| |
| //#include <cutils/misc.h> |
| |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sched.h> |
| #include <errno.h> |
| |
| #include <signal.h> |
| #include <sys/ptrace.h> |
| #include <sys/wait.h> |
| #include <sys/socket.h> |
| |
| #include <pthread.h> |
| |
| #include <cutils/sockets.h> |
| |
| extern const char* __progname; |
| |
| void crash1(void); |
| void crashnostack(void); |
| static int do_action(const char* arg); |
| |
| static void maybeabort() { |
| if(time(0) != 42) { |
| abort(); |
| } |
| } |
| |
| static int smash_stack(int i) { |
| printf("crasher: deliberately corrupting stack...\n"); |
| // Unless there's a "big enough" buffer on the stack, gcc |
| // doesn't bother inserting checks. |
| char buf[8]; |
| // If we don't write something relatively unpredictable |
| // into the buffer and then do something with it, gcc |
| // optimizes everything away and just returns a constant. |
| *(int*)(&buf[7]) = (uintptr_t) &buf[0]; |
| return *(int*)(&buf[0]); |
| } |
| |
| static void* global = 0; // So GCC doesn't optimize the tail recursion out of overflow_stack. |
| |
| __attribute__((noinline)) static void overflow_stack(void* p) { |
| void* buf[1]; |
| buf[0] = p; |
| global = buf; |
| overflow_stack(&buf); |
| } |
| |
| static void test_call1() |
| { |
| *((int*) 32) = 1; |
| } |
| |
| static void *noisy(void *x) |
| { |
| char c = (unsigned) x; |
| for(;;) { |
| usleep(250*1000); |
| write(2, &c, 1); |
| if(c == 'C') *((unsigned*) 0) = 42; |
| } |
| return 0; |
| } |
| |
| static int ctest() |
| { |
| pthread_t thr; |
| pthread_attr_t attr; |
| pthread_attr_init(&attr); |
| pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| pthread_create(&thr, &attr, noisy, (void*) 'A'); |
| pthread_create(&thr, &attr, noisy, (void*) 'B'); |
| pthread_create(&thr, &attr, noisy, (void*) 'C'); |
| for(;;) ; |
| return 0; |
| } |
| |
| static void* thread_callback(void* raw_arg) |
| { |
| return (void*) do_action((const char*) raw_arg); |
| } |
| |
| static int do_action_on_thread(const char* arg) |
| { |
| pthread_t t; |
| pthread_create(&t, NULL, thread_callback, (void*) arg); |
| void* result = NULL; |
| pthread_join(t, &result); |
| return (int) result; |
| } |
| |
| __attribute__((noinline)) static int crash3(int a) { |
| *((int*) 0xdead) = a; |
| return a*4; |
| } |
| |
| __attribute__((noinline)) static int crash2(int a) { |
| a = crash3(a) + 2; |
| return a*3; |
| } |
| |
| __attribute__((noinline)) static int crash(int a) { |
| a = crash2(a) + 1; |
| return a*2; |
| } |
| |
| static void abuse_heap() { |
| char buf[16]; |
| free((void*) buf); // GCC is smart enough to warn about this, but we're doing it deliberately. |
| } |
| |
| static int do_action(const char* arg) |
| { |
| fprintf(stderr,"crasher: init pid=%d tid=%d\n", getpid(), gettid()); |
| |
| if (!strncmp(arg, "thread-", strlen("thread-"))) { |
| return do_action_on_thread(arg + strlen("thread-")); |
| } else if (!strcmp(arg,"smash-stack")) { |
| return smash_stack(42); |
| } else if (!strcmp(arg,"stack-overflow")) { |
| overflow_stack(NULL); |
| } else if (!strcmp(arg,"nostack")) { |
| crashnostack(); |
| } else if (!strcmp(arg,"ctest")) { |
| return ctest(); |
| } else if (!strcmp(arg,"exit")) { |
| exit(1); |
| } else if (!strcmp(arg,"crash")) { |
| return crash(42); |
| } else if (!strcmp(arg,"abort")) { |
| maybeabort(); |
| } else if (!strcmp(arg, "heap-usage")) { |
| abuse_heap(); |
| } |
| |
| fprintf(stderr, "%s OP\n", __progname); |
| fprintf(stderr, "where OP is:\n"); |
| fprintf(stderr, " smash-stack overwrite a stack-guard canary\n"); |
| fprintf(stderr, " stack-overflow recurse until the stack overflows\n"); |
| fprintf(stderr, " heap-corruption cause a libc abort by corrupting the heap\n"); |
| fprintf(stderr, " heap-usage cause a libc abort by abusing a heap function\n"); |
| fprintf(stderr, " nostack crash with a NULL stack pointer\n"); |
| fprintf(stderr, " ctest (obsoleted by thread-crash?)\n"); |
| fprintf(stderr, " exit call exit(1)\n"); |
| fprintf(stderr, " crash cause a SIGSEGV\n"); |
| fprintf(stderr, " abort call abort()\n"); |
| fprintf(stderr, "prefix any of the above with 'thread-' to not run\n"); |
| fprintf(stderr, "on the process' main thread.\n"); |
| return EXIT_SUCCESS; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| fprintf(stderr,"crasher: built at " __TIME__ "!@\n"); |
| |
| if(argc > 1) { |
| return do_action(argv[1]); |
| } else { |
| crash1(); |
| } |
| |
| return 0; |
| } |