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 TOG4TDos 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/29/24 2:19 PM, Rik van Riel wrote: > In 782f8906f805 the freeing of kfence objects was moved from deep > inside do_free_slab to the wrapper functions outside. This is a nice > change, but unfortunately it missed one spot in __kmem_cache_free_bulk. > > This results in a crash like this: > > BUG skbuff_head_cache (Tainted: G S B E ): Padding overwritten. 0xffff88907fea0f00-0xffff88907fea0fff @offset=3840 > > slab_err (mm/slub.c:1129) > free_to_partial_list (mm/slub.c:? mm/slub.c:4036) > slab_pad_check (mm/slub.c:864 mm/slub.c:1290) > check_slab (mm/slub.c:?) > free_to_partial_list (mm/slub.c:3171 mm/slub.c:4036) > kmem_cache_alloc_bulk (mm/slub.c:? mm/slub.c:4495 mm/slub.c:4586 mm/slub.c:4635) > napi_build_skb (net/core/skbuff.c:348 net/core/skbuff.c:527 net/core/skbuff.c:549) > > All the other callers to do_free_slab appear to be ok. > > Add a kfence_free check in __kmem_cache_free_bulk to avoid the crash. > > Reported-by: Chris Mason > Fixes: 782f8906f805 ("mm/slub: free KFENCE objects in slab_free_hook()") > Cc: stable@kernel.org > Signed-off-by: Rik van Riel We found this after bisecting a slab corruption down to the kfence patch, and with this patch applied we're no longer falling over. So thanks Rik! -chris