Git 2.38.1

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Sync with v2.38.1

Documentation/RelNotes/2.30.6.txt

@@ -0,0 +1,60 @@
+Git v2.30.6 Release Notes
+=========================
+
+This release addresses the security issues CVE-2022-39253 and
+CVE-2022-39260.
+
+Fixes since v2.30.5
+-------------------
+
+ * CVE-2022-39253:
+   When relying on the `--local` clone optimization, Git dereferences
+   symbolic links in the source repository before creating hardlinks
+   (or copies) of the dereferenced link in the destination repository.
+   This can lead to surprising behavior where arbitrary files are
+   present in a repository's `$GIT_DIR` when cloning from a malicious
+   repository.
+
+   Git will no longer dereference symbolic links via the `--local`
+   clone mechanism, and will instead refuse to clone repositories that
+   have symbolic links present in the `$GIT_DIR/objects` directory.
+
+   Additionally, the value of `protocol.file.allow` is changed to be
+   "user" by default.
+
+ * CVE-2022-39260:
+   An overly-long command string given to `git shell` can result in
+   overflow in `split_cmdline()`, leading to arbitrary heap writes and
+   remote code execution when `git shell` is exposed and the directory
+   `$HOME/git-shell-commands` exists.
+
+   `git shell` is taught to refuse interactive commands that are
+   longer than 4MiB in size. `split_cmdline()` is hardened to reject
+   inputs larger than 2GiB.
+
+Credit for finding CVE-2022-39253 goes to Cory Snider of Mirantis. The
+fix was authored by Taylor Blau, with help from Johannes Schindelin.
+
+Credit for finding CVE-2022-39260 goes to Kevin Backhouse of GitHub.
+The fix was authored by Kevin Backhouse, Jeff King, and Taylor Blau.
+
+
+Jeff King (2):
+      shell: add basic tests
+      shell: limit size of interactive commands
+
+Kevin Backhouse (1):
+      alias.c: reject too-long cmdline strings in split_cmdline()
+
+Taylor Blau (11):
+      builtin/clone.c: disallow `--local` clones with symlinks
+      t/lib-submodule-update.sh: allow local submodules
+      t/t1NNN: allow local submodules
+      t/2NNNN: allow local submodules
+      t/t3NNN: allow local submodules
+      t/t4NNN: allow local submodules
+      t/t5NNN: allow local submodules
+      t/t6NNN: allow local submodules
+      t/t7NNN: allow local submodules
+      t/t9NNN: allow local submodules
+      transport: make `protocol.file.allow` be "user" by default

Documentation/RelNotes/2.31.5.txt

@@ -0,0 +1,5 @@
+Git v2.31.5 Release Notes
+=========================
+
+This release merges the security fix that appears in v2.30.6; see
+the release notes for that version for details.

Documentation/RelNotes/2.32.4.txt

@@ -0,0 +1,5 @@
+Git v2.32.4 Release Notes
+=========================
+
+This release merges the security fix that appears in v2.30.6; see
+the release notes for that version for details.

Documentation/RelNotes/2.33.5.txt

@@ -0,0 +1,5 @@
+Git v2.33.5 Release Notes
+=========================
+
+This release merges the security fix that appears in v2.30.6; see
+the release notes for that version for details.

Documentation/RelNotes/2.34.5.txt

@@ -0,0 +1,5 @@
+Git v2.34.5 Release Notes
+=========================
+
+This release merges the security fix that appears in v2.30.6; see
+the release notes for that version for details.

Documentation/RelNotes/2.35.5.txt

@@ -0,0 +1,5 @@
+Git v2.35.5 Release Notes
+=========================
+
+This release merges the security fix that appears in v2.30.6; see
+the release notes for that version for details.

Documentation/RelNotes/2.36.3.txt

@@ -0,0 +1,5 @@
+Git v2.36.3 Release Notes
+=========================
+
+This release merges the security fix that appears in v2.30.6; see
+the release notes for that version for details.

Documentation/RelNotes/2.37.4.txt

@@ -2,11 +2,45 @@ Git 2.37.4 Release Notes
 ========================
 
 This primarily is to backport various fixes accumulated on the 'master'
-front since 2.37.3.
+front since 2.37.3, and also includes the same security fixes as in
+v2.30.6.
 
 Fixes since v2.37.3
 -------------------
 
+ * CVE-2022-39253:
+   When relying on the `--local` clone optimization, Git dereferences
+   symbolic links in the source repository before creating hardlinks
+   (or copies) of the dereferenced link in the destination repository.
+   This can lead to surprising behavior where arbitrary files are
+   present in a repository's `$GIT_DIR` when cloning from a malicious
+   repository.
+
+   Git will no longer dereference symbolic links via the `--local`
+   clone mechanism, and will instead refuse to clone repositories that
+   have symbolic links present in the `$GIT_DIR/objects` directory.
+
+   Additionally, the value of `protocol.file.allow` is changed to be
+   "user" by default.
+
+   Credit for finding CVE-2022-39253 goes to Cory Snider of Mirantis.
+   The fix was authored by Taylor Blau, with help from Johannes
+   Schindelin.
+
+ * CVE-2022-39260:
+   An overly-long command string given to `git shell` can result in
+   overflow in `split_cmdline()`, leading to arbitrary heap writes and
+   remote code execution when `git shell` is exposed and the directory
+   `$HOME/git-shell-commands` exists.
+
+   `git shell` is taught to refuse interactive commands that are
+   longer than 4MiB in size. `split_cmdline()` is hardened to reject
+   inputs larger than 2GiB.
+
+   Credit for finding CVE-2022-39260 goes to Kevin Backhouse of
+   GitHub. The fix was authored by Kevin Backhouse, Jeff King, and
+   Taylor Blau.
+
  * An earlier optimization discarded a tree-object buffer that is
    still in use, which has been corrected.
 

