linux-kernel - Re: SyS symbol munging.

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Message-ID: <20130510205622.GD9583@home.goodmis.org>
Date:	Fri, 10 May 2013 16:56:22 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: SyS symbol munging.

On Fri, May 10, 2013 at 09:05:03PM +0100, Al Viro wrote:
> On Fri, May 10, 2013 at 09:55:00PM +0200, Borislav Petkov wrote:
> > On Fri, May 10, 2013 at 12:35:10PM -0700, Andrew Morton wrote:
> > > I forget who did this initially and peeling back those layers with git
> > > is tiresome.
> > 
> > 1a94bc34768e4 from 2009, although those SyS* things started appearing in
> > stack traces only recently AFAIR.
> 
> Note that both sys_something and SyS_something end up in vmlinux symbol
> table, refering to the same address.  AFAICS, what matters is which one
> goes first.  May be even linker-dependent...

Actually, it's the first one that kallsyms finds in its binary search.

If the table is layed out a little differently, it may find the first
one or the second one.

-- Steve

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