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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | #ifndef _LINUX_KPROBES_H |
3 | #define _LINUX_KPROBES_H | |
4 | /* | |
5 | * Kernel Probes (KProbes) | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * Copyright (C) IBM Corporation, 2002, 2004 |
8 | * | |
9 | * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel | |
10 | * Probes initial implementation ( includes suggestions from | |
11 | * Rusty Russell). | |
12 | * 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes | |
13 | * interface to access function arguments. | |
b94cce92 HN |
14 | * 2005-May Hien Nguyen <hien@us.ibm.com> and Jim Keniston |
15 | * <jkenisto@us.ibm.com> and Prasanna S Panchamukhi | |
16 | * <prasanna@in.ibm.com> added function-return probes. | |
1da177e4 | 17 | */ |
7d134b2c | 18 | #include <linux/compiler.h> |
36dcd67a | 19 | #include <linux/linkage.h> |
1da177e4 LT |
20 | #include <linux/list.h> |
21 | #include <linux/notifier.h> | |
22 | #include <linux/smp.h> | |
187f1882 | 23 | #include <linux/bug.h> |
e6584523 | 24 | #include <linux/percpu.h> |
3516a460 AM |
25 | #include <linux/spinlock.h> |
26 | #include <linux/rcupdate.h> | |
7a7d1cf9 | 27 | #include <linux/mutex.h> |
ae6aa16f | 28 | #include <linux/ftrace.h> |
4bbd9345 | 29 | #include <linux/objpool.h> |
73f9b911 | 30 | #include <linux/rethook.h> |
7d134b2c | 31 | #include <asm/kprobes.h> |
b94cce92 | 32 | |
00d7c05a | 33 | #ifdef CONFIG_KPROBES |
1da177e4 | 34 | |
ea32c65c PP |
35 | /* kprobe_status settings */ |
36 | #define KPROBE_HIT_ACTIVE 0x00000001 | |
37 | #define KPROBE_HIT_SS 0x00000002 | |
38 | #define KPROBE_REENTER 0x00000004 | |
39 | #define KPROBE_HIT_SSDONE 0x00000008 | |
40 | ||
223a76b2 | 41 | #else /* !CONFIG_KPROBES */ |
7d134b2c | 42 | #include <asm-generic/kprobes.h> |
dc19835d MH |
43 | typedef int kprobe_opcode_t; |
44 | struct arch_specific_insn { | |
45 | int dummy; | |
46 | }; | |
dc19835d | 47 | #endif /* CONFIG_KPROBES */ |
d0aaff97 | 48 | |
1da177e4 LT |
49 | struct kprobe; |
50 | struct pt_regs; | |
b94cce92 HN |
51 | struct kretprobe; |
52 | struct kretprobe_instance; | |
1da177e4 | 53 | typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *); |
1da177e4 LT |
54 | typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *, |
55 | unsigned long flags); | |
b94cce92 HN |
56 | typedef int (*kretprobe_handler_t) (struct kretprobe_instance *, |
57 | struct pt_regs *); | |
58 | ||
1da177e4 LT |
59 | struct kprobe { |
60 | struct hlist_node hlist; | |
61 | ||
64f562c6 AM |
62 | /* list of kprobes for multi-handler support */ |
63 | struct list_head list; | |
64 | ||
ea32c65c PP |
65 | /*count the number of times this probe was temporarily disarmed */ |
66 | unsigned long nmissed; | |
67 | ||
1da177e4 LT |
68 | /* location of the probe point */ |
69 | kprobe_opcode_t *addr; | |
70 | ||
3a872d89 | 71 | /* Allow user to indicate symbol name of the probe point */ |
9b3af29b | 72 | const char *symbol_name; |
3a872d89 AM |
73 | |
74 | /* Offset into the symbol */ | |
