| //===-- dfsan.cc ----------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of DataFlowSanitizer. |
| // |
| // This file defines the custom functions listed in done_abilist.txt. |
| //===----------------------------------------------------------------------===// |
| |
| #include "sanitizer_common/sanitizer_common.h" |
| #include "sanitizer_common/sanitizer_internal_defs.h" |
| #include "sanitizer_common/sanitizer_linux.h" |
| |
| #include "dfsan/dfsan.h" |
| |
| #include <arpa/inet.h> |
| #include <assert.h> |
| #include <ctype.h> |
| #include <dlfcn.h> |
| #include <link.h> |
| #include <poll.h> |
| #include <pthread.h> |
| #include <pwd.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/resource.h> |
| #include <sys/select.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| using namespace __dfsan; |
| |
| #define CALL_WEAK_INTERCEPTOR_HOOK(f, ...) \ |
| do { \ |
| if (f) \ |
| f(__VA_ARGS__); \ |
| } while (false) |
| #define DECLARE_WEAK_INTERCEPTOR_HOOK(f, ...) \ |
| SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void f(__VA_ARGS__); |
| |
| extern "C" { |
| SANITIZER_INTERFACE_ATTRIBUTE int |
| __dfsw_stat(const char *path, struct stat *buf, dfsan_label path_label, |
| dfsan_label buf_label, dfsan_label *ret_label) { |
| int ret = stat(path, buf); |
| if (ret == 0) |
| dfsan_set_label(0, buf, sizeof(struct stat)); |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_fstat(int fd, struct stat *buf, |
| dfsan_label fd_label, |
| dfsan_label buf_label, |
| dfsan_label *ret_label) { |
| int ret = fstat(fd, buf); |
| if (ret == 0) |
| dfsan_set_label(0, buf, sizeof(struct stat)); |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strchr(const char *s, int c, |
| dfsan_label s_label, |
| dfsan_label c_label, |
| dfsan_label *ret_label) { |
| for (size_t i = 0;; ++i) { |
| if (s[i] == c || s[i] == 0) { |
| if (flags().strict_data_dependencies) { |
| *ret_label = s_label; |
| } else { |
| *ret_label = dfsan_union(dfsan_read_label(s, i + 1), |
| dfsan_union(s_label, c_label)); |
| } |
| return s[i] == 0 ? nullptr : const_cast<char *>(s+i); |
| } |
| } |
| } |
| |
| DECLARE_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_memcmp, uptr caller_pc, |
| const void *s1, const void *s2, size_t n, |
| dfsan_label s1_label, dfsan_label s2_label, |
| dfsan_label n_label) |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __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) { |
| CALL_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_memcmp, GET_CALLER_PC(), s1, s2, n, |
| s1_label, s2_label, n_label); |
| const char *cs1 = (const char *) s1, *cs2 = (const char *) s2; |
| for (size_t i = 0; i != n; ++i) { |
| if (cs1[i] != cs2[i]) { |
| if (flags().strict_data_dependencies) { |
| *ret_label = 0; |
| } else { |
| *ret_label = dfsan_union(dfsan_read_label(cs1, i + 1), |
| dfsan_read_label(cs2, i + 1)); |
| } |
| return cs1[i] - cs2[i]; |
| } |
| } |
| |
| if (flags().strict_data_dependencies) { |
| *ret_label = 0; |
| } else { |
| *ret_label = dfsan_union(dfsan_read_label(cs1, n), |
| dfsan_read_label(cs2, n)); |
| } |
| return 0; |
| } |
| |
| DECLARE_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strcmp, uptr caller_pc, |
| const char *s1, const char *s2, |
| dfsan_label s1_label, dfsan_label s2_label) |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strcmp(const char *s1, const char *s2, |
| dfsan_label s1_label, |
| dfsan_label s2_label, |
| dfsan_label *ret_label) { |
| CALL_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strcmp, GET_CALLER_PC(), s1, s2, |
| s1_label, s2_label); |
| for (size_t i = 0;; ++i) { |
| if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0) { |
| if (flags().strict_data_dependencies) { |
| *ret_label = 0; |
| } else { |
| *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), |
