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:   Mon, 10 Jun 2019 19:13:24 +0000
From:   Pavel Shilovskiy <pshilov@...rosoft.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "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()


-----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?

Best regards,
Pavel Shilovsky