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livepatch: Don't block the removal of patches loaded after a forced transition

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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 <pmladek@suse.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Petr Mladek 2019-01-09 13:43:22 +01:00 • committed by Jiri Kosina
parent 0430f78bf3
commit 68007289bf
4 changed files with 11 additions and 6 deletions
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1
kernel/livepatch/core.h
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@ -5,6 +5,7 @@
#include <linux/livepatch.h>
extern struct mutex klp_mutex;
extern struct list_head klp_patches;
static inline bool klp_is_object_loaded(struct klp_object *obj)
{