Muchun Song f2a4304e9f mm: kfence: fix using kfence_metadata without initialization in show_object() ... commit 1c86a188e03156223a34d09ce290b49bd4dd0403 upstream. The variable kfence_metadata is initialized in kfence_init_pool(), then, it is not initialized if kfence is disabled after booting. In this case, kfence_metadata will be used (e.g. ->lock and ->state fields) without initialization when reading /sys/kernel/debug/kfence/objects. There will be a warning if you enable CONFIG_DEBUG_SPINLOCK. Fix it by creating debugfs files when necessary. Link: https://lkml.kernel.org/r/20230315034441.44321-1-songmuchun@bytedance.com Fixes: 0ce20dd840 ("mm: add Kernel Electric-Fence infrastructure") Signed-off-by: Muchun Song <songmuchun@bytedance.com> Tested-by: Marco Elver <elver@google.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jann Horn <jannh@google.com> Cc: SeongJae Park <sjpark@amazon.de> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-03-30 12:49:25 +02:00
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.kunitconfig	kfence: test: use new suite_{init/exit} support, add .kunitconfig	2022-05-02 12:35:57 -06:00
core.c	mm: kfence: fix using kfence_metadata without initialization in show_object()	2023-03-30 12:49:25 +02:00
kfence_test.c	Yang Shi has improved the behaviour of khugepaged collapsing of readonly	2022-05-26 12:32:41 -07:00
kfence.h	mm, kfence: support kmem_dump_obj() for KFENCE objects	2022-04-15 14:49:55 -07:00
Makefile	mm/kfence: remove unnecessary CONFIG_KFENCE option	2022-03-22 15:57:11 -07:00
report.c	panic: Consolidate open-coded panic_on_warn checks	2023-01-24 07:24:41 +01:00