fix_crash_loading_non-standard_schemes_in_iframes.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Mon, 29 Aug 2022 11:44:57 +0200
Subject: fix: crash loading non-standard schemes in iframes

This fixes a crash that occurs when loading non-standard schemes from
iframes or webviews. This was happening because
ChildProcessSecurityPolicyImpl::CanAccessDataForOrigin contains explicit
exceptions to allow built-in non-standard schemes, but does not check
for non-standard schemes registered by the embedder.

Upstream, https://bugs.chromium.org/p/chromium/issues/detail?id=1081397
contains several paths forward - here I chose to swap out the
CHECK in navigation_request.cc from policy->CanAccessDataForOrigin to
policy->CanCommitOriginAndUrl.

This, or a version of it, will be upstreamed.

diff --git a/content/browser/renderer_host/navigation_request.cc b/content/browser/renderer_host/navigation_request.cc
index b1120c9270a255e4b6070c0d2b5f49e6f99d935d..407888cb17d3e609ad7aaa2ed1c079642df60bca 100644
--- a/content/browser/renderer_host/navigation_request.cc
+++ b/content/browser/renderer_host/navigation_request.cc
@@ -6517,10 +6517,11 @@ std::pair<url::Origin, std::string> NavigationRequest::
   if (IsForMhtmlSubframe())
     return origin_with_debug_info;
 
-  int process_id = GetRenderFrameHost()->GetProcess()->GetID();
-  auto* policy = ChildProcessSecurityPolicyImpl::GetInstance();
-  CHECK(
-      policy->CanAccessDataForOrigin(process_id, origin_with_debug_info.first));
+  CanCommitStatus can_commit = GetRenderFrameHost()->CanCommitOriginAndUrl(
+    origin_with_debug_info.first, GetURL(), IsSameDocument(), IsPdf(),
+    GetUrlInfo().is_sandboxed);
+  CHECK_EQ(CanCommitStatus::CAN_COMMIT_ORIGIN_AND_URL, can_commit);
+
   return origin_with_debug_info;
 }
 
diff --git a/content/browser/renderer_host/render_frame_host_impl.h b/content/browser/renderer_host/render_frame_host_impl.h
index b1259618ff4dc1848cf007d853e6f3e70b08829f..3d4e6c4c7e0348c52c3f0ccd0f6c19e0e1ec15a5 100644
--- a/content/browser/renderer_host/render_frame_host_impl.h
+++ b/content/browser/renderer_host/render_frame_host_impl.h
@@ -2550,6 +2550,17 @@ class CONTENT_EXPORT RenderFrameHostImpl
     HandleAXEvents(tree_id, std::move(updates_and_events), reset_token);
   }
 
+  // Returns whether the given origin and URL is allowed to commit in the
+  // current RenderFrameHost. The |url| is used to ensure it matches the origin
+  // in cases where it is applicable. This is a more conservative check than
+  // RenderProcessHost::FilterURL, since it will be used to kill processes that
+  // commit unauthorized origins.
+  CanCommitStatus CanCommitOriginAndUrl(const url::Origin& origin,
+                                        const GURL& url,
+                                        bool is_same_document_navigation,
+                                        bool is_pdf,
+                                        bool is_sandboxed);
+
  protected:
   friend class RenderFrameHostFactory;
 
@@ -2879,17 +2890,6 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // relevant.
   void ResetWaitingState();
 
-  // Returns whether the given origin and URL is allowed to commit in the
-  // current RenderFrameHost. The |url| is used to ensure it matches the origin
-  // in cases where it is applicable. This is a more conservative check than
-  // RenderProcessHost::FilterURL, since it will be used to kill processes that
-  // commit unauthorized origins.
-  CanCommitStatus CanCommitOriginAndUrl(const url::Origin& origin,
-                                        const GURL& url,
-                                        bool is_same_document_navigation,
-                                        bool is_pdf,
-                                        bool is_sandboxed);
-
   // Returns whether a subframe navigation request should be allowed to commit
   // to the current RenderFrameHost.
   bool CanSubframeCommitOriginAndUrl(NavigationRequest* navigation_request);