Documentation/RelNotes/2.38.1.txt

@@ -0,0 +1,5 @@
+Git v2.38.1 Release Notes
+=========================
+
+This release merges the security fix that appears in v2.30.6; see
+the release notes for that version for details.

Documentation/config/protocol.txt

@@ -1,10 +1,10 @@
 protocol.allow::
 	If set, provide a user defined default policy for all protocols which
 	don't explicitly have a policy (`protocol.<name>.allow`).  By default,
-	if unset, known-safe protocols (http, https, git, ssh, file) have a
+	if unset, known-safe protocols (http, https, git, ssh) have a
 	default policy of `always`, known-dangerous protocols (ext) have a
-	default policy of `never`, and all other protocols have a default
-	policy of `user`.  Supported policies:
+	default policy of `never`, and all other protocols (including file)
+	have a default policy of `user`.  Supported policies:
 +
 --
 

alias.c

@@ -46,14 +46,16 @@ void list_aliases(struct string_list *list)
 
 #define SPLIT_CMDLINE_BAD_ENDING 1
 #define SPLIT_CMDLINE_UNCLOSED_QUOTE 2
+#define SPLIT_CMDLINE_ARGC_OVERFLOW 3
 static const char *split_cmdline_errors[] = {
 	N_("cmdline ends with \\"),
-	N_("unclosed quote")
+	N_("unclosed quote"),
+	N_("too many arguments"),
 };
 
 int split_cmdline(char *cmdline, const char ***argv)
 {
-	int src, dst, count = 0, size = 16;
+	size_t src, dst, count = 0, size = 16;
 	char quoted = 0;
 
 	ALLOC_ARRAY(*argv, size);
@@ -96,6 +98,11 @@ int split_cmdline(char *cmdline, const char ***argv)
 		return -SPLIT_CMDLINE_UNCLOSED_QUOTE;
 	}
 
+	if (count >= INT_MAX) {
+		FREE_AND_NULL(*argv);
+		return -SPLIT_CMDLINE_ARGC_OVERFLOW;
+	}
+
 	ALLOC_GROW(*argv, count + 1, size);
 	(*argv)[count] = NULL;
 

builtin/clone.c

@@ -320,13 +320,11 @@ static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 	int src_len, dest_len;
 	struct dir_iterator *iter;
 	int iter_status;
-	unsigned int flags;
 	struct strbuf realpath = STRBUF_INIT;
 
 	mkdir_if_missing(dest->buf, 0777);
 
-	flags = DIR_ITERATOR_PEDANTIC | DIR_ITERATOR_FOLLOW_SYMLINKS;
-	iter = dir_iterator_begin(src->buf, flags);
+	iter = dir_iterator_begin(src->buf, DIR_ITERATOR_PEDANTIC);
 
 	if (!iter)
 		die_errno(_("failed to start iterator over '%s'"), src->buf);
@@ -342,6 +340,10 @@ static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 		strbuf_setlen(dest, dest_len);
 		strbuf_addstr(dest, iter->relative_path);
 
+		if (S_ISLNK(iter->st.st_mode))
+			die(_("symlink '%s' exists, refusing to clone with --local"),
+			    iter->relative_path);
+
 		if (S_ISDIR(iter->st.st_mode)) {
 			mkdir_if_missing(dest->buf, 0777);
 			continue;

shell.c

@@ -47,6 +47,8 @@ static void cd_to_homedir(void)
 		die("could not chdir to user's home directory");
 }
 
+#define MAX_INTERACTIVE_COMMAND (4*1024*1024)
+
 static void run_shell(void)
 {
 	int done = 0;
@@ -67,22 +69,46 @@ static void run_shell(void)
 	run_command_v_opt(help_argv, RUN_SILENT_EXEC_FAILURE);
 
 	do {
-		struct strbuf line = STRBUF_INIT;
 		const char *prog;
 		char *full_cmd;
 		char *rawargs;
+		size_t len;
 		char *split_args;
 		const char **argv;
 		int code;
 		int count;
 
 		fprintf(stderr, "git> ");
-		if (git_read_line_interactively(&line) == EOF) {
+
+		/*
+		 * Avoid using a strbuf or git_read_line_interactively() here.
+		 * We don't want to allocate arbitrary amounts of memory on
+		 * behalf of a possibly untrusted client, and we're subject to
+		 * OS limits on command length anyway.
+		 */
+		fflush(stdout);
+		rawargs = xmalloc(MAX_INTERACTIVE_COMMAND);
+		if (!fgets(rawargs, MAX_INTERACTIVE_COMMAND, stdin)) {
 			fprintf(stderr, "\n");
-			strbuf_release(&line);
+			free(rawargs);
 			break;
 		}
-		rawargs = strbuf_detach(&line, NULL);
+		len = strlen(rawargs);
+
+		/*
+		 * If we truncated due to our input buffer size, reject the
+		 * command. That's better than running bogus input, and
+		 * there's a good chance it's just malicious garbage anyway.
+		 */
+		if (len >= MAX_INTERACTIVE_COMMAND - 1)
+			die("invalid command format: input too long");
+
+		if (len > 0 && rawargs[len - 1] == '\n') {
+			if (--len > 0 && rawargs[len - 1] == '\r')
+				--len;
+			rawargs[len] = '\0';
+		}
+
 		split_args = xstrdup(rawargs);
 		count = split_cmdline(split_args, &argv);
 		if (count < 0) {

