1 //===-- dfsan.cc ----------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file is a part of DataFlowSanitizer.
11 //
12 // This file defines the custom functions listed in done_abilist.txt.
13 //===----------------------------------------------------------------------===//
14
15 #include "sanitizer_common/sanitizer_common.h"
16 #include "sanitizer_common/sanitizer_internal_defs.h"
17 #include "sanitizer_common/sanitizer_linux.h"
18
19 #include "dfsan/dfsan.h"
20
21 #include <arpa/inet.h>
22 #include <assert.h>
23 #include <ctype.h>
24 #include <dlfcn.h>
25 #include <link.h>
26 #include <poll.h>
27 #include <pthread.h>
28 #include <pwd.h>
29 #include <sched.h>
30 #include <signal.h>
31 #include <stdarg.h>
32 #include <stdint.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <sys/resource.h>
37 #include <sys/select.h>
38 #include <sys/stat.h>
39 #include <sys/time.h>
40 #include <sys/types.h>
41 #include <time.h>
42 #include <unistd.h>
43
44 using namespace __dfsan;
45
46 extern "C" {
47 SANITIZER_INTERFACE_ATTRIBUTE int
__dfsw_stat(const char * path,struct stat * buf,dfsan_label path_label,dfsan_label buf_label,dfsan_label * ret_label)48 __dfsw_stat(const char *path, struct stat *buf, dfsan_label path_label,
49 dfsan_label buf_label, dfsan_label *ret_label) {
50 int ret = stat(path, buf);
51 if (ret == 0)
52 dfsan_set_label(0, buf, sizeof(struct stat));
53 *ret_label = 0;
54 return ret;
55 }
56
__dfsw_fstat(int fd,struct stat * buf,dfsan_label fd_label,dfsan_label buf_label,dfsan_label * ret_label)57 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_fstat(int fd, struct stat *buf,
58 dfsan_label fd_label,
59 dfsan_label buf_label,
60 dfsan_label *ret_label) {
61 int ret = fstat(fd, buf);
62 if (ret == 0)
63 dfsan_set_label(0, buf, sizeof(struct stat));
64 *ret_label = 0;
65 return ret;
66 }
67
__dfsw_strchr(const char * s,int c,dfsan_label s_label,dfsan_label c_label,dfsan_label * ret_label)68 SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strchr(const char *s, int c,
69 dfsan_label s_label,
70 dfsan_label c_label,
71 dfsan_label *ret_label) {
72 for (size_t i = 0;; ++i) {
73 if (s[i] == c || s[i] == 0) {
74 if (flags().strict_data_dependencies) {
75 *ret_label = s_label;
76 } else {
77 *ret_label = dfsan_union(dfsan_read_label(s, i + 1),
78 dfsan_union(s_label, c_label));
79 }
80 return s[i] == 0 ? 0 : const_cast<char *>(s+i);
81 }
82 }
83 }
84
__dfsw_memcmp(const void * s1,const void * s2,size_t n,dfsan_label s1_label,dfsan_label s2_label,dfsan_label n_label,dfsan_label * ret_label)85 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_memcmp(const void *s1, const void *s2,
86 size_t n, dfsan_label s1_label,
87 dfsan_label s2_label,
88 dfsan_label n_label,
89 dfsan_label *ret_label) {
90 const char *cs1 = (const char *) s1, *cs2 = (const char *) s2;
91 for (size_t i = 0; i != n; ++i) {
92 if (cs1[i] != cs2[i]) {
93 if (flags().strict_data_dependencies) {
94 *ret_label = 0;
95 } else {
96 *ret_label = dfsan_union(dfsan_read_label(cs1, i + 1),
97 dfsan_read_label(cs2, i + 1));
98 }
99 return cs1[i] - cs2[i];
100 }
101 }
102
103 if (flags().strict_data_dependencies) {
104 *ret_label = 0;
105 } else {
106 *ret_label = dfsan_union(dfsan_read_label(cs1, n),
107 dfsan_read_label(cs2, n));
108 }
109 return 0;
110 }
111
__dfsw_strcmp(const char * s1,const char * s2,dfsan_label s1_label,dfsan_label s2_label,dfsan_label * ret_label)112 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strcmp(const char *s1, const char *s2,
113 dfsan_label s1_label,
114 dfsan_label s2_label,
115 dfsan_label *ret_label) {
116 for (size_t i = 0;; ++i) {
117 if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0) {
118 if (flags().strict_data_dependencies) {
119 *ret_label = 0;
120 } else {
121 *ret_label = dfsan_union(dfsan_read_label(s1, i + 1),
122 dfsan_read_label(s2, i + 1));
123 }
124 return s1[i] - s2[i];
125 }
126 }
127 return 0;
128 }
129
130 SANITIZER_INTERFACE_ATTRIBUTE int
__dfsw_strcasecmp(const char * s1,const char * s2,dfsan_label s1_label,dfsan_label s2_label,dfsan_label * ret_label)131 __dfsw_strcasecmp(const char *s1, const char *s2, dfsan_label s1_label,
132 dfsan_label s2_label, dfsan_label *ret_label) {
133 for (size_t i = 0;; ++i) {
134 if (tolower(s1[i]) != tolower(s2[i]) || s1[i] == 0 || s2[i] == 0) {
135 if (flags().strict_data_dependencies) {
136 *ret_label = 0;
137 } else {
138 *ret_label = dfsan_union(dfsan_read_label(s1, i + 1),
139 dfsan_read_label(s2, i + 1));
140 }
141 return s1[i] - s2[i];
142 }
143 }
144 return 0;
145 }
146
__dfsw_strncmp(const char * s1,const char * s2,size_t n,dfsan_label s1_label,dfsan_label s2_label,dfsan_label n_label,dfsan_label * ret_label)147 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strncmp(const char *s1, const char *s2,
148 size_t n, dfsan_label s1_label,
149 dfsan_label s2_label,
150 dfsan_label n_label,
151 dfsan_label *ret_label) {
152 if (n == 0) {
153 *ret_label = 0;
154 return 0;
155 }
156
157 for (size_t i = 0;; ++i) {
158 if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0 || i == n - 1) {
159 if (flags().strict_data_dependencies) {
160 *ret_label = 0;
161 } else {
162 *ret_label = dfsan_union(dfsan_read_label(s1, i + 1),
163 dfsan_read_label(s2, i + 1));
164 }
165 return s1[i] - s2[i];
166 }
167 }
168 return 0;
169 }
170
171 SANITIZER_INTERFACE_ATTRIBUTE int
__dfsw_strncasecmp(const char * s1,const char * s2,size_t n,dfsan_label s1_label,dfsan_label s2_label,dfsan_label n_label,dfsan_label * ret_label)172 __dfsw_strncasecmp(const char *s1, const char *s2, size_t n,
173 dfsan_label s1_label, dfsan_label s2_label,
