linux-kernel - [GIT PULL] slab updates for 6.6

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Message-ID: <eea66c95-8b95-49b1-18f5-5bd92f73f60e@suse.cz>
Date:   Tue, 29 Aug 2023 15:22:37 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, patches@...ts.linux.dev,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Kees Cook <keescook@...omium.org>
Subject: [GIT PULL] slab updates for 6.6

Hi Linus,

please pull the latest slab updates from:

  git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git tags/slab-for-6.6

This happens to be a small one (due to summer I guess), and all hardening
related.

Thanks,
Vlastimil

======================================

* Randomized kmalloc caches, by GONG, Ruiqi.

  A new opt-in hardening feature to make heap spraying harder. It
  creates multiple (16) copies of kmalloc caches, reducing the
  chance of an attacker-controllable allocation site to land in
  the same slab as e.g. an allocation site with use-after-free
  vulnerability. The selection of the copy is derived from the
  allocation site address, including a per-boot random seed.

* Stronger typing for hardened freelists in SLUB, by Jann Horn

  Introduces a custom type for hardened freelist entries instead
  of "void *" as those are not directly dereferencable.
  While reviewing this, I've noticed opportunities for further
  cleanups in that code and added those on top.

----------------------------------------------------------------
GONG, Ruiqi (1):
      Randomized slab caches for kmalloc()

Jann Horn (1):
      mm/slub: refactor freelist to use custom type

Vlastimil Babka (3):
      mm/slub: remove redundant kasan_reset_tag() from freelist_ptr calculations
      mm/slub: remove freelist_dereference()
      Merge branch 'slab/for-6.6/random_kmalloc' into slab/for-next

 include/linux/percpu.h  | 12 +++++++---
 include/linux/slab.h    | 23 +++++++++++++++++---
 mm/Kconfig              | 17 +++++++++++++++
 mm/kfence/kfence_test.c |  7 ++++--
 mm/slab.c               |  2 +-
 mm/slab.h               |  2 +-
 mm/slab_common.c        | 49 ++++++++++++++++++++++++++++++++++++-----
 mm/slub.c               | 58 ++++++++++++++++++++++++++++---------------------
 8 files changed, 130 insertions(+), 40 deletions(-)
~