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380 lines
13 KiB
380 lines
13 KiB
/*
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* Copyright 2006, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "crasher"
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pthread.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 <sys/mman.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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// We test both kinds of logging.
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#include <android-base/logging.h>
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#include <log/log.h>
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#include "seccomp_policy.h"
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#if defined(STATIC_CRASHER)
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#include "debuggerd/handler.h"
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#endif
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#if defined(__arm__)
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// See https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt for details.
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#define __kuser_helper_version (*(int32_t*) 0xffff0ffc)
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typedef void * (__kuser_get_tls_t)(void);
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#define __kuser_get_tls (*(__kuser_get_tls_t*) 0xffff0fe0)
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typedef int (__kuser_cmpxchg_t)(int oldval, int newval, volatile int *ptr);
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#define __kuser_cmpxchg (*(__kuser_cmpxchg_t*) 0xffff0fc0)
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typedef void (__kuser_dmb_t)(void);
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#define __kuser_dmb (*(__kuser_dmb_t*) 0xffff0fa0)
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typedef int (__kuser_cmpxchg64_t)(const int64_t*, const int64_t*, volatile int64_t*);
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#define __kuser_cmpxchg64 (*(__kuser_cmpxchg64_t*) 0xffff0f60)
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#endif
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#define noinline __attribute__((__noinline__))
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// Avoid name mangling so that stacks are more readable.
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extern "C" {
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void crash1(void);
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void crashnostack(void);
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int do_action(const char* arg);
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noinline void maybe_abort() {
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if (time(0) != 42) {
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abort();
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}
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}
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char* smash_stack_dummy_buf;
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noinline void smash_stack_dummy_function(volatile int* plen) {
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smash_stack_dummy_buf[*plen] = 0;
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}
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// This must be marked with "__attribute__ ((noinline))", to ensure the
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// compiler generates the proper stack guards around this function.
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// Assign local array address to global variable to force stack guards.
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// Use another noinline function to corrupt the stack.
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noinline int smash_stack(volatile int* plen) {
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printf("%s: deliberately corrupting stack...\n", getprogname());
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char buf[128];
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smash_stack_dummy_buf = buf;
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// This should corrupt stack guards and make process abort.
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smash_stack_dummy_function(plen);
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return 0;
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}
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Winfinite-recursion"
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void* global = 0; // So GCC doesn't optimize the tail recursion out of overflow_stack.
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noinline void overflow_stack(void* p) {
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void* buf[1];
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buf[0] = p;
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global = buf;
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overflow_stack(&buf);
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}
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#pragma clang diagnostic pop
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noinline void* thread_callback(void* raw_arg) {
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const char* arg = reinterpret_cast<const char*>(raw_arg);
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return reinterpret_cast<void*>(static_cast<uintptr_t>(do_action(arg)));
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}
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noinline int do_action_on_thread(const char* arg) {
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pthread_t t;
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pthread_create(&t, nullptr, thread_callback, const_cast<char*>(arg));
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void* result = nullptr;
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pthread_join(t, &result);
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return reinterpret_cast<uintptr_t>(result);
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}
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noinline int crash_null() {
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int (*null_func)() = nullptr;
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return null_func();
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}
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noinline int crash3(int a) {
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*reinterpret_cast<int*>(0xdead) = a;
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return a*4;
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}
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noinline int crash2(int a) {
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a = crash3(a) + 2;
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return a*3;
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}
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noinline int crash(int a) {
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a = crash2(a) + 1;
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return a*2;
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}
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wfree-nonheap-object"
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noinline void abuse_heap() {
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char buf[16];
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free(buf); // GCC is smart enough to warn about this, but we're doing it deliberately.
