Commit bb26cfd9 authored by Song Liu's avatar Song Liu Committed by Petr Mladek
Browse files

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: default avatarSong Liu <song@kernel.org>
Reviewed-by: default avatarJoe Lawrence <joe.lawrence@redhat.com>
[pmladek@suse.com: Updated kernel version when the sysfs file will be introduced]
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220902205208.3117798-2-song@kernel.org
parent 033a9441

Documentation/ABI/testing/sysfs-kernel-livepatch

+8 −0
Original line number Diff line number Diff line
@@ -55,6 +55,14 @@ Description: 
		The object directory contains subdirectories for each function

		that is patched within the object.



What:		/sys/kernel/livepatch/<patch>/<object>/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/<patch>/<object>/<function,sympos>

Date:		Nov 2014

KernelVersion:	3.19.0

kernel/livepatch/core.c

+18 −0
Original line number Diff line number Diff line
@@ -325,6 +325,7 @@ int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs, 
 * /sys/kernel/livepatch/<patch>/transition

 * /sys/kernel/livepatch/<patch>/force

 * /sys/kernel/livepatch/<patch>/<object>

 * /sys/kernel/livepatch/<patch>/<object>/patched

 * /sys/kernel/livepatch/<patch>/<object>/<function,sympos>

 */

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)