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* [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c
@ 2021-03-31 22:07 Phillip Potter
  2021-04-01  9:55 ` Geert Uytterhoeven
  2021-04-02 15:37 ` Greg KH
  0 siblings, 2 replies; 4+ messages in thread
From: Phillip Potter @ 2021-03-31 22:07 UTC (permalink / raw)
  To: mchehab+huawei; +Cc: daniel.vetter, dri-devel, linux-fbdev, linux-kernel

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@syzkaller.appspotmail.com
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
---
 drivers/video/fbdev/core/fbcmap.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/video/fbdev/core/fbcmap.c b/drivers/video/fbdev/core/fbcmap.c
index 757d5c3f620b..ff09e57f3c38 100644
--- a/drivers/video/fbdev/core/fbcmap.c
+++ b/drivers/video/fbdev/core/fbcmap.c
@@ -101,17 +101,17 @@ int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags)
 		if (!len)
 			return 0;
 
-		cmap->red = kmalloc(size, flags);
+		cmap->red = kzalloc(size, flags);
 		if (!cmap->red)
 			goto fail;
-		cmap->green = kmalloc(size, flags);
+		cmap->green = kzalloc(size, flags);
 		if (!cmap->green)
 			goto fail;
-		cmap->blue = kmalloc(size, flags);
+		cmap->blue = kzalloc(size, flags);
 		if (!cmap->blue)
 			goto fail;
 		if (transp) {
-			cmap->transp = kmalloc(size, flags);
+			cmap->transp = kzalloc(size, flags);
 			if (!cmap->transp)
 				goto fail;
 		} else {
-- 
2.30.2


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c
  2021-03-31 22:07 [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c Phillip Potter
@ 2021-04-01  9:55 ` Geert Uytterhoeven
  2021-04-02  8:57   ` Phillip Potter
  2021-04-02 15:37 ` Greg KH
  1 sibling, 1 reply; 4+ messages in thread
From: Geert Uytterhoeven @ 2021-04-01  9:55 UTC (permalink / raw)
  To: Phillip Potter
  Cc: Mauro Carvalho Chehab, Daniel Vetter, DRI Development,
	Linux Fbdev development list, Linux Kernel Mailing List

On Thu, Apr 1, 2021 at 12:09 AM Phillip Potter <phil@philpotter.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@syzkaller.appspotmail.com
> Signed-off-by: Phillip Potter <phil@philpotter.co.uk>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c
  2021-04-01  9:55 ` Geert Uytterhoeven
@ 2021-04-02  8:57   ` Phillip Potter
  0 siblings, 0 replies; 4+ messages in thread
From: Phillip Potter @ 2021-04-02  8:57 UTC (permalink / raw)
  To: Geert Uytterhoeven
  Cc: Mauro Carvalho Chehab, Daniel Vetter, DRI Development,
	Linux Fbdev development list, Linux Kernel Mailing List

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@philpotter.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@syzkaller.appspotmail.com
> > Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c
  2021-03-31 22:07 [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c Phillip Potter
  2021-04-01  9:55 ` Geert Uytterhoeven
@ 2021-04-02 15:37 ` Greg KH
  1 sibling, 0 replies; 4+ messages in thread
From: Greg KH @ 2021-04-02 15:37 UTC (permalink / raw)
  To: Phillip Potter
  Cc: mchehab+huawei, daniel.vetter, dri-devel, linux-fbdev, linux-kernel

On Wed, Mar 31, 2021 at 11:07:19PM +0100, Phillip Potter 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@syzkaller.appspotmail.com
> Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
> ---
>  drivers/video/fbdev/core/fbcmap.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Daniel, want me to take this?

thanks,

greg k-h

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-04-02 15:37 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2021-03-31 22:07 [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c Phillip Potter
2021-04-01  9:55 ` Geert Uytterhoeven
2021-04-02  8:57   ` Phillip Potter
2021-04-02 15:37 ` Greg KH

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