Add a new driver bug workaround SANDBOX_START_EARLY

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 d356897d9e0740668884c496307960ca5c91dddb..94414af4dc017dbe406fbf457f2c6e45fe546d10 100644
--- a/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
+++ b/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
@@ -22,6 +22,7 @@
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/sys_info.h"
 #include "build/build_config.h"
 #include "content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h"
 #include "content/common/sandbox_linux/sandbox_seccomp_bpf_linux.h"
@@ -33,6 +34,7 @@
 #include "sandbox/linux/syscall_broker/broker_file_permission.h"
 #include "sandbox/linux/syscall_broker/broker_process.h"
 #include "sandbox/linux/system_headers/linux_syscalls.h"
+#include "ui/gl/gl_implementation.h"
 
 using sandbox::arch_seccomp_data;
 using sandbox::bpf_dsl::Allow;
@@ -324,6 +326,56 @@ bool GpuProcessPolicy::PreSandboxHook() {
     }
   }
 
+  // If kGpuSandboxStartEarly is set then we need to warmup by loading gl and
+  // driver libraries before to actually run the sandbox. Another approach would
+  // be to white list these libraries using the broker file permissons. But
+  // that would require to white list all single dependencies which is not easy
+  // and there is no much value compared to the following.
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+  if (command_line.HasSwitch(switches::kGpuSandboxStartEarly)) {
+    // uname is used from GpuControlList when calling
+    // gpu::ApplyGpuDriverBugWorkarounds.
+    base::SysInfo::OperatingSystemVersion();
+
+    gfx::GLImplementation gl_iml = gfx::kGLImplementationNone;
+    bool fallback_to_osmesa = false;
+    bool result = gfx::SelectGLImplementation(&gl_iml, &fallback_to_osmesa);
+    if (!result)
+      LOG(ERROR) << "Failed to select a gl implementation";
+
+    std::vector<std::string> driver_libraries;
+    if (result) {
+      result = gfx::GetNativeLibraryNamesFromGLImplementation(
+          gl_iml, &driver_libraries);
+      if (!result)
+        LOG(ERROR) << "Failed to retrieve libraries for "
+                   << gfx::GetGLImplementationName(gl_iml);
+    }
+
+#if defined(DRI_DRIVER_DIR)
+    // Mesa always fallback to software driver in the 3 following cases:
+    // 1- there is no real driver.
+    // 2- it fails to load a real driver.
+    // 3- User set the env var LIBGL_ALWAYS_SOFTWARE.
+    if (result && command_line.HasSwitch(switches::kGpuDriverVendor) &&
+        command_line.GetSwitchValueASCII(switches::kGpuDriverVendor) ==
+            "Mesa") {
+      base::FilePath swrast_lib(DRI_DRIVER_DIR);
+      swrast_lib = swrast_lib.Append("swrast_dri.so");
+      driver_libraries.push_back(swrast_lib.value());
+    }
+#endif
+
+    for (const auto& lib_name : driver_libraries) {
+      void* dl =
+          dlopen(lib_name.c_str(), RTLD_NOW | RTLD_GLOBAL | RTLD_NODELETE);
+      if (!dl)
+        LOG(ERROR) << "Failed to open " << lib_name << " with error "
+                   << dlerror();
+    }
+  }
+
   return true;
 }