* [syzbot] [net?] general protection fault in generic_hwtstamp_ioctl_lower (2)
@ 2025-02-04 15:22 syzbot
2025-02-07 1:56 ` Jakub Kicinski
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2025-02-04 15:22 UTC (permalink / raw)
To: davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13324b24580000
kernel config: https://syzkaller.appspot.com/x/.config?x=98d83cc1742b7377
dashboard link: https://syzkaller.appspot.com/bug?extid=86a8ab09a0f655f1ff19
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17324b24580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161595f8580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3d07b0558b0e/disk-69e858e0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e5e2250eb3b1/vmlinux-69e858e0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3e676d17effc/bzImage-69e858e0.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+86a8ab09a0f655f1ff19@syzkaller.appspotmail.com
netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 5827 Comm: syz-executor976 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:generic_hwtstamp_ioctl_lower+0x125/0x420 net/core/dev_ioctl.c:456
Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 ba 00 00 00 00 00 fc ff df 4d 8b 75 10 49 8d 7e 10 48 89 f8 48 c1 e8 03 <0f> b6 0c 10 49 8d 46 27 48 89 c6 83 e0 07 48 c1 ee 03 0f b6 14 16
RSP: 0018:ffffc90003e4f250 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff88807c788000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff893547b8 RDI: 0000000000000010
RBP: ffffc90003e4f338 R08: 0000000000000007 R09: 0000000000000003
R10: ffffc90003e4f2ab R11: 0000000000000001 R12: 1ffff920007c9e4e
R13: ffffc90003e4f410 R14: 0000000000000000 R15: 1ffff920007c9e9b
FS: 0000555562e35380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000180 CR3: 0000000078b1a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
generic_hwtstamp_get_lower net/core/dev_ioctl.c:480 [inline]
generic_hwtstamp_get_lower+0xe8/0x130 net/core/dev_ioctl.c:468
dev_get_hwtstamp_phylib+0x181/0x610 net/core/dev_ioctl.c:291
tsconfig_prepare_data+0x15f/0x650 net/ethtool/tsconfig.c:51
ethnl_default_doit+0x31a/0xbd0 net/ethtool/netlink.c:493
genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2543
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892
sock_sendmsg_nosec net/socket.c:713 [inline]
__sock_sendmsg net/socket.c:728 [inline]
____sys_sendmsg+0x9ae/0xb40 net/socket.c:2568
___sys_sendmsg+0x135/0x1e0 net/socket.c:2622
__sys_sendmsg+0x16e/0x220 net/socket.c:2654
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f098155c919
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffca30ea5f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f09815aa4ad RCX: 00007f098155c919
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 00007f09815aa47d R08: 0000000000000000 R09: 0000555500000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f09815aa3e5
R13: 0000000000000001 R14: 00007ffca30ea640 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_hwtstamp_ioctl_lower+0x125/0x420 net/core/dev_ioctl.c:456
Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 ba 00 00 00 00 00 fc ff df 4d 8b 75 10 49 8d 7e 10 48 89 f8 48 c1 e8 03 <0f> b6 0c 10 49 8d 46 27 48 89 c6 83 e0 07 48 c1 ee 03 0f b6 14 16
RSP: 0018:ffffc90003e4f250 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff88807c788000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff893547b8 RDI: 0000000000000010
RBP: ffffc90003e4f338 R08: 0000000000000007 R09: 0000000000000003
R10: ffffc90003e4f2ab R11: 0000000000000001 R12: 1ffff920007c9e4e
R13: ffffc90003e4f410 R14: 0000000000000000 R15: 1ffff920007c9e9b
FS: 0000555562e35380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000180 CR3: 0000000078b1a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
0: 48 c1 ea 03 shr $0x3,%rdx