174 dfsan_label n_label, dfsan_label *ret_label) {
175 if (n == 0) {
176 *ret_label = 0;
177 return 0;
178 }
179
180 for (size_t i = 0;; ++i) {
181 if (tolower(s1[i]) != tolower(s2[i]) || s1[i] == 0 || s2[i] == 0 ||
182 i == n - 1) {
183 if (flags().strict_data_dependencies) {
184 *ret_label = 0;
185 } else {
186 *ret_label = dfsan_union(dfsan_read_label(s1, i + 1),
187 dfsan_read_label(s2, i + 1));
188 }
189 return s1[i] - s2[i];
190 }
191 }
192 return 0;
193 }
194
__dfsw_calloc(size_t nmemb,size_t size,dfsan_label nmemb_label,dfsan_label size_label,dfsan_label * ret_label)195 SANITIZER_INTERFACE_ATTRIBUTE void *__dfsw_calloc(size_t nmemb, size_t size,
196 dfsan_label nmemb_label,
197 dfsan_label size_label,
198 dfsan_label *ret_label) {
199 void *p = calloc(nmemb, size);
200 dfsan_set_label(0, p, nmemb * size);
201 *ret_label = 0;
202 return p;
203 }
204
205 SANITIZER_INTERFACE_ATTRIBUTE size_t
__dfsw_strlen(const char * s,dfsan_label s_label,dfsan_label * ret_label)206 __dfsw_strlen(const char *s, dfsan_label s_label, dfsan_label *ret_label) {
207 size_t ret = strlen(s);
208 if (flags().strict_data_dependencies) {
209 *ret_label = 0;
210 } else {
211 *ret_label = dfsan_read_label(s, ret + 1);
212 }
213 return ret;
214 }
215
216
dfsan_memcpy(void * dest,const void * src,size_t n)217 static void *dfsan_memcpy(void *dest, const void *src, size_t n) {
218 dfsan_label *sdest = shadow_for(dest);
219 const dfsan_label *ssrc = shadow_for(src);
220 internal_memcpy((void *)sdest, (const void *)ssrc, n * sizeof(dfsan_label));
221 return internal_memcpy(dest, src, n);
222 }
223
dfsan_memset(void * s,int c,dfsan_label c_label,size_t n)224 static void dfsan_memset(void *s, int c, dfsan_label c_label, size_t n) {
225 internal_memset(s, c, n);
226 dfsan_set_label(c_label, s, n);
227 }
228
229 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_memcpy(void * dest,const void * src,size_t n,dfsan_label dest_label,dfsan_label src_label,dfsan_label n_label,dfsan_label * ret_label)230 void *__dfsw_memcpy(void *dest, const void *src, size_t n,
231 dfsan_label dest_label, dfsan_label src_label,
232 dfsan_label n_label, dfsan_label *ret_label) {
233 *ret_label = dest_label;
234 return dfsan_memcpy(dest, src, n);
235 }
236
237 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_memset(void * s,int c,size_t n,dfsan_label s_label,dfsan_label c_label,dfsan_label n_label,dfsan_label * ret_label)238 void *__dfsw_memset(void *s, int c, size_t n,
239 dfsan_label s_label, dfsan_label c_label,
240 dfsan_label n_label, dfsan_label *ret_label) {
241 dfsan_memset(s, c, c_label, n);
242 *ret_label = s_label;
243 return s;
244 }
245
246 SANITIZER_INTERFACE_ATTRIBUTE char *
__dfsw_strdup(const char * s,dfsan_label s_label,dfsan_label * ret_label)247 __dfsw_strdup(const char *s, dfsan_label s_label, dfsan_label *ret_label) {
248 size_t len = strlen(s);
249 void *p = malloc(len+1);
250 dfsan_memcpy(p, s, len+1);
251 *ret_label = 0;
252 return static_cast<char *>(p);
253 }
254
255 SANITIZER_INTERFACE_ATTRIBUTE char *
__dfsw_strncpy(char * s1,const char * s2,size_t n,dfsan_label s1_label,dfsan_label s2_label,dfsan_label n_label,dfsan_label * ret_label)256 __dfsw_strncpy(char *s1, const char *s2, size_t n, dfsan_label s1_label,
257 dfsan_label s2_label, dfsan_label n_label,
258 dfsan_label *ret_label) {
259 size_t len = strlen(s2);
260 if (len < n) {
261 dfsan_memcpy(s1, s2, len+1);
262 dfsan_memset(s1+len+1, 0, 0, n-len-1);
263 } else {
264 dfsan_memcpy(s1, s2, n);
265 }
266
267 *ret_label = s1_label;
268 return s1;
269 }
270
271 SANITIZER_INTERFACE_ATTRIBUTE ssize_t
__dfsw_pread(int fd,void * buf,size_t count,off_t offset,dfsan_label fd_label,dfsan_label buf_label,dfsan_label count_label,dfsan_label offset_label,dfsan_label * ret_label)272 __dfsw_pread(int fd, void *buf, size_t count, off_t offset,
273 dfsan_label fd_label, dfsan_label buf_label,
274 dfsan_label count_label, dfsan_label offset_label,
275 dfsan_label *ret_label) {
276 ssize_t ret = pread(fd, buf, count, offset);
277 if (ret > 0)
278 dfsan_set_label(0, buf, ret);
279 *ret_label = 0;
280 return ret;
281 }
282
283 SANITIZER_INTERFACE_ATTRIBUTE ssize_t
__dfsw_read(int fd,void * buf,size_t count,dfsan_label fd_label,dfsan_label buf_label,dfsan_label count_label,dfsan_label * ret_label)284 __dfsw_read(int fd, void *buf, size_t count,
285 dfsan_label fd_label, dfsan_label buf_label,
286 dfsan_label count_label,
287 dfsan_label *ret_label) {
288 ssize_t ret = read(fd, buf, count);
289 if (ret > 0)
290 dfsan_set_label(0, buf, ret);
291 *ret_label = 0;
292 return ret;
293 }
294
__dfsw_clock_gettime(clockid_t clk_id,struct timespec * tp,dfsan_label clk_id_label,dfsan_label tp_label,dfsan_label * ret_label)295 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_clock_gettime(clockid_t clk_id,
296 struct timespec *tp,
297 dfsan_label clk_id_label,
298 dfsan_label tp_label,
299 dfsan_label *ret_label) {
300 int ret = clock_gettime(clk_id, tp);
301 if (ret == 0)
302 dfsan_set_label(0, tp, sizeof(struct timespec));
303 *ret_label = 0;
304 return ret;
305 }
306
unpoison(const void * ptr,uptr size)307 static void unpoison(const void *ptr, uptr size) {
308 dfsan_set_label(0, const_cast<void *>(ptr), size);
309 }
310
311 // dlopen() ultimately calls mmap() down inside the loader, which generally
312 // doesn't participate in dynamic symbol resolution. Therefore we won't
313 // intercept its calls to mmap, and we have to hook it here.
