drm/ast: Fixed CVE for DP501

Browse source

[Bug][DP501]
If ASPEED P2A (PCI to AHB) bridge is disabled and disallowed for
CVE_2019_6260 item3, and then the monitor's EDID is unable read through
Parade DP501.
The reason is the DP501's FW is mapped to BMC addressing space rather
than Host addressing space.
The resolution is that using "pci_iomap_range()" maps to DP501's FW that
stored on the end of FB (Frame Buffer).
In this case, FrameBuffer reserves the last 2MB used for the image of
DP501.

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210421085859.17761-1-kuohsiang_chou@aspeedtech.com

...

This commit is contained in:

KuoHsiang Chou 2021-04-21 16:58:59 +08:00 • committed by Thomas Zimmermann

parent 749da85a9a

commit ba4e0339a6

3 changed files with 125 additions and 37 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

131

drivers/gpu/drm/ast/ast_dp501.c

View file

12

drivers/gpu/drm/ast/ast_drv.h

View file

11

drivers/gpu/drm/ast/ast_main.c

View file