netdev - Re: [iproute PATCH] ip netns: Make sure netns name is sane

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Message-ID: <20170712123822.GU16375@orbyte.nwl.cc>
Date:   Wed, 12 Jul 2017 14:38:22 +0200
From:   Phil Sutter <phil@....cc>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [iproute PATCH] ip netns: Make sure netns name is sane

On Mon, Jul 10, 2017 at 08:17:02AM -0700, Stephen Hemminger wrote:
> On Mon, 10 Jul 2017 13:19:12 +0200
> Phil Sutter <phil@....cc> wrote:
> 
> > +static bool is_basename(const char *name)
> > +{
> > +	char *name_dup = strdup(name);
> > +	bool rc = true;
> > +
> > +	if (!name_dup)
> > +		return false;
> > +
> > +	if (strcmp(basename(name_dup), name))
> > +		rc = false;
> > +
> > +	free(name_dup);
> > +	return rc;
> > +}
> 
> Why not just:
> 
> static bool is_basename(const char *name)
> {
> 	return strchr(name '/') == NULL;
> }

This is not sufficient since it doesn't cover netns names of '..' and
'.', as Matteo correctly pointed out.

Cheers, Phil