Syscall: Fix Syscall::Call's X86-64 implementation for CFI unwinding

sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/linux/seccomp-bpf-helpers/baseline_policy.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/futex.h>
 #include <sched.h>
@@ skipping 195 matching lines @@
 }
 
 BPF_TEST_C(BaselinePolicy, EPERM_getcwd, BaselinePolicy) {
   errno = 0;
   char buf[1024];
   char* cwd = getcwd(buf, sizeof(buf));
   BPF_ASSERT_EQ(NULL, cwd);
   BPF_ASSERT_EQ(EPERM, errno);
 }
 
-// TODO(jorgelo): re-enable this after crbug.com/424973 is fixed.
-#if !defined(OS_CHROMEOS)
 BPF_DEATH_TEST_C(BaselinePolicy,
                  SIGSYS_InvalidSyscall,
                  DEATH_SEGV_MESSAGE(GetErrorMessageContentForTests()),
                  BaselinePolicy) {
   Syscall::InvalidCall();
 }
-#endif
 
 // A failing test using this macro could be problematic since we perform
 // system calls by passing "0" as every argument.
 // The kernel could SIGSEGV the process or the system call itself could reboot
 // the machine. Some thoughts have been given when hand-picking the system
 // calls below to limit any potential side effects outside of the current
 // process.
 #define TEST_BASELINE_SIGSYS(sysno)                                      \
   BPF_DEATH_TEST_C(BaselinePolicy,                                       \
                    SIGSYS_##sysno,                                       \
@@ skipping 110 matching lines @@
                  ClockGettimeWithDisallowedClockCrashes,
                  DEATH_SEGV_MESSAGE(sandbox::GetErrorMessageContentForTests()),
                  BaselinePolicy) {
   struct timespec ts;
   clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
 }
 
 }  // namespace
 
 }  // namespace sandbox