CVE-2022-49296

published 2025-02-26

CVE-2022-49296: In the Linux kernel, the following vulnerability has been resolved: ceph: fix possible deadlock when holding Fwb to get inline_data 1, mount with wsync. 2…

Priority P4 22 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

ceph: fix possible deadlock when holding Fwb to get inline_data

1, mount with wsync.
2, create a file with O_RDWR, and the request was sent to mds.0:

ceph_atomic_open()-->
ceph_mdsc_do_request(openc)
finish_open(file, dentry, ceph_open)-->
ceph_open()-->
ceph_init_file()-->
ceph_init_file_info()-->
ceph_uninline_data()-->
{
...
if (inline_version == 1 || /* initial version, no data */
inline_version == CEPH_INLINE_NONE)
goto out_unlock;
...
}

The inline_version will be 1, which is the initial version for the
new create file. And here the ci->i_inline_version will keep with 1,
it's buggy.

3, buffer write to the file immediately:

ceph_write_iter()-->
ceph_get_caps(file, need=Fw, want=Fb, ...);
generic_perform_write()-->
a_ops->write_begin()-->
ceph_write_begin()-->
netfs_write_begin()-->
netfs_begin_read()-->
netfs_rreq_submit_slice()-->
netfs_read_from_server()-->
rreq->netfs_ops->issue_read()-->
ceph_netfs_issue_read()-->
{
...
if (ci->i_inline_version != CEPH_INLINE_NONE &&
ceph_netfs_issue_op_inline(subreq))
return;
...
}
ceph_put_cap_refs(ci, Fwb);

The ceph_netfs_issue_op_inline() will send a getattr(Fsr) request to
mds.1.

4, then the mds.1 will request the rd lock for CInode::filelock from
the auth mds.0, the mds.0 will do the CInode::filelock state transation
from excl --> sync, but it need to revoke the Fxwb caps back from the
clients.

While the kernel client has aleady held the Fwb caps and waiting for
the getattr(Fsr).

It's deadlock!

URL: https://tracker.ceph.com/issues/55377

Affected

11 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.5-1 (bookworm)	linux 5.18.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= 9030aaf9bf0a1eee47a154c316c789e959638b0f < 292b7a7275ce535a1abfa4dd0b2e586162aaae1e	292b7a7275ce535a1abfa4dd0b2e586162aaae1e
linux	linux	>= 9030aaf9bf0a1eee47a154c316c789e959638b0f < 825978fd6a0defc3c29d8a38b6cea76a0938d21e	825978fd6a0defc3c29d8a38b6cea76a0938d21e
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 2.6.34 < 5.18.4	5.18.4
msrc	cbl2_kernel_5.15.186.1-1_on_cbl_mariner_2.0	—	—
msrc	cbl2_kernel_5.15.200.1-1_on_cbl_mariner_2.0	—	—
msrc	cbl2_kernel_5.15.202.1-1_on_cbl_mariner_2.0	—	—

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_msrc 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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