4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
8: 0f 85 b7 02 00 00 jne 0x2c5
e: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
15: fc ff df
18: 4d 8b 75 10 mov 0x10(%r13),%r14
1c: 49 8d 7e 10 lea 0x10(%r14),%rdi
20: 48 89 f8 mov %rdi,%rax
23: 48 c1 e8 03 shr $0x3,%rax
* 27: 0f b6 0c 10 movzbl (%rax,%rdx,1),%ecx <-- trapping instruction
2b: 49 8d 46 27 lea 0x27(%r14),%rax
2f: 48 89 c6 mov %rax,%rsi
32: 83 e0 07 and $0x7,%eax
35: 48 c1 ee 03 shr $0x3,%rsi
39: 0f b6 14 16 movzbl (%rsi,%rdx,1),%edx
---
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@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [net?] general protection fault in generic_hwtstamp_ioctl_lower (2)
2025-02-04 15:22 [syzbot] [net?] general protection fault in generic_hwtstamp_ioctl_lower (2) syzbot
@ 2025-02-07 1:56 ` Jakub Kicinski
2025-02-07 10:19 ` Kory Maincent
0 siblings, 1 reply; 3+ messages in thread
From: Jakub Kicinski @ 2025-02-07 1:56 UTC (permalink / raw)
To: Kory Maincent
Cc: syzbot, davem, edumazet, horms, linux-kernel, netdev, pabeni,
syzkaller-bugs
On Tue, 04 Feb 2025 07:22:16 -0800 syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13324b24580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=98d83cc1742b7377
> dashboard link: https://syzkaller.appspot.com/bug?extid=86a8ab09a0f655f1ff19
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17324b24580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161595f8580000
Hi Kory!
Looks like syzbot wasn't able to bisect and didn't CC you.
Please take a look, looks like struct kernel_hwtstamp_config
gets into the ioctl paths.
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/3d07b0558b0e/disk-69e858e0.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/e5e2250eb3b1/vmlinux-69e858e0.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/3e676d17effc/bzImage-69e858e0.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+86a8ab09a0f655f1ff19@syzkaller.appspotmail.com
>
> netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
> netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
> netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
> CPU: 0 UID: 0 PID: 5827 Comm: syz-executor976 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
> RIP: 0010:generic_hwtstamp_ioctl_lower+0x125/0x420 net/core/dev_ioctl.c:456
> Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 ba 00 00 00 00 00 fc ff df 4d 8b 75 10 49 8d 7e 10 48 89 f8 48 c1 e8 03 <0f> b6 0c 10 49 8d 46 27 48 89 c6 83 e0 07 48 c1 ee 03 0f b6 14 16
> RSP: 0018:ffffc90003e4f250 EFLAGS: 00010202
> RAX: 0000000000000002 RBX: ffff88807c788000 RCX: 0000000000000000
> RDX: dffffc0000000000 RSI: ffffffff893547b8 RDI: 0000000000000010
> RBP: ffffc90003e4f338 R08: 0000000000000007 R09: 0000000000000003
> R10: ffffc90003e4f2ab R11: 0000000000000001 R12: 1ffff920007c9e4e
> R13: ffffc90003e4f410 R14: 0000000000000000 R15: 1ffff920007c9e9b
> FS: 0000555562e35380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000180 CR3: 0000000078b1a000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> generic_hwtstamp_get_lower net/core/dev_ioctl.c:480 [inline]
> generic_hwtstamp_get_lower+0xe8/0x130 net/core/dev_ioctl.c:468
> dev_get_hwtstamp_phylib+0x181/0x610 net/core/dev_ioctl.c:291
> tsconfig_prepare_data+0x15f/0x650 net/ethtool/tsconfig.c:51
> ethnl_default_doit+0x31a/0xbd0 net/ethtool/netlink.c:493
> genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115
> genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
> genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210
> netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2543
> genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
> netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
> netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348
> netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892
