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// Copyright 2018 The gVisor Authors.
//
// 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.
#define _GNU_SOURCE 1
#include <signal.h>
#include <ucontext.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
__attribute__((noinline)) void Fault(void) {
volatile int* foo = nullptr;
*foo = 0;
}
int GetPcFromUcontext(ucontext_t* uc, uintptr_t* pc) {
#if defined(__x86_64__)
*pc = uc->uc_mcontext.gregs[REG_RIP];
return 1;
#elif defined(__i386__)
*pc = uc->uc_mcontext.gregs[REG_EIP];
return 1;
#elif defined(__aarch64__)
*pc = uc->uc_mcontext.pc;
return 1;
#else
return 0;
#endif
}
void sigact_handler(int sig, siginfo_t* siginfo, void* context) {
uintptr_t pc;
if (GetPcFromUcontext(reinterpret_cast<ucontext_t*>(context), &pc)) {
/* Expect Fault() to be at most 64 bytes in size. */
uintptr_t fault_addr = reinterpret_cast<uintptr_t>(&Fault);
EXPECT_GE(pc, fault_addr);
EXPECT_LT(pc, fault_addr + 64);
exit(0);
}
}
TEST(FaultTest, InRange) {
// Reset the signal handler to do nothing so that it doesn't freak out
// the test runner when we fire an alarm.
struct sigaction sa = {};
sa.sa_sigaction = sigact_handler;
sigfillset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
ASSERT_THAT(sigaction(SIGSEGV, &sa, nullptr), SyscallSucceeds());
Fault();
}
} // namespace
} // namespace testing
} // namespace gvisor
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