scripts/sumversion.c

   1 #include <netinet/in.h>
   2 #include <stdint.h>
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <string.h>
   6 #include "modpost.h"
   7
   8 /* Parse tag=value strings from .modinfo section */
   9 static char *next_string(char *string, unsigned long *secsize)
  10 {
  11         /* Skip non-zero chars */
  12         while (string[0]) {
  13                 string++;
  14                 if ((*secsize)-- <= 1)
  15                         return NULL;
  16         }
  17
  18         /* Skip any zero padding. */
  19         while (!string[0]) {
  20                 string++;
  21                 if ((*secsize)-- <= 1)
  22                         return NULL;
  23         }
  24         return string;
  25 }
  26
  27 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
  28                          const char *tag)
  29 {
  30         char *p;
  31         unsigned int taglen = strlen(tag);
  32         unsigned long size = modinfo_len;
  33
  34         for (p = modinfo; p; p = next_string(p, &size)) {
  35                 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
  36                         return p + taglen + 1;
  37         }
  38         return NULL;
  39 }
  40
  41 /*
  42  * Stolen form Cryptographic API.
  43  *
  44  * MD4 Message Digest Algorithm (RFC1320).
  45  *
  46  * Implementation derived from Andrew Tridgell and Steve French's
  47  * CIFS MD4 implementation, and the cryptoapi implementation
  48  * originally based on the public domain implementation written
  49  * by Colin Plumb in 1993.
  50  *
  51  * Copyright (c) Andrew Tridgell 1997-1998.
  52  * Modified by Steve French (sfrench@us.ibm.com) 2002
  53  * Copyright (c) Cryptoapi developers.
  54  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
  55  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  56  *
  57  * This program is free software; you can redistribute it and/or modify
  58  * it under the terms of the GNU General Public License as published by
  59  * the Free Software Foundation; either version 2 of the License, or
  60  * (at your option) any later version.
  61  *
  62  */
  63 #define MD4_DIGEST_SIZE         16
  64 #define MD4_HMAC_BLOCK_SIZE     64
  65 #define MD4_BLOCK_WORDS         16
  66 #define MD4_HASH_WORDS          4
  67
  68 struct md4_ctx {
  69         uint32_t hash[MD4_HASH_WORDS];
  70         uint32_t block[MD4_BLOCK_WORDS];
  71         uint64_t byte_count;
  72 };
  73
  74 static inline uint32_t lshift(uint32_t x, unsigned int s)
  75 {
  76         x &= 0xFFFFFFFF;
  77         return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
  78 }
  79
  80 static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
  81 {
  82         return (x & y) | ((~x) & z);
  83 }
  84
  85 static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
  86 {
  87         return (x & y) | (x & z) | (y & z);
  88 }
  89
  90 static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
  91 {
  92         return x ^ y ^ z;
  93 }
  94
  95 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
  96 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
  97 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))
  98
  99 /* XXX: this stuff can be optimized */
 100 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
 101 {
 102         while (words--) {
 103                 *buf = ntohl(*buf);
 104                 buf++;
 105         }
 106 }
 107
 108 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
 109 {
 110         while (words--) {
 111                 *buf = htonl(*buf);
 112                 buf++;
 113         }
 114 }
 115
 116 static void md4_transform(uint32_t *hash, uint32_t const *in)
 117 {
 118         uint32_t a, b, c, d;
 119
 120         a = hash[0];
 121         b = hash[1];
 122         c = hash[2];
 123         d = hash[3];
 124
 125         ROUND1(a, b, c, d, in[0], 3);
 126         ROUND1(d, a, b, c, in[1], 7);
 127         ROUND1(c, d, a, b, in[2], 11);