| dfsan_read_label(s2, i + 1)); |
| } |
| return s1[i] - s2[i]; |
| } |
| } |
| return 0; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int |
| __dfsw_strcasecmp(const char *s1, const char *s2, dfsan_label s1_label, |
| dfsan_label s2_label, dfsan_label *ret_label) { |
| for (size_t i = 0;; ++i) { |
| if (tolower(s1[i]) != tolower(s2[i]) || s1[i] == 0 || s2[i] == 0) { |
| if (flags().strict_data_dependencies) { |
| *ret_label = 0; |
| } else { |
| *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), |
| dfsan_read_label(s2, i + 1)); |
| } |
| return s1[i] - s2[i]; |
| } |
| } |
| return 0; |
| } |
| |
| DECLARE_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strncmp, uptr caller_pc, |
| const char *s1, const char *s2, size_t n, |
| dfsan_label s1_label, dfsan_label s2_label, |
| dfsan_label n_label) |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __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) { |
| if (n == 0) { |
| *ret_label = 0; |
| return 0; |
| } |
| |
| CALL_WEAK_INTERCEPTOR_HOOK(dfsan_weak_hook_strncmp, GET_CALLER_PC(), s1, s2, |
| n, s1_label, s2_label, n_label); |
| |
| for (size_t i = 0;; ++i) { |
| if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0 || i == n - 1) { |
| if (flags().strict_data_dependencies) { |
| *ret_label = 0; |
| } else { |
| *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), |
| dfsan_read_label(s2, i + 1)); |
| } |
| return s1[i] - s2[i]; |
| } |
| } |
| return 0; |
| } |
| |
| 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) { |
| if (n == 0) { |
| *ret_label = 0; |
| return 0; |
| } |
| |
| for (size_t i = 0;; ++i) { |
| if (tolower(s1[i]) != tolower(s2[i]) || s1[i] == 0 || s2[i] == 0 || |
| i == n - 1) { |
| if (flags().strict_data_dependencies) { |
| *ret_label = 0; |
| } else { |
| *ret_label = dfsan_union(dfsan_read_label(s1, i + 1), |
| dfsan_read_label(s2, i + 1)); |
| } |
| return s1[i] - s2[i]; |
| } |
| } |
| return 0; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE void *__dfsw_calloc(size_t nmemb, size_t size, |
| dfsan_label nmemb_label, |
| dfsan_label size_label, |
| dfsan_label *ret_label) { |
| void *p = calloc(nmemb, size); |
| dfsan_set_label(0, p, nmemb * size); |
| *ret_label = 0; |
| return p; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE size_t |
| __dfsw_strlen(const char *s, dfsan_label s_label, dfsan_label *ret_label) { |
| size_t ret = strlen(s); |
| if (flags().strict_data_dependencies) { |
| *ret_label = 0; |
| } else { |
| *ret_label = dfsan_read_label(s, ret + 1); |
| } |
| return ret; |
| } |
| |
| |
| static void *dfsan_memcpy(void *dest, const void *src, size_t n) { |
| dfsan_label *sdest = shadow_for(dest); |
| const dfsan_label *ssrc = shadow_for(src); |
| internal_memcpy((void *)sdest, (const void *)ssrc, n * sizeof(dfsan_label)); |
| return internal_memcpy(dest, src, n); |
| } |
| |
| static void dfsan_memset(void *s, int c, dfsan_label c_label, size_t n) { |
| internal_memset(s, c, n); |
| dfsan_set_label(c_label, s, n); |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| void *__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) { |
| *ret_label = dest_label; |
| return dfsan_memcpy(dest, src, n); |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| void *__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) { |
| dfsan_memset(s, c, c_label, n); |
| *ret_label = s_label; |
| return s; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE char * |
| __dfsw_strdup(const char *s, dfsan_label s_label, dfsan_label *ret_label) { |
| size_t len = strlen(s); |
| void *p = malloc(len+1); |
| dfsan_memcpy(p, s, len+1); |
| *ret_label = 0; |
| return static_cast<char *>(p); |
| } |
| |
| 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) { |
| size_t len = strlen(s2); |
