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keys: prevent slab cache merging for key_jar

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Add SLAB_NO_MERGE to key_jar to prevent the allocator from merging it
with other similarly-sized caches. This hardens struct key isolation by
ensuring dedicated slab pages.

Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Signed-off-by: Mohammed EL Kadiri <med08elkadiri@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20260610065052.9120-1-med08elkadiri@gmail.com
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Mohammed EL Kadiri 2026-06-10 07:50:52 +01:00 committed by Jarkko Sakkinen
parent 44b9597fea
commit 0934c38b12
1 changed files with 1 additions and 1 deletions
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2
security/keys/key.c
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@ -1275,7 +1275,7 @@ void __init key_init(void)
{
/* allocate a slab in which we can store keys */
key_jar = kmem_cache_create("key_jar", sizeof(struct key),
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_NO_MERGE, NULL);
/* add the special key types */
list_add_tail(&key_type_keyring.link, &key_types_list);