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Date: Thu, 13 Nov 2014 16:19:52 +0100
From: Petr Matousek <>
Subject: CVE-2014-7843 Linux kernel: aarch64: copying from /dev/zero causes
 local DoS

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:


Petr Matousek / Red Hat Product Security
PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3  D874 3E78 6F42 C449 77CA

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