[Bug 2037137] Re: shim crashes on arm64 w/ firmware that supports EFI Memory Attribute Protocol

[dann frazier]

** This bug is no longer a duplicate of bug 2036604
   Synchronous Exception when booting VMs via qemu-efi-aarch64

** Summary changed:

- shim crashes on arm64 w/ firmware that supports EFI Memory Attribute Protocol
+ Enable NX support for ARM VMs

** Also affects: edk2 (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  Enable NX support for ARM VMs

Status in EDK II:
  Unknown
Status in edk2 package in Ubuntu:
  New
Status in shim package in Ubuntu:
  New

Bug description:
  shim 15.7-0ubuntu1

  qemu-efi-aarch64 now implements EFI Memory Attribute Protocol. When
  shim detects this, it uses it to set memory attributes appropriately
  for the sections of the bootloader image it loads before passing
  control to it. After this change, fresh Ubuntu VMs began crashing on
  startup (bug 2036604):

    --------------------------------------
    BdsDxe: loading Boot0001 "UEFI Misc Device" from PciRoot(0x0)/Pci(0x1,0x3)/Pci(0x0,0x0)
    BdsDxe: starting Boot0001 "UEFI Misc Device" from PciRoot(0x0)/Pci(0x1,0x3)/Pci(0x0,0x0)

    Synchronous Exception at 0x00000000BC300000

    Synchronous Exception at 0x00000000BC300000

    --------------------------------------

   I narrowed this down to only happening when shim executes fbaa64.efi
  (thus the fresh VM). I found upstream shim is unaffected, so I used
  bisection to identify the relevant change:

    From c7b305152802c8db688605654f75e1195def9fd6 Mon Sep 17 00:00:00 2001
    From: Nicholas Bishop <REDACTED>
    Date: Mon, 19 Dec 2022 18:56:13 -0500
    Subject: [PATCH] pe: Align section size up to page size for mem attrs

    Setting memory attributes is generally done at page granularity, and
    this is enforced by checks in `get_mem_attrs` and
    `update_mem_attrs`. But unlike the section address, the section size
    isn't necessarily aligned to 4KiB. Round up the section size to fix
    this.

    Signed-off-by: Nicholas Bishop <nicholasbishop at google.com>

  Please add this patch to shim.

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