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 "modpost.h"
  11
  12 /* Parse tag=value strings from .modinfo section */
  13 static char *next_string(char *string, unsigned long *secsize)
  14 {
  15         /* Skip non-zero chars */
  16         while (string[0]) {
  17                 string++;
  18                 if ((*secsize)-- <= 1)
  19                         return NULL;
  20         }
  21
  22         /* Skip any zero padding. */
  23         while (!string[0]) {
  24                 string++;
  25                 if ((*secsize)-- <= 1)
  26                         return NULL;
  27         }
  28         return string;
  29 }
  30
  31 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
  32                          const char *tag)
  33 {
  34         char *p;
  35         unsigned int taglen = strlen(tag);
  36         unsigned long size = modinfo_len;
  37
  38         for (p = modinfo; p; p = next_string(p, &size)) {
  39                 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
  40                         return p + taglen + 1;
  41         }
  42         return NULL;
  43 }
  44
  45 /*
  46  * Stolen form Cryptographic API.
  47  *
  48  * MD4 Message Digest Algorithm (RFC1320).
  49  *
  50  * Implementation derived from Andrew Tridgell and Steve French's
  51  * CIFS MD4 implementation, and the cryptoapi implementation
  52  * originally based on the public domain implementation written
  53  * by Colin Plumb in 1993.
  54  *
  55  * Copyright (c) Andrew Tridgell 1997-1998.
  56  * Modified by Steve French (sfrench@us.ibm.com) 2002
  57  * Copyright (c) Cryptoapi developers.
  58  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
  59  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  60  *
  61  * This program is free software; you can redistribute it and/or modify
  62  * it under the terms of the GNU General Public License as published by
  63  * the Free Software Foundation; either version 2 of the License, or
  64  * (at your option) any later version.
  65  *
  66  */
  67 #define MD4_DIGEST_SIZE         16
  68 #define MD4_HMAC_BLOCK_SIZE     64
  69 #define MD4_BLOCK_WORDS         16
  70 #define MD4_HASH_WORDS          4
  71
  72 struct md4_ctx {
  73         uint32_t hash[MD4_HASH_WORDS];
  74         uint32_t block[MD4_BLOCK_WORDS];
  75         uint64_t byte_count;
  76 };
  77
  78 static inline uint32_t lshift(uint32_t x, unsigned int s)
  79 {
  80         x &= 0xFFFFFFFF;
  81         return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
  82 }
  83
  84 static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
  85 {
  86         return (x & y) | ((~x) & z);
  87 }
  88
  89 static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
  90 {
  91         return (x & y) | (x & z) | (y & z);
  92 }
  93
  94 static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
  95 {
  96         return x ^ y ^ z;
  97 }
  98
  99 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
 100 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
 101 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))
 102
 103 /* XXX: this stuff can be optimized */
 104 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
 105 {
 106         while (words--) {
 107                 *buf = ntohl(*buf);
 108                 buf++;
 109         }
 110 }
 111
 112 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
 113 {
 114         while (words--) {
 115                 *buf = htonl(*buf);
 116                 buf++;
 117         }
 118 }
 119
 120 static void md4_transform(uint32_t *hash, uint32_t const *in)
 121 {
 122         uint32_t a, b, c, d;
 123
 124         a = hash[0];
 125         b = hash[1];
 126         c = hash[2];
 127         d = hash[3];
 128
 129         ROUND1(a, b, c, d, in[0], 3);
 130         ROUND1(d, a, b, c, in[1], 7);
 131         ROUND1(c, d, a, b, in[2], 11);
 132         ROUND1(b, c, d, a, in[3], 19);
