[Bug 1813541] Re: Shim uses wrong TFTP server IP in proxyDHCP mode

[Steve Langasek]

The upstream bug is still unresolved, and shim is highly security
sensitive code.  So we need to wait for an agreed upstream fix.

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https://bugs.launchpad.net/bugs/1813541

Title:
  Shim uses wrong TFTP server IP in proxyDHCP mode

Status in shim:
  New
Status in shim package in Ubuntu:
  Triaged

Bug description:
  This works fine:
  UEFI > real DHCP > shimx64.efi over TFTP > grubx64.efi over TFTP.

  In the scenario above, if we change "real" with "proxy", it fails,
  because it's trying to download grubx64.efi from the real DHCP server
  instead of the proxy one.

  A proxy DHCP server is one that only sends the boot filename, and
  leaves the IP assignments to the real DHCP server. We use that a lot
  in the ltsp.org and in other netbooting projects, as it avoids the
  need for a special network setup.

  Sample dnsmasq.conf for proxy setup:

  enable-tftp
  tftp-root=/var/lib/tftpboot
  dhcp-range=10.161.254.0,proxy,255.255.255.0
  pxe-service=X86-64_EFI,"Boot from network",shimx64.efi

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