Implement DRM Native Pixmap using prime buffer

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 <libdrm/drm.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"
 
-#if defined(USE_VGEM_MAP)
-#include <libdrm/vgem_drm.h>
-#endif
-
 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())
-#if defined(USE_VGEM_MAP)
       // Type of DRM_IOCTL_XXX is unsigned long on IA and unsigned int on ARM.
       .SANDBOX_BPF_DSL_CASES(
           (static_cast<unsigned long>(DRM_IOCTL_GEM_CLOSE),
-           DRM_IOCTL_VGEM_MODE_MAP_DUMB, DRM_IOCTL_PRIME_FD_TO_HANDLE),
+           DRM_IOCTL_PRIME_FD_TO_HANDLE),

[piman, 2016/03/23 21:26:00]

Actually, do we still need these in the renderer? It sounds like we now directly
mmap the fd.

           Allow())
-#endif
       .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