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kernel/kprobes.c
58.8 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-generic/sections.h> |
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#include <asm/cacheflush.h> #include <asm/errno.h> |
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#include <asm/uaccess.h> |
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#define KPROBE_HASH_BITS 6 #define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS) |
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/* * Some oddball architectures like 64bit powerpc have function descriptors * so this must be overridable. */ #ifndef kprobe_lookup_name #define kprobe_lookup_name(name, addr) \ addr = ((kprobe_opcode_t *)(kallsyms_lookup_name(name))) #endif |
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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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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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/* * Normally, functions that we'd want to prohibit kprobes in, are marked * __kprobes. But, there are cases where such functions already belong to * a different section (__sched for preempt_schedule) * * For such cases, we now have a blacklist */ |
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static struct kprobe_blackpoint kprobe_blacklist[] = { |
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{"preempt_schedule",}, |
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{"native_get_debugreg",}, |
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{"irq_entries_start",}, {"common_interrupt",}, |
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{"mcount",}, /* mcount can be called from everywhere */ |
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{NULL} /* Terminator */ }; |
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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); } static void free_insn_page(void *page) { module_free(NULL, page); } |
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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, }; static int __kprobes 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 __kprobes *__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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mutex_lock(&c->mutex); |
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retry: |
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list_for_each_entry(kip, &c->pages, list) { 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); 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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/* 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(&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. */ static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx) { |
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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(&kip->list); |
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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 __kprobes 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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|
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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 && |
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collect_one_slot(kip, i)) break; } } |
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c->nr_garbage = 0; |
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return 0; } |
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void __kprobes __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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|
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mutex_lock(&c->mutex); |
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list_for_each_entry(kip, &c->pages, list) { |
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long idx = ((long)slot - (long)kip->insns) / (c->insn_size * sizeof(kprobe_opcode_t)); |
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if (idx >= 0 && idx < slots_per_page(c)) { WARN_ON(kip->slot_used[idx] != SLOT_USED); |
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if (dirty) { |
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kip->slot_used[idx] = SLOT_DIRTY; |
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kip->ngarbage++; |
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if (++c->nr_garbage > slots_per_page(c)) collect_garbage_slots(c); |
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} else |
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collect_one_slot(kip, idx); |
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goto out; |
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} } |
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/* Could not free this slot. */ WARN_ON(1); |
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out: mutex_unlock(&c->mutex); |
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} |
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|
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#ifdef CONFIG_OPTPROBES /* For optimized_kprobe buffer */ |
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struct kprobe_insn_cache kprobe_optinsn_slots = { .mutex = __MUTEX_INITIALIZER(kprobe_optinsn_slots.mutex), |
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.alloc = alloc_insn_page, .free = free_insn_page, |
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.pages = LIST_HEAD_INIT(kprobe_optinsn_slots.pages), /* .insn_size is initialized later */ .nr_garbage = 0, }; |
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#endif |
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#endif |
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|
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/* We have preemption disabled.. so it is safe to use __ versions */ static inline void set_kprobe_instance(struct kprobe *kp) { |
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__this_cpu_write(kprobe_instance, kp); |
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} static inline void reset_kprobe_instance(void) { |
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__this_cpu_write(kprobe_instance, NULL); |
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} |
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/* * This routine is called either: |
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* - under the kprobe_mutex - during kprobe_[un]register() |
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* OR |
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* - with preemption disabled - from arch/xxx/kernel/kprobes.c |
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*/ |
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struct kprobe __kprobes *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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static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs); /* 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. */ void __kprobes opt_pre_handler(struct kprobe *p, struct pt_regs *regs) { 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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/* Free optimized instructions and optimized_kprobe */ static __kprobes void free_aggr_kprobe(struct kprobe *p) { struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); arch_remove_optimized_kprobe(op); arch_remove_kprobe(p); kfree(op); } |
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/* 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 ... |
379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 |
/* Return true(!0) if the kprobe is disarmed. Note: p must be on hash list */ static inline int kprobe_disarmed(struct kprobe *p) { struct optimized_kprobe *op; /* If kprobe is not aggr/opt probe, just return kprobe is disabled */ if (!kprobe_aggrprobe(p)) return kprobe_disabled(p); op = container_of(p, struct optimized_kprobe, kp); return kprobe_disabled(p) && list_empty(&op->list); } /* Return true(!0) if the probe is queued on (un)optimizing lists */ static int __kprobes kprobe_queued(struct kprobe *p) { 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... |
405 406 407 408 |
/* * Return an optimized kprobe whose optimizing code replaces * instructions including addr (exclude breakpoint). */ |
6376b2297 kprobes: Make fun... |
409 |
static struct kprobe *__kprobes get_optimized_kprobe(unsigned long addr) |
afd66255b kprobes: Introduc... |
410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 |
{ 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 ... |
430 |
static LIST_HEAD(unoptimizing_list); |
7b959fc58 kprobes: Fix to f... |
431 |
static LIST_HEAD(freeing_list); |
afd66255b kprobes: Introduc... |
432 433 434 435 |
static void kprobe_optimizer(struct work_struct *work); static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer); #define OPTIMIZE_DELAY 5 |
61f4e13ff kprobes: Separate... |
436 437 438 439 440 |
/* * Optimize (replace a breakpoint with a jump) kprobes listed on * optimizing_list. */ static __kprobes void do_optimize_kprobes(void) |
afd66255b kprobes: Introduc... |
441 |
{ |
6274de498 kprobes: Support ... |
442 443 444 445 |
/* Optimization never be done when disarmed */ if (kprobes_all_disarmed || !kprobes_allow_optimization || list_empty(&optimizing_list)) return; |
afd66255b kprobes: Introduc... |
446 447 448 449 450 451 452 453 454 455 456 457 |
/* * 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) * To avoid this deadlock, we need to call get_online_cpus() * for preventing cpu-hotplug outside of text_mutex locking. */ get_online_cpus(); mutex_lock(&text_mutex); |
