100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include "logd.h"
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void *__stack_chk_guard = 0;
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/* Initialize the canary with a random value from /dev/urandom.
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* If that fails, use the "terminator canary". */
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static void __attribute__ ((constructor))
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__guard_setup(void)
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{
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int fd;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd != -1) {
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ssize_t len = read(fd, &__stack_chk_guard,
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sizeof(__stack_chk_guard));
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close(fd);
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if (len == sizeof(__stack_chk_guard))
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return;
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}
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/* If that failed, switch to 'terminator canary' */
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((unsigned char *)&__stack_chk_guard)[0] = 0;
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((unsigned char *)&__stack_chk_guard)[1] = 0;
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((unsigned char *)&__stack_chk_guard)[2] = '\n';
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((unsigned char *)&__stack_chk_guard)[3] = 255;
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}
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/* This is the crash handler.
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* Does a best effort at logging and calls _exit to terminate
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* the process immediately (without atexit handlers, etc.) */
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void __stack_chk_fail(void)
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{
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struct sigaction sa;
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sigset_t sigmask;
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static const char message[] = "stack corruption detected: aborted";
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char path[PATH_MAX];
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int count;
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/* Immediately block all (but SIGABRT) signal handlers from running code */
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sigfillset(&sigmask);
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sigdelset(&sigmask, SIGABRT);
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sigprocmask(SIG_BLOCK, &sigmask, NULL);
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/* Use /proc/self/exe link to obtain the program name for logging
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* purposes. If it's not available, we set it to "unknown" */
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if ((count = readlink("/proc/self/exe", path, sizeof(path) - 1)) == -1) {
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strlcpy(path, "unknown", sizeof(path));
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} else {
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path[count] = '\0';
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}
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/* Do a best effort at logging. This ends up calling writev(2) */
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__libc_android_log_print(ANDROID_LOG_FATAL, path, message);
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/* Make sure there is no default action for SIGABRT */
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bzero(&sa, sizeof(struct sigaction));
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_handler = SIG_DFL;
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sigaction(SIGABRT, &sa, NULL);
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/* Terminate the process and exit immediately */
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kill(getpid(), SIGABRT);
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_exit(127);
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}
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