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revert-mm-fix-blkdev-size-calculation-in-generic_write_checks
[linux-2.6/linux-trees-mm.git] / scripts / mod / sumversion.c
blobd9cc6901d68082ea74a2add806d72b01738679c4
1 #include <netinet/in.h>
2 #ifdef __sun__
3 #include <inttypes.h>
4 #else
5 #include <stdint.h>
6 #endif
7 #include <ctype.h>
8 #include <errno.h>
9 #include <string.h>
10 #include <limits.h>
11 #include "modpost.h"
12
13 /*
14 * Stolen form Cryptographic API.
15 *
16 * MD4 Message Digest Algorithm (RFC1320).
17 *
18 * Implementation derived from Andrew Tridgell and Steve French's
19 * CIFS MD4 implementation, and the cryptoapi implementation
20 * originally based on the public domain implementation written
21 * by Colin Plumb in 1993.
22 *
23 * Copyright (c) Andrew Tridgell 1997-1998.
24 * Modified by Steve French (sfrench@us.ibm.com) 2002
25 * Copyright (c) Cryptoapi developers.
26 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
27 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
28 *
29 * This program is free software; you can redistribute it and/or modify
30 * it under the terms of the GNU General Public License as published by
31 * the Free Software Foundation; either version 2 of the License, or
32 * (at your option) any later version.
33 *
34 */
35 #define MD4_DIGEST_SIZE 16
36 #define MD4_HMAC_BLOCK_SIZE 64
37 #define MD4_BLOCK_WORDS 16
38 #define MD4_HASH_WORDS 4
39
40 struct md4_ctx {
41 uint32_t hash[MD4_HASH_WORDS];
42 uint32_t block[MD4_BLOCK_WORDS];
43 uint64_t byte_count;
44 };
45
46 static inline uint32_t lshift(uint32_t x, unsigned int s)
47 {
48 x &= 0xFFFFFFFF;
49 return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
50 }
51
52 static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
53 {
54 return (x & y) | ((~x) & z);
55 }
56
57 static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
58 {
59 return (x & y) | (x & z) | (y & z);
60 }
61
62 static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
63 {
64 return x ^ y ^ z;
65 }
66
67 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
68 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
69 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))
70
71 /* XXX: this stuff can be optimized */
72 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
73 {
74 while (words--) {
75 *buf = ntohl(*buf);
76 buf++;
77 }
78 }
79
80 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
81 {
82 while (words--) {
83 *buf = htonl(*buf);
84 buf++;
85 }
86 }
87
88 static void md4_transform(uint32_t *hash, uint32_t const *in)
89 {
90 uint32_t a, b, c, d;
91
92 a = hash[0];
93 b = hash[1];
94 c = hash[2];
95 d = hash[3];
96
97 ROUND1(a, b, c, d, in[0], 3);
98 ROUND1(d, a, b, c, in[1], 7);
99 ROUND1(c, d, a, b, in[2], 11);
100 ROUND1(b, c, d, a, in[3], 19);
101 ROUND1(a, b, c, d, in[4], 3);
102 ROUND1(d, a, b, c, in[5], 7);
103 ROUND1(c, d, a, b, in[6], 11);
104 ROUND1(b, c, d, a, in[7], 19);
105 ROUND1(a, b, c, d, in[8], 3);
106 ROUND1(d, a, b, c, in[9], 7);
107 ROUND1(c, d, a, b, in[10], 11);
108 ROUND1(b, c, d, a, in[11], 19);
109 ROUND1(a, b, c, d, in[12], 3);
110 ROUND1(d, a, b, c, in[13], 7);
111 ROUND1(c, d, a, b, in[14], 11);
112 ROUND1(b, c, d, a, in[15], 19);
113
114 ROUND2(a, b, c, d,in[ 0], 3);
115 ROUND2(d, a, b, c, in[4], 5);
116 ROUND2(c, d, a, b, in[8], 9);
117 ROUND2(b, c, d, a, in[12], 13);
118 ROUND2(a, b, c, d, in[1], 3);
119 ROUND2(d, a, b, c, in[5], 5);
120 ROUND2(c, d, a, b, in[9], 9);
121 ROUND2(b, c, d, a, in[13], 13);
122 ROUND2(a, b, c, d, in[2], 3);
123 ROUND2(d, a, b, c, in[6], 5);
124 ROUND2(c, d, a, b, in[10], 9);
125 ROUND2(b, c, d, a, in[14], 13);
126 ROUND2(a, b, c, d, in[3], 3);
127 ROUND2(d, a, b, c, in[7], 5);
128 ROUND2(c, d, a, b, in[11], 9);
129 ROUND2(b, c, d, a, in[15], 13);
130
131 ROUND3(a, b, c, d,in[ 0], 3);
132 ROUND3(d, a, b, c, in[8], 9);
133 ROUND3(c, d, a, b, in[4], 11);
134 ROUND3(b, c, d, a, in[12], 15);
135 ROUND3(a, b, c, d, in[2], 3);
136 ROUND3(d, a, b, c, in[10], 9);
137 ROUND3(c, d, a, b, in[6], 11);
138 ROUND3(b, c, d, a, in[14], 15);
139 ROUND3(a, b, c, d, in[1], 3);
140 ROUND3(d, a, b, c, in[9], 9);
141 ROUND3(c, d, a, b, in[5], 11);
142 ROUND3(b, c, d, a, in[13], 15);
143 ROUND3(a, b, c, d, in[3], 3);
144 ROUND3(d, a, b, c, in[11], 9);
145 ROUND3(c, d, a, b, in[7], 11);
146 ROUND3(b, c, d, a, in[15], 15);
147
148 hash[0] += a;
