From: Vlastimil Babka <vbabka@suse.cz>
Date: Tue, 18 Jul 2023 08:16:05 +0000 (+0200)
Subject: Merge branch 'slab/for-6.6/random_kmalloc' into slab/for-next
X-Git-Tag: block-6.6-2023-09-08~17^2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=3d053e8060430b86bad0854b7c7f03f15be3a7e5;p=linux-2.6-block.git

Merge branch 'slab/for-6.6/random_kmalloc' into slab/for-next

Merge the new hardening feature to make heap spraying harder, by GONG,
Ruiqi. 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.

In line with SLAB deprecation, this is a SLUB only feature, incompatible
with SLUB_TINY due to the memory overhead of the extra cache copies.
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3d053e8060430b86bad0854b7c7f03f15be3a7e5