cd7ebe229 kprobes: Use text... |
458 |
arch_optimize_kprobes(&optimizing_list); |
afd66255b kprobes: Introduc... |
459 460 |
mutex_unlock(&text_mutex); put_online_cpus(); |
61f4e13ff kprobes: Separate... |
461 |
} |
6274de498 kprobes: Support ... |
462 463 464 465 |
/* * Unoptimize (replace a jump with a breakpoint and remove the breakpoint * if need) kprobes listed on unoptimizing_list. */ |
7b959fc58 kprobes: Fix to f... |
466 |
static __kprobes void do_unoptimize_kprobes(void) |
6274de498 kprobes: Support ... |
467 468 469 470 471 472 473 474 475 476 |
{ struct optimized_kprobe *op, *tmp; /* Unoptimization must be done anytime */ if (list_empty(&unoptimizing_list)) return; /* Ditto to do_optimize_kprobes */ get_online_cpus(); mutex_lock(&text_mutex); |
7b959fc58 kprobes: Fix to f... |
477 |
arch_unoptimize_kprobes(&unoptimizing_list, &freeing_list); |
f984ba4eb kprobes: Use text... |
478 |
/* Loop free_list for disarming */ |
7b959fc58 kprobes: Fix to f... |
479 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
6274de498 kprobes: Support ... |
480 481 482 483 484 485 486 487 488 489 |
/* 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 ... |
490 491 492 493 494 495 496 497 |
} else list_del_init(&op->list); } mutex_unlock(&text_mutex); put_online_cpus(); } /* Reclaim all kprobes on the free_list */ |
7b959fc58 kprobes: Fix to f... |
498 |
static __kprobes void do_free_cleaned_kprobes(void) |
6274de498 kprobes: Support ... |
499 500 |
{ struct optimized_kprobe *op, *tmp; |
7b959fc58 kprobes: Fix to f... |
501 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
6274de498 kprobes: Support ... |
502 503 504 505 506 507 508 509 510 |
BUG_ON(!kprobe_unused(&op->kp)); list_del_init(&op->list); free_aggr_kprobe(&op->kp); } } /* Start optimizer after OPTIMIZE_DELAY passed */ static __kprobes void kick_kprobe_optimizer(void) { |
ad72b3bea kprobes: fix wait... |
511 |
schedule_delayed_work(&optimizing_work, OPTIMIZE_DELAY); |
6274de498 kprobes: Support ... |
512 |
} |
61f4e13ff kprobes: Separate... |
513 514 515 |
/* Kprobe jump optimizer */ static __kprobes void kprobe_optimizer(struct work_struct *work) { |
72ef3794c kprobes: Inverse ... |
516 |
mutex_lock(&kprobe_mutex); |
61f4e13ff kprobes: Separate... |
517 518 |
/* Lock modules while optimizing kprobes */ mutex_lock(&module_mutex); |
61f4e13ff kprobes: Separate... |
519 520 |
/* |
6274de498 kprobes: Support ... |
521 522 523 |
* Step 1: Unoptimize kprobes and collect cleaned (unused and disarmed) * kprobes before waiting for quiesence period. */ |
7b959fc58 kprobes: Fix to f... |
524 |
do_unoptimize_kprobes(); |
6274de498 kprobes: Support ... |
525 526 527 |
/* * Step 2: Wait for quiesence period to ensure all running interrupts |
61f4e13ff kprobes: Separate... |
528 529 530 531 532 533 |
* are done. Because optprobe may modify multiple instructions * there is a chance that Nth instruction is interrupted. In that * case, running interrupt can return to 2nd-Nth byte of jump * instruction. This wait is for avoiding it. */ synchronize_sched(); |
6274de498 kprobes: Support ... |
534 |
/* Step 3: Optimize kprobes after quiesence period */ |
61f4e13ff kprobes: Separate... |
535 |
do_optimize_kprobes(); |
6274de498 kprobes: Support ... |
536 537 |
/* Step 4: Free cleaned kprobes after quiesence period */ |
7b959fc58 kprobes: Fix to f... |
538 |
do_free_cleaned_kprobes(); |
6274de498 kprobes: Support ... |
539 |
|
afd66255b kprobes: Introduc... |
540 |
mutex_unlock(&module_mutex); |
72ef3794c kprobes: Inverse ... |
541 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
542 |
|
cd7ebe229 kprobes: Use text... |
543 |
/* Step 5: Kick optimizer again if needed */ |
f984ba4eb kprobes: Use text... |
544 |
if (!list_empty(&optimizing_list) || !list_empty(&unoptimizing_list)) |
cd7ebe229 kprobes: Use text... |
545 |
kick_kprobe_optimizer(); |
6274de498 kprobes: Support ... |
546 547 548 549 550 |
} /* Wait for completing optimization and unoptimization */ static __kprobes void wait_for_kprobe_optimizer(void) { |
ad72b3bea kprobes: fix wait... |
551 552 553 554 555 556 557 558 559 560 561 562 563 564 |
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... |
565 566 567 568 569 570 571 572 |
} /* Optimize kprobe if p is ready to be optimized */ static __kprobes void optimize_kprobe(struct kprobe *p) { struct optimized_kprobe *op; /* Check if the kprobe is disabled or not ready for optimization. */ |
b2be84df9 kprobes: Jump opt... |
573 |
if (!kprobe_optready(p) || !kprobes_allow_optimization || |
afd66255b kprobes: Introduc... |
574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 |
(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... |
590 |
op->kp.flags |= KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 |
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 */ static __kprobes void force_unoptimize_kprobe(struct optimized_kprobe *op) { get_online_cpus(); arch_unoptimize_kprobe(op); put_online_cpus(); if (kprobe_disabled(&op->kp)) arch_disarm_kprobe(&op->kp); |
afd66255b kprobes: Introduc... |
609 610 611 |
} /* Unoptimize a kprobe if p is optimized */ |
6274de498 kprobes: Support ... |
612 |
static __kprobes void unoptimize_kprobe(struct kprobe *p, bool force) |
afd66255b kprobes: Introduc... |
613 614 |
{ struct optimized_kprobe *op; |
6274de498 kprobes: Support ... |
615 616 617 618 619 620 621 622 623 624 625 626 |
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... |
627 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 |
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... |
646 647 |
} } |
0490cd1f9 kprobes: Reuse un... |
648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 |
/* 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... |
669 670 671 672 673 674 |
/* Remove optimized instructions */ static void __kprobes kill_optimized_kprobe(struct kprobe *p) { struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
6274de498 kprobes: Support ... |
675 676 |
if (!list_empty(&op->list)) /* Dequeue from the (un)optimization queue */ |
afd66255b kprobes: Introduc... |
677 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
678 |
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
7b959fc58 kprobes: Fix to f... |
679 680 681 682 683 684 685 686 687 688 689 |
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 ... |
690 |
/* Don't touch the code, because it is already freed. */ |
afd66255b kprobes: Introduc... |
691 692 693 694 695 696 697 698 699 700 701 |
arch_remove_optimized_kprobe(op); } /* Try to prepare optimized instructions */ static __kprobes void prepare_optimized_kprobe(struct kprobe *p) { struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); arch_prepare_optimized_kprobe(op); } |
afd66255b kprobes: Introduc... |
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 |
/* Allocate new optimized_kprobe and try to prepare optimized instructions */ static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p) { 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; arch_prepare_optimized_kprobe(op); return &op->kp; } static void __kprobes init_aggr_kprobe(struct kprobe *ap, struct kprobe *p); /* * Prepare an optimized_kprobe and optimize it * NOTE: p must be a normal registered kprobe */ static __kprobes void try_to_optimize_kprobe(struct kprobe *p) { struct kprobe *ap; struct optimized_kprobe *op; |
ae6aa16fd kprobes: introduc... |
728 729 730 |
/* Impossible to optimize ftrace-based kprobe */ if (kprobe_ftrace(p)) return; |
25764288d kprobes: Move loc... |
731 732 733 |
/* For preparing optimization, jump_label_text_reserved() is called */ jump_label_lock(); mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
734 735 |
ap = alloc_aggr_kprobe(p); if (!ap) |
25764288d kprobes: Move loc... |
736 |
goto out; |
afd66255b kprobes: Introduc... |
737 738 739 740 |
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 ... |
741 742 |
arch_remove_optimized_kprobe(op); kfree(op); |
25764288d kprobes: Move loc... |
743 |
goto out; |
afd66255b kprobes: Introduc... |
744 745 746 |
} init_aggr_kprobe(ap, p); |
25764288d kprobes: Move loc... |
747 748 749 750 751 |
optimize_kprobe(ap); /* This just kicks optimizer thread */ out: mutex_unlock(&text_mutex); jump_label_unlock(); |
afd66255b kprobes: Introduc... |
752 |
} |
b2be84df9 kprobes: Jump opt... |
753 754 755 756 |
#ifdef CONFIG_SYSCTL static void __kprobes optimize_all_kprobes(void) { struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
757 758 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
759 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
760 761 |
/* If optimization is already allowed, just return */ if (kprobes_allow_optimization) |
5c51543b0 kprobes: Fix a do... |
762 |
goto out; |
b2be84df9 kprobes: Jump opt... |
763 764 |
kprobes_allow_optimization = true; |
b2be84df9 kprobes: Jump opt... |
765 766 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
767 |
hlist_for_each_entry_rcu(p, head, hlist) |
b2be84df9 kprobes: Jump opt... |
768 769 770 |
if (!kprobe_disabled(p)) optimize_kprobe(p); } |
b2be84df9 kprobes: Jump opt... |
771 772 |
printk(KERN_INFO "Kprobes globally optimized "); |
5c51543b0 kprobes: Fix a do... |
773 774 |
out: mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
775 776 777 778 779 |
} static void __kprobes unoptimize_all_kprobes(void) { struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
780 781 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
782 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
783 |
/* If optimization is already prohibited, just return */ |
