772926be [PATCH] kprobes: ... |
2187 |
err = arch_init_kprobes(); |
802eae7c8 [PATCH] Return pr... |
2188 2189 |
if (!err) err = register_die_notifier(&kprobe_exceptions_nb); |
e8386a0cb kprobes: support ... |
2190 2191 |
if (!err) err = register_module_notifier(&kprobe_module_nb); |
ef53d9c5e kprobes: improve ... |
2192 |
kprobes_initialized = (err == 0); |
802eae7c8 [PATCH] Return pr... |
2193 |
|
8c1c93564 x86: kprobes: add... |
2194 2195 |
if (!err) init_test_probes(); |
1da177e4c Linux-2.6.12-rc2 |
2196 2197 |
return err; } |
346fd59ba [PATCH] kprobes: ... |
2198 |
#ifdef CONFIG_DEBUG_FS |
55479f647 kprobes: Allow pr... |
2199 |
static void report_probe(struct seq_file *pi, struct kprobe *p, |
afd66255b kprobes: Introduc... |
2200 |
const char *sym, int offset, char *modname, struct kprobe *pp) |
346fd59ba [PATCH] kprobes: ... |
2201 2202 2203 2204 2205 2206 2207 2208 2209 |
{ 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... |
2210 |
|
346fd59ba [PATCH] kprobes: ... |
2211 |
if (sym) |
afd66255b kprobes: Introduc... |
2212 |
seq_printf(pi, "%p %s %s+0x%x %s ", |
de5bd88d5 kprobes: support ... |
2213 |
p->addr, kprobe_type, sym, offset, |
afd66255b kprobes: Introduc... |
2214 |
(modname ? modname : " ")); |
346fd59ba [PATCH] kprobes: ... |
2215 |
else |
afd66255b kprobes: Introduc... |
2216 2217 2218 2219 2220 |
seq_printf(pi, "%p %s %p ", p->addr, kprobe_type, p->addr); if (!pp) pp = p; |
ae6aa16fd kprobes: introduc... |
2221 2222 |
seq_printf(pi, "%s%s%s%s ", |
afd66255b kprobes: Introduc... |
2223 2224 |
(kprobe_gone(p) ? "[GONE]" : ""), ((kprobe_disabled(p) && !kprobe_gone(p)) ? "[DISABLED]" : ""), |
ae6aa16fd kprobes: introduc... |
2225 2226 |
(kprobe_optimized(pp) ? "[OPTIMIZED]" : ""), (kprobe_ftrace(pp) ? "[FTRACE]" : "")); |
346fd59ba [PATCH] kprobes: ... |
2227 |
} |
55479f647 kprobes: Allow pr... |
2228 |
static void *kprobe_seq_start(struct seq_file *f, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2229 2230 2231 |
{ return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL; } |
55479f647 kprobes: Allow pr... |
2232 |
static void *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2233 2234 2235 2236 2237 2238 |
{ (*pos)++; if (*pos >= KPROBE_TABLE_SIZE) return NULL; return pos; } |
55479f647 kprobes: Allow pr... |
2239 |
static void kprobe_seq_stop(struct seq_file *f, void *v) |
346fd59ba [PATCH] kprobes: ... |
2240 2241 2242 |
{ /* Nothing to do */ } |
55479f647 kprobes: Allow pr... |
2243 |
static int show_kprobe_addr(struct seq_file *pi, void *v) |
346fd59ba [PATCH] kprobes: ... |
2244 2245 |
{ struct hlist_head *head; |
346fd59ba [PATCH] kprobes: ... |
2246 2247 2248 |
struct kprobe *p, *kp; const char *sym = NULL; unsigned int i = *(loff_t *) v; |
ffb451227 Simplify kallsyms... |
2249 |
unsigned long offset = 0; |
ab7678656 kprobes: use KSYM... |
2250 |
char *modname, namebuf[KSYM_NAME_LEN]; |
346fd59ba [PATCH] kprobes: ... |
2251 2252 2253 |
head = &kprobe_table[i]; preempt_disable(); |
b67bfe0d4 hlist: drop the n... |
2254 |
hlist_for_each_entry_rcu(p, head, hlist) { |
ffb451227 Simplify kallsyms... |
2255 |
sym = kallsyms_lookup((unsigned long)p->addr, NULL, |
346fd59ba [PATCH] kprobes: ... |
2256 |
&offset, &modname, namebuf); |
afd66255b kprobes: Introduc... |
2257 |
if (kprobe_aggrprobe(p)) { |
346fd59ba [PATCH] kprobes: ... |