75 | unsigned int offset; | |
76 | ||
1da177e4 LT |
77 | /* Called before addr is executed. */ |
78 | kprobe_pre_handler_t pre_handler; | |
79 | ||
80 | /* Called after addr is executed, unless... */ | |
81 | kprobe_post_handler_t post_handler; | |
82 | ||
1da177e4 LT |
83 | /* Saved opcode (which has been replaced with breakpoint) */ |
84 | kprobe_opcode_t opcode; | |
85 | ||
86 | /* copy of the original instruction */ | |
87 | struct arch_specific_insn ainsn; | |
e8386a0c | 88 | |
de5bd88d MH |
89 | /* |
90 | * Indicates various status flags. | |
91 | * Protected by kprobe_mutex after this kprobe is registered. | |
92 | */ | |
e8386a0c | 93 | u32 flags; |
1da177e4 LT |
94 | }; |
95 | ||
e8386a0c MH |
96 | /* Kprobe status flags */ |
97 | #define KPROBE_FLAG_GONE 1 /* breakpoint has already gone */ | |
de5bd88d | 98 | #define KPROBE_FLAG_DISABLED 2 /* probe is temporarily disabled */ |
afd66255 MH |
99 | #define KPROBE_FLAG_OPTIMIZED 4 /* |
100 | * probe is really optimized. | |
101 | * NOTE: | |
102 | * this flag is only for optimized_kprobe. | |
103 | */ | |
ae6aa16f | 104 | #define KPROBE_FLAG_FTRACE 8 /* probe is using ftrace */ |
bf7a87f1 | 105 | #define KPROBE_FLAG_ON_FUNC_ENTRY 16 /* probe is on the function entry */ |
e8386a0c | 106 | |
de5bd88d | 107 | /* Has this kprobe gone ? */ |
29e8077a | 108 | static inline bool kprobe_gone(struct kprobe *p) |
e8386a0c MH |
109 | { |
110 | return p->flags & KPROBE_FLAG_GONE; | |
111 | } | |
112 | ||
de5bd88d | 113 | /* Is this kprobe disabled ? */ |
29e8077a | 114 | static inline bool kprobe_disabled(struct kprobe *p) |
de5bd88d MH |
115 | { |
116 | return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE); | |
117 | } | |
afd66255 MH |
118 | |
119 | /* Is this kprobe really running optimized path ? */ | |
29e8077a | 120 | static inline bool kprobe_optimized(struct kprobe *p) |
afd66255 MH |
121 | { |
122 | return p->flags & KPROBE_FLAG_OPTIMIZED; | |
123 | } | |
ae6aa16f MH |
124 | |
125 | /* Is this kprobe uses ftrace ? */ | |
29e8077a | 126 | static inline bool kprobe_ftrace(struct kprobe *p) |
ae6aa16f MH |
127 | { |
128 | return p->flags & KPROBE_FLAG_FTRACE; | |
129 | } | |
130 | ||
b94cce92 HN |
131 | /* |
132 | * Function-return probe - | |
133 | * Note: | |
134 | * User needs to provide a handler function, and initialize maxactive. | |
135 | * maxactive - The maximum number of instances of the probed function that | |
136 | * can be active concurrently. | |
137 | * nmissed - tracks the number of times the probed function's return was | |
138 | * ignored, due to maxactive being too low. | |
139 | * | |
140 | */ | |
d741bf41 | 141 | struct kretprobe_holder { |
d839a656 | 142 | struct kretprobe __rcu *rp; |
4bbd9345 | 143 | struct objpool_head pool; |
d741bf41 PZ |
144 | }; |
145 | ||
b94cce92 HN |
146 | struct kretprobe { |
147 | struct kprobe kp; | |
148 | kretprobe_handler_t handler; | |
f47cd9b5 | 149 | kretprobe_handler_t entry_handler; |
b94cce92 HN |
150 | int maxactive; |
151 | int nmissed; | |
f47cd9b5 | 152 | size_t data_size; |
