Re: [PATCH] - make sure that EFI variable data size is always 64 bit

From: Matt Domsch
Date: Sun Mar 19 2006 - 17:47:14 EST

On Sun, Mar 19, 2006 at 09:33:01PM +0000, Matthew Garrett wrote:
> On Sun, Mar 19, 2006 at 03:29:01PM -0600, Matt Domsch wrote:
> > NAK. efibootmgr, the main userspace consumer of this struct, also
> > thinks this is an "unsigned long".
> Hm. My copy of efibootmgr has:
> typedef struct _efi_variable_t {
> efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
> efi_guid_t VendorGuid;
> uint64_t DataSize;
> uint8_t Data[1024];
> efi_status_t Status;
> uint32_t Attributes;
> } __attribute__((packed)) efi_variable_t;
> which certainly makes it look like it's expecting a 64-bit value. But
> checking the spec does seem to suggest that datasize is a native value,
> so presumably it's an efibootmgr bug rather than a kernel one? In that
> case, this ought to be dropped.

Sorry, I did mean to post a link to the latest efibootmgr that has
this fixed:

Home page:

For distros that care about 32-bit EFI, please upgrade to efibootmgr 0.5.3.


Matt Domsch
Software Architect
Dell Linux Solutions &
Linux on Dell mailing lists @
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at