Blame view
kernel/kprobes.c
63.4 KB
1a59d1b8e treewide: Replace... |
1 |
// SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4c Linux-2.6.12-rc2 |
2 3 4 5 |
/* * Kernel Probes (KProbes) * kernel/kprobes.c * |
1da177e4c Linux-2.6.12-rc2 |
6 7 8 9 10 11 12 13 14 15 16 |
* 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. |
b94cce926 [PATCH] kprobes: ... |
17 18 19 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
20 21 |
*/ #include <linux/kprobes.h> |
1da177e4c Linux-2.6.12-rc2 |
22 23 |
#include <linux/hash.h> #include <linux/init.h> |
4e57b6817 [PATCH] fix missi... |
24 |
#include <linux/slab.h> |
e38697929 kprobes: fix spar... |
25 |
#include <linux/stddef.h> |
9984de1a5 kernel: Map most ... |
26 |
#include <linux/export.h> |
9ec4b1f35 [PATCH] kprobes: ... |
27 |
#include <linux/moduleloader.h> |
3a872d89b [PATCH] Kprobes: ... |
28 |
#include <linux/kallsyms.h> |
b4c6c34a5 [PATCH] kprobes: ... |
29 |
#include <linux/freezer.h> |
346fd59ba [PATCH] kprobes: ... |
30 31 |
#include <linux/seq_file.h> #include <linux/debugfs.h> |
b2be84df9 kprobes: Jump opt... |
32 |
#include <linux/sysctl.h> |
1eeb66a1b move die notifier... |
33 |
#include <linux/kdebug.h> |
4460fdad8 tracing, Text Edi... |
34 |
#include <linux/memory.h> |
4554dbcb8 kprobes: Check pr... |
35 |
#include <linux/ftrace.h> |
afd66255b kprobes: Introduc... |
36 |
#include <linux/cpu.h> |
bf5438fca jump label: Base ... |
37 |
#include <linux/jump_label.h> |
bf8f6e5b3 Kprobes: The ON/O... |
38 |
|
bfd45be0b kprobes: include ... |
39 |
#include <asm/sections.h> |
1da177e4c Linux-2.6.12-rc2 |
40 41 |
#include <asm/cacheflush.h> #include <asm/errno.h> |
7c0f6ba68 Replace <asm/uacc... |
42 |
#include <linux/uaccess.h> |
1da177e4c Linux-2.6.12-rc2 |
43 44 45 |
#define KPROBE_HASH_BITS 6 #define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS) |
3a872d89b [PATCH] Kprobes: ... |
46 |
|
ef53d9c5e kprobes: improve ... |
47 |
static int kprobes_initialized; |
1da177e4c Linux-2.6.12-rc2 |
48 |
static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE]; |
b94cce926 [PATCH] kprobes: ... |
49 |
static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE]; |
1da177e4c Linux-2.6.12-rc2 |
50 |
|
bf8f6e5b3 Kprobes: The ON/O... |
51 |
/* NOTE: change this value only with kprobe_mutex held */ |
e579abeb5 kprobes: rename k... |
52 |
static bool kprobes_all_disarmed; |
bf8f6e5b3 Kprobes: The ON/O... |
53 |
|
43948f502 kprobes: Remove r... |
54 55 |
/* This protects kprobe_table and optimizing_list */ static DEFINE_MUTEX(kprobe_mutex); |
e65845235 [PATCH] Kprobes: ... |
56 |
static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL; |
ef53d9c5e kprobes: improve ... |
57 |
static struct { |
ec484608c locking, kprobes:... |
58 |
raw_spinlock_t lock ____cacheline_aligned_in_smp; |
ef53d9c5e kprobes: improve ... |
59 |
} kretprobe_table_locks[KPROBE_TABLE_SIZE]; |
290e30707 powerpc/kprobes: ... |
60 61 |
kprobe_opcode_t * __weak kprobe_lookup_name(const char *name, unsigned int __unused) |
49e0b4658 kprobes: Convert ... |
62 63 64 |
{ return ((kprobe_opcode_t *)(kallsyms_lookup_name(name))); } |
ec484608c locking, kprobes:... |
65 |
static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash) |
ef53d9c5e kprobes: improve ... |
66 67 68 |
{ return &(kretprobe_table_locks[hash].lock); } |
1da177e4c Linux-2.6.12-rc2 |
69 |
|
376e24242 kprobes: Introduc... |
70 71 |
/* Blacklist -- list of struct kprobe_blacklist_entry */ static LIST_HEAD(kprobe_blacklist); |
3d8d996e0 kprobes: prevent ... |
72 |
|
2d14e39da [PATCH] kprobes: ... |
73 |
#ifdef __ARCH_WANT_KPROBES_INSN_SLOT |
9ec4b1f35 [PATCH] kprobes: ... |
74 75 76 77 78 79 |
/* * 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 */ |
9ec4b1f35 [PATCH] kprobes: ... |
80 |
struct kprobe_insn_page { |
c5cb5a2d8 kprobes: Clean up... |
81 |
struct list_head list; |
9ec4b1f35 [PATCH] kprobes: ... |
82 |
kprobe_opcode_t *insns; /* Page of instruction slots */ |
af96397de kprobes: allow to... |
83 |
struct kprobe_insn_cache *cache; |
9ec4b1f35 [PATCH] kprobes: ... |
84 |
int nused; |
b4c6c34a5 [PATCH] kprobes: ... |
85 |
int ngarbage; |
4610ee1d3 kprobes: Introduc... |
86 |
char slot_used[]; |
9ec4b1f35 [PATCH] kprobes: ... |
87 |
}; |
4610ee1d3 kprobes: Introduc... |
88 89 90 |
#define KPROBE_INSN_PAGE_SIZE(slots) \ (offsetof(struct kprobe_insn_page, slot_used) + \ (sizeof(char) * (slots))) |
4610ee1d3 kprobes: Introduc... |
91 92 93 94 |
static int slots_per_page(struct kprobe_insn_cache *c) { return PAGE_SIZE/(c->insn_size * sizeof(kprobe_opcode_t)); } |
ab40c5c6b [PATCH] kprobes: ... |
95 96 97 98 99 |
enum kprobe_slot_state { SLOT_CLEAN = 0, SLOT_DIRTY = 1, SLOT_USED = 2, }; |
63fef14fc kprobes/x86: Make... |
100 |
void __weak *alloc_insn_page(void) |
af96397de kprobes: allow to... |
101 102 103 |
{ return module_alloc(PAGE_SIZE); } |
c93f5cf57 kprobes/x86: Fix ... |
104 |
void __weak free_insn_page(void *page) |
af96397de kprobes: allow to... |
105 |
{ |
be1f221c0 module: remove mo... |
106 |
module_memfree(page); |
af96397de kprobes: allow to... |
107 |
} |
c802d64a3 kprobes: unify in... |
108 109 |
struct kprobe_insn_cache kprobe_insn_slots = { .mutex = __MUTEX_INITIALIZER(kprobe_insn_slots.mutex), |
af96397de kprobes: allow to... |
110 111 |
.alloc = alloc_insn_page, .free = free_insn_page, |
4610ee1d3 kprobes: Introduc... |
112 113 114 115 |
.pages = LIST_HEAD_INIT(kprobe_insn_slots.pages), .insn_size = MAX_INSN_SIZE, .nr_garbage = 0, }; |
55479f647 kprobes: Allow pr... |
116 |
static int collect_garbage_slots(struct kprobe_insn_cache *c); |
b4c6c34a5 [PATCH] kprobes: ... |
117 |
|
9ec4b1f35 [PATCH] kprobes: ... |
118 |
/** |
129415607 kprobes: add kpro... |
119 |
* __get_insn_slot() - Find a slot on an executable page for an instruction. |
9ec4b1f35 [PATCH] kprobes: ... |
120 121 |
* We allocate an executable page if there's no room on existing ones. */ |
55479f647 kprobes: Allow pr... |
122 |
kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c) |
9ec4b1f35 [PATCH] kprobes: ... |
123 124 |
{ struct kprobe_insn_page *kip; |
c802d64a3 kprobes: unify in... |
125 |
kprobe_opcode_t *slot = NULL; |
9ec4b1f35 [PATCH] kprobes: ... |
126 |
|
5b485629b kprobes, extable:... |
127 |
/* Since the slot array is not protected by rcu, we need a mutex */ |
c802d64a3 kprobes: unify in... |
128 |
mutex_lock(&c->mutex); |
6f716acd5 kprobes: codingst... |
129 |
retry: |
5b485629b kprobes, extable:... |
130 131 |
rcu_read_lock(); list_for_each_entry_rcu(kip, &c->pages, list) { |
4610ee1d3 kprobes: Introduc... |
132 |
if (kip->nused < slots_per_page(c)) { |
9ec4b1f35 [PATCH] kprobes: ... |
133 |
int i; |
4610ee1d3 kprobes: Introduc... |
134 |
for (i = 0; i < slots_per_page(c); i++) { |
ab40c5c6b [PATCH] kprobes: ... |
135 136 |
if (kip->slot_used[i] == SLOT_CLEAN) { kip->slot_used[i] = SLOT_USED; |
9ec4b1f35 [PATCH] kprobes: ... |
137 |
kip->nused++; |
c802d64a3 kprobes: unify in... |
138 |
slot = kip->insns + (i * c->insn_size); |
5b485629b kprobes, extable:... |
139 |
rcu_read_unlock(); |
c802d64a3 kprobes: unify in... |
140 |
goto out; |
9ec4b1f35 [PATCH] kprobes: ... |
141 142 |
} } |
4610ee1d3 kprobes: Introduc... |
143 144 145 |
/* kip->nused is broken. Fix it. */ kip->nused = slots_per_page(c); WARN_ON(1); |
9ec4b1f35 [PATCH] kprobes: ... |
146 147 |
} } |
5b485629b kprobes, extable:... |
148 |
rcu_read_unlock(); |
9ec4b1f35 [PATCH] kprobes: ... |
149 |
|
b4c6c34a5 [PATCH] kprobes: ... |
150 |
/* If there are any garbage slots, collect it and try again. */ |
4610ee1d3 kprobes: Introduc... |
151 |
if (c->nr_garbage && collect_garbage_slots(c) == 0) |
b4c6c34a5 [PATCH] kprobes: ... |
152 |
goto retry; |
4610ee1d3 kprobes: Introduc... |
153 154 155 |
/* All out of space. Need to allocate a new page. */ kip = kmalloc(KPROBE_INSN_PAGE_SIZE(slots_per_page(c)), GFP_KERNEL); |
6f716acd5 kprobes: codingst... |
156 |
if (!kip) |
c802d64a3 kprobes: unify in... |
157 |
goto out; |
9ec4b1f35 [PATCH] kprobes: ... |
158 159 160 161 162 163 |
/* * 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. */ |
af96397de kprobes: allow to... |
164 |
kip->insns = c->alloc(); |
9ec4b1f35 [PATCH] kprobes: ... |
165 166 |
if (!kip->insns) { kfree(kip); |
c802d64a3 kprobes: unify in... |
167 |
goto out; |
9ec4b1f35 [PATCH] kprobes: ... |
168 |
} |
c5cb5a2d8 kprobes: Clean up... |
169 |
INIT_LIST_HEAD(&kip->list); |
4610ee1d3 kprobes: Introduc... |
170 |
memset(kip->slot_used, SLOT_CLEAN, slots_per_page(c)); |
ab40c5c6b [PATCH] kprobes: ... |
171 |
kip->slot_used[0] = SLOT_USED; |
9ec4b1f35 [PATCH] kprobes: ... |
172 |
kip->nused = 1; |
b4c6c34a5 [PATCH] kprobes: ... |
173 |
kip->ngarbage = 0; |
af96397de kprobes: allow to... |
174 |
kip->cache = c; |
5b485629b kprobes, extable:... |
175 |
list_add_rcu(&kip->list, &c->pages); |
c802d64a3 kprobes: unify in... |
176 177 178 179 |
slot = kip->insns; out: mutex_unlock(&c->mutex); return slot; |
129415607 kprobes: add kpro... |
180 |
} |
b4c6c34a5 [PATCH] kprobes: ... |
181 |
/* Return 1 if all garbages are collected, otherwise 0. */ |
55479f647 kprobes: Allow pr... |
182 |
static int collect_one_slot(struct kprobe_insn_page *kip, int idx) |
b4c6c34a5 [PATCH] kprobes: ... |
183 |
{ |
ab40c5c6b [PATCH] kprobes: ... |
184 |
kip->slot_used[idx] = SLOT_CLEAN; |
b4c6c34a5 [PATCH] kprobes: ... |
185 186 187 188 189 190 191 192 |
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. */ |
4610ee1d3 kprobes: Introduc... |
193 |
if (!list_is_singular(&kip->list)) { |
5b485629b kprobes, extable:... |
194 195 |
list_del_rcu(&kip->list); synchronize_rcu(); |
af96397de kprobes: allow to... |
196 |
kip->cache->free(kip->insns); |
b4c6c34a5 [PATCH] kprobes: ... |
197 198 199 200 201 202 |
kfree(kip); } return 1; } return 0; } |
55479f647 kprobes: Allow pr... |
203 |
static int collect_garbage_slots(struct kprobe_insn_cache *c) |
b4c6c34a5 [PATCH] kprobes: ... |
204 |
{ |
c5cb5a2d8 kprobes: Clean up... |
205 |
struct kprobe_insn_page *kip, *next; |
b4c6c34a5 [PATCH] kprobes: ... |
206 |
|
615d0ebbc kprobes: Disable ... |
207 |
/* Ensure no-one is interrupted on the garbages */ |
ae8b7ce76 kprobes: Replace ... |
208 |
synchronize_rcu(); |
b4c6c34a5 [PATCH] kprobes: ... |
209 |
|
4610ee1d3 kprobes: Introduc... |
210 |
list_for_each_entry_safe(kip, next, &c->pages, list) { |
b4c6c34a5 [PATCH] kprobes: ... |
211 |
int i; |
b4c6c34a5 [PATCH] kprobes: ... |
212 213 214 |
if (kip->ngarbage == 0) continue; kip->ngarbage = 0; /* we will collect all garbages */ |
4610ee1d3 kprobes: Introduc... |
215 |
for (i = 0; i < slots_per_page(c); i++) { |
5b485629b kprobes, extable:... |
216 |
if (kip->slot_used[i] == SLOT_DIRTY && collect_one_slot(kip, i)) |
b4c6c34a5 [PATCH] kprobes: ... |
217 218 219 |
break; } } |
4610ee1d3 kprobes: Introduc... |
220 |
c->nr_garbage = 0; |
b4c6c34a5 [PATCH] kprobes: ... |
221 222 |
return 0; } |
55479f647 kprobes: Allow pr... |
223 224 |
void __free_insn_slot(struct kprobe_insn_cache *c, kprobe_opcode_t *slot, int dirty) |
9ec4b1f35 [PATCH] kprobes: ... |
225 226 |
{ struct kprobe_insn_page *kip; |
5b485629b kprobes, extable:... |
227 |
long idx; |
9ec4b1f35 [PATCH] kprobes: ... |
228 |
|
c802d64a3 kprobes: unify in... |
229 |
mutex_lock(&c->mutex); |
5b485629b kprobes, extable:... |
230 231 232 233 234 |
rcu_read_lock(); list_for_each_entry_rcu(kip, &c->pages, list) { idx = ((long)slot - (long)kip->insns) / (c->insn_size * sizeof(kprobe_opcode_t)); if (idx >= 0 && idx < slots_per_page(c)) |
c802d64a3 kprobes: unify in... |
235 |
goto out; |
9ec4b1f35 [PATCH] kprobes: ... |
236 |
} |
5b485629b kprobes, extable:... |
237 |
/* Could not find this slot. */ |
4610ee1d3 kprobes: Introduc... |
238 |
WARN_ON(1); |
5b485629b kprobes, extable:... |
239 |
kip = NULL; |
c802d64a3 kprobes: unify in... |
240 |
out: |
5b485629b kprobes, extable:... |
241 242 243 244 245 246 247 248 249 250 251 252 253 254 |
rcu_read_unlock(); /* Mark and sweep: this may sleep */ if (kip) { /* Check double free */ WARN_ON(kip->slot_used[idx] != SLOT_USED); if (dirty) { kip->slot_used[idx] = SLOT_DIRTY; kip->ngarbage++; if (++c->nr_garbage > slots_per_page(c)) collect_garbage_slots(c); } else { collect_one_slot(kip, idx); } } |
c802d64a3 kprobes: unify in... |
255 |
mutex_unlock(&c->mutex); |
4610ee1d3 kprobes: Introduc... |
256 |
} |
6f716acd5 kprobes: codingst... |
257 |
|
5b485629b kprobes, extable:... |
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 |
/* * Check given address is on the page of kprobe instruction slots. * This will be used for checking whether the address on a stack * is on a text area or not. */ bool __is_insn_slot_addr(struct kprobe_insn_cache *c, unsigned long addr) { struct kprobe_insn_page *kip; bool ret = false; rcu_read_lock(); list_for_each_entry_rcu(kip, &c->pages, list) { if (addr >= (unsigned long)kip->insns && addr < (unsigned long)kip->insns + PAGE_SIZE) { ret = true; break; } } rcu_read_unlock(); return ret; } |
afd66255b kprobes: Introduc... |
280 281 |
#ifdef CONFIG_OPTPROBES /* For optimized_kprobe buffer */ |
c802d64a3 kprobes: unify in... |
282 283 |
struct kprobe_insn_cache kprobe_optinsn_slots = { .mutex = __MUTEX_INITIALIZER(kprobe_optinsn_slots.mutex), |
af96397de kprobes: allow to... |
284 285 |
.alloc = alloc_insn_page, .free = free_insn_page, |
afd66255b kprobes: Introduc... |
286 287 288 289 |
.pages = LIST_HEAD_INIT(kprobe_optinsn_slots.pages), /* .insn_size is initialized later */ .nr_garbage = 0, }; |
afd66255b kprobes: Introduc... |
290 |
#endif |
2d14e39da [PATCH] kprobes: ... |
291 |
#endif |
9ec4b1f35 [PATCH] kprobes: ... |
