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-rw-r--r--kernel/trace/trace_kprobe.c899
1 files changed, 23 insertions, 876 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 580a05ec926b..b31d3d5699fe 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -19,547 +19,15 @@
19 19
20#include <linux/module.h> 20#include <linux/module.h>
21#include <linux/uaccess.h> 21#include <linux/uaccess.h>
22#include <linux/kprobes.h>
23#include <linux/seq_file.h>
24#include <linux/slab.h>
25#include <linux/smp.h>
26#include <linux/debugfs.h>
27#include <linux/types.h>
28#include <linux/string.h>
29#include <linux/ctype.h>
30#include <linux/ptrace.h>
31#include <linux/perf_event.h>
32#include <linux/stringify.h>
33#include <linux/limits.h>
34#include <asm/bitsperlong.h>
35
36#include "trace.h"
37#include "trace_output.h"
38
39#define MAX_TRACE_ARGS 128
40#define MAX_ARGSTR_LEN 63
41#define MAX_EVENT_NAME_LEN 64
42#define MAX_STRING_SIZE PATH_MAX
43#define KPROBE_EVENT_SYSTEM "kprobes"
44
45/* Reserved field names */
46#define FIELD_STRING_IP "__probe_ip"
47#define FIELD_STRING_RETIP "__probe_ret_ip"
48#define FIELD_STRING_FUNC "__probe_func"
49
50const char *reserved_field_names[] = {
51 "common_type",
52 "common_flags",
53 "common_preempt_count",
54 "common_pid",
55 "common_tgid",
56 FIELD_STRING_IP,
57 FIELD_STRING_RETIP,
58 FIELD_STRING_FUNC,
59};
60
61/* Printing function type */
62typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *,
63 void *);
64#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
65#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
66
67/* Printing in basic type function template */
68#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast) \
69static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \
70 const char *name, \
71 void *data, void *ent)\
72{ \
73 return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\
74} \
75static const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
76
77DEFINE_BASIC_PRINT_TYPE_FUNC(u8, "%x", unsigned int)
78DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "%x", unsigned int)
79DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "%lx", unsigned long)
80DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "%llx", unsigned long long)
81DEFINE_BASIC_PRINT_TYPE_FUNC(s8, "%d", int)
82DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int)
83DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long)
84DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long)
85
86/* data_rloc: data relative location, compatible with u32 */
87#define make_data_rloc(len, roffs) \
88 (((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
89#define get_rloc_len(dl) ((u32)(dl) >> 16)
90#define get_rloc_offs(dl) ((u32)(dl) & 0xffff)
91
92static inline void *get_rloc_data(u32 *dl)
93{
94 return (u8 *)dl + get_rloc_offs(*dl);
95}
96
97/* For data_loc conversion */
98static inline void *get_loc_data(u32 *dl, void *ent)
99{
100 return (u8 *)ent + get_rloc_offs(*dl);
101}
102
103/*
104 * Convert data_rloc to data_loc:
105 * data_rloc stores the offset from data_rloc itself, but data_loc
106 * stores the offset from event entry.
107 */
108#define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs))
109
110/* For defining macros, define string/string_size types */
111typedef u32 string;
112typedef u32 string_size;
113
114/* Print type function for string type */
115static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
116 const char *name,
117 void *data, void *ent)
118{
119 int len = *(u32 *)data >> 16;
120
121 if (!len)
122 return trace_seq_printf(s, " %s=(fault)", name);
123 else
124 return trace_seq_printf(s, " %s=\"%s\"", name,
125 (const char *)get_loc_data(data, ent));
126}
127static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
128
129/* Data fetch function type */
130typedef void (*fetch_func_t)(struct pt_regs *, void *, void *);
131
132struct fetch_param {
133 fetch_func_t fn;
134 void *data;
135};
136
137static __kprobes void call_fetch(struct fetch_param *fprm,
138 struct pt_regs *regs, void *dest)
139{
140 return fprm->fn(regs, fprm->data, dest);
141}
142
143#define FETCH_FUNC_NAME(method, type) fetch_##method##_##type
144/*
145 * Define macro for basic types - we don't need to define s* types, because
146 * we have to care only about bitwidth at recording time.