314 SANITIZER_INTERFACE_ATTRIBUTE void *
__dfsw_dlopen(const char * filename,int flag,dfsan_label filename_label,dfsan_label flag_label,dfsan_label * ret_label)315 __dfsw_dlopen(const char *filename, int flag, dfsan_label filename_label,
316 dfsan_label flag_label, dfsan_label *ret_label) {
317 void *handle = dlopen(filename, flag);
318 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE(handle);
319 if (map)
320 ForEachMappedRegion(map, unpoison);
321 *ret_label = 0;
322 return handle;
323 }
324
325 struct pthread_create_info {
326 void *(*start_routine_trampoline)(void *, void *, dfsan_label, dfsan_label *);
327 void *start_routine;
328 void *arg;
329 };
330
pthread_create_cb(void * p)331 static void *pthread_create_cb(void *p) {
332 pthread_create_info pci(*(pthread_create_info *)p);
333 free(p);
334 dfsan_label ret_label;
335 return pci.start_routine_trampoline(pci.start_routine, pci.arg, 0,
336 &ret_label);
337 }
338
__dfsw_pthread_create(pthread_t * thread,const pthread_attr_t * attr,void * (* start_routine_trampoline)(void *,void *,dfsan_label,dfsan_label *),void * start_routine,void * arg,dfsan_label thread_label,dfsan_label attr_label,dfsan_label start_routine_label,dfsan_label arg_label,dfsan_label * ret_label)339 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_pthread_create(
340 pthread_t *thread, const pthread_attr_t *attr,
341 void *(*start_routine_trampoline)(void *, void *, dfsan_label,
342 dfsan_label *),
343 void *start_routine, void *arg, dfsan_label thread_label,
344 dfsan_label attr_label, dfsan_label start_routine_label,
345 dfsan_label arg_label, dfsan_label *ret_label) {
346 pthread_create_info *pci =
347 (pthread_create_info *)malloc(sizeof(pthread_create_info));
348 pci->start_routine_trampoline = start_routine_trampoline;
349 pci->start_routine = start_routine;
350 pci->arg = arg;
351 int rv = pthread_create(thread, attr, pthread_create_cb, (void *)pci);
352 if (rv != 0)
353 free(pci);
354 *ret_label = 0;
355 return rv;
356 }
357
358 struct dl_iterate_phdr_info {
359 int (*callback_trampoline)(void *callback, struct dl_phdr_info *info,
360 size_t size, void *data, dfsan_label info_label,
361 dfsan_label size_label, dfsan_label data_label,
362 dfsan_label *ret_label);
363 void *callback;
364 void *data;
365 };
366
dl_iterate_phdr_cb(struct dl_phdr_info * info,size_t size,void * data)367 int dl_iterate_phdr_cb(struct dl_phdr_info *info, size_t size, void *data) {
368 dl_iterate_phdr_info *dipi = (dl_iterate_phdr_info *)data;
369 dfsan_set_label(0, *info);
370 dfsan_set_label(0, const_cast<char *>(info->dlpi_name),
371 strlen(info->dlpi_name) + 1);
372 dfsan_set_label(
373 0, const_cast<char *>(reinterpret_cast<const char *>(info->dlpi_phdr)),
374 sizeof(*info->dlpi_phdr) * info->dlpi_phnum);
375 dfsan_label ret_label;
376 return dipi->callback_trampoline(dipi->callback, info, size, dipi->data, 0, 0,
377 0, &ret_label);
378 }
379
__dfsw_dl_iterate_phdr(int (* callback_trampoline)(void * callback,struct dl_phdr_info * info,size_t size,void * data,dfsan_label info_label,dfsan_label size_label,dfsan_label data_label,dfsan_label * ret_label),void * callback,void * data,dfsan_label callback_label,dfsan_label data_label,dfsan_label * ret_label)380 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_dl_iterate_phdr(
381 int (*callback_trampoline)(void *callback, struct dl_phdr_info *info,
382 size_t size, void *data, dfsan_label info_label,
383 dfsan_label size_label, dfsan_label data_label,
384 dfsan_label *ret_label),
385 void *callback, void *data, dfsan_label callback_label,
386 dfsan_label data_label, dfsan_label *ret_label) {
387 dl_iterate_phdr_info dipi = { callback_trampoline, callback, data };
388 *ret_label = 0;
389 return dl_iterate_phdr(dl_iterate_phdr_cb, &dipi);
390 }
391
392 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_ctime_r(const time_t * timep,char * buf,dfsan_label timep_label,dfsan_label buf_label,dfsan_label * ret_label)393 char *__dfsw_ctime_r(const time_t *timep, char *buf, dfsan_label timep_label,
394 dfsan_label buf_label, dfsan_label *ret_label) {
395 char *ret = ctime_r(timep, buf);
396 if (ret) {
397 dfsan_set_label(dfsan_read_label(timep, sizeof(time_t)), buf,
398 strlen(buf) + 1);
399 *ret_label = buf_label;
400 } else {
401 *ret_label = 0;
402 }
403 return ret;
404 }
405
406 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_fgets(char * s,int size,FILE * stream,dfsan_label s_label,dfsan_label size_label,dfsan_label stream_label,dfsan_label * ret_label)407 char *__dfsw_fgets(char *s, int size, FILE *stream, dfsan_label s_label,
408 dfsan_label size_label, dfsan_label stream_label,
409 dfsan_label *ret_label) {
410 char *ret = fgets(s, size, stream);
411 if (ret) {
412 dfsan_set_label(0, ret, strlen(ret) + 1);
413 *ret_label = s_label;
