ui/ozone: Flush CPU caches when mapping/unmapping prime pixmap

content/common/sandbox_linux/bpf_renderer_policy_linux.cc

 // Copyright 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 "content/common/sandbox_linux/bpf_renderer_policy_linux.h"
 
 #include <errno.h>
+#include <linux/dma-buf.h>
 #include <sys/ioctl.h>
 
 #include "build/build_config.h"
 #include "content/common/sandbox_linux/sandbox_linux.h"
 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"
 #include "sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.h"
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
 #include "sandbox/linux/system_headers/linux_syscalls.h"
 
 using sandbox::SyscallSets;
 using sandbox::bpf_dsl::Allow;
 using sandbox::bpf_dsl::Arg;
 using sandbox::bpf_dsl::Error;
 using sandbox::bpf_dsl::ResultExpr;
 
 namespace content {
 
 namespace {
 
 ResultExpr RestrictIoctl() {
   const Arg<unsigned long> request(1);
   return Switch(request)
       .SANDBOX_BPF_DSL_CASES((static_cast<unsigned long>(TCGETS), FIONREAD),
                              Allow())
+      .SANDBOX_BPF_DSL_CASES((static_cast<unsigned long>(DMA_BUF_IOCTL_SYNC)),
+                             Allow())

[spang, 2016/03/30 00:19:00]

I'm fairly certain this is going to cause compile errors, and you'll probably
need to scope it narrower than "all linux builds".

[vignatti (out of this project), 2016/03/30 14:58:37]

yeah, I was thinking the same. Did you read what I wrote about that in my last
reply above? I'm thinking to opt out entirely native dma-buf pixmap support for
regular Linuxes...

       .Default(sandbox::CrashSIGSYSIoctl());
 }
 
 }  // namespace
 
 RendererProcessPolicy::RendererProcessPolicy() {}
 RendererProcessPolicy::~RendererProcessPolicy() {}
 
 ResultExpr RendererProcessPolicy::EvaluateSyscall(int sysno) const {
   switch (sysno) {
@@ skipping 29 matching lines @@
       return sandbox::RestrictSchedTarget(GetPolicyPid(), sysno);
     case __NR_prlimit64:
       return Error(EPERM);  // See crbug.com/160157.
     default:
       // Default on the content baseline policy.
       return SandboxBPFBasePolicy::EvaluateSyscall(sysno);
   }
 }
 
 }  // namespace content