Bug 1811561

Lukas, can you share what version did you use for RHEL-8, please? 
I'm not able to reproduce it with latest RHEL-8.2  RHEL-8.2.0-20200310.0 (grub 2.02-81.el8) x86_64

Javier (in CC) can provide the list of patches that have to be ported
there, he would say all of them even if the issues can't be reproduced due
the bugs being masked by other patches.

(In reply to Petr Janda from comment #2)
> Lukas, can you share what version did you use for RHEL-8, please? 
> I'm not able to reproduce it with latest RHEL-8.2  RHEL-8.2.0-20200310.0
> (grub 2.02-81.el8) x86_64

I was able to reproduce the issue using that exact grub2 package version. The directory layout in my HTTP server is:

$ tree /var/www/html/netboot/
/var/www/html/netboot/
├── foo
│   └── bar.cfg
├── grub.cfg
├── grubx64.efi
└── shimx64.efi

And the filename in my dhcpd.conf is set to http://192.168.122.1/netboot/shimx64.efi.

On boot shim, grub2 and the grub.cfg in http://192.168.122.1/netboot/ are correctly fetched. I see the following in the HTTP server access log:

192.168.122.205 - - [08/Apr/2020:13:24:44 +0200] "HEAD /netboot/shimx64.efi HTTP/1.1" 200 - "-" "UefiHttpBoot/1.0"
192.168.122.205 - - [08/Apr/2020:13:24:44 +0200] "GET /netboot/shimx64.efi HTTP/1.1" 200 1317524 "-" "UefiHttpBoot/1.0"
192.168.122.205 - - [08/Apr/2020:13:24:44 +0200] "GET /netboot//grubx64.efi HTTP/1.1" 200 1877432 "-" "UefiHttpBoot/1.0"
192.168.122.205 - - [08/Apr/2020:13:24:44 +0200] "HEAD /netboot/grub.cfg HTTP/1.1" 200 - "-" "UefiHttpBoot/1.0"
192.168.122.205 - - [08/Apr/2020:13:24:44 +0200] "GET /netboot/grub.cfg HTTP/1.1" 200 518 "-" "UefiHttpBoot/1.0"
192.168.122.205 - - [08/Apr/2020:13:24:44 +0200] "HEAD /netboot/grub.cfg HTTP/1.1" 200 - "-" "UefiHttpBoot/1.0"
192.168.122.205 - - [08/Apr/2020:13:24:44 +0200] "GET /netboot/grub.cfg HTTP/1.1" 200 518 "-" "UefiHttpBoot/1.0"


Then I enter into the grub2 prompt and fetch the bar.cfg in http://192.168.122.1/netboot/foo/ using both an absolute and relative path:

grub> configfile /netboot/foo/bar.cfg

This works, the config file is fetched and I see the HTTP request and response in the access log:

192.168.122.108 - - [08/Apr/2020:13:26:50 +0200] "HEAD /netboot/foo/bar.cfg HTTP/1.1" 200 - "-" "UefiHttpBoot/1.0"
192.168.122.108 - - [08/Apr/2020:13:26:50 +0200] "GET /netboot/foo/bar.cfg HTTP/1.1" 200 500 "-" "UefiHttpBoot/1.0"

But using a relative path fails:

grub> configfile foo/bar.cfg

error: ../../grub-core/net/efi/http.c:234:Fail to send a request! status=0x12

And I don't see any logs in the access log. So the EFI firmware never makes the request. After that, any HTTP request fails even when using absolute paths (although this may be an issue only present in the OVMF EFI firmware):

grub> configfile /netboot/foo/bar.cfg

error: ../../grub-core/net/efi/http.c:234:Fail to send a request! status=0xf



After testing a RHEL8 build with the fix for Bug #1616395 it works correctly with both relative and absolute paths:

grub> configfile foo/bar.cfg

192.168.122.101 - - [08/Apr/2020:13:34:13 +0200] "HEAD /netboot/foo/bar.cfg HTTP/1.1" 200 - "-" "UefiHttpBoot/1.0"
192.168.122.101 - - [08/Apr/2020:13:34:13 +0200] "GET /netboot/foo/bar.cfg HTTP/1.1" 200 500 "-" "UefiHttpBoot/1.0"

grub> configfile /netboot/foo/bar.cfg

192.168.122.101 - - [08/Apr/2020:13:34:36 +0200] "HEAD /netboot/foo/bar.cfg HTTP/1.1" 200 - "-" "UefiHttpBoot/1.0"
192.168.122.101 - - [08/Apr/2020:13:34:36 +0200] "GET /netboot/foo/bar.cfg HTTP/1.1" 200 500 "-" "UefiHttpBoot/1.0"

providing qa_ack based on comment 4

*** Bug 1653645 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (grub2 bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4513