73f9b911 MH |
153 | #ifdef CONFIG_KRETPROBE_ON_RETHOOK |
154 | struct rethook *rh; | |
155 | #else | |
d741bf41 | 156 | struct kretprobe_holder *rph; |
73f9b911 | 157 | #endif |
b94cce92 HN |
158 | }; |
159 | ||
6bbfa441 MH |
160 | #define KRETPROBE_MAX_DATA_SIZE 4096 |
161 | ||
b94cce92 | 162 | struct kretprobe_instance { |
73f9b911 MH |
163 | #ifdef CONFIG_KRETPROBE_ON_RETHOOK |
164 | struct rethook_node node; | |
165 | #else | |
4bbd9345 | 166 | struct rcu_head rcu; |
6e426e0f | 167 | struct llist_node llist; |
d741bf41 | 168 | struct kretprobe_holder *rph; |
802eae7c | 169 | kprobe_opcode_t *ret_addr; |
3ff9c075 | 170 | void *fp; |
73f9b911 | 171 | #endif |
67a862a9 | 172 | char data[]; |
b94cce92 HN |
173 | }; |
174 | ||
f438d914 MH |
175 | struct kretprobe_blackpoint { |
176 | const char *name; | |
177 | void *addr; | |
178 | }; | |
3d8d996e | 179 | |
376e2424 MH |
180 | struct kprobe_blacklist_entry { |
181 | struct list_head list; | |
3d8d996e | 182 | unsigned long start_addr; |
376e2424 | 183 | unsigned long end_addr; |
3d8d996e SD |
184 | }; |
185 | ||
dc19835d MH |
186 | #ifdef CONFIG_KPROBES |
187 | DECLARE_PER_CPU(struct kprobe *, current_kprobe); | |
188 | DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); | |
189 | ||
66ada2cc MH |
190 | extern void kprobe_busy_begin(void); |
191 | extern void kprobe_busy_end(void); | |
192 | ||
dc19835d | 193 | #ifdef CONFIG_KRETPROBES |
73f9b911 | 194 | /* Check whether @p is used for implementing a trampoline. */ |
dc19835d | 195 | extern int arch_trampoline_kprobe(struct kprobe *p); |
66ada2cc | 196 | |
73f9b911 MH |
197 | #ifdef CONFIG_KRETPROBE_ON_RETHOOK |
198 | static nokprobe_inline struct kretprobe *get_kretprobe(struct kretprobe_instance *ri) | |
199 | { | |
a1461f1f MHG |
200 | /* rethook::data is non-changed field, so that you can access it freely. */ |
201 | return (struct kretprobe *)ri->node.rethook->data; | |
73f9b911 MH |
202 | } |
203 | static nokprobe_inline unsigned long get_kretprobe_retaddr(struct kretprobe_instance *ri) | |
204 | { | |
205 | return ri->node.ret_addr; | |
206 | } | |
207 | #else | |
208 | extern void arch_prepare_kretprobe(struct kretprobe_instance *ri, | |
209 | struct pt_regs *regs); | |
bf094cff MH |
210 | void arch_kretprobe_fixup_return(struct pt_regs *regs, |
211 | kprobe_opcode_t *correct_ret_addr); | |
212 | ||
adf8a61a | 213 | void __kretprobe_trampoline(void); |
96fed8ac MH |
214 | /* |
215 | * Since some architecture uses structured function pointer, | |
216 | * use dereference_function_descriptor() to get real function address. | |
217 | */ | |
218 | static nokprobe_inline void *kretprobe_trampoline_addr(void) | |
219 | { | |
adf8a61a | 220 | return dereference_kernel_function_descriptor(__kretprobe_trampoline); |
96fed8ac MH |
221 | } |
222 | ||
66ada2cc MH |
223 | /* If the trampoline handler called from a kprobe, use this version */ |
224 | unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs, | |
96fed8ac | 225 | void *frame_pointer); |
66ada2cc MH |
226 | |