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}
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#pragma clang diagnostic pop
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noinline void leak() {
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while (true) {
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void* mapping =
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mmap(nullptr, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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static_cast<volatile char*>(mapping)[0] = 'a';
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}
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}
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noinline void sigsegv_non_null() {
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int* a = (int *)(&do_action);
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*a = 42;
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}
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noinline void fprintf_null() {
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fprintf(nullptr, "oops");
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}
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noinline void readdir_null() {
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readdir(nullptr);
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}
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noinline int strlen_null() {
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char* sneaky_null = nullptr;
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return strlen(sneaky_null);
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}
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static int usage() {
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fprintf(stderr, "usage: %s KIND\n", getprogname());
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fprintf(stderr, "\n");
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fprintf(stderr, "where KIND is:\n");
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fprintf(stderr, " smash-stack overwrite a -fstack-protector guard\n");
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fprintf(stderr, " stack-overflow recurse until the stack overflows\n");
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fprintf(stderr, " nostack crash with a NULL stack pointer\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " heap-usage cause a libc abort by abusing a heap function\n");
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fprintf(stderr, " call-null cause a crash by calling through a nullptr\n");
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fprintf(stderr, " leak leak memory until we get OOM-killed\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " abort call abort()\n");
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fprintf(stderr, " assert call assert() without a function\n");
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fprintf(stderr, " assert2 call assert() with a function\n");
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fprintf(stderr, " exit call exit(1)\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " fortify fail a _FORTIFY_SOURCE check\n");
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fprintf(stderr, " fdsan_file close a file descriptor that's owned by a FILE*\n");
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fprintf(stderr, " fdsan_dir close a file descriptor that's owned by a DIR*\n");
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fprintf(stderr, " seccomp fail a seccomp check\n");
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#if defined(__arm__)
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fprintf(stderr, " kuser_helper_version call kuser_helper_version\n");
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fprintf(stderr, " kuser_get_tls call kuser_get_tls\n");
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fprintf(stderr, " kuser_cmpxchg call kuser_cmpxchg\n");
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fprintf(stderr, " kuser_memory_barrier call kuser_memory_barrier\n");
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fprintf(stderr, " kuser_cmpxchg64 call kuser_cmpxchg64\n");
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#endif
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fprintf(stderr, " xom read execute-only memory\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " LOG_ALWAYS_FATAL call liblog LOG_ALWAYS_FATAL\n");
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fprintf(stderr, " LOG_ALWAYS_FATAL_IF call liblog LOG_ALWAYS_FATAL_IF\n");
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fprintf(stderr, " LOG-FATAL call libbase LOG(FATAL)\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " SIGFPE cause a SIGFPE\n");
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fprintf(stderr, " SIGILL cause a SIGILL\n");
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fprintf(stderr, " SIGSEGV cause a SIGSEGV at address 0x0 (synonym: crash)\n");
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fprintf(stderr, " SIGSEGV-non-null cause a SIGSEGV at a non-zero address\n");
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fprintf(stderr, " SIGSEGV-unmapped mmap/munmap a region of memory and then attempt to access it\n");
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fprintf(stderr, " SIGTRAP cause a SIGTRAP\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " fprintf-NULL pass a null pointer to fprintf\n");
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fprintf(stderr, " readdir-NULL pass a null pointer to readdir\n");
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fprintf(stderr, " strlen-NULL pass a null pointer to strlen\n");
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fprintf(stderr, " pthread_join-NULL pass a null pointer to pthread_join\n");
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fprintf(stderr, "\n");
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fprintf(stderr, " no_new_privs set PR_SET_NO_NEW_PRIVS and then abort\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "prefix any of the above with 'thread-' to run on a new thread\n");
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fprintf(stderr, "prefix any of the above with 'exhaustfd-' to exhaust\n");
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fprintf(stderr, "all available file descriptors before crashing.\n");
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fprintf(stderr, "prefix any of the above with 'wait-' to wait until input is received on stdin\n");
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return EXIT_FAILURE;
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}
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noinline int do_action(const char* arg) {
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// Prefixes.
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if (!strncmp(arg, "wait-", strlen("wait-"))) {
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char buf[1];
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UNUSED(TEMP_FAILURE_RETRY(read(STDIN_FILENO, buf, sizeof(buf))));
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return do_action(arg + strlen("wait-"));
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} else if (!strncmp(arg, "exhaustfd-", strlen("exhaustfd-"))) {
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errno = 0;
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while (errno != EMFILE) {
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open("/dev/null", O_RDONLY);
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}
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return do_action(arg + strlen("exhaustfd-"));
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} else if (!strncmp(arg, "thread-", strlen("thread-"))) {
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return do_action_on_thread(arg + strlen("thread-"));
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}
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// Actions.
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if (!strcasecmp(arg, "SIGSEGV-non-null")) {
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sigsegv_non_null();
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} else if (!strcasecmp(arg, "smash-stack")) {
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volatile int len = 128;
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return smash_stack(&len);
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} else if (!strcasecmp(arg, "stack-overflow")) {
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overflow_stack(nullptr);
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} else if (!strcasecmp(arg, "nostack")) {
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crashnostack();
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} else if (!strcasecmp(arg, "exit")) {
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exit(1);
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} else if (!strcasecmp(arg, "call-null")) {
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return crash_null();
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} else if (!strcasecmp(arg, "crash") || !strcmp(arg, "SIGSEGV")) {
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return crash(42);
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} else if (!strcasecmp(arg, "abort")) {
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maybe_abort();
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} else if (!strcasecmp(arg, "assert")) {
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__assert("some_file.c", 123, "false");
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} else if (!strcasecmp(arg, "assert2")) {
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__assert2("some_file.c", 123, "some_function", "false");
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#if !defined(__clang_analyzer__)
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} else if (!strcasecmp(arg, "fortify")) {
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// FORTIFY is disabled when running clang-tidy and other tools, so this
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// shouldn't depend on internal implementation details of it.
