Informazioni sul CVE-2024-42105

nilfs2: fix inode number range checks

CWE ID: N/A

Base Score (CVSS): N/A

CVE: CVE-2024-42105

Descrizione: In kernel Linux, the following vulnerability has been resolved: nilfs2: fix inode number range checks Patch series “nilfs2: fix potential issues related to reserved inodes”. This series addresses one reported use-after-free issue by syzbot, caused by nilfs2’s internal inode being exposed in the filesystem namespace, and a couple of flaws that cause problems if the starting number of non-reserved inodes written in the on-disk super block is intentionally (or corruptly) changed from its default value. This patch (of 3): In the current implementation of nilfs2, “nilfs->ns_first_ino”, which gives the first non-reserved inode number, is read from the superblock, but its lower limit is not checked. As a result, if a number that overlaps with the inode number range of reserved inodes (like the root directory or metadata files) is set in the superblock parameter, the inode number test macros (NILFS_MDT_INODE and NILFS_VALID_INODE) will not function properly. Furthermore, these test macros use left bit-shift calculations using with the inode number as the shift count via the BIT macro, but the result of a shift calculation that exceeds the bit width of an integer is undefined in the C specification, so if “ns_first_ino” is set to a large value other than the default NILFS_USER_INO (=11), the macros may potentially malfunction depending on the environment. Fix these issues by checking the lower bound of “nilfs->ns_first_ino” and by preventing bit shifts equal to or greater than the NILFS_USER_INO constant in the inode number test macros. Also, change the type of “ns_first_ino” from signed integer to unsigned integer to avoid the need for type casting in comparisons such as the lower bound check introduced this time.

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  • Linux – Linux
  • Linux – Linux

Relazioni con altri prodotti

Produttore:Linux
Prodotto: Linux
Anno: 2024
CWE:
CVSS: 0.0

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