414 } else {
415 *ret_label = 0;
416 }
417 return ret;
418 }
419
420 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_getcwd(char * buf,size_t size,dfsan_label buf_label,dfsan_label size_label,dfsan_label * ret_label)421 char *__dfsw_getcwd(char *buf, size_t size, dfsan_label buf_label,
422 dfsan_label size_label, dfsan_label *ret_label) {
423 char *ret = getcwd(buf, size);
424 if (ret) {
425 dfsan_set_label(0, ret, strlen(ret) + 1);
426 *ret_label = buf_label;
427 } else {
428 *ret_label = 0;
429 }
430 return ret;
431 }
432
433 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_get_current_dir_name(dfsan_label * ret_label)434 char *__dfsw_get_current_dir_name(dfsan_label *ret_label) {
435 char *ret = get_current_dir_name();
436 if (ret) {
437 dfsan_set_label(0, ret, strlen(ret) + 1);
438 }
439 *ret_label = 0;
440 return ret;
441 }
442
443 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_gethostname(char * name,size_t len,dfsan_label name_label,dfsan_label len_label,dfsan_label * ret_label)444 int __dfsw_gethostname(char *name, size_t len, dfsan_label name_label,
445 dfsan_label len_label, dfsan_label *ret_label) {
446 int ret = gethostname(name, len);
447 if (ret == 0) {
448 dfsan_set_label(0, name, strlen(name) + 1);
449 }
450 *ret_label = 0;
451 return ret;
452 }
453
454 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_getrlimit(int resource,struct rlimit * rlim,dfsan_label resource_label,dfsan_label rlim_label,dfsan_label * ret_label)455 int __dfsw_getrlimit(int resource, struct rlimit *rlim,
456 dfsan_label resource_label, dfsan_label rlim_label,
457 dfsan_label *ret_label) {
458 int ret = getrlimit(resource, rlim);
459 if (ret == 0) {
460 dfsan_set_label(0, rlim, sizeof(struct rlimit));
461 }
462 *ret_label = 0;
463 return ret;
464 }
465
466 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_getrusage(int who,struct rusage * usage,dfsan_label who_label,dfsan_label usage_label,dfsan_label * ret_label)467 int __dfsw_getrusage(int who, struct rusage *usage, dfsan_label who_label,
468 dfsan_label usage_label, dfsan_label *ret_label) {
469 int ret = getrusage(who, usage);
470 if (ret == 0) {
471 dfsan_set_label(0, usage, sizeof(struct rusage));
472 }
473 *ret_label = 0;
474 return ret;
475 }
476
477 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_strcpy(char * dest,const char * src,dfsan_label dst_label,dfsan_label src_label,dfsan_label * ret_label)478 char *__dfsw_strcpy(char *dest, const char *src, dfsan_label dst_label,
479 dfsan_label src_label, dfsan_label *ret_label) {
480 char *ret = strcpy(dest, src);
481 if (ret) {
482 internal_memcpy(shadow_for(dest), shadow_for(src),
483 sizeof(dfsan_label) * (strlen(src) + 1));
484 }
485 *ret_label = dst_label;
486 return ret;
487 }
488
489 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_strtol(const char * nptr,char ** endptr,int base,dfsan_label nptr_label,dfsan_label endptr_label,dfsan_label base_label,dfsan_label * ret_label)490 long int __dfsw_strtol(const char *nptr, char **endptr, int base,
491 dfsan_label nptr_label, dfsan_label endptr_label,
492 dfsan_label base_label, dfsan_label *ret_label) {
493 char *tmp_endptr;
494 long int ret = strtol(nptr, &tmp_endptr, base);
495 if (endptr) {
496 *endptr = tmp_endptr;
497 }
498 if (tmp_endptr > nptr) {
499 // If *tmp_endptr is '\0' include its label as well.
500 *ret_label = dfsan_union(
501 base_label,
502 dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1)));
503 } else {
504 *ret_label = 0;
505 }
506 return ret;
507 }
508
509 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_strtod(const char * nptr,char ** endptr,dfsan_label nptr_label,dfsan_label endptr_label,dfsan_label * ret_label)510 double __dfsw_strtod(const char *nptr, char **endptr,
511 dfsan_label nptr_label, dfsan_label endptr_label,
512 dfsan_label *ret_label) {
513 char *tmp_endptr;
514 double ret = strtod(nptr, &tmp_endptr);
515 if (endptr) {
516 *endptr = tmp_endptr;
517 }
518 if (tmp_endptr > nptr) {
519 // If *tmp_endptr is '\0' include its label as well.
520 *ret_label = dfsan_read_label(
521 nptr,
522 tmp_endptr - nptr + (*tmp_endptr ? 0 : 1));
523 } else {
524 *ret_label = 0;
525 }
526 return ret;
527 }
528
529 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_strtoll(const char * nptr,char ** endptr,int base,dfsan_label nptr_label,dfsan_label endptr_label,dfsan_label base_label,dfsan_label * ret_label)530 long long int __dfsw_strtoll(const char *nptr, char **endptr, int base,
531 dfsan_label nptr_label, dfsan_label endptr_label,
532 dfsan_label base_label, dfsan_label *ret_label) {
533 char *tmp_endptr;
534 long long int ret = strtoll(nptr, &tmp_endptr, base);
535 if (endptr) {
536 *endptr = tmp_endptr;
537 }
538 if (tmp_endptr > nptr) {
539 // If *tmp_endptr is '\0' include its label as well.
