Merge branch 'for-7.1/module-function-test' into for-linus (448c0f8c) · Commits · git / linux-net

tools/testing/selftests/livepatch/test-livepatch.sh

+100 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,8 @@ MOD_LIVEPATCH1=test_klp_livepatch
		MOD_LIVEPATCH2=test_klp_syscall
		MOD_LIVEPATCH3=test_klp_callbacks_demo
		MOD_REPLACE=test_klp_atomic_replace
		MOD_TARGET=test_klp_mod_target
		MOD_TARGET_PATCH=test_klp_mod_patch

		setup_config

		@@ -196,4 +198,102 @@ livepatch: '$MOD_REPLACE': unpatching complete
		% rmmod $MOD_REPLACE"


		# - load a target module that provides /proc/test_klp_mod_target with
		# original output
		# - load a livepatch that patches the target module's show function
		# - verify the proc entry returns livepatched output
		# - disable and unload the livepatch
		# - verify the proc entry returns original output again
		# - unload the target module

		start_test "module function patching"

		load_mod $MOD_TARGET

		if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; then
		echo -e "FAIL\n\n"
		die "livepatch kselftest(s) failed"
		fi

		load_lp $MOD_TARGET_PATCH

		if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET_PATCH: this has been live patched" ]] ; then
		echo -e "FAIL\n\n"
		die "livepatch kselftest(s) failed"
		fi

		disable_lp $MOD_TARGET_PATCH
		unload_lp $MOD_TARGET_PATCH

		if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; then
		echo -e "FAIL\n\n"
		die "livepatch kselftest(s) failed"
		fi

		unload_mod $MOD_TARGET

		check_result "% insmod test_modules/$MOD_TARGET.ko
		$MOD_TARGET: test_klp_mod_target_init
		% insmod test_modules/$MOD_TARGET_PATCH.ko
		livepatch: enabling patch '$MOD_TARGET_PATCH'
		livepatch: '$MOD_TARGET_PATCH': initializing patching transition
		livepatch: '$MOD_TARGET_PATCH': starting patching transition
		livepatch: '$MOD_TARGET_PATCH': completing patching transition
		livepatch: '$MOD_TARGET_PATCH': patching complete
		% echo 0 > $SYSFS_KLP_DIR/$MOD_TARGET_PATCH/enabled
		livepatch: '$MOD_TARGET_PATCH': initializing unpatching transition
		livepatch: '$MOD_TARGET_PATCH': starting unpatching transition
		livepatch: '$MOD_TARGET_PATCH': completing unpatching transition
		livepatch: '$MOD_TARGET_PATCH': unpatching complete
		% rmmod $MOD_TARGET_PATCH
		% rmmod $MOD_TARGET
		$MOD_TARGET: test_klp_mod_target_exit"


		# - load a livepatch that targets a not-yet-loaded module
		# - load the target module: klp_module_coming patches it immediately
		# - verify the proc entry returns livepatched output
		# - disable and unload the livepatch
		# - verify the proc entry returns original output again
		# - unload the target module

		start_test "module function patching (livepatch first)"

		load_lp $MOD_TARGET_PATCH
		load_mod $MOD_TARGET

		if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET_PATCH: this has been live patched" ]] ; then
		echo -e "FAIL\n\n"
		die "livepatch kselftest(s) failed"
		fi

		disable_lp $MOD_TARGET_PATCH
		unload_lp $MOD_TARGET_PATCH

		if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; then
		echo -e "FAIL\n\n"
		die "livepatch kselftest(s) failed"
		fi

		unload_mod $MOD_TARGET

		check_result "% insmod test_modules/$MOD_TARGET_PATCH.ko
		livepatch: enabling patch '$MOD_TARGET_PATCH'
		livepatch: '$MOD_TARGET_PATCH': initializing patching transition
		livepatch: '$MOD_TARGET_PATCH': starting patching transition
		livepatch: '$MOD_TARGET_PATCH': completing patching transition
		livepatch: '$MOD_TARGET_PATCH': patching complete
		% insmod test_modules/$MOD_TARGET.ko
		livepatch: applying patch '$MOD_TARGET_PATCH' to loading module '$MOD_TARGET'
		$MOD_TARGET: test_klp_mod_target_init
		% echo 0 > $SYSFS_KLP_DIR/$MOD_TARGET_PATCH/enabled
		livepatch: '$MOD_TARGET_PATCH': initializing unpatching transition
		livepatch: '$MOD_TARGET_PATCH': starting unpatching transition
		livepatch: '$MOD_TARGET_PATCH': completing unpatching transition
		livepatch: '$MOD_TARGET_PATCH': unpatching complete
		% rmmod $MOD_TARGET_PATCH
		% rmmod $MOD_TARGET
		$MOD_TARGET: test_klp_mod_target_exit"


		exit 0

tools/testing/selftests/livepatch/test_modules/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,8 @@ obj-m += test_klp_atomic_replace.o \
		test_klp_callbacks_mod.o \
		test_klp_kprobe.o \
		test_klp_livepatch.o \
		test_klp_mod_patch.o \
		test_klp_mod_target.o \
		test_klp_shadow_vars.o \
		test_klp_state.o \
		test_klp_state2.o \

tools/testing/selftests/livepatch/test_modules/test_klp_mod_patch.c

0 → 100644

+53 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (C) 2026 Pablo Hugen <phugen@redhat.com>

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/livepatch.h>
		#include <linux/seq_file.h>

		static int livepatch_mod_target_show(struct seq_file m, void v)
		{
		seq_printf(m, "%s: %s\n", THIS_MODULE->name,
		"this has been live patched");
		return 0;
		}

		static struct klp_func funcs[] = {
		{
		.old_name = "test_klp_mod_target_show",
		.new_func = livepatch_mod_target_show,
		},
		{},
		};

		static struct klp_object objs[] = {
		{
		.name = "test_klp_mod_target",
		.funcs = funcs,
		},
		{},
		};

		static struct klp_patch patch = {
		.mod = THIS_MODULE,
		.objs = objs,
		};

		static int test_klp_mod_patch_init(void)
		{
		return klp_enable_patch(&patch);
		}

		static void test_klp_mod_patch_exit(void)
		{
		}

		module_init(test_klp_mod_patch_init);
		module_exit(test_klp_mod_patch_exit);
		MODULE_LICENSE("GPL");
		MODULE_INFO(livepatch, "Y");
		MODULE_AUTHOR("Pablo Hugen <phugen@redhat.com>");
		MODULE_DESCRIPTION("Livepatch test: patch for module-provided function");

tools/testing/selftests/livepatch/test_modules/test_klp_mod_target.c

0 → 100644

+39 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (C) 2026 Pablo Hugen <phugen@redhat.com>

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/proc_fs.h>
		#include <linux/seq_file.h>

		static struct proc_dir_entry *pde;

		static noinline int test_klp_mod_target_show(struct seq_file m, void v)
		{
		seq_printf(m, "%s: %s\n", THIS_MODULE->name, "original output");
		return 0;
		}

		static int test_klp_mod_target_init(void)
		{
		pr_info("%s\n", __func__);
		pde = proc_create_single("test_klp_mod_target", 0, NULL,
		test_klp_mod_target_show);
		if (!pde)
		return -ENOMEM;
		return 0;
		}

		static void test_klp_mod_target_exit(void)
		{
		pr_info("%s\n", __func__);
		proc_remove(pde);
		}

		module_init(test_klp_mod_target_init);
		module_exit(test_klp_mod_target_exit);
		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Pablo Hugen <phugen@redhat.com>");
		MODULE_DESCRIPTION("Livepatch test: target module with proc entry");