1#ifndef _LINUX_KPROBES_H
2#define _LINUX_KPROBES_H
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32#include <linux/compiler.h>
33#include <linux/linkage.h>
34#include <linux/list.h>
35#include <linux/notifier.h>
36#include <linux/smp.h>
37#include <linux/bug.h>
38#include <linux/percpu.h>
39#include <linux/spinlock.h>
40#include <linux/rcupdate.h>
41#include <linux/mutex.h>
42#include <linux/ftrace.h>
43
44#ifdef CONFIG_KPROBES
45#include <asm/kprobes.h>
46
47
48#define KPROBE_HIT_ACTIVE 0x00000001
49#define KPROBE_HIT_SS 0x00000002
50#define KPROBE_REENTER 0x00000004
51#define KPROBE_HIT_SSDONE 0x00000008
52
53#else
54typedef int kprobe_opcode_t;
55struct arch_specific_insn {
56 int dummy;
57};
58#endif
59
60struct kprobe;
61struct pt_regs;
62struct kretprobe;
63struct kretprobe_instance;
64typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
65typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
66typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
67 unsigned long flags);
68typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
69 int trapnr);
70typedef int (*kretprobe_handler_t) (struct kretprobe_instance *,
71 struct pt_regs *);
72
73struct kprobe {
74 struct hlist_node hlist;
75
76
77 struct list_head list;
78
79
80 unsigned long nmissed;
81
82
83 kprobe_opcode_t *addr;
84
85
86 const char *symbol_name;
87
88
89 unsigned int offset;
90
91
92 kprobe_pre_handler_t pre_handler;
93
94
95 kprobe_post_handler_t post_handler;
96
97
98
99
100
101 kprobe_fault_handler_t fault_handler;
102
103
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105
106
107 kprobe_break_handler_t break_handler;
108
109
110 kprobe_opcode_t opcode;
111
112
113 struct arch_specific_insn ainsn;
114
115
116
117
118
119 u32 flags;
120};
121
122
123#define KPROBE_FLAG_GONE 1
124#define KPROBE_FLAG_DISABLED 2
125#define KPROBE_FLAG_OPTIMIZED 4
126
127
128
129
130#define KPROBE_FLAG_FTRACE 8
131
132
133static inline int kprobe_gone(struct kprobe *p)
134{
135 return p->flags & KPROBE_FLAG_GONE;
136}
137
138
139static inline int kprobe_disabled(struct kprobe *p)
140{
141 return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE);
142}
143
144
145static inline int kprobe_optimized(struct kprobe *p)
146{
147 return p->flags & KPROBE_FLAG_OPTIMIZED;
148}
149
150
151static inline int kprobe_ftrace(struct kprobe *p)
152{
153 return p->flags & KPROBE_FLAG_FTRACE;
154}
155
156
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158
159
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161
162
163
164
165
166struct jprobe {
167 struct kprobe kp;
168 void *entry;
169};
170
171
172#define JPROBE_ENTRY(handler) (handler)
173
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180
181
182
183
184struct kretprobe {
185 struct kprobe kp;
186 kretprobe_handler_t handler;
187 kretprobe_handler_t entry_handler;
188 int maxactive;
189 int nmissed;
190 size_t data_size;
191 struct hlist_head free_instances;
192 raw_spinlock_t lock;
193};
194
195struct kretprobe_instance {
196 struct hlist_node hlist;
197 struct kretprobe *rp;
198 kprobe_opcode_t *ret_addr;
199 struct task_struct *task;
200 char data[0];
201};
202
203struct kretprobe_blackpoint {
204 const char *name;
205 void *addr;
206};
207
208struct kprobe_blacklist_entry {
209 struct list_head list;
210 unsigned long start_addr;
211 unsigned long end_addr;
212};
213
214#ifdef CONFIG_KPROBES
215DECLARE_PER_CPU(struct kprobe *, current_kprobe);
216DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
217
218
219
220
221static inline int kprobes_built_in(void)
222{
223 return 1;
224}
225
226#ifdef CONFIG_KRETPROBES
227extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
228 struct pt_regs *regs);
229extern int arch_trampoline_kprobe(struct kprobe *p);