292 |
|
e65845235 [PATCH] Kprobes: ... |
293 294 295 |
/* We have preemption disabled.. so it is safe to use __ versions */ static inline void set_kprobe_instance(struct kprobe *kp) { |
b76834bc1 kprobes: Use this... |
296 |
__this_cpu_write(kprobe_instance, kp); |
e65845235 [PATCH] Kprobes: ... |
297 298 299 300 |
} static inline void reset_kprobe_instance(void) { |
b76834bc1 kprobes: Use this... |
301 |
__this_cpu_write(kprobe_instance, NULL); |
e65845235 [PATCH] Kprobes: ... |
302 |
} |
3516a4604 [PATCH] Kprobes: ... |
303 304 |
/* * This routine is called either: |
49a2a1b83 [PATCH] kprobes: ... |
305 |
* - under the kprobe_mutex - during kprobe_[un]register() |
3516a4604 [PATCH] Kprobes: ... |
306 |
* OR |
d217d5450 [PATCH] Kprobes: ... |
307 |
* - with preemption disabled - from arch/xxx/kernel/kprobes.c |
3516a4604 [PATCH] Kprobes: ... |
308 |
*/ |
820aede02 kprobes: Use NOKP... |
309 |
struct kprobe *get_kprobe(void *addr) |
1da177e4c Linux-2.6.12-rc2 |
310 311 |
{ struct hlist_head *head; |
3516a4604 [PATCH] Kprobes: ... |
312 |
struct kprobe *p; |
1da177e4c Linux-2.6.12-rc2 |
313 314 |
head = &kprobe_table[hash_ptr(addr, KPROBE_HASH_BITS)]; |
b67bfe0d4 hlist: drop the n... |
315 |
hlist_for_each_entry_rcu(p, head, hlist) { |
1da177e4c Linux-2.6.12-rc2 |
316 317 318 |
if (p->addr == addr) return p; } |
afd66255b kprobes: Introduc... |
319 |
|
1da177e4c Linux-2.6.12-rc2 |
320 321 |
return NULL; } |
820aede02 kprobes: Use NOKP... |
322 |
NOKPROBE_SYMBOL(get_kprobe); |
1da177e4c Linux-2.6.12-rc2 |
323 |
|
820aede02 kprobes: Use NOKP... |
324 |
static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs); |
afd66255b kprobes: Introduc... |
325 326 327 328 329 330 |
/* Return true if the kprobe is an aggregator */ static inline int kprobe_aggrprobe(struct kprobe *p) { return p->pre_handler == aggr_pre_handler; } |
6274de498 kprobes: Support ... |
331 332 333 334 335 336 |
/* 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); } |
afd66255b kprobes: Introduc... |
337 338 339 |
/* * Keep all fields in the kprobe consistent */ |
6d8e40a85 kprobes: Rename o... |
340 |
static inline void copy_kprobe(struct kprobe *ap, struct kprobe *p) |
afd66255b kprobes: Introduc... |
341 |
{ |
6d8e40a85 kprobes: Rename o... |
342 343 |
memcpy(&p->opcode, &ap->opcode, sizeof(kprobe_opcode_t)); memcpy(&p->ainsn, &ap->ainsn, sizeof(struct arch_specific_insn)); |
afd66255b kprobes: Introduc... |
344 345 346 |
} #ifdef CONFIG_OPTPROBES |
b2be84df9 kprobes: Jump opt... |
347 348 |
/* NOTE: change this value only with kprobe_mutex held */ static bool kprobes_allow_optimization; |
afd66255b kprobes: Introduc... |
349 350 351 352 |
/* * Call all pre_handler on the list, but ignores its return value. * This must be called from arch-dep optimized caller. */ |
820aede02 kprobes: Use NOKP... |
353 |
void opt_pre_handler(struct kprobe *p, struct pt_regs *regs) |
afd66255b kprobes: Introduc... |
354 355 356 357 358 359 |
{ struct kprobe *kp; list_for_each_entry_rcu(kp, &p->list, list) { if (kp->pre_handler && likely(!kprobe_disabled(kp))) { set_kprobe_instance(kp); |
4f3a87144 Revert "kprobes: ... |
360 |
kp->pre_handler(kp, regs); |
afd66255b kprobes: Introduc... |
361 362 363 364 |
} reset_kprobe_instance(); } } |
820aede02 kprobes: Use NOKP... |
365 |
NOKPROBE_SYMBOL(opt_pre_handler); |
afd66255b kprobes: Introduc... |
366 |
|
6274de498 kprobes: Support ... |
367 |
/* Free optimized instructions and optimized_kprobe */ |
55479f647 kprobes: Allow pr... |
368 |
static void free_aggr_kprobe(struct kprobe *p) |
6274de498 kprobes: Support ... |
369 370 371 372 373 374 375 376 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); arch_remove_optimized_kprobe(op); arch_remove_kprobe(p); kfree(op); } |
afd66255b kprobes: Introduc... |
377 378 379 380 381 382 383 384 385 386 387 388 |
/* 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 ... |
389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 |
/* Return true(!0) if the kprobe is disarmed. Note: p must be on hash list */ static inline int kprobe_disarmed(struct kprobe *p) { struct optimized_kprobe *op; /* If kprobe is not aggr/opt probe, just return kprobe is disabled */ if (!kprobe_aggrprobe(p)) return kprobe_disabled(p); op = container_of(p, struct optimized_kprobe, kp); return kprobe_disabled(p) && list_empty(&op->list); } /* Return true(!0) if the probe is queued on (un)optimizing lists */ |
55479f647 kprobes: Allow pr... |
404 |
static int kprobe_queued(struct kprobe *p) |
6274de498 kprobes: Support ... |
405 406 407 408 409 410 411 412 413 414 |
{ 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... |
415 416 417 418 |
/* * Return an optimized kprobe whose optimizing code replaces * instructions including addr (exclude breakpoint). */ |
55479f647 kprobes: Allow pr... |
419 |
static struct kprobe *get_optimized_kprobe(unsigned long addr) |
afd66255b kprobes: Introduc... |
420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 |
{ 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 ... |
440 |
static LIST_HEAD(unoptimizing_list); |
7b959fc58 kprobes: Fix to f... |
441 |
static LIST_HEAD(freeing_list); |
afd66255b kprobes: Introduc... |
442 443 444 445 |
static void kprobe_optimizer(struct work_struct *work); static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer); #define OPTIMIZE_DELAY 5 |
61f4e13ff kprobes: Separate... |
446 447 448 449 |
/* * Optimize (replace a breakpoint with a jump) kprobes listed on * optimizing_list. */ |
55479f647 kprobes: Allow pr... |
450 |
static void do_optimize_kprobes(void) |
afd66255b kprobes: Introduc... |
451 |
{ |
f1c6ece23 kprobes: Fix pote... |
452 |
lockdep_assert_held(&text_mutex); |
afd66255b kprobes: Introduc... |
453 454 455 456 457 458 459 |
/* * The optimization/unoptimization refers online_cpus via * stop_machine() and cpu-hotplug modifies online_cpus. * And same time, text_mutex will be held in cpu-hotplug and here. * This combination can cause a deadlock (cpu-hotplug try to lock * text_mutex but stop_machine can not be done because online_cpus * has been changed) |
2d1e38f56 kprobes: Cure hot... |
460 |
* To avoid this deadlock, caller must have locked cpu hotplug |
afd66255b kprobes: Introduc... |
461 462 |
* for preventing cpu-hotplug outside of text_mutex locking. */ |
2d1e38f56 kprobes: Cure hot... |
463 464 465 466 467 468 |
lockdep_assert_cpus_held(); /* Optimization never be done when disarmed */ if (kprobes_all_disarmed || !kprobes_allow_optimization || list_empty(&optimizing_list)) return; |
cd7ebe229 kprobes: Use text... |
469 |
arch_optimize_kprobes(&optimizing_list); |
61f4e13ff kprobes: Separate... |
470 |
} |
6274de498 kprobes: Support ... |
471 472 473 474 |
/* * Unoptimize (replace a jump with a breakpoint and remove the breakpoint * if need) kprobes listed on unoptimizing_list. */ |
55479f647 kprobes: Allow pr... |
475 |
static void do_unoptimize_kprobes(void) |
6274de498 kprobes: Support ... |
476 477 |
{ struct optimized_kprobe *op, *tmp; |
f1c6ece23 kprobes: Fix pote... |
478 |
lockdep_assert_held(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
479 480 |
/* See comment in do_optimize_kprobes() */ lockdep_assert_cpus_held(); |
6274de498 kprobes: Support ... |
481 482 483 |
/* Unoptimization must be done anytime */ if (list_empty(&unoptimizing_list)) return; |
7b959fc58 kprobes: Fix to f... |
484 |
arch_unoptimize_kprobes(&unoptimizing_list, &freeing_list); |
f984ba4eb kprobes: Use text... |
485 |
/* Loop free_list for disarming */ |
7b959fc58 kprobes: Fix to f... |
486 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
74c515e04 kprobes: Set unop... |
487 488 |
/* Switching from detour code to origin */ op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
489 490 491 492 493 494 495 496 497 498 |
/* 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 ... |
499 500 501 |
} else list_del_init(&op->list); } |
6274de498 kprobes: Support ... |
502 503 504 |
} /* Reclaim all kprobes on the free_list */ |
55479f647 kprobes: Allow pr... |
505 |
static void do_free_cleaned_kprobes(void) |
6274de498 kprobes: Support ... |
506 507 |
{ struct optimized_kprobe *op, *tmp; |
7b959fc58 kprobes: Fix to f... |
508 |
list_for_each_entry_safe(op, tmp, &freeing_list, list) { |
6274de498 kprobes: Support ... |
509 |
list_del_init(&op->list); |
cbdd96f55 kprobes: Don't ca... |
510 511 512 513 514 515 516 |
if (WARN_ON_ONCE(!kprobe_unused(&op->kp))) { /* * This must not happen, but if there is a kprobe * still in use, keep it on kprobes hash list. */ continue; } |
6274de498 kprobes: Support ... |
517 518 519 520 521 |
free_aggr_kprobe(&op->kp); } } /* Start optimizer after OPTIMIZE_DELAY passed */ |
55479f647 kprobes: Allow pr... |
522 |
static void kick_kprobe_optimizer(void) |
6274de498 kprobes: Support ... |
523 |
{ |
ad72b3bea kprobes: fix wait... |
524 |
schedule_delayed_work(&optimizing_work, OPTIMIZE_DELAY); |
6274de498 kprobes: Support ... |
525 |
} |
61f4e13ff kprobes: Separate... |
526 |
/* Kprobe jump optimizer */ |
55479f647 kprobes: Allow pr... |
527 |
static void kprobe_optimizer(struct work_struct *work) |
61f4e13ff kprobes: Separate... |
528 |
{ |
72ef3794c kprobes: Inverse ... |
529 |
mutex_lock(&kprobe_mutex); |
2d1e38f56 kprobes: Cure hot... |
530 |
cpus_read_lock(); |
f1c6ece23 kprobes: Fix pote... |
531 |
mutex_lock(&text_mutex); |
61f4e13ff kprobes: Separate... |
532 533 |
/* Lock modules while optimizing kprobes */ mutex_lock(&module_mutex); |
61f4e13ff kprobes: Separate... |
534 535 |
/* |
6274de498 kprobes: Support ... |
536 537 538 |
* Step 1: Unoptimize kprobes and collect cleaned (unused and disarmed) * kprobes before waiting for quiesence period. */ |
7b959fc58 kprobes: Fix to f... |
539 |
do_unoptimize_kprobes(); |
6274de498 kprobes: Support ... |
540 541 |
/* |
a30b85df7 kprobes: Use sync... |
542 543 544 545 546 547 548 |
* Step 2: Wait for quiesence period to ensure all potentially * preempted tasks to have normally scheduled. Because optprobe * may modify multiple instructions, there is a chance that Nth * instruction is preempted. In that case, such tasks can return * to 2nd-Nth byte of jump instruction. This wait is for avoiding it. * Note that on non-preemptive kernel, this is transparently converted * to synchronoze_sched() to wait for all interrupts to have completed. |
61f4e13ff kprobes: Separate... |
549 |
*/ |
a30b85df7 kprobes: Use sync... |
550 |
synchronize_rcu_tasks(); |
61f4e13ff kprobes: Separate... |
551 |
|
6274de498 kprobes: Support ... |
552 |
/* Step 3: Optimize kprobes after quiesence period */ |
61f4e13ff kprobes: Separate... |
553 |
do_optimize_kprobes(); |
6274de498 kprobes: Support ... |
554 555 |
/* Step 4: Free cleaned kprobes after quiesence period */ |
7b959fc58 kprobes: Fix to f... |
556 |
do_free_cleaned_kprobes(); |
6274de498 kprobes: Support ... |
557 |
|
afd66255b kprobes: Introduc... |
558 |
mutex_unlock(&module_mutex); |
f1c6ece23 kprobes: Fix pote... |
559 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
560 |
cpus_read_unlock(); |
72ef3794c kprobes: Inverse ... |
561 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
562 |
|
cd7ebe229 kprobes: Use text... |
563 |
/* Step 5: Kick optimizer again if needed */ |
f984ba4eb kprobes: Use text... |
564 |
if (!list_empty(&optimizing_list) || !list_empty(&unoptimizing_list)) |
cd7ebe229 kprobes: Use text... |
565 |
kick_kprobe_optimizer(); |
6274de498 kprobes: Support ... |
566 567 568 |
} /* Wait for completing optimization and unoptimization */ |
30e7d894c tracing/kprobes: ... |
569 |
void wait_for_kprobe_optimizer(void) |
6274de498 kprobes: Support ... |
570 |
{ |
ad72b3bea kprobes: fix wait... |
571 572 573 574 575 576 577 578 579 580 581 582 583 584 |
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... |
585 586 587 |
} /* Optimize kprobe if p is ready to be optimized */ |
55479f647 kprobes: Allow pr... |
588 |
static void optimize_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
589 590 591 592 |
{ struct optimized_kprobe *op; /* Check if the kprobe is disabled or not ready for optimization. */ |
b2be84df9 kprobes: Jump opt... |
593 |
if (!kprobe_optready(p) || !kprobes_allow_optimization || |
afd66255b kprobes: Introduc... |
594 595 |
(kprobe_disabled(p) || kprobes_all_disarmed)) return; |
059053a27 kprobes: Don't ch... |
596 597 |
/* kprobes with post_handler can not be optimized */ if (p->post_handler) |
afd66255b kprobes: Introduc... |
598 599 600 601 602 603 604 605 606 607 608 |
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... |
609 |
op->kp.flags |= KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
610 611 612 613 614 615 616 617 618 619 620 |
if (!list_empty(&op->list)) /* This is under unoptimizing. Just dequeue the probe */ list_del_init(&op->list); else { list_add(&op->list, &optimizing_list); kick_kprobe_optimizer(); } } /* Short cut to direct unoptimizing */ |
55479f647 kprobes: Allow pr... |
621 |
static void force_unoptimize_kprobe(struct optimized_kprobe *op) |
6274de498 kprobes: Support ... |
622 |
{ |
2d1e38f56 kprobes: Cure hot... |
623 |
lockdep_assert_cpus_held(); |
6274de498 kprobes: Support ... |
624 |
arch_unoptimize_kprobe(op); |
74c515e04 kprobes: Set unop... |
625 |
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
6274de498 kprobes: Support ... |
626 627 |
if (kprobe_disabled(&op->kp)) arch_disarm_kprobe(&op->kp); |
afd66255b kprobes: Introduc... |
628 629 630 |
} /* Unoptimize a kprobe if p is optimized */ |
55479f647 kprobes: Allow pr... |
631 |
static void unoptimize_kprobe(struct kprobe *p, bool force) |
