ad88a08631
Based on a pair of patches from Intel: https://android-review.googlesource.com/#/c/43909/ https://android-review.googlesource.com/#/c/44903/ For x86, this patch supports _both_ the global that ARM/MIPS use and the per-thread TLS entry (%gs:20) that GCC uses by default. This lets us support binaries built with any x86 toolchain (right now, the NDK is emitting x86 code that uses the global). I've also extended the original tests to cover ARM/MIPS too, and be a little more thorough for x86. Change-Id: I02f279a80c6b626aecad449771dec91df235ad01
81 lines
2.8 KiB
C++
81 lines
2.8 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 <ctype.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "bionic_ssp.h"
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#include "logd.h"
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void* __stack_chk_guard = NULL;
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static void __attribute__((constructor)) __init_stack_check_guard() {
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__stack_chk_guard = __generate_stack_chk_guard();
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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() {
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// Immediately block all (but SIGABRT) signal handlers from running code.
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sigset_t sigmask;
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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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char path[PATH_MAX];
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int count;
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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, "stack corruption detected: aborted");
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// Make sure there is no default action for SIGABRT.
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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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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