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loader: verity-hash.h fixups

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o Add some comments.
o Change image buffer type to (const void *).
o Add new macro VERITY_CMDLINE_LENGTH.

Signed-off-by: Geoff Levand <geoff@infradead.org>
This commit is contained in:
Geoff Levand 2017-01-25 14:54:46 -08:00
parent 57fca7d1a3
commit c9bd29e124
1 changed files with 17 additions and 4 deletions
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21
include/grub/verity-hash.h
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@ -1,13 +1,26 @@
/* CoreOS verity hash */
#define VERITY_ARG " verity.usrhash="
#define VERITY_ARG_LENGTH (sizeof (VERITY_ARG) - 1)
#define VERITY_HASH_OFFSET 0x40
#define VERITY_HASH_LENGTH 64
#define VERITY_CMDLINE_LENGTH ((VERITY_ARG_LENGTH)+(VERITY_HASH_LENGTH))
#define VERITY_HASH_OFFSET 0x40
static inline void grub_pass_verity_hash(struct linux_kernel_header *lh,
/**
* grub_pass_verity_hash - Reads the CoreOS verity hash value from a well known
* kernel image offset and adds a kernel command line argument for it.
*
* @pImage: Kernel image buffer.
* @cmdline: Kernel command line buffer.
* @cmdline_max_len: Kernel command line buffer length.
*/
static inline void grub_pass_verity_hash(const void *pImage,
char *cmdline,
grub_size_t cmdline_max_len)
{
char *buf = (char *)lh;
const char *buf = pImage;
grub_size_t cmdline_len;
int i;
@ -19,7 +32,7 @@ static inline void grub_pass_verity_hash(struct linux_kernel_header *lh,
}
cmdline_len = grub_strlen(cmdline);
if (cmdline_len + VERITY_ARG_LENGTH + VERITY_HASH_LENGTH > cmdline_max_len)
if (cmdline_len + VERITY_CMDLINE_LENGTH > cmdline_max_len)
return;
grub_memcpy (cmdline + cmdline_len, VERITY_ARG, VERITY_ARG_LENGTH);