From ae87440578369456b55e54125e101d27c332bc5a Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Wed, 18 May 2016 00:54:47 +0200
Subject: efi_loader: Clean up system table on exit

We put the system table into our runtime services data section so that
payloads may still access it after exit_boot_services. However, most fields
in it are quite useless once we're in that state, so let's just patch them
out.

With this patch we don't get spurious warnings when running EFI binaries
anymore.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 3ee27ca..11d0126 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -125,6 +125,22 @@ static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
 		/* RTC accessors are gone */
 		.ptr = &efi_runtime_services.get_time,
 		.patchto = &efi_device_error,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.con_in,
+		.patchto = NULL,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.con_out,
+		.patchto = NULL,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.std_err,
+		.patchto = NULL,
+	}, {
+		/* Clean up system table */
+		.ptr = &systab.boottime,
+		.patchto = NULL,
 	},
 };
 
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