From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C4162BB17 for ; Thu, 26 Jun 2025 19:25:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750965941; cv=none; b=GvGAyMCBzp9O8RbVZgkxSSh8CxqXPgfpl9bYPyacX8fIyhjR/8N9t/SNxrwSYp17s16UwC9Ob/wZkhxuENCFaTmIyXC1IFoRE5HmQBNkQoIPiKY8KvSwfKazKy44vmHmEspDRaPmsIjhjZRN5/ub73YyAKYpA+eJDVpB9nETv20= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750965941; c=relaxed/simple; bh=Umg9+xD0kUpefrULO9831amcm/kvWphY/2gpXmp9WX8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:318f:b0:3dc:7d57:30a8 with SMTP id e9e14a558f8ab-3df4aba4e14mr8321715ab.10.1750965937642; Thu, 26 Jun 2025 12:25:37 -0700 (PDT) Date: Thu, 26 Jun 2025 12:25:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <685d9eb1.050a0220.2303ee.02a7.GAE@google.com> Subject: [syzbot] [net?] KASAN: slab-out-of-bounds Read in pause_parse_request From: syzbot To: andrew@lunn.ch, danieller@nvidia.com, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kory.maincent@bootlin.com, kuba@kernel.org, linux-kernel@vger.kernel.org, maxime.chevallier@bootlin.com, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a9b24b3583ae net: phy: realtek: add error handling to rtl8.. git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=15d50f0c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fab0bcec5be1995b dashboard link: https://syzkaller.appspot.com/bug?extid=430f9f76633641a62217 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d1b182580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120bff0c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9205e4571dc2/disk-a9b24b35.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9a698a98f3a1/vmlinux-a9b24b35.xz kernel image: https://storage.googleapis.com/syzbot-assets/5964c8e14f44/bzImage-a9b24b35.xz The issue was bisected to: commit 963781bdfe2007e062e05b6b8a263ae9340bd523 Author: Jakub Kicinski Date: Mon Jun 23 23:17:15 2025 +0000 net: ethtool: call .parse_request for SET handlers bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=101f208c580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=121f208c580000 console output: https://syzkaller.appspot.com/x/log.txt?x=141f208c580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+430f9f76633641a62217@syzkaller.appspotmail.com Fixes: 963781bdfe20 ("net: ethtool: call .parse_request for SET handlers") ================================================================== BUG: KASAN: slab-out-of-bounds in pause_parse_request+0x40/0x160 net/ethtool/pause.c:37 Read of size 8 at addr ffff888034301530 by task syz-executor369/5848 CPU: 1 UID: 0 PID: 5848 Comm: syz-executor369 Not tainted 6.16.0-rc2-syzkaller-00867-ga9b24b3583ae #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 pause_parse_request+0x40/0x160 net/ethtool/pause.c:37 ethnl_default_parse net/ethtool/netlink.c:456 [inline] ethnl_default_set_doit+0x2c1/0xa40 net/ethtool/netlink.c:881 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x205/0x470 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+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f99cc8969d9 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:00007ffdf8e93908 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f99cc8e44ad RCX: 00007f99cc8969d9 RDX: 0000000000000040 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 00007f99cc8e447d R08: 0000000000000000 R09: 0000555500000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f99cc8e43e5 R13: 0000000000000001 R14: 00007ffdf8e93950 R15: 0000000000000003 Allocated by task 5848: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] kmalloc_array_noprof include/linux/slab.h:948 [inline] genl_family_rcv_msg_attrs_parse+0xa3/0x2a0 net/netlink/genetlink.c:940 genl_family_rcv_msg_doit+0xb8/0x300 net/netlink/genetlink.c:1093 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x205/0x470 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+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888034301500 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes to the right of allocated 40-byte region [ffff888034301500, ffff888034301528) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34301 ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801a4418c0 ffffea00009e8e40 dead000000000003 raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1153, tgid 1153 (kworker/u8:6), ts 27371323863, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_noprof+0x305/0x4f0 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] lsm_blob_alloc security/security.c:684 [inline] lsm_task_alloc security/security.c:771 [inline] security_task_alloc+0x4d/0x360 security/security.c:3160 copy_process+0x1530/0x3c00 kernel/fork.c:2151 kernel_clone+0x21e/0x870 kernel/fork.c:2599 user_mode_thread+0xdd/0x140 kernel/fork.c:2677 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 page_owner free stack trace missing Memory state around the buggy address: ffff888034301400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888034301480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888034301500: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888034301580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888034301600: 00 00 00 00 00 00 05 fc fc fc fc fc fc fc fc fc ================================================================== --- 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