2258 |
list_for_each_entry_rcu(kp, &p->list, list) |
afd66255b kprobes: Introduc... |
2259 |
report_probe(pi, kp, sym, offset, modname, p); |
346fd59ba [PATCH] kprobes: ... |
2260 |
} else |
afd66255b kprobes: Introduc... |
2261 |
report_probe(pi, p, sym, offset, modname, NULL); |
346fd59ba [PATCH] kprobes: ... |
2262 2263 2264 2265 |
} preempt_enable(); return 0; } |
88e9d34c7 seq_file: constif... |
2266 |
static const struct seq_operations kprobes_seq_ops = { |
346fd59ba [PATCH] kprobes: ... |
2267 2268 2269 2270 2271 |
.start = kprobe_seq_start, .next = kprobe_seq_next, .stop = kprobe_seq_stop, .show = show_kprobe_addr }; |
55479f647 kprobes: Allow pr... |
2272 |
static int kprobes_open(struct inode *inode, struct file *filp) |
346fd59ba [PATCH] kprobes: ... |
2273 2274 2275 |
{ return seq_open(filp, &kprobes_seq_ops); } |
828c09509 const: constify r... |
2276 |
static const struct file_operations debugfs_kprobes_operations = { |
346fd59ba [PATCH] kprobes: ... |
2277 2278 2279 2280 2281 |
.open = kprobes_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
637247403 kprobes: Show bla... |
2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 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 |
/* 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... |
2322 |
static void arm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2323 2324 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2325 2326 2327 2328 |
struct kprobe *p; unsigned int i; mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2329 2330 |
/* If kprobes are armed, just return */ if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2331 |
goto already_enabled; |
977ad481b kprobes: set kpro... |
2332 2333 2334 2335 2336 2337 |
/* * 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... |
2338 |
/* Arming kprobes doesn't optimize kprobe itself */ |
bf8f6e5b3 Kprobes: The ON/O... |
2339 2340 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2341 |
hlist_for_each_entry_rcu(p, head, hlist) |
de5bd88d5 kprobes: support ... |
2342 |
if (!kprobe_disabled(p)) |
ae6aa16fd kprobes: introduc... |
2343 |
arm_kprobe(p); |
bf8f6e5b3 Kprobes: The ON/O... |
2344 |
} |
bf8f6e5b3 Kprobes: The ON/O... |
2345 2346 2347 2348 2349 2350 2351 |
printk(KERN_INFO "Kprobes globally enabled "); already_enabled: mutex_unlock(&kprobe_mutex); return; } |
55479f647 kprobes: Allow pr... |
2352 |
static void disarm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2353 2354 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2355 2356 2357 2358 |
struct kprobe *p; unsigned int i; mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2359 |
/* If kprobes are already disarmed, just return */ |
6274de498 kprobes: Support ... |
2360 2361 2362 2363 |
if (kprobes_all_disarmed) { mutex_unlock(&kprobe_mutex); return; } |
bf8f6e5b3 Kprobes: The ON/O... |
2364 |
|
e579abeb5 kprobes: rename k... |
2365 |
kprobes_all_disarmed = true; |
bf8f6e5b3 Kprobes: The ON/O... |
2366 2367 |
printk(KERN_INFO "Kprobes globally disabled "); |
afd66255b kprobes: Introduc... |
2368 |
|
bf8f6e5b3 Kprobes: The ON/O... |
2369 2370 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2371 |
hlist_for_each_entry_rcu(p, head, hlist) { |
de5bd88d5 kprobes: support ... |
2372 |
if (!arch_trampoline_kprobe(p) && !kprobe_disabled(p)) |
