699237baf5
... for the consistency sake. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
/*
|
|
* 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <ctype.h>
|
|
#include "logd.h"
|
|
|
|
void *__stack_chk_guard = 0;
|
|
|
|
/* Initialize the canary with a random value from /dev/urandom.
|
|
* If that fails, use the "terminator canary". */
|
|
static void __attribute__ ((constructor))
|
|
__guard_setup(void)
|
|
{
|
|
int fd;
|
|
|
|
fd = open("/dev/urandom", O_RDONLY);
|
|
if (fd != -1) {
|
|
ssize_t len = read(fd, &__stack_chk_guard,
|
|
sizeof(__stack_chk_guard));
|
|
close(fd);
|
|
if (len == sizeof(__stack_chk_guard))
|
|
return;
|
|
}
|
|
|
|
/* If that failed, switch to 'terminator canary' */
|
|
((unsigned char *)&__stack_chk_guard)[0] = 0;
|
|
((unsigned char *)&__stack_chk_guard)[1] = 0;
|
|
((unsigned char *)&__stack_chk_guard)[2] = '\n';
|
|
((unsigned char *)&__stack_chk_guard)[3] = 255;
|
|
}
|
|
|
|
/* 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(void)
|
|
{
|
|
struct sigaction sa;
|
|
sigset_t sigmask;
|
|
static const char message[] = "stack corruption detected: aborted";
|
|
char path[PATH_MAX];
|
|
int count;
|
|
|
|
/* Immediately block all (but SIGABRT) signal handlers from running code */
|
|
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>" */
|
|
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, message);
|
|
|
|
/* Make sure there is no default action for SIGABRT */
|
|
bzero(&sa, sizeof(struct sigaction));
|
|
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);
|
|
}
|