afd66255b kprobes: Introduc... |
632 633 |
{ struct optimized_kprobe *op; |
6274de498 kprobes: Support ... |
634 635 636 637 638 639 640 641 642 643 644 645 |
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... |
646 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
647 648 649 650 |
force_unoptimize_kprobe(op); } return; } |
6274de498 kprobes: Support ... |
651 652 653 654 655 656 657 658 659 660 661 662 |
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... |
663 664 |
} } |
0490cd1f9 kprobes: Reuse un... |
665 |
/* Cancel unoptimizing for reusing */ |
819319fc9 kprobes: Return e... |
666 |
static int reuse_unused_kprobe(struct kprobe *ap) |
0490cd1f9 kprobes: Reuse un... |
667 668 |
{ struct optimized_kprobe *op; |
0490cd1f9 kprobes: Reuse un... |
669 670 671 672 673 |
/* * Unused kprobe MUST be on the way of delayed unoptimizing (means * there is still a relative jump) and disabled. */ op = container_of(ap, struct optimized_kprobe, kp); |
4458515b2 kprobes: Replace ... |
674 |
WARN_ON_ONCE(list_empty(&op->list)); |
0490cd1f9 kprobes: Reuse un... |
675 676 677 |
/* Enable the probe again */ ap->flags &= ~KPROBE_FLAG_DISABLED; /* Optimize it again (remove from op->list) */ |
5f843ed41 kprobes: Fix erro... |
678 679 |
if (!kprobe_optready(ap)) return -EINVAL; |
819319fc9 kprobes: Return e... |
680 |
|
0490cd1f9 kprobes: Reuse un... |
681 |
optimize_kprobe(ap); |
819319fc9 kprobes: Return e... |
682 |
return 0; |
0490cd1f9 kprobes: Reuse un... |
683 |
} |
afd66255b kprobes: Introduc... |
684 |
/* Remove optimized instructions */ |
55479f647 kprobes: Allow pr... |
685 |
static void kill_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
686 687 688 689 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
6274de498 kprobes: Support ... |
690 691 |
if (!list_empty(&op->list)) /* Dequeue from the (un)optimization queue */ |
afd66255b kprobes: Introduc... |
692 |
list_del_init(&op->list); |
6274de498 kprobes: Support ... |
693 |
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; |
7b959fc58 kprobes: Fix to f... |
694 695 696 697 698 699 700 701 702 703 704 |
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 ... |
705 |
/* Don't touch the code, because it is already freed. */ |
afd66255b kprobes: Introduc... |
706 707 |
arch_remove_optimized_kprobe(op); } |
a460246c7 kprobes: Skip pre... |
708 709 710 711 712 713 |
static inline void __prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p) { if (!kprobe_ftrace(p)) arch_prepare_optimized_kprobe(op, p); } |
afd66255b kprobes: Introduc... |
714 |
/* Try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
715 |
static void prepare_optimized_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
716 717 718 719 |
{ struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); |
a460246c7 kprobes: Skip pre... |
720 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
721 |
} |
afd66255b kprobes: Introduc... |
722 |
/* Allocate new optimized_kprobe and try to prepare optimized instructions */ |
55479f647 kprobes: Allow pr... |
723 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
724 725 726 727 728 729 730 731 732 |
{ struct optimized_kprobe *op; op = kzalloc(sizeof(struct optimized_kprobe), GFP_KERNEL); if (!op) return NULL; INIT_LIST_HEAD(&op->list); op->kp.addr = p->addr; |
a460246c7 kprobes: Skip pre... |
733 |
__prepare_optimized_kprobe(op, p); |
afd66255b kprobes: Introduc... |
734 735 736 |
return &op->kp; } |
55479f647 kprobes: Allow pr... |
737 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p); |
afd66255b kprobes: Introduc... |
738 739 740 741 742 |
/* * Prepare an optimized_kprobe and optimize it * NOTE: p must be a normal registered kprobe */ |
55479f647 kprobes: Allow pr... |
743 |
static void try_to_optimize_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
744 745 746 |
{ struct kprobe *ap; struct optimized_kprobe *op; |
ae6aa16fd kprobes: introduc... |
747 748 749 |
/* Impossible to optimize ftrace-based kprobe */ if (kprobe_ftrace(p)) return; |
25764288d kprobes: Move loc... |
750 |
/* For preparing optimization, jump_label_text_reserved() is called */ |
2d1e38f56 kprobes: Cure hot... |
751 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
752 753 |
jump_label_lock(); mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
754 755 |
ap = alloc_aggr_kprobe(p); if (!ap) |
25764288d kprobes: Move loc... |
756 |
goto out; |
afd66255b kprobes: Introduc... |
757 758 759 760 |
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 ... |
761 762 |
arch_remove_optimized_kprobe(op); kfree(op); |
25764288d kprobes: Move loc... |
763 |
goto out; |
afd66255b kprobes: Introduc... |
764 765 766 |
} init_aggr_kprobe(ap, p); |
25764288d kprobes: Move loc... |
767 768 769 770 771 |
optimize_kprobe(ap); /* This just kicks optimizer thread */ out: mutex_unlock(&text_mutex); jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
772 |
cpus_read_unlock(); |
afd66255b kprobes: Introduc... |
773 |
} |
b2be84df9 kprobes: Jump opt... |
774 |
#ifdef CONFIG_SYSCTL |
55479f647 kprobes: Allow pr... |
775 |
static void optimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
776 777 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
778 779 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
780 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
781 782 |
/* If optimization is already allowed, just return */ if (kprobes_allow_optimization) |
5c51543b0 kprobes: Fix a do... |
783 |
goto out; |
b2be84df9 kprobes: Jump opt... |
784 |
|
2d1e38f56 kprobes: Cure hot... |
785 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
786 |
kprobes_allow_optimization = true; |
b2be84df9 kprobes: Jump opt... |
787 788 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
789 |
hlist_for_each_entry_rcu(p, head, hlist) |
b2be84df9 kprobes: Jump opt... |
790 791 792 |
if (!kprobe_disabled(p)) optimize_kprobe(p); } |
2d1e38f56 kprobes: Cure hot... |
793 |
cpus_read_unlock(); |
b2be84df9 kprobes: Jump opt... |
794 795 |
printk(KERN_INFO "Kprobes globally optimized "); |
5c51543b0 kprobes: Fix a do... |
796 797 |
out: mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
798 |
} |
55479f647 kprobes: Allow pr... |
799 |
static void unoptimize_all_kprobes(void) |
b2be84df9 kprobes: Jump opt... |
800 801 |
{ struct hlist_head *head; |
b2be84df9 kprobes: Jump opt... |
802 803 |
struct kprobe *p; unsigned int i; |
5c51543b0 kprobes: Fix a do... |
804 |
mutex_lock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
805 |
/* If optimization is already prohibited, just return */ |
5c51543b0 kprobes: Fix a do... |
806 807 |
if (!kprobes_allow_optimization) { mutex_unlock(&kprobe_mutex); |
b2be84df9 kprobes: Jump opt... |
808 |
return; |
5c51543b0 kprobes: Fix a do... |
809 |
} |
b2be84df9 kprobes: Jump opt... |
810 |
|
2d1e38f56 kprobes: Cure hot... |
811 |
cpus_read_lock(); |
b2be84df9 kprobes: Jump opt... |
812 |
kprobes_allow_optimization = false; |
b2be84df9 kprobes: Jump opt... |
813 814 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
815 |
hlist_for_each_entry_rcu(p, head, hlist) { |
b2be84df9 kprobes: Jump opt... |
816 |
if (!kprobe_disabled(p)) |
6274de498 kprobes: Support ... |
817 |
unoptimize_kprobe(p, false); |
b2be84df9 kprobes: Jump opt... |
818 819 |
} } |
2d1e38f56 kprobes: Cure hot... |
820 |
cpus_read_unlock(); |
5c51543b0 kprobes: Fix a do... |
821 |
mutex_unlock(&kprobe_mutex); |
6274de498 kprobes: Support ... |
822 823 824 825 |
/* Wait for unoptimizing completion */ wait_for_kprobe_optimizer(); printk(KERN_INFO "Kprobes globally unoptimized "); |
b2be84df9 kprobes: Jump opt... |
826 |
} |
5c51543b0 kprobes: Fix a do... |
827 |
static DEFINE_MUTEX(kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
828 829 830 831 832 833 |
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... |
834 |
mutex_lock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
835 836 837 838 839 840 841 |
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... |
842 |
mutex_unlock(&kprobe_sysctl_mutex); |
b2be84df9 kprobes: Jump opt... |
843 844 845 846 |
return ret; } #endif /* CONFIG_SYSCTL */ |
6274de498 kprobes: Support ... |
847 |
/* Put a breakpoint for a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
848 |
static void __arm_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
849 |
{ |
6d8e40a85 kprobes: Rename o... |
850 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
851 852 |
/* Check collision with other optimized kprobes */ |
6d8e40a85 kprobes: Rename o... |
853 854 |
_p = get_optimized_kprobe((unsigned long)p->addr); if (unlikely(_p)) |
6274de498 kprobes: Support ... |
855 856 |
/* Fallback to unoptimized kprobe */ unoptimize_kprobe(_p, true); |
afd66255b kprobes: Introduc... |
857 858 859 860 |
arch_arm_kprobe(p); optimize_kprobe(p); /* Try to optimize (add kprobe to a list) */ } |
6274de498 kprobes: Support ... |
861 |
/* Remove the breakpoint of a probe. Must be called with text_mutex locked */ |
55479f647 kprobes: Allow pr... |
862 |
static void __disarm_kprobe(struct kprobe *p, bool reopt) |
afd66255b kprobes: Introduc... |
863 |
{ |
6d8e40a85 kprobes: Rename o... |
864 |
struct kprobe *_p; |
afd66255b kprobes: Introduc... |
865 |
|
69d54b916 kprobes: makes kp... |
866 867 |
/* Try to unoptimize */ unoptimize_kprobe(p, kprobes_all_disarmed); |
afd66255b kprobes: Introduc... |
868 |
|
6274de498 kprobes: Support ... |
869 870 871 872 873 874 875 876 |
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... |
877 878 879 880 881 |
} #else /* !CONFIG_OPTPROBES */ #define optimize_kprobe(p) do {} while (0) |
6274de498 kprobes: Support ... |
882 |
#define unoptimize_kprobe(p, f) do {} while (0) |
afd66255b kprobes: Introduc... |
883 884 885 886 |
#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 ... |
887 888 889 |
#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... |
890 |
|
819319fc9 kprobes: Return e... |
891 |
static int reuse_unused_kprobe(struct kprobe *ap) |
0490cd1f9 kprobes: Reuse un... |
892 |
{ |
819319fc9 kprobes: Return e... |
893 894 895 896 897 898 |
/* * If the optimized kprobe is NOT supported, the aggr kprobe is * released at the same time that the last aggregated kprobe is * unregistered. * Thus there should be no chance to reuse unused kprobe. */ |
0490cd1f9 kprobes: Reuse un... |
899 900 |
printk(KERN_ERR "Error: There should be no unused kprobe here. "); |
819319fc9 kprobes: Return e... |
901 |
return -EINVAL; |
0490cd1f9 kprobes: Reuse un... |
902 |
} |
55479f647 kprobes: Allow pr... |
903 |
static void free_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
904 |
{ |
6274de498 kprobes: Support ... |
905 |
arch_remove_kprobe(p); |
afd66255b kprobes: Introduc... |
906 907 |
kfree(p); } |
55479f647 kprobes: Allow pr... |
908 |
static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) |
afd66255b kprobes: Introduc... |
909 910 911 912 |
{ return kzalloc(sizeof(struct kprobe), GFP_KERNEL); } #endif /* CONFIG_OPTPROBES */ |
e7dbfe349 kprobes/x86: Move... |
913 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
914 |
static struct ftrace_ops kprobe_ftrace_ops __read_mostly = { |
e52538965 kprobes/x86: ftra... |
915 |
.func = kprobe_ftrace_handler, |
0bc11ed5a kprobes: Allow kp... |
916 917 918 919 920 |
.flags = FTRACE_OPS_FL_SAVE_REGS, }; static struct ftrace_ops kprobe_ipmodify_ops __read_mostly = { .func = kprobe_ftrace_handler, |
1d70be34d kprobes: Add IPMO... |
921 |
.flags = FTRACE_OPS_FL_SAVE_REGS | FTRACE_OPS_FL_IPMODIFY, |
ae6aa16fd kprobes: introduc... |
922 |
}; |
0bc11ed5a kprobes: Allow kp... |
923 924 |
static int kprobe_ipmodify_enabled; |
ae6aa16fd kprobes: introduc... |
925 926 927 |
static int kprobe_ftrace_enabled; /* Must ensure p->addr is really on ftrace */ |
55479f647 kprobes: Allow pr... |
928 |
static int prepare_kprobe(struct kprobe *p) |
ae6aa16fd kprobes: introduc... |
929 930 931 932 933 934 935 936 |
{ if (!kprobe_ftrace(p)) return arch_prepare_kprobe(p); return arch_prepare_kprobe_ftrace(p); } /* Caller must lock kprobe_mutex */ |
0bc11ed5a kprobes: Allow kp... |
937 938 |
static int __arm_kprobe_ftrace(struct kprobe *p, struct ftrace_ops *ops, int *cnt) |
ae6aa16fd kprobes: introduc... |
939 |
{ |
12310e343 kprobes: Propagat... |
940 |
int ret = 0; |
ae6aa16fd kprobes: introduc... |
941 |
|
0bc11ed5a kprobes: Allow kp... |
942 |
ret = ftrace_set_filter_ip(ops, (unsigned long)p->addr, 0, 0); |
12310e343 kprobes: Propagat... |
943 |
if (ret) { |
4458515b2 kprobes: Replace ... |
944 945 946 |
pr_debug("Failed to arm kprobe-ftrace at %pS (%d) ", p->addr, ret); |
12310e343 kprobes: Propagat... |
947 948 |
return ret; } |
0bc11ed5a kprobes: Allow kp... |
949 950 |
if (*cnt == 0) { ret = register_ftrace_function(ops); |
12310e343 kprobes: Propagat... |
951 952 953 954 955 |
if (ret) { pr_debug("Failed to init kprobe-ftrace (%d) ", ret); goto err_ftrace; } |
ae6aa16fd kprobes: introduc... |
956 |
} |
12310e343 kprobes: Propagat... |
957 |
|
0bc11ed5a kprobes: Allow kp... |
958 |
(*cnt)++; |
12310e343 kprobes: Propagat... |
959 960 961 962 |
return ret; err_ftrace: /* |
0bc11ed5a kprobes: Allow kp... |
963 964 |
* At this point, sinec ops is not registered, we should be sefe from * registering empty filter. |
12310e343 kprobes: Propagat... |
965 |
*/ |
0bc11ed5a kprobes: Allow kp... |
966 |
ftrace_set_filter_ip(ops, (unsigned long)p->addr, 1, 0); |
12310e343 kprobes: Propagat... |
967 |
return ret; |
ae6aa16fd kprobes: introduc... |
968 |
} |
0bc11ed5a kprobes: Allow kp... |
969 970 971 972 973 974 975 976 |
