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1a4d82fc JJ |
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 | ||
92a42be0 | 15 | #include "sanitizer_common/sanitizer_common.h" |
1a4d82fc JJ |
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> | |
92a42be0 | 22 | #include <assert.h> |
1a4d82fc JJ |
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> | |
92a42be0 SL |
31 | #include <stdarg.h> |
32 | #include <stdint.h> | |
1a4d82fc JJ |
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 | ||
92a42be0 SL |
46 | #define CALL_WEAK_INTERCEPTOR_HOOK(f, ...) \ |
47 | do { \ | |
48 | if (f) \ | |
49 | f(__VA_ARGS__); \ | |
50 | } while (false) | |
51 | #define DECLARE_WEAK_INTERCEPTOR_HOOK(f, ...) \ | |
52 | SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void f(__VA_ARGS__); | |
53 | ||
1a4d82fc JJ |
54 | extern "C" { |
55 | SANITIZER_INTERFACE_ATTRIBUTE int | |
56 | __dfsw_stat(const char *path, struct stat *buf, dfsan_label path_label, | |
57 | dfsan_label buf_label, dfsan_label *ret_label) { | |
58 | int ret = stat(path, buf); | |
59 | if (ret == 0) | |
60 | dfsan_set_label(0, buf, sizeof(struct stat)); | |
61 | *ret_label = 0; | |
62 | return ret; | |
63 | } | |
64 | ||
65 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_fstat(int fd, struct stat *buf, | |
66 | dfsan_label fd_label, | |
67 | dfsan_label buf_label, | |
68 | dfsan_label *ret_label) { | |
69 | int ret = fstat(fd, buf); | |
70 | if (ret == 0) | |
71 | dfsan_set_label(0, buf, sizeof(struct stat)); | |
72 | *ret_label = 0; | |
73 | return ret; | |
74 | } | |
75 | ||
76 | SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strchr(const char *s, int c, | |
77 | dfsan_label s_label, | |
78 | dfsan_label c_label, | |
79 | dfsan_label *ret_label) { | |
80 | for (size_t i = 0;; ++i) { | |
81 | if (s[i] == c || s[i] == 0) { | |
82 | if (flags().strict_data_dependencies) { | |
83 | *ret_label = s_label; | |
84 | } else { | |
85 | *ret_label = dfsan_union(dfsan_read_label(s, i + 1), | |
86 | dfsan_union(s_label, c_label)); | |
87 | } | |
92a42be0 | 88 | return s[i] == 0 ? nullptr : const_cast<char *>(s+i); |
1a4d82fc JJ |
89 | } |
90 | } | |
91 | } | |
92 | ||
92a42be0 SL |
93 | DECLARE_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_memcmp, uptr caller_pc, |
94 | const void *s1, const void *s2, size_t n, | |
95 | dfsan_label s1_label, dfsan_label s2_label, | |
96 | dfsan_label n_label) | |
97 | ||
1a4d82fc JJ |
98 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_memcmp(const void *s1, const void *s2, |
99 | size_t n, dfsan_label s1_label, | |
100 | dfsan_label s2_label, | |
101 | dfsan_label n_label, | |
102 | dfsan_label *ret_label) { | |
92a42be0 SL |
103 | CALL_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_memcmp, GET_CALLER_PC(), s1, s2, n, |
104 | s1_label, s2_label, n_label); | |
1a4d82fc JJ |
105 | const char *cs1 = (const char *) s1, *cs2 = (const char *) s2; |
106 | for (size_t i = 0; i != n; ++i) { | |
107 | if (cs1[i] != cs2[i]) { | |
108 | if (flags().strict_data_dependencies) { | |
109 | *ret_label = 0; | |
110 | } else { | |
111 | *ret_label = dfsan_union(dfsan_read_label(cs1, i + 1), | |
112 | dfsan_read_label(cs2, i + 1)); | |
113 | } | |
114 | return cs1[i] - cs2[i]; | |
115 | } | |
116 | } | |
117 | ||
118 | if (flags().strict_data_dependencies) { | |
119 | *ret_label = 0; | |
120 | } else { | |
121 | *ret_label = dfsan_union(dfsan_read_label(cs1, n), | |
122 | dfsan_read_label(cs2, n)); | |
123 | } | |
124 | return 0; | |
125 | } | |
126 | ||
92a42be0 SL |
127 | DECLARE_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strcmp, uptr caller_pc, |
128 | const char *s1, const char *s2, | |
129 | dfsan_label s1_label, dfsan_label s2_label) | |
130 | ||
1a4d82fc JJ |
131 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strcmp(const char *s1, const char *s2, |
132 | dfsan_label s1_label, | |
133 | dfsan_label s2_label, | |
134 | dfsan_label *ret_label) { | |
92a42be0 SL |
135 | CALL_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strcmp, GET_CALLER_PC(), s1, s2, |
136 | s1_label, s2_label); | |
1a4d82fc JJ |
137 | for (size_t i = 0;; ++i) { |
138 | if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0) { | |
139 | if (flags().strict_data_dependencies) { | |
140 | *ret_label = 0; | |
141 | } else { | |
142 | *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), | |
143 | dfsan_read_label(s2, i + 1)); | |
144 | } | |
145 | return s1[i] - s2[i]; | |
146 | } | |
147 | } | |
148 | return 0; | |
149 | } | |
150 | ||
151 | SANITIZER_INTERFACE_ATTRIBUTE int | |
152 | __dfsw_strcasecmp(const char *s1, const char *s2, dfsan_label s1_label, | |
153 | dfsan_label s2_label, dfsan_label *ret_label) { | |
154 | for (size_t i = 0;; ++i) { | |
155 | if (tolower(s1[i]) != tolower(s2[i]) || s1[i] == 0 || s2[i] == 0) { | |
156 | if (flags().strict_data_dependencies) { | |
157 | *ret_label = 0; | |
158 | } else { | |
159 | *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), | |
160 | dfsan_read_label(s2, i + 1)); | |
161 | } | |
162 | return s1[i] - s2[i]; | |
163 | } | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
