Bug#935192: grub2: Does not use settings from proxyDHCP during PXE

[Matthew Howle]

Source: grub2
Severity: normal

Dear Maintainer,

I am attempting to PXE boot an EFI computer with Secure Boot on. I am using
dnsmasq as the proxyDHCP. The signed shim and grubnetx64 launch, but the GRUB
shell is loads. The net_default_server is empty.

I am able to boot when I set net_default_server or use (tftp, IP)  with
"linux (tftp,ip)/vmlinuz \\ initrd (tftp,ip)/initrd".

I am using grubnetx64.efi.signed (grubx64.efi) and shimx64.efi.signed
(bootx64.efi) from buster.  I am using dnsmasq from stretch/oldstable.

dnsmasq: 2.76-5+deb9u2
grub-efi-amd64-signed: 1+2.02+dfsg1+20 99
shim-signed: 1.33+15+1533136590.3beb971-7

# cat /etc/dnsmasq.conf
port=0
log-dhcp
interface=eth0
bind-interfaces
dhcp-range=10.0.0.1,proxy,255.255.255.0
dhcp-no-override
dhcp-boot=bootx64.efi,,10.0.0.10

pxe-prompt="Press F8",5
pxe-service=x86PC,"Legacy",pxelinux.0,10.0.0.10
pxe-service=X86-64_EFI,"EFI",bootx64.efi,10.0.0.10
pxe-service=BC_EFI,"BC",bootx64.efi,10.0.0.10

enable-tftp
tftp-root=/srv/tftp

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