Linux sandbox: restrict setpriority() in baseline policy.

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 132 matching lines @@
   // fork() is never used as a system call (clone() is used instead), but we
   // have seen it in fallback code on Android.
   if (sysno == __NR_fork) {
     return Error(EPERM);
   }
 #endif
 
   if (sysno == __NR_futex)
     return RestrictFutex();
 
+  if (sysno == __NR_getpriority || sysno ==__NR_setpriority)
+    return RestrictGetSetpriority(current_pid);
+
   if (sysno == __NR_madvise) {
     // Only allow MADV_DONTNEED (aka MADV_FREE).
     const Arg<int> advice(2);
     return If(advice == MADV_DONTNEED, Allow()).Else(Error(EPERM));
   }
 
 #if defined(__i386__) || defined(__x86_64__) || defined(__mips__) || \
     defined(__aarch64__)
   if (sysno == __NR_mmap)
     return RestrictMmapFlags();
 #endif
 
 #if defined(__i386__) || defined(__arm__) || defined(__mips__)
   if (sysno == __NR_mmap2)
     return RestrictMmapFlags();
 #endif
 
   if (sysno == __NR_mprotect)
     return RestrictMprotectFlags();
 
   if (sysno == __NR_prctl)
-    return sandbox::RestrictPrctl();
+    return RestrictPrctl();
 
 #if defined(__x86_64__) || defined(__arm__) || defined(__mips__) || \
     defined(__aarch64__)
   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);
     const Arg<int> domain(0);
     return If(domain == AF_UNIX, Allow()).Else(CrashSIGSYS());
   }
 #endif
@@ skipping 60 matching lines @@
     DCHECK_EQ(syscall(__NR_getpid), current_pid_);
   }
   return EvaluateSyscallImpl(fs_denied_errno_, current_pid_, sysno);
 }
 
 ResultExpr BaselinePolicy::InvalidSyscall() const {
   return CrashSIGSYS();
 }
 
 }  // namespace sandbox.