| if (len < n) { |
| dfsan_memcpy(s1, s2, len+1); |
| dfsan_memset(s1+len+1, 0, 0, n-len-1); |
| } else { |
| dfsan_memcpy(s1, s2, n); |
| } |
| |
| *ret_label = s1_label; |
| return s1; |
| } |
| |
| 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) { |
| ssize_t ret = pread(fd, buf, count, offset); |
| if (ret > 0) |
| dfsan_set_label(0, buf, ret); |
| *ret_label = 0; |
| return ret; |
| } |
| |
| 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) { |
| ssize_t ret = read(fd, buf, count); |
| if (ret > 0) |
| dfsan_set_label(0, buf, ret); |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_clock_gettime(clockid_t clk_id, |
| struct timespec *tp, |
| dfsan_label clk_id_label, |
| dfsan_label tp_label, |
| dfsan_label *ret_label) { |
| int ret = clock_gettime(clk_id, tp); |
| if (ret == 0) |
| dfsan_set_label(0, tp, sizeof(struct timespec)); |
| *ret_label = 0; |
| return ret; |
| } |
| |
| static void unpoison(const void *ptr, uptr size) { |
| dfsan_set_label(0, const_cast<void *>(ptr), size); |
| } |
| |
| // dlopen() ultimately calls mmap() down inside the loader, which generally |
| // doesn't participate in dynamic symbol resolution. Therefore we won't |
| // intercept its calls to mmap, and we have to hook it here. |
| SANITIZER_INTERFACE_ATTRIBUTE void * |
| __dfsw_dlopen(const char *filename, int flag, dfsan_label filename_label, |
| dfsan_label flag_label, dfsan_label *ret_label) { |
| void *handle = dlopen(filename, flag); |
| link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE(handle); |
| if (map) |
| ForEachMappedRegion(map, unpoison); |
| *ret_label = 0; |
| return handle; |
| } |
| |
| struct pthread_create_info { |
| void *(*start_routine_trampoline)(void *, void *, dfsan_label, dfsan_label *); |
| void *start_routine; |
| void *arg; |
| }; |
| |
| static void *pthread_create_cb(void *p) { |
| pthread_create_info pci(*(pthread_create_info *)p); |
| free(p); |
| dfsan_label ret_label; |
| return pci.start_routine_trampoline(pci.start_routine, pci.arg, 0, |
| &ret_label); |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __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) { |
| pthread_create_info *pci = |
| (pthread_create_info *)malloc(sizeof(pthread_create_info)); |
| pci->start_routine_trampoline = start_routine_trampoline; |
| pci->start_routine = start_routine; |
| pci->arg = arg; |
| int rv = pthread_create(thread, attr, pthread_create_cb, (void *)pci); |
| if (rv != 0) |
| free(pci); |
| *ret_label = 0; |
| return rv; |
| } |
| |
| struct dl_iterate_phdr_info { |
| 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; |
| }; |
| |
| int dl_iterate_phdr_cb(struct dl_phdr_info *info, size_t size, void *data) { |
| dl_iterate_phdr_info *dipi = (dl_iterate_phdr_info *)data; |
| dfsan_set_label(0, *info); |
| dfsan_set_label(0, const_cast<char *>(info->dlpi_name), |
| strlen(info->dlpi_name) + 1); |
| dfsan_set_label( |
| 0, const_cast<char *>(reinterpret_cast<const char *>(info->dlpi_phdr)), |
| sizeof(*info->dlpi_phdr) * info->dlpi_phnum); |
| dfsan_label ret_label; |
| return dipi->callback_trampoline(dipi->callback, info, size, dipi->data, 0, 0, |
| 0, &ret_label); |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __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) { |
| dl_iterate_phdr_info dipi = { callback_trampoline, callback, data }; |
| *ret_label = 0; |
| return dl_iterate_phdr(dl_iterate_phdr_cb, &dipi); |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| char *__dfsw_ctime_r(const time_t *timep, char *buf, dfsan_label timep_label, |
| dfsan_label buf_label, dfsan_label *ret_label) { |
| char *ret = ctime_r(timep, buf); |
| if (ret) { |
| dfsan_set_label(dfsan_read_label(timep, sizeof(time_t)), buf, |
| strlen(buf) + 1); |
