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From:   Daniel Vetter <daniel@ffwll.ch>
Date:   Sun, 18 Oct 2020 22:33:11 +0200
Message-ID: <CAKMK7uFEmNnBdpoHYqvCUYS=nxh99gKs6P1-1pgp-ouvTSioGw@mail.gmail.com>
Subject: Re: [PATCH 1/2] Fonts: Support FONT_EXTRA_WORDS macros for font_6x8
To:     Peilin Ye <yepeilin.cs@gmail.com>
Cc:     dri-devel <dri-devel@lists.freedesktop.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Sven Schneider <s.schneider@arkona-technologies.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Sun, Oct 18, 2020 at 10:18 PM Peilin Ye <yepeilin.cs@gmail.com> wrote:
>
> On Sun, Oct 18, 2020 at 10:09:06PM +0200, Daniel Vetter wrote:
> > Adding dri-devel too, not sure anyone is still listening on linux-fbdev.
>
> I see, thanks!
>
> > On Sun, Oct 18, 2020 at 8:13 PM Peilin Ye <yepeilin.cs@gmail.com> wrote:
> > >
> > > Recently, in commit 6735b4632def ("Fonts: Support FONT_EXTRA_WORDS macros
> > > for built-in fonts"), we wrapped each of our built-in data buffers in a
> > > `font_data` structure, in order to use the following macros on them, see
> > > include/linux/font.h:
> > >
> > >         #define REFCOUNT(fd)    (((int *)(fd))[-1])
> > >         #define FNTSIZE(fd)     (((int *)(fd))[-2])
> > >         #define FNTCHARCNT(fd)  (((int *)(fd))[-3])
> > >         #define FNTSUM(fd)      (((int *)(fd))[-4])
> > >
> > >         #define FONT_EXTRA_WORDS 4
> > >
> > > Do the same thing to our new 6x8 font. For built-in fonts, currently we
> > > only use FNTSIZE(). Since this is only a temporary solution for an
> > > out-of-bounds issue in the framebuffer layer (see commit 5af08640795b
> > > ("fbcon: Fix global-out-of-bounds read in fbcon_get_font()")), all the
> > > three other fields are intentionally set to zero in order to discourage
> > > using these negative-indexing macros.
> > >
> > > Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
> >
> > Patch looks good to me, but it says 1/2 and I can't find 2/2 anywhere,
> > not even on lore. Did that get lost?
>
> 2/2 is just updating the fb documentation:
>
> [PATCH 2/2] docs: fb: Add font_6x8 to available built-in fonts
> https://lore.kernel.org/lkml/717bb41dda8e2ed615f3faadfbc3e215de726d38.1603037079.git.yepeilin.cs@gmail.com/
>
> I did `git format-patch -2 --thread=deep`, did I do something wrong when
> sending it?

No idea, it just didn't arrive anywhere I could find. And I did get
your previous patch series. Maybe just try again with dri-devel
included and hope it works then?
-Daniel

>


--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch