From: Mohammed EL Kadiri <med08elkadiri@gmail.com>
To: dhowells@redhat.com, jarkko@kernel.org
Cc: paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com,
kees@kernel.org, vbabka@kernel.org, keyrings@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org,
Mohammed EL Kadiri <med08elkadiri@gmail.com>
Subject: [PATCH v2] keys: prevent slab cache merging for key_jar
Date: Wed, 10 Jun 2026 07:50:52 +0100 [thread overview]
Message-ID: <20260610065052.9120-1-med08elkadiri@gmail.com> (raw)
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>
---
security/keys/key.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/security/keys/key.c b/security/keys/key.c
index 3bbdde778631..592b65cf8539 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -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);
--
2.43.0
next reply other threads:[~2026-06-10 6:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-10 6:50 Mohammed EL Kadiri [this message]
2026-06-10 9:57 ` [PATCH v2] keys: prevent slab cache merging for key_jar Jarkko Sakkinen
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