147 */
148#define DEFINE_BASIC_FETCH_FUNCS(method) \
149DEFINE_FETCH_##method(u8) \
150DEFINE_FETCH_##method(u16) \
151DEFINE_FETCH_##method(u32) \
152DEFINE_FETCH_##method(u64)
153
154#define CHECK_FETCH_FUNCS(method, fn) \
155 (((FETCH_FUNC_NAME(method, u8) == fn) || \
156 (FETCH_FUNC_NAME(method, u16) == fn) || \
157 (FETCH_FUNC_NAME(method, u32) == fn) || \
158 (FETCH_FUNC_NAME(method, u64) == fn) || \
159 (FETCH_FUNC_NAME(method, string) == fn) || \
160 (FETCH_FUNC_NAME(method, string_size) == fn)) \
161 && (fn != NULL))
162
163/* Data fetch function templates */
164#define DEFINE_FETCH_reg(type) \
165static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, \
166 void *offset, void *dest) \
167{ \
168 *(type *)dest = (type)regs_get_register(regs, \
169 (unsigned int)((unsigned long)offset)); \
170}
171DEFINE_BASIC_FETCH_FUNCS(reg)
172/* No string on the register */
173#define fetch_reg_string NULL
174#define fetch_reg_string_size NULL
175
176#define DEFINE_FETCH_stack(type) \
177static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
178 void *offset, void *dest) \
179{ \
180 *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \
181 (unsigned int)((unsigned long)offset)); \
182}
183DEFINE_BASIC_FETCH_FUNCS(stack)
184/* No string on the stack entry */
185#define fetch_stack_string NULL
186#define fetch_stack_string_size NULL
187
188#define DEFINE_FETCH_retval(type) \
189static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
190 void *dummy, void *dest) \
191{ \
192 *(type *)dest = (type)regs_return_value(regs); \
193}
194DEFINE_BASIC_FETCH_FUNCS(retval)
195/* No string on the retval */
196#define fetch_retval_string NULL
197#define fetch_retval_string_size NULL
198
199#define DEFINE_FETCH_memory(type) \
200static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
201 void *addr, void *dest) \
202{ \
203 type retval; \
204 if (probe_kernel_address(addr, retval)) \
205 *(type *)dest = 0; \
206 else \
207 *(type *)dest = retval; \
208}
209DEFINE_BASIC_FETCH_FUNCS(memory)
210/*
211 * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
212 * length and relative data location.
213 */
214static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
215 void *addr, void *dest)
216{
217 long ret;
218 int maxlen = get_rloc_len(*(u32 *)dest);
219 u8 *dst = get_rloc_data(dest);
220 u8 *src = addr;
221 mm_segment_t old_fs = get_fs();
222 if (!maxlen)
223 return;
224 /*
225 * Try to get string again, since the string can be changed while
226 * probing.
227 */
228 set_fs(KERNEL_DS);
229 pagefault_disable();
230 do
231 ret = __copy_from_user_inatomic(dst++, src++, 1);
232 while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
233 dst[-1] = '\0';
234 pagefault_enable();
235 set_fs(old_fs);
236
237 if (ret < 0) { /* Failed to fetch string */
238 ((u8 *)get_rloc_data(dest))[0] = '\0';
239 *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
240 } else
241 *(u32 *)dest = make_data_rloc(src - (u8 *)addr,
242 get_rloc_offs(*(u32 *)dest));
243}
244/* Return the length of string -- including null terminal byte */
245static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
246 void *addr, void *dest)
247{
248 int ret, len = 0;
249 u8 c;
250 mm_segment_t old_fs = get_fs();
251
252 set_fs(KERNEL_DS);
253 pagefault_disable();
254 do {
255 ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
256 len++;
257 } while (c && ret == 0 && len < MAX_STRING_SIZE);
258 pagefault_enable();
259 set_fs(old_fs);
260
261 if (ret < 0) /* Failed to check the length */
262 *(u32 *)dest = 0;
263 else
264 *(u32 *)dest = len;
265}
266
267/* Memory fetching by symbol */
268struct symbol_cache {
269 char *symbol;
270 long offset;
271 unsigned long addr;
272};
273
274static unsigned long update_symbol_cache(struct symbol_cache *sc)
275{
276 sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
277 if (sc->addr)
278 sc->addr += sc->offset;
279 return sc->addr;
280}
281
282static void free_symbol_cache(struct symbol_cache *sc)
283{
284 kfree(sc->symbol);
285 kfree(sc);
286}
287
288static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
289{
290 struct symbol_cache *sc;
291
292 if (!sym || strlen(sym) == 0)
293 return NULL;
294 sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
295 if (!sc)
296 return NULL;
297