static int arm_kprobe_ftrace(struct kprobe *p) { bool ipmodify = (p->post_handler != NULL); return __arm_kprobe_ftrace(p, ipmodify ? &kprobe_ipmodify_ops : &kprobe_ftrace_ops, ipmodify ? &kprobe_ipmodify_enabled : &kprobe_ftrace_enabled); } |
ae6aa16fd kprobes: introduc... |
977 |
/* Caller must lock kprobe_mutex */ |
0bc11ed5a kprobes: Allow kp... |
978 979 |
static int __disarm_kprobe_ftrace(struct kprobe *p, struct ftrace_ops *ops, int *cnt) |
ae6aa16fd kprobes: introduc... |
980 |
{ |
297f9233b kprobes: Propagat... |
981 |
int ret = 0; |
ae6aa16fd kprobes: introduc... |
982 |
|
0bc11ed5a kprobes: Allow kp... |
983 984 |
if (*cnt == 1) { ret = unregister_ftrace_function(ops); |
297f9233b kprobes: Propagat... |
985 986 987 |
if (WARN(ret < 0, "Failed to unregister kprobe-ftrace (%d) ", ret)) return ret; |
ae6aa16fd kprobes: introduc... |
988 |
} |
297f9233b kprobes: Propagat... |
989 |
|
0bc11ed5a kprobes: Allow kp... |
990 |
(*cnt)--; |
297f9233b kprobes: Propagat... |
991 |
|
0bc11ed5a kprobes: Allow kp... |
992 |
ret = ftrace_set_filter_ip(ops, (unsigned long)p->addr, 1, 0); |
4458515b2 kprobes: Replace ... |
993 994 995 |
WARN_ONCE(ret < 0, "Failed to disarm kprobe-ftrace at %pS (%d) ", p->addr, ret); |
297f9233b kprobes: Propagat... |
996 |
return ret; |
ae6aa16fd kprobes: introduc... |
997 |
} |
0bc11ed5a kprobes: Allow kp... |
998 999 1000 1001 1002 1003 1004 1005 1006 |
static int disarm_kprobe_ftrace(struct kprobe *p) { bool ipmodify = (p->post_handler != NULL); return __disarm_kprobe_ftrace(p, ipmodify ? &kprobe_ipmodify_ops : &kprobe_ftrace_ops, ipmodify ? &kprobe_ipmodify_enabled : &kprobe_ftrace_enabled); } |
e7dbfe349 kprobes/x86: Move... |
1007 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
1008 |
#define prepare_kprobe(p) arch_prepare_kprobe(p) |
12310e343 kprobes: Propagat... |
1009 |
#define arm_kprobe_ftrace(p) (-ENODEV) |
297f9233b kprobes: Propagat... |
1010 |
#define disarm_kprobe_ftrace(p) (-ENODEV) |
ae6aa16fd kprobes: introduc... |
1011 |
#endif |
201517a7f kprobes: fix to u... |
1012 |
/* Arm a kprobe with text_mutex */ |
12310e343 kprobes: Propagat... |
1013 |
static int arm_kprobe(struct kprobe *kp) |
201517a7f kprobes: fix to u... |
1014 |
{ |
12310e343 kprobes: Propagat... |
1015 1016 |
if (unlikely(kprobe_ftrace(kp))) return arm_kprobe_ftrace(kp); |
2d1e38f56 kprobes: Cure hot... |
1017 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
1018 |
mutex_lock(&text_mutex); |
afd66255b kprobes: Introduc... |
1019 |
__arm_kprobe(kp); |
201517a7f kprobes: fix to u... |
1020 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1021 |
cpus_read_unlock(); |
12310e343 kprobes: Propagat... |
1022 1023 |
return 0; |
201517a7f kprobes: fix to u... |
1024 1025 1026 |
} /* Disarm a kprobe with text_mutex */ |
297f9233b kprobes: Propagat... |
1027 |
static int disarm_kprobe(struct kprobe *kp, bool reopt) |
201517a7f kprobes: fix to u... |
1028 |
{ |
297f9233b kprobes: Propagat... |
1029 1030 |
if (unlikely(kprobe_ftrace(kp))) return disarm_kprobe_ftrace(kp); |
2d1e38f56 kprobes: Cure hot... |
1031 1032 |
cpus_read_lock(); |
201517a7f kprobes: fix to u... |
1033 |
mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
1034 |
__disarm_kprobe(kp, reopt); |
201517a7f kprobes: fix to u... |
1035 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1036 |
cpus_read_unlock(); |
297f9233b kprobes: Propagat... |
1037 1038 |
return 0; |
201517a7f kprobes: fix to u... |
1039 |
} |
64f562c6d [PATCH] kprobes: ... |
1040 1041 1042 1043 |
/* * Aggregate handlers for multiple kprobes support - these handlers * take care of invoking the individual kprobe handlers on p->list */ |
820aede02 kprobes: Use NOKP... |
1044 |
static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs) |
64f562c6d [PATCH] kprobes: ... |
1045 1046 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1047 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1048 |
if (kp->pre_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1049 |
set_kprobe_instance(kp); |
8b0914ea7 [PATCH] jprobes: ... |
1050 1051 |
if (kp->pre_handler(kp, regs)) return 1; |
64f562c6d [PATCH] kprobes: ... |
1052 |
} |
e65845235 [PATCH] Kprobes: ... |
1053 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1054 1055 1056 |
} return 0; } |
820aede02 kprobes: Use NOKP... |
1057 |
NOKPROBE_SYMBOL(aggr_pre_handler); |
64f562c6d [PATCH] kprobes: ... |
1058 |
|
820aede02 kprobes: Use NOKP... |
1059 1060 |
static void aggr_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) |
64f562c6d [PATCH] kprobes: ... |
1061 1062 |
{ struct kprobe *kp; |
3516a4604 [PATCH] Kprobes: ... |
1063 |
list_for_each_entry_rcu(kp, &p->list, list) { |
de5bd88d5 kprobes: support ... |
1064 |
if (kp->post_handler && likely(!kprobe_disabled(kp))) { |
e65845235 [PATCH] Kprobes: ... |
1065 |
set_kprobe_instance(kp); |
64f562c6d [PATCH] kprobes: ... |
1066 |
kp->post_handler(kp, regs, flags); |
e65845235 [PATCH] Kprobes: ... |
1067 |
reset_kprobe_instance(); |
64f562c6d [PATCH] kprobes: ... |
1068 1069 |
} } |
64f562c6d [PATCH] kprobes: ... |
1070 |
} |
820aede02 kprobes: Use NOKP... |
1071 |
NOKPROBE_SYMBOL(aggr_post_handler); |
64f562c6d [PATCH] kprobes: ... |
1072 |
|
820aede02 kprobes: Use NOKP... |
1073 1074 |
static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs, int trapnr) |
64f562c6d [PATCH] kprobes: ... |
1075 |
{ |
b76834bc1 kprobes: Use this... |
1076 |
struct kprobe *cur = __this_cpu_read(kprobe_instance); |
e65845235 [PATCH] Kprobes: ... |
1077 |
|
64f562c6d [PATCH] kprobes: ... |
1078 1079 1080 1081 |
/* * if we faulted "during" the execution of a user specified * probe handler, invoke just that probe's fault handler */ |
e65845235 [PATCH] Kprobes: ... |
1082 1083 |
if (cur && cur->fault_handler) { if (cur->fault_handler(cur, regs, trapnr)) |
64f562c6d [PATCH] kprobes: ... |
1084 1085 1086 1087 |
return 1; } return 0; } |
820aede02 kprobes: Use NOKP... |
1088 |
NOKPROBE_SYMBOL(aggr_fault_handler); |
64f562c6d [PATCH] kprobes: ... |
1089 |
|
bf8d5c52c [PATCH] kprobes: ... |
1090 |
/* Walks the list and increments nmissed count for multiprobe case */ |
820aede02 kprobes: Use NOKP... |
1091 |
void kprobes_inc_nmissed_count(struct kprobe *p) |
bf8d5c52c [PATCH] kprobes: ... |
1092 1093 |
{ struct kprobe *kp; |
afd66255b kprobes: Introduc... |
1094 |
if (!kprobe_aggrprobe(p)) { |
bf8d5c52c [PATCH] kprobes: ... |
1095 1096 1097 1098 1099 1100 1101 |
p->nmissed++; } else { list_for_each_entry_rcu(kp, &p->list, list) kp->nmissed++; } return; } |
820aede02 kprobes: Use NOKP... |
1102 |
NOKPROBE_SYMBOL(kprobes_inc_nmissed_count); |
bf8d5c52c [PATCH] kprobes: ... |
1103 |
|
820aede02 kprobes: Use NOKP... |
1104 1105 |
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head) |
b94cce926 [PATCH] kprobes: ... |
1106 |
{ |
ef53d9c5e kprobes: improve ... |
1107 |
struct kretprobe *rp = ri->rp; |
b94cce926 [PATCH] kprobes: ... |
1108 1109 |
/* remove rp inst off the rprobe_inst_table */ hlist_del(&ri->hlist); |
ef53d9c5e kprobes: improve ... |
1110 1111 |
INIT_HLIST_NODE(&ri->hlist); if (likely(rp)) { |
ec484608c locking, kprobes:... |
1112 |
raw_spin_lock(&rp->lock); |
ef53d9c5e kprobes: improve ... |
1113 |
hlist_add_head(&ri->hlist, &rp->free_instances); |
ec484608c locking, kprobes:... |
1114 |
raw_spin_unlock(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1115 1116 |
} else /* Unregistering */ |
99219a3fb [PATCH] kretprobe... |
1117 |
hlist_add_head(&ri->hlist, head); |
b94cce926 [PATCH] kprobes: ... |
1118 |
} |
820aede02 kprobes: Use NOKP... |
1119 |
NOKPROBE_SYMBOL(recycle_rp_inst); |
b94cce926 [PATCH] kprobes: ... |
1120 |
|
820aede02 kprobes: Use NOKP... |
1121 |
void kretprobe_hash_lock(struct task_struct *tsk, |
ef53d9c5e kprobes: improve ... |
1122 |
struct hlist_head **head, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1123 |
__acquires(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1124 1125 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1126 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1127 1128 1129 |
*head = &kretprobe_inst_table[hash]; hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1130 |
raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1131 |
} |
820aede02 kprobes: Use NOKP... |
1132 |
NOKPROBE_SYMBOL(kretprobe_hash_lock); |
ef53d9c5e kprobes: improve ... |
1133 |
|
820aede02 kprobes: Use NOKP... |
1134 1135 |
static void kretprobe_table_lock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1136 |
__acquires(hlist_lock) |
b94cce926 [PATCH] kprobes: ... |
1137 |
{ |
ec484608c locking, kprobes:... |
1138 1139 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_lock_irqsave(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1140 |
} |
820aede02 kprobes: Use NOKP... |
1141 |
NOKPROBE_SYMBOL(kretprobe_table_lock); |
ef53d9c5e kprobes: improve ... |
1142 |
|
820aede02 kprobes: Use NOKP... |
1143 1144 |
void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1145 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1146 1147 |
{ unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1148 |
raw_spinlock_t *hlist_lock; |
ef53d9c5e kprobes: improve ... |
1149 1150 |
hlist_lock = kretprobe_table_lock_ptr(hash); |
ec484608c locking, kprobes:... |
1151 |
raw_spin_unlock_irqrestore(hlist_lock, *flags); |
ef53d9c5e kprobes: improve ... |
1152 |
} |
820aede02 kprobes: Use NOKP... |
1153 |
NOKPROBE_SYMBOL(kretprobe_hash_unlock); |
ef53d9c5e kprobes: improve ... |
1154 |
|
820aede02 kprobes: Use NOKP... |
1155 1156 |
static void kretprobe_table_unlock(unsigned long hash, unsigned long *flags) |
635c17c2b kprobes: Add spar... |
1157 |
__releases(hlist_lock) |
ef53d9c5e kprobes: improve ... |
1158 |
{ |
ec484608c locking, kprobes:... |
1159 1160 |
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash); raw_spin_unlock_irqrestore(hlist_lock, *flags); |
b94cce926 [PATCH] kprobes: ... |
1161 |
} |
820aede02 kprobes: Use NOKP... |
1162 |
NOKPROBE_SYMBOL(kretprobe_table_unlock); |
b94cce926 [PATCH] kprobes: ... |
1163 |
|
b94cce926 [PATCH] kprobes: ... |
1164 |
/* |
c6fd91f0b [PATCH] kretprobe... |
1165 1166 1167 1168 |
* 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: ... |
1169 |
*/ |
820aede02 kprobes: Use NOKP... |
1170 |
void kprobe_flush_task(struct task_struct *tk) |
b94cce926 [PATCH] kprobes: ... |
1171 |
{ |
62c27be0d [PATCH] kprobe wh... |
1172 |
struct kretprobe_instance *ri; |
99219a3fb [PATCH] kretprobe... |
1173 |
struct hlist_head *head, empty_rp; |
b67bfe0d4 hlist: drop the n... |
1174 |
struct hlist_node *tmp; |
ef53d9c5e kprobes: improve ... |
1175 |
unsigned long hash, flags = 0; |
802eae7c8 [PATCH] Return pr... |
1176 |
|
ef53d9c5e kprobes: improve ... |
1177 1178 1179 |
if (unlikely(!kprobes_initialized)) /* Early boot. kretprobe_table_locks not yet initialized. */ return; |
d496aab56 kprobes: initiali... |
1180 |
INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5e kprobes: improve ... |
1181 1182 1183 |
hash = hash_ptr(tk, KPROBE_HASH_BITS); head = &kretprobe_inst_table[hash]; kretprobe_table_lock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1184 |
hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
62c27be0d [PATCH] kprobe wh... |
1185 |
if (ri->task == tk) |
99219a3fb [PATCH] kretprobe... |
1186 |
recycle_rp_inst(ri, &empty_rp); |
62c27be0d [PATCH] kprobe wh... |
1187 |
} |
ef53d9c5e kprobes: improve ... |
1188 |
kretprobe_table_unlock(hash, &flags); |
b67bfe0d4 hlist: drop the n... |
1189 |
hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3fb [PATCH] kretprobe... |
1190 1191 1192 |
hlist_del(&ri->hlist); kfree(ri); } |
b94cce926 [PATCH] kprobes: ... |
1193 |
} |
820aede02 kprobes: Use NOKP... |
1194 |
NOKPROBE_SYMBOL(kprobe_flush_task); |
b94cce926 [PATCH] kprobes: ... |
1195 |
|
b94cce926 [PATCH] kprobes: ... |
1196 1197 1198 |
static inline void free_rp_inst(struct kretprobe *rp) { struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1199 |
struct hlist_node *next; |
4c4308cb9 kprobes: kretprob... |
1200 |
|
b67bfe0d4 hlist: drop the n... |
1201 |
hlist_for_each_entry_safe(ri, next, &rp->free_instances, hlist) { |
ef53d9c5e kprobes: improve ... |
1202 |
hlist_del(&ri->hlist); |
b94cce926 [PATCH] kprobes: ... |
1203 1204 1205 |
kfree(ri); } } |
820aede02 kprobes: Use NOKP... |
1206 |
static void cleanup_rp_inst(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1207 |
{ |
ef53d9c5e kprobes: improve ... |
1208 |
unsigned long flags, hash; |
4a296e07c kprobes: add (un)... |
1209 |
struct kretprobe_instance *ri; |
b67bfe0d4 hlist: drop the n... |
1210 |
struct hlist_node *next; |
ef53d9c5e kprobes: improve ... |
1211 |
struct hlist_head *head; |
4a296e07c kprobes: add (un)... |
1212 |
/* No race here */ |
ef53d9c5e kprobes: improve ... |
1213 1214 1215 |
for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) { kretprobe_table_lock(hash, &flags); head = &kretprobe_inst_table[hash]; |
b67bfe0d4 hlist: drop the n... |
1216 |
hlist_for_each_entry_safe(ri, next, head, hlist) { |
ef53d9c5e kprobes: improve ... |
1217 1218 1219 1220 |
if (ri->rp == rp) ri->rp = NULL; } kretprobe_table_unlock(hash, &flags); |
4a296e07c kprobes: add (un)... |
1221 |
} |
4a296e07c kprobes: add (un)... |
1222 1223 |
free_rp_inst(rp); } |
820aede02 kprobes: Use NOKP... |
1224 |
NOKPROBE_SYMBOL(cleanup_rp_inst); |
4a296e07c kprobes: add (un)... |
1225 |
|
059053a27 kprobes: Don't ch... |
1226 |
/* Add the new probe to ap->list */ |
55479f647 kprobes: Allow pr... |
1227 |
static int add_new_kprobe(struct kprobe *ap, struct kprobe *p) |
8b0914ea7 [PATCH] jprobes: ... |
