[Android] Permit __NR_msync under the seccomp sandbox.

content/common/sandbox_linux/android/sandbox_bpf_base_policy_android.cc

 // Copyright 2014 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 "content/common/sandbox_linux/android/sandbox_bpf_base_policy_android.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/net.h>
 #include <sys/socket.h>
@@ skipping 60 matching lines @@
 #if defined(__x86_64__) || defined(__aarch64__)
     case __NR_newfstatat:
     case __NR_getdents64:
 #elif defined(__i386__) || defined(__arm__) || defined(__mips__)
     case __NR_fstatat64:
     case __NR_getdents:
 #endif
     case __NR_getpriority:
     case __NR_ioctl:
     case __NR_mremap:
+    case __NR_msync:
     // File system access cannot be restricted with seccomp-bpf on Android,
     // since the JVM classloader and other Framework features require file
     // access. It may be possible to restrict the filesystem with SELinux.
     // Currently we rely on the app/service UID isolation to create a
     // filesystem "sandbox".
 #if !defined(ARCH_CPU_ARM64)
     case __NR_open:
 #endif
     case __NR_openat:
     case __NR_pread64:
@@ skipping 54 matching lines @@
   }
 #endif
 
   if (override_and_allow)
     return Allow();
 
   return SandboxBPFBasePolicy::EvaluateSyscall(sysno);
 }
 
 }  // namespace content