298 sc->symbol = kstrdup(sym, GFP_KERNEL);
299 if (!sc->symbol) {
300 kfree(sc);
301 return NULL;
302 }
303 sc->offset = offset;
304 22
305 update_symbol_cache(sc); 23#include "trace_probe.h"
306 return sc;
307}
308
309#define DEFINE_FETCH_symbol(type) \
310static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\
311 void *data, void *dest) \
312{ \
313 struct symbol_cache *sc = data; \
314 if (sc->addr) \
315 fetch_memory_##type(regs, (void *)sc->addr, dest); \
316 else \
317 *(type *)dest = 0; \
318}
319DEFINE_BASIC_FETCH_FUNCS(symbol)
320DEFINE_FETCH_symbol(string)
321DEFINE_FETCH_symbol(string_size)
322
323/* Dereference memory access function */
324struct deref_fetch_param {
325 struct fetch_param orig;
326 long offset;
327};
328
329#define DEFINE_FETCH_deref(type) \
330static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\
331 void *data, void *dest) \
332{ \
333 struct deref_fetch_param *dprm = data; \
334 unsigned long addr; \
335 call_fetch(&dprm->orig, regs, &addr); \
336 if (addr) { \
337 addr += dprm->offset; \
338 fetch_memory_##type(regs, (void *)addr, dest); \
339 } else \
340 *(type *)dest = 0; \
341}
342DEFINE_BASIC_FETCH_FUNCS(deref)
343DEFINE_FETCH_deref(string)
344DEFINE_FETCH_deref(string_size)
345
346static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data)
347{
348 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
349 update_deref_fetch_param(data->orig.data);
350 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
351 update_symbol_cache(data->orig.data);
352}
353
354static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
355{
356 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
357 free_deref_fetch_param(data->orig.data);
358 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
359 free_symbol_cache(data->orig.data);
360 kfree(data);
361}
362
363/* Bitfield fetch function */
364struct bitfield_fetch_param {
365 struct fetch_param orig;
366 unsigned char hi_shift;
367 unsigned char low_shift;
368};
369 24
370#define DEFINE_FETCH_bitfield(type) \ 25#define KPROBE_EVENT_SYSTEM "kprobes"
371static __kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs,\
372 void *data, void *dest) \
373{ \
374 struct bitfield_fetch_param *bprm = data; \
375 type buf = 0; \
376 call_fetch(&bprm->orig, regs, &buf); \
377 if (buf) { \
378 buf <<= bprm->hi_shift; \
379 buf >>= bprm->low_shift; \
380 } \
381 *(type *)dest = buf; \
382}
383DEFINE_BASIC_FETCH_FUNCS(bitfield)
384#define fetch_bitfield_string NULL
385#define fetch_bitfield_string_size NULL
386
387static __kprobes void
388update_bitfield_fetch_param(struct bitfield_fetch_param *data)
389{
390 /*
391 * Don't check the bitfield itself, because this must be the
392 * last fetch function.
393 */
394 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
395 update_deref_fetch_param(data->orig.data);
396 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
397 update_symbol_cache(data->orig.data);
398}
399
400static __kprobes void
401free_bitfield_fetch_param(struct bitfield_fetch_param *data)
402{
403 /*
404 * Don't check the bitfield itself, because this must be the
405 * last fetch function.
406 */
407 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
408 free_deref_fetch_param(data->orig.data);
409 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
410 free_symbol_cache(data->orig.data);
411 kfree(data);
412}
413
414/* Default (unsigned long) fetch type */
415#define __DEFAULT_FETCH_TYPE(t) u##t
416#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
417#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
418#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
419
420/* Fetch types */
421enum {
422 FETCH_MTD_reg = 0,
423 FETCH_MTD_stack,
424 FETCH_MTD_retval,
425 FETCH_MTD_memory,
426 FETCH_MTD_symbol,
427 FETCH_MTD_deref,
428 FETCH_MTD_bitfield,
429 FETCH_MTD_END,
430};
431
432#define ASSIGN_FETCH_FUNC(method, type) \
433 [FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
434
435#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
436 {.name = _name, \
437 .size = _size, \
438 .is_signed = sign, \
439 .print = PRINT_TYPE_FUNC_NAME(ptype), \
440 .fmt = PRINT_TYPE_FMT_NAME(ptype), \
441 .fmttype = _fmttype, \
442 .fetch = { \
443ASSIGN_FETCH_FUNC(reg, ftype), \
444ASSIGN_FETCH_FUNC(stack, ftype), \