1228 |
{ |
059053a27 kprobes: Don't ch... |
1229 |
if (p->post_handler) |
6274de498 kprobes: Support ... |
1230 |
unoptimize_kprobe(ap, true); /* Fall back to normal kprobe */ |
afd66255b kprobes: Introduc... |
1231 |
|
059053a27 kprobes: Don't ch... |
1232 |
list_add_rcu(&p->list, &ap->list); |
b918e5e60 kprobes: cleanup ... |
1233 1234 |
if (p->post_handler && !ap->post_handler) ap->post_handler = aggr_post_handler; |
de5bd88d5 kprobes: support ... |
1235 |
|
8b0914ea7 [PATCH] jprobes: ... |
1236 1237 1238 1239 |
return 0; } /* |
64f562c6d [PATCH] kprobes: ... |
1240 1241 1242 |
* Fill in the required fields of the "manager kprobe". Replace the * earlier kprobe in the hlist with the manager kprobe */ |
55479f647 kprobes: Allow pr... |
1243 |
static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1244 |
{ |
afd66255b kprobes: Introduc... |
1245 |
/* Copy p's insn slot to ap */ |
8b0914ea7 [PATCH] jprobes: ... |
1246 |
copy_kprobe(p, ap); |
a9ad965ea [PATCH] IA64: kpr... |
1247 |
flush_insn_slot(ap); |
64f562c6d [PATCH] kprobes: ... |
1248 |
ap->addr = p->addr; |
afd66255b kprobes: Introduc... |
1249 |
ap->flags = p->flags & ~KPROBE_FLAG_OPTIMIZED; |
64f562c6d [PATCH] kprobes: ... |
1250 |
ap->pre_handler = aggr_pre_handler; |
64f562c6d [PATCH] kprobes: ... |
1251 |
ap->fault_handler = aggr_fault_handler; |
e8386a0cb kprobes: support ... |
1252 1253 |
/* We don't care the kprobe which has gone. */ if (p->post_handler && !kprobe_gone(p)) |
367216567 [PATCH] Kprobe: m... |
1254 |
ap->post_handler = aggr_post_handler; |
64f562c6d [PATCH] kprobes: ... |
1255 1256 |
INIT_LIST_HEAD(&ap->list); |
afd66255b kprobes: Introduc... |
1257 |
INIT_HLIST_NODE(&ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1258 |
|
afd66255b kprobes: Introduc... |
1259 |
list_add_rcu(&p->list, &ap->list); |
adad0f331 [PATCH] kprobes: ... |
1260 |
hlist_replace_rcu(&p->hlist, &ap->hlist); |
64f562c6d [PATCH] kprobes: ... |
1261 1262 1263 1264 1265 |
} /* * This is the second or subsequent kprobe at the address - handle * the intricacies |
64f562c6d [PATCH] kprobes: ... |
1266 |
*/ |
55479f647 kprobes: Allow pr... |
1267 |
static int register_aggr_kprobe(struct kprobe *orig_p, struct kprobe *p) |
64f562c6d [PATCH] kprobes: ... |
1268 1269 |
{ int ret = 0; |
6d8e40a85 kprobes: Rename o... |
1270 |
struct kprobe *ap = orig_p; |
64f562c6d [PATCH] kprobes: ... |
1271 |
|
2d1e38f56 kprobes: Cure hot... |
1272 |
cpus_read_lock(); |
25764288d kprobes: Move loc... |
1273 1274 |
/* For preparing optimization, jump_label_text_reserved() is called */ jump_label_lock(); |
25764288d kprobes: Move loc... |
1275 |
mutex_lock(&text_mutex); |
6d8e40a85 kprobes: Rename o... |
1276 1277 1278 |
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... |
1279 1280 1281 1282 |
if (!ap) { ret = -ENOMEM; goto out; } |
6d8e40a85 kprobes: Rename o... |
1283 |
init_aggr_kprobe(ap, orig_p); |
819319fc9 kprobes: Return e... |
1284 |
} else if (kprobe_unused(ap)) { |
0490cd1f9 kprobes: Reuse un... |
1285 |
/* This probe is going to die. Rescue it */ |
819319fc9 kprobes: Return e... |
1286 1287 1288 1289 |
ret = reuse_unused_kprobe(ap); if (ret) goto out; } |
b918e5e60 kprobes: cleanup ... |
1290 1291 |
if (kprobe_gone(ap)) { |
e8386a0cb kprobes: support ... |
1292 1293 1294 1295 1296 1297 |
/* * 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 ... |
1298 |
ret = arch_prepare_kprobe(ap); |
e8386a0cb kprobes: support ... |
1299 |
if (ret) |
b918e5e60 kprobes: cleanup ... |
1300 1301 1302 1303 1304 |
/* * 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... |
1305 |
goto out; |
de5bd88d5 kprobes: support ... |
1306 |
|
afd66255b kprobes: Introduc... |
1307 1308 |
/* Prepare optimized instructions if possible. */ prepare_optimized_kprobe(ap); |
e8386a0cb kprobes: support ... |
1309 |
/* |
de5bd88d5 kprobes: support ... |
1310 1311 |
* Clear gone flag to prevent allocating new slot again, and * set disabled flag because it is not armed yet. |
e8386a0cb kprobes: support ... |
1312 |
*/ |
de5bd88d5 kprobes: support ... |
1313 1314 |
ap->flags = (ap->flags & ~KPROBE_FLAG_GONE) | KPROBE_FLAG_DISABLED; |
e8386a0cb kprobes: support ... |
1315 |
} |
b918e5e60 kprobes: cleanup ... |
1316 |
|
afd66255b kprobes: Introduc... |
1317 |
/* Copy ap's insn slot to p */ |
b918e5e60 kprobes: cleanup ... |
1318 |
copy_kprobe(ap, p); |
25764288d kprobes: Move loc... |
1319 1320 1321 1322 |
ret = add_new_kprobe(ap, p); out: mutex_unlock(&text_mutex); |
25764288d kprobes: Move loc... |
1323 |
jump_label_unlock(); |
2d1e38f56 kprobes: Cure hot... |
1324 |
cpus_read_unlock(); |
25764288d kprobes: Move loc... |
1325 1326 1327 |
if (ret == 0 && kprobe_disabled(ap) && !kprobe_disabled(p)) { ap->flags &= ~KPROBE_FLAG_DISABLED; |
12310e343 kprobes: Propagat... |
1328 |
if (!kprobes_all_disarmed) { |
25764288d kprobes: Move loc... |
1329 |
/* Arm the breakpoint again. */ |
12310e343 kprobes: Propagat... |
1330 1331 1332 1333 |
ret = arm_kprobe(ap); if (ret) { ap->flags |= KPROBE_FLAG_DISABLED; list_del_rcu(&p->list); |
ae8b7ce76 kprobes: Replace ... |
1334 |
synchronize_rcu(); |
12310e343 kprobes: Propagat... |
1335 1336 |
} } |
25764288d kprobes: Move loc... |
1337 1338 |
} return ret; |
64f562c6d [PATCH] kprobes: ... |
1339 |
} |
be8f27432 kprobes: Prohibit... |
1340 1341 1342 1343 1344 1345 |
bool __weak arch_within_kprobe_blacklist(unsigned long addr) { /* The __kprobes marked functions and entry code must not be probed */ return addr >= (unsigned long)__kprobes_text_start && addr < (unsigned long)__kprobes_text_end; } |
6143c6fb1 kprobes: Search n... |
1346 |
static bool __within_kprobe_blacklist(unsigned long addr) |
d0aaff979 [PATCH] Kprobes: ... |
1347 |
{ |
376e24242 kprobes: Introduc... |
1348 |
struct kprobe_blacklist_entry *ent; |
3d8d996e0 kprobes: prevent ... |
1349 |
|
be8f27432 kprobes: Prohibit... |
1350 |
if (arch_within_kprobe_blacklist(addr)) |
376e24242 kprobes: Introduc... |
1351 |
return true; |
3d8d996e0 kprobes: prevent ... |
1352 1353 1354 1355 |
/* * If there exists a kprobe_blacklist, verify and * fail any probe registration in the prohibited area */ |
376e24242 kprobes: Introduc... |
1356 1357 1358 |
list_for_each_entry(ent, &kprobe_blacklist, list) { if (addr >= ent->start_addr && addr < ent->end_addr) return true; |
3d8d996e0 kprobes: prevent ... |
1359 |
} |
6143c6fb1 kprobes: Search n... |
1360 1361 |
return false; } |
376e24242 kprobes: Introduc... |
1362 |
|
6143c6fb1 kprobes: Search n... |
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 |
bool within_kprobe_blacklist(unsigned long addr) { char symname[KSYM_NAME_LEN], *p; if (__within_kprobe_blacklist(addr)) return true; /* Check if the address is on a suffixed-symbol */ if (!lookup_symbol_name(addr, symname)) { p = strchr(symname, '.'); if (!p) return false; *p = '\0'; addr = (unsigned long)kprobe_lookup_name(symname, 0); if (addr) return __within_kprobe_blacklist(addr); } |
376e24242 kprobes: Introduc... |
1380 |
return false; |
d0aaff979 [PATCH] Kprobes: ... |
1381 |
} |
b2a5cd693 kprobes: fix a nu... |
1382 1383 1384 |
/* * 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 -... |
1385 1386 |
* This returns encoded errors if it fails to look up symbol or invalid * combination of parameters. |
b2a5cd693 kprobes: fix a nu... |
1387 |
*/ |
1d585e709 trace/kprobes: Fi... |
1388 1389 |
static kprobe_opcode_t *_kprobe_addr(kprobe_opcode_t *addr, const char *symbol_name, unsigned int offset) |
b2a5cd693 kprobes: fix a nu... |
1390 |
{ |
1d585e709 trace/kprobes: Fi... |
1391 |
if ((symbol_name && addr) || (!symbol_name && !addr)) |
bc81d48d1 kprobes: Return -... |
1392 |
goto invalid; |
1d585e709 trace/kprobes: Fi... |
1393 |
if (symbol_name) { |
7246f6006 Merge tag 'powerp... |
1394 |
addr = kprobe_lookup_name(symbol_name, offset); |
bc81d48d1 kprobes: Return -... |
1395 1396 |
if (!addr) return ERR_PTR(-ENOENT); |
b2a5cd693 kprobes: fix a nu... |
1397 |
} |
1d585e709 trace/kprobes: Fi... |
1398 |
addr = (kprobe_opcode_t *)(((char *)addr) + offset); |
bc81d48d1 kprobes: Return -... |
1399 1400 1401 1402 1403 |
if (addr) return addr; invalid: return ERR_PTR(-EINVAL); |
b2a5cd693 kprobes: fix a nu... |
1404 |
} |
1d585e709 trace/kprobes: Fi... |
1405 1406 1407 1408 |
static kprobe_opcode_t *kprobe_addr(struct kprobe *p) { return _kprobe_addr(p->addr, p->symbol_name, p->offset); } |
1f0ab4097 kprobes: Prevent ... |
1409 |
/* Check passed kprobe is valid and return kprobe in kprobe_table. */ |
55479f647 kprobes: Allow pr... |
1410 |
static struct kprobe *__get_valid_kprobe(struct kprobe *p) |
1f0ab4097 kprobes: Prevent ... |
1411 |
{ |
6d8e40a85 kprobes: Rename o... |
1412 |
struct kprobe *ap, *list_p; |
1f0ab4097 kprobes: Prevent ... |
1413 |
|
6d8e40a85 kprobes: Rename o... |
1414 1415 |
ap = get_kprobe(p->addr); if (unlikely(!ap)) |
1f0ab4097 kprobes: Prevent ... |
1416 |
return NULL; |
6d8e40a85 kprobes: Rename o... |
1417 1418 |
if (p != ap) { list_for_each_entry_rcu(list_p, &ap->list, list) |
1f0ab4097 kprobes: Prevent ... |
1419 1420 1421 1422 1423 1424 |
if (list_p == p) /* kprobe p is a valid probe */ goto valid; return NULL; } valid: |
6d8e40a85 kprobes: Rename o... |
1425 |
return ap; |
1f0ab4097 kprobes: Prevent ... |
1426 1427 1428 1429 1430 1431 |
} /* Return error if the kprobe is being re-registered */ static inline int check_kprobe_rereg(struct kprobe *p) { int ret = 0; |
1f0ab4097 kprobes: Prevent ... |
1432 1433 |
mutex_lock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1434 |
if (__get_valid_kprobe(p)) |
1f0ab4097 kprobes: Prevent ... |
1435 1436 |
ret = -EINVAL; mutex_unlock(&kprobe_mutex); |
6d8e40a85 kprobes: Rename o... |
1437 |
|
1f0ab4097 kprobes: Prevent ... |
1438 1439 |
return ret; } |
f7f242ff0 kprobes: introduc... |
1440 |
int __weak arch_check_ftrace_location(struct kprobe *p) |
1da177e4c Linux-2.6.12-rc2 |
1441 |
{ |
ae6aa16fd kprobes: introduc... |
1442 |
unsigned long ftrace_addr; |
ae6aa16fd kprobes: introduc... |
1443 1444 |
ftrace_addr = ftrace_location((unsigned long)p->addr); if (ftrace_addr) { |
e7dbfe349 kprobes/x86: Move... |
1445 |
#ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16fd kprobes: introduc... |
1446 1447 1448 |
/* Given address is not on the instruction boundary */ if ((unsigned long)p->addr != ftrace_addr) return -EILSEQ; |
ae6aa16fd kprobes: introduc... |
1449 |
p->flags |= KPROBE_FLAG_FTRACE; |
e7dbfe349 kprobes/x86: Move... |
1450 |
#else /* !CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16fd kprobes: introduc... |
1451 1452 1453 |
return -EINVAL; #endif } |
f7f242ff0 kprobes: introduc... |
1454 1455 1456 1457 1458 1459 1460 |
return 0; } static int check_kprobe_address_safe(struct kprobe *p, struct module **probed_mod) { int ret; |
1f0ab4097 kprobes: Prevent ... |
1461 |
|
f7f242ff0 kprobes: introduc... |
1462 1463 1464 |
ret = arch_check_ftrace_location(p); if (ret) return ret; |
91bad2f8d jump label: Fix d... |
1465 |
jump_label_lock(); |
de31c3ca8 jump label: Fix e... |
1466 |
preempt_disable(); |
f7fa6ef0d kprobes: cleanup ... |
1467 1468 |
/* Ensure it is not in reserved area nor out of text */ |
ec30c5f3a kprobes: Use kern... |
1469 |
if (!kernel_text_address((unsigned long) p->addr) || |
376e24242 kprobes: Introduc... |
1470 |
within_kprobe_blacklist((unsigned long) p->addr) || |
e336b4027 kprobes: Prohibit... |
1471 1472 |
jump_label_text_reserved(p->addr, p->addr) || find_bug((unsigned long)p->addr)) { |
f986a499e kprobes: return p... |
1473 |
ret = -EINVAL; |
f7fa6ef0d kprobes: cleanup ... |
1474 |
goto out; |
f986a499e kprobes: return p... |
1475 |
} |
b3e55c727 [PATCH] Kprobes: ... |
1476 |
|
f7fa6ef0d kprobes: cleanup ... |
1477 1478 1479 |
/* Check if are we probing a module */ *probed_mod = __module_text_address((unsigned long) p->addr); if (*probed_mod) { |
6f716acd5 kprobes: codingst... |
1480 |
/* |
e8386a0cb kprobes: support ... |
1481 1482 |
* We must hold a refcount of the probed module while updating * its code to prohibit unexpected unloading. |
df019b1d8 [PATCH] kprobes: ... |
1483 |
*/ |
f7fa6ef0d kprobes: cleanup ... |
1484 1485 1486 1487 |
if (unlikely(!try_module_get(*probed_mod))) { ret = -ENOENT; goto out; } |
de31c3ca8 jump label: Fix e... |
1488 |
|
f24659d96 kprobes: support ... |
1489 1490 1491 1492 |
/* * If the module freed .init.text, we couldn't insert * kprobes in there. */ |
f7fa6ef0d kprobes: cleanup ... |
1493 1494 1495 1496 1497 |
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 ... |
1498 |
} |
df019b1d8 [PATCH] kprobes: ... |
1499 |
} |
f7fa6ef0d kprobes: cleanup ... |
1500 |
out: |
a189d0350 kprobes: disable ... |
1501 |
preempt_enable(); |
de31c3ca8 jump label: Fix e... |
1502 |
jump_label_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1503 |
|
f7fa6ef0d kprobes: cleanup ... |
1504 1505 |
return ret; } |
55479f647 kprobes: Allow pr... |
1506 |
int register_kprobe(struct kprobe *p) |
f7fa6ef0d kprobes: cleanup ... |
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 |
{ 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: ... |
1525 |
p->nmissed = 0; |
9861668f7 kprobes: add (un)... |
1526 |
INIT_LIST_HEAD(&p->list); |
afd66255b kprobes: Introduc... |
1527 |
|
f7fa6ef0d kprobes: cleanup ... |
1528 1529 1530 1531 1532 |
ret = check_kprobe_address_safe(p, &probed_mod); if (ret) return ret; mutex_lock(&kprobe_mutex); |
afd66255b kprobes: Introduc... |
1533 |
|
64f562c6d [PATCH] kprobes: ... |
1534 1535 |
old_p = get_kprobe(p->addr); if (old_p) { |
afd66255b kprobes: Introduc... |
1536 |
/* Since this may unoptimize old_p, locking text_mutex. */ |
