[Android] Permit ftruncate under Seccomp-BPF.

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 44 matching lines @@
 SandboxBPFBasePolicyAndroid::~SandboxBPFBasePolicyAndroid() {}
 
 ResultExpr SandboxBPFBasePolicyAndroid::EvaluateSyscall(int sysno) const {
   bool override_and_allow = false;
 
   switch (sysno) {
     // TODO(rsesek): restrict clone parameters.
     case __NR_clone:
     case __NR_epoll_pwait:
     case __NR_flock:
+    case __NR_ftruncate:
+#if defined(__i386__) || defined(__arm__) || defined(__mips__)
+    case __NR_ftruncate64:
+#endif
 #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:
@@ skipping 58 matching lines @@
   }
 #endif
 
   if (override_and_allow)
     return Allow();
 
   return SandboxBPFBasePolicy::EvaluateSyscall(sysno);
 }
 
 }  // namespace content