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Message-ID: <67caaf5e.050a0220.15b4b9.007a.GAE@google.com> Date: Fri, 07 Mar 2025 00:33:34 -0800 From: syzbot <syzbot+3da2442641f0c6a705a2@...kaller.appspotmail.com> To: andrew@...n.ch, 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 ethnl_default_dumpit Hello, syzbot found the following issue on: HEAD commit: 2525e16a2bae Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=147cca64580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fbc61e4c6e816b7b dashboard link: https://syzkaller.appspot.com/bug?extid=3da2442641f0c6a705a2 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bae047feb57e/disk-2525e16a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9f10529c6bdd/vmlinux-2525e16a.xz kernel image: https://storage.googleapis.com/syzbot-assets/8dcb6d0a6029/bzImage-2525e16a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3da2442641f0c6a705a2@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000197: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000cb8-0x0000000000000cbf] CPU: 0 UID: 0 PID: 6809 Comm: syz.2.378 Not tainted 6.14.0-rc5-syzkaller-01064-g2525e16a2bae #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:netdev_need_ops_lock include/linux/netdevice.h:2792 [inline] RIP: 0010:netdev_lock_ops include/linux/netdevice.h:2803 [inline] RIP: 0010:ethnl_default_dump_one net/ethtool/netlink.c:557 [inline] RIP: 0010:ethnl_default_dumpit+0x447/0xd40 net/ethtool/netlink.c:593 Code: 49 8b 1f 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 ca e6 17 f8 4c 8b 3b 49 8d 9f bd 0c 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 4b 07 00 00 0f b6 1b 31 ff 89 de e8 f0 RSP: 0018:ffffc900036370d8 EFLAGS: 00010203 RAX: 0000000000000197 RBX: 0000000000000cbd RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8c80fdc0 RDI: 0000000000000001 RBP: ffff8880285b3780 R08: ffffffff903d0b77 R09: 1ffffffff207a16e R10: dffffc0000000000 R11: fffffbfff207a16f R12: ffff888062f58600 R13: ffff888058d3b140 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fae91f066c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000001ac0 CR3: 0000000028682000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> genl_dumpit+0x10d/0x1b0 net/netlink/genetlink.c:1027 netlink_dump+0x64d/0xe10 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x5a2/0x790 net/netlink/af_netlink.c:2424 genl_family_rcv_msg_dumpit net/netlink/genetlink.c:1076 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline] genl_rcv_msg+0x894/0xec0 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2534 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:709 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:724 ____sys_sendmsg+0x53a/0x860 net/socket.c:2564 ___sys_sendmsg net/socket.c:2618 [inline] __sys_sendmsg+0x269/0x350 net/socket.c:2650 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fae9118d169 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fae91f06038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fae913a5fa0 RCX: 00007fae9118d169 RDX: 0000000000000800 RSI: 0000400000001ac0 RDI: 0000000000000007 RBP: 00007fae9120e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fae913a5fa0 R15: 00007ffee7419f28 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netdev_need_ops_lock include/linux/netdevice.h:2792 [inline] RIP: 0010:netdev_lock_ops include/linux/netdevice.h:2803 [inline] RIP: 0010:ethnl_default_dump_one net/ethtool/netlink.c:557 [inline] RIP: 0010:ethnl_default_dumpit+0x447/0xd40 net/ethtool/netlink.c:593 Code: 49 8b 1f 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 ca e6 17 f8 4c 8b 3b 49 8d 9f bd 0c 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 4b 07 00 00 0f b6 1b 31 ff 89 de e8 f0 RSP: 0018:ffffc900036370d8 EFLAGS: 00010203 RAX: 0000000000000197 RBX: 0000000000000cbd RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8c80fdc0 RDI: 0000000000000001 RBP: ffff8880285b3780 R08: ffffffff903d0b77 R09: 1ffffffff207a16e R10: dffffc0000000000 R11: fffffbfff207a16f R12: ffff888062f58600 R13: ffff888058d3b140 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fae91f066c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000b64000 CR3: 0000000028682000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 49 8b 1f mov (%r15),%rbx 3: 48 89 d8 mov %rbx,%rax 6: 48 c1 e8 03 shr $0x3,%rax a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) f: 74 08 je 0x19 11: 48 89 df mov %rbx,%rdi 14: e8 ca e6 17 f8 call 0xf817e6e3 19: 4c 8b 3b mov (%rbx),%r15 1c: 49 8d 9f bd 0c 00 00 lea 0xcbd(%r15),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 4b 07 00 00 jne 0x782 37: 0f b6 1b movzbl (%rbx),%ebx 3a: 31 ff xor %edi,%edi 3c: 89 de mov %ebx,%esi 3e: e8 .byte 0xe8 3f: f0 lock --- 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 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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