ae6aa16fd kprobes: introduc... |
2373 |
disarm_kprobe(p, false); |
bf8f6e5b3 Kprobes: The ON/O... |
2374 2375 |
} } |
bf8f6e5b3 Kprobes: The ON/O... |
2376 |
mutex_unlock(&kprobe_mutex); |
bf8f6e5b3 Kprobes: The ON/O... |
2377 |
|
6274de498 kprobes: Support ... |
2378 2379 |
/* Wait for disarming all kprobes by optimizer */ wait_for_kprobe_optimizer(); |
bf8f6e5b3 Kprobes: The ON/O... |
2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 |
} /* * 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... |
2391 |
if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 |
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 ... |
2405 |
size_t buf_size; |
bf8f6e5b3 Kprobes: The ON/O... |
2406 2407 2408 2409 |
buf_size = min(count, (sizeof(buf)-1)); if (copy_from_user(buf, user_buf, buf_size)) return -EFAULT; |
10fb46d5f kprobes: handle e... |
2410 |
buf[buf_size] = '\0'; |
bf8f6e5b3 Kprobes: The ON/O... |
2411 2412 2413 2414 |
switch (buf[0]) { case 'y': case 'Y': case '1': |
e579abeb5 kprobes: rename k... |
2415 |
arm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2416 2417 2418 2419 |
break; case 'n': case 'N': case '0': |
e579abeb5 kprobes: rename k... |
2420 |
disarm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2421 |
break; |
10fb46d5f kprobes: handle e... |
2422 2423 |
default: return -EINVAL; |
bf8f6e5b3 Kprobes: The ON/O... |
2424 2425 2426 2427 |
} return count; } |
828c09509 const: constify r... |
2428 |
static const struct file_operations fops_kp = { |
bf8f6e5b3 Kprobes: The ON/O... |
2429 2430 |
.read = read_enabled_file_bool, .write = write_enabled_file_bool, |
6038f373a llseek: automatic... |
2431 |
.llseek = default_llseek, |
bf8f6e5b3 Kprobes: The ON/O... |
2432 |
}; |
55479f647 kprobes: Allow pr... |
2433 |
static int __init debugfs_kprobe_init(void) |
346fd59ba [PATCH] kprobes: ... |
2434 2435 |
{ struct dentry *dir, *file; |
bf8f6e5b3 Kprobes: The ON/O... |
2436 |
unsigned int value = 1; |
346fd59ba [PATCH] kprobes: ... |
2437 2438 2439 2440 |
dir = debugfs_create_dir("kprobes", NULL); if (!dir) return -ENOMEM; |
4bdf9c175 kprobes: Make lis... |
2441 |
file = debugfs_create_file("list", 0400, dir, NULL, |
346fd59ba [PATCH] kprobes: ... |
2442 |
&debugfs_kprobes_operations); |
637247403 kprobes: Show bla... |
2443 2444 |
if (!file) goto error; |
346fd59ba [PATCH] kprobes: ... |
2445 |
|
bf8f6e5b3 Kprobes: The ON/O... |
2446 2447 |
file = debugfs_create_file("enabled", 0600, dir, &value, &fops_kp); |
637247403 kprobes: Show bla... |
2448 2449 |
if (!file) goto error; |
4bdf9c175 kprobes: Make lis... |
2450 |
file = debugfs_create_file("blacklist", 0400, dir, NULL, |
637247403 kprobes: Show bla... |
2451 2452 2453 |
&debugfs_kprobe_blacklist_ops); if (!file) goto error; |
bf8f6e5b3 Kprobes: The ON/O... |
2454 |
|
346fd59ba [PATCH] kprobes: ... |
2455 |
return 0; |
637247403 kprobes: Show bla... |
2456 2457 2458 2459 |
error: debugfs_remove(dir); return -ENOMEM; |
346fd59ba [PATCH] kprobes: ... |
2460 2461 2462 2463 2464 2465 |
} late_initcall(debugfs_kprobe_init); #endif /* CONFIG_DEBUG_FS */ module_init(init_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
2466 |
|
99081ab55 kprobes: move EXP... |
2467 |
/* defined in arch/.../kernel/kprobes.c */ |
1da177e4c Linux-2.6.12-rc2 |
2468 |
EXPORT_SYMBOL_GPL(jprobe_return); |