Bug 1163744 (CVE-2014-7843) - CVE-2014-7843 kernel: aarch64: copying from /dev/zero causes local DoS
Summary: CVE-2014-7843 kernel: aarch64: copying from /dev/zero causes local DoS
Status: CLOSED NOTABUG
Alias: CVE-2014-7843
Product: Security Response
Classification: Other
Component: vulnerability   
(Show other bugs)
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20141113,repor...
Keywords: Security
Depends On: 1161020 1163745
Blocks: 1163133
TreeView+ depends on / blocked
 
Reported: 2014-11-13 12:00 UTC by Petr Matousek
Modified: 2015-02-16 15:52 UTC (History)
32 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 2014-11-13 12:02:02 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)

Description Petr Matousek 2014-11-13 12:00:25 UTC
It was found that a read of n*PAGE_SIZE+1 from /dev/zero
will cause the kernel to panic due to an unhandled exception since it's
not handling the single byte case with a fixup (anything larger than a
single byte will properly fault.)

A local, unprivileged user could use this flaw to crash the system.

Upstream patch proposal:

https://lkml.org/lkml/2014/11/12/584

Acknowledgements:

This issue was discovered by Miloš Prchlík of Red Hat.

Comment 1 Petr Matousek 2014-11-13 12:02:02 UTC
Statement CVE-2014-7825:

Not vulnerable.

This issue does not affect the Linux kernel packages as shipped with Red Hat
Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.

Comment 2 Petr Matousek 2014-11-13 12:02:36 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1163745]

Comment 3 Fedora Update System 2014-11-18 12:17:35 UTC
kernel-3.17.3-300.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2014-11-20 23:04:02 UTC
kernel-3.17.3-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.


Note You need to log in before you can comment on or make changes to this bug.