netdev - Re: [syzbot] general protection fault in hwsim_new_edge

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Date:   Mon, 16 Aug 2021 02:44:54 -0700
From:   syzbot <syzbot+fafb46da3f65fdbacd16@...kaller.appspotmail.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     alex.aring@...il.com, davem@...emloft.net, dvyukov@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-wpan@...r.kernel.org, mudongliangabcd@...il.com,
        netdev@...r.kernel.org, stefan@...enfreihafen.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] general protection fault in hwsim_new_edge_nl

> On Mon, 9 Aug 2021 at 10:22, Dongliang Mu <mudongliangabcd@...il.com> wrote:
>>
>> On Mon, Aug 9, 2021 at 3:54 PM syzbot
>> <syzbot+fafb46da3f65fdbacd16@...kaller.appspotmail.com> wrote:
>> >
>> > Hello,
>> >
>> > syzbot found the following issue on:
>> >
>> > HEAD commit:    c2eecaa193ff pktgen: Remove redundant clone_skb override
>> > git tree:       net-next
>> > console output: https://syzkaller.appspot.com/x/log.txt?x=1226099a300000
>> > kernel config:  https://syzkaller.appspot.com/x/.config?x=aba0c23f8230e048
>> > dashboard link: https://syzkaller.appspot.com/bug?extid=fafb46da3f65fdbacd16
>> > compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
>> >
>> > Unfortunately, I don't have any reproducer for this issue yet.
>> >
>> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> > Reported-by: syzbot+fafb46da3f65fdbacd16@...kaller.appspotmail.com
>> >
>> > general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
>> > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
>>
>> Hi all,
>>
>> I think the crash can be fixed by [PATCH] ieee802154: hwsim: fix GPF
>> in hwsim_new_edge_nl [1]. For now, it is in the wpan tree.
>>
>> [1] https://lkml.org/lkml/2021/7/8/66
>
> Let's tell syzbot about the fix:
>
> #syz fx: ieee802154: hwsim: fix GPF in hwsim_new_edge_nl

unknown command "fx:"

>
>> > CPU: 1 PID: 1403 Comm: syz-executor.2 Not tainted 5.14.0-rc3-syzkaller #0
>> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>> > RIP: 0010:nla_len include/net/netlink.h:1148 [inline]
>> > RIP: 0010:nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
>> > RIP: 0010:hwsim_new_edge_nl+0xf4/0x8c0 drivers/net/ieee802154/mac802154_hwsim.c:425
>> > Code: 00 0f 85 76 07 00 00 4d 85 ed 48 8b 5b 10 0f 84 5e 05 00 00 e8 0d f2 40 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 87
>> > RSP: 0018:ffffc90009a47568 EFLAGS: 00010246
>> > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000dd59000
>> > RDX: 0000000000000000 RSI: ffffffff8534ab43 RDI: ffff88801c2b44d0
>> > RBP: ffffc90009a47678 R08: 0000000000000001 R09: ffffc90009a476a8
>> > R10: fffff52001348ed6 R11: 0000000000000000 R12: ffffc90009a47698
>> > R13: ffff888025945c14 R14: ffff888071f0cdc0 R15: 0000000000000000
>> > FS:  00007f8448923700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
>> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > CR2: 00000000032f4708 CR3: 0000000033eed000 CR4: 00000000001506e0
>> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> > Call Trace:
>> >  genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
>> >  genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
>> >  genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
>> >  netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
>> >  genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
>> >  netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
>> >  netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
>> >  netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
>> >  sock_sendmsg_nosec net/socket.c:704 [inline]
>> >  sock_sendmsg+0xcf/0x120 net/socket.c:724
>> >  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
>> >  ___sys_sendmsg+0xf3/0x170 net/socket.c:2457
>> >  __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
>> >  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>> >  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>> >  entry_SYSCALL_64_after_hwframe+0x44/0xae
>> > RIP: 0033:0x4665e9
>> > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
>> > RSP: 002b:00007f8448923188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
>> > RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
>> > RDX: 0000000000000000 RSI: 0000000020001ac0 RDI: 0000000000000004
>> > RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
>> > R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
>> > R13: 00007ffd8ac8e60f R14: 00007f8448923300 R15: 0000000000022000
>> > Modules linked in:
>> > ---[ end trace d1679fe789931133 ]---
>> > RIP: 0010:nla_len include/net/netlink.h:1148 [inline]
>> > RIP: 0010:nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
>> > RIP: 0010:hwsim_new_edge_nl+0xf4/0x8c0 drivers/net/ieee802154/mac802154_hwsim.c:425
>> > Code: 00 0f 85 76 07 00 00 4d 85 ed 48 8b 5b 10 0f 84 5e 05 00 00 e8 0d f2 40 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 87
>> > RSP: 0018:ffffc90009a47568 EFLAGS: 00010246
>> > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000dd59000
>> > RDX: 0000000000000000 RSI: ffffffff8534ab43 RDI: ffff88801c2b44d0
>> > RBP: ffffc90009a47678 R08: 0000000000000001 R09: ffffc90009a476a8
>> > R10: fffff52001348ed6 R11: 0000000000000000 R12: ffffc90009a47698
>> > R13: ffff888025945c14 R14: ffff888071f0cdc0 R15: 0000000000000000
>> > FS:  00007f8448923700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
>> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > CR2: 000055bb2ea2f160 CR3: 0000000033eed000 CR4: 00000000001506f0
>> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> >
>> >
>> > ---
>> > This report is generated by a bot. It may contain errors.
>> > See https://goo.gl/tpsmEJ for more information about syzbot.
>> > syzbot engineers can be reached at syzkaller@...glegroups.com.
>> >
>> > syzbot will keep track of this issue. See:
>> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>> >
>> > --
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>> > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@...glegroups.com.
>> > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000007faf7505c91bb19d%40google.com.
>>
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