gcc/testsuite/c-c++-common/asan/use-after-return-1.c

   1 /* { dg-do run } */
   2 /* { dg-set-target-env-var ASAN_OPTIONS "detect_stack_use_after_return=1" } */
   3 /* { dg-shouldfail "asan" } */
   4
   5 #include <stdio.h>
   6 #include <pthread.h>
   7
   8 #ifndef kSize
   9 # define kSize 1
  10 #endif
  11
  12 #ifndef UseThread
  13 # define UseThread 0
  14 #endif
  15
  16 __attribute__((noinline))
  17 char *Ident(char *x) {
  18   fprintf(stderr, "1: %p\n", x);
  19   return x;
  20 }
  21
  22 __attribute__((noinline))
  23 char *Func1() {
  24   char local[kSize];
  25   return Ident(local);
  26 }
  27
  28 __attribute__((noinline))
  29 void Func2(char *x) {
  30   fprintf(stderr, "2: %p\n", x);
  31   *x = 1;
  32 }
  33
  34 void *Thread(void *unused)  {
  35   Func2(Func1());
  36   return NULL;
  37 }
  38
  39 int main(int argc, char **argv) {
  40 #if UseThread
  41   pthread_t t;
  42   pthread_create(&t, 0, Thread, 0);
  43   pthread_join(t, 0);
  44 #else
  45   Func2(Func1());
  46 #endif
  47   return 0;
  48 }
  49
  50 /* { dg-output "WRITE of size 1 at .* thread T0.*" } */
  51 /* { dg-output "    #0.*(Func2)?.*use-after-return-1.(c:31)?.*" } */
  52 /* { dg-output "is located in stack of thread T0 at offset.*" } */
  53 /* { dg-output "\'local\' \\(line 24\\) <== Memory access at offset 32 is inside this variable" } */