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authorDimitry Andric <dim@FreeBSD.org>2015-01-07 19:55:37 +0000
committerDimitry Andric <dim@FreeBSD.org>2015-01-07 19:55:37 +0000
commitca9211ecdede9bdedb812b2243a4abdb8dacd1b9 (patch)
tree9b19e801150082c33e9152275829a6ce90614b55 /lib/dfsan/dfsan_custom.cc
parent8ef50bf3d1c287b5013c3168de77a462dfce3495 (diff)
downloadsrc-ca9211ecdede9bdedb812b2243a4abdb8dacd1b9.tar.gz
src-ca9211ecdede9bdedb812b2243a4abdb8dacd1b9.zip
Import compiler-rt trunk r224034.vendor/compiler-rt/compiler-rt-r224034
Notes
Notes: svn path=/vendor/compiler-rt/dist/; revision=276789 svn path=/vendor/compiler-rt/compiler-rt-r224034/; revision=276790; tag=vendor/compiler-rt/compiler-rt-r224034
Diffstat (limited to 'lib/dfsan/dfsan_custom.cc')
-rw-r--r--lib/dfsan/dfsan_custom.cc833
1 files changed, 808 insertions, 25 deletions
diff --git a/lib/dfsan/dfsan_custom.cc b/lib/dfsan/dfsan_custom.cc
index 6a132db062b3..839a399faae0 100644
--- a/lib/dfsan/dfsan_custom.cc
+++ b/lib/dfsan/dfsan_custom.cc
@@ -11,26 +11,39 @@
//
// 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/types.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;
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) {
@@ -58,7 +71,12 @@ SANITIZER_INTERFACE_ATTRIBUTE char *__dfsw_strchr(const char *s, int c,
dfsan_label *ret_label) {
for (size_t i = 0;; ++i) {
if (s[i] == c || s[i] == 0) {
- *ret_label = dfsan_union(dfsan_read_label(s, i+1), c_label);
+ 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 ? 0 : const_cast<char *>(s+i);
}
}
@@ -72,13 +90,22 @@ SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_memcmp(const void *s1, const void *s2,
const char *cs1 = (const char *) s1, *cs2 = (const char *) s2;
for (size_t i = 0; i != n; ++i) {
if (cs1[i] != cs2[i]) {
- *ret_label = dfsan_union(dfsan_read_label(cs1, i+1),
- dfsan_read_label(cs2, i+1));
+ 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];
}
}
- *ret_label = dfsan_union(dfsan_read_label(cs1, n),
- dfsan_read_label(cs2, n));
+
+ 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;
}
@@ -88,8 +115,12 @@ SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strcmp(const char *s1, const char *s2,
dfsan_label *ret_label) {
for (size_t i = 0;; ++i) {
if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0) {
- *ret_label = dfsan_union(dfsan_read_label(s1, i+1),
- dfsan_read_label(s2, i+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];
}
}
@@ -101,8 +132,12 @@ __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) {
- *ret_label = dfsan_union(dfsan_read_label(s1, i+1),
- dfsan_read_label(s2, i+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];
}
}
@@ -120,9 +155,13 @@ SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strncmp(const char *s1, const char *s2,
}
for (size_t i = 0;; ++i) {
- if (s1[i] != s2[i] || s1[i] == 0 || s2[i] == 0 || i == n-1) {
- *ret_label = dfsan_union(dfsan_read_label(s1, i+1),
- dfsan_read_label(s2, i+1));
+ 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];
}
}
@@ -141,8 +180,12 @@ __dfsw_strncasecmp(const char *s1, const char *s2, size_t n,
for (size_t i = 0;; ++i) {
if (tolower(s1[i]) != tolower(s2[i]) || s1[i] == 0 || s2[i] == 0 ||
i == n - 1) {
- *ret_label = dfsan_union(dfsan_read_label(s1, i+1),
- dfsan_read_label(s2, i+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];
}
}
@@ -162,14 +205,19 @@ SANITIZER_INTERFACE_ATTRIBUTE void *__dfsw_calloc(size_t nmemb, size_t size,
SANITIZER_INTERFACE_ATTRIBUTE size_t
__dfsw_strlen(const char *s, dfsan_label s_label, dfsan_label *ret_label) {
size_t ret = strlen(s);
- *ret_label = dfsan_read_label(s, ret+1);
+ 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), *ssrc = shadow_for((void *)src);
- internal_memcpy((void *)sdest, (void *)ssrc, n * sizeof(dfsan_label));
+ 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);
}
@@ -182,7 +230,7 @@ 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 = 0;
+ *ret_label = dest_label;
