ghsa-86m3-4q38-6prj
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
aoe: avoid potential deadlock at set_capacity
Move set_capacity() outside of the section procected by (&d->lock). To avoid possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
[1] lock(&bdev->bd_size_lock);
local_irq_disable();
[2] lock(&d->lock);
[3] lock(&bdev->bd_size_lock);
*** DEADLOCK ***
Where 1 hold by zram_add()->set_capacity(). [2]lock(&d->lock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc() is trying to acquire 3 at set_capacity() call. In this situation an attempt to acquire [4]lock(&d->lock) from aoecmd_cfg_rsp() will lead to deadlock.
So the simplest solution is breaking lock dependency 2 -> 3 by moving set_capacity() outside.
{
"affected": [],
"aliases": [
"CVE-2024-26775"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-04-03T17:15:53Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\naoe: avoid potential deadlock at set_capacity\n\nMove set_capacity() outside of the section procected by (\u0026d-\u003elock).\nTo avoid possible interrupt unsafe locking scenario:\n\n CPU0 CPU1\n ---- ----\n[1] lock(\u0026bdev-\u003ebd_size_lock);\n local_irq_disable();\n [2] lock(\u0026d-\u003elock);\n [3] lock(\u0026bdev-\u003ebd_size_lock);\n \u003cInterrupt\u003e\n[4] lock(\u0026d-\u003elock);\n\n *** DEADLOCK ***\n\nWhere [1](\u0026bdev-\u003ebd_size_lock) hold by zram_add()-\u003eset_capacity().\n[2]lock(\u0026d-\u003elock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc()\nis trying to acquire [3](\u0026bdev-\u003ebd_size_lock) at set_capacity() call.\nIn this situation an attempt to acquire [4]lock(\u0026d-\u003elock) from\naoecmd_cfg_rsp() will lead to deadlock.\n\nSo the simplest solution is breaking lock dependency\n[2](\u0026d-\u003elock) -\u003e [3](\u0026bdev-\u003ebd_size_lock) by moving set_capacity()\noutside.",
"id": "GHSA-86m3-4q38-6prj",
"modified": "2024-04-03T18:30:43Z",
"published": "2024-04-03T18:30:43Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26775"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19a77b27163820f793b4d022979ffdca8f659b77"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2d623c94fbba3554f4446ba6f3c764994e8b0d26"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/673629018ba04906899dcb631beec34d871f709c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e169bd4fb2b36c4b2bee63c35c740c85daeb2e86"
}
],
"schema_version": "1.4.0",
"severity": []
}