selftests/livepatch: add sysfs test

Add a test for livepatch sysfs entries.

Signed-off-by: Song Liu <song@kernel.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220902205208.3117798-3-song@kernel.org

1 files changed, 34 insertions, 0 deletions

diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
index 9230b869371d..433e23dd9dcb 100644
--- a/tools/testing/selftests/livepatch/functions.sh
+++ b/tools/testing/selftests/livepatch/functions.sh
@@ -6,6 +6,7 @@
 
 MAX_RETRIES=600
 RETRY_INTERVAL=".1"	# seconds
+KLP_SYSFS_DIR="/sys/kernel/livepatch"
 
 # Kselftest framework requirement - SKIP code is 4
 ksft_skip=4
@@ -308,3 +309,36 @@ function check_result {
 
 	cleanup_dmesg_file
 }
+
+# check_sysfs_rights(modname, rel_path, expected_rights) - check sysfs
+# path permissions
+#	modname - livepatch module creating the sysfs interface
+#	rel_path - relative path of the sysfs interface
+#	expected_rights - expected access rights
+function check_sysfs_rights() {
+	local mod="$1"; shift
+	local rel_path="$1"; shift
+	local expected_rights="$1"; shift
+
+	local path="$KLP_SYSFS_DIR/$mod/$rel_path"
+	local rights=$(/bin/stat --format '%A' "$path")
+	if test "$rights" != "$expected_rights" ; then
+		die "Unexpected access rights of $path: $expected_rights vs. $rights"
+	fi
+}
+
+# check_sysfs_value(modname, rel_path, expected_value) - check sysfs value
+#	modname - livepatch module creating the sysfs interface
+#	rel_path - relative path of the sysfs interface
+#	expected_value - expected value read from the file
+function check_sysfs_value() {
+	local mod="$1"; shift
+	local rel_path="$1"; shift
+	local expected_value="$1"; shift
+
+	local path="$KLP_SYSFS_DIR/$mod/$rel_path"
+	local value=`cat $path`
+	if test "$value" != "$expected_value" ; then
+		die "Unexpected value in $path: $expected_value vs. $value"
+	fi
+}