5c51543b0 kprobes: Fix a do... |
784 785 |
if (!kprobes_allow_optimization) { mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
786 |
return; |
5c51543b0 kprobes: Fix a do... |
787 |
} |
b2be84df9 kprobes: Jump opt... |
788 789 |
kprobes_allow_optimization = false; |
b2be84df9 kprobes: Jump opt... |
790 791 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
792 |
hlist_for_each_entry_rcu(p, head, hlist) { |
b2be84df9 kprobes: Jump opt... |
793 |
if (!kprobe_disabled(p)) |
6274de498 kprobes: Support ... |
794 |
unoptimize_kprobe(p, false); |
b2be84df9 kprobes: Jump opt... |
795 796 |
} } |
5c51543b0 kprobes: Fix a do... |
797 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
798 799 800 801 |
/* Wait for unoptimizing completion */ wait_for_kprobe_optimizer(); printk(KERN_INFO "Kprobes globally unoptimized "); |
b2be84df9 kprobes: Jump opt... |
802 |
} |
5c51543b0 kprobes: Fix a do... |
803 |
static DEFINE_MUTEX(kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
804 805 806 807 808 809 |
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... |
810 |
mutex_lock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
811 812 813 814 815 816 817 |
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... |
818 |
mutex_unlock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
819 820 821 822 |
return ret; } #endif /* CONFIG_SYSCTL */ |
6274de498 kprobes: Support ... |
823 |
/* Put a breakpoint for a probe. Must be called with text_mutex locked */ |
afd66255b kprobes: Introduc... |
824 825 |
static void __kprobes __arm_kprobe(struct kprobe *p) { |
6d8e40a85 kprobes: Rename o... |
826 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
827 828 |
/* Check collision with other optimized kprobes */ |
6d8e40a85 kprobes: Rename o... |
829 830 |
_p = get_optimized_kprobe((unsigned long)p->addr); if (unlikely(_p)) |
6274de498 kprobes: Support ... |
831 832 |
/* Fallback to unoptimized kprobe */ unoptimize_kprobe(_p, true); |
afd66255b kprobes: Introduc... |
833 834 835 836 |
arch_arm_kprobe(p); optimize_kprobe(p); /* Try to optimize (add kprobe to a list) */ } |
6274de498 kprobes: Support ... |
837 838 |
/* Remove the breakpoint of a probe. Must be called with text_mutex locked */ static void __kprobes __disarm_kprobe(struct kprobe *p, bool reopt) |
afd66255b kprobes: Introduc... |
839 |
{ |
6d8e40a85 kprobes: Rename o... |
840 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
841 |
|
6274de498 kprobes: Support ... |
842 |
unoptimize_kprobe(p, false); /* Try to unoptimize */ |
afd66255b kprobes: Introduc... |
843 |
|
6274de498 kprobes: Support ... |
844 845 846 847 848 849 850 851 |
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... |
852 853 854 855 856 |
} #else /* !CONFIG_OPTPROBES */ #define optimize_kprobe(p) do {} while (0) |
6274de498 kprobes: Support ... |
857 |
#define unoptimize_kprobe(p, f) do {} while (0) |
afd66255b kprobes: Introduc... |
858 859 860 861 |
#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 ... |
862 863 864 |
#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... |
865 |
|
0490cd1f9 kprobes: Reuse un... |
866 867 868 869 870 871 872 |
/* 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)); } |
afd66255b kprobes: Introduc... |
873 874 |
static __kprobes void free_aggr_kprobe(struct kprobe *p) { |
6274de498 kprobes: Support ... |
875 |
arch_remove_kprobe(p); |
afd66255b kprobes: Introduc... |
876 877 878 879 880 881 882 883 |
kfree(p); } static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p) { return kzalloc(sizeof(struct kprobe), GFP_KERNEL); } #endif /* CONFIG_OPTPROBES */ |
e7dbfe349 kprobes/x86: Move... |
884 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
885 |
static struct ftrace_ops kprobe_ftrace_ops __read_mostly = { |
e52538965 kprobes/x86: ftra... |
886 |
.func = kprobe_ftrace_handler, |
ae6aa16fd kprobes: introduc... |
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 |
.flags = FTRACE_OPS_FL_SAVE_REGS, }; static int kprobe_ftrace_enabled; /* Must ensure p->addr is really on ftrace */ static int __kprobes prepare_kprobe(struct kprobe *p) { if (!kprobe_ftrace(p)) return arch_prepare_kprobe(p); return arch_prepare_kprobe_ftrace(p); } /* Caller must lock kprobe_mutex */ static void __kprobes arm_kprobe_ftrace(struct kprobe *p) { 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 */ static void __kprobes disarm_kprobe_ftrace(struct kprobe *p) { 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... |
933 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
934 935 936 937 |
#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... |
938 939 940 |
/* Arm a kprobe with text_mutex */ static void __kprobes arm_kprobe(struct kprobe *kp) { |
ae6aa16fd kprobes: introduc... |
941 942 943 944 |
if (unlikely(kprobe_ftrace(kp))) { arm_kprobe_ftrace(kp); return; } |
afd66255b kprobes: Introduc... |
945 946 947 948 949 |
/* * Here, since __arm_kprobe() doesn't use stop_machine(), * this doesn't cause deadlock on text_mutex. So, we don't * need get_online_cpus(). */ |
201517a7f kprobes: fix to u... |
950 |
mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
951 |
__arm_kprobe(kp); |
201517a7f kprobes: fix to u... |
952 953 954 955 |
mutex_unlock(&text_mutex); } /* Disarm a kprobe with text_mutex */ |
ae6aa16fd kprobes: introduc... |
956 |
static void __kprobes disarm_kprobe(struct kprobe *kp, bool reopt) |
201517a7f kprobes: fix to u... |
957 |
{ |
ae6aa16fd kprobes: introduc... |
958 959 960 961 |
if (unlikely(kprobe_ftrace(kp))) { disarm_kprobe_ftrace(kp); return; } |
6274de498 kprobes: Support ... |
962 |
/* Ditto */ |
201517a7f kprobes: fix to u... |
963 |
mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
964 |
__disarm_kprobe(kp, reopt); |
201517a7f kprobes: fix to u... |
965 966 |
mutex_unlock(&text_mutex); } |
64f562c6d [PATCH] kprobes: ... |
967 968 969 970 |
/* * Aggregate handlers for multiple kprobes support - these handlers * take care of invoking the individual kprobe handlers on p->list */ |
d0aaff979 [PATCH] Kprobes: ... |
971 |
static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs) |
64f562c6d [PATCH] kprobes: ... |
972 973 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
974 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
975 |
if (kp->pre_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
976 |
set_kprobe_instance(kp); |
8b0914ea7 [PATCH] jprobes: ... |
977 978 |
if (kp->pre_handler(kp, regs)) return 1; |
64f562c6d [PATCH] kprobes: ... |
979 |
} |
e65845235 [PATCH] Kprobes: ... |
980 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
981 982 983 |
} return 0; } |
d0aaff979 [PATCH] Kprobes: ... |
984 985 |
static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) |
64f562c6d [PATCH] kprobes: ... |
986 987 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
988 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
989 |
if (kp->post_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
990 |
set_kprobe_instance(kp); |
64f562c6d [PATCH] kprobes: ... |
991 |
kp->post_handler(kp, regs, flags); |
e65845235 [PATCH] Kprobes: ... |
992 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
993 994 |
} } |
64f562c6d [PATCH] kprobes: ... |
995 |
} |
d0aaff979 [PATCH] Kprobes: ... |
996 997 |
static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs, int trapnr) |
64f562c6d [PATCH] kprobes: ... |
998 |
{ |
b76834bc1 kprobes: Use this... |
999 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1000 |
|
64f562c6d [PATCH] kprobes: ... |
1001 1002 1003 1004 |
/* * if we faulted "during" the execution of a user specified * probe handler, invoke just that probe's fault handler */ |
e65845235 [PATCH] Kprobes: ... |
1005 1006 |
if (cur && cur->fault_handler) { if (cur->fault_handler(cur, regs, trapnr)) |
64f562c6d [PATCH] kprobes: ... |
1007 1008 1009 1010 |
return 1; } return 0; } |
d0aaff979 [PATCH] Kprobes: ... |
1011 |
static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs) |
8b0914ea7 [PATCH] jprobes: ... |
1012 |
{ |
b76834bc1 kprobes: Use this... |
1013 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1014 1015 1016 1017 1018 |
int ret = 0; if (cur && cur->break_handler) { if (cur->break_handler(cur, regs)) ret = 1; |
8b0914ea7 [PATCH] jprobes: ... |
1019 |
} |
e65845235 [PATCH] Kprobes: ... |
1020 1021 |
reset_kprobe_instance(); return ret; |
8b0914ea7 [PATCH] jprobes: ... |
1022 |
} |
bf8d5c52c [PATCH] kprobes: ... |
1023 1024 1025 1026 |
/* Walks the list and increments nmissed count for multiprobe case */ void __kprobes kprobes_inc_nmissed_count(struct kprobe *p) { struct kprobe *kp; |
afd66255b kprobes: Introduc... |
1027 |
if (!kprobe_aggrprobe(p)) { |
bf8d5c52c [PATCH] kprobes: ... |
1028 1029 1030 1031 1032 1033 1034 |
p->nmissed++; } else { list_for_each_entry_rcu(kp, &p->list, list) kp->nmissed++; } return; } |
99219a3fb [PATCH] kretprobe... |
1035 1036 |
void __kprobes recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head) |
b94cce926 [PATCH] kprobes: ... |
1037 |
{ |
ef53d9c5e kprobes: improve ... |
1038 |
struct kretprobe *rp = ri->rp; |
b94cce926 [PATCH] kprobes: ... |
1039 1040 |
/* remove rp inst off the rprobe_inst_table */ hlist_del(&ri->hlist); |
ef53d9c5e kprobes: improve ... |
1041 1042 |
INIT_HLIST_NODE(&ri->hlist); if (likely(rp)) { |
ec484608c locking, kprobes:... |
1043 |
raw_spin_lock(&rp->lock); |
ef53d9c5e kprobes: improve ... |
1044 |
hlist_add_head(&ri->hlist, &rp->free_instances); |
ec484608c locking, kprobes:... |
1045 |
raw_spin_unlock(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1046 1047 |
} else /* Unregistering */ |
99219a3fb [PATCH] kretprobe... |
1048 |
hlist_add_head(&ri->hlist, head); |
b94cce926 [PATCH] kprobes: ... |
