File: free_race2.c

package info (click to toggle)
llvm-toolchain-16 1%3A16.0.6-15~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,634,792 kB
  • sloc: cpp: 6,179,261; ansic: 1,216,205; asm: 741,319; python: 196,614; objc: 75,325; f90: 49,640; lisp: 32,396; pascal: 12,286; sh: 9,394; perl: 7,442; ml: 5,494; awk: 3,523; makefile: 2,723; javascript: 1,206; xml: 886; fortran: 581; cs: 573
file content (37 lines) | stat: -rw-r--r-- 863 bytes parent folder | download | duplicates (25) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
// RUN: %clang_tsan -O1 -DACCESS_OFFSET=4 %s -o %t && %deflake %run %t | FileCheck %s
#include <stdlib.h>

#ifndef ACCESS_OFFSET
#define ACCESS_OFFSET 0
#endif

__attribute__((noinline)) void foo(void *mem) {
  free(mem);
}

__attribute__((noinline)) void baz(void *mem) {
  free(mem);
}

__attribute__((noinline)) void bar(void *mem) {
  *(long*)((char*)mem + ACCESS_OFFSET) = 42;
}

int main() {
  void *mem = malloc(100);
  baz(mem);
  mem = malloc(100);
  foo(mem);
  bar(mem);
  return 0;
}

// CHECK: WARNING: ThreadSanitizer: heap-use-after-free
// CHECK:   Write of size {{.*}} at {{.*}} by main thread:
// CHECK:     #0 bar
// CHECK:     #1 main
// CHECK:   Previous write of size 8 at {{.*}} by main thread:
// CHECK:     #0 free
// CHECK:     #{{1|2}} foo
// CHECK:     #{{2|3}} main