Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: use latest_dev in btrfs_show_devname The test case btrfs/238 reports the warning below: WARNING: CPU: 3 PID: 481 at fs/btrfs/super.c:2509 btrfs_show_devname+0x104/0x1e8 [btrfs] CPU: 2 PID: 1 Comm: systemd Tainted: G W O 5.14.0-rc1-custom #72 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 Call trace: btrfs_show_devname+0x108/0x1b4 [btrfs] show_mountinfo+0x234/0x2c4 m_show+0x28/0x34 seq_read_iter+0x12c/0x3c4 vfs_read+0x29c/0x2c8 ksys_read+0x80/0xec __arm64_sys_read+0x28/0x34 invoke_syscall+0x50/0xf8 do_el0_svc+0x88/0x138 el0_svc+0x2c/0x8c el0t_64_sync_handler+0x84/0xe4 el0t_64_sync+0x198/0x19c Reason: While btrfs_prepare_sprout() moves the fs_devices::devices into fs_devices::seed_list, the btrfs_show_devname() searches for the devices and found none, leading to the warning as in above. Fix: latest_dev is updated according to the changes to the device list. That means we could use the latest_dev->name to show the device name in /proc/self/mounts, the pointer will be always valid as it's assigned before the device is deleted from the list in remove or replace. The RCU protection is sufficient as the device structure is freed after synchronization.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

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CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  4.7 MEDIUM

Vector:  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://git.kernel.org/stable/c/6605fd2f394bba0a0059df2b6cfc87b0b6d393a2	Patch
https://git.kernel.org/stable/c/e342c2558016ead462f376b6c6c2ac5efc17f3b1	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-362	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')	NIST

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Change History

2 change records found show changes

Initial Analysis by NIST 10/31/2024 9:36:53 AM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.15.11
Added	CVSS V3.1		NIST AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE		NIST CWE-362
Changed	Reference Type	https://git.kernel.org/stable/c/6605fd2f394bba0a0059df2b6cfc87b0b6d393a2 No Types Assigned	https://git.kernel.org/stable/c/6605fd2f394bba0a0059df2b6cfc87b0b6d393a2 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/e342c2558016ead462f376b6c6c2ac5efc17f3b1 No Types Assigned	https://git.kernel.org/stable/c/e342c2558016ead462f376b6c6c2ac5efc17f3b1 Patch

New CVE Received by NIST 6/19/2024 11:15:54 AM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 1307 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: btrfs: use latest_dev in btrfs_show_devname The test case btrfs/238 reports the warning below: WARNING: CPU: 3 PID: 481 at fs/btrfs/super.c:2509 btrfs_show_devname+0x104/0x1e8 [btrfs] CPU: 2 PID: 1 Comm: systemd Tainted: G W O 5.14.0-rc1-custom #72 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 Call trace: btrfs_show_devname+0x108/0x1b4 [btrfs] show_mountinfo+0x234/0x2c4 m_show+0x28/0x34
Added	Reference		kernel.org https://git.kernel.org/stable/c/6605fd2f394bba0a0059df2b6cfc87b0b6d393a2 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/e342c2558016ead462f376b6c6c2ac5efc17f3b1 [No types assigned]