> sock_sendmsg_nosec net/socket.c:713 [inline]
> __sock_sendmsg net/socket.c:728 [inline]
> ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2568
> ___sys_sendmsg+0x135/0x1e0 net/socket.c:2622
> __sys_sendmsg+0x16e/0x220 net/socket.c:2654
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f098155c919
> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffca30ea5f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00007f09815aa4ad RCX: 00007f098155c919
> RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003
> RBP: 00007f09815aa47d R08: 0000000000000000 R09: 0000555500000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f09815aa3e5
> R13: 0000000000000001 R14: 00007ffca30ea640 R15: 0000000000000003
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:generic_hwtstamp_ioctl_lower+0x125/0x420 net/core/dev_ioctl.c:456
> Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 b7 02 00 00 48 ba 00 00 00 00 00 fc ff df 4d 8b 75 10 49 8d 7e 10 48 89 f8 48 c1 e8 03 <0f> b6 0c 10 49 8d 46 27 48 89 c6 83 e0 07 48 c1 ee 03 0f b6 14 16
> RSP: 0018:ffffc90003e4f250 EFLAGS: 00010202
> RAX: 0000000000000002 RBX: ffff88807c788000 RCX: 0000000000000000
> RDX: dffffc0000000000 RSI: ffffffff893547b8 RDI: 0000000000000010
> RBP: ffffc90003e4f338 R08: 0000000000000007 R09: 0000000000000003
> R10: ffffc90003e4f2ab R11: 0000000000000001 R12: 1ffff920007c9e4e
> R13: ffffc90003e4f410 R14: 0000000000000000 R15: 1ffff920007c9e9b
> FS: 0000555562e35380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000180 CR3: 0000000078b1a000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess), 3 bytes skipped:
> 0: 48 c1 ea 03 shr $0x3,%rdx
> 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
> 8: 0f 85 b7 02 00 00 jne 0x2c5
> e: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
> 15: fc ff df
> 18: 4d 8b 75 10 mov 0x10(%r13),%r14
> 1c: 49 8d 7e 10 lea 0x10(%r14),%rdi
> 20: 48 89 f8 mov %rdi,%rax
> 23: 48 c1 e8 03 shr $0x3,%rax
> * 27: 0f b6 0c 10 movzbl (%rax,%rdx,1),%ecx <-- trapping instruction
> 2b: 49 8d 46 27 lea 0x27(%r14),%rax
> 2f: 48 89 c6 mov %rax,%rsi
> 32: 83 e0 07 and $0x7,%eax
> 35: 48 c1 ee 03 shr $0x3,%rsi
> 39: 0f b6 14 16 movzbl (%rsi,%rdx,1),%edx
>
>
> ---
> 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@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [net?] general protection fault in generic_hwtstamp_ioctl_lower (2)
2025-02-07 1:56 ` Jakub Kicinski
@ 2025-02-07 10:19 ` Kory Maincent
0 siblings, 0 replies; 3+ messages in thread
From: Kory Maincent @ 2025-02-07 10:19 UTC (permalink / raw)
To: Jakub Kicinski
Cc: syzbot, davem, edumazet, horms, linux-kernel, netdev, pabeni,
syzkaller-bugs
On Thu, 6 Feb 2025 17:56:18 -0800
Jakub Kicinski <kuba@kernel.org> wrote:
> On Tue, 04 Feb 2025 07:22:16 -0800 syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=13324b24580000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=98d83cc1742b7377
> > dashboard link: https://syzkaller.appspot.com/bug?extid=86a8ab09a0f655f1ff19
> > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for
> > Debian) 2.40 syz repro:
> > https://syzkaller.appspot.com/x/repro.syz?x=17324b24580000 C reproducer:
> > https://syzkaller.appspot.com/x/repro.c?x=161595f8580000
>
> Hi Kory!
>
> Looks like syzbot wasn't able to bisect and didn't CC you.
> Please take a look, looks like struct kernel_hwtstamp_config
> gets into the ioctl paths.
Hello Jakub,
Thanks for transferring it to me. I will look at it.
Regards,
--
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2025-02-07 10:19 UTC | newest]
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2025-02-04 15:22 [syzbot] [net?] general protection fault in generic_hwtstamp_ioctl_lower (2) syzbot
2025-02-07 1:56 ` Jakub Kicinski
2025-02-07 10:19 ` Kory Maincent
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