Re: [PATCH 1/1] selftests: livepatch: add test cases of stack_order sysfs interface
From: Marcos Paulo de Souza
Date: Thu Oct 10 2024 - 08:32:24 EST
On Tue, 2024-10-08 at 15:52 +0800, Wardenjohn wrote:
> Add selftest test cases to sysfs attribute 'stack_order'.
>
> Signed-off-by: Wardenjohn <zhangwarden@xxxxxxxxx>
> ---
> .../testing/selftests/livepatch/test-sysfs.sh | 71
> +++++++++++++++++++
> .../selftests/livepatch/test_modules/Makefile | 5 +-
> .../test_klp_livepatch_noreplace.c | 53 ++++++++++++++
> .../test_klp_livepatch_noreplace2.c | 53 ++++++++++++++
> .../test_klp_livepatch_noreplace3.c | 53 ++++++++++++++
> 5 files changed, 234 insertions(+), 1 deletion(-)
> create mode 100644
> tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_nor
> eplace.c
> create mode 100644
> tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_nor
> eplace2.c
> create mode 100644
> tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_nor
> eplace3.c
IIUC, you only need to test the stack order by loading LP modules. In
this case you could use our currently existing LP testing module for
that, right? That's what we currently do when testing different sysfs
attributes.
>
> diff --git a/tools/testing/selftests/livepatch/test-sysfs.sh
> b/tools/testing/selftests/livepatch/test-sysfs.sh
> index 05a14f5a7bfb..a086b62fb488 100755
> --- a/tools/testing/selftests/livepatch/test-sysfs.sh
> +++ b/tools/testing/selftests/livepatch/test-sysfs.sh
> @@ -5,6 +5,9 @@
> . $(dirname $0)/functions.sh
>
> MOD_LIVEPATCH=test_klp_livepatch
> +MOD_LIVEPATCH_NOREPLACE=test_klp_livepatch_noreplace
> +MOD_LIVEPATCH_NOREPLACE2=test_klp_livepatch_noreplace2
> +MOD_LIVEPATCH_NOREPLACE3=test_klp_livepatch_noreplace3
>
> setup_config
>
> @@ -131,4 +134,72 @@ livepatch: '$MOD_LIVEPATCH': completing
> unpatching transition
> livepatch: '$MOD_LIVEPATCH': unpatching complete
> % rmmod $MOD_LIVEPATCH"
>
> +start_test "sysfs test stack_order read"
> +
> +load_lp $MOD_LIVEPATCH_NOREPLACE
> +
> +check_sysfs_rights "$MOD_LIVEPATCH_NOREPLACE" "stack_order" "-r--r--
> r--"
> +check_sysfs_value "$MOD_LIVEPATCH_NOREPLACE" "stack_order" "1"
> +
> +load_lp $MOD_LIVEPATCH_NOREPLACE2
> +
> +check_sysfs_rights "$MOD_LIVEPATCH_NOREPLACE2" "stack_order" "-r--r-
> -r--"
> +check_sysfs_value "$MOD_LIVEPATCH_NOREPLACE2" "stack_order" "2"
> +
> +load_lp $MOD_LIVEPATCH_NOREPLACE3
> +
> +check_sysfs_rights "$MOD_LIVEPATCH_NOREPLACE3" "stack_order" "-r--r-
> -r--"
> +check_sysfs_value "$MOD_LIVEPATCH_NOREPLACE3" "stack_order" "3"
> +
> +disable_lp $MOD_LIVEPATCH_NOREPLACE2
> +unload_lp $MOD_LIVEPATCH_NOREPLACE2
> +
> +check_sysfs_rights "$MOD_LIVEPATCH_NOREPLACE" "stack_order" "-r--r--
> r--"
> +check_sysfs_value "$MOD_LIVEPATCH_NOREPLACE" "stack_order" "1"
> +check_sysfs_rights "$MOD_LIVEPATCH_NOREPLACE3" "stack_order" "-r--r-
> -r--"
> +check_sysfs_value "$MOD_LIVEPATCH_NOREPLACE3" "stack_order" "2"
> +
> +disable_lp $MOD_LIVEPATCH_NOREPLACE3
> +unload_lp $MOD_LIVEPATCH_NOREPLACE3
> +
> +disable_lp $MOD_LIVEPATCH_NOREPLACE
> +unload_lp $MOD_LIVEPATCH_NOREPLACE
> +
> +check_result "% insmod test_modules/$MOD_LIVEPATCH_NOREPLACE.ko
> +livepatch: enabling patch '$MOD_LIVEPATCH_NOREPLACE'
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': initializing patching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': starting patching transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': completing patching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': patching complete
> +% insmod test_modules/$MOD_LIVEPATCH_NOREPLACE2.ko
> +livepatch: enabling patch '$MOD_LIVEPATCH_NOREPLACE2'
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': initializing patching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': starting patching transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': completing patching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': patching complete
> +% insmod test_modules/$MOD_LIVEPATCH_NOREPLACE3.ko
> +livepatch: enabling patch '$MOD_LIVEPATCH_NOREPLACE3'
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': initializing patching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': starting patching transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': completing patching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': patching complete
> +% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH_NOREPLACE2/enabled
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': initializing unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': starting unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': completing unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE2': unpatching complete
> +% rmmod $MOD_LIVEPATCH_NOREPLACE2
> +% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH_NOREPLACE3/enabled
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': initializing unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': starting unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': completing unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE3': unpatching complete
> +% rmmod $MOD_LIVEPATCH_NOREPLACE3
> +% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH_NOREPLACE/enabled
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': initializing unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': starting unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': completing unpatching
