Linux sandbox: restrict clock_gettime() and clock_getres()

content/common/sandbox_linux/bpf_renderer_policy_linux.cc

 // Copyright 2013 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 "content/common/sandbox_linux/bpf_renderer_policy_linux.h"
 
 #include <errno.h>
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "content/common/sandbox_linux/sandbox_linux.h"
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h"
 #include "sandbox/linux/services/linux_syscalls.h"
 
 using sandbox::SyscallSets;
 using sandbox::bpf_dsl::Allow;
 using sandbox::bpf_dsl::Error;
 using sandbox::bpf_dsl::ResultExpr;
 
 namespace content {
 
 RendererProcessPolicy::RendererProcessPolicy() {}
 RendererProcessPolicy::~RendererProcessPolicy() {}
 
 ResultExpr RendererProcessPolicy::EvaluateSyscall(int sysno) const {
   switch (sysno) {
+    // The baseline policy allows __NR_clock_gettime. Allow
+    // clock_getres() for V8. crbug.com/329053.
+    case __NR_clock_getres:
+      return sandbox::RestrictClockID();
     case __NR_ioctl:
       return sandbox::RestrictIoctl();
     // Allow the system calls below.
-    // The baseline policy allows __NR_clock_gettime. Allow
-    // clock_getres() for V8. crbug.com/329053.
-    case __NR_clock_getres:
     case __NR_fdatasync:
     case __NR_fsync:
 #if defined(__i386__) || defined(__x86_64__) || defined(__mips__)
     case __NR_getrlimit:
 #endif
 #if defined(__i386__) || defined(__arm__)
     case __NR_ugetrlimit:
 #endif
     case __NR_mremap:  // See crbug.com/149834.
     case __NR_pread64:
@@ skipping 10 matching lines @@
       return Allow();
     case __NR_prlimit64:
       return Error(EPERM);  // See crbug.com/160157.
     default:
       // Default on the content baseline policy.
       return SandboxBPFBasePolicy::EvaluateSyscall(sysno);
   }
 }
 
 }  // namespace content