From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 942111FC7FE for ; Mon, 27 Jan 2025 07:59:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737964763; cv=none; b=Xdv+FF0V9ujGu0RvHJjGj9VVS1LHxxrWuHtiCU6rnQkJzwmFxL2JSA4CnYaee8RThemPGL45uY+4PltZu/wnr7onWrCBkp4uuiuni9kNLdxUa+II7tw2O6UbPLnFlHbkrkBot4fAu+PuhmwEIU1M7FF9DPUd1FSCtx6QZEhXfMk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737964763; c=relaxed/simple; bh=SVRKuDGV/iQ4a5EQ8vy+pBD1L4Zl7Kgf0ZwR1z3ezYo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=HHRjpT+j7rmThsz9bRuVPEoCVbgAOKlxFVyicoTNNtPeWYBuuYWVIoD/8pR2f3FP3G4DLSL1xVk/qQ9o+lcSBEoqLyBt8GTDqkfN1LLG96csGiVg1WxvqaIW/UaThlAXpgxZb+bN/BNhPmRSQ/VPBVFirXU+5MQZ1GNwoB2I1Nk= 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=209.85.166.208 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-il1-f208.google.com with SMTP id e9e14a558f8ab-3cfba1ca53bso30296185ab.3 for ; Sun, 26 Jan 2025 23:59:21 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737964760; x=1738569560; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=057ToeDcX5gl484GndQKpevaLOqwDphYFy7+qxMQhuc=; b=OWsAjkc0CW73yrUBwrG6EwlNBrOO1nlFysjnK6wnbxrlgSBU7kaW+Gybef9d8HoYft rOllz21S50uHb8Mp1oAJqTK0/yyO4LoFXGqmXjauPee8Vpjsft95Jiso7dPDOgpJyFwn IipURYaY2ercgN03gA4dn9LmvQERTOnZ1bG8NmybZ4z1da7lNiZPbTIOcaxPK7u4Msv9 0rcBlGNACEMc0uL/iowZ3BhWija90vu+sFU1ZXJ1wS4KCJ7Kt2hvuwn8I51M/1hmurbu Z/upI6+xowpO8XQQ1kyO5aGkP9zOZX+57Qi1Cy2xPFp1wx5Y7GuD2IOtf2grCCF/CGkP WCAg== X-Forwarded-Encrypted: i=1; AJvYcCVhWssnpIFGhq1Pb63k6sUp7BWToCZrmE8IFisLgWspwzxHZiW6ihPKs1HALYXajhW1EOjgdbq3dvTHXHI=@vger.kernel.org X-Gm-Message-State: AOJu0YzvK/tpr3TLj2U+rhe0l6YV2n3woGjoF7efix3JPo5dKfpq2LDQ rZqTgTHydL6/+k3I/5oUmmw+mja6k3KZzC3bzKDTqR786wFVYE2TGQSbDNVMGrPpeX90l2KXhRK LcQWN4pD2Pj8b0I4VaZXsgQzseRK3YX8GpLaNd3G9AQRH5j6tt6SQyac= X-Google-Smtp-Source: AGHT+IH/ude7oaVQq956JjCyM/PgGFs4yd3usmqZ97Jiz97S/1ZBomTB9A5/FXAAPAmsPRXYhQBvttFTJsm8+IX13d3sRlBLTQFo Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2688:b0:3cf:e76b:3937 with SMTP id e9e14a558f8ab-3cfe76b3ab6mr18151345ab.0.1737964760636; Sun, 26 Jan 2025 23:59:20 -0800 (PST) Date: Sun, 26 Jan 2025 23:59:20 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67973cd8.050a0220.2eae65.0044.GAE@google.com> Subject: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in sock_def_readable From: syzbot To: johan.hedberg@gmail.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 95ec54a420b8 Merge tag 'powerpc-6.14-1' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16ace824580000 kernel config: https://syzkaller.appspot.com/x/.config?x=36c0fee2efbf1634 dashboard link: https://syzkaller.appspot.com/bug?extid=0cabe82a7ed71379b27d compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-95ec54a4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3f55c60f56c5/vmlinux-95ec54a4.xz kernel image: https://storage.googleapis.com/syzbot-assets/afb77bff66ad/bzImage-95ec54a4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0cabe82a7ed71379b27d@syzkaller.appspotmail.com Bluetooth: hci2: Opcode 0x0406 failed: -4 ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: slab-use-after-free in sock_flag include/net/sock.h:992 [inline] BUG: KASAN: slab-use-after-free in sk_wake_async_rcu include/net/sock.h:2470 [inline] BUG: KASAN: slab-use-after-free in sock_def_readable+0x175/0x610 net/core/sock.c:3458 Read of size 8 at addr ffff8880750a2060 by task syz.8.2237/20732 CPU: 0 UID: 0 PID: 20732 Comm: syz.8.2237 Not tainted 6.13.0-syzkaller-00918-g95ec54a420b8 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] sock_flag include/net/sock.h:992 [inline] sk_wake_async_rcu include/net/sock.h:2470 [inline] sock_def_readable+0x175/0x610 net/core/sock.c:3458 l2cap_sock_teardown_cb+0x1d1/0x3c0 net/bluetooth/l2cap_sock.c:1602 l2cap_chan_del+0xba/0x8f0 net/bluetooth/l2cap_core.c:658 l2cap_conn_del+0x37c/0x730 net/bluetooth/l2cap_core.c:1785 l2cap_connect_cfm+0x7aa/0xf10 net/bluetooth/l2cap_core.c:7235 hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline] hci_conn_failed+0x225/0x3e0 net/bluetooth/hci_conn.c:1266 hci_abort_conn_sync+0x968/0x1030 net/bluetooth/hci_sync.c:5604 hci_disconnect_all_sync.constprop.0+0x104/0x3c0 net/bluetooth/hci_sync.c:5627 hci_suspend_sync+0x772/0xab0 net/bluetooth/hci_sync.c:6104 hci_suspend_dev+0x27d/0x5e0 net/bluetooth/hci_core.c:2831 hci_suspend_notifier+0x28d/0x2f0 net/bluetooth/hci_core.c:2411 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:345 [inline] blocking_notifier_call_chain_robust+0xc9/0x170 kernel/notifier.c:333 pm_notifier_call_chain_robust+0x27/0x60 kernel/power/main.c:102 snapshot_open+0x189/0x2b0 kernel/power/user.c:77 misc_open+0x35a/0x420 drivers/char/misc.c:165 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0xf59/0x1ea0 fs/open.c:938 vfs_open+0x82/0x3f0 