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From: Greg KH <gregkh@linuxfoundation.org>
To: Chen Jun <chenjun102@huawei.com>
Cc: stable@vger.kernel.org, deller@gmx.de, geert@linux-m68k.org,
	b.zolnierkie@samsung.com, xuqiang36@huawei.com
Subject: Re: [PATCH stable 4.14 v2 2/3] fbcon: Prevent that screen size is smaller than font size
Date: Thu, 4 Aug 2022 13:50:17 +0200	[thread overview]
Message-ID: <YuuyebRA0slDJVwx@kroah.com> (raw)
In-Reply-To: <20220804111539.96424-3-chenjun102@huawei.com>

On Thu, Aug 04, 2022 at 11:15:38AM +0000, Chen Jun wrote:
> From: Helge Deller <deller@gmx.de>
> 
> commit e64242caef18b4a5840b0e7a9bff37abd4f4f933 upstream
> 
> We need to prevent that users configure a screen size which is smaller than the
> currently selected font size. Otherwise rendering chars on the screen will
> access memory outside the graphics memory region.
> 
> This patch adds a new function fbcon_modechange_possible() which
> implements this check and which later may be extended with other checks
> if necessary.  The new function is called from the FBIOPUT_VSCREENINFO
> ioctl handler in fbmem.c, which will return -EINVAL if userspace asked
> for a too small screen size.
> 
> Signed-off-by: Helge Deller <deller@gmx.de>
> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Link: https://lore.kernel.org/all/20220706150253.2186-1-deller@gmx.de/
> [sudip: adjust context]

Who is "sudip" here?

And the Link: line wasn't in the original commit, where did that come
from?

thanks,

greg k-h

  reply	other threads:[~2022-08-04 11:50 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-04 11:15 [PATCH stable 4.14 v2 0/3] add fix patches for CVE-2021-33655 Chen Jun
2022-08-04 11:15 ` [PATCH stable 4.14 v2 1/3] printk: Export is_console_locked Chen Jun
2022-08-04 11:15 ` [PATCH stable 4.14 v2 2/3] fbcon: Prevent that screen size is smaller than font size Chen Jun
2022-08-04 11:50   ` Greg KH [this message]
2022-08-04 12:01     ` chenjun (AM)
2022-08-04 12:09       ` Greg KH
2022-08-04 12:21         ` chenjun (AM)
2022-08-04 11:15 ` [PATCH stable 4.14 v2 3/3] fbmem: Check virtual screen sizes in fb_set_var() Chen Jun

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