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linux/include/net/netns
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Eric Dumazet 3e4bc23926 xfrm: fix a data-race in xfrm_gen_index() 
xfrm_gen_index() mutual exclusion uses net->xfrm.xfrm_policy_lock.

This means we must use a per-netns idx_generator variable,
instead of a static one.
Alternative would be to use an atomic variable.

syzbot reported:

BUG: KCSAN: data-race in xfrm_sk_policy_insert / xfrm_sk_policy_insert

write to 0xffffffff87005938 of 4 bytes by task 29466 on cpu 0:
xfrm_gen_index net/xfrm/xfrm_policy.c:1385 [inline]
xfrm_sk_policy_insert+0x262/0x640 net/xfrm/xfrm_policy.c:2347
xfrm_user_policy+0x413/0x540 net/xfrm/xfrm_state.c:2639
do_ipv6_setsockopt+0x1317/0x2ce0 net/ipv6/ipv6_sockglue.c:943
ipv6_setsockopt+0x57/0x130 net/ipv6/ipv6_sockglue.c:1012
rawv6_setsockopt+0x21e/0x410 net/ipv6/raw.c:1054
sock_common_setsockopt+0x61/0x70 net/core/sock.c:3697
__sys_setsockopt+0x1c9/0x230 net/socket.c:2263
__do_sys_setsockopt net/socket.c:2274 [inline]
__se_sys_setsockopt net/socket.c:2271 [inline]
__x64_sys_setsockopt+0x66/0x80 net/socket.c:2271
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff87005938 of 4 bytes by task 29460 on cpu 1:
xfrm_sk_policy_insert+0x13e/0x640
xfrm_user_policy+0x413/0x540 net/xfrm/xfrm_state.c:2639
do_ipv6_setsockopt+0x1317/0x2ce0 net/ipv6/ipv6_sockglue.c:943
ipv6_setsockopt+0x57/0x130 net/ipv6/ipv6_sockglue.c:1012
rawv6_setsockopt+0x21e/0x410 net/ipv6/raw.c:1054
sock_common_setsockopt+0x61/0x70 net/core/sock.c:3697
__sys_setsockopt+0x1c9/0x230 net/socket.c:2263
__do_sys_setsockopt net/socket.c:2274 [inline]
__se_sys_setsockopt net/socket.c:2271 [inline]
__x64_sys_setsockopt+0x66/0x80 net/socket.c:2271
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00006ad8 -> 0x00006b18

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29460 Comm: syz-executor.1 Not tainted 6.5.0-rc5-syzkaller-00243-g9106536c1aa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023

Fixes: 1121994c80 ("netns xfrm: policy insertion in netns")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2023-09-13 09:20:28 +02:00
..
bpf.h bpf: Invert the dependency between bpf-netns.h and netns/bpf.h 2021-12-29 20:03:05 -08:00
can.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
conntrack.h netfilter: ctnetlink: make event listener tracking global 2023-02-22 00:28:47 +01:00
core.h net: make default_rps_mask a per netns attribute 2023-02-20 11:22:54 +00:00
flow_table.h netfilter: nf_flow_table: count pending offload workqueue tasks 2022-07-11 16:25:14 +02:00
generic.h netns: Replace zero-length array with DECLARE_FLEX_ARRAY() helper 2022-09-28 18:51:47 -07:00
hash.h netns: provide pure entropy for net_hash_mix() 2019-03-28 17:00:45 -07:00
ieee802154_6lowpan.h net: dynamically allocate fqdir structures 2019-05-26 14:08:05 -07:00
ipv4.h tcp: get rid of sysctl_tcp_adv_win_scale 2023-07-18 18:41:18 -07:00
ipv6.h net/ipv6: convert skip_notify_on_dev_down sysctl to u8 2023-06-02 22:55:43 -07:00
mctp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
mib.h net: reorganize fields in netns_mib 2021-04-02 14:31:44 -07:00
mpls.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
netfilter.h Remove DECnet support from kernel 2022-08-22 14:26:30 +01:00
nexthop.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
nftables.h net: Remove leftover include from nftables.h 2023-08-13 14:55:25 +01:00
packet.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sctp.h sctp: add dif and sdif check in asoc and ep lookup 2022-11-18 11:42:54 +00:00
smc.h net/smc: Unbind r/w buffer size from clcsock and make them tunable 2022-09-22 12:58:21 +02:00
unix.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
xdp.h net: xsk: Don't include <linux/rculist.h> 2022-12-06 20:04:34 -08:00
xfrm.h xfrm: fix a data-race in xfrm_gen_index() 2023-09-13 09:20:28 +02:00