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Wed, 14 Oct 2026 00:24:24 +0000 (GMT) Received: from li-43857255-d5e6-4659-90f1-fc5cee4750ad.ibm.com (unknown [9.61.95.51]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Wed, 14 Oct 2026 00:24:24 +0000 (GMT) Message-ID: Subject: Re: [syzbot] [integrity?] [lsm?] possible deadlock in __configfs_open_file (2) From: Mimi Zohar To: syzbot , a.hindborg@kernel.org, leitao@debian.org, linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, syzkaller-bugs@googlegroups.com In-Reply-To: <6aceaf21.8cdf6287.1eb53.0174.GAE@google.com> References: <6aceaf21.8cdf6287.1eb53.0174.GAE@google.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 13 Oct 2026 20:24:24 -0400 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Evolution 3.58.3 (3.58.3-2.fc43) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: qhtC-pk2dxjAPZixsyK1xNdoKqmeMj9_ X-Proofpoint-ORIG-GUID: qhtC-pk2dxjAPZixsyK1xNdoKqmeMj9_ X-Authority-Analysis: v=2.4 cv=aqInmiZV c=1 sm=1 tr=0 ts=6acecbbb cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=edf1wS77AAAA:8 a=VwQbUJbxAAAA:8 a=hSkVLCK3AAAA:8 a=9UXA8gvBw8XVqFqs_TcA:9 a=QEXdDO2ut3YA:10 a=DcSpbTIhAlouE1Uv7lRv:22 a=cQPPKAXgyycSBL8etih5:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE0MDAwMCBTYWx0ZWRfX+jDRAWbQ+XYo Y1qMpbmjYyl17nNuVGTYc3wzUDpd+bSZgkqo3t2/LAmW59g5nKOP+g1Wbos/o6xiF869eqqbzC2 NbgFXKHP4euGNlnXd1s8EOWVL9QZac8= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE0MDAwMCBTYWx0ZWRfXxEm1eecCxU48 B3xuEovCwHXaMHokM4mNv7IOM/O0mKXIKtypQv5ixp2P07jFhvLDhoRISB3MKLD570bqt3YfOtV Aqka8MkimqE7sUqz0yTy1o3ipRX1nW9axoKjsi2JfLjc0JIJ5DYmXt2ktjR8M7gMt1g2Jag2CvI hlInncua7iNi/r//VWUaOsVrT1CcdZH+AvNl3tTsWVTDRlLKSnWu6pa50C+6kWYzAesLtnNl8Oa EETv2gLySBmQRcZD9rnA3CixCEwyFdWF1kT9wu9o+wU4ceOf5UnIjTAfQxTGiJUincdePNlvmeL +hEaX//zocn2eqpphIIgkQ580bArL4gHmWgHpp732GmjggIwCzlnIqedR95rGOATQTZ2eOUGIRj Bcvl25678fLLzq3v3c11LFdD6DZTTtdRG6zhY36cizVzCE82eBI0+q7eQkw0wgf4UCXl5Ff7+jU 3gtRxHRi7wXU7B4gQYA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-13_01,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1011 spamscore=0 malwarescore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610140000 On Tue, 2026-10-13 at 15:22 -0700, syzbot wrote: > syzbot has found a reproducer for the following issue on: >=20 > HEAD commit: 24a19b953e2a Linux 7.3-rc7 > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/li= nux.git > console output: https://syzkaller.appspot.com/x/log.txt?x=3D165f3c3558000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D129d675874dbf= 896 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dc87014f645f2fd2= 4312e > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for D= ebian) 2.44 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D10cf93d158000= 0 >=20 > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+c87014f645f2fd24312e@syzkaller.appspotmail.com >=20 Commits 8e22ce504f8a ("ima: don't measure/appraise files on configfs") and ab84c314417e ("configfs: move CONFIGFS_MAGIC definition to magic.h") addres= sed this or a similar issue for the builtin IMA policies. If you're using a cus= tom IMA policy, it needs a configfs dont_measure and/or dont_appraise rule. Please provide the IMA policy. Mimi > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D > WARNING: possible circular locking dependency detected > syzkaller #0 Not tainted > ------------------------------------------------------ > syz-executor387/5997 is trying to acquire lock: > ffff888035be1570 (&p->frag_sem){.+.+}-{4:4}, at: __configfs_open_file+0xe= 8/0x9c0 fs/configfs/file.c:304 >=20 > but task is already holding lock: > ffffffff91d84848 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlin= k/genetlink.c:1217 >=20 > which lock already depends on the new lock. >=20 >=20 > the existing dependency chain (in reverse order) is: >=20 > -> #3 (cb_lock){++++}-{4:4}: > lock_acquire kernel/locking/lockdep.c:5942 [inline] > lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 > down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574 > genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217 > netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] > netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1364 > netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1919 > sock_sendmsg_nosec net/socket.c:800 [inline] > __sock_sendmsg net/socket.c:815 [inline] > sock_sendmsg+0x394/0x410 net/socket.c:838 > splice_to_socket+0xb3c/0x11a0 fs/splice.c:884 > do_splice_from fs/splice.c:936 [inline] > do_splice+0x109c/0x1fa0 fs/splice.c:1349 > __do_splice+0x33b/0x370 fs/splice.c:1431 > __do_sys_splice fs/splice.c:1634 [inline] > __se_sys_splice fs/splice.c:1616 [inline] > __x64_sys_splice+0x187/0x250 fs/splice.c:1616 > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 > entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > -> #2 (&pipe->mutex){+.