230#else
231static inline void arch_prepare_kretprobe(struct kretprobe *rp,
232 struct pt_regs *regs)
233{
234}
235static inline int arch_trampoline_kprobe(struct kprobe *p)
236{
237 return 0;
238}
239#endif
240
241extern struct kretprobe_blackpoint kretprobe_blacklist[];
242
243static inline void kretprobe_assert(struct kretprobe_instance *ri,
244 unsigned long orig_ret_address, unsigned long trampoline_address)
245{
246 if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
247 printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
248 ri->rp, ri->rp->kp.addr);
249 BUG();
250 }
251}
252
253#ifdef CONFIG_KPROBES_SANITY_TEST
254extern int init_test_probes(void);
255#else
256static inline int init_test_probes(void)
257{
258 return 0;
259}
260#endif
261
262extern int arch_prepare_kprobe(struct kprobe *p);
263extern void arch_arm_kprobe(struct kprobe *p);
264extern void arch_disarm_kprobe(struct kprobe *p);
265extern int arch_init_kprobes(void);
266extern void show_registers(struct pt_regs *regs);
267extern void kprobes_inc_nmissed_count(struct kprobe *p);
268extern bool arch_within_kprobe_blacklist(unsigned long addr);
269
270extern bool within_kprobe_blacklist(unsigned long addr);
271
272struct kprobe_insn_cache {
273 struct mutex mutex;
274 void *(*alloc)(void);
275 void (*free)(void *);
276 struct list_head pages;
277 size_t insn_size;
278 int nr_garbage;
279};
280
281extern kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c);
282extern void __free_insn_slot(struct kprobe_insn_cache *c,
283 kprobe_opcode_t *slot, int dirty);
284
285#define DEFINE_INSN_CACHE_OPS(__name) \
286extern struct kprobe_insn_cache kprobe_##__name##_slots; \
287 \
288static inline kprobe_opcode_t *get_##__name##_slot(void) \
289{ \
290 return __get_insn_slot(&kprobe_##__name##_slots); \
291} \
292 \
293static inline void free_##__name##_slot(kprobe_opcode_t *slot, int dirty)\
294{ \
295 __free_insn_slot(&kprobe_##__name##_slots, slot, dirty); \
296} \
297
298DEFINE_INSN_CACHE_OPS(insn);
299
300#ifdef CONFIG_OPTPROBES
301
302
303
304struct optimized_kprobe {
305 struct kprobe kp;
306 struct list_head list;
307 struct arch_optimized_insn optinsn;
308};
309
310
311extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn);
312extern int arch_check_optimized_kprobe(struct optimized_kprobe *op);
313extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op,
314 struct kprobe *orig);
315extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
316extern void arch_optimize_kprobes(struct list_head *oplist);
317extern void arch_unoptimize_kprobes(struct list_head *oplist,
318 struct list_head *done_list);
319extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
320extern int arch_within_optimized_kprobe(struct optimized_kprobe *op,
321 unsigned long addr);
322
323extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs);
324
325DEFINE_INSN_CACHE_OPS(optinsn);
326
327#ifdef CONFIG_SYSCTL
328extern int sysctl_kprobes_optimization;
329extern int proc_kprobes_optimization_handler(struct ctl_table *table,
330 int write, void __user *buffer,
331 size_t *length, loff_t *ppos);
332#endif
333
334#endif
335#ifdef CONFIG_KPROBES_ON_FTRACE
336extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
337 struct ftrace_ops *ops, struct pt_regs *regs);
338extern int arch_prepare_kprobe_ftrace(struct kprobe *p);
339#endif
340
341int arch_check_ftrace_location(struct kprobe *p);
342
343
344struct kprobe *get_kprobe(void *addr);
345void kretprobe_hash_lock(struct task_struct *tsk,
346 struct hlist_head **head, unsigned long *flags);
347void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
348struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
349
350
351static inline struct kprobe *kprobe_running(void)
352{
