Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fs: Pass AT_GETATTR_NOSEC flag to getattr interface function When vfs_getattr_nosec() calls a filesystem's getattr interface function then the 'nosec' should propagate into this function so that vfs_getattr_nosec() can again be called from the filesystem's gettattr rather than vfs_getattr(). The latter would add unnecessary security checks that the initial vfs_getattr_nosec() call wanted to avoid. Therefore, introduce the getattr flag GETATTR_NOSEC and allow to pass with the new getattr_flags parameter to the getattr interface function. In overlayfs and ecryptfs use this flag to determine which one of the two functions to call. In a recent code change introduced to IMA vfs_getattr_nosec() ended up calling vfs_getattr() in overlayfs, which in turn called security_inode_getattr() on an exiting process that did not have current->fs set anymore, which then caused a kernel NULL pointer dereference. With this change the call to security_inode_getattr() can be avoided, thus avoiding the NULL pointer dereference.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7 before 3fb0fa08641903304b9d81d52a379ff031dc41d4; affected db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7 before 8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf |
| Linux / Linux | affected 6.5; unaffected 0 before 6.5; unaffected 6.6.4 through 6.6.*; unaffected 6.7 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4
- https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.