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

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Message-Id: <20090802.131705.81498579.davem@davemloft.net>
Date:	Sun, 02 Aug 2009 13:17:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jens.axboe@...cle.com
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

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.

And if you somehow arrange for adding a compat syscall entry here for
this, and build the perf tools 32-bit, you can forego all of these
rediculious issues with trying to get a 64-bit BFD library.  If the
perf tools are written portably and use types like u64 etc. for
holding addresses and similar things, this should not be an issue.

The 32-bit sparc BFD library has full support for all the 64-bit
binary formats and whatnot.
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