nixos/tests/systemd-boot-ovmf-broken-fat-driver.patch

   1 From d87a7513c6f2f2824203032ef27caeb84892ed7e Mon Sep 17 00:00:00 2001
   2 From: Will Fancher <elvishjerricco@gmail.com>
   3 Date: Tue, 30 May 2023 16:53:20 -0400
   4 Subject: [PATCH] Intentionally break the fat driver
   5
   6 ---
   7  FatPkg/EnhancedFatDxe/ReadWrite.c | 5 +++++
   8  1 file changed, 5 insertions(+)
   9
  10 diff --git a/FatPkg/EnhancedFatDxe/ReadWrite.c b/FatPkg/EnhancedFatDxe/ReadWrite.c
  11 index 8f525044d1f1..32c62ff7817b 100644
  12 --- a/FatPkg/EnhancedFatDxe/ReadWrite.c
  13 +++ b/FatPkg/EnhancedFatDxe/ReadWrite.c
  14 @@ -216,6 +216,11 @@ FatIFileAccess (
  15    Volume = OFile->Volume;
  16    Task   = NULL;
  17
  18 +  if (*BufferSize > (10U * 1024U * 1024U)) {
  19 +    IFile->Position += 10U * 1024U * 1024U;
  20 +    return EFI_BAD_BUFFER_SIZE;
  21 +  }
  22 +
  23    //
  24    // Write to a directory is unsupported
  25    //