# # Upstream patch which came too late to be included in Chromium 65. # From 6b1b6d3a8555075e23cca89335e855d55f35fba9 Mon Sep 17 00:00:00 2001 From: Zhenyao Mo Date: Thu, 29 Mar 2018 23:48:19 +0000 Subject: [PATCH] Allow `stat` in Linux for GPU process for a list of files. This is to unblock certain NVidia driver's glReadPixels calls in the sandboxed GPU process. Note that the needed file /dev/nvidiactl is already in the list for read/write. BUG=817400 TEST=manual R=tsepez@chromium.org Change-Id: I9074a8335a9c4df1487f5a288d5e284bbedf67c3 Reviewed-on: https://chromium-review.googlesource.com/965462 Reviewed-by: Zhenyao Mo Reviewed-by: Tom Sepez Reviewed-by: Robert Sesek Reviewed-by: Kenneth Russell Commit-Queue: Zhenyao Mo Cr-Commit-Position: refs/heads/master@{#547027} --- content/gpu/gpu_sandbox_hook_linux.cc | 5 ++++- .../service_manager/sandbox/linux/bpf_gpu_policy_linux.cc | 15 ++++++++++++++- 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/content/gpu/gpu_sandbox_hook_linux.cc b/content/gpu/gpu_sandbox_hook_linux.cc index ddd7b99485fe..cd914e2f9926 100644 --- a/content/gpu/gpu_sandbox_hook_linux.cc +++ b/content/gpu/gpu_sandbox_hook_linux.cc @@ -153,6 +153,7 @@ void AddStandardGpuWhiteList(std::vector* permissions) { static const char kDriCardBasePath[] = "/dev/dri/card"; static const char kNvidiaCtlPath[] = "/dev/nvidiactl"; static const char kNvidiaDeviceBasePath[] = "/dev/nvidia"; + static const char kNvidiaDeviceModeSetPath[] = "/dev/nvidia-modeset"; static const char kNvidiaParamsPath[] = "/proc/driver/nvidia/params"; static const char kDevShm[] = "/dev/shm/"; @@ -172,6 +173,8 @@ void AddStandardGpuWhiteList(std::vector* permissions) { permissions->push_back(BrokerFilePermission::ReadWrite( base::StringPrintf("%s%d", kNvidiaDeviceBasePath, i))); } + permissions->push_back( + BrokerFilePermission::ReadWrite(kNvidiaDeviceModeSetPath)); permissions->push_back(BrokerFilePermission::ReadOnly(kNvidiaParamsPath)); } @@ -262,9 +265,9 @@ sandbox::syscall_broker::BrokerCommandSet CommandSetForGPU( sandbox::syscall_broker::BrokerCommandSet command_set; command_set.set(sandbox::syscall_broker::COMMAND_ACCESS); command_set.set(sandbox::syscall_broker::COMMAND_OPEN); + command_set.set(sandbox::syscall_broker::COMMAND_STAT); if (IsChromeOS() && options.use_amd_specific_policies) { command_set.set(sandbox::syscall_broker::COMMAND_READLINK); - command_set.set(sandbox::syscall_broker::COMMAND_STAT); } return command_set; } diff --git a/services/service_manager/sandbox/linux/bpf_gpu_policy_linux.cc b/services/service_manager/sandbox/linux/bpf_gpu_policy_linux.cc index bc16952c0898..d683aacc76f4 100644 --- a/services/service_manager/sandbox/linux/bpf_gpu_policy_linux.cc +++ b/services/service_manager/sandbox/linux/bpf_gpu_policy_linux.cc @@ -61,7 +61,20 @@ ResultExpr GpuProcessPolicy::EvaluateSyscall(int sysno) const { case __NR_open: #endif // !defined(__aarch64__) case __NR_faccessat: - case __NR_openat: { + case __NR_openat: +#if defined(__NR_stat) + case __NR_stat: +#endif +#if defined(__NR_stat64) + case __NR_stat64: +#endif +#if defined(__NR_fstatat) + case __NR_fstatat: +#endif +#if defined(__NR_newfstatat) + case __NR_newfstatat: +#endif + { auto* broker_process = SandboxLinux::GetInstance()->broker_process(); DCHECK(broker_process); return Trap(BrokerProcess::SIGSYS_Handler, broker_process); -- 2.16.2