1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * misc.c 2 * misc.c
4 * 3 *
5 * PURPOSE 4 * PURPOSE
6 * Miscellaneous routines for the OSTA-UD 5 * Miscellaneous routines for the OSTA-UDF(tm) filesystem.
7 * 6 *
8 * COPYRIGHT 7 * COPYRIGHT
>> 8 * This file is distributed under the terms of the GNU General Public
>> 9 * License (GPL). Copies of the GPL can be obtained from:
>> 10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
>> 11 * Each contributing author retains all rights to their own work.
>> 12 *
9 * (C) 1998 Dave Boynton 13 * (C) 1998 Dave Boynton
10 * (C) 1998-2004 Ben Fennema 14 * (C) 1998-2004 Ben Fennema
11 * (C) 1999-2000 Stelias Computing Inc 15 * (C) 1999-2000 Stelias Computing Inc
12 * 16 *
13 * HISTORY 17 * HISTORY
14 * 18 *
15 * 04/19/99 blf partial support for reading/ 19 * 04/19/99 blf partial support for reading/writing specific EA's
16 */ 20 */
17 21
18 #include "udfdecl.h" 22 #include "udfdecl.h"
19 23
20 #include <linux/fs.h> 24 #include <linux/fs.h>
21 #include <linux/string.h> 25 #include <linux/string.h>
22 #include <linux/crc-itu-t.h> 26 #include <linux/crc-itu-t.h>
23 27
24 #include "udf_i.h" 28 #include "udf_i.h"
25 #include "udf_sb.h" 29 #include "udf_sb.h"
26 30
>> 31 struct buffer_head *udf_tgetblk(struct super_block *sb, udf_pblk_t block)
>> 32 {
>> 33 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
>> 34 return sb_getblk(sb, udf_fixed_to_variable(block));
>> 35 else
>> 36 return sb_getblk(sb, block);
>> 37 }
>> 38
>> 39 struct buffer_head *udf_tread(struct super_block *sb, udf_pblk_t block)
>> 40 {
>> 41 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
>> 42 return sb_bread(sb, udf_fixed_to_variable(block));
>> 43 else
>> 44 return sb_bread(sb, block);
>> 45 }
>> 46
27 struct genericFormat *udf_add_extendedattr(str 47 struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size,
28 uin 48 uint32_t type, uint8_t loc)
29 { 49 {
30 uint8_t *ea = NULL, *ad = NULL; 50 uint8_t *ea = NULL, *ad = NULL;
31 int offset; 51 int offset;
32 uint16_t crclen; 52 uint16_t crclen;
33 struct udf_inode_info *iinfo = UDF_I(i 53 struct udf_inode_info *iinfo = UDF_I(inode);
34 54
35 ea = iinfo->i_data; 55 ea = iinfo->i_data;
36 if (iinfo->i_lenEAttr) { 56 if (iinfo->i_lenEAttr) {
37 ad = iinfo->i_data + iinfo->i_ 57 ad = iinfo->i_data + iinfo->i_lenEAttr;
38 } else { 58 } else {
39 ad = ea; 59 ad = ea;
40 size += sizeof(struct extended 60 size += sizeof(struct extendedAttrHeaderDesc);
41 } 61 }
42 62
43 offset = inode->i_sb->s_blocksize - ud 63 offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) -
44 iinfo->i_lenAlloc; 64 iinfo->i_lenAlloc;
45 65
46 /* TODO - Check for FreeEASpace */ 66 /* TODO - Check for FreeEASpace */
47 67
48 if (loc & 0x01 && offset >= size) { 68 if (loc & 0x01 && offset >= size) {
49 struct extendedAttrHeaderDesc 69 struct extendedAttrHeaderDesc *eahd;
50 eahd = (struct extendedAttrHea 70 eahd = (struct extendedAttrHeaderDesc *)ea;
51 71
52 if (iinfo->i_lenAlloc) 72 if (iinfo->i_lenAlloc)
53 memmove(&ad[size], ad, 73 memmove(&ad[size], ad, iinfo->i_lenAlloc);
54 74
55 if (iinfo->i_lenEAttr) { 75 if (iinfo->i_lenEAttr) {
56 /* check checksum/crc 76 /* check checksum/crc */
57 if (eahd->descTag.tagI 77 if (eahd->descTag.tagIdent !=
58 cpu_to 78 cpu_to_le16(TAG_IDENT_EAHD) ||
59 le32_to_cpu(eahd-> 79 le32_to_cpu(eahd->descTag.tagLocation) !=
60 iinfo- 80 iinfo->i_location.logicalBlockNum)
61 return NULL; 81 return NULL;
62 } else { 82 } else {
63 struct udf_sb_info *sb 83 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
64 84
65 size -= sizeof(struct 85 size -= sizeof(struct extendedAttrHeaderDesc);
