linux-hardening - Re: [PATCH v5 4/6] mm/slab: Introduce kmem_buckets

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Message-ID: <202406280846.205B57F@keescook>
Date: Fri, 28 Jun 2024 08:47:28 -0700
From: Kees Cook <kees@...nel.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Vlastimil Babka <vbabka@...e.cz>,
	"GONG, Ruiqi" <gongruiqi@...weicloud.com>,
	Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	jvoisin <julien.voisin@...tri.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>,
	Xiu Jianfeng <xiujianfeng@...wei.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Jann Horn <jannh@...gle.com>, Matteo Rizzo <matteorizzo@...gle.com>,
	Thomas Graf <tgraf@...g.ch>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-hardening@...r.kernel.org, netdev@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v5 4/6] mm/slab: Introduce kmem_buckets_create() and
 family

On Thu, Jun 27, 2024 at 10:35:36PM -0700, Boqun Feng wrote:
> On Thu, Jun 20, 2024 at 10:43:39PM +0200, Vlastimil Babka wrote:
> > Rust people were asking about kmalloc alignment (but I forgot the details)
> 
> It was me! The ask is whether we can specify the alignment for the
> allocation API, for example, requesting a size=96 and align=32 memory,
> or the allocation API could do a "best alignment", for example,
> allocating a size=96 will give a align=32 memory. As far as I
> understand, kmalloc() doesn't support this.

I can drop the "align" argument. Do we want to hard-code a
per-cache-size alignment for the caches in a kmem_buckets collection?

-- 
Kees Cook