Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752895AbcKZRaf (ORCPT ); Sat, 26 Nov 2016 12:30:35 -0500 Received: from mail-lf0-f41.google.com ([209.85.215.41]:36337 "EHLO mail-lf0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752240AbcKZRa0 (ORCPT ); Sat, 26 Nov 2016 12:30:26 -0500 MIME-Version: 1.0 From: Dmitry Vyukov Date: Sat, 26 Nov 2016 18:30:03 +0100 Message-ID: Subject: net: GPF in eth_header To: David Miller , Tom Herbert , aduyck@mirantis.com, Hannes Frederic Sowa , jbenc@redhat.com, Sabrina Dubroca , netdev , LKML , Eric Dumazet Cc: syzkaller Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3613 Lines: 66 Hello, The following program triggers GPF in eth_header: https://gist.githubusercontent.com/dvyukov/613cadf05543b55a419f237e419cd495/raw/5471231523d1a07c3de55f11f87472c2816ee06c/gistfile1.txt On commit 16ae16c6e5616c084168740990fc508bda6655d4 (Nov 24). BUG: unable to handle kernel paging request at ffffed002d14d74a IP: [] eth_header+0x75/0x260 net/ethernet/eth.c:88 PGD 7fff6067 [ 50.787819] PUD 7fff5067 PMD 0 [ 50.787819] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 2 PID: 6712 Comm: a.out Not tainted 4.9.0-rc6+ #55 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88003a1841c0 task.stack: ffff880034d08000 RIP: 0010:[] [] eth_header+0x75/0x260 net/ethernet/eth.c:88 RSP: 0018:ffff880034d0eb68 EFLAGS: 00010a03 RAX: 1ffff1002d14d74a RBX: ffff880168a6ba4a RCX: ffff88006a9c7858 RDX: 000000000000dd86 RSI: dffffc0000000000 RDI: ffff880168a6ba56 RBP: ffff880034d0eb98 R08: 0000000000000000 R09: 0000000000000031 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88006c208d80 R14: 00000000000086dd R15: ffff88006a9c7858 FS: 0000000001a02940(0000) GS:ffff88006d000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffed002d14d74a CR3: 0000000037373000 CR4: 00000000000006e0 Stack: 000000316881ab40 ffff88006a9c76c0 ffff88006881ab40 ffff88006a9c77f8 0000000000000000 dffffc0000000000 ffff880034d0ee98 ffffffff86b31af9 ffffffff8719605c ffff880034d0f0f8 ffffffff000086dd ffffffff86be3220 Call Trace: [< inline >] dev_hard_header ./include/linux/netdevice.h:2762 [] neigh_resolve_output+0x659/0xb20 net/core/neighbour.c:1302 [< inline >] dst_neigh_output ./include/net/dst.h:464 [] ip6_finish_output2+0xb3c/0x2500 net/ipv6/ip6_output.c:121 [] ip6_finish_output+0x2eb/0x760 net/ipv6/ip6_output.c:139 [< inline >] NF_HOOK_COND ./include/linux/netfilter.h:246 [] ip6_output+0x1d7/0x9a0 net/ipv6/ip6_output.c:153 [< inline >] dst_output ./include/net/dst.h:501 [] ip6_local_out+0x9a/0x180 net/ipv6/output_core.c:170 [] ip6_send_skb+0xa6/0x340 net/ipv6/ip6_output.c:1712 [] ip6_push_pending_frames+0xb8/0xe0 net/ipv6/ip6_output.c:1732 [< inline >] rawv6_push_pending_frames net/ipv6/raw.c:607 [] rawv6_sendmsg+0x250b/0x2c20 net/ipv6/raw.c:920 [] inet_sendmsg+0x385/0x590 net/ipv4/af_inet.c:734 [< inline >] sock_sendmsg_nosec net/socket.c:621 [] sock_sendmsg+0xcf/0x110 net/socket.c:631 [] sock_write_iter+0x32b/0x620 net/socket.c:829 [] do_iter_readv_writev+0x363/0x670 fs/read_write.c:695 [] do_readv_writev+0x431/0x9b0 fs/read_write.c:872 [] vfs_writev+0x8c/0xc0 fs/read_write.c:911 [] do_writev+0x115/0x2d0 fs/read_write.c:944 [< inline >] SYSC_writev fs/read_write.c:1017 [] SyS_writev+0x2c/0x40 fs/read_write.c:1014 [] entry_SYSCALL_64_fastpath+0x23/0xc6 arch/x86/entry/entry_64.S:209 Code: 41 83 fe 04 0f 84 aa 00 00 00 e8 17 4e b0 fa 48 8d 7b 0c 48 be 00 00 00 00 00 fc ff df 44 89 f2 66 c1 c2 08 48 89 f8 48 c1 e8 03 <0f> b6 0c 30 48 8d 43 0d 49 89 c0 49 c1 e8 03 41 0f b6 34 30 49 RIP [] eth_header+0x75/0x260 net/ethernet/eth.c:88 RSP CR2: ffffed002d14d74a ---[ end trace a73fedfdc11bd60c ]---