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Thu, 08 Oct 2026 02:59:21 -0700 (PDT) Received: from yafangs-Air ([240e:46c:2100:3ace:b801:9432:769f:ff9d]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a9ff7ff13esm3422790a91.7.2026.10.08.02.59.17 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 08 Oct 2026 02:59:21 -0700 (PDT) From: Yafang Shao To: jpoimboe@kernel.org, jikos@kernel.org, mbenes@suse.cz, pmladek@suse.com, joe.lawrence@redhat.com, song@kernel.org Cc: live-patching@vger.kernel.org, linux-kernel@vger.kernel.org, Yafang Shao Subject: [PATCH v11 8/9] selftests/livepatch: Add state test for provides/obsoletes Date: Thu, 8 Oct 2026 17:58:29 +0800 Message-ID: <20261008095830.26308-9-laoar.shao@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20261008095830.26308-1-laoar.shao@gmail.com> References: <20261008095830.26308-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: live-patching@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Livepatches with different provides ids must not share the same state id, unless the second livepatch replaces the first one via obsoletes. Add provides/obsoletes module parameters to test_klp_state and test_klp_state2, and cover both cases: reusing a state id across different provides ids is rejected, while it is allowed when the new livepatch obsoletes the old one. Suggested-by: Petr Mladek Signed-off-by: Yafang Shao --- .../livepatch/test-provides-obsoletes.sh | 239 ++++++++++++++++++ .../livepatch/test_modules/test_klp_state.c | 36 ++- .../livepatch/test_modules/test_klp_state2.c | 44 +++- 3 files changed, 303 insertions(+), 16 deletions(-) diff --git a/tools/testing/selftests/livepatch/test-provides-obsoletes.sh b/tools/testing/selftests/livepatch/test-provides-obsoletes.sh index 78a644f6ec56..b92188fcf45f 100755 --- a/tools/testing/selftests/livepatch/test-provides-obsoletes.sh +++ b/tools/testing/selftests/livepatch/test-provides-obsoletes.sh @@ -6,6 +6,8 @@ MOD_MEMINFO=test_klp_meminfo_lp MOD_CMDLINE=test_klp_cmdline_lp +MOD_STATE=test_klp_state +MOD_STATE2=test_klp_state2 setup_config detect_provides_attr @@ -226,4 +228,241 @@ livepatch: '$MOD_MEMINFO': completing unpatching transition livepatch: '$MOD_MEMINFO': unpatching complete % rmmod $MOD_MEMINFO" + +# - load a livepatch with provides=1 that registers state ID 1 +# - try to load another livepatch with provides=1 that reuses the same +# state ID. The second one will replace the first one. +# - disable and unload the remaining livepatch + +start_test "same state, same provides" + +load_lp $MOD_STATE state=1 provides=1 +load_lp $MOD_STATE2 state=1 provides=1 + +disable_lp $MOD_STATE2 +unload_lp $MOD_STATE2 +unload_lp $MOD_STATE + +check_result "% insmod test_modules/$MOD_STATE.ko state=1 provides=1 +livepatch: enabling patch '$MOD_STATE' +livepatch: '$MOD_STATE': initializing patching transition +$MOD_STATE: pre_patch_callback: vmlinux +$MOD_STATE: allocate_loglevel_state: allocating space to store console_loglevel +livepatch: '$MOD_STATE': starting patching transition +livepatch: '$MOD_STATE': completing patching transition +$MOD_STATE: post_patch_callback: vmlinux +$MOD_STATE: fix_console_loglevel: fixing console_loglevel +livepatch: '$MOD_STATE': patching complete +% insmod test_modules/$MOD_STATE2.ko state=1 provides=1 +livepatch: enabling patch '$MOD_STATE2' +livepatch: '$MOD_STATE2': initializing patching transition +$MOD_STATE2: pre_patch_callback: vmlinux +$MOD_STATE2: allocate_loglevel_state: space to store console_loglevel already allocated +livepatch: '$MOD_STATE2': starting patching transition +livepatch: '$MOD_STATE2': completing patching transition +$MOD_STATE2: post_patch_callback: vmlinux +$MOD_STATE2: fix_console_loglevel: taking over the console_loglevel change +livepatch: '$MOD_STATE2': patching complete +% echo 0 > $SYSFS_KLP_DIR/$MOD_STATE2/enabled +livepatch: '$MOD_STATE2': initializing unpatching transition +$MOD_STATE2: pre_unpatch_callback: vmlinux +$MOD_STATE2: restore_console_loglevel: restoring console_loglevel +livepatch: '$MOD_STATE2': starting unpatching transition +livepatch: '$MOD_STATE2': completing unpatching transition +$MOD_STATE2: post_unpatch_callback: vmlinux +$MOD_STATE2: free_loglevel_state: freeing space for the stored console_loglevel +livepatch: '$MOD_STATE2': unpatching complete +% rmmod $MOD_STATE2 +% rmmod $MOD_STATE" + + +# - load a livepatch with provides=1 that registers state ID 1 +# - try to load another livepatch with provides=2 that reuses the same +# state ID. The second one must be rejected because livepatches with +# different provides ids must not share the same state id. +# - disable and unload the remaining livepatch + +start_test "same state, misc provides" + +load_lp $MOD_STATE state=1 provides=1 +load_failing_mod $MOD_STATE2 state=1 provides=2 + +disable_lp $MOD_STATE +unload_lp $MOD_STATE + +check_result "% insmod test_modules/$MOD_STATE.ko state=1 provides=1 +livepatch: enabling patch '$MOD_STATE' +livepatch: '$MOD_STATE': initializing patching transition +$MOD_STATE: pre_patch_callback: vmlinux +$MOD_STATE: allocate_loglevel_state: allocating space to store console_loglevel +livepatch: '$MOD_STATE': starting patching transition +livepatch: '$MOD_STATE': completing patching transition +$MOD_STATE: post_patch_callback: vmlinux +$MOD_STATE: fix_console_loglevel: fixing console_loglevel +livepatch: '$MOD_STATE': patching complete +% insmod test_modules/$MOD_STATE2.ko state=1 provides=2 +livepatch: Livepatch patch ($MOD_STATE2) is not compatible with the already installed livepatches. +insmod: ERROR: could not insert module test_modules/$MOD_STATE2.ko: Invalid parameters +% echo 0 > $SYSFS_KLP_DIR/$MOD_STATE/enabled +livepatch: '$MOD_STATE': initializing unpatching transition +$MOD_STATE: pre_unpatch_callback: vmlinux +$MOD_STATE: restore_console_loglevel: restoring console_loglevel +livepatch: '$MOD_STATE': starting unpatching transition +livepatch: '$MOD_STATE': completing unpatching transition +$MOD_STATE: post_unpatch_callback: vmlinux +$MOD_STATE: free_loglevel_state: freeing space for the stored console_loglevel +livepatch: '$MOD_STATE': unpatching complete +% rmmod $MOD_STATE" + + +# Take over system state change by a patch that obsoletes the old one. +# Although the provides IDs are different, the second patch's obsoletes +# list includes the first patch's provides ID, so it can replace the +# first patch and reuse the same state ID. + +start_test "same states, replaced by obsoletes" + +load_lp $MOD_STATE state=1 provides=1 +load_lp $MOD_STATE2 state=1 provides=2 obsoletes=1 +unload_lp $MOD_STATE +disable_lp $MOD_STATE2 +unload_lp $MOD_STATE2 + +check_result "% insmod test_modules/$MOD_STATE.ko state=1 provides=1 +livepatch: enabling patch '$MOD_STATE' +livepatch: '$MOD_STATE': initializing patching transition +$MOD_STATE: pre_patch_callback: vmlinux +$MOD_STATE: allocate_loglevel_state: allocating space to store console_loglevel +livepatch: '$MOD_STATE': starting patching transition +livepatch: '$MOD_STATE': completing patching transition +$MOD_STATE: post_patch_callback: vmlinux +$MOD_STATE: fix_console_loglevel: fixing console_loglevel +livepatch: '$MOD_STATE': patching complete +% insmod test_modules/$MOD_STATE2.ko state=1 provides=2 obsoletes=1 +livepatch: enabling patch '$MOD_STATE2' +livepatch: '$MOD_STATE2': initializing patching transition +$MOD_STATE2: pre_patch_callback: vmlinux +$MOD_STATE2: allocate_loglevel_state: space to store console_loglevel already allocated +livepatch: '$MOD_STATE2': starting patching transition +livepatch: '$MOD_STATE2': completing patching transition +$MOD_STATE2: post_patch_callback: vmlinux +$MOD_STATE2: fix_console_loglevel: taking over the console_loglevel change +livepatch: '$MOD_STATE2': patching complete +% rmmod $MOD_STATE +% echo 0 > $SYSFS_KLP_DIR/$MOD_STATE2/enabled +livepatch: '$MOD_STATE2': initializing unpatching transition +$MOD_STATE2: pre_unpatch_callback: vmlinux +$MOD_STATE2: restore_console_loglevel: restoring console_loglevel +livepatch: '$MOD_STATE2': starting unpatching transition +livepatch: '$MOD_STATE2': completing unpatching transition +$MOD_STATE2: post_unpatch_callback: vmlinux +$MOD_STATE2: free_loglevel_state: freeing space for the stored console_loglevel +livepatch: '$MOD_STATE2': unpatching complete +% rmmod $MOD_STATE2" + + +# - load a livepatch that modifies system state (state=1) with +# provides=1, then another livepatch with the same provides id=1 that declares +# a different system state (state=2) +# - the second livepatch would replace the first one due to the same +# provides id, but it does not handle the system state modified by +# the first one, therefore it is rejected as incompatible and the +# insmod must fail. +# - verify the first livepatch is still alive, then disable and +# unload it. + +start_test "misc states, same provides" +load_lp $MOD_STATE state=1 provides=1 +load_failing_mod $MOD_STATE2 state=2 provides=1 + +disable_lp $MOD_STATE +unload_lp $MOD_STATE + +check_result "% insmod test_modules/$MOD_STATE.ko state=1 provides=1 +livepatch: enabling patch '$MOD_STATE' +livepatch: '$MOD_STATE': initializing patching transition +$MOD_STATE: pre_patch_callback: vmlinux +$MOD_STATE: allocate_loglevel_state: allocating space to store console_loglevel +livepatch: '$MOD_STATE': starting patching transition +livepatch: '$MOD_STATE': completing patching transition +$MOD_STATE: post_patch_callback: vmlinux +$MOD_STATE: fix_console_loglevel: fixing console_loglevel +livepatch: '$MOD_STATE': patching complete +% insmod test_modules/$MOD_STATE2.ko state=2 provides=1 +livepatch: Livepatch patch ($MOD_STATE2) is not compatible with the already installed livepatches. +insmod: ERROR: could not insert module test_modules/$MOD_STATE2.ko: Invalid parameters +% echo 0 > $SYSFS_KLP_DIR/$MOD_STATE/enabled +livepatch: '$MOD_STATE': initializing unpatching transition +$MOD_STATE: pre_unpatch_callback: vmlinux +$MOD_STATE: restore_console_loglevel: restoring console_loglevel +livepatch: '$MOD_STATE': starting unpatching transition +livepatch: '$MOD_STATE': completing unpatching transition +$MOD_STATE: post_unpatch_callback: vmlinux +$MOD_STATE: free_loglevel_state: freeing space for the stored console_loglevel +livepatch: '$MOD_STATE': unpatching complete +% rmmod $MOD_STATE" + + +# - load two livepatches with different provides ids (provides=1 and +# provides=2) that modify different system states (state=1 and +# state=2). Neither of them replaces the other, because their +# provides ids differ (and the obsoletes lists are empty), so they +# can coexist. +# - verify the provides sysfs value of both livepatches +# - disable and unload both livepatches + +start_test "misc states, misc provides" + +load_lp $MOD_STATE state=1 provides=1 +load_lp $MOD_STATE2 state=2 provides=2 + +check_sysfs_value "$MOD_STATE" "provides" "1" +check_sysfs_value "$MOD_STATE2" "provides" "2" + +disable_lp $MOD_STATE2 +unload_lp $MOD_STATE2 +disable_lp $MOD_STATE +unload_lp $MOD_STATE + +check_result "% insmod test_modules/$MOD_STATE.ko state=1 provides=1 +livepatch: enabling patch '$MOD_STATE' +livepatch: '$MOD_STATE': initializing patching transition +$MOD_STATE: pre_patch_callback: vmlinux +$MOD_STATE: allocate_loglevel_state: allocating space to store console_loglevel +livepatch: '$MOD_STATE': starting patching