linux-kernel - Re: [PATCH 6/9] efi: Add EFI signature data types

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Date:   Wed, 16 Nov 2016 15:43:48 -0800 (PST)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     David Howells <dhowells@...hat.com>
cc:     keyrings@...r.kernel.org, matthew.garrett@...ula.com,
        linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] efi: Add EFI signature data types


David,

On Wed, 16 Nov 2016, David Howells wrote:

> From: Dave Howells <dhowells@...hat.com>
>
> Add the data types that are used for containing hashes, keys and
> certificates for cryptographic verification along with their corresponding
> type GUIDs.
>
> Signed-off-by: David Howells <dhowells@...hat.com>
> ---
>
> include/linux/efi.h |   24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index acfdea8381de..6fb50bafedc7 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -594,6 +594,9 @@ void efi_native_runtime_setup(void);
>
> #define EFI_IMAGE_SECURITY_DATABASE_GUID	EFI_GUID(0xd719b2cb, 0x3d3a, 0x4596, 0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f)
> #define EFI_SHIM_LOCK_GUID			EFI_GUID(0x605dab50, 0xe046, 0x4300, 0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23)
> +#define EFI_CERT_SHA256_GUID			EFI_GUID(0xc1c41626, 0x504c, 0x4092, 0xac, 0xa9, 0x41, 0xf9, 0x36, 0x93, 0x43, 0x28 )
> +#define EFI_CERT_X509_GUID			EFI_GUID(0xa5c059a1, 0x94e4, 0x4aa7, 0x87, 0xb5, 0xab, 0x15, 0x5c, 0x2b, 0xf0, 0x72 )
> +#define EFI_CERT_X509_SHA256_GUID		EFI_GUID(0x3bd2a492, 0x96c0, 0x4079, 0xb4, 0x20, 0xfc, 0xf9, 0x8e, 0xf1, 0x03, 0xed );

The trailing ';' on EFI_CERT_X509_SHA256_GUID could trip someone up later. 
As long as you're fixing that, the spaces before the closing parens are 
inconsistent with the other GUID definitions in this file.

> /*
>  * This GUID is used to pass to the kernel proper the struct screen_info
> @@ -853,6 +856,27 @@ typedef struct {
> 	efi_memory_desc_t entry[0];
> } efi_memory_attributes_table_t;
>
> +typedef struct  {
> +	efi_guid_t signature_owner;
> +	u8 signature_data[];
> +} efi_signature_data_t;
> +
> +typedef struct {
> +	efi_guid_t signature_type;
> +	u32 signature_list_size;
> +	u32 signature_header_size;
> +	u32 signature_size;
> +	u8 signature_header[];
> +	/* efi_signature_data_t signatures[][] */
> +} efi_signature_list_t;
> +
> +typedef u8 efi_sha256_hash_t[32];
> +
> +typedef struct {
> +	efi_sha256_hash_t to_be_signed_hash;
> +	efi_time_t time_of_revocation;
> +} efi_cert_x509_sha256_t;
> +
> /*
>  * All runtime access to EFI goes through this structure:
>  */

--
Mat Martineau
Intel OTC