Add a stack overflow test to crasher, and document all the options.
Change-Id: Iebe80c24ef43f08d258881e7847516d414436931
diff --git a/debuggerd/crasher.c b/debuggerd/crasher.c
index 630d980..d88ef88 100644
--- a/debuggerd/crasher.c
+++ b/debuggerd/crasher.c
@@ -17,6 +17,8 @@
#include <cutils/sockets.h>
+extern const char* __progname;
+
void crash1(void);
void crashnostack(void);
void maybeabort(void);
@@ -47,22 +49,18 @@
return *(int*)(&buf[0]);
}
+__attribute__((noinline)) void overflow_stack(void* p) {
+ fprintf(stderr, "p = %p\n", p);
+ void* buf[1];
+ buf[0] = p;
+ overflow_stack(&buf);
+}
+
void test_call1()
{
*((int*) 32) = 1;
}
-void *test_thread(void *x)
-{
- printf("crasher: thread pid=%d tid=%d\n", getpid(), gettid());
-
- sleep(1);
- test_call1();
- printf("goodbye\n");
-
- return 0;
-}
-
void *noisy(void *x)
{
char c = (unsigned) x;
@@ -118,35 +116,48 @@
int do_action(const char* arg)
{
- if(!strncmp(arg, "thread-", strlen("thread-"))) {
+ 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();
}
- 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);
+ 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;