t/lib-submodule-update.sh

@@ -197,6 +197,7 @@ test_git_directory_exists () {
 # the submodule repo if it doesn't exist and configures the most problematic
 # settings for diff.ignoreSubmodules.
 prolog () {
+	test_config_global protocol.file.allow always &&
 	(test -d submodule_update_repo || create_lib_submodule_repo) &&
 	test_config_global diff.ignoreSubmodules all &&
 	test_config diff.ignoreSubmodules all

t/t1091-sparse-checkout-builtin.sh

@@ -560,7 +560,8 @@ test_expect_success 'interaction with submodules' '
 	(
 		cd super &&
 		mkdir modules &&
-		git submodule add ../repo modules/child &&
+		git -c protocol.file.allow=always \
+			submodule add ../repo modules/child &&
 		git add . &&
 		git commit -m "add submodule" &&
 		git sparse-checkout init --cone &&

t/t1092-sparse-checkout-compatibility.sh

@@ -1315,6 +1315,8 @@ test_expect_success 'submodule handling' '
 	test_all_match git add modules &&
 	test_all_match git commit -m "add modules directory" &&
 
+	test_config_global protocol.file.allow always &&
+
 	run_on_all git submodule add "$(pwd)/initial-repo" modules/sub &&
 	test_all_match git commit -m "add submodule" &&
 

t/t1500-rev-parse.sh

@@ -226,7 +226,8 @@ test_expect_success 'showing the superproject correctly' '
 	test_commit -C super test_commit &&
 	test_create_repo sub &&
 	test_commit -C sub test_commit &&
-	git -C super submodule add ../sub dir/sub &&
+	git -c protocol.file.allow=always \
+		-C super submodule add ../sub dir/sub &&
 	echo $(pwd)/super >expect  &&
 	git -C super/dir/sub rev-parse --show-superproject-working-tree >out &&
 	test_cmp expect out &&

t/t2080-parallel-checkout-basics.sh

@@ -41,6 +41,8 @@ TEST_NO_CREATE_REPO=1
 #  -                  m/m (file)
 #
 test_expect_success 'setup repo for checkout with various types of changes' '
+	test_config_global protocol.file.allow always &&
+
 	git init sub &&
 	(
 		cd sub &&
@@ -140,6 +142,7 @@ do
 	esac
 
 	test_expect_success "$mode checkout on clone" '
+		test_config_global protocol.file.allow always &&
 		repo=various_${mode}_clone &&
 		set_checkout_config $workers $threshold &&
 		test_checkout_workers $expected_workers \

t/t2400-worktree-add.sh

@@ -669,6 +669,7 @@ test_expect_success '"add" should not fail because of another bad worktree' '
 '
 
 test_expect_success '"add" with uninitialized submodule, with submodule.recurse unset' '
+	test_config_global protocol.file.allow always &&
 	test_create_repo submodule &&
 	test_commit -C submodule first &&
 	test_create_repo project &&
@@ -684,6 +685,7 @@ test_expect_success '"add" with uninitialized submodule, with submodule.recurse
 '
 
 test_expect_success '"add" with initialized submodule, with submodule.recurse unset' '
+	test_config_global protocol.file.allow always &&
 	git -C project-clone submodule update --init &&
 	git -C project-clone worktree add ../project-4
 '

t/t2403-worktree-move.sh

@@ -139,7 +139,8 @@ test_expect_success 'move a repo with uninitialized submodule' '
 	(
 		cd withsub &&
 		test_commit initial &&
-		git submodule add "$PWD"/.git sub &&
+		git -c protocol.file.allow=always \
+			submodule add "$PWD"/.git sub &&
 		git commit -m withsub &&
 		git worktree add second HEAD &&
 		git worktree move second third
@@ -149,7 +150,7 @@ test_expect_success 'move a repo with uninitialized submodule' '
 test_expect_success 'not move a repo with initialized submodule' '
 	(
 		cd withsub &&
-		git -C third submodule update &&
+		git -c protocol.file.allow=always -C third submodule update &&
 		test_must_fail git worktree move third forth
 	)
 '
@@ -228,6 +229,7 @@ test_expect_success 'remove cleans up .git/worktrees when empty' '
 '
 
 test_expect_success 'remove a repo with uninitialized submodule' '
+	test_config_global protocol.file.allow always &&
 	(
 		cd withsub &&
 		git worktree add to-remove HEAD &&
@@ -236,6 +238,7 @@ test_expect_success 'remove a repo with uninitialized submodule' '
 '
 
 test_expect_success 'not remove a repo with initialized submodule' '
+	test_config_global protocol.file.allow always &&
 	(
 		cd withsub &&
 		git worktree add to-remove HEAD &&

t/t2405-worktree-submodule.sh

@@ -10,6 +10,7 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 base_path=$(pwd -P)
 