transition +livepatch: '$MOD_STATE': completing patching transition +$MOD_STATE: post_patch_callback: vmlinux +$MOD_STATE: fix_console_loglevel: fixing console_loglevel +livepatch: '$MOD_STATE': patching complete +% insmod test_modules/$MOD_STATE2.ko state=2 provides=2 +livepatch: enabling patch '$MOD_STATE2' +livepatch: '$MOD_STATE2': initializing patching transition +$MOD_STATE2: pre_patch_callback: vmlinux +$MOD_STATE2: allocate_loglevel_state: allocating space to store console_loglevel +livepatch: '$MOD_STATE2': starting patching transition +livepatch: '$MOD_STATE2': completing patching transition +$MOD_STATE2: post_patch_callback: vmlinux +$MOD_STATE2: fix_console_loglevel: fixing console_loglevel +livepatch: '$MOD_STATE2': patching complete +% echo 0 > $SYSFS_KLP_DIR/$MOD_STATE2/enabled +livepatch: '$MOD_STATE2': initializing unpatching transition +$MOD_STATE2: pre_unpatch_callback: vmlinux +$MOD_STATE2: restore_console_loglevel: restoring console_loglevel +livepatch: '$MOD_STATE2': starting unpatching transition +livepatch: '$MOD_STATE2': completing unpatching transition +$MOD_STATE2: post_unpatch_callback: vmlinux +$MOD_STATE2: free_loglevel_state: freeing space for the stored console_loglevel +livepatch: '$MOD_STATE2': unpatching complete +% rmmod $MOD_STATE2 +% echo 0 > $SYSFS_KLP_DIR/$MOD_STATE/enabled +livepatch: '$MOD_STATE': initializing unpatching transition +$MOD_STATE: pre_unpatch_callback: vmlinux +$MOD_STATE: restore_console_loglevel: restoring console_loglevel +livepatch: '$MOD_STATE': starting unpatching transition +livepatch: '$MOD_STATE': completing unpatching transition +$MOD_STATE: post_unpatch_callback: vmlinux +$MOD_STATE: free_loglevel_state: freeing space for the stored console_loglevel +livepatch: '$MOD_STATE': unpatching complete +% rmmod $MOD_STATE" + exit 0 diff --git a/tools/testing/selftests/livepatch/test_modules/test_klp_state.c b/tools/testing/selftests/livepatch/test_modules/test_klp_state.c index f53eead9d55b..3511cf081fef 100644 --- a/tools/testing/selftests/livepatch/test_modules/test_klp_state.c +++ b/tools/testing/selftests/livepatch/test_modules/test_klp_state.c @@ -9,10 +9,25 @@ #include #include -#define CONSOLE_LOGLEVEL_STATE 1 /* Version 1 does not support migration. */ #define CONSOLE_LOGLEVEL_STATE_VERSION 1 +static unsigned int state = 1; +module_param(state, uint, 0444); +MODULE_PARM_DESC(state, "console loglevel state (default=1)"); + +#ifdef CONFIG_KLP_HAS_PROVIDES +static unsigned int provides; +module_param(provides, uint, 0444); +MODULE_PARM_DESC(provides, "provides id (default=0)"); + +#define KLP_MAX_OBSOLETES 16 +static unsigned int obsoletes[KLP_MAX_OBSOLETES]; +static int nr_obsoletes; +module_param_array(obsoletes, uint, &nr_obsoletes, 0444); +MODULE_PARM_DESC(obsoletes, "obsoletes provides ids"); +#endif + static const char *const module_state[] = { [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state", [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init", @@ -35,7 +50,7 @@ static int allocate_loglevel_state(void) { struct klp_state *loglevel_state; - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return -EINVAL; @@ -52,7 +67,7 @@ static void fix_console_loglevel(void) { struct klp_state *loglevel_state; - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return; @@ -65,7 +80,7 @@ static void restore_console_loglevel(void) { struct klp_state *loglevel_state; - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return; @@ -77,7 +92,7 @@ static void free_loglevel_state(void) { struct klp_state *loglevel_state; - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return; @@ -133,7 +148,6 @@ static struct klp_object objs[] = { static struct klp_state states[] = { { - .id = CONSOLE_LOGLEVEL_STATE, .version = CONSOLE_LOGLEVEL_STATE_VERSION, }, { } }; @@ -151,6 +165,16 @@ static struct klp_patch patch = { static int test_klp_callbacks_demo_init(void) { +#ifdef CONFIG_KLP_HAS_PROVIDES + patch.provides = provides; + if (nr_obsoletes > 0) { + patch.obsoletes = obsoletes; + patch.nr_obsoletes = nr_obsoletes; + } +#else + patch.replace = true; +#endif + states[0].id = state; return klp_enable_patch(&patch); } diff --git a/tools/testing/selftests/livepatch/test_modules/test_klp_state2.c b/tools/testing/selftests/livepatch/test_modules/test_klp_state2.c index 5f07fe1be2b9..aeb911b87d37 100644 --- a/tools/testing/selftests/livepatch/test_modules/test_klp_state2.c +++ b/tools/testing/selftests/livepatch/test_modules/test_klp_state2.c @@ -9,10 +9,25 @@ #include #include -#define CONSOLE_LOGLEVEL_STATE 1 /* Version 2 supports migration. */ #define CONSOLE_LOGLEVEL_STATE_VERSION 2 +static unsigned int state = 1; +module_param(state, uint, 0444); +MODULE_PARM_DESC(state, "console loglevel state (default=1)"); + +#ifdef CONFIG_KLP_HAS_PROVIDES +static unsigned int provides; +module_param(provides, uint, 0444); +MODULE_PARM_DESC(provides, "provides id (default=0)"); + +#define KLP_MAX_OBSOLETES 16 +static unsigned int obsoletes[KLP_MAX_OBSOLETES]; +static int nr_obsoletes; +module_param_array(obsoletes, uint, &nr_obsoletes, 0444); +MODULE_PARM_DESC(obsoletes, "obsoletes provides ids"); +#endif + static const char *const module_state[] = { [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state", [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init", @@ -35,14 +50,14 @@ static int allocate_loglevel_state(void) { struct klp_state *loglevel_state, *prev_loglevel_state; - prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE); + prev_loglevel_state = klp_get_prev_state(state); if (prev_loglevel_state) { pr_info("%s: space to store console_loglevel already allocated\n", __func__); return 0; } - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return -EINVAL; @@ -59,11 +74,11 @@ static void fix_console_loglevel(void) { struct klp_state *loglevel_state, *prev_loglevel_state; - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return; - prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE); + prev_loglevel_state = klp_get_prev_state(state); if (prev_loglevel_state) { pr_info("%s: taking over the console_loglevel change\n", __func__); @@ -80,14 +95,14 @@ static void restore_console_loglevel(void) { struct klp_state *loglevel_state, *prev_loglevel_state; - prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE); + prev_loglevel_state = klp_get_prev_state(state); if (prev_loglevel_state) { pr_info("%s: passing the console_loglevel change back to the old livepatch\n", __func__); return; } - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return; @@ -99,14 +114,14 @@ static void free_loglevel_state(void) { struct klp_state *loglevel_state, *prev_loglevel_state; - prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE); + prev_loglevel_state = klp_get_prev_state(state); if (prev_loglevel_state) { pr_info("%s: keeping space to store console_loglevel\n", __func__); return; } - loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE); + loglevel_state = klp_get_state(&patch, state); if (!loglevel_state) return; @@ -162,7 +177,6 @@ static struct klp_object objs[] = { static struct klp_state states[] = { { - .id = CONSOLE_LOGLEVEL_STATE, .version = CONSOLE_LOGLEVEL_STATE_VERSION, }, { } }; @@ -180,6 +194,16 @@ static struct klp_patch patch = { static int test_klp_callbacks_demo_init(void) { +#ifdef CONFIG_KLP_HAS_PROVIDES + patch.provides = provides; + if (nr_obsoletes > 0) { + patch.obsoletes = obsoletes; + patch.nr_obsoletes = nr_obsoletes; + } +#else + patch.replace = true; +#endif + states[0].id = state; return klp_enable_patch(&patch); } -- 2.52.0