92a42be0 SL |
168 | DECLARE_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strncmp, uptr caller_pc, |
169 | const char *s1, const char *s2, size_t n, | |
170 | dfsan_label s1_label, dfsan_label s2_label, | |
171 | dfsan_label n_label) | |
172 | ||
1a4d82fc JJ |
173 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strncmp(const char *s1, const char *s2, |
174 | size_t n, dfsan_label s1_label, | |
175 | dfsan_label s2_label, | |
176 | dfsan_label n_label, | |
177 | dfsan_label *ret_label) { | |
178 | if (n == 0) { | |
179 | *ret_label = 0; | |
180 | return 0; | |
181 | } | |
182 | ||
92a42be0 SL |
183 | CALL_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strncmp, GET_CALLER_PC(), s1, s2, |
184 | n, s1_label, s2_label, n_label); | |
185 | ||
1a4d82fc JJ |
186 | for (size_t i = 0;; ++i) { |
187 | if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0 || i == n - 1) { | |
188 | if (flags().strict_data_dependencies) { | |
189 | *ret_label = 0; | |
190 | } else { | |
191 | *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), | |
192 | dfsan_read_label(s2, i + 1)); | |
193 | } | |
194 | return s1[i] - s2[i]; | |
195 | } | |
196 | } | |
197 | return 0; | |
198 | } | |
199 | ||
200 | SANITIZER_INTERFACE_ATTRIBUTE int | |
201 | __dfsw_strncasecmp(const char *s1, const char *s2, size_t n, | |
202 | dfsan_label s1_label, dfsan_label s2_label, | |
203 | dfsan_label n_label, dfsan_label *ret_label) { | |
204 | if (n == 0) { | |
205 | *ret_label = 0; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | for (size_t i = 0;; ++i) { | |
210 | if (tolower(s1[i]) != tolower(s2[i]) || s1[i] == 0 || s2[i] == 0 || | |
211 | i == n - 1) { | |
212 | if (flags().strict_data_dependencies) { | |
213 | *ret_label = 0; | |
214 | } else { | |
215 | *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), | |
216 | dfsan_read_label(s2, i + 1)); | |
217 | } | |
218 | return s1[i] - s2[i]; | |
219 | } | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | SANITIZER_INTERFACE_ATTRIBUTE void *__dfsw_calloc(size_t nmemb, size_t size, | |
225 | dfsan_label nmemb_label, | |
226 | dfsan_label size_label, | |
227 | dfsan_label *ret_label) { | |
228 | void *p = calloc(nmemb, size); | |
229 | dfsan_set_label(0, p, nmemb * size); | |
230 | *ret_label = 0; | |
231 | return p; | |
232 | } | |
233 | ||
234 | SANITIZER_INTERFACE_ATTRIBUTE size_t | |
235 | __dfsw_strlen(const char *s, dfsan_label s_label, dfsan_label *ret_label) { | |
236 | size_t ret = strlen(s); | |
237 | if (flags().strict_data_dependencies) { | |
238 | *ret_label = 0; | |
239 | } else { | |
240 | *ret_label = dfsan_read_label(s, ret + 1); | |
241 | } | |
242 | return ret; | |
243 | } | |
244 | ||
245 | ||
246 | static void *dfsan_memcpy(void *dest, const void *src, size_t n) { | |
92a42be0 SL |
247 | dfsan_label *sdest = shadow_for(dest); |
248 | const dfsan_label *ssrc = shadow_for(src); | |
249 | internal_memcpy((void *)sdest, (const void *)ssrc, n * sizeof(dfsan_label)); | |
1a4d82fc JJ |
250 | return internal_memcpy(dest, src, n); |
251 | } | |
252 | ||
253 | static void dfsan_memset(void *s, int c, dfsan_label c_label, size_t n) { | |
254 | internal_memset(s, c, n); | |
255 | dfsan_set_label(c_label, s, n); | |
256 | } | |
257 | ||
258 | SANITIZER_INTERFACE_ATTRIBUTE | |
259 | void *__dfsw_memcpy(void *dest, const void *src, size_t n, | |
260 | dfsan_label dest_label, dfsan_label src_label, | |
261 | dfsan_label n_label, dfsan_label *ret_label) { | |
262 | *ret_label = dest_label; | |
263 | return dfsan_memcpy(dest, src, n); | |
264 | } | |
265 | ||
266 | SANITIZER_INTERFACE_ATTRIBUTE | |
267 | void *__dfsw_memset(void *s, int c, size_t n, | |
268 | dfsan_label s_label, dfsan_label c_label, | |
269 | dfsan_label n_label, dfsan_label *ret_label) { | |
270 | dfsan_memset(s, c, c_label, n); | |
271 | *ret_label = s_label; | |
272 | return s; | |
273 | } | |
274 | ||
275 | SANITIZER_INTERFACE_ATTRIBUTE char * | |
276 | __dfsw_strdup(const char *s, dfsan_label s_label, dfsan_label *ret_label) { | |
277 | size_t len = strlen(s); | |
278 | void *p = malloc(len+1); | |
279 | dfsan_memcpy(p, s, len+1); | |
280 | *ret_label = 0; | |
281 | return static_cast<char *>(p); | |
282 | } | |
283 | ||
284 | SANITIZER_INTERFACE_ATTRIBUTE char * | |
285 | __dfsw_strncpy(char *s1, const char *s2, size_t n, dfsan_label s1_label, | |
286 | dfsan_label s2_label, dfsan_label n_label, | |
287 | dfsan_label *ret_label) { | |
288 | size_t len = strlen(s2); | |
289 | if (len < n) { | |
290 | dfsan_memcpy(s1, s2, len+1); | |
291 | dfsan_memset(s1+len+1, 0, 0, n-len-1); | |
292 | } else { | |
293 | dfsan_memcpy(s1, s2, n); | |
294 | } | |
295 | ||
296 | *ret_label = s1_label; | |
297 | return s1; | |
298 | } | |
299 | ||
300 | SANITIZER_INTERFACE_ATTRIBUTE ssize_t | |
301 | __dfsw_pread(int fd, void *buf, size_t count, off_t offset, | |
302 | dfsan_label fd_label, dfsan_label buf_label, | |
303 | dfsan_label count_label, dfsan_label offset_label, | |
304 | dfsan_label *ret_label) { | |
305 | ssize_t ret = pread(fd, buf, count, offset); | |
306 | if (ret > 0) | |