fs/open.c:1068 do_open fs/namei.c:3828 [inline] path_openat+0x1e81/0x2d70 fs/namei.c:3987 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1395 do_sys_open fs/open.c:1410 [inline] __do_compat_sys_openat fs/open.c:1472 [inline] __se_compat_sys_openat fs/open.c:1470 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1470 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf706e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f506055c EFLAGS: 00000296 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000200004c0 RDX: 0000000000000800 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 20737: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_noprof+0x21a/0x4f0 mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [inline] sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2168 sk_alloc+0x36/0xb90 net/core/sock.c:2221 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc.constprop.0+0x33/0x1c0 net/bluetooth/l2cap_sock.c:1879 l2cap_sock_create+0x123/0x1f0 net/bluetooth/l2cap_sock.c:1920 bt_sock_create+0x182/0x350 net/bluetooth/af_bluetooth.c:132 __sock_create+0x335/0x8d0 net/socket.c:1558 sock_create net/socket.c:1616 [inline] __sys_socket_create net/socket.c:1653 [inline] __sys_socket+0x14f/0x260 net/socket.c:1700 __do_sys_socket net/socket.c:1714 [inline] __se_sys_socket net/socket.c:1712 [inline] __ia32_sys_socket+0x72/0xb0 net/socket.c:1712 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 20737: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 sk_prot_free net/core/sock.c:2204 [inline] __sk_destruct+0x5eb/0x720 net/core/sock.c:2296 sk_destruct+0xc2/0xf0 net/core/sock.c:2311 __sk_free+0xf4/0x3e0 net/core/sock.c:2322 sk_free+0x6a/0x90 net/core/sock.c:2333 sock_put include/net/sock.h:1910 [inline] l2cap_sock_kill net/bluetooth/l2cap_sock.c:1252 [inline] l2cap_sock_kill+0x171/0x2d0 net/bluetooth/l2cap_sock.c:1237 l2cap_sock_release+0x189/0x210 net/bluetooth/l2cap_sock.c:1423 __sock_release+0xb0/0x270 net/socket.c:640 sock_close+0x1c/0x30 net/socket.c:1408 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 get_signal+0x1d3/0x2610 kernel/signal.c:2809 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff8880750a2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 96 bytes inside of freed 2048-byte region [ffff8880750a2000, ffff8880750a2800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880750a6000 pfn:0x750a0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801b042f00 ffffea00017b9400 dead000000000002 raw: ffff8880750a6000 0000000000080007 00000001f5000000 0000000000000000 head: 04fff00000000040 ffff88801b042f00 ffffea00017b9400 dead000000000002 head: ffff8880750a6000 0000000000080007 00000001f5000000 0000000000000000 head: 04fff00000000003 ffffea0001d42801 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 11242, tgid 11242 (syz-executor), ts 209858358142, free_ts 209856543599 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x221/0x2470 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x2c8/0x620 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xcda/0x1660 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_track_caller_noprof+0x2ee/0x520 mm/slub.c:4317 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1323 [inline] nlmsg_new include/net/netlink.h:1018 [inline] inet6_ifinfo_notify+0x77/0x150 net/ipv6/addrconf.c:6178 addrconf_notify+0x81a/0x19c0 net/ipv6/addrconf.c:3784 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2026 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:9007 dev_change_flags+0x10c/0x160 net/core/dev.c:9045 page last free pid 11242 tgid 11242 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2659 __put_partials+0x14c/0x170 mm/slub.c:3157 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_noprof+0x1d0/0x520 mm/slub.c:4304 kmalloc_array_node_noprof include/linux/slab.h:1018 [inline] alloc_slab_obj_exts+0x41/0xa0 mm/slub.c:1964 account_slab mm/slub.c:2552 [inline] allocate_slab mm/slub.c:2607 [inline] new_slab+0x314/0x410 mm/slub.c:2642 ___slab_alloc+0xcda/0x1660 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] kmem_cache_alloc_noprof+0xeb/0x3b0 mm/slub.c:4175 sk_prot_alloc+0x60/0x2a0 net/core/sock.c:2162 sk_alloc+0x36/0xb90 net/core/sock.c:2221 unix_create1+0xa6/0x6c0 net/unix/af_unix.c:1024 unix_create+0x10e/0x1d0 net/unix/af_unix.c:1094 __sock_create+0x335/0x8d0 net/socket.c:1558 Memory state around the buggy address: ffff8880750a1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880750a1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880750a2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880750a2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880750a2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- 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