 test_expect_success 'setup: create origin repos'  '
+	git config --global protocol.file.allow always &&
 	git init origin/sub &&
 	test_commit -C origin/sub file1 &&
 	git init origin/main &&

t/t3200-branch.sh

@@ -306,6 +306,7 @@ test_expect_success 'deleting checked-out branch from repo that is a submodule'
 	git init repo1 &&
 	git init repo1/sub &&
 	test_commit -C repo1/sub x &&
+	test_config_global protocol.file.allow always &&
 	git -C repo1 submodule add ./sub &&
 	git -C repo1 commit -m "adding sub" &&
 

t/t3206-range-diff.sh

@@ -793,7 +793,7 @@ test_expect_success 'submodule changes are shown irrespective of diff.submodule'
 	sub_oid3=$(git -C sub-repo rev-parse HEAD) &&
 
 	git checkout -b main-sub topic &&
-	git submodule add ./sub-repo sub &&
+	git -c protocol.file.allow=always submodule add ./sub-repo sub &&
 	git -C sub checkout --detach sub-first &&
 	git commit -m "add sub" sub &&
 	sup_oid1=$(git rev-parse --short HEAD) &&

t/t3207-branch-submodule.sh

@@ -28,6 +28,7 @@ test_no_branch () {
 }
 
 test_expect_success 'setup superproject and submodule' '
+	git config --global protocol.file.allow always &&
 	mkdir test_dirs &&
 	(
 		cd test_dirs &&

t/t3420-rebase-autostash.sh

@@ -310,7 +310,7 @@ test_expect_success 'autostash is saved on editor failure with conflict' '
 test_expect_success 'autostash with dirty submodules' '
 	test_when_finished "git reset --hard && git checkout main" &&
 	git checkout -b with-submodule &&
-	git submodule add ./ sub &&
+	git -c protocol.file.allow=always submodule add ./ sub &&
 	test_tick &&
 	git commit -m add-submodule &&
 	echo changed >sub/file0 &&

t/t3426-rebase-submodule.sh

@@ -48,7 +48,8 @@ test_expect_success 'rebase interactive ignores modified submodules' '
 	git init sub &&
 	git -C sub commit --allow-empty -m "Initial commit" &&
 	git init super &&
-	git -C super submodule add ../sub &&
+	git -c protocol.file.allow=always \
+		-C super submodule add ../sub &&
 	git -C super config submodule.sub.ignore dirty &&
 	>super/foo &&
 	git -C super add foo &&

t/t3512-cherry-pick-submodule.sh

@@ -16,6 +16,8 @@ fi
 test_submodule_switch "cherry-pick"
 
 test_expect_success 'unrelated submodule/file conflict is ignored' '
+	test_config_global protocol.file.allow always &&
+
 	test_create_repo sub &&
 
 	touch sub/file &&

t/t3600-rm.sh

@@ -333,7 +333,7 @@ test_expect_success 'rm removes empty submodules from work tree' '
 
 test_expect_success 'rm removes removed submodule from index and .gitmodules' '
 	git reset --hard &&
-	git submodule update &&
+	git -c protocol.file.allow=always submodule update &&
 	rm -rf submod &&
 	git rm submod &&
 	git status -s -uno --ignore-submodules=none >actual &&
@@ -639,6 +639,7 @@ cat >expect.deepmodified <<EOF
 EOF
 
 test_expect_success 'setup subsubmodule' '
+	test_config_global protocol.file.allow always &&
 	git reset --hard &&
 	git submodule update &&
 	(

t/t3906-stash-submodule.sh

@@ -36,7 +36,7 @@ setup_basic () {
 	git init main &&
 	(
 		cd main &&
-		git submodule add ../sub &&
+		git -c protocol.file.allow=always submodule add ../sub &&
 		test_commit main_file
 	)
 }

t/t4059-diff-submodule-not-initialized.sh

@@ -49,7 +49,7 @@ test_expect_success 'setup - submodules' '
 '
 
 test_expect_success 'setup - git submodule add' '
-	git submodule add ./sm2 sm1 &&
+	git -c protocol.file.allow=always submodule add ./sm2 sm1 &&
 	commit_file sm1 .gitmodules &&
 	git diff-tree -p --no-commit-id --submodule=log HEAD -- sm1 >actual &&
 	cat >expected <<-EOF &&

t/t4060-diff-submodule-option-diff-format.sh

@@ -840,7 +840,7 @@ rm sm2
 mv sm2-bak sm2
 
 test_expect_success 'setup nested submodule' '
-	git -C sm2 submodule add ../sm2 nested &&
+	git -c protocol.file.allow=always -C sm2 submodule add ../sm2 nested &&
 	git -C sm2 commit -a -m "nested sub" &&
 	head10=$(git -C sm2 rev-parse --short --verify HEAD)
 '

t/t4067-diff-partial-clone.sh

@@ -77,6 +77,7 @@ test_expect_success 'diff skips same-OID blobs' '
 
 test_expect_success 'when fetching missing objects, diff skips GITLINKs' '
 	test_when_finished "rm -rf sub server client trace" &&
+	test_config_global protocol.file.allow always &&
 
 	test_create_repo sub &&
 	test_commit -C sub first &&

t/t4208-log-magic-pathspec.sh

@@ -124,6 +124,7 @@ test_expect_success 'command line pathspec parsing for "git log"' '
 