1049 |
} |
017c39bdb kprobes: add __kp... |
1050 |
void __kprobes kretprobe_hash_lock(struct task_struct *tsk, |
ef53d9c5e kprobes: improve ... |
1051 |
struct hlist_head **head, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1052 |
__acquires(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1053 1054 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1055 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1056 1057 1058 |
*head = &kretprobe_inst_table[hash]; hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1059 |
raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1060 |
} |
017c39bdb kprobes: add __kp... |
1061 1062 |
static void __kprobes kretprobe_table_lock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1063 |
__acquires(hlist_lock) |
b94cce926 [PATCH] kprobes: ... |
1064 |
{ |
ec484608c locking, kprobes:... |
1065 1066 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1067 |
} |
017c39bdb kprobes: add __kp... |
1068 1069 |
void __kprobes kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1070 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1071 1072 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1073 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1074 1075 |
hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1076 |
raw_spin_unlock_irqrestore(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1077 |
} |
6376b2297 kprobes: Make fun... |
1078 1079 |
static void __kprobes kretprobe_table_unlock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1080 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1081 |
{ |
ec484608c locking, kprobes:... |
1082 1083 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_unlock_irqrestore(hlist_lock, *flags); |
b94cce926 [PATCH] kprobes: ... |
1084 |
} |
b94cce926 [PATCH] kprobes: ... |
1085 |
/* |
c6fd91f0b [PATCH] kretprobe... |
1086 1087 1088 1089 |
* 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: ... |
1090 |
*/ |
d0aaff979 [PATCH] Kprobes: ... |
1091 |
void __kprobes kprobe_flush_task(struct task_struct *tk) |
b94cce926 [PATCH] kprobes: ... |
1092 |
{ |
62c27be0d [PATCH] kprobe wh... |
1093 |
struct kretprobe_instance *ri; |
99219a3fb [PATCH] kretprobe... |
1094 |
struct hlist_head *head, empty_rp; |
b67bfe0d4 hlist: drop the n... |
1095 |
struct hlist_node *tmp; |
ef53d9c5e kprobes: improve ... |
1096 |
unsigned long hash, flags = 0; |
802eae7c8 [PATCH] Return pr... |
1097 |
|
ef53d9c5e kprobes: improve ... |
1098 1099 1100 |
if (unlikely(!kprobes_initialized)) /* Early boot. kretprobe_table_locks not yet initialized. */ return; |
d496aab56 kprobes: initiali... |
1101 |
INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5e kprobes: improve ... |
1102 1103 1104 |
hash = hash_ptr(tk, KPROBE_HASH_BITS); head = &kretprobe_inst_table[hash]; kretprobe_table_lock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1105 |
hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
62c27be0d [PATCH] kprobe wh... |
1106 |
if (ri->task == tk) |
99219a3fb [PATCH] kretprobe... |
1107 |
recycle_rp_inst(ri, &empty_rp); |
62c27be0d [PATCH] kprobe wh... |
1108 |
} |
ef53d9c5e kprobes: improve ... |
1109 |
kretprobe_table_unlock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1110 |
hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3fb [PATCH] kretprobe... |
1111 1112 1113 |
hlist_del(&ri->hlist); kfree(ri); } |
b94cce926 [PATCH] kprobes: ... |
1114 |
} |
b94cce926 [PATCH] kprobes: ... |
1115 1116 1117 |
static inline void free_rp_inst(struct kretprobe *rp) { struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1118 |
struct hlist_node *next; |
4c4308cb9 kprobes: kretprob... |
1119 |
|
b67bfe0d4 hlist: drop the n... |
1120 |
hlist_for_each_entry_safe(ri, next, &rp->free_instances, hlist) { |
ef53d9c5e kprobes: improve ... |
1121 |
hlist_del(&ri->hlist); |
b94cce926 [PATCH] kprobes: ... |
1122 1123 1124 |
kfree(ri); } } |
4a296e07c kprobes: add (un)... |
1125 1126 |
static void __kprobes cleanup_rp_inst(struct kretprobe *rp) { |
ef53d9c5e kprobes: improve ... |
1127 |
unsigned long flags, hash; |
4a296e07c kprobes: add (un)... |
1128 |
struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1129 |
struct hlist_node *next; |
ef53d9c5e kprobes: improve ... |
1130 |
struct hlist_head *head; |
4a296e07c kprobes: add (un)... |
1131 |
/* No race here */ |
ef53d9c5e kprobes: improve ... |
1132 1133 1134 |
for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) { kretprobe_table_lock(hash, &flags); head = &kretprobe_inst_table[hash]; |
b67bfe0d4 hlist: drop the n... |
1135 |
hlist_for_each_entry_safe(ri, next, head, hlist) { |
ef53d9c5e kprobes: improve ... |
1136 1137 1138 1139 |
if (ri->rp == rp) ri->rp = NULL; } kretprobe_table_unlock(hash, &flags); |
4a296e07c kprobes: add (un)... |
1140 |
} |
4a296e07c kprobes: add (un)... |
1141 1142 |
free_rp_inst(rp); } |
64f562c6d [PATCH] kprobes: ... |
1143 |
/* |
b918e5e60 kprobes: cleanup ... |
1144 |
* Add the new probe to ap->list. Fail if this is the |
8b0914ea7 [PATCH] jprobes: ... |
1145 1146 |
* second jprobe at the address - two jprobes can't coexist */ |
b918e5e60 kprobes: cleanup ... |
1147 |
static int __kprobes add_new_kprobe(struct kprobe *ap, struct kprobe *p) |
8b0914ea7 [PATCH] jprobes: ... |
1148 |
{ |
de5bd88d5 kprobes: support ... |
1149 |
BUG_ON(kprobe_gone(ap) || kprobe_gone(p)); |
afd66255b kprobes: Introduc... |
1150 1151 |
if (p->break_handler || p->post_handler) |
6274de498 kprobes: Support ... |
1152 |
unoptimize_kprobe(ap, true); /* Fall back to normal kprobe */ |
afd66255b kprobes: Introduc... |
1153 |
|
8b0914ea7 [PATCH] jprobes: ... |
1154 |
if (p->break_handler) { |
b918e5e60 kprobes: cleanup ... |
1155 |
if (ap->break_handler) |
367216567 [PATCH] Kprobe: m... |
1156 |
return -EEXIST; |
b918e5e60 kprobes: cleanup ... |
1157 1158 |
list_add_tail_rcu(&p->list, &ap->list); ap->break_handler = aggr_break_handler; |
8b0914ea7 [PATCH] jprobes: ... |
1159 |
} else |
b918e5e60 kprobes: cleanup ... |
1160 1161 1162 |
list_add_rcu(&p->list, &ap->list); if (p->post_handler && !ap->post_handler) ap->post_handler = aggr_post_handler; |
de5bd88d5 kprobes: support ... |
1163 |
|
8b0914ea7 [PATCH] jprobes: ... |
1164 1165 1166 1167 |
return 0; } /* |
64f562c6d [PATCH] kprobes: ... |
1168 1169 1170 |
* Fill in the required fields of the "manager kprobe". Replace the * earlier kprobe in the hlist with the manager kprobe */ |
afd66255b kprobes: Introduc... |
1171 |
static void __kprobes init_aggr_kprobe(struct kprobe *ap, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1172 |
{ |
afd66255b kprobes: Introduc... |
1173 |
/* Copy p's insn slot to ap */ |
8b0914ea7 [PATCH] jprobes: ... |
1174 |
copy_kprobe(p, ap); |
a9ad965ea [PATCH] IA64: kpr... |
1175 |
flush_insn_slot(ap); |
64f562c6d [PATCH] kprobes: ... |
1176 |
ap->addr = p->addr; |
afd66255b kprobes: Introduc... |
1177 |
ap->flags = p->flags & ~KPROBE_FLAG_OPTIMIZED; |
64f562c6d [PATCH] kprobes: ... |
1178 |
ap->pre_handler = aggr_pre_handler; |
64f562c6d [PATCH] kprobes: ... |
1179 |
ap->fault_handler = aggr_fault_handler; |
e8386a0cb kprobes: support ... |
1180 1181 |
/* We don't care the kprobe which has gone. */ if (p->post_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1182 |
ap->post_handler = aggr_post_handler; |
e8386a0cb kprobes: support ... |
1183 |
if (p->break_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1184 |
ap->break_handler = aggr_break_handler; |
64f562c6d [PATCH] kprobes: ... |
1185 1186 |
INIT_LIST_HEAD(&ap->list); |
afd66255b kprobes: Introduc... |
1187 |
INIT_HLIST_NODE(&ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1188 |
|
afd66255b kprobes: Introduc... |
1189 |
list_add_rcu(&p->list, &ap->list); |
adad0f331 [PATCH] kprobes: ... |
1190 |
hlist_replace_rcu(&p->hlist, &ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1191 1192 1193 1194 1195 |
} /* * This is the second or subsequent kprobe at the address - handle * the intricacies |
64f562c6d [PATCH] kprobes: ... |
1196 |
*/ |
6d8e40a85 kprobes: Rename o... |
1197 |
static int __kprobes register_aggr_kprobe(struct kprobe *orig_p, |
d0aaff979 [PATCH] Kprobes: ... |
1198 |
struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1199 1200 |
{ int ret = 0; |
6d8e40a85 kprobes: Rename o... |
1201 |
struct kprobe *ap = orig_p; |
64f562c6d [PATCH] kprobes: ... |
1202 |
|
25764288d kprobes: Move loc... |
1203 1204 1205 1206 1207 1208 1209 1210 |
/* For preparing optimization, jump_label_text_reserved() is called */ jump_label_lock(); /* * Get online CPUs to avoid text_mutex deadlock.with stop machine, * which is invoked by unoptimize_kprobe() in add_new_kprobe() */ get_online_cpus(); mutex_lock(&text_mutex); |
6d8e40a85 kprobes: Rename o... |
1211 1212 1213 |
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... |
1214 1215 1216 1217 |
if (!ap) { ret = -ENOMEM; goto out; } |
6d8e40a85 kprobes: Rename o... |
1218 |
init_aggr_kprobe(ap, orig_p); |
6274de498 kprobes: Support ... |
1219 |
} else if (kprobe_unused(ap)) |
0490cd1f9 kprobes: Reuse un... |
1220 1221 |
/* This probe is going to die. Rescue it */ reuse_unused_kprobe(ap); |
b918e5e60 kprobes: cleanup ... |
1222 1223 |
if (kprobe_gone(ap)) { |
e8386a0cb kprobes: support ... |
1224 1225 1226 1227 1228 1229 |
/* * 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 ... |
1230 |
ret = arch_prepare_kprobe(ap); |
e8386a0cb kprobes: support ... |
1231 |
if (ret) |
b918e5e60 kprobes: cleanup ... |
1232 1233 1234 1235 1236 |
/* * 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... |
1237 |
goto out; |
de5bd88d5 kprobes: support ... |
1238 |
|
afd66255b kprobes: Introduc... |
1239 1240 |
