livepatch: fix deferred module patching order
When applying multiple patches to a module, if the module is loaded
after the patches are loaded, the patches are applied in reverse order:
$ insmod patch1.ko
[ 43.172992] livepatch: enabling patch 'patch1'
$ insmod patch2.ko
[ 46.571563] livepatch: enabling patch 'patch2'
$ modprobe nfsd
[ 52.888922] livepatch: applying patch 'patch2' to loading module 'nfsd'
[ 52.899847] livepatch: applying patch 'patch1' to loading module 'nfsd'
Fix the loading order by storing the klp_patches list in queue order.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index ce42d3b..3d9c00b 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -739,7 +739,7 @@
goto free;
}
- list_add(&patch->list, &klp_patches);
+ list_add_tail(&patch->list, &klp_patches);
mutex_unlock(&klp_mutex);