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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <sys/ucode.h>
#ifdef _KERNEL
#include <sys/systm.h>
#else
#include <strings.h>
#endif
/*
* Refer to
* Intel 64 and IA-32 Architectures Software Developers's Manual
* Chapter 9.11 Microcode Update Facilities
* for details.
*/
/*
* Validates the microcode header.
* Returns EM_OK on success, EM_HEADER on failure.
*/
ucode_errno_t
ucode_header_validate_intel(ucode_header_intel_t *uhp)
{
uint32_t header_size, body_size, total_size;
if (uhp == NULL)
return (EM_HEADER);
/*
* The only header version number supported is 1.
*/
if (uhp->uh_header_ver != 0x1)
return (EM_HEADER);
header_size = UCODE_HEADER_SIZE_INTEL;
total_size = UCODE_TOTAL_SIZE_INTEL(uhp->uh_total_size);
body_size = UCODE_BODY_SIZE_INTEL(uhp->uh_body_size);
/*
* The body size field of the microcode code header specifies the size
* of the encrypted data section, its value must be a multiple of the
* size of DWORD. The total size field must be in multiples of 1K
* bytes.
*/
if ((body_size % sizeof (int)) ||
(total_size < (header_size + body_size)) ||
(total_size % UCODE_KB(1)))
return (EM_HEADER);
/*
* Sanity check to avoid reading bogus files
*/
if (total_size < UCODE_MIN_SIZE || total_size > UCODE_MAX_SIZE)
return (EM_HEADER);
/*
* If there is extended signature table, total_size is the sum of
* header_size
* body_size
* sizeof (struct ucode_ext_table)
* n * sizeof (struct ucode_ext_sig)
* where n is indicated by uet_count in struct ucode_ext_table.
*/
if (total_size > (header_size + body_size)) {
if ((total_size - body_size - header_size -
UCODE_EXT_TABLE_SIZE_INTEL) % UCODE_EXT_SIG_SIZE_INTEL) {
return (EM_HEADER);
}
}
return (EM_OK);
}
/*
* Returns checksum.
*/
uint32_t
ucode_checksum_intel(uint32_t sum, uint32_t size, uint8_t *code)
{
int i;
uint32_t *lcode = (uint32_t *)(intptr_t)code;
i = size >> 2;
while (i--)
sum += lcode[i];
return (sum);
}
ucode_errno_t
ucode_validate_amd(uint8_t *ucodep, int size)
{
/* LINTED: pointer alignment */
uint32_t *ptr = (uint32_t *)ucodep;
uint32_t count;
if (ucodep == NULL || size <= 0)
return (EM_INVALIDARG);
/* Magic Number: "AMD\0" */
size -= 4;
if (*ptr++ != 0x00414d44)
return (EM_FILEFORMAT);
/* equivalence table */
size -= 4;
if (*ptr++)
return (EM_FILEFORMAT);
size -= 4;
if (((count = *ptr++) > size) || (count % 16))
return (EM_FILEFORMAT);
/* LINTED: pointer alignment */
ptr = (uint32_t *)(((uint8_t *)ptr) + count);
size -= count;
while (size > 8) {
/* microcode patch */
size -= 4;
if (*ptr++ != 1)
return (EM_FILEFORMAT);
size -= 4;
if (((count = *ptr++) > size))
return (EM_FILEFORMAT);
/* LINTED: pointer alignment */
ptr = (uint32_t *)(((uint8_t *)ptr) + count);
size -= count;
}
if (size)
return (EM_FILEFORMAT);
return (EM_OK);
}
ucode_errno_t
ucode_validate_intel(uint8_t *ucodep, int size)
{
uint32_t header_size = UCODE_HEADER_SIZE_INTEL;
int remaining;
if (ucodep == NULL || size <= 0)
return (EM_INVALIDARG);
for (remaining = size; remaining > 0; ) {
uint32_t total_size, body_size, ext_size;
ucode_header_intel_t *uhp;
uint8_t *curbuf = &ucodep[size - remaining];
ucode_errno_t rc;
uhp = (ucode_header_intel_t *)(intptr_t)curbuf;
if ((rc = ucode_header_validate_intel(uhp)) != EM_OK)
return (rc);
total_size = UCODE_TOTAL_SIZE_INTEL(uhp->uh_total_size);
if (ucode_checksum_intel(0, total_size, curbuf))
return (EM_CHECKSUM);
body_size = UCODE_BODY_SIZE_INTEL(uhp->uh_body_size);
ext_size = total_size - (header_size + body_size);
if (ext_size > 0) {
uint32_t i;
if (ucode_checksum_intel(0, ext_size,
&curbuf[header_size + body_size])) {
return (EM_CHECKSUM);
}
ext_size -= UCODE_EXT_TABLE_SIZE_INTEL;
for (i = 0; i < ext_size / UCODE_EXT_SIG_SIZE_INTEL;
i++) {
if (ucode_checksum_intel(0,
UCODE_EXT_SIG_SIZE_INTEL,
&curbuf[total_size - ext_size +
i * UCODE_EXT_SIG_SIZE_INTEL])) {
return (EM_CHECKSUM);
}
}
}
remaining -= total_size;
}
return (EM_OK);
}
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