linux-hardening - [RFC][PATCH 0/5] slab: Allocate and use per-call-site caches

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Message-Id: <20240809072532.work.266-kees@kernel.org>
Date: Fri,  9 Aug 2024 00:33:01 -0700
From: Kees Cook <kees@...nel.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Kees Cook <kees@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	"GONG, Ruiqi" <gongruiqi@...weicloud.com>,
	Jann Horn <jannh@...gle.com>,
	Matteo Rizzo <matteorizzo@...gle.com>,
	jvoisin <julien.voisin@...tri.org>,
	Xiu Jianfeng <xiujianfeng@...wei.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-hardening@...r.kernel.org
Subject: [RFC][PATCH 0/5] slab: Allocate and use per-call-site caches

Hi,

Here's my current progress on using per-call-site kmalloc caches (instead
of KMALLOC_NORMAL), as a defense against the common heap-grooming attacks
that construct malicious objects in the same cache as a target object.

I'd like to get feedback on the general approach before I continue with
it. I've noted in the later patches what additional improvements I'd
like to make. The first 3 patches are relatively small infrastructure
changes.

Thanks!

-Kees

Kees Cook (5):
  slab: Introduce kmem_buckets_destroy()
  codetag: Run module_load hooks for builtin codetags
  codetag: Introduce codetag_early_walk()
  alloc_tag: Track fixed vs dynamic sized kmalloc calls
  slab: Allocate and use per-call-site caches

 include/linux/alloc_tag.h |  38 +++++++++--
 include/linux/codetag.h   |   2 +
 include/linux/slab.h      |  17 ++---
 lib/alloc_tag.c           | 129 +++++++++++++++++++++++++++++++++++---
 lib/codetag.c             |  21 +++++--
 mm/Kconfig                |  25 ++++++++
 mm/slab_common.c          |  18 +++++-
 mm/slub.c                 |  31 ++++++++-
 8 files changed, 253 insertions(+), 28 deletions(-)

-- 
2.34.1