GHSA-CF96-W592-HC5W
Vulnerability from github – Published: 2024-05-17 15:31 – Updated: 2025-09-19 15:31In the Linux kernel, the following vulnerability has been resolved:
btrfs: zoned: fix lock ordering in btrfs_zone_activate()
The btrfs CI reported a lockdep warning as follows by running generic generic/129.
WARNING: possible circular locking dependency detected 6.7.0-rc5+ #1 Not tainted
kworker/u5:5/793427 is trying to acquire lock: ffff88813256d028 (&cache->lock){+.+.}-{2:2}, at: btrfs_zone_finish_one_bg+0x5e/0x130 but task is already holding lock: ffff88810a23a318 (&fs_info->zone_active_bgs_lock){+.+.}-{2:2}, at: btrfs_zone_finish_one_bg+0x34/0x130 which lock already depends on the new lock.
the existing dependency chain (in reverse order) is: -> #1 (&fs_info->zone_active_bgs_lock){+.+.}-{2:2}: ... -> #0 (&cache->lock){+.+.}-{2:2}: ...
This is because we take fs_info->zone_active_bgs_lock after a block_group's lock in btrfs_zone_activate() while doing the opposite in other places.
Fix the issue by expanding the fs_info->zone_active_bgs_lock's critical section and taking it before a block_group's lock.
{
"affected": [],
"aliases": [
"CVE-2023-52668"
],
"database_specific": {
"cwe_ids": [
"CWE-667"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-17T14:15:09Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix lock ordering in btrfs_zone_activate()\n\nThe btrfs CI reported a lockdep warning as follows by running generic\ngeneric/129.\n\n WARNING: possible circular locking dependency detected\n 6.7.0-rc5+ #1 Not tainted\n ------------------------------------------------------\n kworker/u5:5/793427 is trying to acquire lock:\n ffff88813256d028 (\u0026cache-\u003elock){+.+.}-{2:2}, at: btrfs_zone_finish_one_bg+0x5e/0x130\n but task is already holding lock:\n ffff88810a23a318 (\u0026fs_info-\u003ezone_active_bgs_lock){+.+.}-{2:2}, at: btrfs_zone_finish_one_bg+0x34/0x130\n which lock already depends on the new lock.\n\n the existing dependency chain (in reverse order) is:\n -\u003e #1 (\u0026fs_info-\u003ezone_active_bgs_lock){+.+.}-{2:2}:\n ...\n -\u003e #0 (\u0026cache-\u003elock){+.+.}-{2:2}:\n ...\n\nThis is because we take fs_info-\u003ezone_active_bgs_lock after a block_group\u0027s\nlock in btrfs_zone_activate() while doing the opposite in other places.\n\nFix the issue by expanding the fs_info-\u003ezone_active_bgs_lock\u0027s critical\nsection and taking it before a block_group\u0027s lock.",
"id": "GHSA-cf96-w592-hc5w",
"modified": "2025-09-19T15:31:07Z",
"published": "2024-05-17T15:31:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52668"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1908e9d01e5395adff68d9d308a0fb15337e6272"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6f74989f5909cdec9b1274641f0fa306b15bb476"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b18f3b60b35a8c01c9a2a0f0d6424c6d73971dc3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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