64f562c6d [PATCH] kprobes: ... |
1537 |
ret = register_aggr_kprobe(old_p, p); |
1da177e4c Linux-2.6.12-rc2 |
1538 1539 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
1540 |
|
2d1e38f56 kprobes: Cure hot... |
1541 1542 1543 |
cpus_read_lock(); /* Prevent text modification */ mutex_lock(&text_mutex); |
ae6aa16fd kprobes: introduc... |
1544 |
ret = prepare_kprobe(p); |
25764288d kprobes: Move loc... |
1545 |
mutex_unlock(&text_mutex); |
2d1e38f56 kprobes: Cure hot... |
1546 |
cpus_read_unlock(); |
6f716acd5 kprobes: codingst... |
1547 |
if (ret) |
afd66255b kprobes: Introduc... |
1548 |
goto out; |
49a2a1b83 [PATCH] kprobes: ... |
1549 |
|
64f562c6d [PATCH] kprobes: ... |
1550 |
INIT_HLIST_NODE(&p->hlist); |
3516a4604 [PATCH] Kprobes: ... |
1551 |
hlist_add_head_rcu(&p->hlist, |
1da177e4c Linux-2.6.12-rc2 |
1552 |
&kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]); |
12310e343 kprobes: Propagat... |
1553 1554 1555 1556 |
if (!kprobes_all_disarmed && !kprobe_disabled(p)) { ret = arm_kprobe(p); if (ret) { hlist_del_rcu(&p->hlist); |
ae8b7ce76 kprobes: Replace ... |
1557 |
synchronize_rcu(); |
12310e343 kprobes: Propagat... |
1558 1559 1560 |
goto out; } } |
afd66255b kprobes: Introduc... |
1561 1562 1563 |
/* Try to optimize kprobe */ try_to_optimize_kprobe(p); |
1da177e4c Linux-2.6.12-rc2 |
1564 |
out: |
7a7d1cf95 [PATCH] sem2mutex... |
1565 |
mutex_unlock(&kprobe_mutex); |
49a2a1b83 [PATCH] kprobes: ... |
1566 |
|
e8386a0cb kprobes: support ... |
1567 |
if (probed_mod) |
df019b1d8 [PATCH] kprobes: ... |
1568 |
module_put(probed_mod); |
e8386a0cb kprobes: support ... |
1569 |
|
1da177e4c Linux-2.6.12-rc2 |
1570 1571 |
return ret; } |
99081ab55 kprobes: move EXP... |
1572 |
EXPORT_SYMBOL_GPL(register_kprobe); |
1da177e4c Linux-2.6.12-rc2 |
1573 |
|
6f0f1dd71 kprobes: Cleanup ... |
1574 |
/* Check if all probes on the aggrprobe are disabled */ |
55479f647 kprobes: Allow pr... |
1575 |
static int aggr_kprobe_disabled(struct kprobe *ap) |
6f0f1dd71 kprobes: Cleanup ... |
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 |
{ struct kprobe *kp; list_for_each_entry_rcu(kp, &ap->list, list) if (!kprobe_disabled(kp)) /* * There is an active probe on the list. * We can't disable this ap. */ return 0; return 1; } /* Disable one kprobe: Make sure called under kprobe_mutex is locked */ |
55479f647 kprobes: Allow pr... |
1591 |
static struct kprobe *__disable_kprobe(struct kprobe *p) |
6f0f1dd71 kprobes: Cleanup ... |
1592 1593 |
{ struct kprobe *orig_p; |
297f9233b kprobes: Propagat... |
1594 |
int ret; |
6f0f1dd71 kprobes: Cleanup ... |
1595 1596 1597 1598 |
/* Get an original kprobe for return */ orig_p = __get_valid_kprobe(p); if (unlikely(orig_p == NULL)) |
297f9233b kprobes: Propagat... |
1599 |
return ERR_PTR(-EINVAL); |
6f0f1dd71 kprobes: Cleanup ... |
1600 1601 1602 1603 1604 1605 1606 1607 |
if (!kprobe_disabled(p)) { /* Disable probe if it is a child probe */ if (p != orig_p) p->flags |= KPROBE_FLAG_DISABLED; /* Try to disarm and disable this/parent probe */ if (p == orig_p || aggr_kprobe_disabled(orig_p)) { |
69d54b916 kprobes: makes kp... |
1608 1609 1610 1611 1612 |
/* * If kprobes_all_disarmed is set, orig_p * should have already been disarmed, so * skip unneed disarming process. */ |
297f9233b kprobes: Propagat... |
1613 1614 1615 1616 1617 1618 1619 |
if (!kprobes_all_disarmed) { ret = disarm_kprobe(orig_p, true); if (ret) { p->flags &= ~KPROBE_FLAG_DISABLED; return ERR_PTR(ret); } } |
6f0f1dd71 kprobes: Cleanup ... |
1620 1621 1622 1623 1624 1625 |
orig_p->flags |= KPROBE_FLAG_DISABLED; } } return orig_p; } |
de5bd88d5 kprobes: support ... |
1626 1627 1628 |
/* * Unregister a kprobe without a scheduler synchronization. */ |
55479f647 kprobes: Allow pr... |
1629 |
static int __unregister_kprobe_top(struct kprobe *p) |
de5bd88d5 kprobes: support ... |
1630 |
{ |
6d8e40a85 kprobes: Rename o... |
1631 |
struct kprobe *ap, *list_p; |
de5bd88d5 kprobes: support ... |
1632 |
|
6f0f1dd71 kprobes: Cleanup ... |
1633 1634 |
/* Disable kprobe. This will disarm it if needed. */ ap = __disable_kprobe(p); |
297f9233b kprobes: Propagat... |
1635 1636 |
if (IS_ERR(ap)) return PTR_ERR(ap); |
de5bd88d5 kprobes: support ... |
1637 |
|
6f0f1dd71 kprobes: Cleanup ... |
1638 |
if (ap == p) |
bf8f6e5b3 Kprobes: The ON/O... |
1639 |
/* |
6f0f1dd71 kprobes: Cleanup ... |
1640 1641 |
* This probe is an independent(and non-optimized) kprobe * (not an aggrprobe). Remove from the hash list. |
bf8f6e5b3 Kprobes: The ON/O... |
1642 |
*/ |
6f0f1dd71 kprobes: Cleanup ... |
1643 1644 1645 1646 |
goto disarmed; /* Following process expects this probe is an aggrprobe */ WARN_ON(!kprobe_aggrprobe(ap)); |
6274de498 kprobes: Support ... |
1647 1648 1649 1650 1651 |
if (list_is_singular(&ap->list) && kprobe_disarmed(ap)) /* * !disarmed could be happen if the probe is under delayed * unoptimizing. */ |
6f0f1dd71 kprobes: Cleanup ... |
1652 1653 1654 |
goto disarmed; else { /* If disabling probe has special handlers, update aggrprobe */ |
e8386a0cb kprobes: support ... |
1655 |
if (p->post_handler && !kprobe_gone(p)) { |
6d8e40a85 kprobes: Rename o... |
1656 |
list_for_each_entry_rcu(list_p, &ap->list, list) { |
9861668f7 kprobes: add (un)... |
1657 1658 1659 |
if ((list_p != p) && (list_p->post_handler)) goto noclean; } |
6d8e40a85 kprobes: Rename o... |
1660 |
ap->post_handler = NULL; |
9861668f7 kprobes: add (un)... |
1661 1662 |
} noclean: |
6f0f1dd71 kprobes: Cleanup ... |
1663 1664 1665 1666 |
/* * Remove from the aggrprobe: this path will do nothing in * __unregister_kprobe_bottom(). */ |
49a2a1b83 [PATCH] kprobes: ... |
1667 |
list_del_rcu(&p->list); |
6f0f1dd71 kprobes: Cleanup ... |
1668 1669 1670 1671 1672 1673 |
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: ... |
1674 |
} |
9861668f7 kprobes: add (un)... |
1675 |
return 0; |
6f0f1dd71 kprobes: Cleanup ... |
1676 1677 1678 1679 |
disarmed: hlist_del_rcu(&ap->hlist); return 0; |
9861668f7 kprobes: add (un)... |
1680 |
} |
3516a4604 [PATCH] Kprobes: ... |
1681 |
|
55479f647 kprobes: Allow pr... |
1682 |
static void __unregister_kprobe_bottom(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1683 |
{ |
6d8e40a85 kprobes: Rename o... |
1684 |
struct kprobe *ap; |
b3e55c727 [PATCH] Kprobes: ... |
1685 |
|
e8386a0cb kprobes: support ... |
1686 |
if (list_empty(&p->list)) |
6274de498 kprobes: Support ... |
1687 |
/* This is an independent kprobe */ |
0498b6350 [PATCH] kprobes: ... |
1688 |
arch_remove_kprobe(p); |
e8386a0cb kprobes: support ... |
1689 |
else if (list_is_singular(&p->list)) { |
6274de498 kprobes: Support ... |
1690 |
/* This is the last child of an aggrprobe */ |
6d8e40a85 kprobes: Rename o... |
1691 |
ap = list_entry(p->list.next, struct kprobe, list); |
e8386a0cb kprobes: support ... |
1692 |
list_del(&p->list); |
6d8e40a85 kprobes: Rename o... |
1693 |
free_aggr_kprobe(ap); |
9861668f7 kprobes: add (un)... |
1694 |
} |
6274de498 kprobes: Support ... |
1695 |
/* Otherwise, do nothing. */ |
9861668f7 kprobes: add (un)... |
1696 |
} |
55479f647 kprobes: Allow pr... |
1697 |
int register_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1698 1699 1700 1701 1702 1703 |
{ int i, ret = 0; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1704 |
ret = register_kprobe(kps[i]); |
67dddaad5 kprobes: fix erro... |
1705 1706 1707 |
if (ret < 0) { if (i > 0) unregister_kprobes(kps, i); |
9861668f7 kprobes: add (un)... |
1708 |
break; |
367216567 [PATCH] Kprobe: m... |
1709 |
} |
49a2a1b83 [PATCH] kprobes: ... |
1710 |
} |
9861668f7 kprobes: add (un)... |
1711 1712 |
return ret; } |
99081ab55 kprobes: move EXP... |
1713 |
EXPORT_SYMBOL_GPL(register_kprobes); |
9861668f7 kprobes: add (un)... |
1714 |
|
55479f647 kprobes: Allow pr... |
1715 |
void unregister_kprobe(struct kprobe *p) |
9861668f7 kprobes: add (un)... |
1716 1717 1718 |
{ unregister_kprobes(&p, 1); } |
99081ab55 kprobes: move EXP... |
1719 |
EXPORT_SYMBOL_GPL(unregister_kprobe); |
9861668f7 kprobes: add (un)... |
1720 |
|
55479f647 kprobes: Allow pr... |
1721 |
void unregister_kprobes(struct kprobe **kps, int num) |
9861668f7 kprobes: add (un)... |
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 |
{ int i; if (num <= 0) return; mutex_lock(&kprobe_mutex); for (i = 0; i < num; i++) if (__unregister_kprobe_top(kps[i]) < 0) kps[i]->addr = NULL; mutex_unlock(&kprobe_mutex); |
ae8b7ce76 kprobes: Replace ... |
1732 |
synchronize_rcu(); |
9861668f7 kprobes: add (un)... |
1733 1734 1735 |
for (i = 0; i < num; i++) if (kps[i]->addr) __unregister_kprobe_bottom(kps[i]); |
1da177e4c Linux-2.6.12-rc2 |
1736 |
} |
99081ab55 kprobes: move EXP... |
1737 |
EXPORT_SYMBOL_GPL(unregister_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
1738 |
|
5f6bee347 kprobes: Convert ... |
1739 1740 |
int __weak kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data) |
fc62d0207 kprobes: Introduc... |
1741 1742 1743 |
{ return NOTIFY_DONE; } |
5f6bee347 kprobes: Convert ... |
1744 |
NOKPROBE_SYMBOL(kprobe_exceptions_notify); |
fc62d0207 kprobes: Introduc... |
1745 |
|
1da177e4c Linux-2.6.12-rc2 |
1746 1747 |
static struct notifier_block kprobe_exceptions_nb = { .notifier_call = kprobe_exceptions_notify, |
3d5631e06 [PATCH] Kprobes r... |
1748 1749 |
.priority = 0x7fffffff /* we need to be notified first */ }; |
3d7e33825 jprobes: make jpr... |
1750 1751 1752 1753 |
unsigned long __weak arch_deref_entry_point(void *entry) { return (unsigned long)entry; } |
1da177e4c Linux-2.6.12-rc2 |
1754 |
|
9edddaa20 Kprobes: indicate... |
1755 |
#ifdef CONFIG_KRETPROBES |
e65cefe87 [PATCH] kernel/kp... |
1756 1757 1758 1759 |
/* * This kprobe pre_handler is registered with every kretprobe. When probe * hits it will set up the return probe. */ |
820aede02 kprobes: Use NOKP... |
1760 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
e65cefe87 [PATCH] kernel/kp... |
1761 1762 |
{ struct kretprobe *rp = container_of(p, struct kretprobe, kp); |
ef53d9c5e kprobes: improve ... |
1763 1764 |
unsigned long hash, flags = 0; struct kretprobe_instance *ri; |
e65cefe87 [PATCH] kernel/kp... |
1765 |
|
f96f56780 kprobes: Skip kre... |
1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 |
/* * To avoid deadlocks, prohibit return probing in NMI contexts, * just skip the probe and increase the (inexact) 'nmissed' * statistical counter, so that the user is informed that * something happened: */ if (unlikely(in_nmi())) { rp->nmissed++; return 0; } /* TODO: consider to only swap the RA after the last pre_handler fired */ |
ef53d9c5e kprobes: improve ... |
1778 |
hash = hash_ptr(current, KPROBE_HASH_BITS); |
ec484608c locking, kprobes:... |
1779 |
raw_spin_lock_irqsave(&rp->lock, flags); |
4c4308cb9 kprobes: kretprob... |
1780 |
if (!hlist_empty(&rp->free_instances)) { |
4c4308cb9 kprobes: kretprob... |
1781 |
ri = hlist_entry(rp->free_instances.first, |
ef53d9c5e kprobes: improve ... |
1782 1783 |
struct kretprobe_instance, hlist); hlist_del(&ri->hlist); |
ec484608c locking, kprobes:... |
1784 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1785 |
|
4c4308cb9 kprobes: kretprob... |
1786 1787 |
ri->rp = rp; ri->task = current; |
f47cd9b55 kprobes: kretprob... |
1788 |
|
55ca6140e kprobes: fix a me... |
1789 1790 1791 1792 |
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... |
1793 |
return 0; |
55ca6140e kprobes: fix a me... |
1794 |
} |
f47cd9b55 kprobes: kretprob... |
1795 |
|
4c4308cb9 kprobes: kretprob... |
1796 1797 1798 |
arch_prepare_kretprobe(ri, regs); /* XXX(hch): why is there no hlist_move_head? */ |
ef53d9c5e kprobes: improve ... |
1799 1800 1801 1802 1803 |
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... |
1804 |
rp->nmissed++; |
ec484608c locking, kprobes:... |
1805 |
raw_spin_unlock_irqrestore(&rp->lock, flags); |
ef53d9c5e kprobes: improve ... |
1806 |
} |
e65cefe87 [PATCH] kernel/kp... |
1807 1808 |
return 0; } |
820aede02 kprobes: Use NOKP... |
1809 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
e65cefe87 [PATCH] kernel/kp... |
1810 |
|
659b957f2 kprobes: Rename [... |
1811 |
bool __weak arch_kprobe_on_func_entry(unsigned long offset) |
90ec5e89e kretprobes: Ensur... |
1812 1813 1814 |
{ return !offset; } |
659b957f2 kprobes: Rename [... |
1815 |
bool kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset) |
1d585e709 trace/kprobes: Fi... |
1816 1817 1818 1819 1820 1821 1822 |
{ kprobe_opcode_t *kp_addr = _kprobe_addr(addr, sym, offset); if (IS_ERR(kp_addr)) return false; if (!kallsyms_lookup_size_offset((unsigned long)kp_addr, NULL, &offset) || |
659b957f2 kprobes: Rename [... |
1823 |
!arch_kprobe_on_func_entry(offset)) |
1d585e709 trace/kprobes: Fi... |
1824 1825 1826 1827 |
return false; return true; } |
55479f647 kprobes: Allow pr... |
1828 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1829 1830 1831 1832 |
{ int ret = 0; struct kretprobe_instance *inst; int i; |
b2a5cd693 kprobes: fix a nu... |
1833 |
void *addr; |
90ec5e89e kretprobes: Ensur... |
1834 |
|
659b957f2 kprobes: Rename [... |
1835 |
if (!kprobe_on_func_entry(rp->kp.addr, rp->kp.symbol_name, rp->kp.offset)) |
90ec5e89e kretprobes: Ensur... |
1836 |
return -EINVAL; |
f438d914b kprobes: support ... |
1837 1838 |
if (kretprobe_blacklist_size) { |
b2a5cd693 kprobes: fix a nu... |
1839 |
addr = kprobe_addr(&rp->kp); |
bc81d48d1 kprobes: Return -... |
1840 1841 |
if (IS_ERR(addr)) return PTR_ERR(addr); |
f438d914b kprobes: support ... |
1842 1843 1844 1845 1846 1847 |
for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { if (kretprobe_blacklist[i].addr == addr) return -EINVAL; } } |
