Message-ID: <CACT4Y+Yky9uSugZHD=r=604KMQeUiTxGHqM89w7JMOo2Y-1_gw@mail.gmail.com>
Date:   Mon, 16 Aug 2021 11:49:03 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+fafb46da3f65fdbacd16@...kaller.appspotmail.com>
Cc:     alex.aring@...il.com, davem@...emloft.net, 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, 16 Aug 2021 at 11:44, syzbot
<syzbot+fafb46da3f65fdbacd16@...kaller.appspotmail.com> wrote:
>
> > 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:"

 #syz fix: ieee802154: hwsim: fix GPF in hwsim_new_edge_nl

> >> > 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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