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1c86a188e0
linux/mm/kfence
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Muchun Song 1c86a188e0 mm: kfence: fix using kfence_metadata without initialization in show_object() 
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>
2023-03-23 17:18:35 -07:00
..
.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() 2023-03-23 17:18:35 -07:00
kfence_test.c treewide: use get_random_u32_inclusive() when possible 2022-11-18 02:18:02 +01:00
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 hardening updates for v6.2-rc1 2022-12-14 12:20:00 -08:00