49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// Copyright 2018 Google LLC
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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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#include <asm/prctl.h>
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#include <sys/prctl.h>
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#include "gtest/gtest.h"
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#include "test/util/test_util.h"
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// glibc does not provide a prototype for arch_prctl() so declare it here.
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extern "C" int arch_prctl(int code, uintptr_t addr);
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namespace gvisor {
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namespace testing {
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namespace {
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TEST(ArchPrctlTest, GetSetFS) {
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uintptr_t orig;
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const uintptr_t kNonCanonicalFsbase = 0x4141414142424242;
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// Get the original FS.base and then set it to the same value (this is
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// intentional because FS.base is the TLS pointer so we cannot change it
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// arbitrarily).
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ASSERT_THAT(arch_prctl(ARCH_GET_FS, reinterpret_cast<uintptr_t>(&orig)),
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SyscallSucceeds());
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ASSERT_THAT(arch_prctl(ARCH_SET_FS, orig), SyscallSucceeds());
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// Trying to set FS.base to a non-canonical value should return an error.
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ASSERT_THAT(arch_prctl(ARCH_SET_FS, kNonCanonicalFsbase),
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SyscallFailsWithErrno(EPERM));
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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