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char buf[10];
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__read_chk(-1, buf, 32, 10);
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while (true) pause();
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#endif
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} else if (!strcasecmp(arg, "fdsan_file")) {
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FILE* f = fopen("/dev/null", "r");
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close(fileno(f));
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} else if (!strcasecmp(arg, "fdsan_dir")) {
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DIR* d = opendir("/dev/");
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close(dirfd(d));
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} else if (!strcasecmp(arg, "LOG(FATAL)")) {
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LOG(FATAL) << "hello " << 123;
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} else if (!strcasecmp(arg, "LOG_ALWAYS_FATAL")) {
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LOG_ALWAYS_FATAL("hello %s", "world");
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} else if (!strcasecmp(arg, "LOG_ALWAYS_FATAL_IF")) {
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LOG_ALWAYS_FATAL_IF(true, "hello %s", "world");
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} else if (!strcasecmp(arg, "SIGFPE")) {
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raise(SIGFPE);
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return EXIT_SUCCESS;
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} else if (!strcasecmp(arg, "SIGILL")) {
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#if defined(__aarch64__)
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__asm__ volatile(".word 0\n");
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#elif defined(__arm__)
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__asm__ volatile(".word 0xe7f0def0\n");
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#elif defined(__i386__) || defined(__x86_64__)
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__asm__ volatile("ud2\n");
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#else
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#error
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#endif
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} else if (!strcasecmp(arg, "SIGTRAP")) {
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raise(SIGTRAP);
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return EXIT_SUCCESS;
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} else if (!strcasecmp(arg, "fprintf-NULL")) {
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fprintf_null();
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} else if (!strcasecmp(arg, "readdir-NULL")) {
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readdir_null();
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} else if (!strcasecmp(arg, "strlen-NULL")) {
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return strlen_null();
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} else if (!strcasecmp(arg, "pthread_join-NULL")) {
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return pthread_join(0, nullptr);
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} else if (!strcasecmp(arg, "heap-usage")) {
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abuse_heap();
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} else if (!strcasecmp(arg, "leak")) {
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leak();
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} else if (!strcasecmp(arg, "SIGSEGV-unmapped")) {
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char* map = reinterpret_cast<char*>(
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mmap(nullptr, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0));
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munmap(map, sizeof(int));
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map[0] = '8';
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} else if (!strcasecmp(arg, "seccomp")) {
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set_system_seccomp_filter();
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syscall(99999);
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#if defined(__LP64__)
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} else if (!strcasecmp(arg, "xom")) {
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// Try to read part of our code, which will fail if XOM is active.
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printf("*%lx = %lx\n", reinterpret_cast<long>(usage), *reinterpret_cast<long*>(usage));
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#endif
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#if defined(__arm__)
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} else if (!strcasecmp(arg, "kuser_helper_version")) {
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return __kuser_helper_version;
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} else if (!strcasecmp(arg, "kuser_get_tls")) {
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return !__kuser_get_tls();
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} else if (!strcasecmp(arg, "kuser_cmpxchg")) {
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return __kuser_cmpxchg(0, 0, 0);
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} else if (!strcasecmp(arg, "kuser_memory_barrier")) {
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__kuser_dmb();
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} else if (!strcasecmp(arg, "kuser_cmpxchg64")) {
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return __kuser_cmpxchg64(0, 0, 0);
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#endif
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} else if (!strcasecmp(arg, "no_new_privs")) {
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if (prctl(PR_SET_NO_NEW_PRIVS, 1) != 0) {
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fprintf(stderr, "prctl(PR_SET_NO_NEW_PRIVS, 1) failed: %s\n", strerror(errno));
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return EXIT_SUCCESS;
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}
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abort();
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} else {
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return usage();
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}
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fprintf(stderr, "%s: exiting normally!\n", getprogname());
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return EXIT_SUCCESS;
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}
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int main(int argc, char** argv) {
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#if defined(STATIC_CRASHER)
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debuggerd_callbacks_t callbacks = {
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.get_process_info = []() {
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static struct {
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size_t size;
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char msg[32];
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} msg;
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msg.size = strlen("dummy abort message");
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memcpy(msg.msg, "dummy abort message", strlen("dummy abort message"));
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return debugger_process_info{
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.abort_msg = reinterpret_cast<void*>(&msg),
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};
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},
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.post_dump = nullptr
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};
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debuggerd_init(&callbacks);
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#endif
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if (argc == 1) crash1();
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else if (argc == 2) return do_action(argv[1]);
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return usage();
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}
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};
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