summaryrefslogtreecommitdiff
path: root/sandbox/linux/services/libc_urandom_override.cc
diff options
context:
space:
mode:
Diffstat (limited to 'sandbox/linux/services/libc_urandom_override.cc')
-rw-r--r--sandbox/linux/services/libc_urandom_override.cc236
1 files changed, 0 insertions, 236 deletions
diff --git a/sandbox/linux/services/libc_urandom_override.cc b/sandbox/linux/services/libc_urandom_override.cc
deleted file mode 100644
index 33bb25d6b1..0000000000
--- a/sandbox/linux/services/libc_urandom_override.cc
+++ /dev/null
@@ -1,236 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "sandbox/linux/services/libc_urandom_override.h"
-
-#include <dlfcn.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "base/logging.h"
-#include "base/posix/eintr_wrapper.h"
-#include "base/rand_util.h"
-
-// Note: this file is used by the zygote and nacl_helper.
-
-#if !defined(HAVE_XSTAT) && defined(LIBC_GLIBC)
-#define HAVE_XSTAT 1
-#endif
-
-namespace sandbox {
-
-static bool g_override_urandom = false;
-
-// TODO(sergeyu): Currently InitLibcUrandomOverrides() doesn't work properly
-// under ASan or MSan - it crashes content_unittests. Make sure it works
-// properly and enable it here. http://crbug.com/123263
-#if !(defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER))
-static void InitLibcFileIOFunctions();
-static pthread_once_t g_libc_file_io_funcs_guard = PTHREAD_ONCE_INIT;
-#endif
-
-void InitLibcUrandomOverrides() {
- // Make sure /dev/urandom is open.
- base::GetUrandomFD();
- g_override_urandom = true;
-
-#if !(defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER))
- CHECK_EQ(0, pthread_once(&g_libc_file_io_funcs_guard,
- InitLibcFileIOFunctions));
-#endif
-}
-
-#if !(defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER))
-
-static const char kUrandomDevPath[] = "/dev/urandom";
-
-typedef FILE* (*FopenFunction)(const char* path, const char* mode);
-
-static FopenFunction g_libc_fopen = NULL;
-static FopenFunction g_libc_fopen64 = NULL;
-
-#if HAVE_XSTAT
-typedef int (*XstatFunction)(int version, const char *path, struct stat *buf);
-typedef int (*Xstat64Function)(int version, const char *path,
- struct stat64 *buf);
-
-static XstatFunction g_libc_xstat = NULL;
-static Xstat64Function g_libc_xstat64 = NULL;
-#else
-typedef int (*StatFunction)(const char *path, struct stat *buf);
-typedef int (*Stat64Function)(const char *path, struct stat64 *buf);
-
-static StatFunction g_libc_stat = NULL;
-static Stat64Function g_libc_stat64 = NULL;
-#endif // HAVE_XSTAT
-
-// Find the libc's real fopen* and *stat* functions. This should only be
-// called once, and should be guarded by g_libc_file_io_funcs_guard.
-static void InitLibcFileIOFunctions() {
- g_libc_fopen = reinterpret_cast<FopenFunction>(
- dlsym(RTLD_NEXT, "fopen"));
- g_libc_fopen64 = reinterpret_cast<FopenFunction>(
- dlsym(RTLD_NEXT, "fopen64"));
-
- if (!g_libc_fopen) {
- LOG(FATAL) << "Failed to get fopen() from libc.";
- } else if (!g_libc_fopen64) {
-#if !defined(OS_OPENBSD) && !defined(OS_FREEBSD)
- LOG(WARNING) << "Failed to get fopen64() from libc. Using fopen() instead.";
-#endif // !defined(OS_OPENBSD) && !defined(OS_FREEBSD)
- g_libc_fopen64 = g_libc_fopen;
- }
-
-#if HAVE_XSTAT
- g_libc_xstat = reinterpret_cast<XstatFunction>(
- dlsym(RTLD_NEXT, "__xstat"));
- g_libc_xstat64 = reinterpret_cast<Xstat64Function>(
- dlsym(RTLD_NEXT, "__xstat64"));
-
- if (!g_libc_xstat) {
- LOG(FATAL) << "Failed to get __xstat() from libc.";
- }
- if (!g_libc_xstat64) {
- LOG(FATAL) << "Failed to get __xstat64() from libc.";
- }
-#else
- g_libc_stat = reinterpret_cast<StatFunction>(
- dlsym(RTLD_NEXT, "stat"));
- g_libc_stat64 = reinterpret_cast<Stat64Function>(
- dlsym(RTLD_NEXT, "stat64"));
-
- if (!g_libc_stat) {
- LOG(FATAL) << "Failed to get stat() from libc.";
- }
- if (!g_libc_stat64) {
- LOG(FATAL) << "Failed to get stat64() from libc.";
- }
-#endif // HAVE_XSTAT
-}
-
-// fopen() and fopen64() are intercepted here so that NSS can open
-// /dev/urandom to seed its random number generator. NSS is used by
-// remoting in the sendbox.
