ozone gbm: whitelist 3 DRM ioctl code for native GpuMemoryBuffer.

content/common/sandbox_linux/bpf_renderer_policy_linux.cc

Index: content/common/sandbox_linux/bpf_renderer_policy_linux.cc
diff --git a/content/common/sandbox_linux/bpf_renderer_policy_linux.cc b/content/common/sandbox_linux/bpf_renderer_policy_linux.cc
index bd252ff755718d5cb28e29252416b5b2c927f835..3f2304179db01de8616a09df068813f7f528d13c 100644
--- a/content/common/sandbox_linux/bpf_renderer_policy_linux.cc
+++ b/content/common/sandbox_linux/bpf_renderer_policy_linux.cc
@@ -5,22 +5,48 @@
 #include "content/common/sandbox_linux/bpf_renderer_policy_linux.h"
 
 #include <errno.h>
+#include <sys/ioctl.h>
 
 #include "base/basictypes.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),
+          Allow())
+#endif
+      .Default(sandbox::CrashSIGSYSIoctl());
+}
+
+}  // namespace
+
 RendererProcessPolicy::RendererProcessPolicy() {}
 RendererProcessPolicy::~RendererProcessPolicy() {}
 
@@ -31,7 +57,7 @@ ResultExpr RendererProcessPolicy::EvaluateSyscall(int sysno) const {
     case __NR_clock_getres:
       return sandbox::RestrictClockID();
     case __NR_ioctl:
-      return sandbox::RestrictIoctl();
+      return RestrictIoctl();
     // Allow the system calls below.
     case __NR_fdatasync:
     case __NR_fsync: