linux-kernel - Re: [PATCH] fs: cifs: cifsencrypt.c: Cleaning up missing null-terminate in conjunction with strncpy

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Message-ID: <1407025666.1835.16.camel@joe-AO725>
Date:	Sat, 02 Aug 2014 17:27:46 -0700
From:	Joe Perches <joe@...ches.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Shirish Pargaonkar <shirishpargaonkar@...il.com>,
	Steve French <sfrench@...ba.org>,
	linux-cifs <linux-cifs@...r.kernel.org>,
	samba-technical <samba-technical@...ts.samba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs: cifs: cifsencrypt.c: Cleaning up missing
 null-terminate in conjunction with strncpy

On Sun, 2014-08-03 at 01:13 +0200, Rickard Strandqvist wrote:
> 2014-08-02 19:33 GMT+02:00 Joe Perches <joe@...ches.com>:
> > On Sat, 2014-08-02 at 11:55 -0500, Shirish Pargaonkar wrote:
> >> Acked-by: Shirish Pargaonkar <spargaonkar@...e.com>
> > []
> >> > diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
> > []
> >> > @@ -307,7 +307,7 @@ int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
> >> >
> >> >         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
> >> >         if (password)
> >> > -               strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
> >> > +               strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE - 1);
> >
> >
> > Is this always correct?
[]
> Because password_with_pad gets set to all zeros above, the character,
> I do not guarantee a copy terminating null.
> Unless it is so that you do not want any terminating null.

That's the question for Steve and cifs people.

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