Linux sandbox: Restrict sched_* syscalls on the GPU and ppapi processes.

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

 // Copyright (c) 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 "sandbox/linux/seccomp-bpf-helpers/baseline_policy.h"
 
 #include <errno.h>
 #include <sys/mman.h>
 #include <sys/socket.h>
 #include <sys/syscall.h>
@@ skipping 216 matching lines @@
   }
 
   // In any other case crash the program with our SIGSYS handler.
   return CrashSIGSYS();
 }
 
 }  // namespace.
 
 // Unfortunately C++03 doesn't allow delegated constructors.
 // Call other constructor when C++11 lands.
-BaselinePolicy::BaselinePolicy()
-    : fs_denied_errno_(EPERM), current_pid_(syscall(__NR_getpid)) {}
+BaselinePolicy::BaselinePolicy() : BaselinePolicy(EPERM) {}
 
 BaselinePolicy::BaselinePolicy(int fs_denied_errno)
-    : fs_denied_errno_(fs_denied_errno), current_pid_(syscall(__NR_getpid)) {}
+    : fs_denied_errno_(fs_denied_errno), policy_pid_(syscall(__NR_getpid)) {}
 
 BaselinePolicy::~BaselinePolicy() {
   // Make sure that this policy is created, used and destroyed by a single
   // process.
-  DCHECK_EQ(syscall(__NR_getpid), current_pid_);
+  DCHECK_EQ(syscall(__NR_getpid), policy_pid_);
 }
 
 ResultExpr BaselinePolicy::EvaluateSyscall(int sysno) const {
   // Sanity check that we're only called with valid syscall numbers.
   DCHECK(SandboxBPF::IsValidSyscallNumber(sysno));
   // Make sure that this policy is used in the creating process.
   if (1 == sysno) {
-    DCHECK_EQ(syscall(__NR_getpid), current_pid_);
+    DCHECK_EQ(syscall(__NR_getpid), policy_pid_);
   }
-  return EvaluateSyscallImpl(fs_denied_errno_, current_pid_, sysno);
+  return EvaluateSyscallImpl(fs_denied_errno_, policy_pid_, sysno);
 }
 
 ResultExpr BaselinePolicy::InvalidSyscall() const {
   return CrashSIGSYS();
 }
 
 }  // namespace sandbox.