mirror of https://github.com/electron/electron
91 lines
4.3 KiB
Diff
91 lines
4.3 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 5a3d3b63c73408cc4a5663fb6eb25da38843f482..1993f5f899b7959f1c3292b0f0d7041b2e541484 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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@@ -1758,6 +1758,10 @@ bool RenderProcessHostImpl::Init() {
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std::unique_ptr<SandboxedProcessLauncherDelegate> sandbox_delegate =
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std::make_unique<RendererSandboxedProcessLauncherDelegateWin>(
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*cmd_line, IsPdf(), IsJitDisabled());
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+#elif BUILDFLAG(USE_ZYGOTE)
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+ bool use_zygote = !cmd_line->HasSwitch(switches::kNoZygote);
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+ std::unique_ptr<SandboxedProcessLauncherDelegate> sandbox_delegate =
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+ std::make_unique<RendererSandboxedProcessLauncherDelegate>(use_zygote);
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#else
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std::unique_ptr<SandboxedProcessLauncherDelegate> sandbox_delegate =
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std::make_unique<RendererSandboxedProcessLauncherDelegate>();
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diff --git a/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.cc b/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.cc
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index 9f66bec84f6284d3f20e59342d3e0a7b2917f836..affaca4776178365fe5d3024d2f733c01da07e09 100644
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--- a/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.cc
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+++ b/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.cc
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@@ -35,6 +35,9 @@ namespace content {
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#if BUILDFLAG(USE_ZYGOTE)
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ZygoteCommunication* RendererSandboxedProcessLauncherDelegate::GetZygote() {
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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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@@ -70,6 +73,9 @@ RendererSandboxedProcessLauncherDelegateWin::
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is_pdf_renderer_(is_pdf_renderer) {
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// PDF renderers must be jitless.
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CHECK(!is_pdf_renderer || is_jit_disabled);
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+#if BUILDFLAG(USE_ZYGOTE)
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+ use_zygote_ = !cmd_line->HasSwitch(switches::kNoZygote);
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+#endif
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if (is_jit_disabled) {
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dynamic_code_can_be_disabled_ = true;
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return;
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diff --git a/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.h b/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.h
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index e77326f149febfb1e236f221757fe24b989e01c0..4f621d8c36706557151560b2a6e0821a46f39c7f 100644
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--- a/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.h
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+++ b/content/browser/renderer_host/renderer_sandboxed_process_launcher_delegate.h
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@@ -18,6 +18,11 @@ class CONTENT_EXPORT RendererSandboxedProcessLauncherDelegate
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public:
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RendererSandboxedProcessLauncherDelegate() = default;
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+#if BUILDFLAG(USE_ZYGOTE)
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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 BUILDFLAG(USE_ZYGOTE)
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@@ -30,6 +35,11 @@ class CONTENT_EXPORT RendererSandboxedProcessLauncherDelegate
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// sandbox::policy::SandboxDelegate:
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sandbox::mojom::Sandbox GetSandboxType() override;
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+
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+ private:
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+#if BUILDFLAG(USE_ZYGOTE)
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+ bool use_zygote_ = true;
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+#endif
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};
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#if BUILDFLAG(IS_WIN)
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