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linux/net/xdp
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Maciej Fijalkowski 1a6051cd7e xsk: tighten UMEM headroom validation to account for tailroom and min frame 
[ Upstream commit a315e022a7 ]

The current headroom validation in xdp_umem_reg() could leave us with
insufficient space dedicated to even receive minimum-sized ethernet
frame. Furthermore if multi-buffer would come to play then
skb_shared_info stored at the end of XSK frame would be corrupted.

HW typically works with 128-aligned sizes so let us provide this value
as bare minimum.

Multi-buffer setting is known later in the configuration process so
besides accounting for 128 bytes, let us also take care of tailroom space
upfront.

Reviewed-by: Björn Töpel <bjorn@kernel.org>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Fixes: 99e3a236dd ("xsk: Add missing check on user supplied headroom size")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://patch.msgid.link/20260402154958.562179-2-maciej.fijalkowski@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-06-01 17:35:02 +02:00
..
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile xsk: Introduce AF_XDP buffer allocation API 2020-05-21 17:31:26 -07:00
xdp_umem.c xsk: tighten UMEM headroom validation to account for tailroom and min frame 2026-06-01 17:35:02 +02:00
xdp_umem.h xsk: Fix umem cleanup bug at socket destruct 2020-11-20 15:52:39 +01:00
xsk.c net: drop nopreempt requirement on sock_prot_inuse_add() 2024-07-05 09:14:08 +02:00
xsk.h xdp: Add proper __rcu annotations to redirect map entries 2021-06-24 19:41:15 +02:00
xsk_buff_pool.c xsk: Inherit need_wakeup flag for shared sockets 2022-10-12 09:53:26 +02:00
xsk_diag.c xsk: Fix xsk_diag use-after-free error during socket cleanup 2023-09-19 12:22:58 +02:00
xsk_queue.c xsk: Remove MEM_TYPE_ZERO_COPY and corresponding code 2020-05-21 17:31:27 -07:00
xsk_queue.h xsk: Fix unaligned descriptor validation 2023-05-11 23:00:27 +09:00
xskmap.c xsk: fix OOB map writes when deleting elements 2024-12-14 19:51:33 +01:00