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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bionic_ssp.h"
#include "logd.h"
void* __stack_chk_guard = NULL;
static void __attribute__((constructor)) __init_stack_check_guard() {
__stack_chk_guard = __generate_stack_chk_guard();
}
// This is the crash handler.
// Does a best effort at logging and calls _exit to terminate
// the process immediately (without atexit handlers, etc.).
void __stack_chk_fail() {
// Immediately block all (but SIGABRT) signal handlers from running code.
sigset_t sigmask;
sigfillset(&sigmask);
sigdelset(&sigmask, SIGABRT);
sigprocmask(SIG_BLOCK, &sigmask, NULL);
// Use /proc/self/exe link to obtain the program name for logging
// purposes. If it's not available, we set it to "<unknown>".
char path[PATH_MAX];
int count;
if ((count = readlink("/proc/self/exe", path, sizeof(path) - 1)) == -1) {
strlcpy(path, "<unknown>", sizeof(path));
} else {
path[count] = '\0';
}
// Do a best effort at logging. This ends up calling writev(2).
__libc_android_log_print(ANDROID_LOG_FATAL, path, "stack corruption detected: aborted");
// Make sure there is no default action for SIGABRT.
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = SIG_DFL;
sigaction(SIGABRT, &sa, NULL);
// Terminate the process and exit immediately.
kill(getpid(), SIGABRT);
_exit(127);
}
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