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From: Chris Down <chris@chrisdown.name>
To: Harry Yoo <harry@kernel.org>
Cc: Vlastimil Babka <vbabka@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Hao Li <hao.li@linux.dev>, Christoph Lameter <cl@gentwo.org>,
	David Rientjes <rientjes@google.com>,
	Roman Gushchin <roman.gushchin@linux.dev>,
	Kees Cook <kees@kernel.org>, Marco Elver <elver@google.com>,
	GONG Ruiqi <gongruiqi@huaweicloud.com>,
	Jan Kiszka <jan.kiszka@siemens.com>,
	Kieran Bingham <kbingham@kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-mm@kvack.org, linux-hardening@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	kernel-team@meta.com
Subject: Re: [PATCH 0/8] mm/slab: Support selecting slab hardening features at boot
Date: Wed, 28 Oct 2026 23:27:37 +0800	[thread overview]
Message-ID: <auIUaT6LyEI2cXpj@chrisdown.name> (raw)
In-Reply-To: <auIN44CnAyzvR_Ll@thinkstation>

Hi Harry,

Harry Yoo writes:
>If we end up supporting boot-time parameters for hardening,
>I think it should be all enabled (or disabled) by:
>
>  slab_hardening=none|light|full
>  # please feel free to suggest bertter names
>
>none: "Turn of all of them to maximize performance"
>
>light: "I'm willying to sacrifice _some_ memory and CPU for security"
>
>full: "I'm willying to sacrifice more overhead for security
>
>IMHO more fine-grained knob for each feature doesn't make much sense.

I think if we did the 4 knobs that is a good idea. Given now it's two, I think 
it seems reasonable to keep it as two separate knobs unless you object?  
Otherwise I think given it will only cover the latter two, it should be 
something like kmalloc_isolation= instead. Let me know what you think.

Thanks!

  reply	other threads:[~2026-10-28 15:27 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-27  7:35 Chris Down
2026-10-27  7:35 ` [PATCH 1/8] mm/slub: Support disabling freelist hardening " Chris Down
2026-10-27  7:35 ` [PATCH 2/8] slub_kunit: Add a test for slab_freelist_hardened= Chris Down
2026-10-27  7:35 ` [PATCH 3/8] mm/slub: Support disabling freelist randomisation at boot Chris Down
2026-10-27  7:35 ` [PATCH 4/8] slub_kunit: Add a test for slab_freelist_random= Chris Down
2026-10-27  7:35 ` [PATCH 5/8] mm/slab: Support disabling SLAB_BUCKETS at boot Chris Down
2026-10-27  7:36 ` [PATCH 6/8] slub_kunit: Add a test for the slab_buckets boot parameter Chris Down
2026-10-27  7:36 ` [PATCH 7/8] mm/slab: Support disabling KMALLOC_PARTITION_CACHES at boot Chris Down
2026-10-27  7:36 ` [PATCH 8/8] slub_kunit: Add a test for the kmalloc_partition boot parameter Chris Down
2026-10-27  8:10 ` [PATCH 0/8] mm/slab: Support selecting slab hardening features at boot Vlastimil Babka (SUSE)
2026-10-27 18:31   ` Harry Yoo
2026-10-28 15:23   ` Chris Down
2026-10-28 15:06 ` Harry Yoo
2026-10-28 15:27   ` Chris Down [this message]
2026-10-28 15:37     ` Harry Yoo

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