linux-kernel - Re: [PATCH] strscpy: zero any trailing garbage bytes in the destination

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Message-ID: <56140624.80801@ezchip.com>
Date:	Tue, 6 Oct 2015 13:34:28 -0400
From:	Chris Metcalf <cmetcalf@...hip.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] strscpy: zero any trailing garbage bytes in the
 destination

On 10/06/2015 12:47 PM, Chris Metcalf wrote:
> It's possible that the destination can be shadowed in userspace
> (as, for example, the perf buffers are now).  So we should take
> care not to leak data that could be inspected by userspace.

Oops, we need to ensure platforms all have zero_bytemask()
before we can do this.  It's pretty trivial in general, but not all
platforms have it now.  I'll post a patch to fix this as needed,
which should be taken before this patch to avoid git bisect
failures.

I'll also see about fixing some skew in platforms that are
either newer than the patch (h8300) or added word-at-a-time.h
since the original patch (powerpc, tile).

-- 
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com

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