72 lines
1.8 KiB
C++
72 lines
1.8 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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#define _GNU_SOURCE 1
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#include <signal.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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__attribute__((noinline)) void Fault(void) {
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volatile int* foo = nullptr;
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*foo = 0;
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}
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int GetPcFromUcontext(ucontext_t* uc, uintptr_t* pc) {
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#if defined(__x86_64__)
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*pc = uc->uc_mcontext.gregs[REG_RIP];
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return 1;
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#elif defined(__i386__)
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*pc = uc->uc_mcontext.gregs[REG_EIP];
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return 1;
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#else
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return 0;
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#endif
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}
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void sigact_handler(int sig, siginfo_t* siginfo, void* context) {
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uintptr_t pc;
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if (GetPcFromUcontext(reinterpret_cast<ucontext_t*>(context), &pc)) {
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/* Expect Fault() to be at most 64 bytes in size. */
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uintptr_t fault_addr = reinterpret_cast<uintptr_t>(&Fault);
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EXPECT_GE(pc, fault_addr);
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EXPECT_LT(pc, fault_addr + 64);
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exit(0);
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}
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}
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TEST(FaultTest, InRange) {
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// Reset the signal handler to do nothing so that it doesn't freak out
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// the test runner when we fire an alarm.
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struct sigaction sa = {};
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sa.sa_sigaction = sigact_handler;
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sigfillset(&sa.sa_mask);
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sa.sa_flags = SA_SIGINFO;
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ASSERT_THAT(sigaction(SIGSEGV, &sa, nullptr), SyscallSucceeds());
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Fault();
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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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