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Date: Thu, 15 Dec 2011 17:03:30 +0800
From: Eugene Teo <>
CC: "Steven M. Christey" <>
Subject: CVE request - kernel: perf, powerpc: Handle events that raise an
 exception without overflowing

This does not affect the upstream kernel as it is already fixed. This is
an issue that was introduced when fixing

A PMC is 32 bits (ie an int). When we pass it around as an unsigned
long, we need to cast it before doing the comparison. Using perf on
power machine with a local, unprivileged user account can cause a denial
of service.

Upstream commit:


Thanks, Eugene

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