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Date: Wed, 15 Apr 2009 02:13:54 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Joe Perches <joe@perches.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
       Zhaolei <zhaolei@cn.fujitsu.com>, Tom Zanussi <tzanussi@gmail.com>,
       Li Zefan <lizf@cn.fujitsu.com>, LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] vsprintf: introduce %pf
Message-ID: <20090415001353.GH5968@nowhere>
References: <1239753659-11790-1-git-send-email-fweisbec@gmail.com> <1239754196.28331.1.camel@localhost>
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On Tue, Apr 14, 2009 at 05:09:56PM -0700, Joe Perches wrote:
> On Wed, 2009-04-15 at 02:00 +0200, Frederic Weisbecker wrote:
> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > index b56f6d0..15c9094 100644
> > --- a/lib/vsprintf.c
> > +++ b/lib/vsprintf.c
> > @@ -575,12 +575,15 @@ static char *string(char *buf, char *end, char *s, struct printf_spec spec)
> >  }
> >  
> >  static char *symbol_string(char *buf, char *end, void *ptr,
> > -				struct printf_spec spec)
> > +				struct printf_spec spec, char ext)
> >  {
> >  	unsigned long value = (unsigned long) ptr;
> >  #ifdef CONFIG_KALLSYMS
> >  	char sym[KSYM_SYMBOL_LEN];
> > -	sprint_symbol(sym, value);
> > +	if (ext != 'f')
> > +		sprint_symbol(sym, value);
> > +	else
> > +		kallsyms_lookup(value, NULL, NULL, NULL, sym);
> 
> buffer overflow waiting to happen yes?


But a symbol is not supposed to exceed KSYM_SYMBOL_LEN. 

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