353 return (__this_cpu_read(current_kprobe));
354}
355
356static inline void reset_current_kprobe(void)
357{
358 __this_cpu_write(current_kprobe, NULL);
359}
360
361static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
362{
363 return this_cpu_ptr(&kprobe_ctlblk);
364}
365
366int register_kprobe(struct kprobe *p);
367void unregister_kprobe(struct kprobe *p);
368int register_kprobes(struct kprobe **kps, int num);
369void unregister_kprobes(struct kprobe **kps, int num);
370int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
371int longjmp_break_handler(struct kprobe *, struct pt_regs *);
372int register_jprobe(struct jprobe *p);
373void unregister_jprobe(struct jprobe *p);
374int register_jprobes(struct jprobe **jps, int num);
375void unregister_jprobes(struct jprobe **jps, int num);
376void jprobe_return(void);
377unsigned long arch_deref_entry_point(void *);
378
379int register_kretprobe(struct kretprobe *rp);
380void unregister_kretprobe(struct kretprobe *rp);
381int register_kretprobes(struct kretprobe **rps, int num);
382void unregister_kretprobes(struct kretprobe **rps, int num);
383
384void kprobe_flush_task(struct task_struct *tk);
385void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
386
387int disable_kprobe(struct kprobe *kp);
388int enable_kprobe(struct kprobe *kp);
389
390void dump_kprobe(struct kprobe *kp);
391
392#else
393
394static inline int kprobes_built_in(void)
395{
396 return 0;
397}
398static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
399{
400 return 0;
401}
402static inline struct kprobe *get_kprobe(void *addr)
403{
404 return NULL;
405}
406static inline struct kprobe *kprobe_running(void)
407{
408 return NULL;
409}
410static inline int register_kprobe(struct kprobe *p)
411{
412 return -ENOSYS;
413}
414static inline int register_kprobes(struct kprobe **kps, int num)
415{
416 return -ENOSYS;
417}
418static inline void unregister_kprobe(struct kprobe *p)
419{
420}
421static inline void unregister_kprobes(struct kprobe **kps, int num)
422{
423}
424static inline int register_jprobe(struct jprobe *p)
425{
426 return -ENOSYS;
427}
428static inline int register_jprobes(struct jprobe **jps, int num)
429{
430 return -ENOSYS;
431}
432static inline void unregister_jprobe(struct jprobe *p)
433{
434}
435static inline void unregister_jprobes(struct jprobe **jps, int num)
436{
437}
438static inline void jprobe_return(void)
439{
440}
441static inline int register_kretprobe(struct kretprobe *rp)
442{
443 return -ENOSYS;
444}
445static inline int register_kretprobes(struct kretprobe **rps, int num)
446{
447 return -ENOSYS;
448}
449static inline void unregister_kretprobe(struct kretprobe *rp)
450{
451}
452static inline void unregister_kretprobes(struct kretprobe **rps, int num)
453{
454}
455static inline void kprobe_flush_task(struct task_struct *tk)
456{
457}
458static inline int disable_kprobe(struct kprobe *kp)
459{
460 return -ENOSYS;
461}
462static inline int enable_kprobe(struct kprobe *kp)
463{
464 return -ENOSYS;
465}
466#endif
467static inline int disable_kretprobe(struct kretprobe *rp)
468{
469 return disable_kprobe(&rp->kp);
470}
471static inline int enable_kretprobe(struct kretprobe *rp)
472{
473 return enable_kprobe(&rp->kp);
474}
475static inline int disable_jprobe(struct jprobe *jp)
476{
477 return disable_kprobe(&jp->kp);
478}
479static inline int enable_jprobe(struct jprobe *jp)
480{
481 return enable_kprobe(&jp->kp);
482}
483
484#ifdef CONFIG_KPROBES
485
486
487
488
489#define __NOKPROBE_SYMBOL(fname) \
490static unsigned long __used \
491 __attribute__((section("_kprobe_blacklist"))) \
492 _kbl_addr_##fname = (unsigned long)fname;
493#define NOKPROBE_SYMBOL(fname) __NOKPROBE_SYMBOL(fname)
494#else
495#define NOKPROBE_SYMBOL(fname)
496#endif
497
498#endif
499