1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/ucode.h> 31 #ifdef _KERNEL 32 #include <sys/systm.h> 33 #else 34 #include <strings.h> 35 #endif 36 37 /* 38 * Refer to 39 * Intel 64 and IA-32 Architectures Software Developers's Manual 40 * Chapter 9.11 Microcode Update Facilities 41 * for details. 42 */ 43 44 /* 45 * Validates the microcode header. 46 * Returns EM_OK on success, EM_HEADER on failure. 47 */ 48 ucode_errno_t 49 ucode_header_validate(ucode_header_t *uhp) 50 { 51 uint32_t header_size, body_size, total_size; 52 53 if (uhp == NULL) 54 return (EM_HEADER); 55 56 /* 57 * The only header version number supported is 1. 58 */ 59 if (uhp->uh_header_ver != 0x1) 60 return (EM_HEADER); 61 62 header_size = UCODE_HEADER_SIZE; 63 total_size = UCODE_TOTAL_SIZE(uhp->uh_total_size); 64 body_size = UCODE_BODY_SIZE(uhp->uh_body_size); 65 66 /* 67 * The body size field of the microcode code header specifies the size 68 * of the encrypted data section, its value must be a multiple of the 69 * size of DWORD. The total size field must be in multiples of 1K 70 * bytes. 71 */ 72 if ((body_size % sizeof (int)) || 73 (total_size < (header_size + body_size)) || 74 (total_size % UCODE_KB(1))) 75 76 return (EM_HEADER); 77 78 /* 79 * Sanity check to avoid reading bogus files 80 */ 81 if (total_size < UCODE_MIN_SIZE || total_size > UCODE_MAX_SIZE) 82 return (EM_HEADER); 83 84 /* 85 * If there is extended signature table, total_size is the sum of 86 * header_size 87 * body_size 88 * sizeof (struct ucode_ext_table) 89 * n * sizeof (struct ucode_ext_sig) 90 * where n is indicated by uet_count in struct ucode_ext_table. 91 */ 92 if (total_size > (header_size + body_size)) { 93 if ((total_size - body_size - header_size - 94 UCODE_EXT_TABLE_SIZE) % UCODE_EXT_SIG_SIZE) { 95 96 return (EM_HEADER); 97 } 98 } 99 100 return (EM_OK); 101 } 102 103 /* 104 * Returns checksum. 105 */ 106 uint32_t 107 ucode_checksum(uint32_t sum, uint32_t size, uint8_t *code) 108 { 109 int i; 110 uint32_t *lcode = (uint32_t *)(intptr_t)code; 111 112 i = size >> 2; 113 while (i--) 114 sum += lcode[i]; 115 116 return (sum); 117 } 118 119 ucode_errno_t 120 ucode_validate(uint8_t *ucodep, int size) 121 { 122 uint32_t header_size = UCODE_HEADER_SIZE; 123 int remaining; 124 125 if (ucodep == NULL || size <= 0) 126 return (EM_INVALIDARG); 127 128 for (remaining = size; remaining > 0; ) { 129 uint32_t total_size, body_size, ext_size; 130 ucode_header_t *uhp; 131 uint8_t *curbuf = &ucodep[size - remaining]; 132 ucode_errno_t rc; 133 134 uhp = (ucode_header_t *)(intptr_t)curbuf; 135 136 if ((rc = ucode_header_validate(uhp)) != EM_OK) 137 return (rc); 138 139 total_size = UCODE_TOTAL_SIZE(uhp->uh_total_size); 140 141 if (ucode_checksum(0, total_size, curbuf)) 142 return (EM_CHECKSUM); 143 144 body_size = UCODE_BODY_SIZE(uhp->uh_body_size); 145 ext_size = total_size - (header_size + body_size); 146 147 if (ext_size > 0) { 148 uint32_t i; 149 150 if (ucode_checksum(0, ext_size, 151 &curbuf[header_size + body_size])) { 152 return (EM_CHECKSUM); 153 } 154 155 ext_size -= UCODE_EXT_TABLE_SIZE; 156 for (i = 0; i < ext_size / UCODE_EXT_SIG_SIZE; i++) { 157 if (ucode_checksum(0, UCODE_EXT_SIG_SIZE, 158 &curbuf[total_size - ext_size + 159 i * UCODE_EXT_SIG_SIZE])) { 160 161 return (EM_CHECKSUM); 162 } 163 } 164 } 165 166 remaining -= total_size; 167 } 168 return (EM_OK); 169 } 170