Yun Lu b97d5eedf4 netdevsim: fix a race issue related to the operation on bpf_bound_progs list ... The netdevsim driver lacks a protection mechanism for operations on the bpf_bound_progs list. When the nsim_bpf_create_prog() performs list_add_tail, it is possible that nsim_bpf_destroy_prog() is simultaneously performs list_del. Concurrent operations on the list may lead to list corruption and trigger a kernel crash as follows: [ 417.290971] kernel BUG at lib/list_debug.c:62! [ 417.290983] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [ 417.290992] CPU: 10 PID: 168 Comm: kworker/10:1 Kdump: loaded Not tainted 6.19.0-rc5 #1 [ 417.291003] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 417.291007] Workqueue: events bpf_prog_free_deferred [ 417.291021] RIP: 0010:__list_del_entry_valid_or_report+0xa7/0xc0 [ 417.291034] Code: a8 ff 0f 0b 48 89 fe 48 89 ca 48 c7 c7 48 a1 eb ae e8 ed fb a8 ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 80 a1 eb ae e8 d9 fb a8 ff <0f> 0b 48 89 d1 48 c7 c7 d0 a1 eb ae 48 89 f2 48 89 c6 e8 c2 fb a8 [ 417.291040] RSP: 0018:ffffb16a40807df8 EFLAGS: 00010246 [ 417.291046] RAX: 000000000000006d RBX: ffff8e589866f500 RCX: 0000000000000000 [ 417.291051] RDX: 0000000000000000 RSI: ffff8e59f7b23180 RDI: ffff8e59f7b23180 [ 417.291055] RBP: ffffb16a412c9000 R08: 0000000000000000 R09: 0000000000000003 [ 417.291059] R10: ffffb16a40807c80 R11: ffffffffaf9edce8 R12: ffff8e594427ac20 [ 417.291063] R13: ffff8e59f7b44780 R14: ffff8e58800b7a05 R15: 0000000000000000 [ 417.291074] FS: 0000000000000000(0000) GS:ffff8e59f7b00000(0000) knlGS:0000000000000000 [ 417.291079] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 417.291083] CR2: 00007fc4083efe08 CR3: 00000001c3626006 CR4: 0000000000770ee0 [ 417.291088] PKRU: 55555554 [ 417.291091] Call Trace: [ 417.291096] <TASK> [ 417.291103] nsim_bpf_destroy_prog+0x31/0x80 [netdevsim] [ 417.291154] __bpf_prog_offload_destroy+0x2a/0x80 [ 417.291163] bpf_prog_dev_bound_destroy+0x6f/0xb0 [ 417.291171] bpf_prog_free_deferred+0x18e/0x1a0 [ 417.291178] process_one_work+0x18a/0x3a0 [ 417.291188] worker_thread+0x27b/0x3a0 [ 417.291197] ? __pfx_worker_thread+0x10/0x10 [ 417.291207] kthread+0xe5/0x120 [ 417.291214] ? __pfx_kthread+0x10/0x10 [ 417.291221] ret_from_fork+0x31/0x50 [ 417.291230] ? __pfx_kthread+0x10/0x10 [ 417.291236] ret_from_fork_asm+0x1a/0x30 [ 417.291246] </TASK> Add a mutex lock, to prevent simultaneous addition and deletion operations on the list. Fixes: 31d3ad8329 ("netdevsim: add bpf offload support") Reported-by: Yinhao Hu <dddddd@hust.edu.cn> Reported-by: Kaiyan Mei <M202472210@hust.edu.cn> Signed-off-by: Yun Lu <luyun@kylinos.cn> Link: https://patch.msgid.link/20260116095308.11441-1-luyun_611@163.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>		2026-01-20 17:18:52 +01:00
..
Makefile	netdevsim: a basic test PSP implementation	2025-09-30 15:17:21 +02:00
bpf.c	netdevsim: fix a race issue related to the operation on bpf_bound_progs list	2026-01-20 17:18:52 +01:00
bus.c	net: netdevsim: fix inconsistent carrier state after link/unlink	2026-01-06 18:04:00 -08:00
dev.c	netdevsim: fix a race issue related to the operation on bpf_bound_progs list	2026-01-20 17:18:52 +01:00
ethtool.c	ethtool: add FEC bins histogram report	2025-09-26 16:49:18 -07:00
fib.c	netdevsim: Add trailing zero to terminate the string in nsim_nexthop_bucket_activity_write()	2024-10-29 11:43:01 -07:00
health.c	devlink: Move graceful period parameter to reporter ops	2025-08-26 17:24:16 -07:00
hwstats.c	netdevsim: remove redundant branch	2025-07-17 18:09:27 -07:00
ipsec.c	netdevsim: add ipsec hw_features	2025-10-16 15:44:32 -07:00
macsec.c	netdevsim: macsec: pad u64 to correct length in logs	2024-10-23 09:51:06 +02:00
netdev.c	netdevsim: add loopback support	2025-11-20 18:19:30 -08:00
netdevsim.h	netdevsim: fix a race issue related to the operation on bpf_bound_progs list	2026-01-20 17:18:52 +01:00
psample.c	…
psp.c	netdevsim: implement psp device stats	2025-11-07 18:53:57 -08:00
udp_tunnels.c	netdevsim: remove udp_ports_sleep	2025-06-18 18:53:51 -07:00