307 | dfsan_set_label(0, buf, ret); | |
308 | *ret_label = 0; | |
309 | return ret; | |
310 | } | |
311 | ||
312 | SANITIZER_INTERFACE_ATTRIBUTE ssize_t | |
313 | __dfsw_read(int fd, void *buf, size_t count, | |
314 | dfsan_label fd_label, dfsan_label buf_label, | |
315 | dfsan_label count_label, | |
316 | dfsan_label *ret_label) { | |
317 | ssize_t ret = read(fd, buf, count); | |
318 | if (ret > 0) | |
319 | dfsan_set_label(0, buf, ret); | |
320 | *ret_label = 0; | |
321 | return ret; | |
322 | } | |
323 | ||
324 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_clock_gettime(clockid_t clk_id, | |
325 | struct timespec *tp, | |
326 | dfsan_label clk_id_label, | |
327 | dfsan_label tp_label, | |
328 | dfsan_label *ret_label) { | |
329 | int ret = clock_gettime(clk_id, tp); | |
330 | if (ret == 0) | |
331 | dfsan_set_label(0, tp, sizeof(struct timespec)); | |
332 | *ret_label = 0; | |
333 | return ret; | |
334 | } | |
335 | ||
336 | static void unpoison(const void *ptr, uptr size) { | |
337 | dfsan_set_label(0, const_cast<void *>(ptr), size); | |
338 | } | |
339 | ||
340 | // dlopen() ultimately calls mmap() down inside the loader, which generally | |
341 | // doesn't participate in dynamic symbol resolution. Therefore we won't | |
342 | // intercept its calls to mmap, and we have to hook it here. | |
343 | SANITIZER_INTERFACE_ATTRIBUTE void * | |
344 | __dfsw_dlopen(const char *filename, int flag, dfsan_label filename_label, | |
345 | dfsan_label flag_label, dfsan_label *ret_label) { | |
92a42be0 SL |
346 | void *handle = dlopen(filename, flag); |
347 | link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE(handle); | |
1a4d82fc JJ |
348 | if (map) |
349 | ForEachMappedRegion(map, unpoison); | |
350 | *ret_label = 0; | |
92a42be0 | 351 | return handle; |
1a4d82fc JJ |
352 | } |
353 | ||
354 | struct pthread_create_info { | |
355 | void *(*start_routine_trampoline)(void *, void *, dfsan_label, dfsan_label *); | |
356 | void *start_routine; | |
357 | void *arg; | |
358 | }; | |
359 | ||
360 | static void *pthread_create_cb(void *p) { | |
361 | pthread_create_info pci(*(pthread_create_info *)p); | |
362 | free(p); | |
363 | dfsan_label ret_label; | |
364 | return pci.start_routine_trampoline(pci.start_routine, pci.arg, 0, | |
365 | &ret_label); | |
366 | } | |
367 | ||
368 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_pthread_create( | |
369 | pthread_t *thread, const pthread_attr_t *attr, | |
370 | void *(*start_routine_trampoline)(void *, void *, dfsan_label, | |
371 | dfsan_label *), | |
372 | void *start_routine, void *arg, dfsan_label thread_label, | |
373 | dfsan_label attr_label, dfsan_label start_routine_label, | |
374 | dfsan_label arg_label, dfsan_label *ret_label) { | |
375 | pthread_create_info *pci = | |
376 | (pthread_create_info *)malloc(sizeof(pthread_create_info)); | |
377 | pci->start_routine_trampoline = start_routine_trampoline; | |
378 | pci->start_routine = start_routine; | |
379 | pci->arg = arg; | |
380 | int rv = pthread_create(thread, attr, pthread_create_cb, (void *)pci); | |
381 | if (rv != 0) | |
382 | free(pci); | |
383 | *ret_label = 0; | |
384 | return rv; | |
385 | } | |
386 | ||
387 | struct dl_iterate_phdr_info { | |
388 | int (*callback_trampoline)(void *callback, struct dl_phdr_info *info, | |
389 | size_t size, void *data, dfsan_label info_label, | |
390 | dfsan_label size_label, dfsan_label data_label, | |
391 | dfsan_label *ret_label); | |
392 | void *callback; | |
393 | void *data; | |
394 | }; | |
395 | ||
396 | int dl_iterate_phdr_cb(struct dl_phdr_info *info, size_t size, void *data) { | |
397 | dl_iterate_phdr_info *dipi = (dl_iterate_phdr_info *)data; | |
398 | dfsan_set_label(0, *info); | |
92a42be0 SL |
399 | dfsan_set_label(0, const_cast<char *>(info->dlpi_name), |
400 | strlen(info->dlpi_name) + 1); | |
401 | dfsan_set_label( | |
402 | 0, const_cast<char *>(reinterpret_cast<const char *>(info->dlpi_phdr)), | |
403 | sizeof(*info->dlpi_phdr) * info->dlpi_phnum); | |
1a4d82fc JJ |
404 | dfsan_label ret_label; |
405 | return dipi->callback_trampoline(dipi->callback, info, size, dipi->data, 0, 0, | |
406 | 0, &ret_label); | |
407 | } | |
408 | ||
409 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_dl_iterate_phdr( | |
410 | int (*callback_trampoline)(void *callback, struct dl_phdr_info *info, | |
411 | size_t size, void *data, dfsan_label info_label, | |
412 | dfsan_label size_label, dfsan_label data_label, | |
413 | dfsan_label *ret_label), | |
414 | void *callback, void *data, dfsan_label callback_label, | |
415 | dfsan_label data_label, dfsan_label *ret_label) { | |
416 | dl_iterate_phdr_info dipi = { callback_trampoline, callback, data }; | |
417 | *ret_label = 0; | |
418 | return dl_iterate_phdr(dl_iterate_phdr_cb, &dipi); | |
419 | } | |
420 | ||
421 | SANITIZER_INTERFACE_ATTRIBUTE | |
422 | char *__dfsw_ctime_r(const time_t *timep, char *buf, dfsan_label timep_label, | |
423 | dfsan_label buf_label, dfsan_label *ret_label) { | |
424 | char *ret = ctime_r(timep, buf); | |
425 | if (ret) { | |
426 | dfsan_set_label(dfsan_read_label(timep, sizeof(time_t)), buf, | |
