------------[ cut here ]------------ add_uevent_var: buffer size too small WARNING: lib/kobject_uevent.c:688 at add_uevent_var+0x2db/0x460 lib/kobject_uevent.c:688, CPU#0: syz.3.965/10077 Modules linked in: CPU: 0 UID: 0 PID: 10077 Comm: syz.3.965 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:add_uevent_var+0x2db/0x460 lib/kobject_uevent.c:688 Code: 48 8b 44 24 40 42 0f b6 04 38 84 c0 48 8b 5c 24 18 0f 85 73 01 00 00 44 01 33 31 c0 eb 20 e8 dc eb d7 f5 48 8d 3d c5 7f 9e 05 <67> 48 0f b9 3a b8 f4 ff ff ff 49 bf 00 00 00 00 00 fc ff df 66 43 RSP: 0018:ffffc9000e9aea00 EFLAGS: 00010283 RAX: ffffffff8bf10a54 RBX: 1ffff1100f585443 RCX: 0000000000080000 RDX: ffffc90004901000 RSI: 0000000000068345 RDI: ffffffff918f8a20 RBP: ffffc9000e9aeb38 R08: ffff888029fb9f40 R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000002 R12: 0000000000001770 R13: 1ffff92001d35d50 R14: 000000000000079b R15: 0000000000000065 FS: 00007f67a011c6c0(0000) GS:ffff888123a51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a391556c8 CR3: 0000000089380000 CR4: 00000000003526f0 DR0: 0000200000000740 DR1: 0000200000000540 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rfkill_dev_uevent+0x2f/0x1f0 net/rfkill/core.c:875 dev_uevent+0x4ab/0x870 drivers/base/core.c:2774 kobject_uevent_env+0x475/0x9e0 lib/kobject_uevent.c:576 device_add+0x544/0xb80 drivers/base/core.c:3742 rfkill_register+0x170/0x9b0 net/rfkill/core.c:1100 wiphy_register+0x2a5f/0x3290 net/wireless/core.c:1310 ieee80211_register_hw+0x3d72/0x4b30 net/mac80211/main.c:1634 mac80211_hwsim_new_radio+0x32f1/0x5990 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6186 hwsim_new_radio_nl+0xd8b/0xf90 drivers/net/wireless/virtual/mac80211_hwsim_main.c:7062 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2576 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800 __sock_sendmsg net/socket.c:818 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2715 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769 __sys_sendmsg net/socket.c:2801 [inline] __do_sys_sendmsg net/socket.c:2806 [inline] __se_sys_sendmsg net/socket.c:2804 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f679f19f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f67a011c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f679f425fa0 RCX: 00007f679f19f559 RDX: 0000000000000084 RSI: 0000200000000a00 RDI: 0000000000000006 RBP: 00007f679f236b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f679f426038 R14: 00007f679f425fa0 R15: 00007ffd3ecbcfa8 ---------------- Code disassembly (best guess): 0: 48 8b 44 24 40 mov 0x40(%rsp),%rax 5: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax a: 84 c0 test %al,%al c: 48 8b 5c 24 18 mov 0x18(%rsp),%rbx 11: 0f 85 73 01 00 00 jne 0x18a 17: 44 01 33 add %r14d,(%rbx) 1a: 31 c0 xor %eax,%eax 1c: eb 20 jmp 0x3e 1e: e8 dc eb d7 f5 call 0xf5d7ebff 23: 48 8d 3d c5 7f 9e 05 lea 0x59e7fc5(%rip),%rdi # 0x59e7fef * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: b8 f4 ff ff ff mov $0xfffffff4,%eax 34: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 3b: fc ff df 3e: 66 data16 3f: 43 rex.XB