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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching 

Pull livepatching fix from Jiri Kosina:

 - bugfix for handling of coming modules (incorrect handling of failure)
   from Joe Lawrence

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching:
  livepatch: unpatch all klp_objects if klp_module_coming fails
zero-colors
Linus Torvalds 2017-10-12 09:21:56 -07:00
parent be7484acc6 ef8daf8eeb
commit 0de50ea7b5
1 changed files with 37 additions and 23 deletions
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60
kernel/livepatch/core.c
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@ -830,6 +830,41 @@ int klp_register_patch(struct klp_patch *patch)
}
EXPORT_SYMBOL_GPL(klp_register_patch);
/*
* Remove parts of patches that touch a given kernel module. The list of
* patches processed might be limited. When limit is NULL, all patches
* will be handled.
*/
static void klp_cleanup_module_patches_limited(struct module *mod,
struct klp_patch *limit)
{
struct klp_patch *patch;
struct klp_object *obj;
list_for_each_entry(patch, &klp_patches, list) {
if (patch == limit)
break;
klp_for_each_object(patch, obj) {
if (!klp_is_module(obj) || strcmp(obj->name, mod->name))
continue;
/*
* Only unpatch the module if the patch is enabled or
* is in transition.
*/
if (patch->enabled || patch == klp_transition_patch) {
pr_notice("reverting patch '%s' on unloading module '%s'\n",
patch->mod->name, obj->mod->name);
klp_unpatch_object(obj);
}
klp_free_object_loaded(obj);
break;
}
}
}
int klp_module_coming(struct module *mod)
{
int ret;
@ -894,7 +929,7 @@ err:
pr_warn("patch '%s' failed for module '%s', refusing to load module '%s'\n",
patch->mod->name, obj->mod->name, obj->mod->name);
mod->klp_alive = false;
klp_free_object_loaded(obj);
klp_cleanup_module_patches_limited(mod, patch);
mutex_unlock(&klp_mutex);
return ret;
@ -902,9 +937,6 @@ err:
void klp_module_going(struct module *mod)
{
struct klp_patch *patch;
struct klp_object *obj;
if (WARN_ON(mod->state != MODULE_STATE_GOING &&
mod->state != MODULE_STATE_COMING))
return;
@ -917,25 +949,7 @@ void klp_module_going(struct module *mod)
*/
mod->klp_alive = false;
list_for_each_entry(patch, &klp_patches, list) {
klp_for_each_object(patch, obj) {
if (!klp_is_module(obj) || strcmp(obj->name, mod->name))
continue;
/*
* Only unpatch the module if the patch is enabled or
* is in transition.
*/
if (patch->enabled || patch == klp_transition_patch) {
pr_notice("reverting patch '%s' on unloading module '%s'\n",
patch->mod->name, obj->mod->name);
klp_unpatch_object(obj);
}
klp_free_object_loaded(obj);
break;
}
}
klp_cleanup_module_patches_limited(mod, NULL);
mutex_unlock(&klp_mutex);
}