* [PATCH v2] cred: prevent slab cache merging for cred_jar
@ 2026-06-11 7:00 Mohammed EL Kadiri
2026-09-09 21:48 ` Paul Moore
0 siblings, 1 reply; 2+ messages in thread
From: Mohammed EL Kadiri @ 2026-06-11 7:00 UTC (permalink / raw)
To: Paul Moore
Cc: Serge Hallyn, Vlastimil Babka, Kees Cook, linux-security-module,
linux-hardening, linux-kernel, Mohammed EL Kadiri
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] cred: prevent slab cache merging for cred_jar
2026-06-11 7:00 [PATCH v2] cred: prevent slab cache merging for cred_jar Mohammed EL Kadiri
@ 2026-09-09 21:48 ` Paul Moore
0 siblings, 0 replies; 2+ messages in thread
From: Paul Moore @ 2026-09-09 21:48 UTC (permalink / raw)
To: Mohammed EL Kadiri
Cc: Serge Hallyn, Vlastimil Babka, Kees Cook, linux-security-module,
linux-hardening, linux-kernel, Mohammed EL Kadiri
On Jun 11, 2026 Mohammed EL Kadiri <med08elkadiri@gmail.com> wrote:
>
> 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(-)
Merged into lsm/dev, thanks!
--
paul-moore.com
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