227 | static nokprobe_inline | |
228 | unsigned long kretprobe_trampoline_handler(struct pt_regs *regs, | |
96fed8ac | 229 | void *frame_pointer) |
66ada2cc MH |
230 | { |
231 | unsigned long ret; | |
232 | /* | |
233 | * Set a dummy kprobe for avoiding kretprobe recursion. | |
234 | * Since kretprobe never runs in kprobe handler, no kprobe must | |
235 | * be running at this point. | |
236 | */ | |
237 | kprobe_busy_begin(); | |
96fed8ac | 238 | ret = __kretprobe_trampoline_handler(regs, frame_pointer); |
66ada2cc MH |
239 | kprobe_busy_end(); |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
d741bf41 PZ |
244 | static nokprobe_inline struct kretprobe *get_kretprobe(struct kretprobe_instance *ri) |
245 | { | |
d839a656 | 246 | return rcu_dereference_check(ri->rph->rp, rcu_read_lock_any_held()); |
d741bf41 PZ |
247 | } |
248 | ||
73f9b911 MH |
249 | static nokprobe_inline unsigned long get_kretprobe_retaddr(struct kretprobe_instance *ri) |
250 | { | |
251 | return (unsigned long)ri->ret_addr; | |
252 | } | |
253 | #endif /* CONFIG_KRETPROBE_ON_RETHOOK */ | |
254 | ||
223a76b2 | 255 | #else /* !CONFIG_KRETPROBES */ |
dc19835d MH |
256 | static inline void arch_prepare_kretprobe(struct kretprobe *rp, |
257 | struct pt_regs *regs) | |
258 | { | |
259 | } | |
260 | static inline int arch_trampoline_kprobe(struct kprobe *p) | |
261 | { | |
262 | return 0; | |
263 | } | |
264 | #endif /* CONFIG_KRETPROBES */ | |
265 | ||
223a76b2 MH |
266 | /* Markers of '_kprobe_blacklist' section */ |
267 | extern unsigned long __start_kprobe_blacklist[]; | |
268 | extern unsigned long __stop_kprobe_blacklist[]; | |
269 | ||
f438d914 MH |
270 | extern struct kretprobe_blackpoint kretprobe_blacklist[]; |
271 | ||
8c1c9356 AM |
272 | #ifdef CONFIG_KPROBES_SANITY_TEST |
273 | extern int init_test_probes(void); | |
223a76b2 | 274 | #else /* !CONFIG_KPROBES_SANITY_TEST */ |
8c1c9356 AM |
275 | static inline int init_test_probes(void) |
276 | { | |
277 | return 0; | |
278 | } | |
279 | #endif /* CONFIG_KPROBES_SANITY_TEST */ | |
280 | ||
1da177e4 | 281 | extern int arch_prepare_kprobe(struct kprobe *p); |
7e1048b1 RL |
282 | extern void arch_arm_kprobe(struct kprobe *p); |
283 | extern void arch_disarm_kprobe(struct kprobe *p); | |
6772926b | 284 | extern int arch_init_kprobes(void); |
bf8d5c52 | 285 | extern void kprobes_inc_nmissed_count(struct kprobe *p); |
be8f2743 | 286 | extern bool arch_within_kprobe_blacklist(unsigned long addr); |
fb1a59fa | 287 | extern int arch_populate_kprobe_blacklist(void); |
97c753e6 | 288 | extern int kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset); |
1da177e4 | 289 | |
e5779e8e | 290 | extern bool within_kprobe_blacklist(unsigned long addr); |
fb1a59fa MH |
291 | extern int kprobe_add_ksym_blacklist(unsigned long entry); |
292 | extern int kprobe_add_area_blacklist(unsigned long start, unsigned long end); | |
e5779e8e | 293 | |
c802d64a HC |
294 | struct kprobe_insn_cache { |
295 | struct mutex mutex; | |
af96397d HC |
296 | void *(*alloc)(void); /* allocate insn page */ |