 test_expect_success 'tree_entry_interesting does not match past submodule boundaries' '
 	test_when_finished "rm -rf repo submodule" &&
+	test_config_global protocol.file.allow always &&
 	git init submodule &&
 	test_commit -C submodule initial &&
 	git init repo &&

t/t5510-fetch.sh

@@ -790,6 +790,7 @@ test_expect_success 'fetch.writeCommitGraph' '
 '
 
 test_expect_success 'fetch.writeCommitGraph with submodules' '
+	test_config_global protocol.file.allow always &&
 	git clone dups super &&
 	(
 		cd super &&

t/t5516-fetch-push.sh

@@ -222,6 +222,7 @@ test_expect_success 'push with negotiation proceeds anyway even if negotiation f
 test_expect_success 'push with negotiation does not attempt to fetch submodules' '
 	mk_empty submodule_upstream &&
 	test_commit -C submodule_upstream submodule_commit &&
+	test_config_global protocol.file.allow always &&
 	git submodule add ./submodule_upstream submodule &&
 	mk_empty testrepo &&
 	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&

t/t5526-fetch-submodules.sh

@@ -127,6 +127,7 @@ verify_fetch_result () {
 }
 
 test_expect_success setup '
+	git config --global protocol.file.allow always &&
 	mkdir deepsubmodule &&
 	(
 		cd deepsubmodule &&

t/t5537-fetch-shallow.sh

@@ -162,6 +162,8 @@ test_expect_success 'fetch --update-shallow' '
 '
 
 test_expect_success 'fetch --update-shallow into a repo with submodules' '
+	test_config_global protocol.file.allow always &&
+
 	git init a-submodule &&
 	test_commit -C a-submodule foo &&
 
@@ -175,7 +177,8 @@ test_expect_success 'fetch --update-shallow into a repo with submodules' '
 test_expect_success 'fetch --update-shallow a commit that is also a shallow point into a repo with submodules' '
 	test_when_finished "rm -rf repo-with-sub" &&
 	git init repo-with-sub &&
-	git -C repo-with-sub submodule add ../a-submodule a-submodule &&
+	git -c protocol.file.allow=always -C repo-with-sub \
+		submodule add ../a-submodule a-submodule &&
 	git -C repo-with-sub commit -m "added submodule" &&
 
 	SHALLOW=$(cat shallow/.git/shallow) &&

t/t5545-push-options.sh

@@ -119,6 +119,7 @@ test_expect_success 'push options and submodules' '
 	test_commit -C parent one &&
 	git -C parent push --mirror up &&
 
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../upstream workbench &&
 	git -C parent/workbench remote add up ../../upstream &&
 	git -C parent commit -m "add submodule" &&

t/t5572-pull-submodule.sh

@@ -52,6 +52,10 @@ then
 fi
 test_submodule_switch_func "git_pull_noff"
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'pull --recurse-submodule setup' '
 	test_create_repo child &&
 	test_commit -C child bar &&

t/t5601-clone.sh

@@ -767,6 +767,7 @@ test_expect_success 'batch missing blob request does not inadvertently try to fe
 	echo aa >server/a &&
 	echo bb >server/b &&
 	# Also add a gitlink pointing to an arbitrary repository
+	test_config_global protocol.file.allow always &&
 	git -C server submodule add "$(pwd)/repo_for_submodule" c &&
 	git -C server add a b c &&
 	git -C server commit -m x &&

t/t5604-clone-reference.sh

@@ -303,8 +303,6 @@ test_expect_success SYMLINKS 'setup repo with manually symlinked or unknown file
 		ln -s ../an-object $obj &&
 
 		cd ../ &&
-		find . -type f | sort >../../../T.objects-files.raw &&
-		find . -type l | sort >../../../T.objects-symlinks.raw &&
 		echo unknown_content >unknown_file
 	) &&
 	git -C T fsck &&
@@ -313,19 +311,27 @@ test_expect_success SYMLINKS 'setup repo with manually symlinked or unknown file
 
 
 test_expect_success SYMLINKS 'clone repo with symlinked or unknown files at objects/' '
-	for option in --local --no-hardlinks --shared --dissociate
+	# None of these options work when cloning locally, since T has
+	# symlinks in its `$GIT_DIR/objects` directory
+	for option in --local --no-hardlinks --dissociate
 	do
-		git clone $option T T$option || return 1 &&
-		git -C T$option fsck || return 1 &&
-		git -C T$option rev-list --all --objects >T$option.objects &&
-		test_cmp T.objects T$option.objects &&
-		(
-			cd T$option/.git/objects &&
-			find . -type f | sort >../../../T$option.objects-files.raw &&
-			find . -type l | sort >../../../T$option.objects-symlinks.raw
-		)
+		test_must_fail git clone $option T T$option 2>err || return 1 &&
+		test_i18ngrep "symlink.*exists" err || return 1
 	done &&
 
+	# But `--shared` clones should still work, even when specifying
+	# a local path *and* that repository has symlinks present in its
+	# `$GIT_DIR/objects` directory.
+	git clone --shared T T--shared &&
+	git -C T--shared fsck &&
+	git -C T--shared rev-list --all --objects >T--shared.objects &&
+	test_cmp T.objects T--shared.objects &&
+	(
+		cd T--shared/.git/objects &&
+		find . -type f | sort >../../../T--shared.objects-files.raw &&
+		find . -type l | sort >../../../T--shared.objects-symlinks.raw
+	) &&
+
 	for raw in $(ls T*.raw)
 	do
 		sed -e "s!/../!/Y/!; s![0-9a-f]\{38,\}!Z!" -e "/commit-graph/d" \
@@ -333,26 +339,6 @@ test_expect_success SYMLINKS 'clone repo with symlinked or unknown files at obje
 		sort $raw.de-sha-1 >$raw.de-sha || return 1
 	done &&
 
