205 lines
6.3 KiB
C
205 lines
6.3 KiB
C
#include <assert.h>
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#include <errno.h>
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#include <pthread.h>
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#include <sched.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/cdefs.h>
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#include <sys/mman.h>
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#include <sys/ptrace.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <cutils/sockets.h>
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#include <log/log.h>
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#ifndef __unused
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#define __unused __attribute__((__unused__))
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#endif
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extern const char* __progname;
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void crash1(void);
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void crashnostack(void);
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static int do_action(const char* arg);
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static 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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static int smash_stack(int i __unused) {
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printf("crasher: deliberately corrupting stack...\n");
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// Unless there's a "big enough" buffer on the stack, gcc
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// doesn't bother inserting checks.
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char buf[8];
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// If we don't write something relatively unpredictable
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// into the buffer and then do something with it, gcc
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// optimizes everything away and just returns a constant.
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*(int*)(&buf[7]) = (uintptr_t) &buf[0];
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return *(int*)(&buf[0]);
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}
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static void* global = 0; // So GCC doesn't optimize the tail recursion out of overflow_stack.
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__attribute__((noinline)) static 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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static void *noisy(void *x)
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{
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char c = (uintptr_t) x;
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for(;;) {
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usleep(250*1000);
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write(2, &c, 1);
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if(c == 'C') *((volatile unsigned*) 0) = 42;
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}
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return NULL;
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}
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static int ctest()
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{
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pthread_t thr;
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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pthread_create(&thr, &attr, noisy, (void*) 'A');
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pthread_create(&thr, &attr, noisy, (void*) 'B');
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pthread_create(&thr, &attr, noisy, (void*) 'C');
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for(;;) ;
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return 0;
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}
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static void* thread_callback(void* raw_arg)
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{
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return (void*) (uintptr_t) do_action((const char*) raw_arg);
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}
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static int do_action_on_thread(const char* arg)
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{
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pthread_t t;
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pthread_create(&t, NULL, thread_callback, (void*) arg);
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void* result = NULL;
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pthread_join(t, &result);
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return (int) (uintptr_t) result;
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}
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__attribute__((noinline)) static int crash3(int a) {
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*((int*) 0xdead) = a;
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return a*4;
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}
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__attribute__((noinline)) static 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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__attribute__((noinline)) static 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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static void abuse_heap() {
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char buf[16];
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free((void*) buf); // GCC is smart enough to warn about this, but we're doing it deliberately.
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}
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static 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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static int do_action(const char* arg)
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{
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fprintf(stderr,"crasher: init pid=%d tid=%d\n", getpid(), gettid());
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if (!strncmp(arg, "thread-", strlen("thread-"))) {
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return do_action_on_thread(arg + strlen("thread-"));
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} else if (!strcmp(arg, "SIGSEGV-non-null")) {
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sigsegv_non_null();
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} else if (!strcmp(arg, "smash-stack")) {
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return smash_stack(42);
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} else if (!strcmp(arg, "stack-overflow")) {
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overflow_stack(NULL);
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} else if (!strcmp(arg, "nostack")) {
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crashnostack();
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} else if (!strcmp(arg, "ctest")) {
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return ctest();
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} else if (!strcmp(arg, "exit")) {
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exit(1);
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} else if (!strcmp(arg, "crash") || !strcmp(arg, "SIGSEGV")) {
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return crash(42);
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} else if (!strcmp(arg, "abort")) {
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maybe_abort();
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} else if (!strcmp(arg, "assert")) {
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__assert("some_file.c", 123, "false");
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} else if (!strcmp(arg, "assert2")) {
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__assert2("some_file.c", 123, "some_function", "false");
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} else if (!strcmp(arg, "LOG_ALWAYS_FATAL")) {
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LOG_ALWAYS_FATAL("hello %s", "world");
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} else if (!strcmp(arg, "LOG_ALWAYS_FATAL_IF")) {
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LOG_ALWAYS_FATAL_IF(true, "hello %s", "world");
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} else if (!strcmp(arg, "SIGFPE")) {
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raise(SIGFPE);
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return EXIT_SUCCESS;
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} else if (!strcmp(arg, "SIGPIPE")) {
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int pipe_fds[2];
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pipe(pipe_fds);
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close(pipe_fds[0]);
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write(pipe_fds[1], "oops", 4);
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return EXIT_SUCCESS;
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} else if (!strcmp(arg, "SIGTRAP")) {
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raise(SIGTRAP);
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return EXIT_SUCCESS;
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} else if (!strcmp(arg, "heap-usage")) {
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abuse_heap();
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} else if (!strcmp(arg, "SIGSEGV-unmapped")) {
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char* map = mmap(NULL, 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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}
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fprintf(stderr, "%s OP\n", __progname);
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fprintf(stderr, "where OP is:\n");
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fprintf(stderr, " smash-stack overwrite a stack-guard canary\n");
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fprintf(stderr, " stack-overflow recurse until the stack overflows\n");
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fprintf(stderr, " heap-corruption cause a libc abort by corrupting the heap\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, " nostack crash with a NULL stack pointer\n");
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fprintf(stderr, " ctest (obsoleted by thread-crash?)\n");
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fprintf(stderr, " exit call exit(1)\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, " LOG_ALWAYS_FATAL call LOG_ALWAYS_FATAL\n");
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fprintf(stderr, " LOG_ALWAYS_FATAL_IF call LOG_ALWAYS_FATAL\n");
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fprintf(stderr, " SIGFPE cause a SIGFPE\n");
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fprintf(stderr, " SIGPIPE cause a SIGPIPE\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, "prefix any of the above with 'thread-' to not run\n");
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fprintf(stderr, "on the process' main thread.\n");
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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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{
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fprintf(stderr,"crasher: built at " __TIME__ "!@\n");
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if(argc > 1) {
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return do_action(argv[1]);
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} else {
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crash1();
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}
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return 0;
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}
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