linux-kernel - Re: [PATCH] ext4: Prevent stack overrun in ext4_file_open when recording last known mountpoint

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Message-ID: <m239fwfk4k.fsf@firstfloor.org>
Date:	Fri, 16 Sep 2011 10:54:35 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	djwong@...ibm.com
Cc:	"Theodore Ts'o" <tytso@....edu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: Prevent stack overrun in ext4_file_open when recording last known mountpoint

"Darrick J. Wong" <djwong@...ibm.com> writes:


> Writing stack variables into the superblock doesn't sound like a great idea, so
> use strncpy instead.

This means you can end up with a non 0 terminated path in the
superblock, which could confuse programs.

Better use strlcpy()

strncpy is usually a bad idea, it's semantics overall are quite
bogus and it's also inefficient because it always fills.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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