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[v2,0/2] Refine kmalloc caches randomization in kvmalloc

Message ID 20250208014723.1514049-1-gongruiqi1@huawei.com (mailing list archive)
Headers show
Series Refine kmalloc caches randomization in kvmalloc | expand

Message

GONG Ruiqi Feb. 8, 2025, 1:47 a.m. UTC 
Hi,

v2: change the implementation as Vlastimil suggested
v1: https://lore.kernel.org/all/20250122074817.991060-1-gongruiqi1@huawei.com/

Tamás reported [1] that kmalloc cache randomization doesn't actually
work for those kmalloc invoked via kvmalloc. For more details, see the
commit log of patch 2.

The current solution requires a direct call from __kvmalloc_node_noprof
to __do_kmalloc_node, a static function in a different .c file.
Comparing to v1, this version achieves this by simply moving
__kvmalloc_node_noprof to mm/slub.c, as suggested by Vlastimil [2].

Link: https://github.com/google/security-research/pull/83/files#diff-1604319b55a48c39a210ee52034ed7ff5b9cdc3d704d2d9e34eb230d19fae235R200 [1]
Link: https://lore.kernel.org/all/62044279-0c56-4185-97f7-7afac65ff449@suse.cz/ [2]

GONG Ruiqi (2):
  slab: Adjust placement of __kvmalloc_node_noprof
  slab: Achieve better kmalloc caches randomization in kvmalloc

 include/linux/slab.h |  22 +++++++++
 mm/slub.c            |  90 ++++++++++++++++++++++++++++++++++
 mm/util.c            | 112 -------------------------------------------
 3 files changed, 112 insertions(+), 112 deletions(-)