github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-14 16:10:02 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

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

Browse Source 
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>
This commit is contained in:
Junseo Lim 2026-08-13 12:51:36 +09:00 committed by Jakub Kicinski
parent 33f016b23a
commit b0346dd64e
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/kcm/kcmsock.c
View File

@ -5,6 +5,7 @@
* Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
*/
#include <linux/rcupdate.h>
#include <linux/bpf.h>
#include <linux/errno.h>
#include <linux/errqueue.h>
@ -391,7 +392,9 @@ static int kcm_parse_func_strparser(struct strparser *strp, struct sk_buff *skb)
struct bpf_prog *prog = psock->bpf_prog;
int res;
rcu_read_lock();
res = bpf_prog_run_pin_on_cpu(prog, skb);
rcu_read_unlock();
return res;
}