------------[ 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.7.3999/24082 Modules linked in: CPU: 0 UID: 0 PID: 24082 Comm: syz.7.3999 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 4c 08 cc f5 48 8d 3d 35 f7 d3 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:ffffc9000629ea00 EFLAGS: 00010287 RAX: ffffffff8bfd1c34 RBX: 1ffff11006baa043 RCX: 0000000000080000 RDX: ffffc9000e7a4000 RSI: 000000000006f20e RDI: ffffffff91d11370 RBP: ffffc9000629eb38 R08: ffff888078278000 R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000002 R12: 0000000000000a81 R13: 1ffff92000c53d50 R14: 000000000000079b R15: 0000000000000065 FS: 00007f27cc0b46c0(0000) GS:ffff888123409000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0c3326cef1 CR3: 0000000079464000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 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:3744 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:2584 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: 0033:0x7f27cb19fb19 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:00007f27cc0b4028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f27cb425fa0 RCX: 00007f27cb19fb19 RDX: 0000000000000084 RSI: 0000200000001280 RDI: 0000000000000009 RBP: 00007f27cb237b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f27cb426038 R14: 00007f27cb425fa0 R15: 00007ffcfb56eae8 ---------------- 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 4c 08 cc f5 call 0xf5cc086f 23: 48 8d 3d 35 f7 d3 05 lea 0x5d3f735(%rip),%rdi # 0x5d3f75f * 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