540 *ret_label = dfsan_union(
541 base_label,
542 dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1)));
543 } else {
544 *ret_label = 0;
545 }
546 return ret;
547 }
548
549 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_strtoul(const char * nptr,char ** endptr,int base,dfsan_label nptr_label,dfsan_label endptr_label,dfsan_label base_label,dfsan_label * ret_label)550 unsigned long int __dfsw_strtoul(const char *nptr, char **endptr, int base,
551 dfsan_label nptr_label, dfsan_label endptr_label,
552 dfsan_label base_label, dfsan_label *ret_label) {
553 char *tmp_endptr;
554 unsigned long int ret = strtoul(nptr, &tmp_endptr, base);
555 if (endptr) {
556 *endptr = tmp_endptr;
557 }
558 if (tmp_endptr > nptr) {
559 // If *tmp_endptr is '\0' include its label as well.
560 *ret_label = dfsan_union(
561 base_label,
562 dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1)));
563 } else {
564 *ret_label = 0;
565 }
566 return ret;
567 }
568
569 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_strtoull(const char * nptr,char ** endptr,dfsan_label nptr_label,int base,dfsan_label endptr_label,dfsan_label base_label,dfsan_label * ret_label)570 long long unsigned int __dfsw_strtoull(const char *nptr, char **endptr,
571 dfsan_label nptr_label,
572 int base, dfsan_label endptr_label,
573 dfsan_label base_label,
574 dfsan_label *ret_label) {
575 char *tmp_endptr;
576 long long unsigned int ret = strtoull(nptr, &tmp_endptr, base);
577 if (endptr) {
578 *endptr = tmp_endptr;
579 }
580 if (tmp_endptr > nptr) {
581 // If *tmp_endptr is '\0' include its label as well.
582 *ret_label = dfsan_union(
583 base_label,
584 dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1)));
585 } else {
586 *ret_label = 0;
587 }
588 return ret;
589 }
590
591 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_time(time_t * t,dfsan_label t_label,dfsan_label * ret_label)592 time_t __dfsw_time(time_t *t, dfsan_label t_label, dfsan_label *ret_label) {
593 time_t ret = time(t);
594 if (ret != (time_t) -1 && t) {
595 dfsan_set_label(0, t, sizeof(time_t));
596 }
597 *ret_label = 0;
598 return ret;
599 }
600
601 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_inet_pton(int af,const char * src,void * dst,dfsan_label af_label,dfsan_label src_label,dfsan_label dst_label,dfsan_label * ret_label)602 int __dfsw_inet_pton(int af, const char *src, void *dst, dfsan_label af_label,
603 dfsan_label src_label, dfsan_label dst_label,
604 dfsan_label *ret_label) {
605 int ret = inet_pton(af, src, dst);
606 if (ret == 1) {
607 dfsan_set_label(dfsan_read_label(src, strlen(src) + 1), dst,
608 af == AF_INET ? sizeof(struct in_addr) : sizeof(in6_addr));
609 }
610 *ret_label = 0;
611 return ret;
612 }
613
614 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_localtime_r(const time_t * timep,struct tm * result,dfsan_label timep_label,dfsan_label result_label,dfsan_label * ret_label)615 struct tm *__dfsw_localtime_r(const time_t *timep, struct tm *result,
616 dfsan_label timep_label, dfsan_label result_label,
617 dfsan_label *ret_label) {
618 struct tm *ret = localtime_r(timep, result);
619 if (ret) {
620 dfsan_set_label(dfsan_read_label(timep, sizeof(time_t)), result,
621 sizeof(struct tm));
622 *ret_label = result_label;
623 } else {
624 *ret_label = 0;
625 }
626 return ret;
627 }
628
629 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_getpwuid_r(id_t uid,struct passwd * pwd,char * buf,size_t buflen,struct passwd ** result,dfsan_label uid_label,dfsan_label pwd_label,dfsan_label buf_label,dfsan_label buflen_label,dfsan_label result_label,dfsan_label * ret_label)630 int __dfsw_getpwuid_r(id_t uid, struct passwd *pwd,
631 char *buf, size_t buflen, struct passwd **result,
632 dfsan_label uid_label, dfsan_label pwd_label,
633 dfsan_label buf_label, dfsan_label buflen_label,
634 dfsan_label result_label, dfsan_label *ret_label) {
635 // Store the data in pwd, the strings referenced from pwd in buf, and the
636 // address of pwd in *result. On failure, NULL is stored in *result.
637 int ret = getpwuid_r(uid, pwd, buf, buflen, result);
638 if (ret == 0) {
639 dfsan_set_label(0, pwd, sizeof(struct passwd));
640 dfsan_set_label(0, buf, strlen(buf) + 1);
641 }
642 *ret_label = 0;
643 dfsan_set_label(0, result, sizeof(struct passwd*));
644 return ret;
645 }
646
647 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_poll(struct pollfd * fds,nfds_t nfds,int timeout,dfsan_label dfs_label,dfsan_label nfds_label,dfsan_label timeout_label,dfsan_label * ret_label)648 int __dfsw_poll(struct pollfd *fds, nfds_t nfds, int timeout,
649 dfsan_label dfs_label, dfsan_label nfds_label,
650 dfsan_label timeout_label, dfsan_label *ret_label) {
651 int ret = poll(fds, nfds, timeout);
652 if (ret >= 0) {
653 for (; nfds > 0; --nfds) {
654 dfsan_set_label(0, &fds[nfds - 1].revents, sizeof(fds[nfds - 1].revents));
655 }
656 }
657 *ret_label = 0;
658 return ret;
659 }
660
661 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_select(int nfds,fd_set * readfds,fd_set * writefds,fd_set * exceptfds,struct timeval * timeout,dfsan_label nfds_label,dfsan_label readfds_label,dfsan_label writefds_label,dfsan_label exceptfds_label,dfsan_label timeout_label,dfsan_label * ret_label)662 int __dfsw_select(int nfds, fd_set *readfds, fd_set *writefds,
663 fd_set *exceptfds, struct timeval *timeout,
664 dfsan_label nfds_label, dfsan_label readfds_label,
665 dfsan_label writefds_label, dfsan_label exceptfds_label,
666 dfsan_label timeout_label, dfsan_label *ret_label) {
667 int ret = select(nfds, readfds, writefds, exceptfds, timeout);
668 // Clear everything (also on error) since their content is either set or
669 // undefined.
