Linux sandbox: allow *kill in the GPU process.

BUG=367986
R=mdempsky@chromium.org
TBR=jorgelo

Review URL: https://codereview.chromium.org/252323005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267025 0039d316-1c4b-4281-b951-d872f2087c98

content/common/sandbox_linux/bpf_gpu_policy_linux.cc

@@ -185,6 +185,10 @@ ErrorCode GpuProcessPolicy::EvaluateSyscall(SandboxBPF* sandbox,
       DCHECK(broker_process_);
       return sandbox->Trap(GpuSIGSYS_Handler, broker_process_);
     default:
+      // Allow *kill from the GPU process temporarily until fork()
+      // is denied here.
+      if (SyscallSets::IsKill(sysno))
+        return ErrorCode(ErrorCode::ERR_ALLOWED);
       if (SyscallSets::IsEventFd(sysno))
         return ErrorCode(ErrorCode::ERR_ALLOWED);