GHSA-HX29-FW56-X5WJ
Vulnerability from github – Published: 2024-02-27 21:31 – Updated: 2024-04-10 21:30In the Linux kernel, the following vulnerability has been resolved:
ext4: always panic when errors=panic is specified
Before commit 014c9caa29d3 ("ext4: make ext4_abort() use __ext4_error()"), the following series of commands would trigger a panic:
- mount /dev/sda -o ro,errors=panic test
- mount /dev/sda -o remount,abort test
After commit 014c9caa29d3, remounting a file system using the test mount option "abort" will no longer trigger a panic. This commit will restore the behaviour immediately before commit 014c9caa29d3. (However, note that the Linux kernel's behavior has not been consistent; some previous kernel versions, including 5.4 and 4.19 similarly did not panic after using the mount option "abort".)
This also makes a change to long-standing behaviour; namely, the following series commands will now cause a panic, when previously it did not:
- mount /dev/sda -o ro,errors=panic test
- echo test > /sys/fs/ext4/sda/trigger_fs_error
However, this makes ext4's behaviour much more consistent, so this is a good thing.
{
"affected": [],
"aliases": [
"CVE-2021-46945"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-27T19:04:06Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: always panic when errors=panic is specified\n\nBefore commit 014c9caa29d3 (\"ext4: make ext4_abort() use\n__ext4_error()\"), the following series of commands would trigger a\npanic:\n\n1. mount /dev/sda -o ro,errors=panic test\n2. mount /dev/sda -o remount,abort test\n\nAfter commit 014c9caa29d3, remounting a file system using the test\nmount option \"abort\" will no longer trigger a panic. This commit will\nrestore the behaviour immediately before commit 014c9caa29d3.\n(However, note that the Linux kernel\u0027s behavior has not been\nconsistent; some previous kernel versions, including 5.4 and 4.19\nsimilarly did not panic after using the mount option \"abort\".)\n\nThis also makes a change to long-standing behaviour; namely, the\nfollowing series commands will now cause a panic, when previously it\ndid not:\n\n1. mount /dev/sda -o ro,errors=panic test\n2. echo test \u003e /sys/fs/ext4/sda/trigger_fs_error\n\nHowever, this makes ext4\u0027s behaviour much more consistent, so this is\na good thing.",
"id": "GHSA-hx29-fw56-x5wj",
"modified": "2024-04-10T21:30:28Z",
"published": "2024-02-27T21:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46945"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995"
}
],
"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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