linux-kernel - [PATCH 5.9 251/757] selftests/lkdtm: Use "comm" instead of "diff" for dmesg

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Date:   Tue, 27 Oct 2020 14:48:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Naresh Kamboju <naresh.kamboju@...aro.org>,
        linux-kselftest@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 251/757] selftests/lkdtm: Use "comm" instead of "diff" for dmesg

From: Kees Cook <keescook@...omium.org>

[ Upstream commit d00451c8118f8f7ab8e057bc6ee2f8b7d70b6a1c ]

Instead of full GNU diff (which smaller boot environments may not have),
use "comm" which is more available.

Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: linux-kselftest@...r.kernel.org
Fixes: f131d9edc29d ("selftests/lkdtm: Don't clear dmesg when running tests")
Signed-off-by: Kees Cook <keescook@...omium.org>
Acked-by: Shuah Khan <skhan@...uxfoundation.org>
Link: https://lore.kernel.org/r/20200909211700.2399399-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/lkdtm/run.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/lkdtm/run.sh b/tools/testing/selftests/lkdtm/run.sh
index 8383eb89d88a9..bb7a1775307b8 100755
--- a/tools/testing/selftests/lkdtm/run.sh
+++ b/tools/testing/selftests/lkdtm/run.sh
@@ -82,7 +82,7 @@ dmesg > "$DMESG"
 ($SHELL -c 'cat <(echo '"$test"') >'"$TRIGGER" 2>/dev/null) || true
 
 # Record and dump the results
-dmesg | diff --changed-group-format='%>' --unchanged-group-format='' "$DMESG" - > "$LOG" || true
+dmesg | comm --nocheck-order -13 "$DMESG" - > "$LOG" || true
 
 cat "$LOG"
 # Check for expected output
-- 
2.25.1