linux-kernel - [PATCH] kselftests/damon: add support for checking secureboot status

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Message-Id: <20220624195239.7293-1-gautammenghani201@gmail.com>
Date:   Sat, 25 Jun 2022 01:22:39 +0530
From:   Gautam <gautammenghani201@...il.com>
To:     sj@...nel.org, shuah@...nel.org
Cc:     Gautam <gautammenghani201@...il.com>, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kselftests/damon: add support for checking secureboot status

The kernel is in lockdown mode when secureboot is enabled and hence
debugfs cannot be used. But the error printed after running tests does
not indicate this currently:

>TAP version 13
>1..6
># selftests: damon: debugfs_attrs.sh
># cat: /sys/kernel/debug/damon/monitor_on: Operation not permitted
># _debugfs_common.sh: line 48: [: =: unary operator expected
># cat: /sys/kernel/debug/damon/attrs: Operation not permitted
># _debugfs_common.sh: line 11: /sys/kernel/debug/damon/attrs: Operation 
> not permitted
># writing 1 2 3 4 5 to /sys/kernel/debug/damon/attrs doesn't return 0
># expected because: valid input
># _debugfs_common.sh: line 16: /sys/kernel/debug/damon/attrs: Operation 
> not permitted
>not ok 1 selftests: damon: debugfs_attrs.sh # exit=1


After adding the check for secureboot, the output is as follows:

>TAP version 13
>1..6
># selftests: damon: debugfs_attrs.sh
># debugfs cannot work with secureboot enabled
>not ok 1 selftests: damon: debugfs_attrs.sh # exit=1


Signed-off-by: Gautam <gautammenghani201@...il.com>
---
 tools/testing/selftests/damon/_chk_dependency.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)
 mode change 100644 => 100755 tools/testing/selftests/damon/_chk_dependency.sh

diff --git a/tools/testing/selftests/damon/_chk_dependency.sh b/tools/testing/selftests/damon/_chk_dependency.sh
old mode 100644
new mode 100755
index 0189db81550b..6e45c1fe230e
--- a/tools/testing/selftests/damon/_chk_dependency.sh
+++ b/tools/testing/selftests/damon/_chk_dependency.sh
@@ -26,3 +26,13 @@ do
 		exit 1
 	fi
 done
+
+secureboot_error="Operation not permitted"
+for f in attrs target_ids monitor_on
+do
+	status=$( cat "$DBGFS/$f" 2>&1 )
+	if [ "${status#*$secureboot_error}" != "$status" ]; then
+		echo "debugfs cannot work with secureboot enabled"
+		exit 1
+	fi
+done
-- 
2.36.1