linux-kernel - Re: [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c

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Message-ID: <YGbcXMfP5pbCkG/9@equinox>
Date:   Fri, 2 Apr 2021 09:57:00 +0100
From:   Phillip Potter <phil@...lpotter.co.uk>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c

On Thu, Apr 01, 2021 at 11:55:50AM +0200, Geert Uytterhoeven wrote:
> On Thu, Apr 1, 2021 at 12:09 AM Phillip Potter <phil@...lpotter.co.uk> wrote:
> > Use kzalloc() rather than kmalloc() for the dynamically allocated parts
> > of the colormap in fb_alloc_cmap_gfp, to prevent a leak of random kernel
> > data to userspace under certain circumstances.
> >
> > Fixes a KMSAN-found infoleak bug reported by syzbot at:
> > https://syzkaller.appspot.com/bug?id=741578659feabd108ad9e06696f0c1f2e69c4b6e
> >
> > Reported-by: syzbot+47fa9c9c648b765305b9@...kaller.appspotmail.com
> > Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

Dear Geert

Thank you for your review :-)

Regards,
Phil