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Message-ID: <00000000000030c20305f2544773@google.com>
Date: Sun, 15 Jan 2023 13:37:49 -0800
From: syzbot <syzbot+8cf35743af243e5f417e@...kaller.appspotmail.com>
To: andrew@...n.ch, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com,
piergiorgio.beruto@...il.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in ethnl_set_plca_cfg
Hello,
syzbot found the following issue on:
HEAD commit: 60d86034b14e Merge tag 'mlx5-updates-2023-01-10' of git://..
git tree: net-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12582c02480000
kernel config: https://syzkaller.appspot.com/x/.config?x=de2f853811ba4e08
dashboard link: https://syzkaller.appspot.com/bug?extid=8cf35743af243e5f417e
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1773adf2480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=140bc05e480000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b5b394a217aa/disk-60d86034.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f129c2da4b3a/vmlinux-60d86034.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6dbc96a4303d/bzImage-60d86034.xz
The issue was bisected to:
commit 8580e16c28f3f1a1bee87de115157161577334b4
Author: Piergiorgio Beruto <piergiorgio.beruto@...il.com>
Date: Mon Jan 9 16:59:39 2023 +0000
net/ethtool: add netlink interface for the PLCA RS
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10fde136480000
final oops: https://syzkaller.appspot.com/x/report.txt?x=12fde136480000
console output: https://syzkaller.appspot.com/x/log.txt?x=14fde136480000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8cf35743af243e5f417e@...kaller.appspotmail.com
Fixes: 8580e16c28f3 ("net/ethtool: add netlink interface for the PLCA RS")
general protection fault, probably for non-canonical address 0xdffffc0000000173: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000b98-0x0000000000000b9f]
CPU: 1 PID: 5067 Comm: syz-executor355 Not tainted 6.2.0-rc2-syzkaller-00378-g60d86034b14e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:ethnl_set_plca_cfg+0x1c5/0x810 net/ethtool/plca.c:162
Code: 28 7a f9 4c 8b 7c 24 58 e8 d8 17 c6 ff 49 8d 87 98 0b 00 00 48 89 c2 48 89 44 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 7d 05 00 00 49 83 bf 98 0b 00 00 00 0f 84 b8 04
RSP: 0018:ffffc90003cbf470 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc90003cbf5d8 RCX: 0000000000000000
RDX: 0000000000000173 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 1ffff92000797e95 R08: 0000000000000000 R09: ffffffff8e72e917
R10: fffffbfff1ce5d22 R11: 0000000000000000 R12: 00000000ffffffea
R13: ffff88801cc43980 R14: ffffc90003cbf618 R15: 0000000000000000
FS: 00005555563b5300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001ac0 CR3: 000000007d808000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968
genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065
netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2564
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb1764e4ae9
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd5160add8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb1764e4ae9
RDX: 0000000000000000 RSI: 0000000020001ac0 RDI: 0000000000000003
RBP: 00007fb1764a84b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb1764a8540
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ethnl_set_plca_cfg+0x1c5/0x810 net/ethtool/plca.c:162
Code: 28 7a f9 4c 8b 7c 24 58 e8 d8 17 c6 ff 49 8d 87 98 0b 00 00 48 89 c2 48 89 44 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 7d 05 00 00 49 83 bf 98 0b 00 00 00 0f 84 b8 04
RSP: 0018:ffffc90003cbf470 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc90003cbf5d8 RCX: 0000000000000000
RDX: 0000000000000173 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 1ffff92000797e95 R08: 0000000000000000 R09: ffffffff8e72e917
R10: fffffbfff1ce5d22 R11: 0000000000000000 R12: 00000000ffffffea
R13: ffff88801cc43980 R14: ffffc90003cbf618 R15: 0000000000000000
FS: 00005555563b5300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001ac0 CR3: 000000007d808000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 28 7a f9 sub %bh,-0x7(%rdx)
3: 4c 8b 7c 24 58 mov 0x58(%rsp),%r15
8: e8 d8 17 c6 ff callq 0xffc617e5
d: 49 8d 87 98 0b 00 00 lea 0xb98(%r15),%rax
14: 48 89 c2 mov %rax,%rdx
17: 48 89 44 24 08 mov %rax,0x8(%rsp)
1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
23: fc ff df
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 7d 05 00 00 jne 0x5b1
34: 49 83 bf 98 0b 00 00 cmpq $0x0,0xb98(%r15)
3b: 00
3c: 0f .byte 0xf
3d: 84 .byte 0x84
3e: b8 .byte 0xb8
3f: 04 .byte 0x4
---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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