linux-kernel - Re: [PATCH 4.4 041/241] cifs: fix strcat buffer overflow and reduce raciness in smb21_set_oplock

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Date:   Tue, 11 Jun 2019 09:20:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Shilovskiy <pshilov@...rosoft.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Christoph Probst <kernel@...bst.it>,
        Steven French <Steven.French@...rosoft.com>
Subject: Re: [PATCH 4.4 041/241] cifs: fix strcat buffer overflow and reduce
 raciness in smb21_set_oplock_level()

On Mon, Jun 10, 2019 at 07:13:24PM +0000, Pavel Shilovskiy wrote:
> 
> -----Original Message-----
> From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> 
> Sent: Sunday, June 9, 2019 9:40 AM
> To: linux-kernel@...r.kernel.org
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; stable@...r.kernel.org; Christoph Probst <kernel@...bst.it>; Pavel Shilovskiy <pshilov@...rosoft.com>; Steven French <Steven.French@...rosoft.com>
> Subject: [PATCH 4.4 041/241] cifs: fix strcat buffer overflow and reduce raciness in smb21_set_oplock_level()
> 
> From: Christoph Probst <kernel@...bst.it>
> 
> commit 6a54b2e002c9d00b398d35724c79f9fe0d9b38fb upstream.
> 
> Change strcat to strncpy in the "None" case to fix a buffer overflow when cinode->oplock is reset to 0 by another thread accessing the same cinode. It is never valid to append "None" to any other message.
> 
> Consolidate multiple writes to cinode->oplock to reduce raciness.
> 
> Signed-off-by: Christoph Probst <kernel@...bst.it>
> Reviewed-by: Pavel Shilovsky <pshilov@...rosoft.com>
> Signed-off-by: Steve French <stfrench@...rosoft.com>
> CC: Stable <stable@...r.kernel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> --------------------------------
> 
> Hi Greg,
> 
> This patch has been queued for 4.4.y and has already been merged into
> 5.1.y (5.1.5). Are you going to apply it to other stable kernels: 4.9,
> 4.14, 4.19?

It is already in the 4.9.179, 4.14.122, 4.19.46, 5.0.19, and 5.1.5
released kernels.  So I don't think I can merge it into them again :)

thanks,

greg k-h