1 // Tests use-after-return detection and reporting.
2 // RUN: %clang_hwasan -g %s -o %t && not %run %t 2>&1 | FileCheck %s
3 // RUN: %clang_hwasan -g %s -o %t && not %env_hwasan_opts=symbolize=0 %run %t 2>&1 | FileCheck %s --check-prefix=NOSYM
4 
5 // REQUIRES: stable-runtime
6 
USE(void * x)7 void USE(void *x) { // pretend_to_do_something(void *x)
8   __asm__ __volatile__("" : : "r" (x) : "memory");
9 }
10 
11 __attribute__((noinline))
buggy()12 char *buggy() {
13   char zzz[0x1000];
14   char *volatile p = zzz;
15   return p;
16 }
17 
Unrelated1()18 __attribute__((noinline)) void Unrelated1() { int A[2]; USE(&A[0]); }
Unrelated2()19 __attribute__((noinline)) void Unrelated2() { int BB[3]; USE(&BB[0]); }
Unrelated3()20 __attribute__((noinline)) void Unrelated3() { int CCC[4]; USE(&CCC[0]); }
21 
main()22 int main() {
23   char *p = buggy();
24   Unrelated1();
25   Unrelated2();
26   Unrelated3();
27   return *p;
28   // CHECK: READ of size 1 at
29   // CHECK: #0 {{.*}} in main{{.*}}stack-uar.c:[[@LINE-2]]
30   // CHECK: is located in stack of thread
31   // CHECK: Potentially referenced stack objects:
32   // CHECK-NEXT: zzz in buggy {{.*}}stack-uar.c:[[@LINE-19]]
33   // CHECK-NEXT: Memory tags around the buggy address
34 
35   // NOSYM: Previously allocated frames:
36   // NOSYM-NEXT: record_addr:0x{{.*}} record:0x{{.*}} ({{.*}}/stack-uar.c.tmp+0x{{.*}}){{$}}
37   // NOSYM-NEXT: record_addr:0x{{.*}} record:0x{{.*}} ({{.*}}/stack-uar.c.tmp+0x{{.*}}){{$}}
38   // NOSYM-NEXT: record_addr:0x{{.*}} record:0x{{.*}} ({{.*}}/stack-uar.c.tmp+0x{{.*}}){{$}}
39   // NOSYM-NEXT: record_addr:0x{{.*}} record:0x{{.*}} ({{.*}}/stack-uar.c.tmp+0x{{.*}}){{$}}
40   // NOSYM-NEXT: Memory tags around the buggy address
41 
42   // CHECK: SUMMARY: HWAddressSanitizer: tag-mismatch {{.*}} in main
43 }
44