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//===-- 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/sys/mman/mmap.h"
#include "src/sys/mman/mprotect.h"
#include "src/sys/mman/munmap.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include <signal.h>
#include <sys/mman.h>
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
using LlvmLibcMProtectTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
TEST_F(LlvmLibcMProtectTest, NoError) {
size_t alloc_size = 128;
void *addr = LIBC_NAMESPACE::mmap(nullptr, alloc_size, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
ASSERT_ERRNO_SUCCESS();
EXPECT_NE(addr, MAP_FAILED);
int *array = reinterpret_cast<int *>(addr);
// Reading from the memory should not crash the test.
// Since we used the MAP_ANONYMOUS flag, the contents of the newly
// allocated memory should be initialized to zero.
EXPECT_EQ(array[0], 0);
// By setting the memory protection to read and write, we should be able to
// modify that memory.
EXPECT_THAT(
LIBC_NAMESPACE::mprotect(addr, alloc_size, PROT_READ | PROT_WRITE),
Succeeds());
array[0] = 1;
EXPECT_EQ(array[0], 1);
EXPECT_THAT(LIBC_NAMESPACE::munmap(addr, alloc_size), Succeeds());
}
// This test is disabled currently due to flakeyness. It will be re-enabled once
// it is less flakey.
/*
TEST_F(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.
}
*/
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