 133         ROUND1(a, b, c, d, in[4], 3);
 134         ROUND1(d, a, b, c, in[5], 7);
 135         ROUND1(c, d, a, b, in[6], 11);
 136         ROUND1(b, c, d, a, in[7], 19);
 137         ROUND1(a, b, c, d, in[8], 3);
 138         ROUND1(d, a, b, c, in[9], 7);
 139         ROUND1(c, d, a, b, in[10], 11);
 140         ROUND1(b, c, d, a, in[11], 19);
 141         ROUND1(a, b, c, d, in[12], 3);
 142         ROUND1(d, a, b, c, in[13], 7);
 143         ROUND1(c, d, a, b, in[14], 11);
 144         ROUND1(b, c, d, a, in[15], 19);
 145
 146         ROUND2(a, b, c, d,in[ 0], 3);
 147         ROUND2(d, a, b, c, in[4], 5);
 148         ROUND2(c, d, a, b, in[8], 9);
 149         ROUND2(b, c, d, a, in[12], 13);
 150         ROUND2(a, b, c, d, in[1], 3);
 151         ROUND2(d, a, b, c, in[5], 5);
 152         ROUND2(c, d, a, b, in[9], 9);
 153         ROUND2(b, c, d, a, in[13], 13);
 154         ROUND2(a, b, c, d, in[2], 3);
 155         ROUND2(d, a, b, c, in[6], 5);
 156         ROUND2(c, d, a, b, in[10], 9);
 157         ROUND2(b, c, d, a, in[14], 13);
 158         ROUND2(a, b, c, d, in[3], 3);
 159         ROUND2(d, a, b, c, in[7], 5);
 160         ROUND2(c, d, a, b, in[11], 9);
 161         ROUND2(b, c, d, a, in[15], 13);
 162
 163         ROUND3(a, b, c, d,in[ 0], 3);
 164         ROUND3(d, a, b, c, in[8], 9);
 165         ROUND3(c, d, a, b, in[4], 11);
 166         ROUND3(b, c, d, a, in[12], 15);
 167         ROUND3(a, b, c, d, in[2], 3);
 168         ROUND3(d, a, b, c, in[10], 9);
 169         ROUND3(c, d, a, b, in[6], 11);
 170         ROUND3(b, c, d, a, in[14], 15);
 171         ROUND3(a, b, c, d, in[1], 3);
 172         ROUND3(d, a, b, c, in[9], 9);
 173         ROUND3(c, d, a, b, in[5], 11);
 174         ROUND3(b, c, d, a, in[13], 15);
 175         ROUND3(a, b, c, d, in[3], 3);
 176         ROUND3(d, a, b, c, in[11], 9);
 177         ROUND3(c, d, a, b, in[7], 11);
 178         ROUND3(b, c, d, a, in[15], 15);
 179
 180         hash[0] += a;
 181         hash[1] += b;
 182         hash[2] += c;
 183         hash[3] += d;
 184 }
 185
 186 static inline void md4_transform_helper(struct md4_ctx *ctx)
 187 {
 188         le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
 189         md4_transform(ctx->hash, ctx->block);
 190 }
 191
 192 static void md4_init(struct md4_ctx *mctx)
 193 {
 194         mctx->hash[0] = 0x67452301;
 195         mctx->hash[1] = 0xefcdab89;
 196         mctx->hash[2] = 0x98badcfe;
 197         mctx->hash[3] = 0x10325476;
 198         mctx->byte_count = 0;
 199 }
 200
 201 static void md4_update(struct md4_ctx *mctx,
 202                        const unsigned char *data, unsigned int len)
 203 {
 204         const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 205
 206         mctx->byte_count += len;
 207
 208         if (avail > len) {
 209                 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 210                        data, len);
 211                 return;
 212         }
 213
 214         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 215                data, avail);
 216
 217         md4_transform_helper(mctx);
 218         data += avail;
 219         len -= avail;
 220
 221         while (len >= sizeof(mctx->block)) {
 222                 memcpy(mctx->block, data, sizeof(mctx->block));
 223                 md4_transform_helper(mctx);
 224                 data += sizeof(mctx->block);
 225                 len -= sizeof(mctx->block);
 226         }
 227
 228         memcpy(mctx->block, data, len);
 229 }
 230
 231 static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
 232 {
 233         const unsigned int offset = mctx->byte_count & 0x3f;
 234         char *p = (char *)mctx->block + offset;
 235         int padding = 56 - (offset + 1);
 236
 237         *p++ = 0x80;
 238         if (padding < 0) {
 239                 memset(p, 0x00, padding + sizeof (uint64_t));
 240                 md4_transform_helper(mctx);
 241                 p = (char *)mctx->block;
