diff options
| author | Petr Mladek <pmladek@suse.com> | 2019-10-30 16:43:09 +0100 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2019-11-01 13:08:08 +0100 |
| commit | 7e35e4eb7e56233dcf445992d7b835a9ba93408e (patch) | |
| tree | 37f5a3373196c3c9819a62b5e12f5e033eaf4173 /kernel/livepatch/core.h | |
| parent | 9f7582d15f82e86b2041ab22327b7d769e061c1f (diff) | |
livepatch: Keep replaced patches until post_patch callback is called
Pre/post (un)patch callbacks might manipulate the system state. Cumulative
livepatches might need to take over the changes made by the replaced
ones. For this they might need to access some data stored or referenced
by the old livepatches.
Therefore the replaced livepatches have to stay around until post_patch()
callback is called. It is achieved by calling the free functions later.
It is the same location where disabled livepatches have already been
freed.
Link: http://lkml.kernel.org/r/20191030154313.13263-2-pmladek@suse.com
To: Jiri Kosina <jikos@kernel.org>
Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: live-patching@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'kernel/livepatch/core.h')
| -rw-r--r-- | kernel/livepatch/core.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/livepatch/core.h b/kernel/livepatch/core.h index ec43a40b853f..38209c7361b6 100644 --- a/kernel/livepatch/core.h +++ b/kernel/livepatch/core.h @@ -13,8 +13,9 @@ extern struct list_head klp_patches; #define klp_for_each_patch(patch) \ list_for_each_entry(patch, &klp_patches, list) -void klp_free_patch_start(struct klp_patch *patch); -void klp_discard_replaced_patches(struct klp_patch *new_patch); +void klp_free_patch_async(struct klp_patch *patch); +void klp_free_replaced_patches_async(struct klp_patch *new_patch); +void klp_unpatch_replaced_patches(struct klp_patch *new_patch); void klp_discard_nops(struct klp_patch *new_patch); static inline bool klp_is_object_loaded(struct klp_object *obj) |