84 lines
3.6 KiB
Diff
84 lines
3.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Jeremy Apthorp <nornagon@nornagon.net>
|
|
Date: Wed, 28 Nov 2018 13:20:27 -0800
|
|
Subject: support_mixed_sandbox_with_zygote.patch
|
|
|
|
On Linux, Chromium launches all new renderer processes via a "zygote"
|
|
process which has the sandbox pre-initialized (see
|
|
//docs/linux_zygote.md). In order to support mixed-sandbox mode, in
|
|
which some renderers are launched with the sandbox engaged and others
|
|
without it, we need the option to launch non-sandboxed renderers without
|
|
going through the zygote.
|
|
|
|
Chromium already supports a `--no-zygote` flag, but it turns off the
|
|
zygote completely, and thus also disables sandboxing. This patch allows
|
|
the `--no-zygote` flag to affect renderer processes on a case-by-case
|
|
basis, checking immediately prior to launch whether to go through the
|
|
zygote or not based on the command-line of the to-be-launched renderer.
|
|
|
|
This patch could conceivably be upstreamed, as it does not affect
|
|
production Chromium (which does not use the `--no-zygote` flag).
|
|
However, the patch would need to be reviewed by the security team, as it
|
|
does touch a security-sensitive class.
|
|
|
|
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
|
|
index 7c4043ded7f1876c74b2d62b10b3ff66441c7cd8..6e3fd9b9fc420dc55951b9e3405dacf97f350369 100644
|
|
--- a/content/browser/renderer_host/render_process_host_impl.cc
|
|
+++ b/content/browser/renderer_host/render_process_host_impl.cc
|
|
@@ -427,10 +427,18 @@ class RendererSandboxedProcessLauncherDelegate
|
|
public:
|
|
RendererSandboxedProcessLauncherDelegate() = default;
|
|
|
|
+#if BUILDFLAG(USE_ZYGOTE_HANDLE)
|
|
+ RendererSandboxedProcessLauncherDelegate(bool use_zygote):
|
|
+ use_zygote_(use_zygote) {}
|
|
+#endif
|
|
+
|
|
~RendererSandboxedProcessLauncherDelegate() override = default;
|
|
|
|
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
|
|
ZygoteHandle GetZygote() override {
|
|
+ if (!use_zygote_) {
|
|
+ return nullptr;
|
|
+ }
|
|
const base::CommandLine& browser_command_line =
|
|
*base::CommandLine::ForCurrentProcess();
|
|
base::CommandLine::StringType renderer_prefix =
|
|
@@ -448,6 +456,11 @@ class RendererSandboxedProcessLauncherDelegate
|
|
sandbox::policy::SandboxType GetSandboxType() override {
|
|
return sandbox::policy::SandboxType::kRenderer;
|
|
}
|
|
+
|
|
+ private:
|
|
+#if BUILDFLAG(USE_ZYGOTE_HANDLE)
|
|
+ bool use_zygote_ = true;
|
|
+#endif
|
|
};
|
|
|
|
#if defined(OS_WIN)
|
|
@@ -459,6 +472,9 @@ class RendererSandboxedProcessLauncherDelegateWin
|
|
bool is_jit_disabled)
|
|
: renderer_code_integrity_enabled_(
|
|
GetContentClient()->browser()->IsRendererCodeIntegrityEnabled()) {
|
|
+#if BUILDFLAG(USE_ZYGOTE_HANDLE)
|
|
+ use_zygote_ = !cmd_line->HasSwitch(switches::kNoZygote);
|
|
+#endif
|
|
if (is_jit_disabled) {
|
|
dynamic_code_can_be_disabled_ = true;
|
|
return;
|
|
@@ -2009,9 +2025,15 @@ bool RenderProcessHostImpl::Init() {
|
|
std::unique_ptr<SandboxedProcessLauncherDelegate> sandbox_delegate =
|
|
std::make_unique<RendererSandboxedProcessLauncherDelegateWin>(
|
|
cmd_line.get(), IsJitDisabled());
|
|
+#else
|
|
+#if BUILDFLAG(USE_ZYGOTE_HANDLE)
|
|
+ bool use_zygote = !cmd_line->HasSwitch(switches::kNoZygote);
|
|
+ std::unique_ptr<SandboxedProcessLauncherDelegate> sandbox_delegate =
|
|
+ std::make_unique<RendererSandboxedProcessLauncherDelegate>(use_zygote);
|
|
#else
|
|
std::unique_ptr<SandboxedProcessLauncherDelegate> sandbox_delegate =
|
|
std::make_unique<RendererSandboxedProcessLauncherDelegate>();
|
|
+#endif
|
|
#endif
|
|
// Spawn the child process asynchronously to avoid blocking the UI thread.
|
|
// As long as there's no renderer prefix, we can use the zygote process
|