linux-kernel - Re: [PATCH] params: Fix an overflow in param_attr

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Date:   Thu, 28 Sep 2017 10:11:08 +0200
From:   Jean Delvare <jdelvare@...e.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Baoquan He <bhe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] params: Fix an overflow in param_attr_show

On Thu, 28 Sep 2017 10:02:23 +0200, Jean Delvare wrote:
> On Wed, 27 Sep 2017 15:31:04 +0200, Ingo Molnar wrote:
> > At minimum I'd suggest aligning the definitions vertically, to make sure
> > any missing \n stands out more, visually:
> > 
> > STANDARD_PARAM_DEF(byte,	unsigned char,		"%hhu\n",	kstrtou8);
> > STANDARD_PARAM_DEF(short,	short,			"%hi\n",	kstrtos16);
> > STANDARD_PARAM_DEF(ushort,	unsigned short,		"%hu\n",	kstrtou16);
> > STANDARD_PARAM_DEF(int,	int,			"%i\n",		kstrtoint);
> > STANDARD_PARAM_DEF(uint,	unsigned int,		"%u\n",		kstrtouint);
> > STANDARD_PARAM_DEF(long,	long,			"%li\n",	kstrtol);
> > STANDARD_PARAM_DEF(ulong,	unsigned long,		"%lu\n",	kstrtoul);
> > STANDARD_PARAM_DEF(ullong,	unsigned long long,	"%llu\n",	kstrtoull);  
> 
> Sure it is possible to add a new parameter type. But why would the
> person adding it forget the \n? I can't imagine that someone adding a
> new type would type the new line of code character by character. Such an
> operation is calling for copy, paste and edit, at which point there is
> no reason why the \n would be actively deleted. Or this is sabotage,
> really ;-)
> 
> Aligning parameters vertically as you suggest above is probably a good
> idea for overall readability anyway, so I can change my patch to do
> that, as I am modifying these lines anyway. It is pretty much
> independent from the fix per se, but if it makes you happy...

Or... I could append the \n inside the STANDARD_PARAM_DEF macro, so the
calls are unchanged. Makes my patch smaller, and addresses your concern
just as well, I suppose.

-- 
Jean Delvare
SUSE L3 Support