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Message-ID: <67a230a8.050a0220.d7c5a.00ba.GAE@google.com> Date: Tue, 04 Feb 2025 07:22:16 -0800 From: syzbot <syzbot+86a8ab09a0f655f1ff19@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] general protection fault in generic_hwtstamp_ioctl_lower (2) 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@...kaller.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@...glegroups.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
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