linux-kernel - [PATCH 0/2] sysctl: fix incorrect write position handling

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Date:	Tue, 18 Mar 2014 10:17:58 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Aaron Tomlin <atomlin@...hat.com>,
	Andrew Shewmaker <agshew@...il.com>,
	Li Zefan <lizefan@...wei.com>,
	Dario Faggioli <raistlin@...ux.it>,
	Andi Kleen <ak@...ux.intel.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: [PATCH 0/2] sysctl: fix incorrect write position handling

This creates a series of tests designed to examine the behavior of sysctl
write behavior, and corrects some unexpected side-effects of the current
file offset handling when writing sysctls. Namely, short appends don't
work and multiple writes (with incremented file position) rewrite the
sysctl string contents.

-Kees

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