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mm/slab: remove HAVE_HARDENED_USERCOPY_ALLOCATOR

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With SLOB removed, both remaining allocators support hardened usercopy,
so remove the config and associated #ifdef.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
This commit is contained in:
Vlastimil Babka 2023-05-23 09:26:35 +02:00
parent 8040cbf5e1
commit d2e527f0d8
3 changed files with 0 additions and 18 deletions
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2
mm/Kconfig
View File

@ -221,7 +221,6 @@ choice
config SLAB
bool "SLAB"
depends on !PREEMPT_RT
select HAVE_HARDENED_USERCOPY_ALLOCATOR
help
The regular slab allocator that is established and known to work
well in all environments. It organizes cache hot objects in
@ -229,7 +228,6 @@ config SLAB
config SLUB
bool "SLUB (Unqueued Allocator)"
select HAVE_HARDENED_USERCOPY_ALLOCATOR
help
SLUB is a slab allocator that minimizes cache line usage
instead of managing queues of cached objects (SLAB approach).

8
mm/slab.h
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@ -832,16 +832,8 @@ 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
#ifdef CONFIG_SLUB_DEBUG
void skip_orig_size_check(struct kmem_cache *s, const void *object);

8
security/Kconfig
View File

@ -127,16 +127,8 @@ config LSM_MMAP_MIN_ADDR
this low address space will need the permission specific to the
systems running LSM.
config HAVE_HARDENED_USERCOPY_ALLOCATOR
bool
help
The heap allocator implements __check_heap_object() for
validating memory ranges against heap object sizes in
support of CONFIG_HARDENED_USERCOPY.
config HARDENED_USERCOPY
bool "Harden memory copies between kernel and userspace"
depends on HAVE_HARDENED_USERCOPY_ALLOCATOR
imply STRICT_DEVMEM
help
This option checks for obviously wrong memory regions when