Red Hat Bugzilla – Bug 152399
CAN-2005-0400 ext2 mkdir() directory entry random kernel memory leak
Last modified: 2015-01-04 17:18:14 EST
A flaw was discovered in ext2 filesystem support affecting 2.4 and 2.6 kernels.
When a new directory is created, the ext2 block written to disk is initialized,
leading to an information leak.
The following script can easily show the problem on Linux 2.4 and 2.6:
dd if=/dev/zero of=$FILE bs=1k count=8192
mke2fs -F -b 1024 -m0 $FILE
mount -o loop $FILE mnt
for D in `seq 500` ; do mkdir mnt/$D ; done
Using 'strings foo' will reveal the information leak in the file.
Patch committed upstream, see
("is not initialized")
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.