linux-kernel - Re: [PATCH 1/3] tools/hv: Fix for long file names from readdir

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Message-ID: <1628506728.5754343.1355817969825.JavaMail.root@redhat.com>
Date:	Tue, 18 Dec 2012 03:06:09 -0500 (EST)
From:	Tomas Hozza <thozza@...hat.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com, kys@...rosoft.com
Subject: Re: [PATCH 1/3] tools/hv: Fix for long file names from readdir

----- Original Message -----
> > This is just for sanity. The value PATH_MAX was chosen after
> > discussion
> > with K. Y. Srinivasan and Olaf Hering instead of some "magic"
> > number like
> > 256 or 512.
> 
> PATH_MAX is a magic name.

It is defined in "limits.h". I would welcome some more constructive
argumentation and critics.

> > > Using snprintf() is a good idea, but you need to check the return
> > > value and handle the truncation case somehow.
> > 
> > By using PATH_MAX sized buffer there is no need for handling the
> > truncation
> > case.
>  
> You are claiming two contradictory things: sprintf() may overrun the
> buffer, so we need the length check provided by snprintf(), but there
> is no need to check for truncation because we know the length is
> sufficient.

So what do you propose? How should it be solved?

Thank you.

Regards,
Tomas Hozza
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