 128         ROUND1(b, c, d, a, in[3], 19);
 129         ROUND1(a, b, c, d, in[4], 3);
 130         ROUND1(d, a, b, c, in[5], 7);
 131         ROUND1(c, d, a, b, in[6], 11);
 132         ROUND1(b, c, d, a, in[7], 19);
 133         ROUND1(a, b, c, d, in[8], 3);
 134         ROUND1(d, a, b, c, in[9], 7);
 135         ROUND1(c, d, a, b, in[10], 11);
 136         ROUND1(b, c, d, a, in[11], 19);
 137         ROUND1(a, b, c, d, in[12], 3);
 138         ROUND1(d, a, b, c, in[13], 7);
 139         ROUND1(c, d, a, b, in[14], 11);
 140         ROUND1(b, c, d, a, in[15], 19);
 141
 142         ROUND2(a, b, c, d,in[ 0], 3);
 143         ROUND2(d, a, b, c, in[4], 5);
 144         ROUND2(c, d, a, b, in[8], 9);
 145         ROUND2(b, c, d, a, in[12], 13);
 146         ROUND2(a, b, c, d, in[1], 3);
 147         ROUND2(d, a, b, c, in[5], 5);
 148         ROUND2(c, d, a, b, in[9], 9);
 149         ROUND2(b, c, d, a, in[13], 13);
 150         ROUND2(a, b, c, d, in[2], 3);
 151         ROUND2(d, a, b, c, in[6], 5);
 152         ROUND2(c, d, a, b, in[10], 9);
 153         ROUND2(b, c, d, a, in[14], 13);
 154         ROUND2(a, b, c, d, in[3], 3);
 155         ROUND2(d, a, b, c, in[7], 5);
 156         ROUND2(c, d, a, b, in[11], 9);
 157         ROUND2(b, c, d, a, in[15], 13);
 158
 159         ROUND3(a, b, c, d,in[ 0], 3);
 160         ROUND3(d, a, b, c, in[8], 9);
 161         ROUND3(c, d, a, b, in[4], 11);
 162         ROUND3(b, c, d, a, in[12], 15);
 163         ROUND3(a, b, c, d, in[2], 3);
 164         ROUND3(d, a, b, c, in[10], 9);
 165         ROUND3(c, d, a, b, in[6], 11);
 166         ROUND3(b, c, d, a, in[14], 15);
 167         ROUND3(a, b, c, d, in[1], 3);
 168         ROUND3(d, a, b, c, in[9], 9);
 169         ROUND3(c, d, a, b, in[5], 11);
 170         ROUND3(b, c, d, a, in[13], 15);
 171         ROUND3(a, b, c, d, in[3], 3);
 172         ROUND3(d, a, b, c, in[11], 9);
 173         ROUND3(c, d, a, b, in[7], 11);
 174         ROUND3(b, c, d, a, in[15], 15);
 175
 176         hash[0] += a;
 177         hash[1] += b;
 178         hash[2] += c;
 179         hash[3] += d;
 180 }
 181
 182 static inline void md4_transform_helper(struct md4_ctx *ctx)
 183 {
 184         le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
 185         md4_transform(ctx->hash, ctx->block);
 186 }
 187
 188 static void md4_init(struct md4_ctx *mctx)
 189 {
 190         mctx->hash[0] = 0x67452301;
 191         mctx->hash[1] = 0xefcdab89;
 192         mctx->hash[2] = 0x98badcfe;
 193         mctx->hash[3] = 0x10325476;
 194         mctx->byte_count = 0;
 195 }
 196
 197 static void md4_update(struct md4_ctx *mctx,
 198                        const unsigned char *data, unsigned int len)
 199 {
 200         const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 201
 202         mctx->byte_count += len;
 203
 204         if (avail > len) {
 205                 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 206                        data, len);
 207                 return;
 208         }
 209
 210         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 211                data, avail);
 212
 213         md4_transform_helper(mctx);
 214         data += avail;
 215         len -= avail;
 216
 217         while (len >= sizeof(mctx->block)) {
 218                 memcpy(mctx->block, data, sizeof(mctx->block));
 219                 md4_transform_helper(mctx);
 220                 data += sizeof(mctx->block);
 221                 len -= sizeof(mctx->block);
 222         }
 223
 224         memcpy(mctx->block, data, len);
 225 }
 226
 227 static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
 228 {
 229         const unsigned int offset = mctx->byte_count & 0x3f;
 230         char *p = (char *)mctx->block + offset;
 231         int padding = 56 - (offset + 1);
 232
 233         *p++ = 0x80;
 234         if (padding < 0) {
 235                 memset(p, 0x00, padding + sizeof (uint64_t));
 236                 md4_transform_helper(mctx);
