Description
In the Linux kernel, the following vulnerability has been resolved: ext4: do not create EA inode under buffer lock ext4_xattr_set_entry() creates new EA inodes while holding buffer lock on the external xattr block. This is problematic as it nests all the allocation locking (which acquires locks on other buffers) under the buffer lock. This can even deadlock when the filesystem is corrupted and e.g. quota file is setup to contain xattr block as data block. Move the allocation of EA inode out of ext4_xattr_set_entry() into the callers.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
e50e5129f384ae282adebfb561189cdb19b81cee to < 0752e7fb549d90c33b4d4186f11cfd25a556d1ddaffectede50e5129f384ae282adebfb561189cdb19b81cee to < 737fb7853acd5bc8984f6f42e4bfba3334be8ae1affectede50e5129f384ae282adebfb561189cdb19b81cee to < 111103907234bffd0a34fba070ad9367de058752affectede50e5129f384ae282adebfb561189cdb19b81cee to < 0a46ef234756dca04623b7591e8ebb3440622f0baffected
Linux Linux
Default version status: affected
4.13affected0 to < 4.13unaffected6.1.107 to ≤ 6.1.*unaffected6.6.47 to ≤ 6.6.*unaffected6.9.7 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/0752e7fb549d90c33b4d4186f11cfd25a556d1dd ↗
- https://git.kernel.org/stable/c/737fb7853acd5bc8984f6f42e4bfba3334be8ae1 ↗
- https://git.kernel.org/stable/c/111103907234bffd0a34fba070ad9367de058752 ↗
- https://git.kernel.org/stable/c/0a46ef234756dca04623b7591e8ebb3440622f0b ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