[SRU F/OEM-5.14/J/OEM-5.17 PATCH 0/3] CVE-2021-33655

Stefan Bader stefan.bader at canonical.com
Fri Aug 5 12:15:47 UTC 2022


On 05.08.22 12:09, Cengiz Can wrote:
> [Impact]
> When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,
> kernel will write memory out of bounds.
> 
> [Fix]
> Fixes were cherry-picked from closest stable trees and upstream.
> 
> MITRE entry points to a merge commit that contain six patches. Three of
> those were considered relevant.
> 
> [Test case]
> Compile and boot tested on KVM only.
> 
> [Potential regression]
> Due to self contained changes on >5.4, seems minimal.
> 
> Helge Deller (3):
>    fbcon: Disallow setting font bigger than screen size
>    fbcon: Prevent that screen size is smaller than font size
>    fbmem: Check virtual screen sizes in fb_set_var()
> 
>   drivers/video/fbdev/core/fbcon.c | 33 ++++++++++++++++++++++++++++++++
>   drivers/video/fbdev/core/fbmem.c | 14 +++++++++++++-
>   include/linux/fbcon.h            |  4 ++++
>   3 files changed, 50 insertions(+), 1 deletion(-)
> 

I wonder whether you should, instead of submitting for jammy:linux-oem-5.17 do 
submissions for jammy:linux-hwe-5.17 instead...

-Stefan
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