File shim-bsc1185621-relax-max-var-sz-check.patch of Package shim.19526

commit 690ec2419a8c2c4246450e447629adc85f9a6f40
Author: Gary Lin <glin@suse.com>
Date:   Wed May 5 11:25:07 2021 +0800

    mok: relax the maximum variable size check
    
    Some UEFI environment such as u-boot doesn't implement
    QueryVariableInfo(), so we couldn't rely on the function to estimate the
    available space for RT variables. All we can do is to call SetVariable()
    directly and check the return value of SetVariable().
    
    Signed-off-by: Gary Lin <glin@suse.com>

diff --git a/mok.c b/mok.c
index 5ad9072b..1f9820e7 100644
--- a/mok.c
+++ b/mok.c
@@ -351,13 +351,18 @@ mirror_mok_db(CHAR16 *name, CHAR8 *name8, EFI_GUID *guid, UINT32 attrs,
 	SIZE_T max_var_sz;
 
 	efi_status = get_max_var_sz(attrs, &max_var_sz);
-	if (EFI_ERROR(efi_status)) {
+	if (EFI_ERROR(efi_status) && efi_status != EFI_UNSUPPORTED) {
 		LogError(L"Could not get maximum variable size: %r",
 			 efi_status);
 		return efi_status;
 	}
 
-	if (FullDataSize <= max_var_sz) {
+	/* Some UEFI environment such as u-boot doesn't implement
+	 * QueryVariableInfo() and we will only get EFI_UNSUPPORTED when
+	 * querying the available space. In this case, we just mirror
+	 * the variable directly. */
+	if (FullDataSize <= max_var_sz || efi_status == EFI_UNSUPPORTED) {
+		efi_status = EFI_SUCCESS;
 		if (only_first)
 			efi_status = SetVariable(name, guid, attrs,
 						 FullDataSize, FullData);
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