[Linux-kernel-mentees] [PATCH 0/3] Prevent out-of-bounds access for built-in font data buffers

Peilin Ye yepeilin.cs at gmail.com
Fri Sep 25 15:35:09 UTC 2020

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

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