From 68007289bf3cd937a5b8fc4987d2787167bd06ca Mon Sep 17 00:00:00 2001 From: Petr Mladek Date: Wed, 9 Jan 2019 13:43:22 +0100 Subject: livepatch: Don't block the removal of patches loaded after a forced transition module_put() is currently never called in klp_complete_transition() when klp_force is set. As a result, we might keep the reference count even when klp_enable_patch() fails and klp_cancel_transition() is called. This might give the impression that a module might get blocked in some strange init state. Fortunately, it is not the case. The reference count is ignored when mod->init fails and erroneous modules are always removed. Anyway, this might be confusing. Instead, this patch moves the global klp_forced flag into struct klp_patch. As a result, we block only modules that might still be in use after a forced transition. Newly loaded livepatches might be eventually completely removed later. It is not a big deal. But the code is at least consistent with the reality. Signed-off-by: Petr Mladek Acked-by: Joe Lawrence Acked-by: Miroslav Benes Acked-by: Josh Poimboeuf Signed-off-by: Jiri Kosina --- kernel/livepatch/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'kernel/livepatch/core.c') diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index 6f0d9095f662..e77c5017ae0c 100644 --- a/kernel/livepatch/core.c +++ b/kernel/livepatch/core.c @@ -45,7 +45,8 @@ */ DEFINE_MUTEX(klp_mutex); -static LIST_HEAD(klp_patches); +/* Registered patches */ +LIST_HEAD(klp_patches); static struct kobject *klp_root_kobj; @@ -659,6 +660,7 @@ static int klp_init_patch_early(struct klp_patch *patch) INIT_LIST_HEAD(&patch->list); patch->kobj_added = false; patch->enabled = false; + patch->forced = false; init_completion(&patch->finish); klp_for_each_object(patch, obj) { -- cgit v1.2.3