297 | void (*free)(void *); /* free insn page */ | |
d002b8bc | 298 | const char *sym; /* symbol for insn pages */ |
c802d64a HC |
299 | struct list_head pages; /* list of kprobe_insn_page */ |
300 | size_t insn_size; /* size of instruction slot */ | |
301 | int nr_garbage; | |
302 | }; | |
303 | ||
5b485629 | 304 | #ifdef __ARCH_WANT_KPROBES_INSN_SLOT |
c802d64a HC |
305 | extern kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c); |
306 | extern void __free_insn_slot(struct kprobe_insn_cache *c, | |
307 | kprobe_opcode_t *slot, int dirty); | |
5b485629 MH |
308 | /* sleep-less address checking routine */ |
309 | extern bool __is_insn_slot_addr(struct kprobe_insn_cache *c, | |
310 | unsigned long addr); | |
c802d64a HC |
311 | |
312 | #define DEFINE_INSN_CACHE_OPS(__name) \ | |
313 | extern struct kprobe_insn_cache kprobe_##__name##_slots; \ | |
314 | \ | |
315 | static inline kprobe_opcode_t *get_##__name##_slot(void) \ | |
316 | { \ | |
317 | return __get_insn_slot(&kprobe_##__name##_slots); \ | |
318 | } \ | |
319 | \ | |
320 | static inline void free_##__name##_slot(kprobe_opcode_t *slot, int dirty)\ | |
321 | { \ | |
322 | __free_insn_slot(&kprobe_##__name##_slots, slot, dirty); \ | |
323 | } \ | |
5b485629 MH |
324 | \ |
325 | static inline bool is_kprobe_##__name##_slot(unsigned long addr) \ | |
326 | { \ | |
327 | return __is_insn_slot_addr(&kprobe_##__name##_slots, addr); \ | |
328 | } | |
d002b8bc AH |
329 | #define KPROBE_INSN_PAGE_SYM "kprobe_insn_page" |
330 | #define KPROBE_OPTINSN_PAGE_SYM "kprobe_optinsn_page" | |
331 | int kprobe_cache_get_kallsym(struct kprobe_insn_cache *c, unsigned int *symnum, | |
332 | unsigned long *value, char *type, char *sym); | |
223a76b2 | 333 | #else /* !__ARCH_WANT_KPROBES_INSN_SLOT */ |
5b485629 MH |
334 | #define DEFINE_INSN_CACHE_OPS(__name) \ |
335 | static inline bool is_kprobe_##__name##_slot(unsigned long addr) \ | |
336 | { \ | |
337 | return 0; \ | |
338 | } | |
339 | #endif | |
c802d64a HC |
340 | |
341 | DEFINE_INSN_CACHE_OPS(insn); | |
342 | ||
afd66255 MH |
343 | #ifdef CONFIG_OPTPROBES |
344 | /* | |
345 | * Internal structure for direct jump optimized probe | |
346 | */ | |
347 | struct optimized_kprobe { | |
348 | struct kprobe kp; | |
349 | struct list_head list; /* list for optimizing queue */ | |
350 | struct arch_optimized_insn optinsn; | |
351 | }; | |
352 | ||
353 | /* Architecture dependent functions for direct jump optimization */ | |
354 | extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn); | |
355 | extern int arch_check_optimized_kprobe(struct optimized_kprobe *op); | |
cbf6ab52 MH |
356 | extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, |
357 | struct kprobe *orig); | |
afd66255 | 358 | extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op); |
cd7ebe22 | 359 | extern void arch_optimize_kprobes(struct list_head *oplist); |
f984ba4e MH |
360 | extern void arch_unoptimize_kprobes(struct list_head *oplist, |
361 | struct list_head *done_list); | |
afd66255 | 362 | extern void arch_unoptimize_kprobe(struct optimized_kprobe *op); |