427 | strlen(buf) + 1); | |
428 | *ret_label = buf_label; | |
429 | } else { | |
430 | *ret_label = 0; | |
431 | } | |
432 | return ret; | |
433 | } | |
434 | ||
435 | SANITIZER_INTERFACE_ATTRIBUTE | |
436 | char *__dfsw_fgets(char *s, int size, FILE *stream, dfsan_label s_label, | |
437 | dfsan_label size_label, dfsan_label stream_label, | |
438 | dfsan_label *ret_label) { | |
439 | char *ret = fgets(s, size, stream); | |
440 | if (ret) { | |
441 | dfsan_set_label(0, ret, strlen(ret) + 1); | |
442 | *ret_label = s_label; | |
443 | } else { | |
444 | *ret_label = 0; | |
445 | } | |
446 | return ret; | |
447 | } | |
448 | ||
449 | SANITIZER_INTERFACE_ATTRIBUTE | |
450 | char *__dfsw_getcwd(char *buf, size_t size, dfsan_label buf_label, | |
451 | dfsan_label size_label, dfsan_label *ret_label) { | |
452 | char *ret = getcwd(buf, size); | |
453 | if (ret) { | |
454 | dfsan_set_label(0, ret, strlen(ret) + 1); | |
455 | *ret_label = buf_label; | |
456 | } else { | |
457 | *ret_label = 0; | |
458 | } | |
459 | return ret; | |
460 | } | |
461 | ||
462 | SANITIZER_INTERFACE_ATTRIBUTE | |
463 | char *__dfsw_get_current_dir_name(dfsan_label *ret_label) { | |
464 | char *ret = get_current_dir_name(); | |
465 | if (ret) { | |
466 | dfsan_set_label(0, ret, strlen(ret) + 1); | |
467 | } | |
468 | *ret_label = 0; | |
469 | return ret; | |
470 | } | |
471 | ||
472 | SANITIZER_INTERFACE_ATTRIBUTE | |
473 | int __dfsw_gethostname(char *name, size_t len, dfsan_label name_label, | |
474 | dfsan_label len_label, dfsan_label *ret_label) { | |
475 | int ret = gethostname(name, len); | |
476 | if (ret == 0) { | |
477 | dfsan_set_label(0, name, strlen(name) + 1); | |
478 | } | |
479 | *ret_label = 0; | |
480 | return ret; | |
481 | } | |
482 | ||
483 | SANITIZER_INTERFACE_ATTRIBUTE | |
484 | int __dfsw_getrlimit(int resource, struct rlimit *rlim, | |
485 | dfsan_label resource_label, dfsan_label rlim_label, | |
486 | dfsan_label *ret_label) { | |
487 | int ret = getrlimit(resource, rlim); | |
488 | if (ret == 0) { | |
489 | dfsan_set_label(0, rlim, sizeof(struct rlimit)); | |
490 | } | |
491 | *ret_label = 0; | |
492 | return ret; | |
493 | } | |
494 | ||
495 | SANITIZER_INTERFACE_ATTRIBUTE | |
496 | int __dfsw_getrusage(int who, struct rusage *usage, dfsan_label who_label, | |
497 | dfsan_label usage_label, dfsan_label *ret_label) { | |
498 | int ret = getrusage(who, usage); | |
499 | if (ret == 0) { | |
500 | dfsan_set_label(0, usage, sizeof(struct rusage)); | |
501 | } | |
502 | *ret_label = 0; | |
503 | return ret; | |
504 | } | |
505 | ||
506 | SANITIZER_INTERFACE_ATTRIBUTE | |
507 | char *__dfsw_strcpy(char *dest, const char *src, dfsan_label dst_label, | |
508 | dfsan_label src_label, dfsan_label *ret_label) { | |
509 | char *ret = strcpy(dest, src); | |
510 | if (ret) { | |
511 | internal_memcpy(shadow_for(dest), shadow_for(src), | |
512 | sizeof(dfsan_label) * (strlen(src) + 1)); | |
513 | } | |
514 | *ret_label = dst_label; | |
515 | return ret; | |
516 | } | |
517 | ||
518 | SANITIZER_INTERFACE_ATTRIBUTE | |
519 | long int __dfsw_strtol(const char *nptr, char **endptr, int base, | |
520 | dfsan_label nptr_label, dfsan_label endptr_label, | |
521 | dfsan_label base_label, dfsan_label *ret_label) { | |
522 | char *tmp_endptr; | |
523 | long int ret = strtol(nptr, &tmp_endptr, base); | |
524 | if (endptr) { | |
525 | *endptr = tmp_endptr; | |
526 | } | |
527 | if (tmp_endptr > nptr) { | |
528 | // If *tmp_endptr is '\0' include its label as well. | |
529 | *ret_label = dfsan_union( | |
530 | base_label, | |
531 | dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); | |
532 | } else { | |
533 | *ret_label = 0; | |
534 | } | |
535 | return ret; | |
536 | } | |
537 | ||
538 | SANITIZER_INTERFACE_ATTRIBUTE | |
539 | double __dfsw_strtod(const char *nptr, char **endptr, | |
540 | dfsan_label nptr_label, dfsan_label endptr_label, | |
541 | dfsan_label *ret_label) { | |
542 | char *tmp_endptr; | |
543 | double ret = strtod(nptr, &tmp_endptr); | |
544 | if (endptr) { | |
545 | *endptr = tmp_endptr; | |
546 | } | |
547 | if (tmp_endptr > nptr) { | |
548 | // If *tmp_endptr is '\0' include its label as well. | |
549 | *ret_label = dfsan_read_label( | |
550 | nptr, | |
551 | tmp_endptr - nptr + (*tmp_endptr ? 0 : 1)); | |
552 | } else { | |
553 | *ret_label = 0; | |
554 | } | |
555 | return ret; | |
556 | } | |
557 | ||
558 | SANITIZER_INTERFACE_ATTRIBUTE | |
559 | long long int __dfsw_strtoll(const char *nptr, char **endptr, int base, | |
560 | dfsan_label nptr_label, dfsan_label endptr_label, | |
561 | dfsan_label base_label, dfsan_label *ret_label) { | |
562 | char *tmp_endptr; | |
563 | long long int ret = strtoll(nptr, &tmp_endptr, base); | |
564 | if (endptr) { | |
565 | *endptr = tmp_endptr; | |
566 | } | |
567 | if (tmp_endptr > nptr) { | |
568 | // If *tmp_endptr is '\0' include its label as well. | |
569 | *ret_label = dfsan_union( | |
570 | base_label, | |
571 | dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); | |
572 | } else { | |
573 | *ret_label = 0; | |
574 | } | |
575 | return ret; | |
