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From: Jonathan Nieder <jrnieder@gmail.com>
To: "Carlos Martín Nieto" <cmn@elego.de>
Cc: git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH] valgrind: ignore SSE-based strlen invalid reads
Date: Wed, 16 Mar 2011 04:56:32 -0500	[thread overview]
Message-ID: <20110316095632.GA8277@elie> (raw)
In-Reply-To: <1300267874-15365-1-git-send-email-cmn@elego.de>

Hi Carlos,

Carlos Martín Nieto wrote:

> The C library uses SSE instructions to make strlen (among others)
> faster, loading 4 bytes at a time and reading past the end of the
> allocated memory. This read is safe and when the strlen function is
> inlined, it is (obviously) not replaced by valgrind, which reports a
> false-possitive.

It would be GCC rather than the C library if the strlen is inlined, I
think.  Is this a distinct bug from
<http://bugs.kde.org/show_bug.cgi?id=266961>?  Has it been filed
with the valgrind maintainers?

Thanks,
Jonathan

  reply	other threads:[~2011-03-16  9:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-16  9:31 [PATCH] valgrind: ignore SSE-based strlen invalid reads Carlos Martín Nieto
2011-03-16  9:56 ` Jonathan Nieder [this message]
2011-03-16 10:41   ` Carlos Martín Nieto
2011-03-16 10:47   ` Carlos Martín Nieto
2011-03-16 10:52     ` Jonathan Nieder
2011-03-16 11:10       ` Carlos Martín Nieto
2011-03-16 11:25         ` Jonathan Nieder
2011-03-16 11:46           ` Carlos Martín Nieto
2011-03-16 20:18             ` Junio C Hamano
2011-03-16 20:44               ` Carlos Martín Nieto
2011-03-16 22:43         ` Andreas Schwab

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