66 iinfo->i_lenEAttr += 86 iinfo->i_lenEAttr +=
67 sizeof(struct 87 sizeof(struct extendedAttrHeaderDesc);
68 eahd->descTag.tagIdent 88 eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD);
69 if (sbi->s_udfrev >= 0 89 if (sbi->s_udfrev >= 0x0200)
70 eahd->descTag. 90 eahd->descTag.descVersion = cpu_to_le16(3);
71 else 91 else
72 eahd->descTag. 92 eahd->descTag.descVersion = cpu_to_le16(2);
73 eahd->descTag.tagSeria 93 eahd->descTag.tagSerialNum =
74 cpu_to 94 cpu_to_le16(sbi->s_serial_number);
75 eahd->descTag.tagLocat 95 eahd->descTag.tagLocation = cpu_to_le32(
76 iinfo- 96 iinfo->i_location.logicalBlockNum);
77 eahd->impAttrLocation 97 eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF);
78 eahd->appAttrLocation 98 eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF);
79 } 99 }
80 100
81 offset = iinfo->i_lenEAttr; 101 offset = iinfo->i_lenEAttr;
82 if (type < 2048) { 102 if (type < 2048) {
83 if (le32_to_cpu(eahd-> 103 if (le32_to_cpu(eahd->appAttrLocation) <
84 iinfo- 104 iinfo->i_lenEAttr) {
85 uint32_t aal = 105 uint32_t aal =
86 le32_t 106 le32_to_cpu(eahd->appAttrLocation);
87 memmove(&ea[of 107 memmove(&ea[offset - aal + size],
88 &ea[aa 108 &ea[aal], offset - aal);
89 offset -= aal; 109 offset -= aal;
90 eahd->appAttrL 110 eahd->appAttrLocation =
91 111 cpu_to_le32(aal + size);
92 } 112 }
93 if (le32_to_cpu(eahd-> 113 if (le32_to_cpu(eahd->impAttrLocation) <
94 iinfo- 114 iinfo->i_lenEAttr) {
95 uint32_t ial = 115 uint32_t ial =
96 le32_t 116 le32_to_cpu(eahd->impAttrLocation);
97 memmove(&ea[of 117 memmove(&ea[offset - ial + size],
98 &ea[ia 118 &ea[ial], offset - ial);
99 offset -= ial; 119 offset -= ial;
100 eahd->impAttrL 120 eahd->impAttrLocation =
101 121 cpu_to_le32(ial + size);
102 } 122 }
103 } else if (type < 65536) { 123 } else if (type < 65536) {
104 if (le32_to_cpu(eahd-> 124 if (le32_to_cpu(eahd->appAttrLocation) <
105 iinfo- 125 iinfo->i_lenEAttr) {
106 uint32_t aal = 126 uint32_t aal =
107 le32_t 127 le32_to_cpu(eahd->appAttrLocation);
108 memmove(&ea[of 128 memmove(&ea[offset - aal + size],
109 &ea[aa 129 &ea[aal], offset - aal);
110 offset -= aal; 130 offset -= aal;
111 eahd->appAttrL 131 eahd->appAttrLocation =
112 132 cpu_to_le32(aal + size);
113 } 133 }
114 } 134 }
115 /* rewrite CRC + checksum of e 135 /* rewrite CRC + checksum of eahd */
116 crclen = sizeof(struct extende 136 crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(struct tag);
117 eahd->descTag.descCRCLength = 137 eahd->descTag.descCRCLength = cpu_to_le16(crclen);
118 eahd->descTag.descCRC = cpu_to 138 eahd->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)eahd +
119 139 sizeof(struct tag), crclen));
120 eahd->descTag.tagChecksum = ud 140 eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag);
121 iinfo->i_lenEAttr += size; 141 iinfo->i_lenEAttr += size;
122 return (struct genericFormat * 142 return (struct genericFormat *)&ea[offset];
123 } 143 }
124 144
125 return NULL; 145 return NULL;
126 } 146 }
127 147
128 struct genericFormat *udf_get_extendedattr(str 148 struct genericFormat *udf_get_extendedattr(struct inode *inode, uint32_t type,
129 uin 149 uint8_t subtype)
130 { 150 {
131 struct genericFormat *gaf; 151 struct genericFormat *gaf;
132 uint8_t *ea = NULL; 152 uint8_t *ea = NULL;
133 uint32_t offset; 153 uint32_t offset;
134 struct udf_inode_info *iinfo = UDF_I(i 154 struct udf_inode_info *iinfo = UDF_I(inode);
135 155
136 ea = iinfo->i_data; 156 ea = iinfo->i_data;
137 157
138 if (iinfo->i_lenEAttr) { 158 if (iinfo->i_lenEAttr) {
139 struct extendedAttrHeaderDesc 159 struct extendedAttrHeaderDesc *eahd;
140 eahd = (struct extendedAttrHea 160 eahd = (struct extendedAttrHeaderDesc *)ea;
