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Bug 1163744 - (CVE-2014-7843) CVE-2014-7843 kernel: aarch64: copying from /dev/zero causes local DoS
CVE-2014-7843 kernel: aarch64: copying from /dev/zero causes local DoS
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20141113,repor...
: Security
Depends On: 1161020 1163745
Blocks: 1163133
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Reported: 2014-11-13 07:00 EST by Petr Matousek
Modified: 2015-02-16 10:52 EST (History)
32 users (show)

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Doc Type: Bug Fix
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Last Closed: 2014-11-13 07:02:02 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2014-11-13 07:00:25 EST 
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 07:02:02 EST 
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 07:02:36 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1163745]
Comment 3 Fedora Update System 2014-11-18 07:17:35 EST 
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 18:04:02 EST 
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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