ghsa-v546-2fcj-rwvx
Vulnerability from github
Published
2024-08-17 09:30
Modified
2024-08-19 06:30
Details
In the Linux kernel, the following vulnerability has been resolved:
ext4: make sure the first directory block is not a hole
The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow.
ext4_mknod
...
ext4_add_entry
// Read block 0
ext4_read_dirblock(dir, block, DIRENT)
bh = ext4_bread(NULL, inode, block, 0)
if (!bh && (type == INDEX || type == DIRENT_HTREE))
// The first directory block is a hole
// But type == DIRENT, so no error is reported.
After that, we get a directory block without '.' and '..' but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash.
Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.
{
"affected": [],
"aliases": [
"CVE-2024-42304"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-08-17T09:15:10Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: make sure the first directory block is not a hole\n\nThe syzbot constructs a directory that has no dirblock but is non-inline,\ni.e. the first directory block is a hole. And no errors are reported when\ncreating files in this directory in the following flow.\n\n ext4_mknod\n ...\n ext4_add_entry\n // Read block 0\n ext4_read_dirblock(dir, block, DIRENT)\n bh = ext4_bread(NULL, inode, block, 0)\n if (!bh \u0026\u0026 (type == INDEX || type == DIRENT_HTREE))\n // The first directory block is a hole\n // But type == DIRENT, so no error is reported.\n\nAfter that, we get a directory block without \u0027.\u0027 and \u0027..\u0027 but with a valid\ndentry. This may cause some code that relies on dot or dotdot (such as\nmake_indexed_dir()) to crash.\n\nTherefore when ext4_read_dirblock() finds that the first directory block\nis a hole report that the filesystem is corrupted and return an error to\navoid loading corrupted data from disk causing something bad.",
"id": "GHSA-v546-2fcj-rwvx",
"modified": "2024-08-19T06:30:53Z",
"published": "2024-08-17T09:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42304"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523ac"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6"
}
],
"schema_version": "1.4.0",
"severity": []
}
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