| *ret_label = buf_label; |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| char *__dfsw_fgets(char *s, int size, FILE *stream, dfsan_label s_label, |
| dfsan_label size_label, dfsan_label stream_label, |
| dfsan_label *ret_label) { |
| char *ret = fgets(s, size, stream); |
| if (ret) { |
| dfsan_set_label(0, ret, strlen(ret) + 1); |
| *ret_label = s_label; |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| char *__dfsw_getcwd(char *buf, size_t size, dfsan_label buf_label, |
| dfsan_label size_label, dfsan_label *ret_label) { |
| char *ret = getcwd(buf, size); |
| if (ret) { |
| dfsan_set_label(0, ret, strlen(ret) + 1); |
| *ret_label = buf_label; |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| char *__dfsw_get_current_dir_name(dfsan_label *ret_label) { |
| char *ret = get_current_dir_name(); |
| if (ret) { |
| dfsan_set_label(0, ret, strlen(ret) + 1); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __dfsw_gethostname(char *name, size_t len, dfsan_label name_label, |
| dfsan_label len_label, dfsan_label *ret_label) { |
| int ret = gethostname(name, len); |
| if (ret == 0) { |
| dfsan_set_label(0, name, strlen(name) + 1); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __dfsw_getrlimit(int resource, struct rlimit *rlim, |
| dfsan_label resource_label, dfsan_label rlim_label, |
| dfsan_label *ret_label) { |
| int ret = getrlimit(resource, rlim); |
| if (ret == 0) { |
| dfsan_set_label(0, rlim, sizeof(struct rlimit)); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __dfsw_getrusage(int who, struct rusage *usage, dfsan_label who_label, |
| dfsan_label usage_label, dfsan_label *ret_label) { |
| int ret = getrusage(who, usage); |
| if (ret == 0) { |
| dfsan_set_label(0, usage, sizeof(struct rusage)); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| char *__dfsw_strcpy(char *dest, const char *src, dfsan_label dst_label, |
| dfsan_label src_label, dfsan_label *ret_label) { |
| char *ret = strcpy(dest, src); |
| if (ret) { |
| internal_memcpy(shadow_for(dest), shadow_for(src), |
| sizeof(dfsan_label) * (strlen(src) + 1)); |
| } |
| *ret_label = dst_label; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| long int __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) { |
| char *tmp_endptr; |
| long int ret = strtol(nptr, &tmp_endptr, base); |
| if (endptr) { |
| *endptr = tmp_endptr; |
| } |
| if (tmp_endptr > nptr) { |
| // If *tmp_endptr is '\0' include its label as well. |
| *ret_label = dfsan_union( |
| base_label, |
| dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| double __dfsw_strtod(const char *nptr, char **endptr, |
| dfsan_label nptr_label, dfsan_label endptr_label, |
| dfsan_label *ret_label) { |
| char *tmp_endptr; |
| double ret = strtod(nptr, &tmp_endptr); |
| if (endptr) { |
| *endptr = tmp_endptr; |
| } |
| if (tmp_endptr > nptr) { |
| // If *tmp_endptr is '\0' include its label as well. |
| *ret_label = dfsan_read_label( |
| nptr, |
| tmp_endptr - nptr + (*tmp_endptr ? 0 : 1)); |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| long long int __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) { |
| char *tmp_endptr; |
| long long int ret = strtoll(nptr, &tmp_endptr, base); |
| if (endptr) { |
| *endptr = tmp_endptr; |
| } |
| if (tmp_endptr > nptr) { |
| // If *tmp_endptr is '\0' include its label as well. |
| *ret_label = dfsan_union( |
| base_label, |
| dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| unsigned long int __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) { |
| char *tmp_endptr; |
| unsigned long int ret = strtoul(nptr, &tmp_endptr, base); |
| if (endptr) { |
| *endptr = tmp_endptr; |
| } |
| if (tmp_endptr > nptr) { |
| // If *tmp_endptr is '\0' include its label as well. |
| *ret_label = dfsan_union( |
| base_label, |
| dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| long long unsigned int __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) { |
| char *tmp_endptr; |
| long long unsigned int ret = strtoull(nptr, &tmp_endptr, base); |
| if (endptr) { |
| *endptr = tmp_endptr; |
| } |
| if (tmp_endptr > nptr) { |
| // If *tmp_endptr is '\0' include its label as well. |
| *ret_label = dfsan_union( |
| base_label, |
| dfsan_read_label(nptr, tmp_endptr - nptr + (*tmp_endptr ? 0 : 1))); |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| time_t __dfsw_time(time_t *t, dfsan_label t_label, dfsan_label *ret_label) { |
| time_t ret = time(t); |
| if (ret != (time_t) -1 && t) { |
| dfsan_set_label(0, t, sizeof(time_t)); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __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) { |
| int ret = inet_pton(af, src, dst); |
| if (ret == 1) { |
| dfsan_set_label(dfsan_read_label(src, strlen(src) + 1), dst, |
| af == AF_INET ? sizeof(struct in_addr) : sizeof(in6_addr)); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| struct tm *__dfsw_localtime_r(const time_t *timep, struct tm *result, |
| dfsan_label timep_label, dfsan_label result_label, |
| dfsan_label *ret_label) { |
| struct tm *ret = localtime_r(timep, result); |
| if (ret) { |
| dfsan_set_label(dfsan_read_label(timep, sizeof(time_t)), result, |
| sizeof(struct tm)); |
| *ret_label = result_label; |
| } else { |
| *ret_label = 0; |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __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) { |
| // Store the data in pwd, the strings referenced from pwd in buf, and the |
| // address of pwd in *result. On failure, NULL is stored in *result. |
| int ret = getpwuid_r(uid, pwd, buf, buflen, result); |
| if (ret == 0) { |
| dfsan_set_label(0, pwd, sizeof(struct passwd)); |
| dfsan_set_label(0, buf, strlen(buf) + 1); |
| } |
| *ret_label = 0; |
| dfsan_set_label(0, result, sizeof(struct passwd*)); |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __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) { |
| int ret = poll(fds, nfds, timeout); |
| if (ret >= 0) { |
| for (; nfds > 0; --nfds) { |
| dfsan_set_label(0, &fds[nfds - 1].revents, sizeof(fds[nfds - 1].revents)); |
| } |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __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) { |
| int ret = select(nfds, readfds, writefds, exceptfds, timeout); |
| // Clear everything (also on error) since their content is either set or |
| // undefined. |
| if (readfds) { |
| dfsan_set_label(0, readfds, sizeof(fd_set)); |
| } |
| if (writefds) { |
| dfsan_set_label(0, writefds, sizeof(fd_set)); |
| } |
| if (exceptfds) { |
| dfsan_set_label(0, exceptfds, sizeof(fd_set)); |
| } |
| dfsan_set_label(0, timeout, sizeof(struct timeval)); |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __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) { |
| int ret = sched_getaffinity(pid, cpusetsize, mask); |
| if (ret == 0) { |
| dfsan_set_label(0, mask, cpusetsize); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __dfsw_sigemptyset(sigset_t *set, dfsan_label set_label, |
| dfsan_label *ret_label) { |
| int ret = sigemptyset(set); |
| dfsan_set_label(0, set, sizeof(sigset_t)); |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __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) { |
| int ret = sigaction(signum, act, oldact); |
| if (oldact) { |
| dfsan_set_label(0, oldact, sizeof(struct sigaction)); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __dfsw_gettimeofday(struct timeval *tv, struct timezone *tz, |
| dfsan_label tv_label, dfsan_label tz_label, |
| dfsan_label *ret_label) { |
| int ret = gettimeofday(tv, tz); |
| if (tv) { |
| dfsan_set_label(0, tv, sizeof(struct timeval)); |
| } |
| if (tz) { |
| dfsan_set_label(0, tz, sizeof(struct timezone)); |