445ASSIGN_FETCH_FUNC(retval, ftype), \
446ASSIGN_FETCH_FUNC(memory, ftype), \
447ASSIGN_FETCH_FUNC(symbol, ftype), \
448ASSIGN_FETCH_FUNC(deref, ftype), \
449ASSIGN_FETCH_FUNC(bitfield, ftype), \
450 } \
451 }
452
453#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
454 __ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
455
456#define FETCH_TYPE_STRING 0
457#define FETCH_TYPE_STRSIZE 1
458
459/* Fetch type information table */
460static const struct fetch_type {
461 const char *name; /* Name of type */
462 size_t size; /* Byte size of type */
463 int is_signed; /* Signed flag */
464 print_type_func_t print; /* Print functions */
465 const char *fmt; /* Fromat string */
466 const char *fmttype; /* Name in format file */
467 /* Fetch functions */
468 fetch_func_t fetch[FETCH_MTD_END];
469} fetch_type_table[] = {
470 /* Special types */
471 [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
472 sizeof(u32), 1, "__data_loc char[]"),
473 [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
474 string_size, sizeof(u32), 0, "u32"),
475 /* Basic types */
476 ASSIGN_FETCH_TYPE(u8, u8, 0),
477 ASSIGN_FETCH_TYPE(u16, u16, 0),
478 ASSIGN_FETCH_TYPE(u32, u32, 0),
479 ASSIGN_FETCH_TYPE(u64, u64, 0),
480 ASSIGN_FETCH_TYPE(s8, u8, 1),
481 ASSIGN_FETCH_TYPE(s16, u16, 1),
482 ASSIGN_FETCH_TYPE(s32, u32, 1),
483 ASSIGN_FETCH_TYPE(s64, u64, 1),
484};
485
486static const struct fetch_type *find_fetch_type(const char *type)
487{
488 int i;
489
490 if (!type)
491 type = DEFAULT_FETCH_TYPE_STR;
492
493 /* Special case: bitfield */
494 if (*type == 'b') {
495 unsigned long bs;
496 type = strchr(type, '/');
497 if (!type)
498 goto fail;
499 type++;
500 if (strict_strtoul(type, 0, &bs))
501 goto fail;
502 switch (bs) {
503 case 8:
504 return find_fetch_type("u8");
505 case 16:
506 return find_fetch_type("u16");
507 case 32:
508 return find_fetch_type("u32");
509 case 64:
510 return find_fetch_type("u64");
511 default:
512 goto fail;
513 }
514 }
515
516 for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++)
517 if (strcmp(type, fetch_type_table[i].name) == 0)
518 return &fetch_type_table[i];
519fail:
520 return NULL;
521}
522
523/* Special function : only accept unsigned long */
524static __kprobes void fetch_stack_address(struct pt_regs *regs,
525 void *dummy, void *dest)
526{
527 *(unsigned long *)dest = kernel_stack_pointer(regs);
528}
529
530static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
531 fetch_func_t orig_fn)
532{
533 int i;
534
535 if (type != &fetch_type_table[FETCH_TYPE_STRING])
536 return NULL; /* Only string type needs size function */
537 for (i = 0; i < FETCH_MTD_END; i++)
538 if (type->fetch[i] == orig_fn)
539 return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
540
541 WARN_ON(1); /* This should not happen */
542 return NULL;
543}
544 26
545/** 27/**
546 * Kprobe event core functions 28 * Kprobe event core functions
547 */ 29 */
548 30
549struct probe_arg {
550 struct fetch_param fetch;
551 struct fetch_param fetch_size;
552 unsigned int offset; /* Offset from argument entry */
553 const char *name; /* Name of this argument */
554 const char *comm; /* Command of this argument */
555 const struct fetch_type *type; /* Type of this argument */
556};
557
558/* Flags for trace_probe */
559#define TP_FLAG_TRACE 1
560#define TP_FLAG_PROFILE 2
561#define TP_FLAG_REGISTERED 4
562
563struct trace_probe { 31struct trace_probe {
564 struct list_head list; 32 struct list_head list;
565 struct kretprobe rp; /* Use rp.kp for kprobe use */ 33 struct kretprobe rp; /* Use rp.kp for kprobe use */
@@ -631,18 +99,6 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
631static int kretprobe_dispatcher(struct kretprobe_instance *ri, 99static int kretprobe_dispatcher(struct kretprobe_instance *ri,
632 struct pt_regs *regs); 100 struct pt_regs *regs);
633 101
634/* Check the name is good for event/group/fields */
635static int is_good_name(const char *name)
636{
637 if (!isalpha(*name) && *name != '_')
638 return 0;
639 while (*++name != '\0') {
640 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
641 return 0;
642 }
643 return 1;
644}
645
646/* 102/*
647 * Allocate new trace_probe and initialize it (including kprobes). 103 * Allocate new trace_probe and initialize it (including kprobes).