670 if (readfds) {
671 dfsan_set_label(0, readfds, sizeof(fd_set));
672 }
673 if (writefds) {
674 dfsan_set_label(0, writefds, sizeof(fd_set));
675 }
676 if (exceptfds) {
677 dfsan_set_label(0, exceptfds, sizeof(fd_set));
678 }
679 dfsan_set_label(0, timeout, sizeof(struct timeval));
680 *ret_label = 0;
681 return ret;
682 }
683
684 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_sched_getaffinity(pid_t pid,size_t cpusetsize,cpu_set_t * mask,dfsan_label pid_label,dfsan_label cpusetsize_label,dfsan_label mask_label,dfsan_label * ret_label)685 int __dfsw_sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *mask,
686 dfsan_label pid_label,
687 dfsan_label cpusetsize_label,
688 dfsan_label mask_label, dfsan_label *ret_label) {
689 int ret = sched_getaffinity(pid, cpusetsize, mask);
690 if (ret == 0) {
691 dfsan_set_label(0, mask, cpusetsize);
692 }
693 *ret_label = 0;
694 return ret;
695 }
696
697 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_sigemptyset(sigset_t * set,dfsan_label set_label,dfsan_label * ret_label)698 int __dfsw_sigemptyset(sigset_t *set, dfsan_label set_label,
699 dfsan_label *ret_label) {
700 int ret = sigemptyset(set);
701 dfsan_set_label(0, set, sizeof(sigset_t));
702 return ret;
703 }
704
705 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_sigaction(int signum,const struct sigaction * act,struct sigaction * oldact,dfsan_label signum_label,dfsan_label act_label,dfsan_label oldact_label,dfsan_label * ret_label)706 int __dfsw_sigaction(int signum, const struct sigaction *act,
707 struct sigaction *oldact, dfsan_label signum_label,
708 dfsan_label act_label, dfsan_label oldact_label,
709 dfsan_label *ret_label) {
710 int ret = sigaction(signum, act, oldact);
711 if (oldact) {
712 dfsan_set_label(0, oldact, sizeof(struct sigaction));
713 }
714 *ret_label = 0;
715 return ret;
716 }
717
718 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_gettimeofday(struct timeval * tv,struct timezone * tz,dfsan_label tv_label,dfsan_label tz_label,dfsan_label * ret_label)719 int __dfsw_gettimeofday(struct timeval *tv, struct timezone *tz,
720 dfsan_label tv_label, dfsan_label tz_label,
721 dfsan_label *ret_label) {
722 int ret = gettimeofday(tv, tz);
723 if (tv) {
724 dfsan_set_label(0, tv, sizeof(struct timeval));
725 }
726 if (tz) {
727 dfsan_set_label(0, tz, sizeof(struct timezone));
728 }
729 *ret_label = 0;
730 return ret;
731 }
732
__dfsw_memchr(void * s,int c,size_t n,dfsan_label s_label,dfsan_label c_label,dfsan_label n_label,dfsan_label * ret_label)733 SANITIZER_INTERFACE_ATTRIBUTE void *__dfsw_memchr(void *s, int c, size_t n,
734 dfsan_label s_label,
735 dfsan_label c_label,
736 dfsan_label n_label,
737 dfsan_label *ret_label) {
738 void *ret = memchr(s, c, n);
739 if (flags().strict_data_dependencies) {
740 *ret_label = ret ? s_label : 0;
741 } else {
742 size_t len =
743 ret ? reinterpret_cast<char *>(ret) - reinterpret_cast<char *>(s) + 1
744 : n;
745 *ret_label =
746 dfsan_union(dfsan_read_label(s, len), dfsan_union(s_label, c_label));
747 }
748 return ret;
749 }
750
__dfsw_strrchr(char * s,int c,dfsan_label s_label,dfsan_label c_label,dfsan_label * ret_label)751 SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strrchr(char *s, int c,
752 dfsan_label s_label,
753 dfsan_label c_label,
754 dfsan_label *ret_label) {
755 char *ret = strrchr(s, c);
756 if (flags().strict_data_dependencies) {
757 *ret_label = ret ? s_label : 0;
758 } else {
759 *ret_label =
760 dfsan_union(dfsan_read_label(s, strlen(s) + 1),
761 dfsan_union(s_label, c_label));
762 }
763
764 return ret;
765 }
766
__dfsw_strstr(char * haystack,char * needle,dfsan_label haystack_label,dfsan_label needle_label,dfsan_label * ret_label)767 SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strstr(char *haystack, char *needle,
768 dfsan_label haystack_label,
769 dfsan_label needle_label,
770 dfsan_label *ret_label) {
771 char *ret = strstr(haystack, needle);
772 if (flags().strict_data_dependencies) {
773 *ret_label = ret ? haystack_label : 0;
774 } else {
775 size_t len = ret ? ret + strlen(needle) - haystack : strlen(haystack) + 1;
776 *ret_label =
777 dfsan_union(dfsan_read_label(haystack, len),
778 dfsan_union(dfsan_read_label(needle, strlen(needle) + 1),
779 dfsan_union(haystack_label, needle_label)));
780 }
781
782 return ret;
783 }
784
__dfsw_nanosleep(const struct timespec * req,struct timespec * rem,dfsan_label req_label,dfsan_label rem_label,dfsan_label * ret_label)785 SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_nanosleep(const struct timespec *req,
786 struct timespec *rem,
787 dfsan_label req_label,
788 dfsan_label rem_label,
789 dfsan_label *ret_label) {
790 int ret = nanosleep(req, rem);
791 *ret_label = 0;
792 if (ret == -1) {
793 // Interrupted by a signal, rem is filled with the remaining time.
