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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 <song@kernel.org>
Reviewed-by: Joe Lawrence <joe.lawrence@redhat.com>
[pmladek@suse.com: Updated kernel version when the sysfs file will be introduced]
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220902205208.3117798-2-song@kernel.org
This commit is contained in:
Song Liu 2022-09-02 13:52:07 -07:00 committed by Petr Mladek
parent 033a94412b
commit bb26cfd9e7
2 changed files with 26 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-kernel-livepatch
View File

@ -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

18
kernel/livepatch/core.c
View File

@ -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)