114 lines
4 KiB
C++
114 lines
4 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <inttypes.h>
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#include <limits.h>
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#include <stdio.h>
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#include <sys/capability.h>
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#include <sys/mman.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include <gtest/gtest.h>
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#include "android-base/file.h"
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#include "android-base/strings.h"
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#include "private/bionic_prctl.h"
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// http://b/20017123.
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TEST(sys_prctl, bug_20017123) {
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#if defined(__ANDROID__) // PR_SET_VMA is only available in Android kernels.
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size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));
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void* p = mmap(NULL, page_size * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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ASSERT_NE(MAP_FAILED, p);
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ASSERT_EQ(0, mprotect(p, page_size, PROT_NONE));
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ASSERT_NE(-1, prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, p, page_size * 3, "anonymous map space"));
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// Now read the maps and verify that there are no overlapped maps.
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std::string file_data;
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ASSERT_TRUE(android::base::ReadFileToString("/proc/self/maps", &file_data));
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uintptr_t last_end = 0;
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std::vector<std::string> lines = android::base::Split(file_data, "\n");
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for (size_t i = 0; i < lines.size(); i++) {
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if (lines[i].empty()) {
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continue;
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}
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uintptr_t start;
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uintptr_t end;
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ASSERT_EQ(2, sscanf(lines[i].c_str(), "%" SCNxPTR "-%" SCNxPTR " ", &start, &end))
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<< "Failed to parse line: " << lines[i];
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// This will never fail on the first line, so no need to do any special checking.
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ASSERT_GE(start, last_end)
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<< "Overlapping map detected:\n" << lines[i -1] << '\n' << lines[i] << '\n';
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last_end = end;
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}
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ASSERT_EQ(0, munmap(p, page_size * 3));
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#else
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GTEST_LOG_(INFO) << "This test does nothing as it tests an Android specific kernel feature.";
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#endif
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}
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TEST(sys_prctl, pr_cap_ambient) {
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// PR_CAP_AMBIENT was introduced in v4.3. Android devices should always
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// have a backport, but we can't guarantee it's available on the host.
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#if defined(__ANDROID__) || defined(PR_CAP_AMBIENT)
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const std::string caps_sha =
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"https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/"
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"?id=58319057b7847667f0c9585b9de0e8932b0fdb08";
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const std::string caps_typo_sha =
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"https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/"
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"?id=b7f76ea2ef6739ee484a165ffbac98deb855d3d3";
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auto err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0);
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EXPECT_EQ(0, err);
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// EINVAL -> unrecognized prctl option
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ASSERT_NE(EINVAL, errno) << "kernel missing required commits:\n"
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<< caps_sha << "\n"
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<< caps_typo_sha << "\n";
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// Unprivileged processes shouldn't be able to raise CAP_SYS_ADMIN,
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// but they can check or lower it
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err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_SYS_ADMIN, 0, 0);
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EXPECT_EQ(-1, err);
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EXPECT_EQ(EPERM, errno);
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err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_SYS_ADMIN, 0, 0);
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EXPECT_EQ(0, err);
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err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_LOWER, CAP_SYS_ADMIN, 0, 0);
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EXPECT_EQ(0, err);
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// ULONG_MAX isn't a legal cap
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err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, ULONG_MAX, 0, 0);
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EXPECT_EQ(-1, err);
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EXPECT_EQ(EINVAL, errno);
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err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, ULONG_MAX, 0, 0);
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EXPECT_EQ(-1, err);
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EXPECT_EQ(EINVAL, errno);
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err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_LOWER, ULONG_MAX, 0, 0);
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EXPECT_EQ(-1, err);
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EXPECT_EQ(EINVAL, errno);
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#else
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GTEST_LOG_(INFO)
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<< "Skipping test that requires host support for PR_CAP_AMBIENT.";
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#endif
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}
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