Sync with 2.39.4

* maint-2.39: (38 commits)
  Git 2.39.4
  fsck: warn about symlink pointing inside a gitdir
  core.hooksPath: add some protection while cloning
  init.templateDir: consider this config setting protected
  clone: prevent hooks from running during a clone
  Add a helper function to compare file contents
  init: refactor the template directory discovery into its own function
  find_hook(): refactor the `STRIP_EXTENSION` logic
  clone: when symbolic links collide with directories, keep the latter
  entry: report more colliding paths
  t5510: verify that D/F confusion cannot lead to an RCE
  submodule: require the submodule path to contain directories only
  clone_submodule: avoid using `access()` on directories
  submodules: submodule paths must not contain symlinks
  clone: prevent clashing git dirs when cloning submodule in parallel
  t7423: add tests for symlinked submodule directories
  has_dir_name(): do not get confused by characters < '/'
  docs: document security issues around untrusted .git dirs
  upload-pack: disable lazy-fetching by default
  fetch/clone: detect dubious ownership of local repositories
  ...

1 files changed, 15 insertions, 1 deletions

diff --git a/entry.c b/entry.c
index 971ab26871..9e7dbe33d5 100644
--- a/entry.c
+++ b/entry.c
@@ -454,7 +454,7 @@ static void mark_colliding_entries(const struct checkout *state,
 			continue;
 
 		if ((trust_ino && !match_stat_data(&dup->ce_stat_data, st)) ||
-		    (!trust_ino && !fspathcmp(ce->name, dup->name))) {
+		    paths_collide(ce->name, dup->name)) {
 			dup->ce_flags |= CE_MATCHED;
 			break;
 		}
@@ -541,6 +541,20 @@ int checkout_entry_ca(struct cache_entry *ce, struct conv_attrs *ca,
 			/* If it is a gitlink, leave it alone! */
 			if (S_ISGITLINK(ce->ce_mode))
 				return 0;
+			/*
+			 * We must avoid replacing submodules' leading
+			 * directories with symbolic links, lest recursive
+			 * clones can write into arbitrary locations.
+			 *
+			 * Technically, this logic is not limited
+			 * to recursive clones, or for that matter to
+			 * submodules' paths colliding with symbolic links'
+			 * paths. Yet it strikes a balance in favor of
+			 * simplicity, and if paths are colliding, we might
+			 * just as well keep the directories during a clone.
+			 */
+			if (state->clone && S_ISLNK(ce->ce_mode))
+				return 0;
 			remove_subtree(&path);
 		} else if (unlink(path.buf))
 			return error_errno("unable to unlink old '%s'", path.buf);