aboutsummaryrefslogtreecommitdiffstats
path: root/lib/dfsan/dfsan_custom.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/dfsan/dfsan_custom.cpp')
-rw-r--r--lib/dfsan/dfsan_custom.cpp1156
1 files changed, 1156 insertions, 0 deletions
diff --git a/lib/dfsan/dfsan_custom.cpp b/lib/dfsan/dfsan_custom.cpp
new file mode 100644
index 000000000000..84f0271b15e0
--- /dev/null
+++ b/lib/dfsan/dfsan_custom.cpp
@@ -0,0 +1,1156 @@
+//===-- dfsan.cpp ---------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// 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); // NOLINT
+ 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"