141 161
142 /* check checksum/crc */ 162 /* check checksum/crc */
143 if (eahd->descTag.tagIdent != 163 if (eahd->descTag.tagIdent !=
144 cpu_to_le16(TA 164 cpu_to_le16(TAG_IDENT_EAHD) ||
145 le32_to_cpu(eahd->descTag. 165 le32_to_cpu(eahd->descTag.tagLocation) !=
146 iinfo->i_locat 166 iinfo->i_location.logicalBlockNum)
147 return NULL; 167 return NULL;
148 168
149 if (type < 2048) 169 if (type < 2048)
150 offset = sizeof(struct 170 offset = sizeof(struct extendedAttrHeaderDesc);
151 else if (type < 65536) 171 else if (type < 65536)
152 offset = le32_to_cpu(e 172 offset = le32_to_cpu(eahd->impAttrLocation);
153 else 173 else
154 offset = le32_to_cpu(e 174 offset = le32_to_cpu(eahd->appAttrLocation);
155 175
156 while (offset + sizeof(*gaf) < 176 while (offset + sizeof(*gaf) < iinfo->i_lenEAttr) {
157 uint32_t attrLength; 177 uint32_t attrLength;
158 178
159 gaf = (struct genericF 179 gaf = (struct genericFormat *)&ea[offset];
160 attrLength = le32_to_c 180 attrLength = le32_to_cpu(gaf->attrLength);
161 181
162 /* Detect undersized e 182 /* Detect undersized elements and buffer overflows */
163 if ((attrLength < size 183 if ((attrLength < sizeof(*gaf)) ||
164 (attrLength > (iin 184 (attrLength > (iinfo->i_lenEAttr - offset)))
165 break; 185 break;
166 186
167 if (le32_to_cpu(gaf->a 187 if (le32_to_cpu(gaf->attrType) == type &&
168 gaf->a 188 gaf->attrSubtype == subtype)
169 return gaf; 189 return gaf;
170 else 190 else
171 offset += attr 191 offset += attrLength;
172 } 192 }
173 } 193 }
174 194
175 return NULL; 195 return NULL;
176 } 196 }
177 197
178 /* 198 /*
179 * udf_read_tagged 199 * udf_read_tagged
180 * 200 *
181 * PURPOSE 201 * PURPOSE
182 * Read the first block of a tagged descr 202 * Read the first block of a tagged descriptor.
183 * 203 *
184 * HISTORY 204 * HISTORY
185 * July 1, 1997 - Andrew E. Mileski 205 * July 1, 1997 - Andrew E. Mileski
186 * Written, tested, and released. 206 * Written, tested, and released.
187 */ 207 */
188 struct buffer_head *udf_read_tagged(struct sup 208 struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block,
189 uint32_t l 209 uint32_t location, uint16_t *ident)
190 { 210 {
191 struct tag *tag_p; 211 struct tag *tag_p;
192 struct buffer_head *bh = NULL; 212 struct buffer_head *bh = NULL;
193 u8 checksum; 213 u8 checksum;
194 214
195 /* Read the block */ 215 /* Read the block */
196 if (block == 0xFFFFFFFF) 216 if (block == 0xFFFFFFFF)
197 return NULL; 217 return NULL;
198 218
199 bh = sb_bread(sb, block); !! 219 bh = udf_tread(sb, block);
200 if (!bh) { 220 if (!bh) {
201 udf_err(sb, "read failed, bloc 221 udf_err(sb, "read failed, block=%u, location=%u\n",
202 block, location); 222 block, location);
203 return NULL; 223 return NULL;
204 } 224 }
205 225
206 tag_p = (struct tag *)(bh->b_data); 226 tag_p = (struct tag *)(bh->b_data);
207 227
208 *ident = le16_to_cpu(tag_p->tagIdent); 228 *ident = le16_to_cpu(tag_p->tagIdent);
209 229
210 if (location != le32_to_cpu(tag_p->tag 230 if (location != le32_to_cpu(tag_p->tagLocation)) {
211 udf_debug("location mismatch b 231 udf_debug("location mismatch block %u, tag %u != %u\n",
212 block, le32_to_cpu(t 232 block, le32_to_cpu(tag_p->tagLocation), location);
213 goto error_out; 233 goto error_out;
214 } 234 }
215 235
216 /* Verify the tag checksum */ 236 /* Verify the tag checksum */
217 checksum = udf_tag_checksum(tag_p); 237 checksum = udf_tag_checksum(tag_p);
218 if (checksum != tag_p->tagChecksum) { 238 if (checksum != tag_p->tagChecksum) {
219 udf_err(sb, "tag checksum fail 239 udf_err(sb, "tag checksum failed, block %u: 0x%02x != 0x%02x\n",
