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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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8
include/linux/slab.h
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@@ -189,14 +189,6 @@ bool kmem_valid_obj(void *object);
void kmem_dump_obj(void *object);
#endif
#ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR
void __check_heap_object(const void *ptr, unsigned long n, struct page *page,
bool to_user);
#else
static inline void __check_heap_object(const void *ptr, unsigned long n,
struct page *page, bool to_user) { }
#endif
/*
* Some archs want to perform DMA into kmalloc caches and need a guaranteed
* alignment larger than the alignment of a 64-bit integer.