-	cat >expected-files <<-EOF &&
-	./Y/Z
-	./Y/Z
-	./Y/Z
-	./a-loose-dir/Z
-	./an-object
-	./info/packs
-	./pack/pack-Z.idx
-	./pack/pack-Z.pack
-	./packs/pack-Z.idx
-	./packs/pack-Z.pack
-	./unknown_file
-	EOF
-
-	for option in --local --no-hardlinks --dissociate
-	do
-		test_cmp expected-files T$option.objects-files.raw.de-sha || return 1 &&
-		test_must_be_empty T$option.objects-symlinks.raw.de-sha || return 1
-	done &&
-
 	echo ./info/alternates >expected-files &&
 	test_cmp expected-files T--shared.objects-files.raw &&
 	test_must_be_empty T--shared.objects-symlinks.raw

t/t5614-clone-submodules-shallow.sh

@@ -24,6 +24,7 @@ test_expect_success 'setup' '
 
 test_expect_success 'nonshallow clone implies nonshallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 3 lines &&
@@ -33,6 +34,7 @@ test_expect_success 'nonshallow clone implies nonshallow submodule' '
 
 test_expect_success 'shallow clone with shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --depth 2 --shallow-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 2 lines &&
@@ -42,6 +44,7 @@ test_expect_success 'shallow clone with shallow submodule' '
 
 test_expect_success 'shallow clone does not imply shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --depth 2 "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 2 lines &&
@@ -51,6 +54,7 @@ test_expect_success 'shallow clone does not imply shallow submodule' '
 
 test_expect_success 'shallow clone with non shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --depth 2 --no-shallow-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 2 lines &&
@@ -60,6 +64,7 @@ test_expect_success 'shallow clone with non shallow submodule' '
 
 test_expect_success 'non shallow clone with shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --no-local --shallow-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 3 lines &&
@@ -69,6 +74,7 @@ test_expect_success 'non shallow clone with shallow submodule' '
 
 test_expect_success 'clone follows shallow recommendation' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git config -f .gitmodules submodule.sub.shallow true &&
 	git add .gitmodules &&
 	git commit -m "recommend shallow for sub" &&
@@ -87,6 +93,7 @@ test_expect_success 'clone follows shallow recommendation' '
 
 test_expect_success 'get unshallow recommended shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --no-local "file://$pwd/." super_clone &&
 	(
 		cd super_clone &&
@@ -103,6 +110,7 @@ test_expect_success 'get unshallow recommended shallow submodule' '
 
 test_expect_success 'clone follows non shallow recommendation' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git config -f .gitmodules submodule.sub.shallow false &&
 	git add .gitmodules &&
 	git commit -m "recommend non shallow for sub" &&

t/t5616-partial-clone.sh

@@ -260,6 +260,8 @@ test_expect_success 'partial clone with transfer.fsckobjects=1 works with submod
 	test_config -C src_with_sub uploadpack.allowfilter 1 &&
 	test_config -C src_with_sub uploadpack.allowanysha1inwant 1 &&
 
+	test_config_global protocol.file.allow always &&
+
 	git -C src_with_sub submodule add "file://$(pwd)/submodule" mysub &&
 	git -C src_with_sub commit -m "commit with submodule" &&
 

t/t5617-clone-submodules-remote.sh

@@ -10,6 +10,7 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 pwd=$(pwd)
 
 test_expect_success 'setup' '
+	git config --global protocol.file.allow always &&
 	git checkout -b main &&
 	test_commit commit1 &&
 	mkdir sub &&

t/t6008-rev-list-submodule.sh

@@ -27,7 +27,7 @@ test_expect_success 'setup' '
 
 	: > super-file &&
 	git add super-file &&
-	git submodule add "$(pwd)" sub &&
+	git -c protocol.file.allow=always submodule add "$(pwd)" sub &&
 	git symbolic-ref HEAD refs/heads/super &&
 	test_tick &&
 	git commit -m super-initial &&

t/t6134-pathspec-in-submodule.sh

@@ -10,7 +10,7 @@ test_expect_success 'setup a submodule' '
 	: >pretzel/a &&
 	git -C pretzel add a &&
 	git -C pretzel commit -m "add a file" -- a &&
-	git submodule add ./pretzel sub &&
+	git -c protocol.file.allow=always submodule add ./pretzel sub &&
 	git commit -a -m "add submodule" &&
 	git submodule deinit --all
 '

t/t7001-mv.sh

@@ -324,6 +324,7 @@ test_expect_success SYMLINKS 'check moved symlink' '
 rm -f moved symlink
 
 test_expect_success 'setup submodule' '
+	test_config_global protocol.file.allow always &&
 	git commit -m initial &&
 	git reset --hard &&
 	git submodule add ./. sub &&
@@ -509,6 +510,7 @@ test_expect_success 'moving a submodule in nested directories' '
 '
 
 test_expect_success 'moving nested submodules' '
+	test_config_global protocol.file.allow always &&
 	git commit -am "cleanup commit" &&
 	mkdir sub_nested_nested &&
 	(