/* Prepare optimized instructions if possible. */ prepare_optimized_kprobe(ap); |
e8386a0cb kprobes: support ... |
1241 |
/* |
de5bd88d5 kprobes: support ... |
1242 1243 |
* Clear gone flag to prevent allocating new slot again, and * set disabled flag because it is not armed yet. |
e8386a0cb kprobes: support ... |
1244 |
*/ |
de5bd88d5 kprobes: support ... |
1245 1246 |
ap->flags = (ap->flags & ~KPROBE_FLAG_GONE) | KPROBE_FLAG_DISABLED; |
e8386a0cb kprobes: support ... |
1247 |
} |
b918e5e60 kprobes: cleanup ... |
1248 |
|
afd66255b kprobes: Introduc... |
1249 |
/* Copy ap's insn slot to p */ |
b918e5e60 kprobes: cleanup ... |
1250 |
copy_kprobe(ap, p); |
25764288d kprobes: Move loc... |
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 |
ret = add_new_kprobe(ap, p); out: mutex_unlock(&text_mutex); put_online_cpus(); jump_label_unlock(); 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: ... |
1265 |
} |
d0aaff979 [PATCH] Kprobes: ... |
1266 1267 |
static int __kprobes in_kprobes_functions(unsigned long addr) { |
3d8d996e0 kprobes: prevent ... |
1268 |
struct kprobe_blackpoint *kb; |
6f716acd5 kprobes: codingst... |
1269 1270 |
if (addr >= (unsigned long)__kprobes_text_start && addr < (unsigned long)__kprobes_text_end) |
d0aaff979 [PATCH] Kprobes: ... |
1271 |
return -EINVAL; |
3d8d996e0 kprobes: prevent ... |
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 |
/* * If there exists a kprobe_blacklist, verify and * fail any probe registration in the prohibited area */ for (kb = kprobe_blacklist; kb->name != NULL; kb++) { if (kb->start_addr) { if (addr >= kb->start_addr && addr < (kb->start_addr + kb->range)) return -EINVAL; } } |
d0aaff979 [PATCH] Kprobes: ... |
1283 1284 |
return 0; } |
b2a5cd693 kprobes: fix a nu... |
1285 1286 1287 |
/* * 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 -... |
1288 1289 |
* This returns encoded errors if it fails to look up symbol or invalid * combination of parameters. |
b2a5cd693 kprobes: fix a nu... |
1290 1291 1292 1293 |
*/ static kprobe_opcode_t __kprobes *kprobe_addr(struct kprobe *p) { kprobe_opcode_t *addr = p->addr; |
bc81d48d1 kprobes: Return -... |
1294 1295 1296 1297 |
if ((p->symbol_name && p->addr) || (!p->symbol_name && !p->addr)) goto invalid; |
b2a5cd693 kprobes: fix a nu... |
1298 |
if (p->symbol_name) { |
b2a5cd693 kprobes: fix a nu... |
1299 |
kprobe_lookup_name(p->symbol_name, addr); |
bc81d48d1 kprobes: Return -... |
1300 1301 |
if (!addr) return ERR_PTR(-ENOENT); |
b2a5cd693 kprobes: fix a nu... |
1302 |
} |
bc81d48d1 kprobes: Return -... |
1303 1304 1305 1306 1307 1308 |
addr = (kprobe_opcode_t *)(((char *)addr) + p->offset); if (addr) return addr; invalid: return ERR_PTR(-EINVAL); |
b2a5cd693 kprobes: fix a nu... |
1309 |
} |
1f0ab4097 kprobes: Prevent ... |
1310 1311 1312 |
/* Check passed kprobe is valid and return kprobe in kprobe_table. */ static struct kprobe * __kprobes __get_valid_kprobe(struct kprobe *p) { |
6d8e40a85 kprobes: Rename o... |
1313 |
struct kprobe *ap, *list_p; |
1f0ab4097 kprobes: Prevent ... |
1314 |
|
6d8e40a85 kprobes: Rename o... |
1315 1316 |
ap = get_kprobe(p->addr); if (unlikely(!ap)) |
1f0ab4097 kprobes: Prevent ... |
1317 |
return NULL; |
6d8e40a85 kprobes: Rename o... |
1318 1319 |
if (p != ap) { list_for_each_entry_rcu(list_p, &ap->list, list) |
1f0ab4097 kprobes: Prevent ... |
1320 1321 1322 1323 1324 1325 |
if (list_p == p) /* kprobe p is a valid probe */ goto valid; return NULL; } valid: |
6d8e40a85 kprobes: Rename o... |
1326 |
return ap; |
1f0ab4097 kprobes: Prevent ... |
1327 1328 1329 1330 1331 1332 |
} /* Return error if the kprobe is being re-registered */ static inline int check_kprobe_rereg(struct kprobe *p) { int ret = 0; |
1f0ab4097 kprobes: Prevent ... |
1333 1334 |
mutex_lock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1335 |
if (__get_valid_kprobe(p)) |
1f0ab4097 kprobes: Prevent ... |
1336 1337 |
ret = -EINVAL; mutex_unlock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1338 |
|
1f0ab4097 kprobes: Prevent ... |
1339 1340 |
return ret; } |
f7fa6ef0d kprobes: cleanup ... |
1341 1342 |
static __kprobes int check_kprobe_address_safe(struct kprobe *p, struct module **probed_mod) |
1da177e4c Linux-2.6.12-rc2 |
1343 1344 |
{ int ret = 0; |
ae6aa16fd kprobes: introduc... |
1345 1346 1347 1348 1349 1350 1351 1352 |
unsigned long ftrace_addr; /* * If the address is located on a ftrace nop, set the * breakpoint to the following instruction. */ ftrace_addr = ftrace_location((unsigned long)p->addr); if (ftrace_addr) { |
e7dbfe349 kprobes/x86: Move... |
1353 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
1354 1355 1356 |
/* Given address is not on the instruction boundary */ if ((unsigned long)p->addr != ftrace_addr) return -EILSEQ; |
ae6aa16fd kprobes: introduc... |
1357 |
p->flags |= KPROBE_FLAG_FTRACE; |
e7dbfe349 kprobes/x86: Move... |
1358 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
1359 1360 1361 |
return -EINVAL; #endif } |
1f0ab4097 kprobes: Prevent ... |
1362 |
|
91bad2f8d jump label: Fix d... |
1363 |
jump_label_lock(); |
de31c3ca8 jump label: Fix e... |
1364 |
preempt_disable(); |
f7fa6ef0d kprobes: cleanup ... |
1365 1366 |
/* Ensure it is not in reserved area nor out of text */ |
ec30c5f3a kprobes: Use kern... |
1367 |
if (!kernel_text_address((unsigned long) p->addr) || |
4554dbcb8 kprobes: Check pr... |
1368 |
in_kprobes_functions((unsigned long) p->addr) || |
f986a499e kprobes: return p... |
1369 1370 |
jump_label_text_reserved(p->addr, p->addr)) { ret = -EINVAL; |
f7fa6ef0d kprobes: cleanup ... |
1371 |
goto out; |
f986a499e kprobes: return p... |
1372 |
} |
b3e55c727 [PATCH] Kprobes: ... |
1373 |
|
f7fa6ef0d kprobes: cleanup ... |
1374 1375 1376 |
/* Check if are we probing a module */ *probed_mod = __module_text_address((unsigned long) p->addr); if (*probed_mod) { |
6f716acd5 kprobes: codingst... |
1377 |
/* |
e8386a0cb kprobes: support ... |
1378 1379 |
* We must hold a refcount of the probed module while updating * its code to prohibit unexpected unloading. |
df019b1d8 [PATCH] kprobes: ... |
1380 |
*/ |
f7fa6ef0d kprobes: cleanup ... |
1381 1382 1383 1384 |
if (unlikely(!try_module_get(*probed_mod))) { ret = -ENOENT; goto out; } |
de31c3ca8 jump label: Fix e... |
1385 |
|
f24659d96 kprobes: support ... |
1386 1387 1388 1389 |
/* * If the module freed .init.text, we couldn't insert * kprobes in there. */ |
f7fa6ef0d kprobes: cleanup ... |
1390 1391 1392 1393 1394 |
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 ... |
1395 |
} |
df019b1d8 [PATCH] kprobes: ... |
1396 |
} |
f7fa6ef0d kprobes: cleanup ... |
1397 |
out: |
a189d0350 kprobes: disable ... |
1398 |
preempt_enable(); |
de31c3ca8 jump label: Fix e... |
1399 |
jump_label_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1400 |
|
f7fa6ef0d kprobes: cleanup ... |
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 |
return ret; } int __kprobes register_kprobe(struct kprobe *p) { 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: ... |
1423 |
p->nmissed = 0; |
9861668f7 kprobes: add (un)... |
1424 |
INIT_LIST_HEAD(&p->list); |
afd66255b kprobes: Introduc... |
1425 |
|
f7fa6ef0d kprobes: cleanup ... |
1426 1427 1428 1429 1430 |
ret = check_kprobe_address_safe(p, &probed_mod); if (ret) return ret; mutex_lock(&kprobe_mutex); |
afd66255b kprobes: Introduc... |
1431 |
|
64f562c6d [PATCH] kprobes: ... |
1432 1433 |
old_p = get_kprobe(p->addr); if (old_p) { |
afd66255b kprobes: Introduc... |
1434 |
/* Since this may unoptimize old_p, locking text_mutex. */ |
64f562c6d [PATCH] kprobes: ... |
1435 |
ret = register_aggr_kprobe(old_p, p); |
1da177e4c Linux-2.6.12-rc2 |
1436 1437 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
1438 |
|
25764288d kprobes: Move loc... |
1439 |
mutex_lock(&text_mutex); /* Avoiding text modification */ |
ae6aa16fd kprobes: introduc... |
1440 |
ret = prepare_kprobe(p); |
25764288d kprobes: Move loc... |
1441 |
mutex_unlock(&text_mutex); |
6f716acd5 kprobes: codingst... |
1442 |
if (ret) |
afd66255b kprobes: Introduc... |
1443 |
goto out; |
49a2a1b83 [PATCH] kprobes: ... |
1444 |
|
64f562c6d [PATCH] kprobes: ... |
1445 |
INIT_HLIST_NODE(&p->hlist); |
3516a4604 [PATCH] Kprobes: ... |
1446 |
hlist_add_head_rcu(&p->hlist, |
1da177e4c Linux-2.6.12-rc2 |
1447 |
&kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]); |
de5bd88d5 kprobes: support ... |
1448 |
if (!kprobes_all_disarmed && !kprobe_disabled(p)) |
25764288d kprobes: Move loc... |
1449 |
arm_kprobe(p); |
afd66255b kprobes: Introduc... |
1450 1451 1452 |
/* Try to optimize kprobe */ try_to_optimize_kprobe(p); |
74a0b5762 x86: optimize pag... |
1453 |
|
1da177e4c Linux-2.6.12-rc2 |
1454 |
out: |
7a7d1cf95 [PATCH] sem2mutex... |
1455 |
mutex_unlock(&kprobe_mutex); |
49a2a1b83 [PATCH] kprobes: ... |
1456 |
|
e8386a0cb kprobes: support ... |
1457 |
if (probed_mod) |
df019b1d8 [PATCH] kprobes: ... |
1458 |
module_put(probed_mod); |
e8386a0cb kprobes: support ... |
1459 |
|
1da177e4c Linux-2.6.12-rc2 |
1460 1461 |
return ret; } |
99081ab55 kprobes: move EXP... |
1462 |
EXPORT_SYMBOL_GPL(register_kprobe); |
1da177e4c Linux-2.6.12-rc2 |
1463 |
|
6f0f1dd71 kprobes: Cleanup ... |
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 |
/* Check if all probes on the aggrprobe are disabled */ static int __kprobes aggr_kprobe_disabled(struct kprobe *ap) { 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 */ static struct kprobe *__kprobes __disable_kprobe(struct kprobe *p) { 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)) { |
ae6aa16fd kprobes: introduc... |
1497 |
disarm_kprobe(orig_p, true); |
6f0f1dd71 kprobes: Cleanup ... |
1498 1499 1500 1501 1502 1503 |
orig_p->flags |= KPROBE_FLAG_DISABLED; } } return orig_p; } |