-
-// fopen() call may be redirected to fopen64() in stdio.h using
-// __REDIRECT(), which sets asm name for fopen() to "fopen64". This
-// means that we cannot override fopen() directly here. Instead the
-// the code below defines fopen_override() function with asm name
-// "fopen", so that all references to fopen() will resolve to this
-// function.
-__attribute__ ((__visibility__("default")))
-FILE* fopen_override(const char* path, const char* mode) __asm__ ("fopen");
-
-__attribute__ ((__visibility__("default")))
-FILE* fopen_override(const char* path, const char* mode) {
- if (g_override_urandom && strcmp(path, kUrandomDevPath) == 0) {
- int fd = HANDLE_EINTR(dup(base::GetUrandomFD()));
- if (fd < 0) {
- PLOG(ERROR) << "dup() failed.";
- return NULL;
- }
- return fdopen(fd, mode);
- } else {
- CHECK_EQ(0, pthread_once(&g_libc_file_io_funcs_guard,
- InitLibcFileIOFunctions));
- return g_libc_fopen(path, mode);
- }
-}
-
-__attribute__ ((__visibility__("default")))
-FILE* fopen64(const char* path, const char* mode) {
- if (g_override_urandom && strcmp(path, kUrandomDevPath) == 0) {
- int fd = HANDLE_EINTR(dup(base::GetUrandomFD()));
- if (fd < 0) {
- PLOG(ERROR) << "dup() failed.";
- return NULL;
- }
- return fdopen(fd, mode);
- } else {
- CHECK_EQ(0, pthread_once(&g_libc_file_io_funcs_guard,
- InitLibcFileIOFunctions));
- return g_libc_fopen64(path, mode);
- }
-}
-
-// The stat() family of functions are subject to the same problem as
-// fopen(), so we have to use the same trick to override them.
-
-#if HAVE_XSTAT
-
-__attribute__ ((__visibility__("default")))
-int xstat_override(int version,
- const char *path,
- struct stat *buf) __asm__ ("__xstat");
-
-__attribute__ ((__visibility__("default")))
-int xstat_override(int version, const char *path, struct stat *buf) {
- if (g_override_urandom && strcmp(path, kUrandomDevPath) == 0) {
- int result = __fxstat(version, base::GetUrandomFD(), buf);
- return result;
- } else {
- CHECK_EQ(0, pthread_once(&g_libc_file_io_funcs_guard,
- InitLibcFileIOFunctions));
- return g_libc_xstat(version, path, buf);
- }
-}
-
-__attribute__ ((__visibility__("default")))
-int xstat64_override(int version,
- const char *path,
- struct stat64 *buf) __asm__ ("__xstat64");
-
-__attribute__ ((__visibility__("default")))
-int xstat64_override(int version, const char *path, struct stat64 *buf) {
- if (g_override_urandom && strcmp(path, kUrandomDevPath) == 0) {
- int result = __fxstat64(version, base::GetUrandomFD(), buf);
- return result;
- } else {
- CHECK_EQ(0, pthread_once(&g_libc_file_io_funcs_guard,
- InitLibcFileIOFunctions));
- return g_libc_xstat64(version, path, buf);
- }
-}
-
-#else
-
-__attribute__ ((__visibility__("default")))
-int stat_override(const char *path,
- struct stat *buf) __asm__ ("stat");
-
-__attribute__ ((__visibility__("default")))
-int stat_override(const char *path, struct stat *buf) {
- if (g_override_urandom && strcmp(path, kUrandomDevPath) == 0) {
- int result = fstat(base::GetUrandomFD(), buf);
- return result;
- } else {
- CHECK_EQ(0, pthread_once(&g_libc_file_io_funcs_guard,
- InitLibcFileIOFunctions));
- return g_libc_stat(path, buf);
- }
-}
-
-__attribute__ ((__visibility__("default")))
-int stat64_override(const char *path,
- struct stat64 *buf) __asm__ ("stat64");
-
-__attribute__ ((__visibility__("default")))
-int stat64_override(const char *path, struct stat64 *buf) {
- if (g_override_urandom && strcmp(path, kUrandomDevPath) == 0) {
- int result = fstat64(base::GetUrandomFD(), buf);
- return result;
- } else {
- CHECK_EQ(0, pthread_once(&g_libc_file_io_funcs_guard,
- InitLibcFileIOFunctions));
- return g_libc_stat64(path, buf);
- }
-}
-
-#endif // HAVE_XSTAT
-
-#endif // !(defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER))
-
-} // namespace content
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-18 02:30:20 +0000