| } |
| *ret_label = 0; |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE void *__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) { |
| void *ret = memchr(s, c, n); |
| if (flags().strict_data_dependencies) { |
| *ret_label = ret ? s_label : 0; |
| } else { |
| size_t len = |
| ret ? reinterpret_cast<char *>(ret) - reinterpret_cast<char *>(s) + 1 |
| : n; |
| *ret_label = |
| dfsan_union(dfsan_read_label(s, len), dfsan_union(s_label, c_label)); |
| } |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strrchr(char *s, int c, |
| dfsan_label s_label, |
| dfsan_label c_label, |
| dfsan_label *ret_label) { |
| char *ret = strrchr(s, c); |
| if (flags().strict_data_dependencies) { |
| *ret_label = ret ? s_label : 0; |
| } else { |
| *ret_label = |
| dfsan_union(dfsan_read_label(s, strlen(s) + 1), |
| dfsan_union(s_label, c_label)); |
| } |
| |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strstr(char *haystack, char *needle, |
| dfsan_label haystack_label, |
| dfsan_label needle_label, |
| dfsan_label *ret_label) { |
| char *ret = strstr(haystack, needle); |
| if (flags().strict_data_dependencies) { |
| *ret_label = ret ? haystack_label : 0; |
| } else { |
| size_t len = ret ? ret + strlen(needle) - haystack : strlen(haystack) + 1; |
| *ret_label = |
| dfsan_union(dfsan_read_label(haystack, len), |
| dfsan_union(dfsan_read_label(needle, strlen(needle) + 1), |
| dfsan_union(haystack_label, needle_label))); |
| } |
| |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_nanosleep(const struct timespec *req, |
| struct timespec *rem, |
| dfsan_label req_label, |
| dfsan_label rem_label, |
| dfsan_label *ret_label) { |
| int ret = nanosleep(req, rem); |
| *ret_label = 0; |
| if (ret == -1) { |
| // Interrupted by a signal, rem is filled with the remaining time. |
| dfsan_set_label(0, rem, sizeof(struct timespec)); |
| } |
| return ret; |
| } |
| |
| 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) { |
| int ret = socketpair(domain, type, protocol, sv); |
| *ret_label = 0; |
| if (ret == 0) { |
| dfsan_set_label(0, sv, sizeof(*sv) * 2); |
| } |
| return ret; |
| } |
| |
| // Type of the trampoline function passed to the custom version of |
| // dfsan_set_write_callback. |
| typedef void (*write_trampoline_t)( |
| void *callback, |
| int fd, const void *buf, ssize_t count, |
| dfsan_label fd_label, dfsan_label buf_label, dfsan_label count_label); |
| |
| // Calls to dfsan_set_write_callback() set the values in this struct. |
| // Calls to the custom version of write() read (and invoke) them. |
| static struct { |
| write_trampoline_t write_callback_trampoline = nullptr; |
| void *write_callback = nullptr; |
| } write_callback_info; |
| |
| 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) { |
| write_callback_info.write_callback_trampoline = write_callback_trampoline; |
| write_callback_info.write_callback = write_callback; |
| } |
| |
| 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) { |
| if (write_callback_info.write_callback) { |
| write_callback_info.write_callback_trampoline( |
| write_callback_info.write_callback, |
| fd, buf, count, |
| fd_label, buf_label, count_label); |
| } |
| |
| *ret_label = 0; |
| return write(fd, buf, count); |
| } |
| } // namespace __dfsan |
| |
| // Type used to extract a dfsan_label with va_arg() |
| typedef int dfsan_label_va; |
| |
| // Formats a chunk either a constant string or a single format directive (e.g., |
| // '%.3f'). |
| struct Formatter { |
| Formatter(char *str_, const char *fmt_, size_t size_) |
| : str(str_), str_off(0), size(size_), fmt_start(fmt_), fmt_cur(fmt_), |
| width(-1) {} |
| |
| int format() { |
| char *tmp_fmt = build_format_string(); |
| int retval = |
| snprintf(str + str_off, str_off < size ? size - str_off : 0, tmp_fmt, |