afd66255 | 363 | extern int arch_within_optimized_kprobe(struct optimized_kprobe *op, |
c42421e2 | 364 | kprobe_opcode_t *addr); |
afd66255 MH |
365 | |
366 | extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs); | |
b2be84df | 367 | |
c802d64a HC |
368 | DEFINE_INSN_CACHE_OPS(optinsn); |
369 | ||
30e7d894 | 370 | extern void wait_for_kprobe_optimizer(void); |
868a6fc0 | 371 | bool optprobe_queued_unopt(struct optimized_kprobe *op); |
f1c97a1b | 372 | bool kprobe_disarmed(struct kprobe *p); |
223a76b2 | 373 | #else /* !CONFIG_OPTPROBES */ |
30e7d894 | 374 | static inline void wait_for_kprobe_optimizer(void) { } |
afd66255 | 375 | #endif /* CONFIG_OPTPROBES */ |
223a76b2 | 376 | |
e7dbfe34 | 377 | #ifdef CONFIG_KPROBES_ON_FTRACE |
ae6aa16f | 378 | extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip, |
d19ad077 | 379 | struct ftrace_ops *ops, struct ftrace_regs *fregs); |
ae6aa16f | 380 | extern int arch_prepare_kprobe_ftrace(struct kprobe *p); |
02afb8d6 PA |
381 | #else |
382 | static inline int arch_prepare_kprobe_ftrace(struct kprobe *p) | |
383 | { | |
384 | return -EINVAL; | |
385 | } | |
223a76b2 | 386 | #endif /* CONFIG_KPROBES_ON_FTRACE */ |
ae6aa16f | 387 | |
d217d545 | 388 | /* Get the kprobe at this addr (if any) - called with preemption disabled */ |
1da177e4 LT |
389 | struct kprobe *get_kprobe(void *addr); |
390 | ||
e6584523 AM |
391 | /* kprobe_running() will just return the current_kprobe on this CPU */ |
392 | static inline struct kprobe *kprobe_running(void) | |
393 | { | |
223a76b2 | 394 | return __this_cpu_read(current_kprobe); |
e6584523 AM |
395 | } |
396 | ||
397 | static inline void reset_current_kprobe(void) | |
398 | { | |
b76834bc | 399 | __this_cpu_write(current_kprobe, NULL); |
e6584523 AM |
400 | } |
401 | ||
402 | static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void) | |
403 | { | |
bdffd893 | 404 | return this_cpu_ptr(&kprobe_ctlblk); |
e6584523 AM |
405 | } |
406 | ||
290e3070 | 407 | kprobe_opcode_t *kprobe_lookup_name(const char *name, unsigned int offset); |
cc66bb91 PZ |
408 | kprobe_opcode_t *arch_adjust_kprobe_addr(unsigned long addr, unsigned long offset, bool *on_func_entry); |
409 | ||
1da177e4 LT |
410 | int register_kprobe(struct kprobe *p); |
411 | void unregister_kprobe(struct kprobe *p); | |
9861668f MH |
412 | int register_kprobes(struct kprobe **kps, int num); |
413 | void unregister_kprobes(struct kprobe **kps, int num); | |
1da177e4 | 414 | |
b94cce92 HN |
415 | int register_kretprobe(struct kretprobe *rp); |
416 | void unregister_kretprobe(struct kretprobe *rp); | |
4a296e07 MH |
417 | int register_kretprobes(struct kretprobe **rps, int num); |
418 | void unregister_kretprobes(struct kretprobe **rps, int num); | |
b94cce92 | 419 | |
43994049 | 420 | #if defined(CONFIG_KRETPROBE_ON_RETHOOK) || !defined(CONFIG_KRETPROBES) |
73f9b911 MH |
421 | #define kprobe_flush_task(tk) do {} while (0) |
422 | #else | |
b94cce92 | 423 | void kprobe_flush_task(struct task_struct *tk); |
