scripts/mod/sumversion.c

   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 }