return dfsan_memcpy(dest, src, n);
}
@@ -191,7 +239,7 @@ 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 = 0;
+ *ret_label = s_label;
return s;
}
@@ -216,7 +264,7 @@ __dfsw_strncpy(char *s1, const char *s2, size_t n, dfsan_label s1_label,
dfsan_memcpy(s1, s2, n);
}
- *ret_label = 0;
+ *ret_label = s1_label;
return s1;
}
@@ -318,9 +366,11 @@ struct dl_iterate_phdr_info {
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, (void *)info->dlpi_name, strlen(info->dlpi_name) + 1);
- dfsan_set_label(0, (void *)info->dlpi_phdr,
- sizeof(*info->dlpi_phdr) * info->dlpi_phnum);
+ 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);
@@ -338,4 +388,737 @@ SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_dl_iterate_phdr(
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 = NULL;
+ void *write_callback = NULL;
+} 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 != NULL) {
+ 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);
+}
+
+// Type used to extract a dfsan_label with va_arg()
+typedef int dfsan_label_va;
+
+// A chunk of data representing the output of formatting either a constant
+// string or a single format directive.
+struct Chunk {
+ // Address of the beginning of the formatted string
+ const char *ptr;
+ // Size of the formatted string
+ size_t size;
+
+ // Type of DFSan label (depends on the format directive)
+ enum {
+ // Constant string, no argument and thus no label
+ NONE = 0,
+ // Label for an argument of '%n'
+ IGNORED,
+ // Label for a '%s' argument
+ STRING,
+ // Label for any other type of argument
+ NUMERIC,
+ } label_type;
+
+ // Value of the argument (if label_type == STRING)
+ const char *arg;
+};
+
+// Formats the input. The output is stored in 'str' starting from offset
+// 'off'. The format directive is represented by the first 'format_size' bytes
+// of 'format'. If 'has_size' is true, 'size' bounds the number of output
+// bytes. Returns the return value of the vsnprintf call used to format the
+// input.
+static int format_chunk(char *str, size_t off, bool has_size, size_t size,
+ const char *format, size_t format_size, ...) {
+ char *chunk_format = (char *) malloc(format_size + 1);
+ assert(chunk_format);
+ internal_memcpy(chunk_format, format, format_size);
+ chunk_format[format_size] = '\0';
+
+ va_list ap;
+ va_start(ap, format_size);
+ int r = 0;
+ if (has_size) {
+ r = vsnprintf(str + off, off < size ? size - off : 0, chunk_format, ap);
+ } else {
+ r = vsprintf(str + off, chunk_format, ap);
+ }
+ va_end(ap);
+
+ free(chunk_format);
+ return r;
+}
+
+// Formats the input and propagates the input labels to the output. The output
+// is stored in 'str'. If 'has_size' is true, '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.
+static int format_buffer(char *str, bool has_size, size_t size,
+ const char *format, dfsan_label *va_labels,
+ dfsan_label *ret_label, va_list ap) {
+ InternalMmapVector<Chunk> chunks(8);
+ size_t off = 0;
+
+ while (*format) {
+ chunks.push_back(Chunk());
+ Chunk& chunk = chunks.back();
+ chunk.ptr = str + off;
+ chunk.arg = nullptr;
+
+ int status = 0;
+
+ if (*format != '%') {
+ // Ordinary character. Consume all the characters until a '%' or the end
+ // of the string.
+ size_t format_size = 0;
+ for (; *format && *format != '%'; ++format, ++format_size) {}
+ status = format_chunk(str, off, has_size, size, format - format_size,
+ format_size);
+ chunk.label_type = Chunk::NONE;
+ } else {
+ // Conversion directive. Consume all the characters until a conversion
+ // specifier or the end of the string.
+ bool end_format = false;
+#define FORMAT_CHUNK(t) \
+ format_chunk(str, off, has_size, size, format - format_size, \
+ format_size + 1, va_arg(ap, t))
+
+ for (size_t format_size = 1; *++format && !end_format; ++format_size) {
+ switch (*format) {
+ case 'd':
+ case 'i':
+ case 'o':
+ case 'u':
+ case 'x':
+ case 'X':
+ switch (*(format - 1)) {
+ case 'h':
+ // Also covers the 'hh' case (since the size of the arg is still
+ // an int).
