From: Yafang Shao <laoar.shao@gmail.com>
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 <laoar.shao@gmail.com>
Subject: [PATCH v11 8/9] selftests/livepatch: Add state test for provides/obsoletes
Date: Thu, 8 Oct 2026 17:58:29 +0800 [thread overview]
Message-ID: <20261008095830.26308-9-laoar.shao@gmail.com> (raw)
In-Reply-To: <20261008095830.26308-1-laoar.shao@gmail.com>
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 <pmladek@suse.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
.../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 <linux/printk.h>
#include <linux/livepatch.h>
-#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 <linux/printk.h>
#include <linux/livepatch.h>
-#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
next prev parent reply other threads:[~2026-10-08 9:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-08 9:58 [PATCH v11 0/9] livepatch: Add support for scoped atomic replace Yafang Shao
2026-10-08 9:58 ` [PATCH v11 1/9] selftests/livepatch: Clarify test module file names Yafang Shao
2026-10-08 9:58 ` [PATCH v11 2/9] selftests/livepatch: Adapt atomic replace tests to provides/obsoletes Yafang Shao
2026-10-08 9:58 ` [PATCH v11 3/9] livepatch: Make klp_find_func() non static Yafang Shao
2026-10-08 9:58 ` [PATCH v11 4/9] livepatch: Call klp_init_patch_early() earlier Yafang Shao
2026-10-08 9:58 ` [PATCH v11 5/9] livepatch: Implement provides and obsoletes for scoped atomic replace Yafang Shao
2026-10-08 9:58 ` [PATCH v11 6/9] livepatch: Deprecate stack_order Yafang Shao
2026-10-08 9:58 ` [PATCH v11 7/9] selftests/livepatch: Add provides/obsoletes test scenarios Yafang Shao
2026-10-08 9:58 ` Yafang Shao [this message]
2026-10-08 9:58 ` [PATCH v11 9/9] selftests/livepatch: Add function test for provides/obsoletes Yafang Shao
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