- Vulnerability/
- CVE-2024-42304
CVE-2024-42304: ext4: make sure the first directory block is not a hole
First published: Sat Aug 17 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1
- https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a
- https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523ac
- https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5
- https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe
- https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136
- https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa
- https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42304
- https://nvd.nist.gov/vuln/detail/CVE-2024-42304
- https://launchpad.net/bugs/cve/CVE-2024-42304
- https://security-tracker.debian.org/tracker/CVE-2024-42304
- https://ubuntu.com/security/CVE-2024-42304
- https://git.kernel.org/linus/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6
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