linux-kernel - Re: [PATCH 0/3] Prevent out-of-bounds access for built-in font data buffers

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Message-ID: <20200925153509.GA895804@PWN>
Date:   Fri, 25 Sep 2020 11:35:09 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Prevent out-of-bounds access for built-in font data
 buffers

On Fri, Sep 25, 2020 at 03:25:51PM +0200, Daniel Vetter wrote:
> I think the only way to make this work is that we have one place which
> takes in the userspace uapi struct, and then converts it once into a
> kernel_console_font. With all the error checking.

Ah, I didn't think of that! When trying to introduce
`kernel_console_font` I ended up using the uapi version and the kernel
version in parallel...

> Then all internal code deals in terms of kernel_console_font, with
> properly typed and named struct members and helper functions and
> everything. And we might need a gradual conversion for this, so that first
> we can convert over invidual console drivers, then subsystems, until at
> the end we've pushed the conversion from uapi array to kernel_console_font
> all the way to the ioctl entry points.
> 
> But that's indeed a huge pile of work, and fair warning: fbcon is
> semi-orphaned, so by doing this you'll pretty much volunteer for
> maintainership :-)
>
> But I'd be very happy to help get this done and throw some maintainership
> credentials at you in the proces ...

Sounds exciting, I will be glad to do this! I'm just a beginner, but I
will try to do what I can do.

Thank you,
Peilin Ye