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| // Tests UAF detection where Allocate/Deallocate/Use
// happen in separate threads.
// RUN: %clang_hwasan %s -o %t && not %run %t 2>&1 | FileCheck %s
// REQUIRES: stable-runtime
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <sanitizer/hwasan_interface.h>
char *volatile x;
int state;
void *Allocate(void *arg) {
x = (char*)malloc(10);
__sync_fetch_and_add(&state, 1);
while (__sync_fetch_and_add(&state, 0) != 3) {}
return NULL;
}
void *Deallocate(void *arg) {
free(x);
__sync_fetch_and_add(&state, 1);
while (__sync_fetch_and_add(&state, 0) != 3) {}
return NULL;
}
void *Use(void *arg) {
x[5] = 42;
// CHECK: ERROR: HWAddressSanitizer: tag-mismatch on address
// CHECK: WRITE of size 1 {{.*}} in thread T3
// CHECK: thread-uaf.c:[[@LINE-3]]
// CHECK: freed by thread T2 here
// CHECK: in Deallocate
// CHECK: previously allocated here:
// CHECK: in Allocate
// CHECK: Thread: T2 0x
// CHECK: Thread: T3 0x
// CHECK-DAG: Thread: T0 0x
// CHECK-DAG: Thread: T1 0x
__sync_fetch_and_add(&state, 1);
return NULL;
}
int main() {
__hwasan_enable_allocator_tagging();
pthread_t t1, t2, t3;
pthread_create(&t1, NULL, Allocate, NULL);
while (__sync_fetch_and_add(&state, 0) != 1) {}
pthread_create(&t2, NULL, Deallocate, NULL);
while (__sync_fetch_and_add(&state, 0) != 2) {}
pthread_create(&t3, NULL, Use, NULL);
pthread_join(t1, NULL);
pthread_join(t2, NULL);
pthread_join(t3, NULL);
}
|