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
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2014-7843
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1161020 1163745
Blocks: 1163133
TreeView+ depends on / blocked
 
Reported: 2014-11-13 12:00 UTC by Petr Matousek
Modified: 2023-05-12 05:48 UTC (History)
32 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-11-13 12:02:02 UTC
Embargoed:

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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.
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