Commit adb68ed2 authored by Yafang Shao's avatar Yafang Shao Committed by Petr Mladek
Browse files

livepatch: Add "replace" sysfs attribute 



There are situations when it might make sense to combine livepatches
with and without the atomic replace on the same system. For example,
the livepatch without the atomic replace might provide a hotfix
or extra tuning.

Managing livepatches on such systems might be challenging. And the
information which of the installed livepatches do not use the atomic
replace would be useful.

Add new sysfs interface 'replace'. It works as follows:

   $ cat /sys/kernel/livepatch/livepatch-non_replace/replace
   0

   $ cat /sys/kernel/livepatch/livepatch-replace/replace
   1

[ commit log improved by Petr ]

Signed-off-by: default avatarYafang Shao <laoar.shao@gmail.com>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Acked-by: default avatarMiroslav Benes <mbenes@suse.cz>
Link: https://lore.kernel.org/r/20240625151123.2750-2-laoar.shao@gmail.com


Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
parent 8c06da67

Documentation/ABI/testing/sysfs-kernel-livepatch

+8 −0
Original line number Diff line number Diff line
@@ -47,6 +47,14 @@ Description: 
		disabled when the feature is used. See

		Documentation/livepatch/livepatch.rst for more information.



What:		/sys/kernel/livepatch/<patch>/replace

Date:		Jun 2024

KernelVersion:	6.11.0

Contact:	live-patching@vger.kernel.org

Description:

		An attribute which indicates whether the patch supports

		atomic-replace.



What:		/sys/kernel/livepatch/<patch>/<object>

Date:		Nov 2014

KernelVersion:	3.19.0

kernel/livepatch/core.c

+12 −0
Original line number Diff line number Diff line
@@ -346,6 +346,7 @@ int klp_apply_section_relocs(struct module *pmod, Elf_Shdr *sechdrs, 
 * /sys/kernel/livepatch/<patch>/enabled

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

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

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

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

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

 * /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
@@ -443,13 +444,24 @@ static ssize_t force_store(struct kobject *kobj, struct kobj_attribute *attr, 
	return count;

}



static ssize_t replace_show(struct kobject *kobj,

			    struct kobj_attribute *attr, char *buf)

{

	struct klp_patch *patch;



	patch = container_of(kobj, struct klp_patch, kobj);

	return sysfs_emit(buf, "%d\n", patch->replace);

}



static struct kobj_attribute enabled_kobj_attr = __ATTR_RW(enabled);

static struct kobj_attribute transition_kobj_attr = __ATTR_RO(transition);

static struct kobj_attribute force_kobj_attr = __ATTR_WO(force);

static struct kobj_attribute replace_kobj_attr = __ATTR_RO(replace);

static struct attribute *klp_patch_attrs[] = {

	&enabled_kobj_attr.attr,

	&transition_kobj_attr.attr,

	&force_kobj_attr.attr,

	&replace_kobj_attr.attr,

	NULL

};

ATTRIBUTE_GROUPS(klp_patch);