xref: /llvm-project/compiler-rt/test/gwp_asan/free_then_overflow.cpp (revision dcf23e13615f88bdd4975058595ee60cf1d5811c) 
1*dcf23e13SMitch Phillips // REQUIRES: gwp_asan
2*dcf23e13SMitch Phillips // RUN: %clangxx_gwp_asan %s -o %t
3*dcf23e13SMitch Phillips // RUN: %expect_crash %run %t 2>&1 | FileCheck %s
4*dcf23e13SMitch Phillips 
5*dcf23e13SMitch Phillips // RUN: %clangxx_gwp_asan %s -o %t -DTOUCH_GUARD_PAGE
6*dcf23e13SMitch Phillips // RUN: %expect_crash %run %t 2>&1 | FileCheck %s
7*dcf23e13SMitch Phillips 
8*dcf23e13SMitch Phillips // CHECK: GWP-ASan detected a memory error
9*dcf23e13SMitch Phillips // CHECK: Use After Free
10*dcf23e13SMitch Phillips // CHECK-SAME: warning: buffer overflow/underflow detected on a free()'d allocation
11*dcf23e13SMitch Phillips // CHECK-SAME: at 0x{{[a-f0-9]+}} ({{[0-9]+}} byte{{s?}} to the right
12*dcf23e13SMitch Phillips 
13*dcf23e13SMitch Phillips #include <cstdlib>
14*dcf23e13SMitch Phillips 
15*dcf23e13SMitch Phillips #include "page_size.h"
16*dcf23e13SMitch Phillips 
main()17*dcf23e13SMitch Phillips int main() {
18*dcf23e13SMitch Phillips   unsigned malloc_size = 1;
19*dcf23e13SMitch Phillips #ifdef TOUCH_GUARD_PAGE
20*dcf23e13SMitch Phillips   malloc_size = pageSize();
21*dcf23e13SMitch Phillips #endif // TOUCH_GUARD_PAGE
22*dcf23e13SMitch Phillips   char *Ptr = reinterpret_cast<char *>(malloc(malloc_size));
23*dcf23e13SMitch Phillips   free(Ptr);
24*dcf23e13SMitch Phillips   volatile char x = *(Ptr + malloc_size);
25*dcf23e13SMitch Phillips   return 0;
26*dcf23e13SMitch Phillips }
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