84 lines
3.5 KiB
Diff
84 lines
3.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jeremy Apthorp <nornagon@nornagon.net>
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Date: Wed, 28 Nov 2018 13:20:27 -0800
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Subject: support_mixed_sandbox_with_zygote.patch
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On Linux, Chromium launches all new renderer processes via a "zygote"
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process which has the sandbox pre-initialized (see
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//docs/linux_zygote.md). In order to support mixed-sandbox mode, in
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which some renderers are launched with the sandbox engaged and others
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without it, we need the option to launch non-sandboxed renderers without
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going through the zygote.
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Chromium already supports a `--no-zygote` flag, but it turns off the
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zygote completely, and thus also disables sandboxing. This patch allows
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the `--no-zygote` flag to affect renderer processes on a case-by-case
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basis, checking immediately prior to launch whether to go through the
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zygote or not based on the command-line of the to-be-launched renderer.
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This patch could conceivably be upstreamed, as it does not affect
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production Chromium (which does not use the `--no-zygote` flag).
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However, the patch would need to be reviewed by the security team, as it
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does touch a security-sensitive class.
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diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
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index 7662384242619d32f5133757674fddae40615873..3da3babcc13efc598faf17a4349dae73b908c380 100644
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--- a/content/browser/renderer_host/render_process_host_impl.cc
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+++ b/content/browser/renderer_host/render_process_host_impl.cc
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@@ -401,6 +401,11 @@ class RendererSandboxedProcessLauncherDelegate
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{
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}
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+#if BUILDFLAG(USE_ZYGOTE_HANDLE)
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+ RendererSandboxedProcessLauncherDelegate(bool use_zygote):
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+ use_zygote_(use_zygote) {}
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+#endif
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+
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~RendererSandboxedProcessLauncherDelegate() override = default;
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#if defined(OS_WIN)
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@@ -422,6 +427,9 @@ class RendererSandboxedProcessLauncherDelegate
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#if BUILDFLAG(USE_ZYGOTE_HANDLE)
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ZygoteHandle GetZygote() override {
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+ if (!use_zygote_) {
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+ return nullptr;
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+ }
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const base::CommandLine& browser_command_line =
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*base::CommandLine::ForCurrentProcess();
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base::CommandLine::StringType renderer_prefix =
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@@ -436,10 +444,13 @@ class RendererSandboxedProcessLauncherDelegate
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return sandbox::policy::SandboxType::kRenderer;
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}
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-#if defined(OS_WIN)
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private:
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+#if defined(OS_WIN)
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const bool renderer_code_integrity_enabled_;
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#endif
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+#if BUILDFLAG(USE_ZYGOTE_HANDLE)
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+ bool use_zygote_ = true;
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+#endif
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};
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const char kSessionStorageHolderKey[] = "kSessionStorageHolderKey";
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@@ -1816,11 +1827,18 @@ bool RenderProcessHostImpl::Init() {
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cmd_line->PrependWrapper(renderer_prefix);
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AppendRendererCommandLine(cmd_line.get());
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+#if BUILDFLAG(USE_ZYGOTE_HANDLE)
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+ bool use_zygote = !cmd_line->HasSwitch(switches::kNoZygote);
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+ auto delegate = std::make_unique<RendererSandboxedProcessLauncherDelegate>(use_zygote);
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+#else
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+ auto delegate = std::make_unique<RendererSandboxedProcessLauncherDelegate>();
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+#endif
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+
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// Spawn the child process asynchronously to avoid blocking the UI thread.
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// As long as there's no renderer prefix, we can use the zygote process
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// at this stage.
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child_process_launcher_ = std::make_unique<ChildProcessLauncher>(
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- std::make_unique<RendererSandboxedProcessLauncherDelegate>(),
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+ std::move(delegate),
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std::move(cmd_line), GetID(), this, std::move(mojo_invitation_),
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base::BindRepeating(&RenderProcessHostImpl::OnMojoError, id_),
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GetV8SnapshotFilesToPreload());
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