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List: xen-cvs
Subject: [xen master] efifb: ignore frame buffer with invalid configuration
From: patchbot () xen ! org
Date: 2022-11-23 20:11:52
Message-ID: E1oxw64-00086p-VR () xenbits ! xenproject ! org
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commit 57f07cca82521088cca0c1fc36d6ffd06cb7de80
Author: Roger Pau Monné <roger.pau@citrix.com>
AuthorDate: Mon Nov 21 12:21:51 2022 +0100
Commit: Jan Beulich <jbeulich@suse.com>
CommitDate: Mon Nov 21 12:21:51 2022 +0100
efifb: ignore frame buffer with invalid configuration
On one of my boxes when the HDMI cable is not plugged in the
FrameBufferBase of the EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE structure is
set to 0 by the firmware (while some of the other fields looking
plausible).
Such (bogus address) ends up mapped in vesa_init(), and since it
overlaps with a RAM region the whole system goes down pretty badly,
see:
(XEN) vesafb: framebuffer at 0x0000000000000000, mapped to 0xffff82c000201000, \
using 35209k, total 35209k (XEN) vesafb: mode is 0x37557x32, linelength=960, font \
8x16 (XEN) vesafb: Truecolor: size=8:8:8:8, shift=24:0:8:16
(XEN) (XEN) (XEN) (XEN) (XEN) (XEN) (XEN) (XEN) �ERROR: Class:0; Subclass:0; \
Operation: 0 ERROR: No ConOut
ERROR: No ConIn
Do like Linux and prevent using the EFI Frame Buffer if the base
address is 0. This is inline with the logic in Linuxes
fb_base_is_valid() function at drivers/video/fbdev/efifb.c v6.0.9.
See also Linux commit 133bb070e94ab41d750c6f2160c8843e46f11b78 for
further reference.
Also prevent using Frame Buffers that have a 0 height or width, as
those are also invalid.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Henry Wang <Henry.Wang@arm.com>
---
xen/arch/x86/efi/efi-boot.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h
index e82ac9daa7..27f928ed3c 100644
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -506,6 +506,13 @@ static void __init \
efi_arch_video_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop, #ifdef CONFIG_VIDEO
int bpp = 0;
+ if ( !gop->Mode->FrameBufferBase || !mode_info->HorizontalResolution ||
+ !mode_info->VerticalResolution )
+ {
+ PrintErr(L"Invalid Frame Buffer configuration found\r\n");
+ return;
+ }
+
switch ( mode_info->PixelFormat )
{
case PixelRedGreenBlueReserved8BitPerColor:
--
generated by git-patchbot for /home/xen/git/xen.git#master
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