Open source system call tests.

PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22

1 files changed, 71 insertions, 0 deletions

diff --git a/test/syscalls/linux/fault.cc b/test/syscalls/linux/fault.cc
new file mode 100644
index 000000000..cfa7d0d1f
--- /dev/null
+++ b/test/syscalls/linux/fault.cc
@@ -0,0 +1,71 @@
+// Copyright 2018 Google LLC
+//
+// 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;
+#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