576 | } | |
577 | ||
578 | SANITIZER_INTERFACE_ATTRIBUTE | |
579 | unsigned long int __dfsw_strtoul(const char *nptr, char **endptr, int base, | |
580 | dfsan_label nptr_label, dfsan_label endptr_label, | |
581 | dfsan_label base_label, dfsan_label *ret_label) { | |
582 | char *tmp_endptr; | |
583 | unsigned long int ret = strtoul(nptr, &tmp_endptr, base); | |
584 | if (endptr) { | |
585 | *endptr = tmp_endptr; | |
586 | } | |
587 | if (tmp_endptr > nptr) { | |
588 | // If *tmp_endptr is '\0' include its label as well. | |
589 | *ret_label = dfsan_union( | |
590 | base_label, | |
591 | dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); | |
592 | } else { | |
593 | *ret_label = 0; | |
594 | } | |
595 | return ret; | |
596 | } | |
597 | ||
598 | SANITIZER_INTERFACE_ATTRIBUTE | |
599 | long long unsigned int __dfsw_strtoull(const char *nptr, char **endptr, | |
600 | dfsan_label nptr_label, | |
601 | int base, dfsan_label endptr_label, | |
602 | dfsan_label base_label, | |
603 | dfsan_label *ret_label) { | |
604 | char *tmp_endptr; | |
605 | long long unsigned int ret = strtoull(nptr, &tmp_endptr, base); | |
606 | if (endptr) { | |
607 | *endptr = tmp_endptr; | |
608 | } | |
609 | if (tmp_endptr > nptr) { | |
610 | // If *tmp_endptr is '\0' include its label as well. | |
611 | *ret_label = dfsan_union( | |
612 | base_label, | |
613 | dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); | |
614 | } else { | |
615 | *ret_label = 0; | |
616 | } | |
617 | return ret; | |
618 | } | |
619 | ||
620 | SANITIZER_INTERFACE_ATTRIBUTE | |
621 | time_t __dfsw_time(time_t *t, dfsan_label t_label, dfsan_label *ret_label) { | |
622 | time_t ret = time(t); | |
623 | if (ret != (time_t) -1 && t) { | |
624 | dfsan_set_label(0, t, sizeof(time_t)); | |
625 | } | |
626 | *ret_label = 0; | |
627 | return ret; | |
628 | } | |
629 | ||
630 | SANITIZER_INTERFACE_ATTRIBUTE | |
631 | int __dfsw_inet_pton(int af, const char *src, void *dst, dfsan_label af_label, | |
632 | dfsan_label src_label, dfsan_label dst_label, | |
633 | dfsan_label *ret_label) { | |
634 | int ret = inet_pton(af, src, dst); | |
635 | if (ret == 1) { | |
636 | dfsan_set_label(dfsan_read_label(src, strlen(src) + 1), dst, | |
637 | af == AF_INET ? sizeof(struct in_addr) : sizeof(in6_addr)); | |
638 | } | |
639 | *ret_label = 0; | |
640 | return ret; | |
641 | } | |
642 | ||
643 | SANITIZER_INTERFACE_ATTRIBUTE | |
644 | struct tm *__dfsw_localtime_r(const time_t *timep, struct tm *result, | |
645 | dfsan_label timep_label, dfsan_label result_label, | |
646 | dfsan_label *ret_label) { | |
647 | struct tm *ret = localtime_r(timep, result); | |
648 | if (ret) { | |
649 | dfsan_set_label(dfsan_read_label(timep, sizeof(time_t)), result, | |
650 | sizeof(struct tm)); | |
651 | *ret_label = result_label; | |
652 | } else { | |
653 | *ret_label = 0; | |
654 | } | |
655 | return ret; | |
656 | } | |
657 | ||
658 | SANITIZER_INTERFACE_ATTRIBUTE | |
659 | int __dfsw_getpwuid_r(id_t uid, struct passwd *pwd, | |
660 | char *buf, size_t buflen, struct passwd **result, | |
661 | dfsan_label uid_label, dfsan_label pwd_label, | |
662 | dfsan_label buf_label, dfsan_label buflen_label, | |
663 | dfsan_label result_label, dfsan_label *ret_label) { | |
664 | // Store the data in pwd, the strings referenced from pwd in buf, and the | |
665 | // address of pwd in *result. On failure, NULL is stored in *result. | |
666 | int ret = getpwuid_r(uid, pwd, buf, buflen, result); | |
667 | if (ret == 0) { | |
668 | dfsan_set_label(0, pwd, sizeof(struct passwd)); | |
669 | dfsan_set_label(0, buf, strlen(buf) + 1); | |
670 | } | |
671 | *ret_label = 0; | |
672 | dfsan_set_label(0, result, sizeof(struct passwd*)); | |
673 | return ret; | |
674 | } | |
675 | ||
676 | SANITIZER_INTERFACE_ATTRIBUTE | |
677 | int __dfsw_poll(struct pollfd *fds, nfds_t nfds, int timeout, | |
678 | dfsan_label dfs_label, dfsan_label nfds_label, | |
679 | dfsan_label timeout_label, dfsan_label *ret_label) { | |
680 | int ret = poll(fds, nfds, timeout); | |
681 | if (ret >= 0) { | |
682 | for (; nfds > 0; --nfds) { | |
683 | dfsan_set_label(0, &fds[nfds - 1].revents, sizeof(fds[nfds - 1].revents)); | |
684 | } | |
685 | } | |
686 | *ret_label = 0; | |
687 | return ret; | |
688 | } | |
689 | ||
690 | SANITIZER_INTERFACE_ATTRIBUTE | |
691 | int __dfsw_select(int nfds, fd_set *readfds, fd_set *writefds, | |
692 | fd_set *exceptfds, struct timeval *timeout, | |
693 | dfsan_label nfds_label, dfsan_label readfds_label, | |
694 | dfsan_label writefds_label, dfsan_label exceptfds_label, | |
695 | dfsan_label timeout_label, dfsan_label *ret_label) { | |
696 | int ret = select(nfds, readfds, writefds, exceptfds, timeout); | |
697 | // Clear everything (also on error) since their content is either set or | |
698 | // undefined. | |
699 | if (readfds) { | |
700 | dfsan_set_label(0, readfds, sizeof(fd_set)); | |
701 | } | |
702 | if (writefds) { | |
703 | dfsan_set_label(0, writefds, sizeof(fd_set)); | |
704 | } | |
705 | if (exceptfds) { | |
706 | dfsan_set_label(0, exceptfds, sizeof(fd_set)); | |
707 | } | |
