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// RUN: %clangxx_asan -std=c++11 -O0 %s -o %t
// RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=READ
// RUN: not %run %t write 2>&1 | FileCheck %s --check-prefix=WRITE
// REQUIRES: x86-target-arch
#include <sys/mman.h>
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);
munmap(p, 4096);
if (argc == 1)
Read((int *)p);
else
Write((int *)p);
}
// READ: AddressSanitizer: SEGV on unknown address
// READ: The signal is caused by a READ memory access.
// WRITE: AddressSanitizer: SEGV on unknown address
// WRITE: The signal is caused by a WRITE memory access.
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