 242                 padding = 56;
 243         }
 244
 245         memset(p, 0, padding);
 246         mctx->block[14] = mctx->byte_count << 3;
 247         mctx->block[15] = mctx->byte_count >> 29;
 248         le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
 249                           sizeof(uint64_t)) / sizeof(uint32_t));
 250         md4_transform(mctx->hash, mctx->block);
 251         cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
 252
 253         snprintf(out, len, "%08X%08X%08X%08X",
 254                  mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
 255 }
 256
 257 static inline void add_char(unsigned char c, struct md4_ctx *md)
 258 {
 259         md4_update(md, &c, 1);
 260 }
 261
 262 static int parse_string(const char *file, unsigned long len,
 263                         struct md4_ctx *md)
 264 {
 265         unsigned long i;
 266
 267         add_char(file[0], md);
 268         for (i = 1; i < len; i++) {
 269                 add_char(file[i], md);
 270                 if (file[i] == '"' && file[i-1] != '\\')
 271                         break;
 272         }
 273         return i;
 274 }
 275
 276 static int parse_comment(const char *file, unsigned long len)
 277 {
 278         unsigned long i;
 279
 280         for (i = 2; i < len; i++) {
 281                 if (file[i-1] == '*' && file[i] == '/')
 282                         break;
 283         }
 284         return i;
 285 }
 286
 287 /* FIXME: Handle .s files differently (eg. # starts comments) --RR */
 288 static int parse_file(const char *fname, struct md4_ctx *md)
 289 {
 290         char *file;
 291         unsigned long i, len;
 292
 293         file = grab_file(fname, &len);
 294         if (!file)
 295                 return 0;
 296
 297         for (i = 0; i < len; i++) {
 298                 /* Collapse and ignore \ and CR. */
 299                 if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
 300                         i++;
 301                         continue;
 302                 }
 303
 304                 /* Ignore whitespace */
 305                 if (isspace(file[i]))
 306                         continue;
 307
 308                 /* Handle strings as whole units */
 309                 if (file[i] == '"') {
 310                         i += parse_string(file+i, len - i, md);
 311                         continue;
 312                 }
 313
 314                 /* Comments: ignore */
 315                 if (file[i] == '/' && file[i+1] == '*') {
 316                         i += parse_comment(file+i, len - i);
 317                         continue;
 318                 }
 319
 320                 add_char(file[i], md);
 321         }
 322         release_file(file, len);
 323         return 1;
 324 }
 325
 326 /* We have dir/file.o.  Open dir/.file.o.cmd, look for deps_ line to
 327  * figure out source file. */
 328 static int parse_source_files(const char *objfile, struct md4_ctx *md)
 329 {
 330         char *cmd, *file, *line, *dir;
 331         const char *base;
 332         unsigned long flen, pos = 0;
 333         int dirlen, ret = 0, check_files = 0;
 334
 335         cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
 336
 337         base = strrchr(objfile, '/');
 338         if (base) {
 339                 base++;
 340                 dirlen = base - objfile;
 341                 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
 342         } else {
 343                 dirlen = 0;
 344                 sprintf(cmd, ".%s.cmd", objfile);
 345         }
 346         dir = NOFAIL(malloc(dirlen + 1));
 347         strncpy(dir, objfile, dirlen);
 348         dir[dirlen] = '\0';
 349
 350         file = grab_file(cmd, &flen);
 351         if (!file) {
 352                 fprintf(stderr, "Warning: could not find %s for %s\n",
 353                         cmd, objfile);
 354                 goto out;
 355         }
 356
 357         /* There will be a line like so:
