linux-kernel - RE: [PATCH] cifs: fix strcat buffer overflow in smb21_set_oplock

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Message-ID: <e83726b3537a46fa84249c4caabbe839@AcuMS.aculab.com>
Date:   Tue, 7 May 2019 11:02:17 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Christoph Probst' <kernel@...bst.it>,
        Steve French <smfrench@...il.com>
CC:     Pavel Shilovsky <pavel.shilovsky@...il.com>,
        Jeremy Allison <jra@...ba.org>,
        Steve French <sfrench@...ba.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        samba-technical <samba-technical@...ts.samba.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] cifs: fix strcat buffer overflow in
 smb21_set_oplock_level()

From: Christoph Probst
> Sent: 07 May 2019 07:10
> Steve French schrieb am 06.05.2019 um 23:18 Uhr:
> 
> > On Mon, May 6, 2019 at 2:03 PM Pavel Shilovsky
> > <pavel.shilovsky@...il.com> wrote:
> > >
> > > The patch itself is fine but I think we have a bigger problem here:
> >
> > Good point.  Perhaps make update to the same patch to include both changes
> 
> I'll update my patch to implement the change suggested by Pavel.
> 
> I'll also switch the strcat to strncat and use strncpy in the "None"-case.

strncat() is never the function you are looking for.
The 'n' is the maximum number of bytes to copy, not the length
of the target buffer.

	David

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