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Fri, 20 Feb 2026 06:12:44 -0800 (PST) From: Marcos Paulo de Souza Date: Fri, 20 Feb 2026 11:12:33 -0300 Subject: [PATCH 1/2] selftests: livepatch: test-ftrace: livepatch a traced function Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260220-lp-test-trace-v1-1-4b6703cd01a6@suse.com> References: <20260220-lp-test-trace-v1-0-4b6703cd01a6@suse.com> In-Reply-To: <20260220-lp-test-trace-v1-0-4b6703cd01a6@suse.com> To: Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Petr Mladek , Joe Lawrence , Shuah Khan Cc: live-patching@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Marcos Paulo de Souza X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1771596757; l=2107; i=mpdesouza@suse.com; s=20231031; h=from:subject:message-id; bh=lfkcP3ZdIIOq+1bZXx5CwRguKuxe5MWg0qFqkWJX6To=; b=j0Hy38QFPzn4yRGnk1pGC8agT7SWqZWsfvcqLHUjNE38K6fhxH9e2jAeIpsiR17McRfZSkL8I UAuk8Hzj9wJDaMKCHcPbKQWymB9g+38qIJH2vWs64xRU7cjDGNbk7q5 X-Developer-Key: i=mpdesouza@suse.com; a=ed25519; pk=/Ni/TsKkr69EOmdZXkp1Q/BlzDonbOBRsfPa18ySIwU= This is basically the inverse case of commit 474eecc882ae ("selftests: livepatch: test if ftrace can trace a livepatched function") but ensuring that livepatch would work on a traced function. Signed-off-by: Marcos Paulo de Souza --- tools/testing/selftests/livepatch/test-ftrace.sh | 36 ++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh b/tools/testing/selftests/livepatch/test-ftrace.sh index 094176f1a46a..c6222cc037c5 100755 --- a/tools/testing/selftests/livepatch/test-ftrace.sh +++ b/tools/testing/selftests/livepatch/test-ftrace.sh @@ -95,4 +95,40 @@ livepatch: '$MOD_LIVEPATCH': completing unpatching transition livepatch: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH" + +# - trace a function +# - verify livepatch can load targgeting no the same traced function +# - check if the livepatch is in effect +# - reset trace and unload livepatch + +start_test "livepatch a traced function and check that the live patch remains in effect" + +FUNCTION_NAME="cmdline_proc_show" + +trace_function "$FUNCTION_NAME" +load_lp $MOD_LIVEPATCH + +if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then + log "livepatch: ok" +fi + +check_traced_functions "$FUNCTION_NAME" + +disable_lp $MOD_LIVEPATCH +unload_lp $MOD_LIVEPATCH + +check_result "% insmod test_modules/$MOD_LIVEPATCH.ko +livepatch: enabling patch '$MOD_LIVEPATCH' +livepatch: '$MOD_LIVEPATCH': initializing patching transition +livepatch: '$MOD_LIVEPATCH': starting patching transition +livepatch: '$MOD_LIVEPATCH': completing patching transition +livepatch: '$MOD_LIVEPATCH': patching complete +livepatch: ok +% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled +livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +livepatch: '$MOD_LIVEPATCH': starting unpatching transition +livepatch: '$MOD_LIVEPATCH': completing unpatching transition +livepatch: '$MOD_LIVEPATCH': unpatching complete +% rmmod $MOD_LIVEPATCH" + exit 0 -- 2.52.0