sandbox/linux: refactor bpf_dsl dependency on die.h

sandbox/linux/seccomp-bpf/sandbox_bpf.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/seccomp-bpf/sandbox_bpf.h"
 
 #include <errno.h>
 #include <sys/prctl.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/compiler_specific.h"
 #include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/third_party/valgrind/valgrind.h"
+#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
 #include "sandbox/linux/bpf_dsl/codegen.h"
 #include "sandbox/linux/bpf_dsl/policy.h"
 #include "sandbox/linux/bpf_dsl/policy_compiler.h"
 #include "sandbox/linux/bpf_dsl/seccomp_macros.h"
 #include "sandbox/linux/bpf_dsl/syscall_set.h"
 #include "sandbox/linux/seccomp-bpf/die.h"
 #include "sandbox/linux/seccomp-bpf/syscall.h"
 #include "sandbox/linux/seccomp-bpf/trap.h"
 #include "sandbox/linux/services/proc_util.h"
 #include "sandbox/linux/services/syscall_wrappers.h"
@@ skipping 73 matching lines @@
 }
 
 uint64_t EscapePC() {
   intptr_t rv = Syscall::Call(-1);
   if (rv == -1 && errno == ENOSYS) {
     return 0;
   }
   return static_cast<uint64_t>(static_cast<uintptr_t>(rv));
 }
 
+intptr_t SandboxPanicTrap(const struct arch_seccomp_data&, void* aux) {
+  SANDBOX_DIE(static_cast<const char*>(aux));
+}
+
+bpf_dsl::ResultExpr SandboxPanic(const char* error) {
+  return bpf_dsl::Trap(SandboxPanicTrap, error);
+}
+
 }  // namespace
 
 SandboxBPF::SandboxBPF(bpf_dsl::Policy* policy)
     : proc_fd_(), sandbox_has_started_(false), policy_(policy) {
 }
 
 SandboxBPF::~SandboxBPF() {
 }
 
 // static
@@ skipping 90 matching lines @@
     bool force_verification) {
 #if !defined(NDEBUG)
   force_verification = true;
 #endif
   DCHECK(policy_);
 
   bpf_dsl::PolicyCompiler compiler(policy_.get(), Trap::Registry());
   if (Trap::SandboxDebuggingAllowedByUser()) {
     compiler.DangerousSetEscapePC(EscapePC());
   }
+  compiler.SetPanicFunc(SandboxPanic);
   return compiler.Compile(force_verification);
 }
 
 void SandboxBPF::InstallFilter(bool must_sync_threads) {
   // We want to be very careful in not imposing any requirements on the
   // policies that are set with SetSandboxPolicy(). This means, as soon as
   // the sandbox is active, we shouldn't be relying on libraries that could
   // be making system calls. This, for example, means we should avoid
   // using the heap and we should avoid using STL functions.
   // Temporarily copy the contents of the "program" vector into a
@@ skipping 32 matching lines @@
   } else {
     if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog)) {
       SANDBOX_DIE("Kernel refuses to turn on BPF filters");
     }
   }
 
   sandbox_has_started_ = true;
 }
 
 }  // namespace sandbox