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authorPetr Mladek <pmladek@suse.com>2017-04-11 14:07:48 +0300
committerJiri Kosina <jkosina@suse.cz>2017-04-11 21:54:27 +0300
commite679af627fe875a51d40b9a2b17f08fbde36e0e2 (patch)
treefb42666cf8009e2569607e12636ade178fae0a48 /kernel/livepatch/transition.c
parent10517429b5ac242498d7d847f79f10c21d7eedb0 (diff)
downloadlinux-e679af627fe875a51d40b9a2b17f08fbde36e0e2.tar.xz
livepatch: Cancel transition a safe way for immediate patches
klp_init_transition() does not set func->transition for immediate patches. Then klp_ftrace_handler() could use the new code immediately. As a result, it is not safe to put the livepatch module in klp_cancel_transition(). This patch reverts most of the last minute changes klp_cancel_transition(). It keeps the warning about a misuse because it still makes sense. Fixes: 3ec24776bfd0 ("livepatch: allow removal of a disabled patch") Signed-off-by: Petr Mladek <pmladek@suse.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'kernel/livepatch/transition.c')
-rw-r--r--kernel/livepatch/transition.c20
1 files changed, 0 insertions, 20 deletions
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index 2de09e0c4e5c..adc0cc64aa4b 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -120,31 +120,11 @@ done:
*/
void klp_cancel_transition(void)
{
- struct klp_patch *patch = klp_transition_patch;
- struct klp_object *obj;
- struct klp_func *func;
- bool immediate_func = false;
-
if (WARN_ON_ONCE(klp_target_state != KLP_PATCHED))
return;
klp_target_state = KLP_UNPATCHED;
klp_complete_transition();
-
- /*
- * In the enable error path, even immediate patches can be safely
- * removed because the transition hasn't been started yet.
- *
- * klp_complete_transition() doesn't have a module_put() for immediate
- * patches, so do it here.
- */
- klp_for_each_object(patch, obj)
- klp_for_each_func(obj, func)
- if (func->immediate)
- immediate_func = true;
-
- if (patch->immediate || immediate_func)
- module_put(patch->mod);
}
/*