648 */ 104 */
@@ -651,7 +107,7 @@ static struct trace_probe *alloc_trace_probe(const char *group,
651 void *addr, 107 void *addr,
652 const char *symbol, 108 const char *symbol,
653 unsigned long offs, 109 unsigned long offs,
654 int nargs, int is_return) 110 int nargs, bool is_return)
655{ 111{
656 struct trace_probe *tp; 112 struct trace_probe *tp;
657 int ret = -ENOMEM; 113 int ret = -ENOMEM;
@@ -702,34 +158,12 @@ error:
702 return ERR_PTR(ret); 158 return ERR_PTR(ret);
703} 159}
704 160
705static void update_probe_arg(struct probe_arg *arg)
706{
707 if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
708 update_bitfield_fetch_param(arg->fetch.data);
709 else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
710 update_deref_fetch_param(arg->fetch.data);
711 else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
712 update_symbol_cache(arg->fetch.data);
713}
714
715static void free_probe_arg(struct probe_arg *arg)
716{
717 if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
718 free_bitfield_fetch_param(arg->fetch.data);
719 else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
720 free_deref_fetch_param(arg->fetch.data);
721 else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
722 free_symbol_cache(arg->fetch.data);
723 kfree(arg->name);
724 kfree(arg->comm);
725}
726
727static void free_trace_probe(struct trace_probe *tp) 161static void free_trace_probe(struct trace_probe *tp)
728{ 162{
729 int i; 163 int i;
730 164
731 for (i = 0; i < tp->nr_args; i++) 165 for (i = 0; i < tp->nr_args; i++)
732 free_probe_arg(&tp->args[i]); 166 traceprobe_free_probe_arg(&tp->args[i]);
733 167
734 kfree(tp->call.class->system); 168 kfree(tp->call.class->system);
735 kfree(tp->call.name); 169 kfree(tp->call.name);
@@ -787,7 +221,7 @@ static int __register_trace_probe(struct trace_probe *tp)
787 return -EINVAL; 221 return -EINVAL;
788 222
789 for (i = 0; i < tp->nr_args; i++) 223 for (i = 0; i < tp->nr_args; i++)
790 update_probe_arg(&tp->args[i]); 224 traceprobe_update_arg(&tp->args[i]);
791 225
792 /* Set/clear disabled flag according to tp->flag */ 226 /* Set/clear disabled flag according to tp->flag */
793 if (trace_probe_is_enabled(tp)) 227 if (trace_probe_is_enabled(tp))
@@ -919,227 +353,6 @@ static struct notifier_block trace_probe_module_nb = {
919 .priority = 1 /* Invoked after kprobe module callback */ 353 .priority = 1 /* Invoked after kprobe module callback */
920}; 354};
921 355
922/* Split symbol and offset. */
923static int split_symbol_offset(char *symbol, unsigned long *offset)
924{
925 char *tmp;
926 int ret;
927
928 if (!offset)
929 return -EINVAL;
930
931 tmp = strchr(symbol, '+');
932 if (tmp) {
933 /* skip sign because strict_strtol doesn't accept '+' */
934 ret = strict_strtoul(tmp + 1, 0, offset);
935 if (ret)
936 return ret;
937 *tmp = '\0';
938 } else
939 *offset = 0;
940 return 0;
941}
942
943#define PARAM_MAX_ARGS 16
944#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
945
946static int parse_probe_vars(char *arg, const struct fetch_type *t,
947 struct fetch_param *f, int is_return)
948{
949 int ret = 0;
950 unsigned long param;
951
952 if (strcmp(arg, "retval") == 0) {
953 if (is_return)
954 f->fn = t->fetch[FETCH_MTD_retval];
955 else
956 ret = -EINVAL;
957 } else if (strncmp(arg, "stack", 5) == 0) {
958 if (arg[5] == '\0') {
959 if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR) == 0)
960 f->fn = fetch_stack_address;
961 else
962 ret = -EINVAL;
963 } else if (isdigit(arg[5])) {
964 ret = strict_strtoul(arg + 5, 10, &param);
965 if (ret || param > PARAM_MAX_STACK)
966 ret = -EINVAL;
967 else {
968 f->fn = t->fetch[FETCH_MTD_stack];
969 f->data = (void *)param;
970 }
971 } else
972 ret = -EINVAL;
973 } else
974 ret = -EINVAL;
975 return ret;
976}
977
978/* Recursive argument parser */
979static int __parse_probe_arg(char *arg, const struct fetch_type *t,
980 struct fetch_param *f, int is_return)
981{
