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mm: Convert check_heap_object() to use struct slab

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Ensure that we're not seeing a tail page inside __check_heap_object() by
converting to a slab instead of a page.  Take the opportunity to mark
the slab as const since we're not modifying it.  Also move the
declaration of __check_heap_object() to mm/slab.h so it's not available
to the wider kernel.

[ vbabka@suse.cz: in check_heap_object() only convert to struct slab for
  actual PageSlab pages; use folio as intermediate step instead of page ]

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Roman Gushchin <guro@fb.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-10-04 14:45:56 +01:00 • committed by Vlastimil Babka
parent 7213230af5
commit 0b3eb091d5
5 changed files with 30 additions and 26 deletions
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11
mm/slab.h
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@ -812,4 +812,15 @@ struct kmem_obj_info {
void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab);
#endif
#ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR
void __check_heap_object(const void *ptr, unsigned long n,
const struct slab *slab, bool to_user);
#else
static inline
void __check_heap_object(const void *ptr, unsigned long n,
const struct slab *slab, bool to_user)
{
}
#endif
#endif /* MM_SLAB_H */