SyscallSet: add ValidOnly

sandbox/linux/bpf_dsl/policy_compiler.cc

 // Copyright (c) 2012 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/bpf_dsl/policy_compiler.h"
 
 #include <errno.h>
 #include <linux/filter.h>
 #include <sys/syscall.h>
 
@@ skipping 58 matching lines @@
   // ultimately do so for us.
   int err = reinterpret_cast<intptr_t>(aux) & SECCOMP_RET_DATA;
   return -err;
 }
 
 intptr_t BPFFailure(const struct arch_seccomp_data&, void* aux) {
   SANDBOX_DIE(static_cast<char*>(aux));
 }
 
 bool HasUnsafeTraps(const SandboxBPFDSLPolicy* policy) {
-  for (uint32_t sysnum : SyscallSet::All()) {
-    if (SyscallSet::IsValid(sysnum) &&
-        policy->EvaluateSyscall(sysnum)->HasUnsafeTraps()) {
+  for (uint32_t sysnum : SyscallSet::ValidOnly()) {
+    if (policy->EvaluateSyscall(sysnum)->HasUnsafeTraps()) {
       return true;
     }
   }
   return policy->InvalidSyscall()->HasUnsafeTraps();
 }
 
 }  // namespace
 
 struct PolicyCompiler::Range {
   Range(uint32_t f, const ErrorCode& e) : from(f), err(e) {}
@@ skipping 422 matching lines @@
                    &*conds_.insert(passed).first,
                    &*conds_.insert(failed).first);
 }
 
 ErrorCode PolicyCompiler::Kill(const char* msg) {
   return Trap(BPFFailure, const_cast<char*>(msg));
 }
 
 }  // namespace bpf_dsl
 }  // namespace sandbox