llvm/libc/test/src/sys/mman/linux/mprotect_test.cpp

//===-- Unittests for mprotect --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/errno/libc_errno.h"
#include "src/sys/mman/mmap.h"
#include "src/sys/mman/mprotect.h"
#include "src/sys/mman/munmap.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"

#include <signal.h>
#include <sys/mman.h>

Fails;
Succeeds;

TEST(LlvmLibcMProtectTest, NoError) { … }

// This test is disabled currently due to flakeyness. It will be re-enabled once
// it is less flakey.
/*
TEST(LlvmLibcMProtectTest, Error_InvalidWrite) {
  // attempting to write to a read-only protected part of memory should cause a
  // segfault.
  EXPECT_DEATH(
      [] {
        size_t alloc_size = 128;
        void *addr =
            LIBC_NAMESPACE::mmap(nullptr, alloc_size, PROT_READ | PROT_WRITE,
                              MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
        LIBC_NAMESPACE::mprotect(addr, alloc_size, PROT_READ);

        (reinterpret_cast<char *>(addr))[0] = 'A';
      },
      WITH_SIGNAL(SIGSEGV));
  // Reading from a write only segment may succeed on some platforms, so there's
  // no test to check that.
}
*/