982 int ret = 0;
983 unsigned long param;
984 long offset;
985 char *tmp;
986
987 switch (arg[0]) {
988 case '$':
989 ret = parse_probe_vars(arg + 1, t, f, is_return);
990 break;
991 case '%': /* named register */
992 ret = regs_query_register_offset(arg + 1);
993 if (ret >= 0) {
994 f->fn = t->fetch[FETCH_MTD_reg];
995 f->data = (void *)(unsigned long)ret;
996 ret = 0;
997 }
998 break;
999 case '@': /* memory or symbol */
1000 if (isdigit(arg[1])) {
1001 ret = strict_strtoul(arg + 1, 0, &param);
1002 if (ret)
1003 break;
1004 f->fn = t->fetch[FETCH_MTD_memory];
1005 f->data = (void *)param;
1006 } else {
1007 ret = split_symbol_offset(arg + 1, &offset);
1008 if (ret)
1009 break;
1010 f->data = alloc_symbol_cache(arg + 1, offset);
1011 if (f->data)
1012 f->fn = t->fetch[FETCH_MTD_symbol];
1013 }
1014 break;
1015 case '+': /* deref memory */
1016 arg++; /* Skip '+', because strict_strtol() rejects it. */
1017 case '-':
1018 tmp = strchr(arg, '(');
1019 if (!tmp)
1020 break;
1021 *tmp = '\0';
1022 ret = strict_strtol(arg, 0, &offset);
1023 if (ret)
1024 break;
1025 arg = tmp + 1;
1026 tmp = strrchr(arg, ')');
1027 if (tmp) {
1028 struct deref_fetch_param *dprm;
1029 const struct fetch_type *t2 = find_fetch_type(NULL);
1030 *tmp = '\0';
1031 dprm = kzalloc(sizeof(struct deref_fetch_param),
1032 GFP_KERNEL);
1033 if (!dprm)
1034 return -ENOMEM;
1035 dprm->offset = offset;
1036 ret = __parse_probe_arg(arg, t2, &dprm->orig,
1037 is_return);
1038 if (ret)
1039 kfree(dprm);
1040 else {
1041 f->fn = t->fetch[FETCH_MTD_deref];
1042 f->data = (void *)dprm;
1043 }
1044 }
1045 break;
1046 }
1047 if (!ret && !f->fn) { /* Parsed, but do not find fetch method */
1048 pr_info("%s type has no corresponding fetch method.\n",
1049 t->name);
1050 ret = -EINVAL;
1051 }
1052 return ret;
1053}
1054
1055#define BYTES_TO_BITS(nb) ((BITS_PER_LONG * (nb)) / sizeof(long))
1056
1057/* Bitfield type needs to be parsed into a fetch function */
1058static int __parse_bitfield_probe_arg(const char *bf,
1059 const struct fetch_type *t,
1060 struct fetch_param *f)
1061{
1062 struct bitfield_fetch_param *bprm;
1063 unsigned long bw, bo;
1064 char *tail;
1065
1066 if (*bf != 'b')
1067 return 0;
1068
1069 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1070 if (!bprm)
1071 return -ENOMEM;
1072 bprm->orig = *f;
1073 f->fn = t->fetch[FETCH_MTD_bitfield];
1074 f->data = (void *)bprm;
1075
1076 bw = simple_strtoul(bf + 1, &tail, 0); /* Use simple one */
1077 if (bw == 0 || *tail != '@')
1078 return -EINVAL;
1079
1080 bf = tail + 1;
1081 bo = simple_strtoul(bf, &tail, 0);
1082 if (tail == bf || *tail != '/')
1083 return -EINVAL;
1084
1085 bprm->hi_shift = BYTES_TO_BITS(t->size) - (bw + bo);
1086 bprm->low_shift = bprm->hi_shift + bo;
1087 return (BYTES_TO_BITS(t->size) < (bw + bo)) ? -EINVAL : 0;
1088}
1089
1090/* String length checking wrapper */
1091static int parse_probe_arg(char *arg, struct trace_probe *tp,
1092 struct probe_arg *parg, int is_return)
1093{
1094 const char *t;
1095 int ret;
1096
1097 if (strlen(arg) > MAX_ARGSTR_LEN) {
1098 pr_info("Argument is too long.: %s\n", arg);
1099 return -ENOSPC;
1100 }
1101 parg->comm = kstrdup(arg, GFP_KERNEL);
1102 if (!parg->comm) {
1103 pr_info("Failed to allocate memory for command '%s'.\n", arg);
1104 return -ENOMEM;
1105 }
1106 t = strchr(parg->comm, ':');
1107 if (t) {
1108 arg[t - parg->comm] = '\0';
1109 t++;
1110 }
1111 parg->type = find_fetch_type(t);
1112 if (!parg->type) {
1113 pr_info("Unsupported type: %s\n", t);
1114 return -EINVAL;
1115 }
1116 parg->offset = tp->size;
1117 tp->size += parg->type->size;
1118 ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
1119 if (ret >= 0 && t != NULL)
1120 ret = __parse_bitfield_probe_arg(t, parg->type, &parg->fetch);
1121 if (ret >= 0) {
1122 parg->fetch_size.fn = get_fetch_size_function(parg->type,
1123 parg->fetch.fn);
1124 parg->fetch_size.data = parg->fetch.data;
1125 }
