From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (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 E497B1A00EE for ; Thu, 4 Jul 2024 07:49:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720079367; cv=none; b=jUQEkSgGwg/haLOf8/7KthPQHx/co78A1g1b3c6a17VUXhhDeRehNEWIDCh67JecXrKKHbrX9h4PIWWVJxoIp6txD/s0mABIRvYvKaPBeAN9Noxd9VIWw9P2W+DfoOoQ5YhE6gizQb5xcVvucgoT3nGY4o4u62WfSMBBSk/WDXo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720079367; c=relaxed/simple; bh=fRJ9mdCf/yjl1pTE76e0G5Tx9++NOezYN6PapUoXc+I=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=mj1h4vmFSKk9TKV9K4oaOLsY9f7xTyg+TN8ZJ3Gp71S39X10JPUkNWZUXKkZIktjiIZsFyk4Oi013FJzeVKLp6U1Z2awecfJh0EbYS7QhIYz2UKIBrgApFfY7vrYpzc10TqkTTw+ddNwGSk38e6cNkwmayROkqukLYMjdhwKsLM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-io1-f69.google.com with SMTP id ca18e2360f4ac-7f3d2fd6ad6so53089839f.1 for ; Thu, 04 Jul 2024 00:49:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720079365; x=1720684165; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=XNcvIG+a7ieD4+d4PFj/wmMwJNYqJKim7sgKIcFXUdk=; b=WnPTjv8ykThk4bPfYWzcMJpp9hIeg7Fm3xaUFxfY6UF93nOOncHmv6oVoA/Ed2dpI2 ZuKPySj3y6iOK/GigLpsfPx80yUnbOT2Wx3mRuqnyPXeLVEOr3pJ/AGU9Baq12ooHmkF pmsiIDFYSX1AgDlM/YI1R3ekgdTR/iVcyUGWmcBfoKaptWSu7t5XItsBQaz8eY35+OD2 bHp/MLSAHfIxeQhZ1w/ESKGE/hF7kzGmAyyu00NPHlqX1TRdlUZ3tPB9Toa2llqV9vjW IDN597dz7YaQpXHQc8mvYwcOE68iHW1jPlsOH6HrmftLYOSGa6kMXy+JMYU7bbQ/ZRN5 VI8g== X-Forwarded-Encrypted: i=1; AJvYcCUq9T13XmHeEXqEIfMlLIzWTWs9kuW7GQvoxqYLITDVe64znpEHg74S3KFd3OnvHoqRFDfhpIYdGWKiMC9TtbUYfnzAuy6CKbpHD4UdusKoJN/lYxja X-Gm-Message-State: AOJu0YwMojpyFpMDONjXLVLvTDRy/R1U3BRWaePWvhII4Tiw/8P2NHQr K5nJ7vol7YsOjpVS6f45bNDCIlxeci9TADkTKiyVyKxVtEuTlyxPr5flZQhRx/vAGvNU32FcM7D BtGhWrNPsTWwhreARBIm57uQ6SxZFMrwt5FkAxFvp5xa6R8YwEXLylDA= X-Google-Smtp-Source: AGHT+IEDVkVNlNtEo+/+qLpMXqGS0qbZqRtg0fySo+o+isLfqFM0A+dR184HBtSolMGT/bhAFiCsXmK5rZqueVnxBxNJd9nz9vb1 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:13cf:b0:4b9:3703:4adf with SMTP id 8926c6da1cb9f-4bf610d223emr68590173.3.1720079365092; Thu, 04 Jul 2024 00:49:25 -0700 (PDT) Date: Thu, 04 Jul 2024 00:49:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008acfcf061c672fba@google.com> Subject: [syzbot] [lsm?] KASAN: slab-use-after-free Read in smack_socket_sock_rcv_skb From: syzbot To: casey@schaufler-ca.com, jmorris@namei.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, paul@paul-moore.com, serge@hallyn.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8282d5af7be8 Merge tag 'nfs-for-6.10-3' of git://git.linux.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1235ae99980000 kernel config: https://syzkaller.appspot.com/x/.config?x=67463c0717b8d4ca dashboard link: https://syzkaller.appspot.com/bug?extid=4ca2868197c9747dca53 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/0501bcb3ee43/disk-8282d5af.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a0f124c04344/vmlinux-8282d5af.xz kernel image: https://storage.googleapis.com/syzbot-assets/1d5690d55f9c/bzImage-8282d5af.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4ca2868197c9747dca53@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in smack_socket_sock_rcv_skb+0xec/0x13a0 security/smack/smack_lsm.c:4142 Read of size 8 at addr ffff888023db9498 by task kworker/u9:7/5088 CPU: 1 PID: 5088 Comm: kworker/u9:7 Not tainted 6.10.0-rc5-syzkaller-00282-g8282d5af7be8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: hci0 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 smack_socket_sock_rcv_skb+0xec/0x13a0 security/smack/smack_lsm.c:4142 security_sock_rcv_skb+0x6d/0xa0 security/security.c:4603 sk_filter_trim_cap+0x184/0xa80 net/core/filter.c:150 sk_filter include/linux/filter.h:945 [inline] l2cap_sock_recv_cb+0x12d/0x4f0 net/bluetooth/l2cap_sock.c:1502 l2cap_conless_channel net/bluetooth/l2cap_core.c:6774 [inline] l2cap_recv_frame+0x8d47/0x107d0 net/bluetooth/l2cap_core.c:6827 hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline] hci_rx_work+0x50f/0xca0 