b94cce926 [PATCH] kprobes: ... |
1848 1849 |
rp->kp.pre_handler = pre_handler_kretprobe; |
7522a8423 [PATCH] kprobes: ... |
1850 1851 |
rp->kp.post_handler = NULL; rp->kp.fault_handler = NULL; |
b94cce926 [PATCH] kprobes: ... |
1852 1853 1854 |
/* Pre-allocate memory for max kretprobe instances */ if (rp->maxactive <= 0) { |
926166063 kprobes: Use CONF... |
1855 |
#ifdef CONFIG_PREEMPTION |
c2ef6661c kprobes: Fix dist... |
1856 |
rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus()); |
b94cce926 [PATCH] kprobes: ... |
1857 |
#else |
4dae560f9 kprobes: Sanitize... |
1858 |
rp->maxactive = num_possible_cpus(); |
b94cce926 [PATCH] kprobes: ... |
1859 1860 |
#endif } |
ec484608c locking, kprobes:... |
1861 |
raw_spin_lock_init(&rp->lock); |
b94cce926 [PATCH] kprobes: ... |
1862 1863 |
INIT_HLIST_HEAD(&rp->free_instances); for (i = 0; i < rp->maxactive; i++) { |
f47cd9b55 kprobes: kretprob... |
1864 1865 |
inst = kmalloc(sizeof(struct kretprobe_instance) + rp->data_size, GFP_KERNEL); |
b94cce926 [PATCH] kprobes: ... |
1866 1867 1868 1869 |
if (inst == NULL) { free_rp_inst(rp); return -ENOMEM; } |
ef53d9c5e kprobes: improve ... |
1870 1871 |
INIT_HLIST_NODE(&inst->hlist); hlist_add_head(&inst->hlist, &rp->free_instances); |
b94cce926 [PATCH] kprobes: ... |
1872 1873 1874 1875 |
} rp->nmissed = 0; /* Establish function entry probe point */ |
49ad2fd76 kprobes: remove c... |
1876 |
ret = register_kprobe(&rp->kp); |
4a296e07c kprobes: add (un)... |
1877 |
if (ret != 0) |
b94cce926 [PATCH] kprobes: ... |
1878 1879 1880 |
free_rp_inst(rp); return ret; } |
99081ab55 kprobes: move EXP... |
1881 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1882 |
|
55479f647 kprobes: Allow pr... |
1883 |
int register_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1884 1885 1886 1887 1888 1889 |
{ int ret = 0, i; if (num <= 0) return -EINVAL; for (i = 0; i < num; i++) { |
49ad2fd76 kprobes: remove c... |
1890 |
ret = register_kretprobe(rps[i]); |
67dddaad5 kprobes: fix erro... |
1891 1892 1893 |
if (ret < 0) { if (i > 0) unregister_kretprobes(rps, i); |
4a296e07c kprobes: add (un)... |
1894 1895 1896 1897 1898 |
break; } } return ret; } |
99081ab55 kprobes: move EXP... |
1899 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
4a296e07c kprobes: add (un)... |
1900 |
|
55479f647 kprobes: Allow pr... |
1901 |
void unregister_kretprobe(struct kretprobe *rp) |
4a296e07c kprobes: add (un)... |
1902 1903 1904 |
{ unregister_kretprobes(&rp, 1); } |
99081ab55 kprobes: move EXP... |
1905 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
4a296e07c kprobes: add (un)... |
1906 |
|
55479f647 kprobes: Allow pr... |
1907 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 |
{ int i; if (num <= 0) return; mutex_lock(&kprobe_mutex); for (i = 0; i < num; i++) if (__unregister_kprobe_top(&rps[i]->kp) < 0) rps[i]->kp.addr = NULL; mutex_unlock(&kprobe_mutex); |
ae8b7ce76 kprobes: Replace ... |
1918 |
synchronize_rcu(); |
4a296e07c kprobes: add (un)... |
1919 1920 1921 1922 1923 1924 1925 |
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... |
1926 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4a296e07c kprobes: add (un)... |
1927 |
|
9edddaa20 Kprobes: indicate... |
1928 |
#else /* CONFIG_KRETPROBES */ |
55479f647 kprobes: Allow pr... |
1929 |
int register_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1930 1931 1932 |
{ return -ENOSYS; } |
99081ab55 kprobes: move EXP... |
1933 |
EXPORT_SYMBOL_GPL(register_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1934 |
|
55479f647 kprobes: Allow pr... |
1935 |
int register_kretprobes(struct kretprobe **rps, int num) |
346fd59ba [PATCH] kprobes: ... |
1936 |
{ |
4a296e07c kprobes: add (un)... |
1937 |
return -ENOSYS; |
346fd59ba [PATCH] kprobes: ... |
1938 |
} |
99081ab55 kprobes: move EXP... |
1939 |
EXPORT_SYMBOL_GPL(register_kretprobes); |
55479f647 kprobes: Allow pr... |
1940 |
void unregister_kretprobe(struct kretprobe *rp) |
b94cce926 [PATCH] kprobes: ... |
1941 |
{ |
4a296e07c kprobes: add (un)... |
1942 |
} |
99081ab55 kprobes: move EXP... |
1943 |
EXPORT_SYMBOL_GPL(unregister_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1944 |
|
55479f647 kprobes: Allow pr... |
1945 |
void unregister_kretprobes(struct kretprobe **rps, int num) |
4a296e07c kprobes: add (un)... |
1946 1947 |
{ } |
99081ab55 kprobes: move EXP... |
1948 |
EXPORT_SYMBOL_GPL(unregister_kretprobes); |
4c4308cb9 kprobes: kretprob... |
1949 |
|
820aede02 kprobes: Use NOKP... |
1950 |
static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) |
4a296e07c kprobes: add (un)... |
1951 1952 |
{ return 0; |
b94cce926 [PATCH] kprobes: ... |
1953 |
} |
820aede02 kprobes: Use NOKP... |
1954 |
NOKPROBE_SYMBOL(pre_handler_kretprobe); |
b94cce926 [PATCH] kprobes: ... |
1955 |
|
4a296e07c kprobes: add (un)... |
1956 |
#endif /* CONFIG_KRETPROBES */ |
e8386a0cb kprobes: support ... |
1957 |
/* Set the kprobe gone and remove its instruction buffer. */ |
55479f647 kprobes: Allow pr... |
1958 |
static void kill_kprobe(struct kprobe *p) |
e8386a0cb kprobes: support ... |
1959 1960 |
{ struct kprobe *kp; |
de5bd88d5 kprobes: support ... |
1961 |
|
e8386a0cb kprobes: support ... |
1962 |
p->flags |= KPROBE_FLAG_GONE; |
afd66255b kprobes: Introduc... |
1963 |
if (kprobe_aggrprobe(p)) { |
e8386a0cb kprobes: support ... |
1964 1965 1966 1967 1968 1969 1970 |
/* * If this is an aggr_kprobe, we have to list all the * chained probes and mark them GONE. */ list_for_each_entry_rcu(kp, &p->list, list) kp->flags |= KPROBE_FLAG_GONE; p->post_handler = NULL; |
afd66255b kprobes: Introduc... |
1971 |
kill_optimized_kprobe(p); |
e8386a0cb kprobes: support ... |
1972 1973 1974 1975 1976 1977 1978 |
} /* * 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... |
1979 |
/* Disable one kprobe */ |
55479f647 kprobes: Allow pr... |
1980 |
int disable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
1981 1982 |
{ int ret = 0; |
297f9233b kprobes: Propagat... |
1983 |
struct kprobe *p; |
c0614829c kprobes: Move ena... |
1984 1985 |
mutex_lock(&kprobe_mutex); |
6f0f1dd71 kprobes: Cleanup ... |
1986 |
/* Disable this kprobe */ |
297f9233b kprobes: Propagat... |
1987 1988 1989 |
p = __disable_kprobe(kp); if (IS_ERR(p)) ret = PTR_ERR(p); |
c0614829c kprobes: Move ena... |
1990 |
|
c0614829c kprobes: Move ena... |
1991 1992 1993 1994 1995 1996 |
mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(disable_kprobe); /* Enable one kprobe */ |
55479f647 kprobes: Allow pr... |
1997 |
int enable_kprobe(struct kprobe *kp) |
c0614829c kprobes: Move ena... |
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 |
{ int ret = 0; struct kprobe *p; mutex_lock(&kprobe_mutex); /* Check whether specified probe is valid. */ p = __get_valid_kprobe(kp); if (unlikely(p == NULL)) { ret = -EINVAL; goto out; } if (kprobe_gone(kp)) { /* This kprobe has gone, we couldn't enable it. */ ret = -EINVAL; goto out; } if (p != kp) kp->flags &= ~KPROBE_FLAG_DISABLED; if (!kprobes_all_disarmed && kprobe_disabled(p)) { p->flags &= ~KPROBE_FLAG_DISABLED; |
12310e343 kprobes: Propagat... |
2022 2023 2024 |
ret = arm_kprobe(p); if (ret) p->flags |= KPROBE_FLAG_DISABLED; |
c0614829c kprobes: Move ena... |
2025 2026 2027 2028 2029 2030 |
} out: mutex_unlock(&kprobe_mutex); return ret; } EXPORT_SYMBOL_GPL(enable_kprobe); |
4458515b2 kprobes: Replace ... |
2031 |
/* Caller must NOT call this in usual path. This is only for critical case */ |
820aede02 kprobes: Use NOKP... |
2032 |
void dump_kprobe(struct kprobe *kp) |
24851d244 tracing/kprobes: ... |
2033 |
{ |
4458515b2 kprobes: Replace ... |
2034 2035 2036 2037 2038 2039 2040 |
pr_err("Dumping kprobe: "); pr_err("Name: %s Offset: %x Address: %pS ", kp->symbol_name, kp->offset, kp->addr); |
24851d244 tracing/kprobes: ... |
2041 |
} |
820aede02 kprobes: Use NOKP... |
2042 |
NOKPROBE_SYMBOL(dump_kprobe); |
24851d244 tracing/kprobes: ... |
2043 |
|
fb1a59fae kprobes: Blacklis... |
2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 |
int kprobe_add_ksym_blacklist(unsigned long entry) { struct kprobe_blacklist_entry *ent; unsigned long offset = 0, size = 0; if (!kernel_text_address(entry) || !kallsyms_lookup_size_offset(entry, &size, &offset)) return -EINVAL; ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; ent->start_addr = entry; ent->end_addr = entry + size; INIT_LIST_HEAD(&ent->list); list_add_tail(&ent->list, &kprobe_blacklist); return (int)size; } /* Add all symbols in given area into kprobe blacklist */ int kprobe_add_area_blacklist(unsigned long start, unsigned long end) { unsigned long entry; int ret = 0; for (entry = start; entry < end; entry += ret) { ret = kprobe_add_ksym_blacklist(entry); if (ret < 0) return ret; if (ret == 0) /* In case of alias symbol */ ret = 1; } return 0; } int __init __weak arch_populate_kprobe_blacklist(void) { return 0; } |
376e24242 kprobes: Introduc... |
2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 |
/* * Lookup and populate the kprobe_blacklist. * * Unlike the kretprobe blacklist, we'll need to determine * the range of addresses that belong to the said functions, * since a kprobe need not necessarily be at the beginning * of a function. */ static int __init populate_kprobe_blacklist(unsigned long *start, unsigned long *end) { |
fb1a59fae kprobes: Blacklis... |
2095 |
unsigned long entry; |
376e24242 kprobes: Introduc... |
2096 |
unsigned long *iter; |
fb1a59fae kprobes: Blacklis... |
2097 |
int ret; |
376e24242 kprobes: Introduc... |
2098 2099 |
for (iter = start; iter < end; iter++) { |
d81b4253b kprobes: Fix "Fai... |
2100 |
entry = arch_deref_entry_point((void *)*iter); |
fb1a59fae kprobes: Blacklis... |
2101 2102 |
ret = kprobe_add_ksym_blacklist(entry); if (ret == -EINVAL) |
376e24242 kprobes: Introduc... |
2103 |
continue; |
fb1a59fae kprobes: Blacklis... |
2104 2105 |
if (ret < 0) return ret; |
376e24242 kprobes: Introduc... |
2106 |
} |
fb1a59fae kprobes: Blacklis... |
2107 2108 2109 2110 2111 2112 |
/* Symbols in __kprobes_text are blacklisted */ ret = kprobe_add_area_blacklist((unsigned long)__kprobes_text_start, (unsigned long)__kprobes_text_end); return ret ? : arch_populate_kprobe_blacklist(); |
376e24242 kprobes: Introduc... |
2113 |
} |
e8386a0cb kprobes: support ... |
2114 |
/* Module notifier call back, checking kprobes on the module */ |
55479f647 kprobes: Allow pr... |
2115 2116 |
static int kprobes_module_callback(struct notifier_block *nb, unsigned long val, void *data) |
e8386a0cb kprobes: support ... |
2117 2118 2119 |
{ struct module *mod = data; struct hlist_head *head; |
e8386a0cb kprobes: support ... |
2120 2121 |
struct kprobe *p; unsigned int i; |
f24659d96 kprobes: support ... |
2122 |
int checkcore = (val == MODULE_STATE_GOING); |
e8386a0cb kprobes: support ... |
2123 |
|
f24659d96 kprobes: support ... |
2124 |
if (val != MODULE_STATE_GOING && val != MODULE_STATE_LIVE) |
e8386a0cb kprobes: support ... |
2125 2126 2127 |
return NOTIFY_DONE; /* |
f24659d96 kprobes: support ... |
2128 2129 2130 2131 |
* 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 ... |
2132 2133 2134 2135 |
*/ mutex_lock(&kprobe_mutex); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
b67bfe0d4 hlist: drop the n... |
2136 |
hlist_for_each_entry_rcu(p, head, hlist) |
f24659d96 kprobes: support ... |
2137 2138 2139 |
if (within_module_init((unsigned long)p->addr, mod) || (checkcore && within_module_core((unsigned long)p->addr, mod))) { |
e8386a0cb kprobes: support ... |
2140 2141 2142 2143 |
/* * The vaddr this probe is installed will soon * be vfreed buy not synced to disk. Hence, * disarming the breakpoint isn't needed. |
545a02819 kprobes: Document... |
2144 2145 2146 2147 2148 2149 |
* * Note, this will also move any optimized probes * that are pending to be removed from their * corresponding lists to the freeing_list and * will not be touched by the delayed * kprobe_optimizer work handler. |
e8386a0cb kprobes: support ... |
2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 |
*/ kill_kprobe(p); } } mutex_unlock(&kprobe_mutex); return NOTIFY_DONE; } static struct notifier_block kprobe_module_nb = { .notifier_call = kprobes_module_callback, .priority = 0 }; |
376e24242 kprobes: Introduc... |
2162 2163 2164 |
/* Markers of _kprobe_blacklist section */ extern unsigned long __start_kprobe_blacklist[]; extern unsigned long __stop_kprobe_blacklist[]; |
1da177e4c Linux-2.6.12-rc2 |
2165 2166 2167 2168 2169 2170 |
static int __init init_kprobes(void) { int i, err = 0; /* FIXME allocate the probe table, currently defined statically */ /* initialize all list heads */ |
b94cce926 [PATCH] kprobes: ... |
2171 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { |
1da177e4c Linux-2.6.12-rc2 |
2172 |
INIT_HLIST_HEAD(&kprobe_table[i]); |
b94cce926 [PATCH] kprobes: ... |
2173 |
INIT_HLIST_HEAD(&kretprobe_inst_table[i]); |
ec484608c locking, kprobes:... |
2174 |
raw_spin_lock_init(&(kretprobe_table_locks[i].lock)); |
b94cce926 [PATCH] kprobes: ... |
2175 |
} |
1da177e4c Linux-2.6.12-rc2 |
2176 |
|
376e24242 kprobes: Introduc... |
2177 2178 2179 2180 2181 2182 2183 |
err = populate_kprobe_blacklist(__start_kprobe_blacklist, __stop_kprobe_blacklist); if (err) { pr_err("kprobes: failed to populate blacklist: %d ", err); pr_err("Please take care of using kprobes. "); |
3d8d996e0 kprobes: prevent ... |
2184 |
} |
f438d914b kprobes: support ... |
2185 2186 2187 |
if (kretprobe_blacklist_size) { /* lookup the function address from its name */ for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { |
49e0b4658 kprobes: Convert ... |
