Fix crash with --use-gl=egl on Linux.

content/common/sandbox_linux/bpf_gpu_policy_linux.cc

Index: content/common/sandbox_linux/bpf_gpu_policy_linux.cc
diff --git a/content/common/sandbox_linux/bpf_gpu_policy_linux.cc b/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
index 74f9871fc30a92c8cd3abca5527c5ebb896937d1..0d4b8e33ca9edd0aecc0d76c1dfe0d776135b89e 100644
--- a/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
+++ b/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
@@ -169,7 +169,12 @@ bool UpdateProcessTypeAndEnableSandbox(sandbox::bpf_dsl::SandboxBPFDSLPolicy* (
 
 }  // namespace
 
-GpuProcessPolicy::GpuProcessPolicy() : broker_process_(NULL) {}
+GpuProcessPolicy::GpuProcessPolicy() : GpuProcessPolicy(false) {
+}
+
+GpuProcessPolicy::GpuProcessPolicy(bool allow_mincore)
+    : broker_process_(NULL), allow_mincore_(allow_mincore) {
+}
 
 GpuProcessPolicy::~GpuProcessPolicy() {}
 
@@ -198,6 +203,9 @@ ResultExpr GpuProcessPolicy::EvaluateSyscall(int sysno) const {
     case __NR_sched_getaffinity:
     case __NR_sched_setaffinity:
       return sandbox::RestrictSchedTarget(GetPolicyPid(), sysno);
+    case __NR_mincore:
+      if (allow_mincore_)
+        return Allow();

[Jorge Lucangeli Obes, 2014/10/20 19:01:07]

We try to keep this in alphabetical order, but it's tricky since if we put it
above mmap() it will fall through.

I think the best solution is to do:

case __NR_ioctl:
  return Allow();
case __NR_mincore:
  if (allow_mincore_)
    return Allow();
  else
    return SandboxBPFBasePolicy::EvaluateSyscall(sysno);

And put __NR_mincore right above mmap.

     default:
       if (SyscallSets::IsEventFd(sysno))
         return Allow();