net/bluetooth/hci_core.c:4079 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 24593: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4123 [inline] __kmalloc_noprof+0x1f9/0x400 mm/slub.c:4136 kmalloc_noprof include/linux/slab.h:664 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2080 sk_alloc+0x38/0x370 net/core/sock.c:2133 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1869 [inline] l2cap_sock_create+0x13f/0x2d0 net/bluetooth/l2cap_sock.c:1909 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x490/0x920 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1706 __do_sys_socket net/socket.c:1720 [inline] __se_sys_socket net/socket.c:1718 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1718 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 Freed by task 24593: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kfree+0x149/0x360 mm/slub.c:4559 sk_prot_free net/core/sock.c:2116 [inline] __sk_destruct+0x476/0x5f0 net/core/sock.c:2208 l2cap_sock_release+0x15b/0x1d0 net/bluetooth/l2cap_sock.c:1417 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x406/0x8b0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888023db9000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1176 bytes inside of freed 2048-byte region [ffff888023db9000, ffff888023db9800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23db8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015042000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015042000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea00008f6e01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7400, tgid 7400 (kworker/u8:13), ts 897858391086, free_ts 897824765702 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2265 allocate_slab+0x5a/0x2f0 mm/slub.c:2428 new_slab mm/slub.c:2481 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3667 __slab_alloc+0x58/0xa0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3990 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4143 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:597 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:666 alloc_skb include/linux/skbuff.h:1308 [inline] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6504 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2794 sock_alloc_send_skb include/net/sock.h:1773 [inline] mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746 add_grhead net/ipv6/mcast.c:1849 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987 mld_send_initial_cr+0x228/0x4b0 net/ipv6/mcast.c:2233 ipv6_mc_dad_complete+0x88/0x490 net/ipv6/mcast.c:2244 page last free pid 5064 tgid 5064 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2588 skb_free_frag include/linux/skbuff.h:3354 [inline] skb_free_head net/core/skbuff.c:1079 [inline] skb_release_data+0x6b2/0x880 net/core/skbuff.c:1108 skb_release_all net/core/skbuff.c:1173 [inline] __napi_kfree_skb net/core/skbuff.c:1451 [inline] kfree_skb_napi_cache net/core/skbuff.c:7007 [inline] skb_attempt_defer_free+0x42f/0x5c0 net/core/skbuff.c:7029 tcp_eat_recv_skb net/ipv4/tcp.c:1520 [inline] tcp_recvmsg_locked+0x1500/0x2640 net/ipv4/tcp.c:2544 tcp_recvmsg+0x25d/0x920 net/ipv4/tcp.c:2590 inet_recvmsg+0x150/0x2d0 net/ipv4/af_inet.c:885 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg+0x1ae/0x280 net/socket.c:1068 sock_read_iter+0x2ca/0x3e0 net/socket.c:1138 new_sync_read fs/read_write.c:395 [inline] vfs_read+0x9c4/0xbd0 fs/read_write.c:476 ksys_read+0x1a0/0x2c0 fs/read_write.c:619 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 Memory state around the buggy address: ffff888023db9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023db9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888023db9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888023db9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023db9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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 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