net: kcm: Hold RCU read lock while running BPF parser

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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>

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Junseo Lim 2026-08-13 12:51:36 +09:00 • committed by Jakub Kicinski

parent 33f016b23a

commit b0346dd64e

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net/kcm/kcmsock.c

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