From bb26cfd9e77e8dadd4be2ca154017bde9326cd4b Mon Sep 17 00:00:00 2001 From: Song Liu Date: Fri, 2 Sep 2022 13:52:07 -0700 Subject: [PATCH] livepatch: add sysfs entry "patched" for each klp_object Add per klp_object sysfs entry "patched". It makes it easier to debug typos in the module name. Signed-off-by: Song Liu Reviewed-by: Joe Lawrence [pmladek@suse.com: Updated kernel version when the sysfs file will be introduced] Reviewed-by: Petr Mladek Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20220902205208.3117798-2-song@kernel.org --- Documentation/ABI/testing/sysfs-kernel-livepatch | 8 ++++++++ kernel/livepatch/core.c | 18 ++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-kernel-livepatch b/Documentation/ABI/testing/sysfs-kernel-livepatch index bea7bd5..a5df9b4 100644 --- a/Documentation/ABI/testing/sysfs-kernel-livepatch +++ b/Documentation/ABI/testing/sysfs-kernel-livepatch @@ -55,6 +55,14 @@ Description: The object directory contains subdirectories for each function that is patched within the object. +What: /sys/kernel/livepatch///patched +Date: August 2022 +KernelVersion: 6.1.0 +Contact: live-patching@vger.kernel.org +Description: + An attribute which indicates whether the object is currently + patched. + What: /sys/kernel/livepatch/// Date: Nov 2014 KernelVersion: 3.19.0 diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index bc475e6..67eb9f9 100644 --- a/kernel/livepatch/core.c +++ b/kernel/livepatch/core.c @@ -325,6 +325,7 @@ int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs, * /sys/kernel/livepatch//transition * /sys/kernel/livepatch//force * /sys/kernel/livepatch// + * /sys/kernel/livepatch///patched * /sys/kernel/livepatch/// */ static int __klp_disable_patch(struct klp_patch *patch); @@ -431,6 +432,22 @@ static struct attribute *klp_patch_attrs[] = { }; ATTRIBUTE_GROUPS(klp_patch); +static ssize_t patched_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct klp_object *obj; + + obj = container_of(kobj, struct klp_object, kobj); + return sysfs_emit(buf, "%d\n", obj->patched); +} + +static struct kobj_attribute patched_kobj_attr = __ATTR_RO(patched); +static struct attribute *klp_object_attrs[] = { + &patched_kobj_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(klp_object); + static void klp_free_object_dynamic(struct klp_object *obj) { kfree(obj->name); @@ -576,6 +593,7 @@ static void klp_kobj_release_object(struct kobject *kobj) static struct kobj_type klp_ktype_object = { .release = klp_kobj_release_object, .sysfs_ops = &kobj_sysfs_ops, + .default_groups = klp_object_groups, }; static void klp_kobj_release_func(struct kobject *kobj) -- 2.7.4