1126 return ret;
1127}
1128
1129/* Return 1 if name is reserved or already used by another argument */
1130static int conflict_field_name(const char *name,
1131 struct probe_arg *args, int narg)
1132{
1133 int i;
1134 for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++)
1135 if (strcmp(reserved_field_names[i], name) == 0)
1136 return 1;
1137 for (i = 0; i < narg; i++)
1138 if (strcmp(args[i].name, name) == 0)
1139 return 1;
1140 return 0;
1141}
1142
1143static int create_trace_probe(int argc, char **argv) 356static int create_trace_probe(int argc, char **argv)
1144{ 357{
1145 /* 358 /*
@@ -1162,7 +375,7 @@ static int create_trace_probe(int argc, char **argv)
1162 */ 375 */
1163 struct trace_probe *tp; 376 struct trace_probe *tp;
1164 int i, ret = 0; 377 int i, ret = 0;
1165 int is_return = 0, is_delete = 0; 378 bool is_return = false, is_delete = false;
1166 char *symbol = NULL, *event = NULL, *group = NULL; 379 char *symbol = NULL, *event = NULL, *group = NULL;
1167 char *arg; 380 char *arg;
1168 unsigned long offset = 0; 381 unsigned long offset = 0;
@@ -1171,11 +384,11 @@ static int create_trace_probe(int argc, char **argv)
1171 384
1172 /* argc must be >= 1 */ 385 /* argc must be >= 1 */
1173 if (argv[0][0] == 'p') 386 if (argv[0][0] == 'p')
1174 is_return = 0; 387 is_return = false;
1175 else if (argv[0][0] == 'r') 388 else if (argv[0][0] == 'r')
1176 is_return = 1; 389 is_return = true;
1177 else if (argv[0][0] == '-') 390 else if (argv[0][0] == '-')
1178 is_delete = 1; 391 is_delete = true;
1179 else { 392 else {
1180 pr_info("Probe definition must be started with 'p', 'r' or" 393 pr_info("Probe definition must be started with 'p', 'r' or"
1181 " '-'.\n"); 394 " '-'.\n");
@@ -1240,7 +453,7 @@ static int create_trace_probe(int argc, char **argv)
1240 /* a symbol specified */ 453 /* a symbol specified */
1241 symbol = argv[1]; 454 symbol = argv[1];
1242 /* TODO: support .init module functions */ 455 /* TODO: support .init module functions */
1243 ret = split_symbol_offset(symbol, &offset); 456 ret = traceprobe_split_symbol_offset(symbol, &offset);
1244 if (ret) { 457 if (ret) {
1245 pr_info("Failed to parse symbol.\n"); 458 pr_info("Failed to parse symbol.\n");
1246 return ret; 459 return ret;
@@ -1302,7 +515,8 @@ static int create_trace_probe(int argc, char **argv)
1302 goto error; 515 goto error;
1303 } 516 }
1304 517
1305 if (conflict_field_name(tp->args[i].name, tp->args, i)) { 518 if (traceprobe_conflict_field_name(tp->args[i].name,
519 tp->args, i)) {
1306 pr_info("Argument[%d] name '%s' conflicts with " 520 pr_info("Argument[%d] name '%s' conflicts with "
1307 "another field.\n", i, argv[i]); 521 "another field.\n", i, argv[i]);
1308 ret = -EINVAL; 522 ret = -EINVAL;
@@ -1310,7 +524,8 @@ static int create_trace_probe(int argc, char **argv)
1310 } 524 }
1311 525
1312 /* Parse fetch argument */ 526 /* Parse fetch argument */
1313 ret = parse_probe_arg(arg, tp, &tp->args[i], is_return); 527 ret = traceprobe_parse_probe_arg(arg, &tp->size, &tp->args[i],
528 is_return, true);
1314 if (ret) { 529 if (ret) {
1315 pr_info("Parse error at argument[%d]. (%d)\n", i, ret); 530 pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
1316 goto error; 531 goto error;
@@ -1412,70 +627,11 @@ static int probes_open(struct inode *inode, struct file *file)
1412 return seq_open(file, &probes_seq_op); 627 return seq_open(file, &probes_seq_op);
1413} 628}
1414 629
1415static int command_trace_probe(const char *buf)
1416{
1417 char **argv;
1418 int argc = 0, ret = 0;
1419
1420 argv = argv_split(GFP_KERNEL, buf, &argc);
1421 if (!argv)
1422 return -ENOMEM;
1423
1424 if (argc)
1425 ret = create_trace_probe(argc, argv);
1426
1427 argv_free(argv);
1428 return ret;
1429}
1430
1431#define WRITE_BUFSIZE 4096
1432
1433static ssize_t probes_write(struct file *file, const char __user *buffer, 630static ssize_t probes_write(struct file *file, const char __user *buffer,