+.}-{4:4}: > lock_acquire kernel/locking/lockdep.c:5942 [inline] > lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 > __mutex_lock_common kernel/locking/mutex.c:646 [inline] > __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 > fifo_open+0x139/0xb40 fs/pipe.c:1235 > do_dentry_open+0x6ab/0x14d0 fs/open.c:996 > vfs_open+0x82/0x3f0 fs/open.c:1101 > do_open fs/namei.c:4866 [inline] > path_openat+0x19fa/0x2440 fs/namei.c:5029 > do_file_open+0x20e/0x430 fs/namei.c:5058 > file_open_name+0x1c3/0x3e0 fs/open.c:1375 > filp_open+0x2e/0x50 fs/open.c:1392 > fsg_lun_open+0x6b/0x7b0 drivers/usb/gadget/function/storage_common= .c:194 > fsg_store_file+0x1e7/0x450 drivers/usb/gadget/function/storage_com= mon.c:455 > flush_write_buffer fs/configfs/file.c:207 [inline] > configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229 > new_sync_write fs/read_write.c:595 [inline] > vfs_write+0x6af/0x1050 fs/read_write.c:687 > ksys_write+0x12a/0x250 fs/read_write.c:739 > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 > entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > -> #1 (&common->filesem){+.+.}-{4:4}: > lock_acquire kernel/locking/lockdep.c:5942 [inline] > lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 > down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631 > fsg_store_file+0x264/0x450 drivers/usb/gadget/function/storage_com= mon.c:452 > flush_write_buffer fs/configfs/file.c:207 [inline] > configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229 > new_sync_write fs/read_write.c:595 [inline] > vfs_write+0x6af/0x1050 fs/read_write.c:687 > ksys_write+0x12a/0x250 fs/read_write.c:739 > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 > entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > -> #0 (&p->frag_sem){.+.+}-{4:4}: > check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 > check_prevs_add kernel/locking/lockdep.c:3328 [inline] > validate_chain kernel/locking/lockdep.c:3952 [inline] > __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 > lock_acquire kernel/locking/lockdep.c:5942 [inline] > lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 > down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574 > __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304 > do_dentry_open+0x6ab/0x14d0 fs/open.c:996 > vfs_open+0x82/0x3f0 fs/open.c:1101 > do_open fs/namei.c:4866 [inline] > path_openat+0x19fa/0x2440 fs/namei.c:5029 > do_file_open+0x20e/0x430 fs/namei.c:5058 > file_open_name+0x1c3/0x3e0 fs/open.c:1375 > filp_open+0x2e/0x50 fs/open.c:1392 > kernel_read_file_from_path_initns+0xec/0x240 fs/kernel_read_file.c= :159 > fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549= [inline] > _request_firmware+0x733/0x13c0 drivers/base/firmware_loader/main.c= :873 > request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:948 > reg_reload_regdb+0x85/0x460 net/wireless/reg.c:1067 > genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114 > genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] > genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209 > netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2575 > genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218 > netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] > netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1364 > netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1919 > sock_sendmsg_nosec net/socket.c:800 [inline] > __sock_sendmsg net/socket.c:815 [inline] > sock_sendmsg+0x394/0x410 net/socket.c:838 > splice_to_socket+0xb3c/0x11a0 fs/splice.c:884 > do_splice_from fs/splice.c:936 [inline] > do_splice+0x109c/0x1fa0 fs/splice.c:1349 > __do_splice+0x33b/0x370 fs/splice.c:1431 > __do_sys_splice fs/splice.c:1634 [inline] > __se_sys_splice fs/splice.c:1616 [inline] > __x64_sys_splice+0x187/0x250 fs/splice.c:1616 > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 > entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > other info that might help us debug this: >=20 > Chain exists of: > &p->frag_sem --> &pipe->mutex --> cb_lock >=20 > Possible unsafe locking scenario: >=20 > CPU0 CPU1 > ---- ---- > rlock(cb_lock); > lock(&pipe->mutex); > lock(cb_lock); > rlock(&p->frag_sem); >=20 > *** DEADLOCK *** >=20 > locks held by syz-executor387/5997: 2, last CPU#0: > #0: ffff888035fc7860 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock fs/pipe.c= :91 [inline] > #0: ffff888035fc7860 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock+0x69/0x80= fs/pipe.c:88 > #1: ffffffff91d84848 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/n= etlink/genetlink.c:1217 >=20 > stack backtrace: > CPU: 0 UID: 0 PID: 5997 Comm: syz-executor387 Not tainted syzkaller #0 PR= EEMPT(full)=20 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.= 16.3-2 04/01/2014 > Call Trace: > > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 > print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2087 > check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2219 > check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 > check_prevs_add kernel/locking/lockdep.c:3328 [inline] > validate_chain kernel/locking/lockdep.c:3952 [inline] > __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 > lock_acquire kernel/locking/lockdep.c:5942 [inline] > lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 > down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574 > __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304 > do_dentry_open+0x6ab/0x14d0 fs/open.c:996 > vfs_open+0x82/0x3f0 fs/open.c:1101 > do_open fs/namei.c:4866 [inline] > path_openat+0x19fa/0x2440 fs/namei.c:5029 > do_file_open+0x20e/0x430 fs/namei.c:5058 > file_open_name+0x1c3/0x3e0 fs/open.c:1375 > filp_open+0x2e/0x50 fs/open.c:1392 > kernel_read_file_from_path_initns+0xec/0x240 fs/kernel_read_file.c:159 > fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inli= ne] > _request_firmware+0x733/0x13c0 drivers/base/firmware_loader/main.c:873 > request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:948 > reg_reload_regdb+0x85/0x460 net/wireless/reg.c:1067 > genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114 > genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] > genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209 > netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2575 > genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218 > netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] > netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1364 > netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1919 > sock_sendmsg_nosec net/socket.c:800 [inline] > __sock_sendmsg net/socket.c:815 [inline] > sock_sendmsg+0x394/0x410 net/socket.c:838 > splice_to_socket+0xb3c/0x11a0 fs/splice.c:884 > do_splice_from fs/splice.c:936 [inline] > do_splice+0x109c/0x1fa0 fs/splice.c:1349 > __do_splice+0x33b/0x370 fs/splice.c:1431 > __do_sys_splice fs/splice.c:1634 [inline] > __se_sys_splice fs/splice.c:1616 [inline] > __x64_sys_splice+0x187/0x250 fs/splice.c:1616 > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f7180644b5e > Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4= d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 90 41 57 41= 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08 > RSP: 002b:00007f717cde6f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 > RAX: ffffffffffffffda RBX: 00007f717cde76c0 RCX: 00007f7180644b5e > RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000011 > RBP: 00007f717cde6fe0 R08: 0000000000000014 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000012 > R13: 00007f717cde6f80 R14: 000000000000017e R15: 0000000000000010 > > faux_driver regulatory: loading /lib/firmware/regulatory.db failed with e= rror -26 > faux_driver regulatory: Direct firmware load for regulatory.db failed wit= h error -26 > faux_driver regulatory: Falling back to sysfs fallback for: regulatory.db >=20 >=20 > --- > 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.