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| author | Petr Mladek <pmladek@suse.com> | 2017-04-11 13:07:48 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2017-04-11 20:54:27 +0200 |
| commit | e679af627fe875a51d40b9a2b17f08fbde36e0e2 (patch) | |
| tree | fb42666cf8009e2569607e12636ade178fae0a48 /kernel/livepatch | |
| parent | livepatch: make klp_mutex proper part of API (diff) | |
| download | linux-e679af627fe875a51d40b9a2b17f08fbde36e0e2.tar.xz linux-e679af627fe875a51d40b9a2b17f08fbde36e0e2.zip | |
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')
| -rw-r--r-- | kernel/livepatch/transition.c | 20 |
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); } /* |