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linux/net/kcm
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Junseo Lim b0346dd64e net: kcm: Hold RCU read lock while running BPF parser 
kcm_parse_func_strparser() calls bpf_prog_run_pin_on_cpu() which
prevents CPU migration, but does not establish an RCU read-side
critical section. Consequently, BPF map operations can trigger
WARN_ON_ONCE(!bpf_rcu_lock_held()) when called from the KCM strparser
program.

Hold the RCU read lock while running the program.

Fixes: 9b73896a81 ("kcm: Use stream parser")
Reported-by: Sechang Lim <rhkrqnwk98@gmail.com>
Signed-off-by: Junseo Lim <zirajs7@gmail.com>
Link: https://patch.msgid.link/20260813035136.106167-1-zirajs7@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2026-08-17 13:43:58 -07:00
..
kcmproc.c net: kcm: kcmproc.c: Fix RCU list suspicious usage warning 2020-03-16 17:14:02 -07:00
kcmsock.c net: kcm: Hold RCU read lock while running BPF parser 2026-08-17 13:43:58 -07:00
Kconfig kcm: Fix typo and add hyphen in Kconfig help text 2025-11-18 18:21:04 -08:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00