149 hash[1] += b;
150 hash[2] += c;
151 hash[3] += d;
152 }
153
154 static inline void md4_transform_helper(struct md4_ctx *ctx)
155 {
156 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
157 md4_transform(ctx->hash, ctx->block);
158 }
159
160 static void md4_init(struct md4_ctx *mctx)
161 {
162 mctx->hash[0] = 0x67452301;
163 mctx->hash[1] = 0xefcdab89;
164 mctx->hash[2] = 0x98badcfe;
165 mctx->hash[3] = 0x10325476;
166 mctx->byte_count = 0;
167 }
168
169 static void md4_update(struct md4_ctx *mctx,
170 const unsigned char *data, unsigned int len)
171 {
172 const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
173
174 mctx->byte_count += len;
175
176 if (avail > len) {
177 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
178 data, len);
179 return;
180 }
181
182 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
183 data, avail);
184
185 md4_transform_helper(mctx);
186 data += avail;
187 len -= avail;
188
189 while (len >= sizeof(mctx->block)) {
190 memcpy(mctx->block, data, sizeof(mctx->block));
191 md4_transform_helper(mctx);
192 data += sizeof(mctx->block);
193 len -= sizeof(mctx->block);
194 }
195
196 memcpy(mctx->block, data, len);
197 }
198
199 static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
200 {
201 const unsigned int offset = mctx->byte_count & 0x3f;
202 char *p = (char *)mctx->block + offset;
203 int padding = 56 - (offset + 1);
204
205 *p++ = 0x80;
206 if (padding < 0) {
207 memset(p, 0x00, padding + sizeof (uint64_t));
208 md4_transform_helper(mctx);
209 p = (char *)mctx->block;
210 padding = 56;
211 }
212
213 memset(p, 0, padding);
214 mctx->block[14] = mctx->byte_count << 3;
215 mctx->block[15] = mctx->byte_count >> 29;
216 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
217 sizeof(uint64_t)) / sizeof(uint32_t));
218 md4_transform(mctx->hash, mctx->block);
219 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
220
221 snprintf(out, len, "%08X%08X%08X%08X",
222 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
223 }
224
225 static inline void add_char(unsigned char c, struct md4_ctx *md)
226 {
227 md4_update(md, &c, 1);
228 }
229
230 static int parse_string(const char *file, unsigned long len,
231 struct md4_ctx *md)
232 {
233 unsigned long i;
234
235 add_char(file[0], md);
236 for (i = 1; i < len; i++) {
237 add_char(file[i], md);
238 if (file[i] == '"' && file[i-1] != '\\')
239 break;
240 }
241 return i;
242 }
243
244 static int parse_comment(const char *file, unsigned long len)
245 {
246 unsigned long i;
247
248 for (i = 2; i < len; i++) {
249 if (file[i-1] == '*' && file[i] == '/')
250 break;
251 }
252 return i;
253 }
254
255 /* FIXME: Handle .s files differently (eg. # starts comments) --RR */
256 static int parse_file(const char *fname, struct md4_ctx *md)
257 {
258 char *file;
259 unsigned long i, len;
260
261 file = grab_file(fname, &len);
262 if (!file)
263 return 0;
264
265 for (i = 0; i < len; i++) {
266 /* Collapse and ignore \ and CR. */
267 if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
268 i++;
269 continue;
270 }
271
272 /* Ignore whitespace */
273 if (isspace(file[i]))
274 continue;
275
276 /* Handle strings as whole units */
277 if (file[i] == '"') {
278 i += parse_string(file+i, len - i, md);
279 continue;
280 }
281
282 /* Comments: ignore */
283 if (file[i] == '/' && file[i+1] == '*') {
284 i += parse_comment(file+i, len - i);
285 continue;
286 }
287
288 add_char(file[i], md);
289 }
290 release_file(file, len);
291 return 1;
292 }
293
294 /* We have dir/file.o. Open dir/.file.o.cmd, look for deps_ line to
295 * figure out source file. */
296 static int parse_source_files(const char *objfile, struct md4_ctx *md)
297 {
298 char *cmd, *file, *line, *dir;
299 const char *base;
300 unsigned long flen, pos = 0;
301 int dirlen, ret = 0, check_files = 0;
302
303 cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
304
305 base = strrchr(objfile, '/');
306 if (base) {
307 base++;
308 dirlen = base - objfile;
309 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
310 } else {
311 dirlen = 0;
312 sprintf(cmd, ".%s.cmd", objfile);
313 }
314 dir = NOFAIL(malloc(dirlen + 1));
315 strncpy(dir, objfile, dirlen);
316 dir[dirlen] = '\0';
317
318 file = grab_file(cmd, &flen);
319 if (!file) {
320 warn("could not find %s for %s\n", cmd, objfile);
321 goto out;
322 }
323
324 /* There will be a line like so:
325 deps_drivers/net/dummy.o := \
326 drivers/net/dummy.c \
327 $(wildcard include/config/net/fastroute.h) \
328 include/linux/config.h \
329 $(wildcard include/config/h.h) \
330 include/linux/module.h \
331
332 Sum all files in the same dir or subdirs.
333 */
334 while ((line = get_next_line(&pos, file, flen)) != NULL) {
335 char* p = line;
336 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
337 check_files = 1;
338 continue;
339 }
340 if (!check_files)
341 continue;
342
343 /* Continue until line does not end with '\' */
344 if ( *(p + strlen(p)-1) != '\\')
345 break;
346 /* Terminate line at first space, to get rid of final ' \' */
347 while (*p) {
348 if (isspace(*p)) {
349 *p = '\0';
350 break;
351 }
352 p++;
353 }
354
355 /* Check if this file is in same dir as objfile */
356 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
357 if (!parse_file(line, md)) {
358 warn("could not open %s: %s\n",
359 line, strerror(errno));
360 goto out_file;
361 }
362
363 }
364
365 }
366
367 /* Everyone parsed OK */
368 ret = 1;
369 out_file:
370 release_file(file, flen);
371 out:
372 free(dir);
373 free(cmd);
374 return ret;
375 }
376
377 /* Calc and record src checksum. */
378 void get_src_version(const char *modname, char sum[], unsigned sumlen)
379 {
380 void *file;
381 unsigned long len;
382 struct md4_ctx md;
383 char *sources, *end, *fname;
384 const char *basename;
385 char filelist[PATH_MAX + 1];
386 char *modverdir = getenv("MODVERDIR");
387
388 if (!modverdir)
389 modverdir = ".";
390
391 /* Source files for module are in .tmp_versions/modname.mod,
392 after the first line. */
393 if (strrchr(modname, '/'))
394 basename = strrchr(modname, '/') + 1;
395 else
396 basename = modname;
397 sprintf(filelist, "%s/%.*s.mod", modverdir,
398 (int) strlen(basename) - 2, basename);
399
400 file = grab_file(filelist, &len);
401 if (!file)
402 /* not a module or .mod file missing - ignore */
403 return;
404
405 sources = strchr(file, '\n');
406 if (!sources) {
407 warn("malformed versions file for %s\n", modname);
408 goto release;
409 }
410
411 sources++;
412 end = strchr(sources, '\n');
413 if (!end) {
414 warn("bad ending versions file for %s\n", modname);
415 goto release;
416 }
417 *end = '\0';
418
419 md4_init(&md);
420 while ((fname = strsep(&sources, " ")) != NULL) {
421 if (!*fname)
422 continue;
423 if (!parse_source_files(fname, &md))
424 goto release;
425 }
426
427 md4_final_ascii(&md, sum, sumlen);
428 release:
429 release_file(file, len);
430 }
431
432 static void write_version(const char *filename, const char *sum,
433 unsigned long offset)
434 {
435 int fd;
436
437 fd = open(filename, O_RDWR);
438 if (fd < 0) {
439 warn("changing sum in %s failed: %s\n",
440 filename, strerror(errno));
441 return;
442 }
443
444 if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
445 warn("changing sum in %s:%lu failed: %s\n",
446 filename, offset, strerror(errno));
447 goto out;
448 }
449
450 if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
451 warn("writing sum in %s failed: %s\n",
452 filename, strerror(errno));
453 goto out;
454 }
455 out:
456 close(fd);
457 }
458
459 static int strip_rcs_crap(char *version)
460 {
461 unsigned int len, full_len;
462
463 if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
464 return 0;
465
466 /* Space for version string follows. */
467 full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;
468
469 /* Move string to start with version number: prefix will be
470 * $Revision$ or $Revision: */
471 len = strlen("$Revision");
472 if (version[len] == ':' || version[len] == '$')
473 len++;
474 while (isspace(version[len]))
475 len++;
476 memmove(version, version+len, full_len-len);
477 full_len -= len;
478
479 /* Preserve up to next whitespace. */
480 len = 0;
481 while (version[len] && !isspace(version[len]))
482 len++;
483 memmove(version + len, version + strlen(version),
484 full_len - strlen(version));
485 return 1;
486 }
487
488 /* Clean up RCS-style version numbers. */
489 void maybe_frob_rcs_version(const char *modfilename,
490 char *version,
491 void *modinfo,
492 unsigned long version_offset)
493 {
494 if (strip_rcs_crap(version))
495 write_version(modfilename, version, version_offset);
496 }
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