| 0 /* used only to avoid warnings */); |
| free(tmp_fmt); |
| return retval; |
| } |
| |
| template <typename T> int format(T arg) { |
| char *tmp_fmt = build_format_string(); |
| int retval; |
| if (width >= 0) { |
| retval = snprintf(str + str_off, str_off < size ? size - str_off : 0, |
| tmp_fmt, width, arg); |
| } else { |
| retval = snprintf(str + str_off, str_off < size ? size - str_off : 0, |
| tmp_fmt, arg); |
| } |
| free(tmp_fmt); |
| return retval; |
| } |
| |
| char *build_format_string() { |
| size_t fmt_size = fmt_cur - fmt_start + 1; |
| char *new_fmt = (char *)malloc(fmt_size + 1); |
| assert(new_fmt); |
| internal_memcpy(new_fmt, fmt_start, fmt_size); |
| new_fmt[fmt_size] = '\0'; |
| return new_fmt; |
| } |
| |
| char *str_cur() { return str + str_off; } |
| |
| size_t num_written_bytes(int retval) { |
| if (retval < 0) { |
| return 0; |
| } |
| |
| size_t num_avail = str_off < size ? size - str_off : 0; |
| if (num_avail == 0) { |
| return 0; |
| } |
| |
| size_t num_written = retval; |
| // A return value of {v,}snprintf of size or more means that the output was |
| // truncated. |
| if (num_written >= num_avail) { |
| num_written -= num_avail; |
| } |
| |
| return num_written; |
| } |
| |
| char *str; |
| size_t str_off; |
| size_t size; |
| const char *fmt_start; |
| const char *fmt_cur; |
| int width; |
| }; |
| |
| // Formats the input and propagates the input labels to the output. The output |
| // is stored in 'str'. 'size' bounds the number of output bytes. 'format' and |
| // 'ap' are the format string and the list of arguments for formatting. Returns |
| // the return value vsnprintf would return. |
| // |
| // The function tokenizes the format string in chunks representing either a |
| // constant string or a single format directive (e.g., '%.3f') and formats each |
| // chunk independently into the output string. This approach allows to figure |
| // out which bytes of the output string depends on which argument and thus to |
| // propagate labels more precisely. |
| // |
| // WARNING: This implementation does not support conversion specifiers with |
| // positional arguments. |
| static int format_buffer(char *str, size_t size, const char *fmt, |
| dfsan_label *va_labels, dfsan_label *ret_label, |
| va_list ap) { |
| Formatter formatter(str, fmt, size); |
| |
| while (*formatter.fmt_cur) { |
| formatter.fmt_start = formatter.fmt_cur; |
| formatter.width = -1; |
| int retval = 0; |
| |
| if (*formatter.fmt_cur != '%') { |
| // Ordinary character. Consume all the characters until a '%' or the end |
| // of the string. |
| for (; *(formatter.fmt_cur + 1) && *(formatter.fmt_cur + 1) != '%'; |
| ++formatter.fmt_cur) {} |
| retval = formatter.format(); |
| dfsan_set_label(0, formatter.str_cur(), |
| formatter.num_written_bytes(retval)); |
| } else { |
| // Conversion directive. Consume all the characters until a conversion |
| // specifier or the end of the string. |
| bool end_fmt = false; |
| for (; *formatter.fmt_cur && !end_fmt; ) { |
| switch (*++formatter.fmt_cur) { |
| case 'd': |
| case 'i': |
| case 'o': |
| case 'u': |
| case 'x': |
| case 'X': |
| switch (*(formatter.fmt_cur - 1)) { |
| case 'h': |
| // Also covers the 'hh' case (since the size of the arg is still |
| // an int). |
| retval = formatter.format(va_arg(ap, int)); |
| break; |
| case 'l': |
| if (formatter.fmt_cur - formatter.fmt_start >= 2 && |
| *(formatter.fmt_cur - 2) == 'l') { |
| retval = formatter.format(va_arg(ap, long long int)); |
| } else { |
| retval = formatter.format(va_arg(ap, long int)); |
| } |
| break; |
| case 'q': |
| retval = formatter.format(va_arg(ap, long long int)); |
| break; |
| case 'j': |
| retval = formatter.format(va_arg(ap, intmax_t)); |
| break; |
| case 'z': |
| case 't': |