73f9b911 | 424 | #endif |
8c1c9356 | 425 | |
82d083ab MH |
426 | void kprobe_free_init_mem(void); |
427 | ||
de5bd88d MH |
428 | int disable_kprobe(struct kprobe *kp); |
429 | int enable_kprobe(struct kprobe *kp); | |
430 | ||
24851d24 FW |
431 | void dump_kprobe(struct kprobe *kp); |
432 | ||
ad3bc25a | 433 | void *alloc_insn_page(void); |
ad3bc25a | 434 | |
7ee3e97e CL |
435 | void *alloc_optinsn_page(void); |
436 | void free_optinsn_page(void *page); | |
437 | ||
d002b8bc AH |
438 | int kprobe_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
439 | char *sym); | |
440 | ||
441 | int arch_kprobe_get_kallsym(unsigned int *symnum, unsigned long *value, | |
442 | char *type, char *sym); | |
abc28463 AB |
443 | |
444 | int kprobe_exceptions_notify(struct notifier_block *self, | |
445 | unsigned long val, void *data); | |
446 | ||
b1801812 | 447 | #else /* !CONFIG_KPROBES: */ |
00d7c05a | 448 | |
b1801812 IM |
449 | static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr) |
450 | { | |
451 | return 0; | |
452 | } | |
785656a4 AS |
453 | static inline struct kprobe *get_kprobe(void *addr) |
454 | { | |
455 | return NULL; | |
456 | } | |
e6584523 | 457 | static inline struct kprobe *kprobe_running(void) |
1da177e4 | 458 | { |
e6584523 | 459 | return NULL; |
1da177e4 | 460 | } |
ab51e15d MH |
461 | #define kprobe_busy_begin() do {} while (0) |
462 | #define kprobe_busy_end() do {} while (0) | |
463 | ||
1da177e4 LT |
464 | static inline int register_kprobe(struct kprobe *p) |
465 | { | |
223a76b2 | 466 | return -EOPNOTSUPP; |
1da177e4 | 467 | } |
9861668f MH |
468 | static inline int register_kprobes(struct kprobe **kps, int num) |
469 | { | |
223a76b2 | 470 | return -EOPNOTSUPP; |
9861668f | 471 | } |
1da177e4 LT |
472 | static inline void unregister_kprobe(struct kprobe *p) |
473 | { | |
474 | } | |
9861668f MH |
475 | static inline void unregister_kprobes(struct kprobe **kps, int num) |
476 | { | |
477 | } | |
b94cce92 HN |
478 | static inline int register_kretprobe(struct kretprobe *rp) |
479 | { | |
223a76b2 | 480 | return -EOPNOTSUPP; |
b94cce92 | 481 | } |
4a296e07 MH |
482 | static inline int register_kretprobes(struct kretprobe **rps, int num) |
483 | { | |
223a76b2 | 484 | return -EOPNOTSUPP; |
4a296e07 | 485 | } |
b94cce92 HN |
486 | static inline void unregister_kretprobe(struct kretprobe *rp) |
487 | { | |
488 | } | |
4a296e07 MH |
489 | static inline void unregister_kretprobes(struct kretprobe **rps, int num) |
490 | { | |
491 | } | |
b94cce92 HN |
492 | static inline void kprobe_flush_task(struct task_struct *tk) |
493 | { | |
494 | } | |
82d083ab MH |
495 | static inline void kprobe_free_init_mem(void) |
496 | { | |
497 | } | |
de5bd88d MH |
498 | static inline int disable_kprobe(struct kprobe *kp) |
499 | { | |
223a76b2 | 500 | return -EOPNOTSUPP; |
de5bd88d MH |
501 | } |
502 | static inline int enable_kprobe(struct kprobe *kp) | |
503 | { | |
223a76b2 | 504 | return -EOPNOTSUPP; |
de5bd88d | 505 | } |
fab94075 BP |
506 | |
507 | static inline bool within_kprobe_blacklist(unsigned long addr) | |