 237                 p = (char *)mctx->block;
 238                 padding = 56;
 239         }
 240
 241         memset(p, 0, padding);
 242         mctx->block[14] = mctx->byte_count << 3;
 243         mctx->block[15] = mctx->byte_count >> 29;
 244         le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
 245                           sizeof(uint64_t)) / sizeof(uint32_t));
 246         md4_transform(mctx->hash, mctx->block);
 247         cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
 248
 249         snprintf(out, len, "%08X%08X%08X%08X",
 250                  mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
 251 }
 252
 253 static inline void add_char(unsigned char c, struct md4_ctx *md)
 254 {
 255         md4_update(md, &c, 1);
 256 }
 257
 258 static int parse_string(const char *file, unsigned long len,
 259                         struct md4_ctx *md)
 260 {
 261         unsigned long i;
 262
 263         add_char(file[0], md);
 264         for (i = 1; i < len; i++) {
 265                 add_char(file[i], md);
 266                 if (file[i] == '"' && file[i-1] != '\\')
 267                         break;
 268         }
 269         return i;
 270 }
 271
 272 static int parse_comment(const char *file, unsigned long len)
 273 {
 274         unsigned long i;
 275
 276         for (i = 2; i < len; i++) {
 277                 if (file[i-1] == '*' && file[i] == '/')
 278                         break;
 279         }
 280         return i;
 281 }
 282
 283 /* FIXME: Handle .s files differently (eg. # starts comments) --RR */
 284 static int parse_file(const char *fname, struct md4_ctx *md)
 285 {
 286         char *file;
 287         unsigned long i, len;
 288
 289         file = grab_file(fname, &len);
 290         if (!file)
 291                 return 0;
 292
 293         for (i = 0; i < len; i++) {
 294                 /* Collapse and ignore \ and CR. */
 295                 if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
 296                         i++;
 297                         continue;
 298                 }
 299
 300                 /* Ignore whitespace */
 301                 if (isspace(file[i]))
 302                         continue;
 303
 304                 /* Handle strings as whole units */
 305                 if (file[i] == '"') {
 306                         i += parse_string(file+i, len - i, md);
 307                         continue;
 308                 }
 309
 310                 /* Comments: ignore */
 311                 if (file[i] == '/' && file[i+1] == '*') {
 312                         i += parse_comment(file+i, len - i);
 313                         continue;
 314                 }
 315
 316                 add_char(file[i], md);
 317         }
 318         release_file(file, len);
 319         return 1;
 320 }
 321
 322 /* We have dir/file.o.  Open dir/.file.o.cmd, look for deps_ line to
 323  * figure out source file. */
 324 static int parse_source_files(const char *objfile, struct md4_ctx *md)
 325 {
 326         char *cmd, *file, *line, *dir;
 327         const char *base;
 328         unsigned long flen, pos = 0;
 329         int dirlen, ret = 0, check_files = 0;
 330
 331         cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
 332
 333         base = strrchr(objfile, '/');
 334         if (base) {
 335                 base++;
 336                 dirlen = base - objfile;
 337                 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
 338         } else {
 339                 dirlen = 0;
 340                 sprintf(cmd, ".%s.cmd", objfile);
 341         }
 342         dir = NOFAIL(malloc(dirlen + 1));
 343         strncpy(dir, objfile, dirlen);
 344         dir[dirlen] = '\0';
 345
 346         file = grab_file(cmd, &flen);
 347         if (!file) {
 348                 fprintf(stderr, "Warning: could not find %s for %s\n",
 349                         cmd, objfile);
 350                 goto out;
 351         }
 352
 353         /* There will be a line like so:
 354                 deps_drivers/net/dummy.o := \
 355                   drivers/net/dummy.c \
 356                     $(wildcard include/config/net/fastroute.h) \
 357                   include/linux/config.h \
 358                     $(wildcard include/config/h.h) \
 359                   include/linux/module.h \
 360
 361            Sum all files in the same dir or subdirs.
 362         */
 363         while ((line = get_next_line(&pos, file, flen)) != NULL) {
 364                 char* p = line;
 365                 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
 366                         check_files = 1;
 367                         continue;
 368                 }
 369                 if (!check_files)
 370                         continue;
 371
 372                 /* Continue until line does not end with '\' */
 373                 if ( *(p + strlen(p)-1) != '\\')
 374                         break;
 375                 /* Terminate line at first space, to get rid of final ' \' */
 376                 while (*p) {
 377                         if isspace(*p) {
 378                                 *p = '\0';
 379                                 break;
 380                         }
 381                         p++;
 382                 }
 383
 384                 /* Check if this file is in same dir as objfile */
 385                 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
 386                         if (!parse_file(line, md)) {
 387                                 fprintf(stderr,
 388                                         "Warning: could not open %s: %s\n",
 389                                         line, strerror(errno));
 390                                 goto out_file;
 391                         }
 392
 393                 }
 394
 395         }
 396
 397         /* Everyone parsed OK */
 398         ret = 1;
 399 out_file:
 400         release_file(file, flen);
 401 out:
 402         free(dir);
 403         free(cmd);
 404         return ret;
 405 }
 406
 407 static int get_version(const char *modname, char sum[])
 408 {
 409         void *file;
 410         unsigned long len;
 411         int ret = 0;
 412         struct md4_ctx md;
 413         char *sources, *end, *fname;
 414         const char *basename;
 415         char filelist[sizeof(".tmp_versions/%s.mod") + strlen(modname)];
 416
 417         /* Source files for module are in .tmp_versions/modname.mod,
 418            after the first line. */
 419         if (strrchr(modname, '/'))
 420                 basename = strrchr(modname, '/') + 1;
 421         else
 422                 basename = modname;
 423         sprintf(filelist, ".tmp_versions/%s", basename);
 424         /* Truncate .o, add .mod */
 425         strcpy(filelist + strlen(filelist)-2, ".mod");
 426
 427         file = grab_file(filelist, &len);
 428         if (!file) {
 429                 fprintf(stderr, "Warning: could not find versions for %s\n",
 430                         filelist);
 431                 return 0;
 432         }
 433
 434         sources = strchr(file, '\n');
 435         if (!sources) {
 436                 fprintf(stderr, "Warning: malformed versions file for %s\n",
 437                         modname);
 438                 goto release;
 439         }
 440
 441         sources++;
 442         end = strchr(sources, '\n');
 443         if (!end) {
 444                 fprintf(stderr, "Warning: bad ending versions file for %s\n",
 445                         modname);
 446                 goto release;
 447         }
 448         *end = '\0';
 449
 450         md4_init(&md);
 451         for (fname = strtok(sources, " "); fname; fname = strtok(NULL, " ")) {
 452                 if (!parse_source_files(fname, &md))
 453                         goto release;
 454         }
 455
 456         /* sum is of form \0<padding>. */
 457         md4_final_ascii(&md, sum, 1 + strlen(sum+1));
 458         ret = 1;
 459 release:
 460         release_file(file, len);
 461         return ret;
 462 }
 463
 464 static void write_version(const char *filename, const char *sum,
 465                           unsigned long offset)
 466 {
 467         int fd;
 468
 469         fd = open(filename, O_RDWR);
 470         if (fd < 0) {
 471                 fprintf(stderr, "Warning: changing sum in %s failed: %s\n",
 472                         filename, strerror(errno));
 473                 return;
 474         }
 475
 476         if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
 477                 fprintf(stderr, "Warning: changing sum in %s:%lu failed: %s\n",
 478                         filename, offset, strerror(errno));
 479                 goto out;
 480         }
 481
 482         if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
 483                 fprintf(stderr, "Warning: writing sum in %s failed: %s\n",
 484                         filename, strerror(errno));
 485                 goto out;
 486         }
 487 out:
 488         close(fd);
 489 }
 490
 491 void strip_rcs_crap(char *version)
 492 {
 493         unsigned int len, full_len;
 494
 495         if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
 496                 return;
 497
 498         /* Space for version string follows. */
 499         full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;
 500
 501         /* Move string to start with version number: prefix will be
 502          * $Revision$ or $Revision: */
 503         len = strlen("$Revision");
 504         if (version[len] == ':' || version[len] == '$')
 505                 len++;
 506         while (isspace(version[len]))
 507                 len++;
 508         memmove(version, version+len, full_len-len);
 509         full_len -= len;
 510
 511         /* Preserve up to next whitespace. */
 512         len = 0;
 513         while (version[len] && !isspace(version[len]))
 514                 len++;
 515         memmove(version + len, version + strlen(version),
 516                 full_len - strlen(version));
 517 }
 518
 519 /* If the modinfo contains a "version" value, then set this. */
 520 void maybe_frob_version(const char *modfilename,
 521                         void *modinfo,
 522                         unsigned long modinfo_len,
 523                         unsigned long modinfo_offset)
 524 {
 525         char *version, *csum;
 526
 527         version = get_modinfo(modinfo, modinfo_len, "version");
 528         if (!version)
 529                 return;
 530
 531         /* RCS $Revision gets stripped out. */
 532         strip_rcs_crap(version);
 533
 534         /* Check against double sumversion */
 535         if (strchr(version, ' '))
 536                 return;
 537
 538         /* Version contains embedded NUL: second half has space for checksum */
 539         csum = version + strlen(version);
 540         *(csum++) = ' ';
 541         if (get_version(modfilename, csum))
 542                 write_version(modfilename, version,
 543                               modinfo_offset + (version - (char *)modinfo));
 544 }