 358                 deps_drivers/net/dummy.o := \
 359                   drivers/net/dummy.c \
 360                     $(wildcard include/config/net/fastroute.h) \
 361                   include/linux/config.h \
 362                     $(wildcard include/config/h.h) \
 363                   include/linux/module.h \
 364
 365            Sum all files in the same dir or subdirs.
 366         */
 367         while ((line = get_next_line(&pos, file, flen)) != NULL) {
 368                 char* p = line;
 369                 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
 370                         check_files = 1;
 371                         continue;
 372                 }
 373                 if (!check_files)
 374                         continue;
 375
 376                 /* Continue until line does not end with '\' */
 377                 if ( *(p + strlen(p)-1) != '\\')
 378                         break;
 379                 /* Terminate line at first space, to get rid of final ' \' */
 380                 while (*p) {
 381                        if (isspace(*p)) {
 382                                 *p = '\0';
 383                                 break;
 384                         }
 385                         p++;
 386                 }
 387
 388                 /* Check if this file is in same dir as objfile */
 389                 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
 390                         if (!parse_file(line, md)) {
 391                                 fprintf(stderr,
 392                                         "Warning: could not open %s: %s\n",
 393                                         line, strerror(errno));
 394                                 goto out_file;
 395                         }
 396
 397                 }
 398
 399         }
 400
 401         /* Everyone parsed OK */
 402         ret = 1;
 403 out_file:
 404         release_file(file, flen);
 405 out:
 406         free(dir);
 407         free(cmd);
 408         return ret;
 409 }
 410
 411 static int get_version(const char *modname, char sum[])
 412 {
 413         void *file;
 414         unsigned long len;
 415         int ret = 0;
 416         struct md4_ctx md;
 417         char *sources, *end, *fname;
 418         const char *basename;
 419         char filelist[sizeof(".tmp_versions/%s.mod") + strlen(modname)];
 420
 421         /* Source files for module are in .tmp_versions/modname.mod,
 422            after the first line. */
 423         if (strrchr(modname, '/'))
 424                 basename = strrchr(modname, '/') + 1;
 425         else
 426                 basename = modname;
 427         sprintf(filelist, ".tmp_versions/%s", basename);
 428         /* Truncate .o, add .mod */
 429         strcpy(filelist + strlen(filelist)-2, ".mod");
 430
 431         file = grab_file(filelist, &len);
 432         if (!file) {
 433                 fprintf(stderr, "Warning: could not find versions for %s\n",
 434                         filelist);
 435                 return 0;
 436         }
 437
 438         sources = strchr(file, '\n');
 439         if (!sources) {
 440                 fprintf(stderr, "Warning: malformed versions file for %s\n",
 441                         modname);
 442                 goto release;
 443         }
 444
 445         sources++;
 446         end = strchr(sources, '\n');
 447         if (!end) {
 448                 fprintf(stderr, "Warning: bad ending versions file for %s\n",
 449                         modname);
 450                 goto release;
 451         }
 452         *end = '\0';
 453
 454         md4_init(&md);
 455         for (fname = strtok(sources, " "); fname; fname = strtok(NULL, " ")) {
 456                 if (!parse_source_files(fname, &md))
 457                         goto release;
 458         }
 459
 460         /* sum is of form \0<padding>. */
 461         md4_final_ascii(&md, sum, 1 + strlen(sum+1));
 462         ret = 1;
 463 release:
 464         release_file(file, len);
 465         return ret;
 466 }
 467
 468 static void write_version(const char *filename, const char *sum,
 469                           unsigned long offset)
 470 {
 471         int fd;
 472
 473         fd = open(filename, O_RDWR);
 474         if (fd < 0) {
 475                 fprintf(stderr, "Warning: changing sum in %s failed: %s\n",
 476                         filename, strerror(errno));
 477                 return;
 478         }
 479
 480         if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
 481                 fprintf(stderr, "Warning: changing sum in %s:%lu failed: %s\n",
 482                         filename, offset, strerror(errno));
 483                 goto out;
 484         }
 485
 486         if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
 487                 fprintf(stderr, "Warning: writing sum in %s failed: %s\n",
 488                         filename, strerror(errno));
 489                 goto out;
 490         }
 491 out:
 492         close(fd);
 493 }
 494
 495 void strip_rcs_crap(char *version)
 496 {
 497         unsigned int len, full_len;
 498
 499         if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
 500                 return;
 501
 502         /* Space for version string follows. */
 503         full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;
 504
 505         /* Move string to start with version number: prefix will be
 506          * $Revision$ or $Revision: */
 507         len = strlen("$Revision");
 508         if (version[len] == ':' || version[len] == '$')
 509                 len++;
 510         while (isspace(version[len]))
 511                 len++;
 512         memmove(version, version+len, full_len-len);
 513         full_len -= len;
 514
 515         /* Preserve up to next whitespace. */
 516         len = 0;
 517         while (version[len] && !isspace(version[len]))
 518                 len++;
 519         memmove(version + len, version + strlen(version),
 520                 full_len - strlen(version));
 521 }
 522
 523 /* If the modinfo contains a "version" value, then set this. */
 524 void maybe_frob_version(const char *modfilename,
 525                         void *modinfo,
 526                         unsigned long modinfo_len,
 527                         unsigned long modinfo_offset)
 528 {
 529         char *version, *csum;
 530
 531         version = get_modinfo(modinfo, modinfo_len, "version");
 532         if (!version)
 533                 return;
 534
 535         /* RCS $Revision gets stripped out. */
 536         strip_rcs_crap(version);
 537
 538         /* Check against double sumversion */
 539         if (strchr(version, ' '))
 540                 return;
 541
 542         /* Version contains embedded NUL: second half has space for checksum */
 543         csum = version + strlen(version);
 544         *(csum++) = ' ';
 545         if (get_version(modfilename, csum))
 546                 write_version(modfilename, version,
 547                               modinfo_offset + (version - (char *)modinfo));
 548 }