File: many-threads-uaf.c

package info (click to toggle)
swiftlang 6.1.3-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,532 kB
  • sloc: cpp: 9,901,743; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (44 lines) | stat: -rw-r--r-- 1,039 bytes parent folder | download | duplicates (5) 
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
38
39
40
41
42
43
44
 
// RUN: %clang_hwasan %s -o %t && not %env_hwasan_opts=verbose_threads=1 %run %t 2>&1 | FileCheck %s

#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>

#include <sanitizer/hwasan_interface.h>

void *BoringThread(void *arg) {
  char * volatile x = (char*)malloc(10);
  x[5] = 0;
  free(x);
  return NULL;
}

// CHECK: Creating  : T0
// CHECK: Creating  : T1
// CHECK: Destroying: T1
// CHECK: Creating  : T1100
// CHECK: Destroying: T1100
// CHECK: Creating  : T1101

void *UAFThread(void *arg) {
  char * volatile x = (char*)malloc(10);
  fprintf(stderr, "ZZZ %p\n", x);
  free(x);
  x[5] = 42;
  // CHECK: ERROR: HWAddressSanitizer: tag-mismatch on address
  // CHECK: WRITE of size 1
  // CHECK: many-threads-uaf.c:[[@LINE-3]]
  // CHECK: Thread: T1101
  return NULL;
}

int main() {
  __hwasan_enable_allocator_tagging();
  pthread_t t;
  for (int i = 0; i < 1100; i++) {
    pthread_create(&t, NULL, BoringThread, NULL);
    pthread_join(t, NULL);
  }
  pthread_create(&t, NULL, UAFThread, NULL);
  pthread_join(t, NULL);
}