708 | dfsan_set_label(0, timeout, sizeof(struct timeval)); | |
709 | *ret_label = 0; | |
710 | return ret; | |
711 | } | |
712 | ||
713 | SANITIZER_INTERFACE_ATTRIBUTE | |
714 | int __dfsw_sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *mask, | |
715 | dfsan_label pid_label, | |
716 | dfsan_label cpusetsize_label, | |
717 | dfsan_label mask_label, dfsan_label *ret_label) { | |
718 | int ret = sched_getaffinity(pid, cpusetsize, mask); | |
719 | if (ret == 0) { | |
720 | dfsan_set_label(0, mask, cpusetsize); | |
721 | } | |
722 | *ret_label = 0; | |
723 | return ret; | |
724 | } | |
725 | ||
726 | SANITIZER_INTERFACE_ATTRIBUTE | |
727 | int __dfsw_sigemptyset(sigset_t *set, dfsan_label set_label, | |
728 | dfsan_label *ret_label) { | |
729 | int ret = sigemptyset(set); | |
730 | dfsan_set_label(0, set, sizeof(sigset_t)); | |
731 | return ret; | |
732 | } | |
733 | ||
734 | SANITIZER_INTERFACE_ATTRIBUTE | |
735 | int __dfsw_sigaction(int signum, const struct sigaction *act, | |
736 | struct sigaction *oldact, dfsan_label signum_label, | |
737 | dfsan_label act_label, dfsan_label oldact_label, | |
738 | dfsan_label *ret_label) { | |
739 | int ret = sigaction(signum, act, oldact); | |
740 | if (oldact) { | |
741 | dfsan_set_label(0, oldact, sizeof(struct sigaction)); | |
742 | } | |
743 | *ret_label = 0; | |
744 | return ret; | |
745 | } | |
746 | ||
747 | SANITIZER_INTERFACE_ATTRIBUTE | |
748 | int __dfsw_gettimeofday(struct timeval *tv, struct timezone *tz, | |
749 | dfsan_label tv_label, dfsan_label tz_label, | |
750 | dfsan_label *ret_label) { | |
751 | int ret = gettimeofday(tv, tz); | |
752 | if (tv) { | |
753 | dfsan_set_label(0, tv, sizeof(struct timeval)); | |
754 | } | |
755 | if (tz) { | |
756 | dfsan_set_label(0, tz, sizeof(struct timezone)); | |
757 | } | |
758 | *ret_label = 0; | |
759 | return ret; | |
760 | } | |
761 | ||
762 | SANITIZER_INTERFACE_ATTRIBUTE void *__dfsw_memchr(void *s, int c, size_t n, | |
763 | dfsan_label s_label, | |
764 | dfsan_label c_label, | |
765 | dfsan_label n_label, | |
766 | dfsan_label *ret_label) { | |
767 | void *ret = memchr(s, c, n); | |
768 | if (flags().strict_data_dependencies) { | |
769 | *ret_label = ret ? s_label : 0; | |
770 | } else { | |
771 | size_t len = | |
772 | ret ? reinterpret_cast<char *>(ret) - reinterpret_cast<char *>(s) + 1 | |
773 | : n; | |
774 | *ret_label = | |
775 | dfsan_union(dfsan_read_label(s, len), dfsan_union(s_label, c_label)); | |
776 | } | |
777 | return ret; | |
778 | } | |
779 | ||
780 | SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strrchr(char *s, int c, | |
781 | dfsan_label s_label, | |
782 | dfsan_label c_label, | |
783 | dfsan_label *ret_label) { | |
784 | char *ret = strrchr(s, c); | |
785 | if (flags().strict_data_dependencies) { | |
786 | *ret_label = ret ? s_label : 0; | |
787 | } else { | |
788 | *ret_label = | |
789 | dfsan_union(dfsan_read_label(s, strlen(s) + 1), | |
790 | dfsan_union(s_label, c_label)); | |
791 | } | |
792 | ||
793 | return ret; | |
794 | } | |
795 | ||
796 | SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strstr(char *haystack, char *needle, | |
797 | dfsan_label haystack_label, | |
798 | dfsan_label needle_label, | |
799 | dfsan_label *ret_label) { | |
800 | char *ret = strstr(haystack, needle); | |
801 | if (flags().strict_data_dependencies) { | |
802 | *ret_label = ret ? haystack_label : 0; | |
803 | } else { | |
804 | size_t len = ret ? ret + strlen(needle) - haystack : strlen(haystack) + 1; | |
805 | *ret_label = | |
806 | dfsan_union(dfsan_read_label(haystack, len), | |
807 | dfsan_union(dfsan_read_label(needle, strlen(needle) + 1), | |
808 | dfsan_union(haystack_label, needle_label))); | |
809 | } | |
810 | ||
811 | return ret; | |
812 | } | |
813 | ||
814 | SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_nanosleep(const struct timespec *req, | |
815 | struct timespec *rem, | |
816 | dfsan_label req_label, | |
817 | dfsan_label rem_label, | |
818 | dfsan_label *ret_label) { | |
819 | int ret = nanosleep(req, rem); | |
820 | *ret_label = 0; | |
821 | if (ret == -1) { | |
822 | // Interrupted by a signal, rem is filled with the remaining time. | |
823 | dfsan_set_label(0, rem, sizeof(struct timespec)); | |
824 | } | |
825 | return ret; | |
826 | } | |
827 | ||
828 | SANITIZER_INTERFACE_ATTRIBUTE int | |
829 | __dfsw_socketpair(int domain, int type, int protocol, int sv[2], | |
830 | dfsan_label domain_label, dfsan_label type_label, | |
831 | dfsan_label protocol_label, dfsan_label sv_label, | |
832 | dfsan_label *ret_label) { | |
833 | int ret = socketpair(domain, type, protocol, sv); | |
834 | *ret_label = 0; | |
835 | if (ret == 0) { | |
836 | dfsan_set_label(0, sv, sizeof(*sv) * 2); | |
837 | } | |
838 | return ret; | |
839 | } | |
840 | ||
841 | // Type of the trampoline function passed to the custom version of | |
842 | // dfsan_set_write_callback. | |
843 | typedef void (*write_trampoline_t)( | |
844 | void *callback, | |
845 | int fd, const void *buf, ssize_t count, | |
846 | dfsan_label fd_label, dfsan_label buf_label, dfsan_label count_label); | |
847 | ||
