On Fri, Feb 10, 2017 at 4:12 PM, Andrey Konovalov <andreyk...@google.com> wrote: > Hi, > > I've got the following error report while fuzzing the kernel with syzkaller. > > On commit 926af6273fc683cd98cd0ce7bf0d04a02eed6742. > > A reproducer and .config are attached > > kernel BUG at net/core/skbuff.c:105! > invalid opcode: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 2 PID: 6558 Comm: syz-executor4 Not tainted 4.10.0-rc7+ #126 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > task: ffff88003c49c480 task.stack: ffff88003a5c0000 > RIP: 0010:skb_panic+0x16f/0x200 net/core/skbuff.c:101 > RSP: 0018:ffff88003a5c77d0 EFLAGS: 00010286 > RAX: 0000000000000082 RBX: ffff88006be991c0 RCX: 0000000000000000 > RDX: 0000000000000082 RSI: ffffffff814567fc RDI: ffffed00074b8eec > RBP: ffff88003a5c7838 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000002 R11: 0000000000000001 R12: ffffffff85231ee0 > R13: ffffffff834a6722 R14: 0000000000000003 R15: ffff88006c81c580 > FS: 00007f89298c7700(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020ee5000 CR3: 0000000058697000 CR4: 00000000000006e0 > Call Trace: > skb_over_panic net/core/skbuff.c:110 [inline] > skb_put+0x18d/0x1d0 net/core/skbuff.c:1437 > llc_pdu_init_as_xid_cmd include/net/llc_pdu.h:377 [inline] > llc_sap_action_send_xid_c+0x2a2/0x3b0 net/llc/llc_s_ac.c:82 > llc_exec_sap_trans_actions net/llc/llc_sap.c:152 [inline] > llc_sap_next_state net/llc/llc_sap.c:181 [inline] > llc_sap_state_process+0x26b/0x4e0 net/llc/llc_sap.c:212 > llc_build_and_send_xid_pkt+0x19f/0x200 net/llc/llc_sap.c:276 > llc_ui_sendmsg+0xad9/0x1430 net/llc/af_llc.c:938 > sock_sendmsg_nosec net/socket.c:635 [inline] > sock_sendmsg+0xca/0x110 net/socket.c:645 > ___sys_sendmsg+0x9d2/0xae0 net/socket.c:1985 > __sys_sendmsg+0x138/0x320 net/socket.c:2019 > SYSC_sendmsg net/socket.c:2030 [inline] > SyS_sendmsg+0x2d/0x50 net/socket.c:2026 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x4458b9 > RSP: 002b:00007f89298c6b58 EFLAGS: 00000286 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004458b9 > RDX: 0000000000040085 RSI: 0000000020001fc8 RDI: 0000000000000005 > RBP: 00000000006e1ae0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000708000 > R13: ffffffffffffffff R14: 00000000c0206434 R15: 00000000201fcfe0 > Code: 00 00 00 48 89 54 24 10 48 c7 c7 60 19 23 85 48 89 74 24 08 4c > 89 04 24 4c 89 ea 4c 89 7c 24 18 45 89 f0 4c 89 e6 e8 1e c0 38 fe <0f> > 0b 4c 89 4d b8 4c 89 45 c0 48 89 75 c8 48 89 55 d0 e8 6a 5e > RIP: skb_panic+0x16f/0x200 net/core/skbuff.c:101 RSP: ffff88003a5c77d0 > ---[ end trace 89f0ca2ea5bc3ead ]--- > Kernel panic - not syncing: Fatal exception > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds..
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