de5bd88d5 kprobes: support ... |
1504 1505 1506 1507 1508 |
/* * Unregister a kprobe without a scheduler synchronization. */ static int __kprobes __unregister_kprobe_top(struct kprobe *p) { |
6d8e40a85 kprobes: Rename o... |
1509 |
struct kprobe *ap, *list_p; |
de5bd88d5 kprobes: support ... |
1510 |
|
6f0f1dd71 kprobes: Cleanup ... |
1511 1512 |
/* Disable kprobe. This will disarm it if needed. */ ap = __disable_kprobe(p); |
6d8e40a85 kprobes: Rename o... |
1513 |
if (ap == NULL) |
de5bd88d5 kprobes: support ... |
1514 |
return -EINVAL; |
6f0f1dd71 kprobes: Cleanup ... |
1515 |
if (ap == p) |
bf8f6e5b3 Kprobes: The ON/O... |
1516 |
/* |
6f0f1dd71 kprobes: Cleanup ... |
1517 1518 |
* This probe is an independent(and non-optimized) kprobe * (not an aggrprobe). Remove from the hash list. |
bf8f6e5b3 Kprobes: The ON/O... |
1519 |
*/ |
6f0f1dd71 kprobes: Cleanup ... |
1520 1521 1522 1523 |
goto disarmed; /* Following process expects this probe is an aggrprobe */ WARN_ON(!kprobe_aggrprobe(ap)); |
6274de498 kprobes: Support ... |
1524 1525 1526 1527 1528 |
if (list_is_singular(&ap->list) && kprobe_disarmed(ap)) /* * !disarmed could be happen if the probe is under delayed * unoptimizing. */ |
6f0f1dd71 kprobes: Cleanup ... |
1529 1530 1531 |
goto disarmed; else { /* If disabling probe has special handlers, update aggrprobe */ |
e8386a0cb kprobes: support ... |
1532 |
if (p->break_handler && !kprobe_gone(p)) |
6d8e40a85 kprobes: Rename o... |
1533 |
ap->break_handler = NULL; |
e8386a0cb kprobes: support ... |
1534 |
if (p->post_handler && !kprobe_gone(p)) { |
6d8e40a85 kprobes: Rename o... |
1535 |
list_for_each_entry_rcu(list_p, &ap->list, list) { |
9861668f7 kprobes: add (un)... |
1536 1537 1538 |
if ((list_p != p) && (list_p->post_handler)) goto noclean; } |
6d8e40a85 kprobes: Rename o... |
1539 |
ap->post_handler = NULL; |
9861668f7 kprobes: add (un)... |
1540 1541 |
} noclean: |
6f0f1dd71 kprobes: Cleanup ... |
1542 1543 1544 1545 |
/* * Remove from the aggrprobe: this path will do nothing in * __unregister_kprobe_bottom(). */ |
49a2a1b83 [PATCH] kprobes: ... |
1546 |
list_del_rcu(&p->list); |
6f0f1dd71 kprobes: Cleanup ... |
1547 1548 1549 1550 1551 1552 |
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: ... |
1553 |
} |
9861668f7 kprobes: add (un)... |
1554 |
return 0; |
6f0f1dd71 kprobes: Cleanup ... |
1555 1556 |
disarmed: |
6274de498 kprobes: Support ... |
1557 |
BUG_ON(!kprobe_disarmed(ap)); |
6f0f1dd71 kprobes: Cleanup ... |
1558 1559 |
hlist_del_rcu(&ap->hlist); return 0; |
9861668f7 kprobes: add (un)... |
1560 |
} |
3516a4604 [PATCH] Kprobes: ... |
1561 |
|
9861668f7 kprobes: add (un)... |
1562 1563 |
static void __kprobes __unregister_kprobe_bottom(struct kprobe *p) { |
6d8e40a85 kprobes: Rename o... |
1564 |
struct kprobe *ap; |
b3e55c727 [PATCH] Kprobes: ... |
1565 |
|
e8386a0cb kprobes: support ... |
1566 |
if (list_empty(&p->list)) |
6274de498 kprobes: Support ... |
1567 |
/* This is an independent kprobe */ |
0498b6350 [PATCH] kprobes: ... |
1568 |
arch_remove_kprobe(p); |
e8386a0cb kprobes: support ... |
1569 |
else if (list_is_singular(&p->list)) { |
6274de498 kprobes: Support ... |
1570 |
/* This is the last child of an aggrprobe */ |
6d8e40a85 kprobes: Rename o... |
1571 |
ap = list_entry(p->list.next, struct kprobe, list); |
e8386a0cb kprobes: support ... |
1572 |
list_del(&p->list); |
6d8e40a85 kprobes: Rename o... |
1573 |
free_aggr_kprobe(ap); |
9861668f7 kprobes: add (un)... |
1574 |
} |
6274de498 kprobes: Support ... |
1575 |
/* Otherwise, do nothing. */ |
9861668f7 kprobes: add (un)... |
1576 |
} |
49ad2fd76 kprobes: remove c... |
1577 |
int __kprobes register_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1578 1579 1580 1581 1582 1583 |
{ int i, ret = 0; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1584 |
ret = register_kprobe(kps[i]); |
67dddaad5 kprobes: fix erro... |
1585 1586 1587 |
if (ret < 0) { if (i > 0) unregister_kprobes(kps, i); |
9861668f7 kprobes: add (un)... |
1588 |
break; |
367216567 [PATCH] Kprobe: m... |
1589 |
} |
49a2a1b83 [PATCH] kprobes: ... |
1590 |
} |
9861668f7 kprobes: add (un)... |
1591 1592 |
return ret; } |
99081ab55 kprobes: move EXP... |
1593 |
EXPORT_SYMBOL_GPL(register_kprobes); |
9861668f7 kprobes: add (un)... |
1594 |
|
9861668f7 kprobes: add (un)... |
1595 1596 1597 1598 |
void __kprobes unregister_kprobe(struct kprobe *p) { unregister_kprobes(&p, 1); } |
99081ab55 kprobes: move EXP... |
1599 |
EXPORT_SYMBOL_GPL(unregister_kprobe); |
9861668f7 kprobes: add (un)... |
1600 |
|
9861668f7 kprobes: add (un)... |
1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 |
void __kprobes unregister_kprobes(struct kprobe **kps, int num) { 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 |
1617 |
} |
99081ab55 kprobes: move EXP... |
1618 |
EXPORT_SYMBOL_GPL(unregister_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
1619 1620 1621 |
static struct notifier_block kprobe_exceptions_nb = { .notifier_call = kprobe_exceptions_notify, |
3d5631e06 [PATCH] Kprobes r... |
1622 1623 |
.priority = 0x7fffffff /* we need to be notified first */ }; |
3d7e33825 jprobes: make jpr... |
1624 1625 1626 1627 |
unsigned long __weak arch_deref_entry_point(void *entry) { return (unsigned long)entry; } |
1da177e4c Linux-2.6.12-rc2 |
1628 |
|
49ad2fd76 kprobes: remove c... |
1629 |
int __kprobes register_jprobes(struct jprobe **jps, int num) |
1da177e4c Linux-2.6.12-rc2 |
1630 |
{ |
26b31c190 kprobes: add (un)... |
1631 1632 |
struct jprobe *jp; int ret = 0, i; |
3d7e33825 jprobes: make jpr... |
1633 |
|
26b31c190 kprobes: add (un)... |
1634 |
if (num <= 0) |
3d7e33825 jprobes: make jpr... |
1635 |
return -EINVAL; |
26b31c190 kprobes: add (un)... |
1636 |
for (i = 0; i < num; i++) { |
05662bdb6 kprobes: Verify j... |
1637 |
unsigned long addr, offset; |
26b31c190 kprobes: add (un)... |
1638 1639 |
jp = jps[i]; addr = arch_deref_entry_point(jp->entry); |
05662bdb6 kprobes: Verify j... |
1640 1641 1642 1643 1644 1645 1646 1647 |
/* Verify probepoint is a function entry point */ if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0) { jp->kp.pre_handler = setjmp_pre_handler; jp->kp.break_handler = longjmp_break_handler; ret = register_kprobe(&jp->kp); } else ret = -EINVAL; |
edbaadbe4 kprobes: Remove r... |
1648 |
|
67dddaad5 kprobes: fix erro... |
1649 1650 1651 |
if (ret < 0) { if (i > 0) unregister_jprobes(jps, i); |
26b31c190 kprobes: add (un)... |
1652 1653 1654 1655 1656 |
break; } } return ret; } |
99081ab55 kprobes: move EXP... |
1657 |
EXPORT_SYMBOL_GPL(register_jprobes); |
3d7e33825 jprobes: make jpr... |
1658 |
|
26b31c190 kprobes: add (un)... |
1659 1660 |
int __kprobes register_jprobe(struct jprobe *jp) { |
49ad2fd76 kprobes: remove c... |
1661 |
return register_jprobes(&jp, 1); |
1da177e4c Linux-2.6.12-rc2 |
1662 |
} |
99081ab55 kprobes: move EXP... |
1663 |
EXPORT_SYMBOL_GPL(register_jprobe); |
1da177e4c Linux-2.6.12-rc2 |
1664 |
|
d0aaff979 [PATCH] Kprobes: ... |
1665 |
void __kprobes unregister_jprobe(struct jprobe *jp) |
1da177e4c Linux-2.6.12-rc2 |
1666 |
{ |
26b31c190 kprobes: add (un)... |
1667 1668 |
unregister_jprobes(&jp, 1); } |
99081ab55 kprobes: move EXP... |
1669 |
EXPORT_SYMBOL_GPL(unregister_jprobe); |
26b31c190 kprobes: add (un)... |
1670 |
|
26b31c190 kprobes: add (un)... |
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 |
void __kprobes unregister_jprobes(struct jprobe **jps, int num) { 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 |
1688 |
} |
99081ab55 kprobes: move EXP... |
1689 |
EXPORT_SYMBOL_GPL(unregister_jprobes); |
1da177e4c Linux-2.6.12-rc2 |
1690 |
|
9edddaa20 Kprobes: indicate... |
1691 |
#ifdef CONFIG_KRETPROBES |
e65cefe87 [PATCH] kernel/kp... |
1692 1693 1694 1695 1696 1697 1698 1699 |
/* * This kprobe pre_handler is registered with every kretprobe. When probe * hits it will set up the return probe. */ static int __kprobes pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) { struct kretprobe *rp = container_of(p, struct kretprobe, kp); |
ef53d9c5e kprobes: improve ... |
1700 1701 |
unsigned long hash, flags = 0; struct kretprobe_instance *ri; |
e65cefe87 [PATCH] kernel/kp... |
1702 1703 |
/*TODO: consider to only swap the RA after the last pre_handler fired */ |
ef53d9c5e kprobes: improve ... |
1704 |
hash = hash_ptr(current, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1705 |
raw_spin_lock_irqsave(&rp->lock, flags); |
4c4308cb9 kprobes: kretprob... |
1706 |
if (!hlist_empty(&rp->free_instances)) { |
4c4308cb9 kprobes: kretprob... |
1707 |
ri = hlist_entry(rp->free_instances.first, |
ef53d9c5e kprobes: improve ... |
1708 1709 |
struct kretprobe_instance, hlist); hlist_del(&ri->hlist); |
ec484608c locking, kprobes:... |
1710 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1711 |
|
4c4308cb9 kprobes: kretprob... |
1712 1713 |
ri->rp = rp; ri->task = current; |
f47cd9b55 kprobes: kretprob... |
1714 |
|
55ca6140e kprobes: fix a me... |
1715 1716 1717 1718 |
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... |
1719 |
return 0; |
55ca6140e kprobes: fix a me... |
1720 |
} |
f47cd9b55 kprobes: kretprob... |
1721 |
|
4c4308cb9 kprobes: kretprob... |
1722 1723 1724 |
arch_prepare_kretprobe(ri, regs); /* XXX(hch): why is there no hlist_move_head? */ |
ef53d9c5e kprobes: improve ... |
1725 1726 1727 1728 1729 |
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... |
1730 |
rp->nmissed++; |
ec484608c locking, kprobes:... |
1731 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1732 |
} |
e65cefe87 [PATCH] kernel/kp... |
1733 1734 |
return 0; } |
49ad2fd76 kprobes: remove c... |
1735 |
int __kprobes register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1736 1737 1738 1739 |
