1 files changed, 25 insertions, 0 deletions
diff --git a/nixpkgs/nixos/tests/systemd-boot-ovmf-broken-fat-driver.patch b/nixpkgs/nixos/tests/systemd-boot-ovmf-broken-fat-driver.patch
new file mode 100644
index 000000000000..ef547c02f918
--- /dev/null
+++ b/nixpkgs/nixos/tests/systemd-boot-ovmf-broken-fat-driver.patch
@@ -0,0 +1,25 @@
+From d87a7513c6f2f2824203032ef27caeb84892ed7e Mon Sep 17 00:00:00 2001
+From: Will Fancher <elvishjerricco@gmail.com>
+Date: Tue, 30 May 2023 16:53:20 -0400
+Subject: [PATCH] Intentionally break the fat driver
+
+---
+ FatPkg/EnhancedFatDxe/ReadWrite.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/FatPkg/EnhancedFatDxe/ReadWrite.c b/FatPkg/EnhancedFatDxe/ReadWrite.c
+index 8f525044d1f1..32c62ff7817b 100644
+--- a/FatPkg/EnhancedFatDxe/ReadWrite.c
++++ b/FatPkg/EnhancedFatDxe/ReadWrite.c
+@@ -216,6 +216,11 @@ FatIFileAccess (
+   Volume = OFile->Volume;
+   Task   = NULL;
+ 
++  if (*BufferSize > (10U * 1024U * 1024U)) {
++    IFile->Position += 10U * 1024U * 1024U;
++    return EFI_BAD_BUFFER_SIZE;
++  }
++
+   //
+   // Write to a directory is unsupported
+   //