+ status = FORMAT_CHUNK(int);
+ break;
+ case 'l':
+ if (format_size >= 2 && *(format - 2) == 'l') {
+ status = FORMAT_CHUNK(long long int);
+ } else {
+ status = FORMAT_CHUNK(long int);
+ }
+ break;
+ case 'q':
+ status = FORMAT_CHUNK(long long int);
+ break;
+ case 'j':
+ status = FORMAT_CHUNK(intmax_t);
+ break;
+ case 'z':
+ status = FORMAT_CHUNK(size_t);
+ break;
+ case 't':
+ status = FORMAT_CHUNK(size_t);
+ break;
+ default:
+ status = FORMAT_CHUNK(int);
+ }
+ chunk.label_type = Chunk::NUMERIC;
+ end_format = true;
+ break;
+
+ case 'a':
+ case 'A':
+ case 'e':
+ case 'E':
+ case 'f':
+ case 'F':
+ case 'g':
+ case 'G':
+ if (*(format - 1) == 'L') {
+ status = FORMAT_CHUNK(long double);
+ } else {
+ status = FORMAT_CHUNK(double);
+ }
+ chunk.label_type = Chunk::NUMERIC;
+ end_format = true;
+ break;
+
+ case 'c':
+ status = FORMAT_CHUNK(int);
+ chunk.label_type = Chunk::NUMERIC;
+ end_format = true;
+ break;
+
+ case 's':
+ chunk.arg = va_arg(ap, char *);
+ status =
+ format_chunk(str, off, has_size, size,
+ format - format_size, format_size + 1,
+ chunk.arg);
+ chunk.label_type = Chunk::STRING;
+ end_format = true;
+ break;
+
+ case 'p':
+ status = FORMAT_CHUNK(void *);
+ chunk.label_type = Chunk::NUMERIC;
+ end_format = true;
+ break;
+
+ case 'n':
+ *(va_arg(ap, int *)) = (int)off;
+ chunk.label_type = Chunk::IGNORED;
+ end_format = true;
+ break;
+
+ case '%':
+ status = format_chunk(str, off, has_size, size,
+ format - format_size, format_size + 1);
+ chunk.label_type = Chunk::NONE;
+ end_format = true;
+ break;
+
+ default:
+ break;
+ }
+ }
+#undef FORMAT_CHUNK
+ }
+
+ if (status < 0) {
+ return status;
+ }
+
+ // A return value of {v,}snprintf of size or more means that the output was
+ // truncated.
+ if (has_size) {
+ if (off < size) {
+ size_t ustatus = (size_t) status;
+ chunk.size = ustatus >= (size - off) ?
+ ustatus - (size - off) : ustatus;
+ } else {
+ chunk.size = 0;
+ }
+ } else {
+ chunk.size = status;
+ }
+ off += status;
+ }
+
+ // TODO(martignlo): Decide how to combine labels (e.g., whether to ignore or
+ // not the label of the format string).
+
+ // Label each output chunk according to the label supplied as argument to the
+ // function. We need to go through all the chunks and arguments even if the
+ // string was only partially printed ({v,}snprintf case).
+ for (size_t i = 0; i < chunks.size(); ++i) {
+ const Chunk& chunk = chunks[i];
+ void *chunk_ptr = const_cast<char *>(chunk.ptr);
+
+ switch (chunk.label_type) {
+ case Chunk::NONE:
+ dfsan_set_label(0, chunk_ptr, chunk.size);
+ break;
+ case Chunk::IGNORED:
+ va_labels++;
+ dfsan_set_label(0, chunk_ptr, chunk.size);
+ break;
+ case Chunk::NUMERIC: {
+ dfsan_label label = *va_labels++;
+ dfsan_set_label(label, chunk_ptr, chunk.size);
+ break;
+ }
+ case Chunk::STRING: {
+ // Consume the label of the pointer to the string
+ va_labels++;
+ internal_memcpy(shadow_for(chunk_ptr),
+ shadow_for(chunk.arg),
+ sizeof(dfsan_label) * (strlen(chunk.arg)));
+ break;
+ }
+ }
+ }
+
+ *ret_label = 0;
+
+ // Number of bytes written in total.
+ return off;
+}
+
+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, false, 0, 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, true, size, format, va_labels, ret_label, ap);
+ va_end(ap);
+ return ret;
+}
}