[asan] Clean up some confusing code in
`test/asan/TestCases/Darwin/segv_read_write.c`
* The `fd` arg passed to `mmap()` should be `-1`. It is not defined
what passing `0` does on Darwin.
* The comment about the shadow memory doesn't make any sense to me,
so I'm removing it.
@@ -9,11 +9,8 @@ static volatile int sink;
__attribute__((noinline)) void Read(int *ptr) { sink = *ptr; }
__attribute__((noinline)) void Write(int *ptr) { *ptr = 0; }
int main(int argc, char **argv) {
- // Writes to shadow are detected as reads from shadow gap (because of how the
- // shadow mapping works). This is kinda hard to fix. Test a random address in
- // the application part of the address space.
void *volatile p =
- mmap(nullptr, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, 0, 0);
+ mmap(nullptr, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0);
munmap(p, 4096);
if (argc == 1)
Read((int *)p);