848 | // Calls to dfsan_set_write_callback() set the values in this struct. | |
849 | // Calls to the custom version of write() read (and invoke) them. | |
850 | static struct { | |
92a42be0 SL |
851 | write_trampoline_t write_callback_trampoline = nullptr; |
852 | void *write_callback = nullptr; | |
1a4d82fc JJ |
853 | } write_callback_info; |
854 | ||
855 | SANITIZER_INTERFACE_ATTRIBUTE void | |
856 | __dfsw_dfsan_set_write_callback( | |
857 | write_trampoline_t write_callback_trampoline, | |
858 | void *write_callback, | |
859 | dfsan_label write_callback_label, | |
860 | dfsan_label *ret_label) { | |
861 | write_callback_info.write_callback_trampoline = write_callback_trampoline; | |
862 | write_callback_info.write_callback = write_callback; | |
863 | } | |
864 | ||
865 | SANITIZER_INTERFACE_ATTRIBUTE int | |
866 | __dfsw_write(int fd, const void *buf, size_t count, | |
867 | dfsan_label fd_label, dfsan_label buf_label, | |
868 | dfsan_label count_label, dfsan_label *ret_label) { | |
92a42be0 | 869 | if (write_callback_info.write_callback) { |
1a4d82fc JJ |
870 | write_callback_info.write_callback_trampoline( |
871 | write_callback_info.write_callback, | |
872 | fd, buf, count, | |
873 | fd_label, buf_label, count_label); | |
874 | } | |
875 | ||
876 | *ret_label = 0; | |
877 | return write(fd, buf, count); | |
878 | } | |
92a42be0 SL |
879 | } // namespace __dfsan |
880 | ||
881 | // Type used to extract a dfsan_label with va_arg() | |
882 | typedef int dfsan_label_va; | |
883 | ||
884 | // Formats a chunk either a constant string or a single format directive (e.g., | |
885 | // '%.3f'). | |
886 | struct Formatter { | |
887 | Formatter(char *str_, const char *fmt_, size_t size_) | |
888 | : str(str_), str_off(0), size(size_), fmt_start(fmt_), fmt_cur(fmt_), | |
889 | width(-1) {} | |
890 | ||
891 | int format() { | |
892 | char *tmp_fmt = build_format_string(); | |
893 | int retval = | |
894 | snprintf(str + str_off, str_off < size ? size - str_off : 0, tmp_fmt, | |
895 | 0 /* used only to avoid warnings */); | |
896 | free(tmp_fmt); | |
897 | return retval; | |
898 | } | |
899 | ||
900 | template <typename T> int format(T arg) { | |
901 | char *tmp_fmt = build_format_string(); | |
902 | int retval; | |
903 | if (width >= 0) { | |
904 | retval = snprintf(str + str_off, str_off < size ? size - str_off : 0, | |
905 | tmp_fmt, width, arg); | |
906 | } else { | |
907 | retval = snprintf(str + str_off, str_off < size ? size - str_off : 0, | |
908 | tmp_fmt, arg); | |
909 | } | |
910 | free(tmp_fmt); | |
911 | return retval; | |
912 | } | |
913 | ||
914 | char *build_format_string() { | |
915 | size_t fmt_size = fmt_cur - fmt_start + 1; | |
916 | char *new_fmt = (char *)malloc(fmt_size + 1); | |
917 | assert(new_fmt); | |
918 | internal_memcpy(new_fmt, fmt_start, fmt_size); | |
919 | new_fmt[fmt_size] = '\0'; | |
920 | return new_fmt; | |
921 | } | |
922 | ||
923 | char *str_cur() { return str + str_off; } | |
924 | ||
925 | size_t num_written_bytes(int retval) { | |
926 | if (retval < 0) { | |
927 | return 0; | |
928 | } | |
929 | ||
930 | size_t num_avail = str_off < size ? size - str_off : 0; | |
931 | if (num_avail == 0) { | |
932 | return 0; | |
933 | } | |
934 | ||
935 | size_t num_written = retval; | |
936 | // A return value of {v,}snprintf of size or more means that the output was | |
937 | // truncated. | |
938 | if (num_written >= num_avail) { | |
939 | num_written -= num_avail; | |
940 | } | |
941 | ||
942 | return num_written; | |
943 | } | |
944 | ||
945 | char *str; | |
946 | size_t str_off; | |
947 | size_t size; | |
948 | const char *fmt_start; | |
949 | const char *fmt_cur; | |
950 | int width; | |
951 | }; | |
952 | ||
953 | // Formats the input and propagates the input labels to the output. The output | |
954 | // is stored in 'str'. 'size' bounds the number of output bytes. 'format' and | |
955 | // 'ap' are the format string and the list of arguments for formatting. Returns | |
956 | // the return value vsnprintf would return. | |
957 | // | |
958 | // The function tokenizes the format string in chunks representing either a | |
959 | // constant string or a single format directive (e.g., '%.3f') and formats each | |
960 | // chunk independently into the output string. This approach allows to figure | |
961 | // out which bytes of the output string depends on which argument and thus to | |
962 | // propagate labels more precisely. | |
963 | // | |
964 | // WARNING: This implementation does not support conversion specifiers with | |
965 | // positional arguments. | |
966 | static int format_buffer(char *str, size_t size, const char *fmt, | |
967 | dfsan_label *va_labels, dfsan_label *ret_label, | |
968 | va_list ap) { | |
969 | Formatter formatter(str, fmt, size); | |
970 | ||
971 | while (*formatter.fmt_cur) { | |
972 | formatter.fmt_start = formatter.fmt_cur; | |
973 | formatter.width = -1; | |
974 | int retval = 0; | |
975 | ||
976 | if (*formatter.fmt_cur != '%') { | |
977 | // Ordinary character. Consume all the characters until a '%' or the end | |
978 | // of the string. | |