{ int ret = 0; struct kretprobe_instance *inst; int i; |
b2a5cd693 kprobes: fix a nu... |
1740 |
void *addr; |
f438d914b kprobes: support ... |
1741 1742 |
if (kretprobe_blacklist_size) { |
b2a5cd693 kprobes: fix a nu... |
1743 |
addr = kprobe_addr(&rp->kp); |
bc81d48d1 kprobes: Return -... |
1744 1745 |
if (IS_ERR(addr)) return PTR_ERR(addr); |
f438d914b kprobes: support ... |
1746 1747 1748 1749 1750 1751 |
for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { if (kretprobe_blacklist[i].addr == addr) return -EINVAL; } } |
b94cce926 [PATCH] kprobes: ... |
1752 1753 |
rp->kp.pre_handler = pre_handler_kretprobe; |
7522a8423 [PATCH] kprobes: ... |
1754 1755 1756 |
rp->kp.post_handler = NULL; rp->kp.fault_handler = NULL; rp->kp.break_handler = NULL; |
b94cce926 [PATCH] kprobes: ... |
1757 1758 1759 1760 |
/* Pre-allocate memory for max kretprobe instances */ if (rp->maxactive <= 0) { #ifdef CONFIG_PREEMPT |
c2ef6661c kprobes: Fix dist... |
1761 |
rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus()); |
b94cce926 [PATCH] kprobes: ... |
1762 |
#else |
4dae560f9 kprobes: Sanitize... |
1763 |
rp->maxactive = num_possible_cpus(); |
b94cce926 [PATCH] kprobes: ... |
1764 1765 |
#endif } |
ec484608c locking, kprobes:... |
1766 |
raw_spin_lock_init(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1767 1768 |
INIT_HLIST_HEAD(&rp->free_instances); for (i = 0; i < rp->maxactive; i++) { |
f47cd9b55 kprobes: kretprob... |
1769 1770 |
inst = kmalloc(sizeof(struct kretprobe_instance) + rp->data_size, GFP_KERNEL); |
b94cce926 [PATCH] kprobes: ... |
1771 1772 1773 1774 |
if (inst == NULL) { free_rp_inst(rp); return -ENOMEM; } |
ef53d9c5e kprobes: improve ... |
1775 1776 |
INIT_HLIST_NODE(&inst->hlist); hlist_add_head(&inst->hlist, &rp->free_instances); |
b94cce926 [PATCH] kprobes: ... |
1777 1778 1779 1780 |
} rp->nmissed = 0; /* Establish function entry probe point */ |
49ad2fd76 kprobes: remove c... |
1781 |
ret = register_kprobe(&rp->kp); |
4a296e07c kprobes: add (un)... |
1782 |
if (ret != 0) |
b94cce926 [PATCH] kprobes: ... |
1783 1784 1785 |
free_rp_inst(rp); return ret; } |
99081ab55 kprobes: move EXP... |
1786 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1787 |
|
49ad2fd76 kprobes: remove c... |
1788 |
int __kprobes register_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1789 1790 1791 1792 1793 1794 |
{ int ret = 0, i; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1795 |
ret = register_kretprobe(rps[i]); |
67dddaad5 kprobes: fix erro... |
1796 1797 1798 |
if (ret < 0) { if (i > 0) unregister_kretprobes(rps, i); |
4a296e07c kprobes: add (un)... |
1799 1800 1801 1802 1803 |
break; } } return ret; } |
99081ab55 kprobes: move EXP... |
1804 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
4a296e07c kprobes: add (un)... |
1805 |
|
4a296e07c kprobes: add (un)... |
1806 1807 1808 1809 |
void __kprobes unregister_kretprobe(struct kretprobe *rp) { unregister_kretprobes(&rp, 1); } |
99081ab55 kprobes: move EXP... |
1810 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
4a296e07c kprobes: add (un)... |
1811 |
|
4a296e07c kprobes: add (un)... |
1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 |
void __kprobes unregister_kretprobes(struct kretprobe **rps, int num) { 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... |
1832 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4a296e07c kprobes: add (un)... |
1833 |
|
9edddaa20 Kprobes: indicate... |
1834 |
#else /* CONFIG_KRETPROBES */ |
d0aaff979 [PATCH] Kprobes: ... |
1835 |
int __kprobes register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1836 1837 1838 |
{ return -ENOSYS; } |
99081ab55 kprobes: move EXP... |
1839 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1840 |
|
4a296e07c kprobes: add (un)... |
1841 |
int __kprobes register_kretprobes(struct kretprobe **rps, int num) |
346fd59ba [PATCH] kprobes: ... |
1842 |
{ |
4a296e07c kprobes: add (un)... |
1843 |
return -ENOSYS; |
346fd59ba [PATCH] kprobes: ... |
1844 |
} |
99081ab55 kprobes: move EXP... |
1845 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
d0aaff979 [PATCH] Kprobes: ... |
1846 |
void __kprobes unregister_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1847 |
{ |
4a296e07c kprobes: add (un)... |
1848 |
} |
99081ab55 kprobes: move EXP... |
1849 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1850 |
|
4a296e07c kprobes: add (un)... |
1851 1852 1853 |
void __kprobes unregister_kretprobes(struct kretprobe **rps, int num) { } |
99081ab55 kprobes: move EXP... |
1854 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4c4308cb9 kprobes: kretprob... |
1855 |
|
4a296e07c kprobes: add (un)... |
1856 1857 1858 1859 |
static int __kprobes pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) { return 0; |
b94cce926 [PATCH] kprobes: ... |
1860 |
} |
4a296e07c kprobes: add (un)... |
1861 |
#endif /* CONFIG_KRETPROBES */ |
e8386a0cb kprobes: support ... |
1862 1863 1864 1865 |
/* Set the kprobe gone and remove its instruction buffer. */ static void __kprobes kill_kprobe(struct kprobe *p) { struct kprobe *kp; |
de5bd88d5 kprobes: support ... |
1866 |
|
e8386a0cb kprobes: support ... |
1867 |
p->flags |= KPROBE_FLAG_GONE; |
afd66255b kprobes: Introduc... |
1868 |
if (kprobe_aggrprobe(p)) { |
e8386a0cb kprobes: support ... |
1869 1870 1871 1872 1873 1874 1875 1876 |
/* * 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... |
1877 |
kill_optimized_kprobe(p); |
e8386a0cb kprobes: support ... |
1878 1879 1880 1881 1882 1883 1884 |
} /* * 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... |
1885 1886 1887 1888 |
/* Disable one kprobe */ int __kprobes disable_kprobe(struct kprobe *kp) { int ret = 0; |
c0614829c kprobes: Move ena... |
1889 1890 |
mutex_lock(&kprobe_mutex); |
6f0f1dd71 kprobes: Cleanup ... |
1891 1892 |
/* Disable this kprobe */ if (__disable_kprobe(kp) == NULL) |
c0614829c kprobes: Move ena... |
1893 |
ret = -EINVAL; |
c0614829c kprobes: Move ena... |
1894 |
|
c0614829c kprobes: Move ena... |
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 |
mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(disable_kprobe); /* Enable one kprobe */ int __kprobes enable_kprobe(struct kprobe *kp) { 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); |
24851d244 tracing/kprobes: ... |
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 |
void __kprobes dump_kprobe(struct kprobe *kp) { printk(KERN_WARNING "Dumping kprobe: "); printk(KERN_WARNING "Name: %s Address: %p Offset: %x ", kp->symbol_name, kp->addr, kp->offset); } |
e8386a0cb kprobes: support ... |
1943 1944 1945 1946 1947 1948 |
/* Module notifier call back, checking kprobes on the module */ static int __kprobes kprobes_module_callback(struct notifier_block *nb, unsigned long val, void *data) { struct module *mod = data; struct hlist_head *head; |
e8386a0cb kprobes: support ... |
1949 1950 |
struct kprobe *p; unsigned int i; |
f24659d96 kprobes: support ... |
1951 |
int checkcore = (val == MODULE_STATE_GOING); |
e8386a0cb kprobes: support ... |
1952 |
|
f24659d96 kprobes: support ... |
1953 |
if (val != MODULE_STATE_GOING && val != MODULE_STATE_LIVE) |
e8386a0cb kprobes: support ... |
1954 1955 1956 |
return NOTIFY_DONE; /* |
f24659d96 kprobes: support ... |
1957 1958 1959 1960 |
* 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 ... |
1961 1962 1963 1964 |
*/ mutex_lock(&kprobe_mutex); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
1965 |
hlist_for_each_entry_rcu(p, head, hlist) |
f24659d96 kprobes: support ... |
1966 1967 1968 |
if (within_module_init((unsigned long)p->addr, mod) || (checkcore && within_module_core((unsigned long)p->addr, mod))) { |
e8386a0cb kprobes: support ... |
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 |
/* * The vaddr this probe is installed will soon * be vfreed buy not synced to disk. Hence, * disarming the breakpoint isn't needed. */ kill_kprobe(p); } } mutex_unlock(&kprobe_mutex); return NOTIFY_DONE; } static struct notifier_block kprobe_module_nb = { .notifier_call = kprobes_module_callback, .priority = 0 }; |
1da177e4c Linux-2.6.12-rc2 |
1985 1986 1987 |
static int __init init_kprobes(void) { int i, err = 0; |
3d8d996e0 kprobes: prevent ... |
1988 1989 1990 1991 1992 |
unsigned long offset = 0, size = 0; char *modname, namebuf[128]; const char *symbol_name; void *addr; struct kprobe_blackpoint *kb; |
1da177e4c Linux-2.6.12-rc2 |
1993 1994 1995 |
/* FIXME allocate the probe table, currently defined statically */ /* initialize all list heads */ |
b94cce926 [PATCH] kprobes: ... |
1996 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { |
1da177e4c Linux-2.6.12-rc2 |
1997 |
INIT_HLIST_HEAD(&kprobe_table[i]); |
b94cce926 [PATCH] kprobes: ... |
1998 |
INIT_HLIST_HEAD(&kretprobe_inst_table[i]); |
ec484608c locking, kprobes:... |
1999 |
raw_spin_lock_init(&(kretprobe_table_locks[i].lock)); |
b94cce926 [PATCH] kprobes: ... |
2000 |
} |
1da177e4c Linux-2.6.12-rc2 |
2001 |
|
3d8d996e0 kprobes: prevent ... |
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 |
/* * 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. */ for (kb = kprobe_blacklist; kb->name != NULL; kb++) { kprobe_lookup_name(kb->name, addr); if (!addr) continue; kb->start_addr = (unsigned long)addr; symbol_name = kallsyms_lookup(kb->start_addr, &size, &offset, &modname, namebuf); if (!symbol_name) kb->range = 0; else kb->range = size; } |
f438d914b kprobes: support ... |
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 |
if (kretprobe_blacklist_size) { /* lookup the function address from its name */ for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { kprobe_lookup_name(kretprobe_blacklist[i].name, kretprobe_blacklist[i].addr); if (!kretprobe_blacklist[i].addr) printk("kretprobe: lookup failed: %s ", kretprobe_blacklist[i].name); } } |
