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Add test for an Android kernel bug about prctl.

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Bug: 20017123

Change-Id: I8c109a06999a8bffcc8e8298b04ee637bb67d878
This commit is contained in:
Yabin Cui 2015-07-13 16:54:29 -07:00
parent 5e3dc45a16
commit 91ce715af1
2 changed files with 40 additions and 0 deletions
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1
tests/Android.mk
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@ -93,6 +93,7 @@ libBionicStandardTests_src_files := \
sys_epoll_test.cpp \
sys_mman_test.cpp \
sys_personality_test.cpp \
sys_prctl_test.cpp \
sys_procfs_test.cpp \
sys_resource_test.cpp \
sys_select_test.cpp \

39
tests/sys_prctl_test.cpp Normal file
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@ -0,0 +1,39 @@
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <unistd.h>
#include "private/bionic_prctl.h"
// http://b/20017123.
TEST(sys_prctl, bug_20017123) {
#if defined(__ANDROID__)
size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));
void* p = mmap(NULL, page_size * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_NE(MAP_FAILED, p);
ASSERT_EQ(0, mprotect(p, page_size, PROT_NONE));
ASSERT_NE(-1, prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, p, page_size * 3, "anonymous map space"));
volatile char* vp = reinterpret_cast<volatile char*>(p);
// Below memory access causes SEGV if the memory map is screwed up.
*(vp + page_size) = 0;
ASSERT_EQ(0, munmap(p, page_size * 3));
#else
GTEST_LOG_(INFO) << "This test does nothing as it tests an Android specific kernel feature.";
#endif
}