t/t7064-wtstatus-pv2.sh

@@ -473,6 +473,7 @@ test_expect_success 'create and add submodule, submodule appears clean (A. S...)
 	git checkout initial-branch &&
 	git clone . sub_repo &&
 	git clone . super_repo &&
+	test_config_global protocol.file.allow always &&
 	(	cd super_repo &&
 		git submodule add ../sub_repo sub1 &&
 

t/t7300-clean.sh

@@ -480,6 +480,7 @@ test_expect_success 'should not clean submodules' '
 		git init &&
 		test_commit msg hello.world
 	) &&
+	test_config_global protocol.file.allow always &&
 	git submodule add ./repo/.git sub1 &&
 	git commit -m "sub1" &&
 	git branch before_sub2 &&

t/t7400-submodule-basic.sh

@@ -14,6 +14,10 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
+test_expect_success 'setup - enable local submodules' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule usage: -h' '
 	git submodule -h >out 2>err &&
 	grep "^usage: git submodule" out &&

t/t7403-submodule-sync.sh

@@ -14,6 +14,8 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 . ./test-lib.sh
 
 test_expect_success setup '
+	git config --global protocol.file.allow always &&
+
 	echo file >file &&
 	git add file &&
 	test_tick &&

t/t7406-submodule-update.sh

@@ -25,6 +25,7 @@ compare_head()
 
 
 test_expect_success 'setup a submodule tree' '
+	git config --global protocol.file.allow always &&
 	echo file > file &&
 	git add file &&
 	test_tick &&

t/t7407-submodule-foreach.sh

@@ -16,6 +16,7 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 
 test_expect_success 'setup a submodule tree' '
+	git config --global protocol.file.allow always &&
 	echo file > file &&
 	git add file &&
 	test_tick &&

t/t7408-submodule-reference.sh

@@ -17,6 +17,10 @@ test_alternate_is_used () {
 	test_cmp expect actual
 }
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'preparing first repository' '
 	test_create_repo A &&
 	(

t/t7409-submodule-detached-work-tree.sh

@@ -15,6 +15,10 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule on detached working tree' '
 	git init --bare remote &&
 	test_create_repo bundle1 &&

t/t7411-submodule-config.sh

@@ -12,6 +12,9 @@ from the database and from the worktree works.
 TEST_NO_CREATE_REPO=1
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
 test_expect_success 'submodule config cache setup' '
 	mkdir submodule &&
 	(cd submodule &&

t/t7413-submodule-is-active.sh

@@ -13,6 +13,7 @@ TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
+	git config --global protocol.file.allow always &&
 	git init sub &&
 	test_commit -C sub initial &&
 	git init super &&

t/t7414-submodule-mistakes.sh

@@ -32,7 +32,8 @@ test_expect_success 'no warning when updating entry' '
 
 test_expect_success 'submodule add does not warn' '
 	test_when_finished "git rm -rf submodule .gitmodules" &&
-	git submodule add ./embed submodule 2>stderr &&
+	git -c protocol.file.allow=always \
+		submodule add ./embed submodule 2>stderr &&
 	test_i18ngrep ! warning stderr
 '
 

t/t7416-submodule-dash-url.sh

@@ -3,6 +3,10 @@
 test_description='check handling of disallowed .gitmodule urls'
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'create submodule with protected dash in url' '
 	git init upstream &&
 	git -C upstream commit --allow-empty -m base &&

t/t7417-submodule-path-url.sh

@@ -6,6 +6,10 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'create submodule with dash in path' '
 	git init upstream &&
 	git -C upstream commit --allow-empty -m base &&

t/t7418-submodule-sparse-gitmodules.sh

@@ -17,6 +17,10 @@ export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
 
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'sparse checkout setup which hides .gitmodules' '
 	git init upstream &&
 	git init submodule &&

t/t7419-submodule-set-branch.sh

@@ -13,6 +13,10 @@ TEST_PASSES_SANITIZE_LEAK=true
 TEST_NO_CREATE_REPO=1
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule config cache setup' '
 	mkdir submodule &&
 	(cd submodule &&

t/t7420-submodule-set-url.sh

@@ -12,6 +12,10 @@ as expected.
 TEST_NO_CREATE_REPO=1
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule config cache setup' '
 	mkdir submodule &&
 	(

t/t7421-submodule-summary-add.sh

@@ -12,6 +12,10 @@ while making sure to add submodules using `git submodule add` instead of
 
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'summary test environment setup' '
 	git init sm &&
 	test_commit -C sm "add file" file file-content file-tag &&

t/t7450-bad-git-dotfiles.sh

@@ -15,6 +15,10 @@ Such as:
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'check names' '
 	cat >expect <<-\EOF &&
 	valid

t/t7506-status-submodule.sh

@@ -252,6 +252,7 @@ test_expect_success 'status with merge conflict in .gitmodules' '
 	test_create_repo_with_commit sub1 &&
 	test_tick &&
 	test_create_repo_with_commit sub2 &&
+	test_config_global protocol.file.allow always &&
 	(
 		cd super &&
 		prev=$(git rev-parse HEAD) &&
@@ -327,6 +328,7 @@ test_expect_success 'diff --submodule with merge conflict in .gitmodules' '
 # sub2 will have an untracked file
 # sub3 will have an untracked repository
 test_expect_success 'setup superproject with untracked file in nested submodule' '
+	test_config_global protocol.file.allow always &&
 	(
 		cd super &&
 		git clean -dfx &&

t/t7507-commit-verbose.sh

@@ -76,6 +76,7 @@ test_expect_success 'diff in message is retained with -v' '
 
 test_expect_success 'submodule log is stripped out too with -v' '
 	git config diff.submodule log &&
+	test_config_global protocol.file.allow always &&
 	git submodule add ./. sub &&
 	git commit -m "sub added" &&
 	(

t/t7527-builtin-fsmonitor.sh

@@ -813,6 +813,10 @@ my_match_and_clean () {
 	git -C super/dir_1/dir_2/sub clean -d -f
 }
 