2188 |
kretprobe_blacklist[i].addr = |
290e30707 powerpc/kprobes: ... |
2189 |
kprobe_lookup_name(kretprobe_blacklist[i].name, 0); |
f438d914b kprobes: support ... |
2190 2191 2192 2193 2194 2195 |
if (!kretprobe_blacklist[i].addr) printk("kretprobe: lookup failed: %s ", kretprobe_blacklist[i].name); } } |
b2be84df9 kprobes: Jump opt... |
2196 2197 |
#if defined(CONFIG_OPTPROBES) #if defined(__ARCH_WANT_KPROBES_INSN_SLOT) |
afd66255b kprobes: Introduc... |
2198 2199 2200 |
/* Init kprobe_optinsn_slots */ kprobe_optinsn_slots.insn_size = MAX_OPTINSN_SIZE; #endif |
b2be84df9 kprobes: Jump opt... |
2201 2202 2203 |
/* By default, kprobes can be optimized */ kprobes_allow_optimization = true; #endif |
afd66255b kprobes: Introduc... |
2204 |
|
e579abeb5 kprobes: rename k... |
2205 2206 |
/* By default, kprobes are armed */ kprobes_all_disarmed = false; |
bf8f6e5b3 Kprobes: The ON/O... |
2207 |
|
6772926be [PATCH] kprobes: ... |
2208 |
err = arch_init_kprobes(); |
802eae7c8 [PATCH] Return pr... |
2209 2210 |
if (!err) err = register_die_notifier(&kprobe_exceptions_nb); |
e8386a0cb kprobes: support ... |
2211 2212 |
if (!err) err = register_module_notifier(&kprobe_module_nb); |
ef53d9c5e kprobes: improve ... |
2213 |
kprobes_initialized = (err == 0); |
802eae7c8 [PATCH] Return pr... |
2214 |
|
8c1c93564 x86: kprobes: add... |
2215 2216 |
if (!err) init_test_probes(); |
1da177e4c Linux-2.6.12-rc2 |
2217 2218 |
return err; } |
65fc965c7 kprobes: Fix to i... |
2219 |
subsys_initcall(init_kprobes); |
1da177e4c Linux-2.6.12-rc2 |
2220 |
|
346fd59ba [PATCH] kprobes: ... |
2221 |
#ifdef CONFIG_DEBUG_FS |
55479f647 kprobes: Allow pr... |
2222 |
static void report_probe(struct seq_file *pi, struct kprobe *p, |
afd66255b kprobes: Introduc... |
2223 |
const char *sym, int offset, char *modname, struct kprobe *pp) |
346fd59ba [PATCH] kprobes: ... |
2224 2225 |
{ char *kprobe_type; |
81365a947 kprobes: Show add... |
2226 |
void *addr = p->addr; |
346fd59ba [PATCH] kprobes: ... |
2227 2228 2229 |
if (p->pre_handler == pre_handler_kretprobe) kprobe_type = "r"; |
346fd59ba [PATCH] kprobes: ... |
2230 2231 |
else kprobe_type = "k"; |
afd66255b kprobes: Introduc... |
2232 |
|
81365a947 kprobes: Show add... |
2233 2234 |
if (!kallsyms_show_value()) addr = NULL; |
346fd59ba [PATCH] kprobes: ... |
2235 |
if (sym) |
81365a947 kprobes: Show add... |
2236 2237 |
seq_printf(pi, "%px %s %s+0x%x %s ", addr, kprobe_type, sym, offset, |
afd66255b kprobes: Introduc... |
2238 |
(modname ? modname : " ")); |
81365a947 kprobes: Show add... |
2239 2240 2241 |
else /* try to use %pS */ seq_printf(pi, "%px %s %pS ", addr, kprobe_type, p->addr); |
afd66255b kprobes: Introduc... |
2242 2243 2244 |
if (!pp) pp = p; |
ae6aa16fd kprobes: introduc... |
2245 2246 |
seq_printf(pi, "%s%s%s%s ", |
afd66255b kprobes: Introduc... |
2247 2248 |
(kprobe_gone(p) ? "[GONE]" : ""), ((kprobe_disabled(p) && !kprobe_gone(p)) ? "[DISABLED]" : ""), |
ae6aa16fd kprobes: introduc... |
2249 2250 |
(kprobe_optimized(pp) ? "[OPTIMIZED]" : ""), (kprobe_ftrace(pp) ? "[FTRACE]" : "")); |
346fd59ba [PATCH] kprobes: ... |
2251 |
} |
55479f647 kprobes: Allow pr... |
2252 |
static void *kprobe_seq_start(struct seq_file *f, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2253 2254 2255 |
{ return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL; } |
55479f647 kprobes: Allow pr... |
2256 |
static void *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos) |
346fd59ba [PATCH] kprobes: ... |
2257 2258 2259 2260 2261 2262 |
{ (*pos)++; if (*pos >= KPROBE_TABLE_SIZE) return NULL; return pos; } |
55479f647 kprobes: Allow pr... |
2263 |
static void kprobe_seq_stop(struct seq_file *f, void *v) |
346fd59ba [PATCH] kprobes: ... |
2264 2265 2266 |
{ /* Nothing to do */ } |
55479f647 kprobes: Allow pr... |
2267 |
static int show_kprobe_addr(struct seq_file *pi, void *v) |
346fd59ba [PATCH] kprobes: ... |
2268 2269 |
{ struct hlist_head *head; |
346fd59ba [PATCH] kprobes: ... |
2270 2271 2272 |
struct kprobe *p, *kp; const char *sym = NULL; unsigned int i = *(loff_t *) v; |
ffb451227 Simplify kallsyms... |
2273 |
unsigned long offset = 0; |
ab7678656 kprobes: use KSYM... |
2274 |
char *modname, namebuf[KSYM_NAME_LEN]; |
346fd59ba [PATCH] kprobes: ... |
2275 2276 2277 |
head = &kprobe_table[i]; preempt_disable(); |
b67bfe0d4 hlist: drop the n... |
2278 |
hlist_for_each_entry_rcu(p, head, hlist) { |
ffb451227 Simplify kallsyms... |
2279 |
sym = kallsyms_lookup((unsigned long)p->addr, NULL, |
346fd59ba [PATCH] kprobes: ... |
2280 |
&offset, &modname, namebuf); |
afd66255b kprobes: Introduc... |
2281 |
if (kprobe_aggrprobe(p)) { |
346fd59ba [PATCH] kprobes: ... |
2282 |
list_for_each_entry_rcu(kp, &p->list, list) |
afd66255b kprobes: Introduc... |
2283 |
report_probe(pi, kp, sym, offset, modname, p); |
346fd59ba [PATCH] kprobes: ... |
2284 |
} else |
afd66255b kprobes: Introduc... |
2285 |
report_probe(pi, p, sym, offset, modname, NULL); |
346fd59ba [PATCH] kprobes: ... |
2286 2287 2288 2289 |
} preempt_enable(); return 0; } |
88e9d34c7 seq_file: constif... |
2290 |
static const struct seq_operations kprobes_seq_ops = { |
346fd59ba [PATCH] kprobes: ... |
2291 2292 2293 2294 2295 |
.start = kprobe_seq_start, .next = kprobe_seq_next, .stop = kprobe_seq_stop, .show = show_kprobe_addr }; |
55479f647 kprobes: Allow pr... |
2296 |
static int kprobes_open(struct inode *inode, struct file *filp) |
346fd59ba [PATCH] kprobes: ... |
2297 2298 2299 |
{ return seq_open(filp, &kprobes_seq_ops); } |
828c09509 const: constify r... |
2300 |
static const struct file_operations debugfs_kprobes_operations = { |
346fd59ba [PATCH] kprobes: ... |
2301 2302 2303 2304 2305 |
.open = kprobes_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
637247403 kprobes: Show bla... |
2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 |
/* kprobes/blacklist -- shows which functions can not be probed */ static void *kprobe_blacklist_seq_start(struct seq_file *m, loff_t *pos) { return seq_list_start(&kprobe_blacklist, *pos); } static void *kprobe_blacklist_seq_next(struct seq_file *m, void *v, loff_t *pos) { return seq_list_next(v, &kprobe_blacklist, pos); } static int kprobe_blacklist_seq_show(struct seq_file *m, void *v) { struct kprobe_blacklist_entry *ent = list_entry(v, struct kprobe_blacklist_entry, list); |
ffb9bd68e kprobes: Show bla... |
2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 |
/* * If /proc/kallsyms is not showing kernel address, we won't * show them here either. */ if (!kallsyms_show_value()) seq_printf(m, "0x%px-0x%px\t%ps ", NULL, NULL, (void *)ent->start_addr); else seq_printf(m, "0x%px-0x%px\t%ps ", (void *)ent->start_addr, (void *)ent->end_addr, (void *)ent->start_addr); |
637247403 kprobes: Show bla... |
2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 |
return 0; } static const struct seq_operations kprobe_blacklist_seq_ops = { .start = kprobe_blacklist_seq_start, .next = kprobe_blacklist_seq_next, .stop = kprobe_seq_stop, /* Reuse void function */ .show = kprobe_blacklist_seq_show, }; static int kprobe_blacklist_open(struct inode *inode, struct file *filp) { return seq_open(filp, &kprobe_blacklist_seq_ops); } static const struct file_operations debugfs_kprobe_blacklist_ops = { .open = kprobe_blacklist_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
12310e343 kprobes: Propagat... |
2354 |
static int arm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2355 2356 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2357 |
struct kprobe *p; |
12310e343 kprobes: Propagat... |
2358 2359 |
unsigned int i, total = 0, errors = 0; int err, ret = 0; |
bf8f6e5b3 Kprobes: The ON/O... |
2360 2361 |
mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2362 2363 |
/* If kprobes are armed, just return */ if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2364 |
goto already_enabled; |
977ad481b kprobes: set kpro... |
2365 2366 2367 2368 2369 2370 |
/* * optimize_kprobe() called by arm_kprobe() checks * kprobes_all_disarmed, so set kprobes_all_disarmed before * arm_kprobe. */ kprobes_all_disarmed = false; |
afd66255b kprobes: Introduc... |
2371 |
/* Arming kprobes doesn't optimize kprobe itself */ |
bf8f6e5b3 Kprobes: The ON/O... |
2372 2373 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
12310e343 kprobes: Propagat... |
2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 |
/* Arm all kprobes on a best-effort basis */ hlist_for_each_entry_rcu(p, head, hlist) { if (!kprobe_disabled(p)) { err = arm_kprobe(p); if (err) { errors++; ret = err; } total++; } } |
bf8f6e5b3 Kprobes: The ON/O... |
2385 |
} |
12310e343 kprobes: Propagat... |
2386 2387 2388 2389 2390 2391 2392 |
if (errors) pr_warn("Kprobes globally enabled, but failed to arm %d out of %d probes ", errors, total); else pr_info("Kprobes globally enabled "); |
bf8f6e5b3 Kprobes: The ON/O... |
2393 2394 2395 |
already_enabled: mutex_unlock(&kprobe_mutex); |
12310e343 kprobes: Propagat... |
2396 |
return ret; |
bf8f6e5b3 Kprobes: The ON/O... |
2397 |
} |
297f9233b kprobes: Propagat... |
2398 |
static int disarm_all_kprobes(void) |
bf8f6e5b3 Kprobes: The ON/O... |
2399 2400 |
{ struct hlist_head *head; |
bf8f6e5b3 Kprobes: The ON/O... |
2401 |
struct kprobe *p; |
297f9233b kprobes: Propagat... |
2402 2403 |
unsigned int i, total = 0, errors = 0; int err, ret = 0; |
bf8f6e5b3 Kprobes: The ON/O... |
2404 2405 |
mutex_lock(&kprobe_mutex); |
e579abeb5 kprobes: rename k... |
2406 |
/* If kprobes are already disarmed, just return */ |
6274de498 kprobes: Support ... |
2407 2408 |
if (kprobes_all_disarmed) { mutex_unlock(&kprobe_mutex); |
297f9233b kprobes: Propagat... |
2409 |
return 0; |
6274de498 kprobes: Support ... |
2410 |
} |
bf8f6e5b3 Kprobes: The ON/O... |
2411 |
|
e579abeb5 kprobes: rename k... |
2412 |
kprobes_all_disarmed = true; |
afd66255b kprobes: Introduc... |
2413 |
|
bf8f6e5b3 Kprobes: The ON/O... |
2414 2415 |
for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; |
297f9233b kprobes: Propagat... |
2416 |
/* Disarm all kprobes on a best-effort basis */ |
b67bfe0d4 hlist: drop the n... |
2417 |
hlist_for_each_entry_rcu(p, head, hlist) { |
297f9233b kprobes: Propagat... |
2418 2419 2420 2421 2422 2423 2424 2425 |
if (!arch_trampoline_kprobe(p) && !kprobe_disabled(p)) { err = disarm_kprobe(p, false); if (err) { errors++; ret = err; } total++; } |
bf8f6e5b3 Kprobes: The ON/O... |
2426 2427 |
} } |
297f9233b kprobes: Propagat... |
2428 2429 2430 2431 2432 2433 2434 2435 |
if (errors) pr_warn("Kprobes globally disabled, but failed to disarm %d out of %d probes ", errors, total); else pr_info("Kprobes globally disabled "); |
bf8f6e5b3 Kprobes: The ON/O... |
2436 |
mutex_unlock(&kprobe_mutex); |
bf8f6e5b3 Kprobes: The ON/O... |
2437 |
|
6274de498 kprobes: Support ... |
2438 2439 |
/* Wait for disarming all kprobes by optimizer */ wait_for_kprobe_optimizer(); |
297f9233b kprobes: Propagat... |
2440 2441 |
return ret; |
bf8f6e5b3 Kprobes: The ON/O... |
2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 |
} /* * 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... |
2453 |
if (!kprobes_all_disarmed) |
bf8f6e5b3 Kprobes: The ON/O... |
2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 |
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 ... |
2467 |
size_t buf_size; |
12310e343 kprobes: Propagat... |
2468 |
int ret = 0; |
bf8f6e5b3 Kprobes: The ON/O... |
2469 2470 2471 2472 |
buf_size = min(count, (sizeof(buf)-1)); if (copy_from_user(buf, user_buf, buf_size)) return -EFAULT; |
10fb46d5f kprobes: handle e... |
2473 |
buf[buf_size] = '\0'; |
bf8f6e5b3 Kprobes: The ON/O... |
2474 2475 2476 2477 |
switch (buf[0]) { case 'y': case 'Y': case '1': |
12310e343 kprobes: Propagat... |
2478 |
ret = arm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2479 2480 2481 2482 |
break; case 'n': case 'N': case '0': |
297f9233b kprobes: Propagat... |
2483 |
ret = disarm_all_kprobes(); |
bf8f6e5b3 Kprobes: The ON/O... |
2484 |
break; |
10fb46d5f kprobes: handle e... |
2485 2486 |
default: return -EINVAL; |
bf8f6e5b3 Kprobes: The ON/O... |
2487 |
} |
12310e343 kprobes: Propagat... |
2488 2489 |
if (ret) return ret; |
bf8f6e5b3 Kprobes: The ON/O... |
2490 2491 |
return count; } |
828c09509 const: constify r... |
2492 |
static const struct file_operations fops_kp = { |
bf8f6e5b3 Kprobes: The ON/O... |
2493 2494 |
.read = read_enabled_file_bool, .write = write_enabled_file_bool, |
6038f373a llseek: automatic... |
2495 |
.llseek = default_llseek, |
bf8f6e5b3 Kprobes: The ON/O... |
2496 |
}; |
55479f647 kprobes: Allow pr... |
2497 |
static int __init debugfs_kprobe_init(void) |
346fd59ba [PATCH] kprobes: ... |
2498 |
{ |
8c0fd1fa6 kprobes: no need ... |
2499 |
struct dentry *dir; |
bf8f6e5b3 Kprobes: The ON/O... |
2500 |
unsigned int value = 1; |
346fd59ba [PATCH] kprobes: ... |
2501 2502 |
dir = debugfs_create_dir("kprobes", NULL); |
346fd59ba [PATCH] kprobes: ... |
2503 |
|
8c0fd1fa6 kprobes: no need ... |
2504 2505 |
debugfs_create_file("list", 0400, dir, NULL, &debugfs_kprobes_operations); |
346fd59ba [PATCH] kprobes: ... |
2506 |
|
8c0fd1fa6 kprobes: no need ... |
2507 |
debugfs_create_file("enabled", 0600, dir, &value, &fops_kp); |
637247403 kprobes: Show bla... |
2508 |
|
8c0fd1fa6 kprobes: no need ... |
2509 2510 |
debugfs_create_file("blacklist", 0400, dir, NULL, &debugfs_kprobe_blacklist_ops); |
bf8f6e5b3 Kprobes: The ON/O... |
2511 |
|
346fd59ba [PATCH] kprobes: ... |
2512 2513 2514 2515 2516 |
return 0; } late_initcall(debugfs_kprobe_init); #endif /* CONFIG_DEBUG_FS */ |