> transition
> +livepatch: '$MOD_LIVEPATCH_NOREPLACE': unpatching complete
> +% rmmod $MOD_LIVEPATCH_NOREPLACE"
> +
> exit 0
> diff --git a/tools/testing/selftests/livepatch/test_modules/Makefile
> b/tools/testing/selftests/livepatch/test_modules/Makefile
> index e6e638c4bcba..dad6ca00d3e6 100644
> --- a/tools/testing/selftests/livepatch/test_modules/Makefile
> +++ b/tools/testing/selftests/livepatch/test_modules/Makefile
> @@ -11,7 +11,10 @@ obj-m += test_klp_atomic_replace.o \
> test_klp_state2.o \
> test_klp_state3.o \
> test_klp_shadow_vars.o \
> - test_klp_syscall.o
> + test_klp_syscall.o \
> + test_klp_livepatch_noreplace.o \
> + test_klp_livepatch_noreplace2.o \
> + test_klp_livepatch_noreplace3.o \
>
> # Ensure that KDIR exists, otherwise skip the compilation
> modules:
> diff --git
> a/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace.c
> b/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace.c
> new file mode 100644
> index 000000000000..ead609aeac67
> --- /dev/null
> +++
> b/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace.c
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2014 Seth Jennings <sjenning@xxxxxxxxxx>
> +
> +#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_cmdline_proc_show(struct seq_file *m, void *v)
> +{
> + seq_printf(m, "%s: %s\n", THIS_MODULE->name,
> + "this has been live patched with number 1");
> + return 0;
> +}
> +
> +static struct klp_func funcs[] = {
> + {
> + .old_name = "cmdline_proc_show",
> + .new_func = livepatch_cmdline_proc_show,
> + }, { }
> +};
> +
> +static struct klp_object objs[] = {
> + {
> + /* name being NULL means vmlinux */
> + .funcs = funcs,
> + }, { }
> +};
> +
> +static struct klp_patch patch = {
> + .mod = THIS_MODULE,
> + .objs = objs,
> + .replace = false,
> +};
> +
> +static int test_klp_livepatch_init(void)
> +{
> + return klp_enable_patch(&patch);
> +}
> +
> +static void test_klp_livepatch_exit(void)
> +{
> +}
> +
> +module_init(test_klp_livepatch_init);
> +module_exit(test_klp_livepatch_exit);
> +MODULE_LICENSE("GPL");
> +MODULE_INFO(livepatch, "Y");
> +MODULE_AUTHOR("Seth Jennings <sjenning@xxxxxxxxxx>");
> +MODULE_AUTHOR("Wardenjohn <zhangwarden@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Livepatch test: livepatch module");
> diff --git
> a/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace2.c
> b/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace2.c
> new file mode 100644
> index 000000000000..8d54b0976be1
> --- /dev/null
> +++
> b/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace2.c
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2014 Seth Jennings <sjenning@xxxxxxxxxx>
> +
> +#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_cmdline_proc_show(struct seq_file *m, void *v)
> +{
> + seq_printf(m, "%s: %s\n", THIS_MODULE->name,
> + "this has been live patched with number 2");
> + return 0;
> +}
> +
> +static struct klp_func funcs[] = {
> + {
> + .old_name = "cmdline_proc_show",
> + .new_func = livepatch_cmdline_proc_show,
> + }, { }
> +};
> +
> +static struct klp_object objs[] = {
> + {
> + /* name being NULL means vmlinux */
> + .funcs = funcs,
> + }, { }
> +};
> +
> +static struct klp_patch patch = {
> + .mod = THIS_MODULE,
> + .objs = objs,
> + .replace = false,
> +};
> +
> +static int test_klp_livepatch_init(void)
> +{
> + return klp_enable_patch(&patch);
> +}
> +
> +static void test_klp_livepatch_exit(void)
> +{
> +}
> +
> +module_init(test_klp_livepatch_init);
> +module_exit(test_klp_livepatch_exit);
> +MODULE_LICENSE("GPL");
> +MODULE_INFO(livepatch, "Y");
> +MODULE_AUTHOR("Seth Jennings <sjenning@xxxxxxxxxx>");
> +MODULE_AUTHOR("Wardenjohn <zhangwarden@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Livepatch test: livepatch module");
> diff --git
> a/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace3.c
> b/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace3.c
> new file mode 100644
> index 000000000000..a267c58e07d4
> --- /dev/null
> +++
> b/tools/testing/selftests/livepatch/test_modules/test_klp_livepatch_n
> oreplace3.c
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2014 Seth Jennings <sjenning@xxxxxxxxxx>
> +
> +#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_cmdline_proc_show(struct seq_file *m, void *v)
> +{
> + seq_printf(m, "%s: %s\n", THIS_MODULE->name,
> + "this has been live patched with number 3");
> + return 0;
> +}
> +
> +static struct klp_func funcs[] = {
> + {
> + .old_name = "cmdline_proc_show",
> + .new_func = livepatch_cmdline_proc_show,
> + }, { }
> +};
> +
> +static struct klp_object objs[] = {
> + {
> + /* name being NULL means vmlinux */
> + .funcs = funcs,
> + }, { }
> +};
> +
> +static struct klp_patch patch = {
> + .mod = THIS_MODULE,
> + .objs = objs,
> + .replace = false,
> +};
> +
> +static int test_klp_livepatch_init(void)
> +{
> + return klp_enable_patch(&patch);
> +}
> +
> +static void test_klp_livepatch_exit(void)
> +{
> +}
> +
> +module_init(test_klp_livepatch_init);
> +module_exit(test_klp_livepatch_exit);
> +MODULE_LICENSE("GPL");
> +MODULE_INFO(livepatch, "Y");
> +MODULE_AUTHOR("Seth Jennings <sjenning@xxxxxxxxxx>");
> +MODULE_AUTHOR("Wardenjohn <zhangwarden@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Livepatch test: livepatch module");