Bug 152399
| Summary: | CAN-2005-0400 ext2 mkdir() directory entry random kernel memory leak | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | Mark J. Cox <mjc> |
| Component: | kernel | Assignee: | Dave Jones <davej> |
| Status: | CLOSED ERRATA | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 4.0 | CC: | jbaron, pfrields, riel |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | source=vendorsec,public=20050321,reported=20050321,impact=moderate | ||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2005-04-19 18:52:27 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
("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. http://rhn.redhat.com/errata/RHSA-2005-366.html |
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: #!/bin/sh FILE=foo 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 umount mnt Using 'strings foo' will reveal the information leak in the file. Patch committed upstream, see fixed=2.6-bk (20050325 http://linux.bkbits.net:8080/linux-2.6/cset@4244bfc9vHVlT4nv2o4ys4_sf6vzKA fixed=2.4-bk (20050325 http://linux.bkbits.net:8080/linux-2.4/cset@424473284plfEOB185qmyHPQyNPq4Q)