linux-kernel - Re: [Linux-kernel-mentees] [PATCH v3] media/v4l2-core: Fix kernel-infoleak in video_put

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Date:   Mon, 27 Jul 2020 11:30:32 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Vandana BN <bnvandana@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [Linux-kernel-mentees] [PATCH v3] media/v4l2-core: Fix
 kernel-infoleak in video_put_user()

On Mon, Jul 27, 2020 at 05:46:09PM +0300, Dan Carpenter wrote:
> On Mon, Jul 27, 2020 at 10:14:16AM -0400, Peilin Ye wrote:
> > Yes, I would like to! I will start from:
> > 
> > 	drivers/firewire/core-cdev.c:463
> 
> My prefered fix for this would be to add a memset at the start of
> fill_bus_reset_event().
> 
> 	memset(event, 0, sizeof(*event));
> 
> 	spin_lock_irq(&card->lock);
> 
> 	event->closure       = client->bus_reset_closure;
> 
> 
> > 	drivers/input/misc/uinput.c:743

I just sent a patch to fix this as you suggested.

> I don't think this is a bug.

I see. I am now fixing:

	block/scsi_ioctl.c:707 scsi_put_cdrom_generic_arg() warn: check that 'cgc32' doesn't leak information (struct has a hole after 'data_direction')