linux-kernel - Re: [PATCH] basic perf support for sparc

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Message-ID: <20090812181305.GQ12579@kernel.dk>
Date:	Wed, 12 Aug 2009 20:13:05 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	fweisbec@...il.com, mingo@...e.hu
Subject: Re: [PATCH] basic perf support for sparc

On Wed, Aug 12 2009, David Miller wrote:
> From: Jens Axboe <jens.axboe@...cle.com>
> Date: Thu, 6 Aug 2009 09:02:42 +0200
> 
> > On Sun, Aug 02 2009, David Miller wrote:
> >> From: Jens Axboe <jens.axboe@...cle.com>
> >> Date: Wed, 29 Jul 2009 13:25:10 +0200
> >> 
> >> > -#define NR_SYSCALLS		327
> >> > +#define NR_SYSCALLS		328
> >> 
> >> When you increase this value, you have to add entries to all of the
> >> syscall tables.  The syscall dispatch checks against this as a limit,
> >> so if you don't explicitly add an entry to all the tables, it's
> >> possible to deref garbage past the end of the table and try to jump to
> >> it as a syscall.
> > 
> > Oops, missed the 32-bit table. Does the below look better?
> 
> I'll take a look at this as soon as I can Jens, sorry for taking
> so long.

No problem, I figured you'd get to it eventually and in the mean time
I'll just keep patching it in.

-- 
Jens Axboe

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