Merge "Add a stack overflow test to crasher, and document all the options." (cb6a842c) · Commits · e / os / android_system_core

debuggerd/crasher.c

+38 −27

Original line number	Diff line number	Diff line
		@@ -17,6 +17,8 @@

		#include <cutils/sockets.h>

		extern const char* __progname;

		void crash1(void);
		void crashnostack(void);
		void maybeabort(void);
		@@ -47,20 +49,16 @@ int smash_stack(int i) {
		return (int)(&buf[0]);
		}

		void test_call1()
		{
		((int) 32) = 1;
		__attribute__((noinline)) void overflow_stack(void* p) {
		fprintf(stderr, "p = %p\n", p);
		void* buf[1];
		buf[0] = p;
		overflow_stack(&buf);
		}

		void test_thread(void x)
		void test_call1()
		{
		printf("crasher: thread pid=%d tid=%d\n", getpid(), gettid());

		sleep(1);
		test_call1();
		printf("goodbye\n");

		return 0;
		((int) 32) = 1;
		}

		void noisy(void x)
		@@ -118,35 +116,48 @@ __attribute__((noinline)) int crash(int a) {

		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-"));
		}

		if(!strcmp(arg,"smash-stack")) return smash_stack(42);
		if(!strcmp(arg,"nostack")) crashnostack();
		if(!strcmp(arg,"ctest")) return ctest();
		if(!strcmp(arg,"exit")) exit(1);
		if(!strcmp(arg,"crash")) return crash(42);
		if(!strcmp(arg,"abort")) maybeabort();

		pthread_t thr;
		pthread_attr_t attr;
		pthread_attr_init(&attr);
		pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
		pthread_create(&thr, &attr, test_thread, 0);
		while(1) sleep(1);
		} 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();
		}

		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, " 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");
		fprintf(stderr,"crasher: init pid=%d tid=%d\n", getpid(), gettid());

		if(argc > 1) {
		return do_action(argv[1]);
		} else {
		crash1();
		// ((int) 0) = 42;
		}

		return 0;