diff options
| author | Lenny Szubowicz <lszubowi@redhat.com> | 2020-09-04 21:31:05 -0400 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-09-16 18:53:42 +0300 |
| commit | 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 (patch) | |
| tree | cdc1e962338043c159fb964f09528526b6c767ec /arch/x86/platform | |
| parent | 5c4c30f40ca246f83b6663984dcdcbfeb0f8b66f (diff) | |
efi: Support for MOK variable config table
Because of system-specific EFI firmware limitations, EFI volatile
variables may not be capable of holding the required contents of
the Machine Owner Key (MOK) certificate store when the certificate
list grows above some size. Therefore, an EFI boot loader may pass
the MOK certs via a EFI configuration table created specifically for
this purpose to avoid this firmware limitation.
An EFI configuration table is a much more primitive mechanism
compared to EFI variables and is well suited for one-way passage
of static information from a pre-OS environment to the kernel.
This patch adds initial kernel support to recognize, parse,
and validate the EFI MOK configuration table, where named
entries contain the same data that would otherwise be provided
in similarly named EFI variables.
Additionally, this patch creates a sysfs binary file for each
EFI MOK configuration table entry found. These files are read-only
to root and are provided for use by user space utilities such as
mokutil.
A subsequent patch will load MOK certs into the trusted platform
key ring using this infrastructure.
Signed-off-by: Lenny Szubowicz <lszubowi@redhat.com>
Link: https://lore.kernel.org/r/20200905013107.10457-2-lszubowi@redhat.com
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'arch/x86/platform')
| -rw-r--r-- | arch/x86/platform/efi/efi.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index f6ea8f1a9d57..6961bedc6503 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -91,6 +91,9 @@ static const unsigned long * const efi_tables[] = { &efi.tpm_log, &efi.tpm_final_log, &efi_rng_seed, +#ifdef CONFIG_LOAD_UEFI_KEYS + &efi.mokvar_table, +#endif }; u64 efi_setup; /* efi setup_data physical address */ |