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[efi] Support versions of shim that perform SBAT verification

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The UEFI shim implements a fairly nicely designed revocation mechanism
designed around the concept of security generations.  Unfortunately
nobody in the shim community has thus far added the relevant metadata
to the Linux kernel, with the result that current versions of shim are
incapable of booting current versions of the Linux kernel.

Experience shows that there is unfortunately no point in trying to get
a fix for this upstreamed into shim.  We therefore default to working
around this undesirable behaviour by patching data read from the
"SbatLevel" variable used to hold SBAT configuration.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-05-23 14:55:08 +01:00
parent d2e1601cf4
commit 5b43181436
5 changed files with 160 additions and 6 deletions
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5
src/usr/shimmgmt.c
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@@ -39,9 +39,11 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
* @v image Shim image, or NULL to clear shim
* @v require_loader Require use of a third party loader
* @v allow_pxe Allow use of PXE base code
* @v allow_sbat Allow SBAT variable access
* @ret rc Return status code
*/
int shim ( struct image *image, int require_loader, int allow_pxe ) {
int shim ( struct image *image, int require_loader, int allow_pxe,
int allow_sbat ) {
/* Record (or clear) shim image */
image_tag ( image, &efi_shim );
@@ -53,6 +55,7 @@ int shim ( struct image *image, int require_loader, int allow_pxe ) {
/* Record configuration */
efi_shim_require_loader = require_loader;
efi_shim_allow_pxe = allow_pxe;
efi_shim_allow_sbat = allow_sbat;
return 0;
}