794 dfsan_set_label(0, rem, sizeof(struct timespec));
795 }
796 return ret;
797 }
798
799 SANITIZER_INTERFACE_ATTRIBUTE int
__dfsw_socketpair(int domain,int type,int protocol,int sv[2],dfsan_label domain_label,dfsan_label type_label,dfsan_label protocol_label,dfsan_label sv_label,dfsan_label * ret_label)800 __dfsw_socketpair(int domain, int type, int protocol, int sv[2],
801 dfsan_label domain_label, dfsan_label type_label,
802 dfsan_label protocol_label, dfsan_label sv_label,
803 dfsan_label *ret_label) {
804 int ret = socketpair(domain, type, protocol, sv);
805 *ret_label = 0;
806 if (ret == 0) {
807 dfsan_set_label(0, sv, sizeof(*sv) * 2);
808 }
809 return ret;
810 }
811
812 // Type of the trampoline function passed to the custom version of
813 // dfsan_set_write_callback.
814 typedef void (*write_trampoline_t)(
815 void *callback,
816 int fd, const void *buf, ssize_t count,
817 dfsan_label fd_label, dfsan_label buf_label, dfsan_label count_label);
818
819 // Calls to dfsan_set_write_callback() set the values in this struct.
820 // Calls to the custom version of write() read (and invoke) them.
821 static struct {
822 write_trampoline_t write_callback_trampoline = NULL;
823 void *write_callback = NULL;
824 } write_callback_info;
825
826 SANITIZER_INTERFACE_ATTRIBUTE void
__dfsw_dfsan_set_write_callback(write_trampoline_t write_callback_trampoline,void * write_callback,dfsan_label write_callback_label,dfsan_label * ret_label)827 __dfsw_dfsan_set_write_callback(
828 write_trampoline_t write_callback_trampoline,
829 void *write_callback,
830 dfsan_label write_callback_label,
831 dfsan_label *ret_label) {
832 write_callback_info.write_callback_trampoline = write_callback_trampoline;
833 write_callback_info.write_callback = write_callback;
834 }
835
836 SANITIZER_INTERFACE_ATTRIBUTE int
__dfsw_write(int fd,const void * buf,size_t count,dfsan_label fd_label,dfsan_label buf_label,dfsan_label count_label,dfsan_label * ret_label)837 __dfsw_write(int fd, const void *buf, size_t count,
838 dfsan_label fd_label, dfsan_label buf_label,
839 dfsan_label count_label, dfsan_label *ret_label) {
840 if (write_callback_info.write_callback != NULL) {
841 write_callback_info.write_callback_trampoline(
842 write_callback_info.write_callback,
843 fd, buf, count,
844 fd_label, buf_label, count_label);
845 }
846
847 *ret_label = 0;
848 return write(fd, buf, count);
849 }
850 }
851
852 // Type used to extract a dfsan_label with va_arg()
853 typedef int dfsan_label_va;
854
855 // Formats a chunk either a constant string or a single format directive (e.g.,
856 // '%.3f').
857 struct Formatter {
FormatterFormatter858 Formatter(char *str_, const char *fmt_, size_t size_)
859 : str(str_), str_off(0), size(size_), fmt_start(fmt_), fmt_cur(fmt_),
860 width(-1) {}
861
formatFormatter862 int format() {
863 char *tmp_fmt = build_format_string();
864 int retval =
865 snprintf(str + str_off, str_off < size ? size - str_off : 0, tmp_fmt,
866 0 /* used only to avoid warnings */);
867 free(tmp_fmt);
868 return retval;
869 }
870
formatFormatter871 template <typename T> int format(T arg) {
872 char *tmp_fmt = build_format_string();
873 int retval;
874 if (width >= 0) {
875 retval = snprintf(str + str_off, str_off < size ? size - str_off : 0,
876 tmp_fmt, width, arg);
877 } else {
878 retval = snprintf(str + str_off, str_off < size ? size - str_off : 0,
879 tmp_fmt, arg);
880 }
881 free(tmp_fmt);
882 return retval;
883 }
884
build_format_stringFormatter885 char *build_format_string() {
886 size_t fmt_size = fmt_cur - fmt_start + 1;
887 char *new_fmt = (char *)malloc(fmt_size + 1);
888 assert(new_fmt);
889 internal_memcpy(new_fmt, fmt_start, fmt_size);
890 new_fmt[fmt_size] = '\0';
891 return new_fmt;
892 }
893
str_curFormatter894 char *str_cur() { return str + str_off; }
895
num_written_bytesFormatter896 size_t num_written_bytes(int retval) {
897 if (retval < 0) {
898 return 0;
899 }
900
901 size_t num_avail = str_off < size ? size - str_off : 0;
902 if (num_avail == 0) {
903 return 0;
904 }
905
906 size_t num_written = retval;
907 // A return value of {v,}snprintf of size or more means that the output was
908 // truncated.
909 if (num_written >= num_avail) {
910 num_written -= num_avail;
911 }
912
913 return num_written;
914 }
915
916 char *str;
917 size_t str_off;
918 size_t size;
919 const char *fmt_start;
920 const char *fmt_cur;
921 int width;
922 };
923
924 // Formats the input and propagates the input labels to the output. The output
925 // is stored in 'str'. 'size' bounds the number of output bytes. 'format' and
926 // 'ap' are the format string and the list of arguments for formatting. Returns
927 // the return value vsnprintf would return.
928 //
929 // The function tokenizes the format string in chunks representing either a
930 // constant string or a single format directive (e.g., '%.3f') and formats each
931 // chunk independently into the output string. This approach allows to figure
932 // out which bytes of the output string depends on which argument and thus to
933 // propagate labels more precisely.
