[MIPS] Add seccomp bpf support

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 26 matching lines @@
          SyscallSets::IsAllowedGettime(sysno) ||
          SyscallSets::IsAllowedPrctl(sysno) ||
          SyscallSets::IsAllowedProcessStartOrDeath(sysno) ||
          SyscallSets::IsAllowedSignalHandling(sysno) ||
          SyscallSets::IsFutex(sysno) ||
          SyscallSets::IsGetSimpleId(sysno) ||
          SyscallSets::IsKernelInternalApi(sysno) ||
 #if defined(__arm__)
          SyscallSets::IsArmPrivate(sysno) ||
 #endif
+#if defined(__mips__)
+         SyscallSets::IsMipsSpecific(sysno) ||

[Kees Cook, 2014/05/02 22:06:35]

...Private vs ...Specific ?

[nedeljko, 2014/05/07 15:40:05]

There is no private syscall range on mips like there is on arm.
On the other hand, syscalls from this function are basically the same as
syscalls from IsArmPrivate, so I changed function name to IsMipsPrivate to
adhere to naming convention used for arm.

+#endif
          SyscallSets::IsAllowedOperationOnFd(sysno);
 }
 
 // System calls that will trigger the crashing SIGSYS handler.
 bool IsBaselinePolicyWatched(int sysno) {
   return SyscallSets::IsAdminOperation(sysno) ||
          SyscallSets::IsAdvancedScheduler(sysno) ||
          SyscallSets::IsAdvancedTimer(sysno) ||
          SyscallSets::IsAsyncIo(sysno) ||
          SyscallSets::IsDebug(sysno) ||
          SyscallSets::IsEventFd(sysno) ||
          SyscallSets::IsExtendedAttributes(sysno) ||
          SyscallSets::IsFaNotify(sysno) ||
          SyscallSets::IsFsControl(sysno) ||
          SyscallSets::IsGlobalFSViewChange(sysno) ||
          SyscallSets::IsGlobalProcessEnvironment(sysno) ||
          SyscallSets::IsGlobalSystemStatus(sysno) ||
          SyscallSets::IsInotify(sysno) ||
          SyscallSets::IsKernelModule(sysno) ||
          SyscallSets::IsKeyManagement(sysno) ||
          SyscallSets::IsKill(sysno) ||
          SyscallSets::IsMessageQueue(sysno) ||
          SyscallSets::IsMisc(sysno) ||
 #if defined(__x86_64__)
          SyscallSets::IsNetworkSocketInformation(sysno) ||
 #endif
          SyscallSets::IsNuma(sysno) ||
          SyscallSets::IsProcessGroupOrSession(sysno) ||
-#if defined(__i386__)
+#if defined(__i386__) || defined(__mips__)
          SyscallSets::IsSocketCall(sysno) ||
 #endif
 #if defined(__arm__)
          SyscallSets::IsArmPciConfig(sysno) ||
 #endif
+#if defined(__mips__)
+         SyscallSets::IsMipsMisc(sysno) ||
+#endif
          SyscallSets::IsTimer(sysno);
 }
 
 // |fs_denied_errno| is the errno return for denied filesystem access.
 ErrorCode EvaluateSyscallImpl(int fs_denied_errno,
                               pid_t current_pid,
                               SandboxBPF* sandbox,
                               int sysno) {
 #if defined(ADDRESS_SANITIZER)
   if (sysno == __NR_sigaltstack) {
     // Required for better stack overflow detection in ASan. Disallowed in
     // non-ASan builds.
     return ErrorCode(ErrorCode::ERR_ALLOWED);
   }
 #endif
   if (IsBaselinePolicyAllowed(sysno)) {
     return ErrorCode(ErrorCode::ERR_ALLOWED);
   }
 
-#if defined(__x86_64__) || defined(__arm__)
+#if defined(__x86_64__) || defined(__arm__) || defined(__mips__)
   if (sysno == __NR_socketpair) {
     // Only allow AF_UNIX, PF_UNIX. Crash if anything else is seen.
     COMPILE_ASSERT(AF_UNIX == PF_UNIX, af_unix_pf_unix_different);
     return sandbox->Cond(0, ErrorCode::TP_32BIT, ErrorCode::OP_EQUAL, AF_UNIX,
                          ErrorCode(ErrorCode::ERR_ALLOWED),
                          sandbox->Trap(CrashSIGSYS_Handler, NULL));
   }
 #endif
 
   if (sysno == __NR_madvise) {
     // Only allow MADV_DONTNEED (aka MADV_FREE).
     return sandbox->Cond(2, ErrorCode::TP_32BIT,
                          ErrorCode::OP_EQUAL, MADV_DONTNEED,
                          ErrorCode(ErrorCode::ERR_ALLOWED),
                          ErrorCode(EPERM));
   }
 
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__x86_64__) || defined(__mips__)
   if (sysno == __NR_mmap)
     return RestrictMmapFlags(sandbox);
 #endif
 
-#if defined(__i386__) || defined(__arm__)
+#if defined(__i386__) || defined(__arm__) || defined(__mips__)
   if (sysno == __NR_mmap2)
     return RestrictMmapFlags(sandbox);
 #endif
 
   if (sysno == __NR_mprotect)
     return RestrictMprotectFlags(sandbox);
 
   if (sysno == __NR_fcntl)
     return RestrictFcntlCommands(sandbox);
 
-#if defined(__i386__) || defined(__arm__)
+#if defined(__i386__) || defined(__arm__) || defined(__mips__)
   if (sysno == __NR_fcntl64)
     return RestrictFcntlCommands(sandbox);
 #endif
 
   if (SyscallSets::IsKill(sysno)) {
     return RestrictKillTarget(current_pid, sandbox, sysno);
   }
 
   if (SyscallSets::IsFileSystem(sysno) ||
       SyscallSets::IsCurrentDirectory(sysno)) {
     return ErrorCode(fs_denied_errno);
   }
 
   if (SyscallSets::IsAnySystemV(sysno)) {
     return ErrorCode(EPERM);
   }
 
   if (SyscallSets::IsUmask(sysno) ||
       SyscallSets::IsDeniedFileSystemAccessViaFd(sysno) ||
       SyscallSets::IsDeniedGetOrModifySocket(sysno) ||
       SyscallSets::IsProcessPrivilegeChange(sysno)) {
     return ErrorCode(EPERM);
   }
 
-#if defined(__i386__)
+#if defined(__i386__) || defined(__mips__)
   if (SyscallSets::IsSocketCall(sysno))
     return RestrictSocketcallCommand(sandbox);
 #endif
 
   if (IsBaselinePolicyWatched(sysno)) {
     // Previously unseen syscalls. TODO(jln): some of these should
     // be denied gracefully right away.
     return sandbox->Trap(CrashSIGSYS_Handler, NULL);
   }
 
@@ skipping 20 matching lines @@
 ErrorCode BaselinePolicy::EvaluateSyscall(SandboxBPF* sandbox,
                                           int sysno) const {
   // Make sure that this policy is used in the creating process.
   if (1 == sysno) {
     DCHECK_EQ(syscall(__NR_getpid), current_pid_);
   }
   return EvaluateSyscallImpl(fs_denied_errno_, current_pid_, sandbox, sysno);
 }
 
 }  // namespace sandbox.