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AJvYcCVUql2NE7PB/TzwGW4Bum6kaYKSMV8maUdKikFZwRfCipcjYS3c5GANrvtI2l3HLp04mRpEbBY=@vger.kernel.org X-Gm-Message-State: AOJu0Yyn67bkuuXK7COeAZVTKfOBwervtWxjcak1qm7n0c2kyrZlUlYC MVv+wHFsoD2gsMRJJsN37OkZ4+gcK+6BZBcniiZtzysimJLPrk3zfVtLhmHK/+8LL69xArXsGFA PzyQKmqSi1Nz2J10ZzTYjQCgUXifYQdHFdoQn2MTdtpSmai9/2+1ie0A= X-Google-Smtp-Source: AGHT+IEJrZg6hqF1ufdYAwrvBroFL4iR7AdZbtkxDq4KIcIyQiMuoBrp2BcWiJqdwZtjuPa6p9iK3vstTt7j07J//Q7pjcmVzDYQ Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2168:b0:3d5:8908:92d0 with SMTP id e9e14a558f8ab-3d7ec1eb8ccmr128970965ab.3.1744596869676; Sun, 13 Apr 2025 19:14:29 -0700 (PDT) Date: Sun, 13 Apr 2025 19:14:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67fc6f85.050a0220.2970f9.039e.GAE@google.com> Subject: [syzbot] [net?] general protection fault in rtnl_create_link From: syzbot To: cratiu@nvidia.com, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, kuniyu@amazon.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, sdf@fomichev.me, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: eaa517b77e63 ethtool: cmis_cdb: Fix incorrect read / write.. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=1541f23f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f2054704dd53fb80 dashboard link: https://syzkaller.appspot.com/bug?extid=de1c7d68a10e3f123bdd compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1429874c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1353f74c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8ff6a34dbd2f/disk-eaa517b7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/80dc0689a89b/vmlinux-eaa517b7.xz kernel image: https://storage.googleapis.com/syzbot-assets/093b749f228d/bzImage-eaa517b7.xz The issue was bisected to: commit 04efcee6ef8d0f01eef495db047e7216d6e6e38f Author: Stanislav Fomichev Date: Fri Apr 4 16:11:22 2025 +0000 net: hold instance lock during NETDEV_CHANGE bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=151db7e4580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=171db7e4580000 console output: https://syzkaller.appspot.com/x/log.txt?x=131db7e4580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+de1c7d68a10e3f123bdd@syzkaller.appspotmail.com Fixes: 04efcee6ef8d ("net: hold instance lock during NETDEV_CHANGE") netlink: 4 bytes leftover after parsing attributes in process `syz-executor402'. netlink: 'syz-executor402': attribute type 15 has an invalid length. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000055: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000002a8-0x00000000000002af] CPU: 0 UID: 0 PID: 5841 Comm: syz-executor402 Not tainted 6.14.0-syzkaller-13348-geaa517b77e63 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline] RIP: 0010:rtnl_create_link+0x6af/0xea0 net/core/rtnetlink.c:3680 Code: 24 20 42 80 3c 28 00 74 08 48 89 df e8 4a 3a 3b f8 4c 89 64 24 28 bd a8 02 00 00 48 89 5c 24 08 48 03 2b 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 22 3a 3b f8 45 31 e4 48 83 7d 00 RSP: 0018:ffffc900040b6e70 EFLAGS: 00010206 RAX: 0000000000000055 RBX: ffff888035860008 RCX: ffff888030a01e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000000002a8 R08: ffffffff89f245f9 R09: 1ffff92000816dfa R10: dffffc0000000000 R11: fffff52000816dfb R12: ffff8880212e0080 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888035860000 FS: 000055556170f380(0000) GS:ffff888124f96000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045ad50 CR3: 000000007c1d2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rtnl_newlink_create+0x2f2/0xcb0 net/core/rtnetlink.c:3826 __rtnl_newlink net/core/rtnetlink.c:3953 [inline] rtnl_newlink+0x18b0/0x1fe0 net/core/rtnetlink.c:4068 rtnetlink_rcv_msg+0x80f/0xd70 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff3d9feac39 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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:00007ffe861803d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff3d9feac39 RDX: 0000000004000000 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000200000000110 R14: 0000200000000088 R15: 0000000000000001 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline] RIP: 0010:rtnl_create_link+0x6af/0xea0 net/core/rtnetlink.c:3680 Code: 24 20 42 80 3c 28 00 74 08 48 89 df e8 4a 3a 3b f8 4c 89 64 24 28 bd a8 02 00 00 48 89 5c 24 08 48 03 2b 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 22 3a 3b f8 45 31 e4 48 83 7d 00 RSP: 0018:ffffc900040b6e70 EFLAGS: 00010206 RAX: 0000000000000055 RBX: ffff888035860008 RCX: ffff888030a01e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000000002a8 R08: ffffffff89f245f9 R09: 1ffff92000816dfa R10: dffffc0000000000 R11: fffff52000816dfb R12: ffff8880212e0080 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888035860000 FS: 000055556170f380(0000) GS:ffff888125096000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000140 CR3: 000000007c1d2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 20 and $0x20,%al 2: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 7: 74 08 je 0x11 9: 48 89 df mov %rbx,%rdi c: e8 4a 3a 3b f8 call 0xf83b3a5b 11: 4c 89 64 24 28 mov %r12,0x28(%rsp) 16: bd a8 02 00 00 mov $0x2a8,%ebp 1b: 48 89 5c 24 08 mov %rbx,0x8(%rsp) 20: 48 03 2b add (%rbx),%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 22 3a 3b f8 call 0xf83b3a5b 39: 45 31 e4 xor %r12d,%r12d 3c: 48 rex.W 3d: 83 .byte 0x83 3e: 7d 00 jge 0x40 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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