[SRU F/OEM-5.14/J/OEM-5.17 PATCH 0/3] CVE-2021-33655
cengiz.can at canonical.com
Fri Aug 5 10:09:40 UTC 2022
When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,
kernel will write memory out of bounds.
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.
Compile and boot tested on KVM only.
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(-)
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