b2be84df9 kprobes: Jump opt... |
2034 2035 |
#if defined(CONFIG_OPTPROBES) #if defined(__ARCH_WANT_KPROBES_INSN_SLOT) |
afd66255b kprobes: Introduc... |
2036 2037 2038 |
/* Init kprobe_optinsn_slots */ kprobe_optinsn_slots.insn_size = MAX_OPTINSN_SIZE; #endif |
b2be84df9 kprobes: Jump opt... |
2039 2040 2041 |
/* By default, kprobes can be optimized */ kprobes_allow_optimization = true; #endif |
afd66255b kprobes: Introduc... |
2042 |
|
e579abeb5 kprobes: rename k... |
2043 2044 |
/* By default, kprobes are armed */ kprobes_all_disarmed = false; |
bf8f6e5b3 Kprobes: The ON/O... |
2045 |
|
6772926be [PATCH] kprobes: ... |
2046 |
err = arch_init_kprobes(); |
802eae7c8 [PATCH] Return pr... |
2047 2048 |
if (!err) err = register_die_notifier(&kprobe_exceptions_nb); |
e8386a0cb kprobes: support ... |
2049 2050 |
if (!err) err = register_module_notifier(&kprobe_module_nb); |
ef53d9c5e kprobes: improve ... |
2051 |
kprobes_initialized = (err == 0); |
802eae7c8 [PATCH] Return pr... |
2052 |
|
8c1c93564 x86: kprobes: add... |
2053 2054 |
if (!err) init_test_probes(); |
1da177e4c Linux-2.6.12-rc2 |
2055 2056 |
return err; } |
346fd59ba [PATCH] kprobes: ... |
2057 2058 |
#ifdef CONFIG_DEBUG_FS static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p, |
afd66255b kprobes: Introduc... |
2059 |
const char *sym, int offset, char *modname, struct kprobe *pp) |
346fd59ba [PATCH] kprobes: ... |
2060 2061 2062 2063 2064 2065 2066 2067 2068 |
{ 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... |
2069 |
|
346fd59ba [PATCH] kprobes: ... |
2070 |
if (sym) |
afd66255b kprobes: Introduc... |
2071 |
seq_printf(pi, "%p %s %s+0x%x %s ", |
de5bd88d5 kprobes: support ... |
2072 |
p->addr, kprobe_type, sym, offset, |
afd66255b kprobes: Introduc... |
2073 |
(modname ? modname : " ")); |
346fd59ba [PATCH] kprobes: ... |
2074 |
else |
afd66255b kprobes: Introduc... |
2075 2076 2077 2078 2079 |
seq_printf(pi, "%p %s %p ", p->addr, kprobe_type, p->addr); if (!pp) pp = p; |
ae6aa16fd kprobes: introduc... |
2080 2081 |
seq_printf(pi, "%s%s%s%s ", |
afd66255b kprobes: Introduc... |
2082 2083 |
(kprobe_gone(p) ? "[GONE]" : ""), ((kprobe_disabled(p) && !kprobe_gone(p)) ? "[DISABLED]" : ""), |
ae6aa16fd kprobes: introduc... |
2084 2085 |
(kprobe_optimized(pp) ? "[OPTIMIZED]" : ""), (kprobe_ftrace(pp) ? "[FTRACE]" : "")); |
346fd59ba [PATCH] kprobes: ... |
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 |
} static void __kprobes *kprobe_seq_start(struct seq_file *f, loff_t *pos) { return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL; } static void __kprobes *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos) { (*pos)++; if (*pos >= KPROBE_TABLE_SIZE) return NULL; return pos; } static void __kprobes kprobe_seq_stop(struct seq_file *f, void *v) { /* Nothing to do */ } static int __kprobes show_kprobe_addr(struct seq_file *pi, void *v) { struct hlist_head *head; |
346fd59ba [PATCH] kprobes: ... |
2109 2110 2111 |
struct kprobe *p, *kp; const char *sym = NULL; unsigned int i = *(loff_t *) v; |
ffb451227 Simplify kallsyms... |
2112 |
unsigned long offset = 0; |
346fd59ba [PATCH] kprobes: ... |
2113 2114 2115 2116 |
char *modname, namebuf[128]; head = &kprobe_table[i]; preempt_disable(); |
b67bfe0d4 hlist: drop the n... |
2117 |
hlist_for_each_entry_rcu(p, head, hlist) { |
ffb451227 Simplify kallsyms... |
2118 |
sym = kallsyms_lookup((unsigned long)p->addr, NULL, |
346fd59ba [PATCH] kprobes: ... |
2119 |
&offset, &modname, namebuf); |
afd66255b kprobes: Introduc... |
2120 |
if (kprobe_aggrprobe(p)) { |
346fd59ba [PATCH] kprobes: ... |
2121 |
list_for_each_entry_rcu(kp, &p->list, list) |
afd66255b kprobes: Introduc... |
2122 |
report_probe(pi, kp, sym, offset, modname, p); |
346fd59ba [PATCH] kprobes: ... |
2123 |
} else |
afd66255b kprobes: Introduc... |
2124 |
report_probe(pi, p, sym, offset, modname, NULL); |
346fd59ba [PATCH] kprobes: ... |
2125 2126 2127 2128 |
} preempt_enable(); return 0; } |
88e9d34c7 seq_file: constif... |
2129 |
static const struct seq_operations kprobes_seq_ops = { |
346fd59ba [PATCH] kprobes: ... |
2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 |
.start = kprobe_seq_start, .next = kprobe_seq_next, .stop = kprobe_seq_stop, .show = show_kprobe_addr }; static int __kprobes kprobes_open(struct inode *inode, struct file *filp) { return seq_open(filp, &kprobes_seq_ops); } |
828c09509 const: constify r... |
2140 |
static const struct file_operations debugfs_kprobes_operations = { |
346fd59ba [PATCH] kprobes: ... |
2141 2142 2143 2144 2145 |
.open = kprobes_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
e579abeb5 kprobes: rename k... |
2146 |
static void __kprobes arm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2147 2148 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2149 2150 2151 2152 |
struct kprobe *p; unsigned int i; mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2153 2154 |
/* If kprobes are armed, just return */ if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2155 |
goto already_enabled; |
afd66255b kprobes: Introduc... |
2156 |
/* Arming kprobes doesn't optimize kprobe itself */ |
bf8f6e5b3 Kprobes: The ON/O... |
2157 2158 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2159 |
hlist_for_each_entry_rcu(p, head, hlist) |
de5bd88d5 kprobes: support ... |
2160 |
if (!kprobe_disabled(p)) |
ae6aa16fd kprobes: introduc... |
2161 |
arm_kprobe(p); |
bf8f6e5b3 Kprobes: The ON/O... |
2162 |
} |
e579abeb5 kprobes: rename k... |
2163 |
kprobes_all_disarmed = false; |
bf8f6e5b3 Kprobes: The ON/O... |
2164 2165 2166 2167 2168 2169 2170 |
printk(KERN_INFO "Kprobes globally enabled "); already_enabled: mutex_unlock(&kprobe_mutex); return; } |
e579abeb5 kprobes: rename k... |
2171 |
static void __kprobes disarm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2172 2173 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2174 2175 2176 2177 |
struct kprobe *p; unsigned int i; mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2178 |
/* If kprobes are already disarmed, just return */ |
6274de498 kprobes: Support ... |
2179 2180 2181 2182 |
if (kprobes_all_disarmed) { mutex_unlock(&kprobe_mutex); return; } |
bf8f6e5b3 Kprobes: The ON/O... |
2183 |
|
e579abeb5 kprobes: rename k... |
2184 |
kprobes_all_disarmed = true; |
bf8f6e5b3 Kprobes: The ON/O... |
2185 2186 |
printk(KERN_INFO "Kprobes globally disabled "); |
afd66255b kprobes: Introduc... |
2187 |
|
bf8f6e5b3 Kprobes: The ON/O... |
2188 2189 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2190 |
hlist_for_each_entry_rcu(p, head, hlist) { |
de5bd88d5 kprobes: support ... |
2191 |
if (!arch_trampoline_kprobe(p) && !kprobe_disabled(p)) |
ae6aa16fd kprobes: introduc... |
2192 |
disarm_kprobe(p, false); |
bf8f6e5b3 Kprobes: The ON/O... |
2193 2194 |
} } |
bf8f6e5b3 Kprobes: The ON/O... |
2195 |
mutex_unlock(&kprobe_mutex); |
bf8f6e5b3 Kprobes: The ON/O... |
2196 |
|
6274de498 kprobes: Support ... |
2197 2198 |
/* Wait for disarming all kprobes by optimizer */ wait_for_kprobe_optimizer(); |
bf8f6e5b3 Kprobes: The ON/O... |
2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 |
} /* * 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... |
2210 |
if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 |
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 ... |
2224 |
size_t buf_size; |
bf8f6e5b3 Kprobes: The ON/O... |
2225 2226 2227 2228 |
buf_size = min(count, (sizeof(buf)-1)); if (copy_from_user(buf, user_buf, buf_size)) return -EFAULT; |
10fb46d5f kprobes: handle e... |
2229 |
buf[buf_size] = '\0'; |
bf8f6e5b3 Kprobes: The ON/O... |
2230 2231 2232 2233 |
switch (buf[0]) { case 'y': case 'Y': case '1': |
e579abeb5 kprobes: rename k... |
2234 |
arm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2235 2236 2237 2238 |
break; case 'n': case 'N': case '0': |
e579abeb5 kprobes: rename k... |
2239 |
disarm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2240 |
break; |
10fb46d5f kprobes: handle e... |
2241 2242 |
default: return -EINVAL; |
bf8f6e5b3 Kprobes: The ON/O... |
2243 2244 2245 2246 |
} return count; } |
828c09509 const: constify r... |
2247 |
static const struct file_operations fops_kp = { |
bf8f6e5b3 Kprobes: The ON/O... |
2248 2249 |
.read = read_enabled_file_bool, .write = write_enabled_file_bool, |
6038f373a llseek: automatic... |
2250 |
.llseek = default_llseek, |
bf8f6e5b3 Kprobes: The ON/O... |
2251 |
}; |
346fd59ba [PATCH] kprobes: ... |
2252 2253 2254 |
static int __kprobes debugfs_kprobe_init(void) { struct dentry *dir, *file; |
bf8f6e5b3 Kprobes: The ON/O... |
2255 |
unsigned int value = 1; |
346fd59ba [PATCH] kprobes: ... |
2256 2257 2258 2259 |
dir = debugfs_create_dir("kprobes", NULL); if (!dir) return -ENOMEM; |
e38697929 kprobes: fix spar... |
2260 |
file = debugfs_create_file("list", 0444, dir, NULL, |
346fd59ba [PATCH] kprobes: ... |
2261 2262 2263 2264 2265 |
&debugfs_kprobes_operations); if (!file) { debugfs_remove(dir); return -ENOMEM; } |
bf8f6e5b3 Kprobes: The ON/O... |
2266 2267 2268 2269 2270 2271 |
file = debugfs_create_file("enabled", 0600, dir, &value, &fops_kp); if (!file) { debugfs_remove(dir); return -ENOMEM; } |
346fd59ba [PATCH] kprobes: ... |
2272 2273 2274 2275 2276 2277 2278 |
return 0; } late_initcall(debugfs_kprobe_init); #endif /* CONFIG_DEBUG_FS */ module_init(init_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
2279 |
|
99081ab55 kprobes: move EXP... |
2280 |
/* defined in arch/.../kernel/kprobes.c */ |
1da177e4c Linux-2.6.12-rc2 |
2281 |
EXPORT_SYMBOL_GPL(jprobe_return); |