1434 size_t count, loff_t *ppos) 631 size_t count, loff_t *ppos)
1435{ 632{
1436 char *kbuf, *tmp; 633 return traceprobe_probes_write(file, buffer, count, ppos,
1437 int ret; 634 create_trace_probe);
1438 size_t done;
1439 size_t size;
1440
1441 kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL);
1442 if (!kbuf)
1443 return -ENOMEM;
1444
1445 ret = done = 0;
1446 while (done < count) {
1447 size = count - done;
1448 if (size >= WRITE_BUFSIZE)
1449 size = WRITE_BUFSIZE - 1;
1450 if (copy_from_user(kbuf, buffer + done, size)) {
1451 ret = -EFAULT;
1452 goto out;
1453 }
1454 kbuf[size] = '\0';
1455 tmp = strchr(kbuf, '\n');
1456 if (tmp) {
1457 *tmp = '\0';
1458 size = tmp - kbuf + 1;
1459 } else if (done + size < count) {
1460 pr_warning("Line length is too long: "
1461 "Should be less than %d.", WRITE_BUFSIZE);
1462 ret = -EINVAL;
1463 goto out;
1464 }
1465 done += size;
1466 /* Remove comments */
1467 tmp = strchr(kbuf, '#');
1468 if (tmp)
1469 *tmp = '\0';
1470
1471 ret = command_trace_probe(kbuf);
1472 if (ret)
1473 goto out;
1474 }
1475 ret = done;
1476out:
1477 kfree(kbuf);
1478 return ret;
1479} 635}
1480 636
1481static const struct file_operations kprobe_events_ops = { 637static const struct file_operations kprobe_events_ops = {
@@ -1711,16 +867,6 @@ partial:
1711 return TRACE_TYPE_PARTIAL_LINE; 867 return TRACE_TYPE_PARTIAL_LINE;
1712} 868}
1713 869
1714#undef DEFINE_FIELD
1715#define DEFINE_FIELD(type, item, name, is_signed) \
1716 do { \
1717 ret = trace_define_field(event_call, #type, name, \
1718 offsetof(typeof(field), item), \
1719 sizeof(field.item), is_signed, \
1720 FILTER_OTHER); \
1721 if (ret) \
1722 return ret; \
1723 } while (0)
1724 870
1725static int kprobe_event_define_fields(struct ftrace_event_call *event_call) 871static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
1726{ 872{
@@ -2051,8 +1197,9 @@ static __init int kprobe_trace_self_tests_init(void)
2051 1197
2052 pr_info("Testing kprobe tracing: "); 1198 pr_info("Testing kprobe tracing: ");
2053 1199
2054 ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target " 1200 ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target "
2055 "$stack $stack0 +0($stack)"); 1201 "$stack $stack0 +0($stack)",
1202 create_trace_probe);
2056 if (WARN_ON_ONCE(ret)) { 1203 if (WARN_ON_ONCE(ret)) {
2057 pr_warning("error on probing function entry.\n"); 1204 pr_warning("error on probing function entry.\n");
2058 warn++; 1205 warn++;
@@ -2066,8 +1213,8 @@ static __init int kprobe_trace_self_tests_init(void)
2066 enable_trace_probe(tp, TP_FLAG_TRACE); 1213 enable_trace_probe(tp, TP_FLAG_TRACE);
2067 } 1214 }
2068 1215
2069 ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target " 1216 ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target "
2070 "$retval"); 1217 "$retval", create_trace_probe);
2071 if (WARN_ON_ONCE(ret)) { 1218 if (WARN_ON_ONCE(ret)) {
2072 pr_warning("error on probing function return.\n"); 1219 pr_warning("error on probing function return.\n");
2073 warn++; 1220 warn++;
@@ -2101,13 +1248,13 @@ static __init int kprobe_trace_self_tests_init(void)
2101 } else 1248 } else
2102 disable_trace_probe(tp, TP_FLAG_TRACE); 1249 disable_trace_probe(tp, TP_FLAG_TRACE);
2103 1250
2104 ret = command_trace_probe("-:testprobe"); 1251 ret = traceprobe_command("-:testprobe", create_trace_probe);
2105 if (WARN_ON_ONCE(ret)) { 1252 if (WARN_ON_ONCE(ret)) {
2106 pr_warning("error on deleting a probe.\n"); 1253 pr_warning("error on deleting a probe.\n");
2107 warn++; 1254 warn++;
2108 } 1255 }
2109 1256
2110 ret = command_trace_probe("-:testprobe2"); 1257 ret = traceprobe_command("-:testprobe2", create_trace_probe);
2111 if (WARN_ON_ONCE(ret)) { 1258 if (WARN_ON_ONCE(ret)) {
2112 pr_warning("error on deleting a probe.\n"); 1259 pr_warning("error on deleting a probe.\n");
2113 warn++; 1260 warn++;
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-08 19:16:44 -0500