KCSAN: data-race in selinux_socket_post_create / selinux_socket_sock_rcv

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in selinux_socket_post_create / selinux_socket_sock_rcv_skb selinux	6				1	196d	195d	0/29	auto-obsoleted due to no activity on 2025/05/02 11:26
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BUG: KCSAN: data-race in selinux_socket_post_create / selinux_socket_sock_rcv_skb

write to 0xffff8881405e7f90 of 4 bytes by task 11561 on cpu 1:
 selinux_socket_post_create+0x1bf/0x2a0 security/selinux/hooks.c:4835
 security_socket_post_create+0x5d/0xb0 security/security.c:4607
 __sock_create+0x362/0x5b0 net/socket.c:1612
 sock_create net/socket.c:1647 [inline]
 __sys_socket_create net/socket.c:1684 [inline]
 __sys_socket+0xb0/0x180 net/socket.c:1731
 __do_sys_socket net/socket.c:1745 [inline]
 __se_sys_socket net/socket.c:1743 [inline]
 __x64_sys_socket+0x3f/0x50 net/socket.c:1743
 x64_sys_call+0x1147/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:42
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881405e7f90 of 4 bytes by task 11560 on cpu 0:
 selinux_socket_sock_rcv_skb+0x71/0x620 security/selinux/hooks.c:5275
 security_sock_rcv_skb+0x40/0x80 security/security.c:4811
 sk_filter_trim_cap+0xe4/0x420 net/core/filter.c:156
 sk_filter_reason include/linux/filter.h:1089 [inline]
 sock_queue_rcv_skb_reason+0x53/0x120 net/core/sock.c:529
 sock_queue_rcv_skb include/net/sock.h:2465 [inline]
 packet_rcv_spkt+0x2f4/0x3b0 net/packet/af_packet.c:1967
 deliver_skb net/core/dev.c:2472 [inline]
 deliver_ptype_list_skb net/core/dev.c:2487 [inline]
 __netif_receive_skb_core+0x1cd4/0x23b0 net/core/dev.c:5944
 __netif_receive_skb_list_core+0x113/0x500 net/core/dev.c:6066
 __netif_receive_skb_list net/core/dev.c:6133 [inline]
 netif_receive_skb_list_internal+0x487/0x600 net/core/dev.c:6224
 netif_receive_skb_list+0x31/0x200 net/core/dev.c:6276
 xdp_recv_frames net/bpf/test_run.c:280 [inline]
 xdp_test_run_batch net/bpf/test_run.c:361 [inline]
 bpf_test_run_xdp_live+0xdcb/0xfe0 net/bpf/test_run.c:390
 bpf_prog_test_run_xdp+0x4f5/0x910 net/bpf/test_run.c:1322
 bpf_prog_test_run+0x22a/0x390 kernel/bpf/syscall.c:4590
 __sys_bpf+0x4b9/0x7b0 kernel/bpf/syscall.c:6047
 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6137
 x64_sys_call+0x2aea/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000003 -> 0x00000089

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 11560 Comm: syz.1.2756 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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