1 files changed, 76 insertions, 0 deletions
diff --git a/t/t7415-submodule-names.sh b/t/t7415-submodule-names.sh
new file mode 100755
index 0000000000..75fa071c6d
--- /dev/null
+++ b/t/t7415-submodule-names.sh
@@ -0,0 +1,76 @@
+#!/bin/sh
+
+test_description='check handling of .. in submodule names
+
+Exercise the name-checking function on a variety of names, and then give a
+real-world setup that confirms we catch this in practice.
+'
+. ./test-lib.sh
+
+test_expect_success 'check names' '
+	cat >expect <<-\EOF &&
+	valid
+	valid/with/paths
+	EOF
+
+	git submodule--helper check-name >actual <<-\EOF &&
+	valid
+	valid/with/paths
+
+	../foo
+	/../foo
+	..\foo
+	\..\foo
+	foo/..
+	foo/../
+	foo\..
+	foo\..\
+	foo/../bar
+	EOF
+
+	test_cmp expect actual
+'
+
+test_expect_success 'create innocent subrepo' '
+	git init innocent &&
+	git -C innocent commit --allow-empty -m foo
+'
+
+test_expect_success 'submodule add refuses invalid names' '
+	test_must_fail \
+		git submodule add --name ../../modules/evil "$PWD/innocent" evil
+'
+
+test_expect_success 'add evil submodule' '
+	git submodule add "$PWD/innocent" evil &&
+
+	mkdir modules &&
+	cp -r .git/modules/evil modules &&
+	write_script modules/evil/hooks/post-checkout <<-\EOF &&
+	echo >&2 "RUNNING POST CHECKOUT"
+	EOF
+
+	git config -f .gitmodules submodule.evil.update checkout &&
+	git config -f .gitmodules --rename-section \
+		submodule.evil submodule.../../modules/evil &&
+	git add modules &&
+	git commit -am evil
+'
+
+# This step seems like it shouldn't be necessary, since the payload is
+# contained entirely in the evil submodule. But due to the vagaries of the
+# submodule code, checking out the evil module will fail unless ".git/modules"
+# exists. Adding another submodule (with a name that sorts before "evil") is an
+# easy way to make sure this is the case in the victim clone.
+test_expect_success 'add other submodule' '
+	git submodule add "$PWD/innocent" another-module &&
+	git add another-module &&
+	git commit -am another
+'
+
+test_expect_success 'clone evil superproject' '
+	git clone --recurse-submodules . victim >output 2>&1 &&
+	! grep "RUNNING POST CHECKOUT" output
+'
+
+test_done