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([2804:5078:803:5200:58f2:fc97:371f:2]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-723185484d5sm4726836a34.26.2025.01.14.09.18.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jan 2025 09:18:06 -0800 (PST) Message-ID: <12c6681e2d13994c2efd5d25372293b9f53a9f8a.camel@suse.com> Subject: Re: [PATCH v2] selftests: livepatch: test if ftrace can trace a livepatched function From: Marcos Paulo de Souza To: Filipe Xavier , 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, Felipe Xavier Date: Tue, 14 Jan 2025 14:18:02 -0300 In-Reply-To: <20250111-ftrace-selftest-livepatch-v2-1-9f4ff90f251a@gmail.com> References: <20250111-ftrace-selftest-livepatch-v2-1-9f4ff90f251a@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.2 (by Flathub.org) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2025-01-11 at 15:42 -0300, Filipe Xavier wrote: > This new test makes sure that ftrace can trace a > function that was introduced by a livepatch. >=20 > Signed-off-by: Filipe Xavier Thanks for the new test Filipe! I have some nits below, but these don't need to be addressed for the test to be merged. Either way, Reviewed-by: Marcos Paulo de Souza Tested-by: Marcos Paulo de Souza > --- > Changes in v2: > - functions.sh: added reset tracing on push and pop_config. > - test-ftrace.sh: enabled tracing_on before test init. > - nitpick: added double quotations on filenames and fixed some > wording.=20 > - Link to v1: > https://lore.kernel.org/r/20250102-ftrace-selftest-livepatch-v1-1-84880ba= efc1b@gmail.com > --- > =C2=A0tools/testing/selftests/livepatch/functions.sh=C2=A0=C2=A0 | 14 +++= +++++++ > =C2=A0tools/testing/selftests/livepatch/test-ftrace.sh | 33 > ++++++++++++++++++++++++ > =C2=A02 files changed, 47 insertions(+) >=20 > diff --git a/tools/testing/selftests/livepatch/functions.sh > b/tools/testing/selftests/livepatch/functions.sh > index > e5d06fb402335d85959bafe099087effc6ddce12..e6c13514002dae5f8d7461f90b8 > 241ab43024ea4 100644 > --- a/tools/testing/selftests/livepatch/functions.sh > +++ b/tools/testing/selftests/livepatch/functions.sh > @@ -62,6 +62,9 @@ function push_config() { > =C2=A0 awk -F'[: ]' '{print "file " $1 " line " $2 > " " $4}') > =C2=A0 FTRACE_ENABLED=3D$(sysctl --values kernel.ftrace_enabled) > =C2=A0 KPROBE_ENABLED=3D$(cat "$SYSFS_KPROBES_DIR/enabled") > + TRACING_ON=3D$(cat "$SYSFS_DEBUG_DIR/tracing/tracing_on") > + CURRENT_TRACER=3D$(cat > "$SYSFS_DEBUG_DIR/tracing/current_tracer") > + FTRACE_FILTER=3D$(cat > "$SYSFS_DEBUG_DIR/tracing/set_ftrace_filter") > =C2=A0} > =C2=A0 > =C2=A0function pop_config() { > @@ -74,6 +77,17 @@ function pop_config() { > =C2=A0 if [[ -n "$KPROBE_ENABLED" ]]; then > =C2=A0 echo "$KPROBE_ENABLED" > > "$SYSFS_KPROBES_DIR/enabled" > =C2=A0 fi > + if [[ -n "$TRACING_ON" ]]; then > + echo "$TRACING_ON" > > "$SYSFS_DEBUG_DIR/tracing/tracing_on" > + fi > + if [[ -n "$CURRENT_TRACER" ]]; then > + echo "$CURRENT_TRACER" > > "$SYSFS_DEBUG_DIR/tracing/current_tracer" > + fi > + if [[ "$FTRACE_FILTER" =3D=3D *"#"* ]]; then > + echo > "$SYSFS_DEBUG_DIR/tracing/set_ftrace_filter" > + elif [[ -n "$FTRACE_FILTER" ]]; then > + echo "$FTRACE_FILTER" > > "$SYSFS_DEBUG_DIR/tracing/set_ftrace_filter" > + fi > =C2=A0} I believe that this could be a separate patch, since this is new functionality that's being added to functions.sh, and not exactly related to the new test. > =C2=A0 > =C2=A0function set_dynamic_debug() { > diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh > b/tools/testing/selftests/livepatch/test-ftrace.sh > index > fe14f248913acbec46fb6c0fec38a2fc84209d39..66af5d726c52e48e5177804e182 > b4ff31784d5ac 100755 > --- a/tools/testing/selftests/livepatch/test-ftrace.sh > +++ b/tools/testing/selftests/livepatch/test-ftrace.sh > @@ -61,4 +61,37 @@ livepatch: '$MOD_LIVEPATCH': unpatching complete > =C2=A0% rmmod $MOD_LIVEPATCH" > =C2=A0 > =C2=A0 > +# - verify livepatch can load > +# - check if traces have a patched function > +# - unload livepatch and reset trace > + > +start_test "trace livepatched function and check that the live patch > remains in effect" > + > +TRACE_FILE=3D"$SYSFS_DEBUG_DIR/tracing/trace" > +FUNCTION_NAME=3D"livepatch_cmdline_proc_show" > + > +load_lp $MOD_LIVEPATCH > + > +echo 1 > "$SYSFS_DEBUG_DIR/tracing/tracing_on" > +echo $FUNCTION_NAME > "$SYSFS_DEBUG_DIR/tracing/set_ftrace_filter" > +echo "function" > "$SYSFS_DEBUG_DIR/tracing/current_tracer" > +echo "" > "$TRACE_FILE" > + > +if [[ "$(cat /proc/cmdline)" !=3D "$MOD_LIVEPATCH: this has been live > patched" ]] ; then > + echo -e "FAIL\n\n" > + die "livepatch kselftest(s) failed" > +fi > + > +grep -q $FUNCTION_NAME "$TRACE_FILE" > +FOUND=3D$? > + > +disable_lp $MOD_LIVEPATCH > +unload_lp $MOD_LIVEPATCH > + > +if [ "$FOUND" -eq 1 ]; then > + echo -e "FAIL\n\n" > + die "livepatch kselftest(s) failed" > +fi > + > + > =C2=A0exit 0 The test works, and that's very cool. But when running locally, I find the if we miss check_result call it doesn't add a newline after the "ok": ... # timeout set to 0 =20 # selftests: livepatch: test-ftrace.sh =20 # TEST: livepatch interaction with ftrace_enabled sysctl ... ok =20 # TEST: trace livepatched function and check that the live patch remains in effect ... ok 5 selftests: livepatch: test-ftrace.sh =20 # timeout set to 0 =20 # selftests: livepatch: test-sysfs.sh =20 ... If the check_result below is added the output if sane again: ... # selftests: livepatch: test-ftrace.sh # TEST: livepatch interaction with ftrace_enabled sysctl ... ok # TEST: trace livepatched function and check that the live patch remains in effect ... ok ok 5 selftests: livepatch: test-ftrace.sh ... I checked and this would be the only one test without using check_result, so maybe we should add this either way? I'm not sure what you guys think about it. diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh b/tools/testing/selftests/livepatch/test-ftrace.sh index 66af5d726c52..135c0fb17a98 100755 --- a/tools/testing/selftests/livepatch/test-ftrace.sh +++ b/tools/testing/selftests/livepatch/test-ftrace.sh @@ -93,5 +93,18 @@ if [ "$FOUND" -eq 1 ]; then die "livepatch kselftest(s) failed" fi =20 +check_result "% insmod test_modules/$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 +% 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" + =20 exit 0 >=20 > --- > base-commit: fc033cf25e612e840e545f8d5ad2edd6ba613ed5 > change-id: 20250101-ftrace-selftest-livepatch-161fb77dbed8 >=20 > Best regards,