220 block, checksum, tag_p 240 block, checksum, tag_p->tagChecksum);
221 goto error_out; 241 goto error_out;
222 } 242 }
223 243
224 /* Verify the tag version */ 244 /* Verify the tag version */
225 if (tag_p->descVersion != cpu_to_le16( 245 if (tag_p->descVersion != cpu_to_le16(0x0002U) &&
226 tag_p->descVersion != cpu_to_le16( 246 tag_p->descVersion != cpu_to_le16(0x0003U)) {
227 udf_err(sb, "tag version 0x%04 247 udf_err(sb, "tag version 0x%04x != 0x0002 || 0x0003, block %u\n",
228 le16_to_cpu(tag_p->des 248 le16_to_cpu(tag_p->descVersion), block);
229 goto error_out; 249 goto error_out;
230 } 250 }
231 251
232 /* Verify the descriptor CRC */ 252 /* Verify the descriptor CRC */
233 if (le16_to_cpu(tag_p->descCRCLength) 253 if (le16_to_cpu(tag_p->descCRCLength) + sizeof(struct tag) > sb->s_blocksize ||
234 le16_to_cpu(tag_p->descCRC) == crc 254 le16_to_cpu(tag_p->descCRC) == crc_itu_t(0,
235 bh->b_ 255 bh->b_data + sizeof(struct tag),
236 le16_t 256 le16_to_cpu(tag_p->descCRCLength)))
237 return bh; 257 return bh;
238 258
239 udf_debug("Crc failure block %u: crc = 259 udf_debug("Crc failure block %u: crc = %u, crclen = %u\n", block,
240 le16_to_cpu(tag_p->descCRC), 260 le16_to_cpu(tag_p->descCRC),
241 le16_to_cpu(tag_p->descCRCLe 261 le16_to_cpu(tag_p->descCRCLength));
242 error_out: 262 error_out:
243 brelse(bh); 263 brelse(bh);
244 return NULL; 264 return NULL;
245 } 265 }
246 266
247 struct buffer_head *udf_read_ptagged(struct su 267 struct buffer_head *udf_read_ptagged(struct super_block *sb,
248 struct ke 268 struct kernel_lb_addr *loc,
249 uint32_t 269 uint32_t offset, uint16_t *ident)
250 { 270 {
251 return udf_read_tagged(sb, udf_get_lb_ 271 return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset),
252 loc->logicalBlo 272 loc->logicalBlockNum + offset, ident);
253 } 273 }
254 274
255 void udf_update_tag(char *data, int length) 275 void udf_update_tag(char *data, int length)
256 { 276 {
257 struct tag *tptr = (struct tag *)data; 277 struct tag *tptr = (struct tag *)data;
258 length -= sizeof(struct tag); 278 length -= sizeof(struct tag);
259 279
260 tptr->descCRCLength = cpu_to_le16(leng 280 tptr->descCRCLength = cpu_to_le16(length);
261 tptr->descCRC = cpu_to_le16(crc_itu_t( 281 tptr->descCRC = cpu_to_le16(crc_itu_t(0, data + sizeof(struct tag), length));
262 tptr->tagChecksum = udf_tag_checksum(t 282 tptr->tagChecksum = udf_tag_checksum(tptr);
263 } 283 }
264 284
265 void udf_new_tag(char *data, uint16_t ident, u 285 void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum,
266 uint32_t loc, int length) 286 uint32_t loc, int length)
267 { 287 {
268 struct tag *tptr = (struct tag *)data; 288 struct tag *tptr = (struct tag *)data;
269 tptr->tagIdent = cpu_to_le16(ident); 289 tptr->tagIdent = cpu_to_le16(ident);
270 tptr->descVersion = cpu_to_le16(versio 290 tptr->descVersion = cpu_to_le16(version);
271 tptr->tagSerialNum = cpu_to_le16(snum) 291 tptr->tagSerialNum = cpu_to_le16(snum);
272 tptr->tagLocation = cpu_to_le32(loc); 292 tptr->tagLocation = cpu_to_le32(loc);
273 udf_update_tag(data, length); 293 udf_update_tag(data, length);
274 } 294 }
275 295
276 u8 udf_tag_checksum(const struct tag *t) 296 u8 udf_tag_checksum(const struct tag *t)
277 { 297 {
278 u8 *data = (u8 *)t; 298 u8 *data = (u8 *)t;
279 u8 checksum = 0; 299 u8 checksum = 0;
280 int i; 300 int i;
281 for (i = 0; i < sizeof(struct tag); ++ 301 for (i = 0; i < sizeof(struct tag); ++i)
282 if (i != 4) /* position of che 302 if (i != 4) /* position of checksum */
283 checksum += data[i]; 303 checksum += data[i];
284 return checksum; 304 return checksum;
285 } 305 }
286 306
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