+test_expect_success 'submodule setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule always visited' '
 	test_when_finished "git -C super fsmonitor--daemon stop; \
 			    rm -rf super; \

t/t7800-difftool.sh

@@ -636,6 +636,7 @@ test_expect_success 'difftool --no-symlinks detects conflict ' '
 
 test_expect_success 'difftool properly honors gitlink and core.worktree' '
 	test_when_finished rm -rf submod/ule &&
+	test_config_global protocol.file.allow always &&
 	git submodule add ./. submod/ule &&
 	test_config -C submod/ule diff.tool checktrees &&
 	test_config -C submod/ule difftool.checktrees.cmd '\''

t/t7814-grep-recurse-submodules.sh

@@ -197,6 +197,7 @@ test_expect_success !MINGW 'grep recurse submodule colon in name' '
 	git -C "su:b" commit -m "add fi:le" &&
 	test_tick &&
 
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add "../su:b" "su:b" &&
 	git -C parent commit -m "add submodule" &&
 	test_tick &&
@@ -231,6 +232,7 @@ test_expect_success 'grep history with moved submoules' '
 	git -C sub commit -m "add file" &&
 	test_tick &&
 
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../sub dir/sub &&
 	git -C parent commit -m "add submodule" &&
 	test_tick &&
@@ -275,6 +277,7 @@ test_expect_success 'grep using relative path' '
 	mkdir parent/src &&
 	echo "(1|2)d(3|4)" >parent/src/file2 &&
 	git -C parent add src/file2 &&
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../sub &&
 	git -C parent commit -m "add files and submodule" &&
 	test_tick &&
@@ -317,6 +320,7 @@ test_expect_success 'grep from a subdir' '
 	mkdir parent/src &&
 	echo "(1|2)d(3|4)" >parent/src/file &&
 	git -C parent add src/file &&
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../sub src/sub &&
 	git -C parent submodule add ../sub sub &&
 	git -C parent commit -m "add files and submodules" &&
@@ -550,6 +554,7 @@ test_expect_failure 'grep saves textconv cache in the appropriate repository' '
 
 test_expect_success 'grep partially-cloned submodule' '
 	# Set up clean superproject and submodule for partial cloning.
+	test_config_global protocol.file.allow always &&
 	git init super &&
 	git init super/sub &&
 	(

t/t9304-fast-import-marks.sh

@@ -25,6 +25,7 @@ test_expect_success 'import with large marks file' '
 '
 
 test_expect_success 'setup dump with submodule' '
+	test_config_global protocol.file.allow always &&
 	git submodule add "$PWD" sub &&
 	git commit -m "add submodule" &&
 	git fast-export HEAD >dump

t/t9350-fast-export.sh

@@ -268,6 +268,7 @@ test_expect_success 'signed-tags=warn-strip' '
 
 test_expect_success 'setup submodule' '
 
+	test_config_global protocol.file.allow always &&
 	git checkout -f main &&
 	mkdir sub &&
 	(
@@ -293,6 +294,7 @@ test_expect_success 'setup submodule' '
 
 test_expect_success 'submodule fast-export | fast-import' '
 
+	test_config_global protocol.file.allow always &&
 	SUBENT1=$(git ls-tree main^ sub) &&
 	SUBENT2=$(git ls-tree main sub) &&
 	rm -rf new &&

t/t9850-shell.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+test_description='git shell tests'
+. ./test-lib.sh
+
+test_expect_success 'shell allows upload-pack' '
+	printf 0000 >input &&
+	git upload-pack . <input >expect &&
+	git shell -c "git-upload-pack $SQ.$SQ" <input >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shell forbids other commands' '
+	test_must_fail git shell -c "git config foo.bar baz"
+'
+
+test_expect_success 'shell forbids interactive use by default' '
+	test_must_fail git shell
+'
+
+test_expect_success 'shell allows interactive command' '
+	mkdir git-shell-commands &&
+	write_script git-shell-commands/ping <<-\EOF &&
+	echo pong
+	EOF
+	echo pong >expect &&
+	echo ping | git shell >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shell complains of overlong commands' '
+	perl -e "print \"a\" x 2**12 for (0..2**19)" |
+	test_must_fail git shell 2>err &&
+	grep "too long" err
+'
+
+test_done

transport.c

@@ -1009,8 +1009,7 @@ static enum protocol_allow_config get_protocol_config(const char *type)
 	if (!strcmp(type, "http") ||
 	    !strcmp(type, "https") ||
 	    !strcmp(type, "git") ||
-	    !strcmp(type, "ssh") ||
-	    !strcmp(type, "file"))
+	    !strcmp(type, "ssh"))
 		return PROTOCOL_ALLOW_ALWAYS;
 
 	/* known scary; err on the side of caution */