1 // RUN: %clangxx_asan -std=c++11 -O0 %s -o %t
2 // RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=READ
3 // RUN: not %run %t write 2>&1 | FileCheck %s --check-prefix=WRITE
4 // REQUIRES: x86-target-arch
5
6 #include <sys/mman.h>
7
8 static volatile int sink;
Read(int * ptr)9 __attribute__((noinline)) void Read(int *ptr) { sink = *ptr; }
Write(int * ptr)10 __attribute__((noinline)) void Write(int *ptr) { *ptr = 0; }
main(int argc,char ** argv)11 int main(int argc, char **argv) {
12 // Writes to shadow are detected as reads from shadow gap (because of how the
13 // shadow mapping works). This is kinda hard to fix. Test a random address in
14 // the application part of the address space.
15 void *volatile p =
16 mmap(nullptr, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, 0, 0);
17 munmap(p, 4096);
18 if (argc == 1)
19 Read((int *)p);
20 else
21 Write((int *)p);
22 }
23 // READ: AddressSanitizer: SEGV on unknown address
24 // READ: The signal is caused by a READ memory access.
25 // WRITE: AddressSanitizer: SEGV on unknown address
26 // WRITE: The signal is caused by a WRITE memory access.
27