979 | for (; *(formatter.fmt_cur + 1) && *(formatter.fmt_cur + 1) != '%'; | |
980 | ++formatter.fmt_cur) {} | |
981 | retval = formatter.format(); | |
982 | dfsan_set_label(0, formatter.str_cur(), | |
983 | formatter.num_written_bytes(retval)); | |
984 | } else { | |
985 | // Conversion directive. Consume all the characters until a conversion | |
986 | // specifier or the end of the string. | |
987 | bool end_fmt = false; | |
988 | for (; *formatter.fmt_cur && !end_fmt; ) { | |
989 | switch (*++formatter.fmt_cur) { | |
990 | case 'd': | |
991 | case 'i': | |
992 | case 'o': | |
993 | case 'u': | |
994 | case 'x': | |
995 | case 'X': | |
996 | switch (*(formatter.fmt_cur - 1)) { | |
997 | case 'h': | |
998 | // Also covers the 'hh' case (since the size of the arg is still | |
999 | // an int). | |
1000 | retval = formatter.format(va_arg(ap, int)); | |
1001 | break; | |
1002 | case 'l': | |
1003 | if (formatter.fmt_cur - formatter.fmt_start >= 2 && | |
1004 | *(formatter.fmt_cur - 2) == 'l') { | |
1005 | retval = formatter.format(va_arg(ap, long long int)); | |
1006 | } else { | |
1007 | retval = formatter.format(va_arg(ap, long int)); | |
1008 | } | |
1009 | break; | |
1010 | case 'q': | |
1011 | retval = formatter.format(va_arg(ap, long long int)); | |
1012 | break; | |
1013 | case 'j': | |
1014 | retval = formatter.format(va_arg(ap, intmax_t)); | |
1015 | break; | |
1016 | case 'z': | |
1017 | case 't': | |
1018 | retval = formatter.format(va_arg(ap, size_t)); | |
1019 | break; | |
1020 | default: | |
1021 | retval = formatter.format(va_arg(ap, int)); | |
1022 | } | |
1023 | dfsan_set_label(*va_labels++, formatter.str_cur(), | |
1024 | formatter.num_written_bytes(retval)); | |
1025 | end_fmt = true; | |
1026 | break; | |
1027 | ||
1028 | case 'a': | |
1029 | case 'A': | |
1030 | case 'e': | |
1031 | case 'E': | |
1032 | case 'f': | |
1033 | case 'F': | |
1034 | case 'g': | |
1035 | case 'G': | |
1036 | if (*(formatter.fmt_cur - 1) == 'L') { | |
1037 | retval = formatter.format(va_arg(ap, long double)); | |
1038 | } else { | |
1039 | retval = formatter.format(va_arg(ap, double)); | |
1040 | } | |
1041 | dfsan_set_label(*va_labels++, formatter.str_cur(), | |
1042 | formatter.num_written_bytes(retval)); | |
1043 | end_fmt = true; | |
1044 | break; | |
1045 | ||
1046 | case 'c': | |
1047 | retval = formatter.format(va_arg(ap, int)); | |
1048 | dfsan_set_label(*va_labels++, formatter.str_cur(), | |
1049 | formatter.num_written_bytes(retval)); | |
1050 | end_fmt = true; | |
1051 | break; | |
1052 | ||
1053 | case 's': { | |
1054 | char *arg = va_arg(ap, char *); | |
1055 | retval = formatter.format(arg); | |
1056 | va_labels++; | |
1057 | internal_memcpy(shadow_for(formatter.str_cur()), shadow_for(arg), | |
1058 | sizeof(dfsan_label) * | |
1059 | formatter.num_written_bytes(retval)); | |
1060 | end_fmt = true; | |
1061 | break; | |
1062 | } | |
1063 | ||
1064 | case 'p': | |
1065 | retval = formatter.format(va_arg(ap, void *)); | |
1066 | dfsan_set_label(*va_labels++, formatter.str_cur(), | |
1067 | formatter.num_written_bytes(retval)); | |
1068 | end_fmt = true; | |
1069 | break; | |
1070 | ||
1071 | case 'n': { | |
1072 | int *ptr = va_arg(ap, int *); | |
1073 | *ptr = (int)formatter.str_off; | |
1074 | va_labels++; | |
1075 | dfsan_set_label(0, ptr, sizeof(ptr)); | |
1076 | end_fmt = true; | |
1077 | break; | |
1078 | } | |
1079 | ||
1080 | case '%': | |
1081 | retval = formatter.format(); | |
1082 | dfsan_set_label(0, formatter.str_cur(), | |
1083 | formatter.num_written_bytes(retval)); | |
1084 | end_fmt = true; | |
1085 | break; | |
1086 | ||
1087 | case '*': | |
1088 | formatter.width = va_arg(ap, int); | |
1089 | va_labels++; | |
1090 | break; | |
1091 | ||
1092 | default: | |
1093 | break; | |
1094 | } | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | if (retval < 0) { | |
1099 | return retval; | |
1100 | } | |
1101 | ||
1102 | formatter.fmt_cur++; | |
1103 | formatter.str_off += retval; | |
1104 | } | |
1105 | ||
1106 | *ret_label = 0; | |
1107 | ||
1108 | // Number of bytes written in total. | |
1109 | return formatter.str_off; | |
1110 | } | |
1111 | ||
1112 | extern "C" { | |
1113 | SANITIZER_INTERFACE_ATTRIBUTE | |
1114 | int __dfsw_sprintf(char *str, const char *format, dfsan_label str_label, | |
1115 | dfsan_label format_label, dfsan_label *va_labels, | |
1116 | dfsan_label *ret_label, ...) { | |
1117 | va_list ap; | |
1118 | va_start(ap, ret_label); | |
1119 | int ret = format_buffer(str, ~0ul, format, va_labels, ret_label, ap); | |
1120 | va_end(ap); | |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | SANITIZER_INTERFACE_ATTRIBUTE | |
1125 | int __dfsw_snprintf(char *str, size_t size, const char *format, | |
1126 | dfsan_label str_label, dfsan_label size_label, | |
1127 | dfsan_label format_label, dfsan_label *va_labels, | |
1128 | dfsan_label *ret_label, ...) { | |
1129 | va_list ap; | |
1130 | va_start(ap, ret_label); | |
1131 | int ret = format_buffer(str, size, format, va_labels, ret_label, ap); | |
1132 | va_end(ap); | |
1133 | return ret; | |
1a4d82fc | 1134 | } |
92a42be0 | 1135 | } // extern "C" |