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authorRichard Weinberger <richard@nod.at>2013-04-17 01:00:53 +0200
committerMatt Fleming <matt.fleming@intel.com>2013-04-17 15:13:38 +0100
commit8c58bf3eec3b8fc8162fe557e9361891c20758f2 (patch)
treec88b22186b51a1fe78d4d6ffcbea058e27063e21 /arch
parent3668011d4ad556224f7c012c1e870a6eaa0e59da (diff)
downloadlinux-8c58bf3eec3b8fc8162fe557e9361891c20758f2.tar.gz
x86,efi: Implement efi_no_storage_paranoia parameter
Using this parameter one can disable the storage_size/2 check if he is really sure that the UEFI does sane gc and fulfills the spec. This parameter is useful if a devices uses more than 50% of the storage by default. The Intel DQSW67 desktop board is such a sucker for exmaple. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/platform/efi/efi.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 4f364c7c611..e4a86a677ce 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -113,6 +113,15 @@ static int __init setup_add_efi_memmap(char *arg)
}
early_param("add_efi_memmap", setup_add_efi_memmap);
+static bool efi_no_storage_paranoia;
+
+static int __init setup_storage_paranoia(char *arg)
+{
+ efi_no_storage_paranoia = true;
+ return 0;
+}
+early_param("efi_no_storage_paranoia", setup_storage_paranoia);
+
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
@@ -1137,7 +1146,10 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
*/
if (!storage_size || size > remaining_size ||
- (max_size && size > max_size) ||
+ (max_size && size > max_size))
+ return EFI_OUT_OF_RESOURCES;
+
+ if (!efi_no_storage_paranoia &&
((active_size + size + VAR_METADATA_SIZE > storage_size / 2) &&
(remaining_size - size < storage_size / 2)))
return EFI_OUT_OF_RESOURCES;