From: Mohammed EL Kadiri <med08elkadiri@gmail.com>
To: Paul Moore <paul@paul-moore.com>
Cc: Serge Hallyn <serge@hallyn.com>,
Vlastimil Babka <vbabka@kernel.org>, Kees Cook <kees@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] cred: prevent slab cache merging for cred_jar
Date: Thu, 11 Jun 2026 08:00:54 +0100 [thread overview]
Message-ID: <20260611070054.6550-1-med08elkadiri@gmail.com> (raw)
Add SLAB_NO_MERGE to cred_jar to ensure struct cred objects get
dedicated slab pages, preventing the allocator from merging this
cache with other similarly-sized caches. This is a hardening measure
to provide type isolation for credential objects.
Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Mohammed EL Kadiri <med08elkadiri@gmail.com>
---
Changes in v2:
- Collected Reviewed-by tag from Kees Cook.
- No code changes from v1.
kernel/cred.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/cred.c b/kernel/cred.c
index 9676965c0981..0e4ee60a5acd 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -557,7 +557,7 @@ void __init cred_init(void)
{
/* allocate a slab in which we can store credentials */
cred_jar = KMEM_CACHE(cred,
- SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT);
+ SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT | SLAB_NO_MERGE);
}
/**
--
2.43.0
reply other threads:[~2026-06-11 7:02 UTC|newest]
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