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authorDimitry Andric <dim@FreeBSD.org>2014-11-06 22:49:13 +0000
committerDimitry Andric <dim@FreeBSD.org>2014-11-06 22:49:13 +0000
commit8ef50bf3d1c287b5013c3168de77a462dfce3495 (patch)
tree3467f3372c1195b1546172d89af2205a50b1866d /lib/dfsan/dfsan_custom.cc
parent11023dc647fd8f41418da90d59db138400d0f334 (diff)
downloadsrc-8ef50bf3d1c287b5013c3168de77a462dfce3495.tar.gz
src-8ef50bf3d1c287b5013c3168de77a462dfce3495.zip
Import compiler-rt release_34 branch r197381.vendor/compiler-rt/compiler-rt-r197381
Notes
Notes: svn path=/vendor/compiler-rt/dist/; revision=274201 svn path=/vendor/compiler-rt/compiler-rt-r197381/; revision=274202; tag=vendor/compiler-rt/compiler-rt-r197381
Diffstat (limited to 'lib/dfsan/dfsan_custom.cc')
-rw-r--r--lib/dfsan/dfsan_custom.cc341
1 files changed, 341 insertions, 0 deletions
diff --git a/lib/dfsan/dfsan_custom.cc b/lib/dfsan/dfsan_custom.cc
new file mode 100644
index 000000000000..6a132db062b3
--- /dev/null
+++ b/lib/dfsan/dfsan_custom.cc
@@ -0,0 +1,341 @@
+//===-- 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_internal_defs.h"
+#include "sanitizer_common/sanitizer_linux.h"
+
+#include "dfsan/dfsan.h"
+
+#include <ctype.h>
+#include <dlfcn.h>
+#include <link.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.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) {
+ 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) {
+ *ret_label = dfsan_union(dfsan_read_label(s, i+1), c_label);
+ return s[i] == 0 ? 0 : const_cast<char *>(s+i);
+ }
+ }
+}
+
+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) {
+ 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));
+ return cs1[i] - cs2[i];
+ }
+ }
+ *ret_label = dfsan_union(dfsan_read_label(cs1, n),
+ dfsan_read_label(cs2, n));
+ return 0;
+}
+
+SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_strcmp(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 (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));
+ 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) {
+ *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_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;
+ }
+
+ 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));
+ 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) {
+ *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);
+ *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));
+ 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 = 0;
+ 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 = 0;
+ 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 = 0;
+ 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) {
+ link_map *map = (link_map *)dlopen(filename, flag);
+ if (map)
+ ForEachMappedRegion(map, unpoison);
+ *ret_label = 0;
+ return (void *)map;
+}
+
+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, (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_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);
+}
+
+}