508 | { | |
509 | return true; | |
510 | } | |
d002b8bc AH |
511 | static inline int kprobe_get_kallsym(unsigned int symnum, unsigned long *value, |
512 | char *type, char *sym) | |
513 | { | |
514 | return -ERANGE; | |
515 | } | |
b1801812 | 516 | #endif /* CONFIG_KPROBES */ |
223a76b2 | 517 | |
8f9b1528 MH |
518 | static inline int disable_kretprobe(struct kretprobe *rp) |
519 | { | |
520 | return disable_kprobe(&rp->kp); | |
521 | } | |
522 | static inline int enable_kretprobe(struct kretprobe *rp) | |
523 | { | |
524 | return enable_kprobe(&rp->kp); | |
525 | } | |
8f9b1528 | 526 | |
5b485629 MH |
527 | #ifndef CONFIG_KPROBES |
528 | static inline bool is_kprobe_insn_slot(unsigned long addr) | |
529 | { | |
530 | return false; | |
531 | } | |
223a76b2 MH |
532 | #endif /* !CONFIG_KPROBES */ |
533 | ||
5b485629 MH |
534 | #ifndef CONFIG_OPTPROBES |
535 | static inline bool is_kprobe_optinsn_slot(unsigned long addr) | |
536 | { | |
537 | return false; | |
538 | } | |
223a76b2 | 539 | #endif /* !CONFIG_OPTPROBES */ |
5b485629 | 540 | |
03bac0df | 541 | #ifdef CONFIG_KRETPROBES |
73f9b911 MH |
542 | #ifdef CONFIG_KRETPROBE_ON_RETHOOK |
543 | static nokprobe_inline bool is_kretprobe_trampoline(unsigned long addr) | |
544 | { | |
545 | return is_rethook_trampoline(addr); | |
546 | } | |
547 | ||
548 | static nokprobe_inline | |
549 | unsigned long kretprobe_find_ret_addr(struct task_struct *tsk, void *fp, | |
550 | struct llist_node **cur) | |
551 | { | |
552 | return rethook_find_ret_addr(tsk, (unsigned long)fp, cur); | |
553 | } | |
554 | #else | |
03bac0df MH |
555 | static nokprobe_inline bool is_kretprobe_trampoline(unsigned long addr) |
556 | { | |
557 | return (void *)addr == kretprobe_trampoline_addr(); | |
558 | } | |
559 | ||
560 | unsigned long kretprobe_find_ret_addr(struct task_struct *tsk, void *fp, | |
561 | struct llist_node **cur); | |
73f9b911 | 562 | #endif |
03bac0df MH |
563 | #else |
564 | static nokprobe_inline bool is_kretprobe_trampoline(unsigned long addr) | |
565 | { | |
566 | return false; | |
567 | } | |
568 | ||
569 | static nokprobe_inline | |
570 | unsigned long kretprobe_find_ret_addr(struct task_struct *tsk, void *fp, | |
571 | struct llist_node **cur) | |
572 | { | |
573 | return 0; | |
574 | } | |
575 | #endif | |
576 | ||
b98cca44 AK |
577 | /* Returns true if kprobes handled the fault */ |
578 | static nokprobe_inline bool kprobe_page_fault(struct pt_regs *regs, | |
579 | unsigned int trap) | |
580 | { | |
dfc05b55 | 581 | if (!IS_ENABLED(CONFIG_KPROBES)) |
b98cca44 AK |
582 | return false; |
583 | if (user_mode(regs)) | |
584 | return false; | |
585 | /* | |
586 | * To be potentially processing a kprobe fault and to be allowed | |
587 | * to call kprobe_running(), we have to be non-preemptible. | |
588 | */ | |
589 | if (preemptible()) | |
590 | return false; | |
591 | if (!kprobe_running()) | |
592 | return false; | |
593 | return kprobe_fault_handler(regs, trap); | |
594 | } | |
595 | ||
b1801812 | 596 | #endif /* _LINUX_KPROBES_H */ |