Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751257AbeACSxH (ORCPT + 1 other); Wed, 3 Jan 2018 13:53:07 -0500 Received: from mail-io0-f171.google.com ([209.85.223.171]:46354 "EHLO mail-io0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750979AbeACSxE (ORCPT ); Wed, 3 Jan 2018 13:53:04 -0500 X-Google-Smtp-Source: ACJfBouuiZPJGyPr0Q21/pmRL2G39jzVEJTvfRO587B//iEQYRcpo7JqzIcOznnrNvRiCJh+RP05QYjdUeNl347dSAU= MIME-Version: 1.0 In-Reply-To: References: <001a1145e85edcbf2d0561d3075c@google.com> From: Wei Wang Date: Wed, 3 Jan 2018 10:53:02 -0800 Message-ID: Subject: Re: general protection fault in fib6_add (2) To: David Ahern Cc: syzbot , "David S . Miller" , Alexey Kuznetsov , lkml , Linux Kernel Network Developers , syzkaller-bugs@googlegroups.com, Hideaki YOSHIFUJI Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Wed, Jan 3, 2018 at 8:16 AM, David Ahern wrote: > [ +weiwan@google.com ] > > On 1/2/18 3:58 PM, syzbot wrote: >> Hello, >> >> syzkaller hit the following crash on >> 61233580f1f33c50e159c50e24d80ffd2ba2e06b >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master >> compiler: gcc (GCC) 7.1.1 20170620 >> .config is attached >> Raw console output is attached. >> C reproducer is attached >> syzkaller reproducer is attached. See https://goo.gl/kgGztJ >> for information about syzkaller reproducers >> >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+0693adff3f83403dc5da@syzkaller.appspotmail.com >> It will help syzbot understand when the bug is fixed. See footer for >> details. >> If you forward the report, please keep this part and the footer. >> >> audit: type=1400 audit(1514594846.496:7): avc: denied { map } for >> pid=3201 comm="syzkaller001778" path="/root/syzkaller001778299" >> dev="sda1" ino=16481 >> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 >> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 >> IPv6: Can't replace route, no match found >> kasan: CONFIG_KASAN_INLINE enabled >> kasan: GPF could be caused by NULL-ptr deref or user memory access >> general protection fault: 0000 [#1] SMP KASAN >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Modules linked in: >> CPU: 0 PID: 3201 Comm: syzkaller001778 Not tainted 4.15.0-rc5+ #151 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> RIP: 0010:fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 pn could be NULL if fib6_add_1() failed. Will submit a fix for this. >> RSP: 0018:ffff8801c7626a70 EFLAGS: 00010202 >> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff84794465 >> RDX: 0000000000000004 RSI: ffff8801d38935f0 RDI: 0000000000000282 >> RBP: ffff8801c7626da0 R08: 1ffff10038ec4c35 R09: 0000000000000000 >> R10: ffff8801c7626c68 R11: 0000000000000000 R12: 00000000fffffffe >> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009 >> FS: 0000000000000000(0000) GS:ffff8801db200000(0063) >> knlGS:0000000009b70840 >> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 >> CR2: 0000000020be1000 CR3: 00000001d585a006 CR4: 00000000001606f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> Call Trace: >> __ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1006 >> ip6_route_multipath_add+0xd14/0x16c0 net/ipv6/route.c:3833 >> inet6_rtm_newroute+0xdc/0x160 net/ipv6/route.c:3957 >> rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411 >> netlink_rcv_skb+0x21e/0x460 net/netlink/af_netlink.c:2408 >> rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423 >> netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline] >> netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1301 >> netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864 >> sock_sendmsg_nosec net/socket.c:636 [inline] >> sock_sendmsg+0xca/0x110 net/socket.c:646 >> sock_write_iter+0x31a/0x5d0 net/socket.c:915 >> call_write_iter include/linux/fs.h:1772 [inline] >> do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653 >> do_iter_write+0x154/0x540 fs/read_write.c:932 >> compat_writev+0x225/0x420 fs/read_write.c:1246 >> do_compat_writev+0x115/0x220 fs/read_write.c:1267 >> C_SYSC_writev fs/read_write.c:1278 [inline] >> compat_SyS_writev+0x26/0x30 fs/read_write.c:1274 >> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline] >> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389 >> entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125 >> RIP: 0023:0xf7f1fc79 >> RSP: 002b:00000000ffb61bfc EFLAGS: 00000203 ORIG_RAX: 0000000000000092 >> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204aaff0 >> RDX: 0000000000000001 RSI: 0000000000000167 RDI: 0000000000000010 >> RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 >> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 >> Code: f1 a9 f6 fc e8 2c f2 e2 fc 85 c0 0f 85 d5 03 00 00 49 8d 5e 20 e8 >> db a9 f6 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c >> 02 00 0f 85 5a 0c 00 00 4d 39 ee 4d 8b 7e 20 0f 95 c0 4c >> RIP: fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 RSP: ffff8801c7626a70 >> ---[ end trace 956c65133fcfff88 ]--- >> >> >> --- >> This bug is generated by a dumb bot. It may contain errors. >> See https://goo.gl/tpsmEJ for details. >> Direct all questions to syzkaller@googlegroups.com. >> >> syzbot will keep track of this bug report. >> If you forgot to add the Reported-by tag, once the fix for this bug is >> merged >> into any tree, please reply to this email with: >> #syz fix: exact-commit-title >> If you want to test a patch for this bug, please reply with: >> #syz test: git://repo/address.git branch >> and provide the patch inline or as an attachment. >> To mark this as a duplicate of another syzbot report, please reply with: >> #syz dup: exact-subject-of-another-report >> If it's a one-off invalid bug report, please reply with: >> #syz invalid >> Note: if the crash happens again, it will cause creation of a new bug >> report. >> Note: all commands must start from beginning of the line in the email body. >