934 //
935 // WARNING: This implementation does not support conversion specifiers with
936 // positional arguments.
format_buffer(char * str,size_t size,const char * fmt,dfsan_label * va_labels,dfsan_label * ret_label,va_list ap)937 static int format_buffer(char *str, size_t size, const char *fmt,
938 dfsan_label *va_labels, dfsan_label *ret_label,
939 va_list ap) {
940 Formatter formatter(str, fmt, size);
941
942 while (*formatter.fmt_cur) {
943 formatter.fmt_start = formatter.fmt_cur;
944 formatter.width = -1;
945 int retval = 0;
946
947 if (*formatter.fmt_cur != '%') {
948 // Ordinary character. Consume all the characters until a '%' or the end
949 // of the string.
950 for (; *(formatter.fmt_cur + 1) && *(formatter.fmt_cur + 1) != '%';
951 ++formatter.fmt_cur) {}
952 retval = formatter.format();
953 dfsan_set_label(0, formatter.str_cur(),
954 formatter.num_written_bytes(retval));
955 } else {
956 // Conversion directive. Consume all the characters until a conversion
957 // specifier or the end of the string.
958 bool end_fmt = false;
959 for (; *formatter.fmt_cur && !end_fmt; ) {
960 switch (*++formatter.fmt_cur) {
961 case 'd':
962 case 'i':
963 case 'o':
964 case 'u':
965 case 'x':
966 case 'X':
967 switch (*(formatter.fmt_cur - 1)) {
968 case 'h':
969 // Also covers the 'hh' case (since the size of the arg is still
970 // an int).
971 retval = formatter.format(va_arg(ap, int));
972 break;
973 case 'l':
974 if (formatter.fmt_cur - formatter.fmt_start >= 2 &&
975 *(formatter.fmt_cur - 2) == 'l') {
976 retval = formatter.format(va_arg(ap, long long int));
977 } else {
978 retval = formatter.format(va_arg(ap, long int));
979 }
980 break;
981 case 'q':
982 retval = formatter.format(va_arg(ap, long long int));
983 break;
984 case 'j':
985 retval = formatter.format(va_arg(ap, intmax_t));
986 break;
987 case 'z':
988 case 't':
989 retval = formatter.format(va_arg(ap, size_t));
990 break;
991 default:
992 retval = formatter.format(va_arg(ap, int));
993 }
994 dfsan_set_label(*va_labels++, formatter.str_cur(),
995 formatter.num_written_bytes(retval));
996 end_fmt = true;
997 break;
998
999 case 'a':
1000 case 'A':
1001 case 'e':
1002 case 'E':
1003 case 'f':
1004 case 'F':
1005 case 'g':
1006 case 'G':
1007 if (*(formatter.fmt_cur - 1) == 'L') {
1008 retval = formatter.format(va_arg(ap, long double));
1009 } else {
1010 retval = formatter.format(va_arg(ap, double));
1011 }
1012 dfsan_set_label(*va_labels++, formatter.str_cur(),
1013 formatter.num_written_bytes(retval));
1014 end_fmt = true;
1015 break;
1016
1017 case 'c':
1018 retval = formatter.format(va_arg(ap, int));
1019 dfsan_set_label(*va_labels++, formatter.str_cur(),
1020 formatter.num_written_bytes(retval));
1021 end_fmt = true;
1022 break;
1023
1024 case 's': {
1025 char *arg = va_arg(ap, char *);
1026 retval = formatter.format(arg);
1027 va_labels++;
1028 internal_memcpy(shadow_for(formatter.str_cur()), shadow_for(arg),
1029 sizeof(dfsan_label) *
1030 formatter.num_written_bytes(retval));
1031 end_fmt = true;
1032 break;
1033 }
1034
1035 case 'p':
1036 retval = formatter.format(va_arg(ap, void *));
1037 dfsan_set_label(*va_labels++, formatter.str_cur(),
1038 formatter.num_written_bytes(retval));
1039 end_fmt = true;
1040 break;
1041
1042 case 'n': {
1043 int *ptr = va_arg(ap, int *);
1044 *ptr = (int)formatter.str_off;
1045 va_labels++;
1046 dfsan_set_label(0, ptr, sizeof(ptr));
1047 end_fmt = true;
1048 break;
1049 }
1050
1051 case '%':
1052 retval = formatter.format();
1053 dfsan_set_label(0, formatter.str_cur(),
1054 formatter.num_written_bytes(retval));
1055 end_fmt = true;
1056 break;
1057
1058 case '*':
1059 formatter.width = va_arg(ap, int);
1060 va_labels++;
1061 break;
1062
1063 default:
1064 break;
1065 }
1066 }
1067 }
1068
1069 if (retval < 0) {
1070 return retval;
1071 }
1072
1073 formatter.fmt_cur++;
1074 formatter.str_off += retval;
1075 }
1076
1077 *ret_label = 0;
1078
1079 // Number of bytes written in total.
1080 return formatter.str_off;
1081 }
1082
1083 extern "C" {
1084 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_sprintf(char * str,const char * format,dfsan_label str_label,dfsan_label format_label,dfsan_label * va_labels,dfsan_label * ret_label,...)1085 int __dfsw_sprintf(char *str, const char *format, dfsan_label str_label,
1086 dfsan_label format_label, dfsan_label *va_labels,
1087 dfsan_label *ret_label, ...) {
1088 va_list ap;
1089 va_start(ap, ret_label);
1090 int ret = format_buffer(str, ~0ul, format, va_labels, ret_label, ap);
1091 va_end(ap);
1092 return ret;
1093 }
1094
1095 SANITIZER_INTERFACE_ATTRIBUTE
__dfsw_snprintf(char * str,size_t size,const char * format,dfsan_label str_label,dfsan_label size_label,dfsan_label format_label,dfsan_label * va_labels,dfsan_label * ret_label,...)1096 int __dfsw_snprintf(char *str, size_t size, const char *format,
1097 dfsan_label str_label, dfsan_label size_label,
1098 dfsan_label format_label, dfsan_label *va_labels,
1099 dfsan_label *ret_label, ...) {
1100 va_list ap;
1101 va_start(ap, ret_label);
1102 int ret = format_buffer(str, size, format, va_labels, ret_label, ap);
1103 va_end(ap);
1104 return ret;
1105 }
1106 }
1107