| retval = formatter.format(va_arg(ap, size_t)); |
| break; |
| default: |
| retval = formatter.format(va_arg(ap, int)); |
| } |
| dfsan_set_label(*va_labels++, formatter.str_cur(), |
| formatter.num_written_bytes(retval)); |
| end_fmt = true; |
| break; |
| |
| case 'a': |
| case 'A': |
| case 'e': |
| case 'E': |
| case 'f': |
| case 'F': |
| case 'g': |
| case 'G': |
| if (*(formatter.fmt_cur - 1) == 'L') { |
| retval = formatter.format(va_arg(ap, long double)); |
| } else { |
| retval = formatter.format(va_arg(ap, double)); |
| } |
| dfsan_set_label(*va_labels++, formatter.str_cur(), |
| formatter.num_written_bytes(retval)); |
| end_fmt = true; |
| break; |
| |
| case 'c': |
| retval = formatter.format(va_arg(ap, int)); |
| dfsan_set_label(*va_labels++, formatter.str_cur(), |
| formatter.num_written_bytes(retval)); |
| end_fmt = true; |
| break; |
| |
| case 's': { |
| char *arg = va_arg(ap, char *); |
| retval = formatter.format(arg); |
| va_labels++; |
| internal_memcpy(shadow_for(formatter.str_cur()), shadow_for(arg), |
| sizeof(dfsan_label) * |
| formatter.num_written_bytes(retval)); |
| end_fmt = true; |
| break; |
| } |
| |
| case 'p': |
| retval = formatter.format(va_arg(ap, void *)); |
| dfsan_set_label(*va_labels++, formatter.str_cur(), |
| formatter.num_written_bytes(retval)); |
| end_fmt = true; |
| break; |
| |
| case 'n': { |
| int *ptr = va_arg(ap, int *); |
| *ptr = (int)formatter.str_off; |
| va_labels++; |
| dfsan_set_label(0, ptr, sizeof(ptr)); |
| end_fmt = true; |
| break; |
| } |
| |
| case '%': |
| retval = formatter.format(); |
| dfsan_set_label(0, formatter.str_cur(), |
| formatter.num_written_bytes(retval)); |
| end_fmt = true; |
| break; |
| |
| case '*': |
| formatter.width = va_arg(ap, int); |
| va_labels++; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| } |
| |
| if (retval < 0) { |
| return retval; |
| } |
| |
| formatter.fmt_cur++; |
| formatter.str_off += retval; |
| } |
| |
| *ret_label = 0; |
| |
| // Number of bytes written in total. |
| return formatter.str_off; |
| } |
| |
| extern "C" { |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __dfsw_sprintf(char *str, const char *format, dfsan_label str_label, |
| dfsan_label format_label, dfsan_label *va_labels, |
| dfsan_label *ret_label, ...) { |
| va_list ap; |
| va_start(ap, ret_label); |
| int ret = format_buffer(str, ~0ul, format, va_labels, ret_label, ap); |
| va_end(ap); |
| return ret; |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __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, ...) { |
| va_list ap; |
| va_start(ap, ret_label); |
| int ret = format_buffer(str, size, format, va_labels, ret_label, ap); |
| va_end(ap); |
| return ret; |
| } |
| |
| // Default empty implementations (weak). Users should redefine them. |
| SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_pc_guard, u32 *) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_pc_guard_init, u32 *, |
| u32 *) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_pcs_init, void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_pc_indir, void) {} |
| |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_cmp, void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_cmp1, void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_cmp2, void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_cmp4, void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_cmp8, void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_const_cmp1, |
| void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_const_cmp2, |
| void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_const_cmp4, |
| void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_const_cmp8, |
| void) {} |
| SANITIZER_INTERFACE_WEAK_DEF(void, __dfsw___sanitizer_cov_trace_switch, void) {} |
| } // extern "C" |
