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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/types.h> 28 #include <sys/ucode.h> 29 #ifdef _KERNEL 30 #include <sys/systm.h> 31 #else 32 #include <strings.h> 33 #endif 34 35 /* 36 * Refer to 37 * Intel 64 and IA-32 Architectures Software Developers's Manual 38 * Chapter 9.11 Microcode Update Facilities 39 * for details. 40 */ 41 42 /* 43 * Validates the microcode header. 44 * Returns EM_OK on success, EM_HEADER on failure. 45 */ 46 ucode_errno_t 47 ucode_header_validate_intel(ucode_header_intel_t *uhp) 48 { 49 uint32_t header_size, body_size, total_size; 50 51 if (uhp == NULL) 52 return (EM_HEADER); 53 54 /* 55 * The only header version number supported is 1. 56 */ 57 if (uhp->uh_header_ver != 0x1) 58 return (EM_HEADER); 59 60 header_size = UCODE_HEADER_SIZE_INTEL; 61 total_size = UCODE_TOTAL_SIZE_INTEL(uhp->uh_total_size); 62 body_size = UCODE_BODY_SIZE_INTEL(uhp->uh_body_size); 63 64 /* 65 * The body size field of the microcode code header specifies the size 66 * of the encrypted data section, its value must be a multiple of the 67 * size of DWORD. The total size field must be in multiples of 1K 68 * bytes. 69 */ 70 if ((body_size % sizeof (int)) || 71 (total_size < (header_size + body_size)) || 72 (total_size % UCODE_KB(1))) 73 74 return (EM_HEADER); 75 76 /* 77 * Sanity check to avoid reading bogus files 78 */ 79 if (total_size < UCODE_MIN_SIZE || total_size > UCODE_MAX_SIZE) 80 return (EM_HEADER); 81 82 /* 83 * If there is extended signature table, total_size is the sum of 84 * header_size 85 * body_size 86 * sizeof (struct ucode_ext_table) 87 * n * sizeof (struct ucode_ext_sig) 88 * where n is indicated by uet_count in struct ucode_ext_table. 89 */ 90 if (total_size > (header_size + body_size)) { 91 if ((total_size - body_size - header_size - 92 UCODE_EXT_TABLE_SIZE_INTEL) % UCODE_EXT_SIG_SIZE_INTEL) { 93 94 return (EM_HEADER); 95 } 96 } 97 98 return (EM_OK); 99 } 100 101 /* 102 * Returns checksum. 103 */ 104 uint32_t 105 ucode_checksum_intel(uint32_t sum, uint32_t size, uint8_t *code) 106 { 107 int i; 108 uint32_t *lcode = (uint32_t *)(intptr_t)code; 109 110 i = size >> 2; 111 while (i--) 112 sum += lcode[i]; 113 114 return (sum); 115 } 116 117 ucode_errno_t 118 ucode_validate_amd(uint8_t *ucodep, int size) 119 { 120 /* LINTED: pointer alignment */ 121 uint32_t *ptr = (uint32_t *)ucodep; 122 uint32_t count; 123 124 if (ucodep == NULL || size <= 0) 125 return (EM_INVALIDARG); 126 127 /* Magic Number: "AMD\0" */ 128 size -= 4; 129 if (*ptr++ != 0x00414d44) 130 return (EM_FILEFORMAT); 131 132 /* equivalence table */ 133 size -= 4; 134 if (*ptr++) 135 return (EM_FILEFORMAT); 136 137 size -= 4; 138 if (((count = *ptr++) > size) || (count % 16)) 139 return (EM_FILEFORMAT); 140 141 /* LINTED: pointer alignment */ 142 ptr = (uint32_t *)(((uint8_t *)ptr) + count); 143 size -= count; 144 145 while (size > 8) { 146 /* microcode patch */ 147 size -= 4; 148 if (*ptr++ != 1) 149 return (EM_FILEFORMAT); 150 151 size -= 4; 152 if (((count = *ptr++) > size)) 153 return (EM_FILEFORMAT); 154 155 /* LINTED: pointer alignment */ 156 ptr = (uint32_t *)(((uint8_t *)ptr) + count); 157 size -= count; 158 } 159 160 if (size) 161 return (EM_FILEFORMAT); 162 163 return (EM_OK); 164 } 165 166 ucode_errno_t 167 ucode_validate_intel(uint8_t *ucodep, int size) 168 { 169 uint32_t header_size = UCODE_HEADER_SIZE_INTEL; 170 int remaining; 171 172 if (ucodep == NULL || size <= 0) 173 return (EM_INVALIDARG); 174 175 for (remaining = size; remaining > 0; ) { 176 uint32_t total_size, body_size, ext_size; 177 ucode_header_intel_t *uhp; 178 uint8_t *curbuf = &ucodep[size - remaining]; 179 ucode_errno_t rc; 180 181 uhp = (ucode_header_intel_t *)(intptr_t)curbuf; 182 183 if ((rc = ucode_header_validate_intel(uhp)) != EM_OK) 184 return (rc); 185 186 total_size = UCODE_TOTAL_SIZE_INTEL(uhp->uh_total_size); 187 188 if (ucode_checksum_intel(0, total_size, curbuf)) 189 return (EM_CHECKSUM); 190 191 body_size = UCODE_BODY_SIZE_INTEL(uhp->uh_body_size); 192 ext_size = total_size - (header_size + body_size); 193 194 if (ext_size > 0) { 195 uint32_t i; 196 197 if (ucode_checksum_intel(0, ext_size, 198 &curbuf[header_size + body_size])) { 199 return (EM_CHECKSUM); 200 } 201 202 ext_size -= UCODE_EXT_TABLE_SIZE_INTEL; 203 for (i = 0; i < ext_size / UCODE_EXT_SIG_SIZE_INTEL; 204 i++) { 205 if (ucode_checksum_intel(0, 206 UCODE_EXT_SIG_SIZE_INTEL, 207 &curbuf[total_size - ext_size + 208 i * UCODE_EXT_SIG_SIZE_INTEL])) { 209 210 return (EM_CHECKSUM); 211 } 212 } 213 } 214 215 remaining -= total_size; 216 } 217 return (EM_OK); 218 } 219