syzbot

SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=26823 comm=syz-executor.0
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BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff870d98b4 of 1 bytes by task 26824 on cpu 0:
 vsnprintf+0xdd8/0xe30
 vscnprintf+0x42/0x80 lib/vsprintf.c:2930
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2124
 vprintk_store+0x56f/0x800 kernel/printk/printk.c:2238
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_deferred kernel/printk/printk.c:3945 [inline]
 _printk_deferred+0x83/0xb0 kernel/printk/printk.c:3954
 ___ratelimit+0x293/0x2b0 lib/ratelimit.c:56
 xt_ct_set_helper net/netfilter/xt_CT.c:82 [inline]
 xt_ct_tg_check+0x56d/0x790 net/netfilter/xt_CT.c:203
 xt_ct_tg_check_v0+0xc3/0x130 net/netfilter/xt_CT.c:250
 xt_check_target+0x261/0x480 net/netfilter/x_tables.c:1038
 check_target net/ipv6/netfilter/ip6_tables.c:528 [inline]
 find_check_entry net/ipv6/netfilter/ip6_tables.c:571 [inline]
 translate_table+0xccb/0x1040 net/ipv6/netfilter/ip6_tables.c:733
 do_replace net/ipv6/netfilter/ip6_tables.c:1150 [inline]
 do_ip6t_set_ctl+0x14b3/0x1800 net/ipv6/netfilter/ip6_tables.c:1636
 nf_setsockopt+0x18d/0x1b0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x11c/0x130 net/ipv6/ipv6_sockglue.c:997
 rawv6_setsockopt+0x21e/0x410 net/ipv6/raw.c:1048
 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3715
 do_sock_setsockopt net/socket.c:2311 [inline]
 __sys_setsockopt+0x1d4/0x240 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2340
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff870d98b0 of 8 bytes by task 26823 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x897/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 selinux_netlink_send+0x3fe/0x470 security/selinux/hooks.c:5964
 security_netlink_send+0x3e/0x70 security/security.c:4113
 netlink_sendmsg+0x563/0x770 net/netlink/af_netlink.c:1898
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x1e9/0x270 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000001000061d3 -> 0x000000010a646573

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26823 Comm: syz-executor.0 Not tainted 6.8.0-rc5-syzkaller-00329-gab0a97cffa0b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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