[PATCH 4/4] sysctl: Add 0013 to test partially updated vectors

[Joel Granados <joel.granados@kernel.org>]

Add coverage for partially updated sysctl vectors with test 0013. It
makes sure that the sysctl vector is unchanged when one of the elements
is not valid.

Signed-off-by: Joel Granados <joel.granados@kernel.org>
---
 tools/testing/selftests/sysctl/sysctl.sh | 57 ++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
index b2d8bd9026a721e96c26be20069f7f87b06a5cf7..fdf3d2fb0a2ad23a525d3205577a06d7d97576b7 100755
--- a/tools/testing/selftests/sysctl/sysctl.sh
+++ b/tools/testing/selftests/sysctl/sysctl.sh
@@ -4,6 +4,7 @@
 
 # This performs a series tests against the proc sysctl interface.
 
+# shellcheck disable=SC2317
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 
@@ -37,6 +38,7 @@ ALL_TESTS="$ALL_TESTS 0009:1:1:unregister_error:0"
 ALL_TESTS="$ALL_TESTS 0010:1:1:mnt/mnt_error:0"
 ALL_TESTS="$ALL_TESTS 0011:1:1:empty_add:0"
 ALL_TESTS="$ALL_TESTS 0012:1:1:u8_valid:0"
+ALL_TESTS="$ALL_TESTS 0013:1:1:int_0003:1"
 
 function allow_user_defaults()
 {
@@ -196,6 +198,18 @@ verify_diff_w()
 	return $?
 }
 
+# Verify that an erroneous ($2) update fails and does not change TARGET
+verify_no_partial_update()
+{
+	TEST_STR="$1"
+	echo -n "$TEST_STR" > "$TARGET"
+
+	if echo -n "$2" > "$TARGET" 2> /dev/null; then
+		return 1
+	fi
+	verify_diff_w "${TARGET}"
+}
+
 test_rc()
 {
 	if [[ $rc != 0 ]]; then
@@ -501,6 +515,40 @@ run_limit_digit_int_array()
 	test_rc
 }
 
+# You used an int array and one of the elements is not acceptable
+run_int_array_no_partial_update()
+{
+	echo -n "Testing invalid array element does not partially update ... "
+        # Expect failure because of 3rd element (abc).
+	if ! verify_no_partial_update "1 2 3 4" "10 20 abc 40"; then
+		echo "FAIL" >&2
+		rc=1
+	else
+		echo "OK"
+	fi
+	test_rc
+
+	echo -n "Testing out of range array element does not partially update ... "
+        # Expect failure because of 3rd element (greater than int)
+	if ! verify_no_partial_update "1 2 3 4" "10 20 $((INT_MAX + 1)) 40"; then
+		echo "FAIL" >&2
+		rc=1
+	else
+		echo "OK"
+	fi
+	test_rc
+
+	echo -n "Testing invalid first array element does not update ... "
+        # Expect failure of 1st element
+	if ! verify_no_partial_update "1 2 3 4" "abc 20 30 40"; then
+		echo "FAIL" >&2
+		rc=1
+	else
+		echo "OK"
+	fi
+	test_rc
+}
+
 # You are using an unsigned int
 run_limit_digit_uint()
 {
@@ -880,6 +928,14 @@ sysctl_test_0012()
 	return 0
 }
 
+sysctl_test_0013()
+{
+	TARGET="${SYSCTL}/$(get_test_target 0013)"
+	reset_vals
+
+	run_int_array_no_partial_update
+}
+
 list_tests()
 {
 	echo "Test ID list:"
@@ -900,6 +956,7 @@ list_tests()
 	echo "0010 x $(get_test_count 0010) - tests sysct mount point"
 	echo "0011 x $(get_test_count 0011) - tests empty directories"
 	echo "0012 x $(get_test_count 0012) - tests range check for u8 proc_handler"
+	echo "0013 x $(get_test_count 0013) - tests partially update vectors on error"
 }
 
 usage()

-- 
2.50.1