1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include "_synonyms.h" 29 30 #include <sys/types.h> 31 #include <sys/mman.h> 32 #include <dirent.h> 33 #include <stdio.h> 34 #include <string.h> 35 #include <limits.h> 36 #include <debug.h> 37 #include <conv.h> 38 #include "_rtld.h" 39 #include "_audit.h" 40 #include "msg.h" 41 42 /* 43 * qsort(3c) comparison function. 44 */ 45 static int 46 compare(const void *fdesc1, const void *fdesc2) 47 { 48 ulong_t hwcap1 = ((Fdesc *)fdesc1)->fd_fmap.fm_hwptr; 49 ulong_t hwcap2 = ((Fdesc *)fdesc2)->fd_fmap.fm_hwptr; 50 51 if (hwcap1 && (hwcap2 == 0)) 52 return (-1); 53 if ((hwcap1 == 0) && hwcap2) 54 return (1); 55 if ((hwcap1 == 0) && (hwcap2 == 0)) 56 return (0); 57 58 if (hwcap1 > hwcap2) 59 return (-1); 60 if (hwcap1 < hwcap2) 61 return (1); 62 return (0); 63 } 64 65 /* 66 * If this object defines a set of hardware capability requirements, insure the 67 * kernal can cope with them. 68 */ 69 int 70 hwcap_check(Rej_desc *rej, Ehdr *ehdr) 71 { 72 Cap *cptr; 73 Phdr *phdr; 74 int cnt; 75 76 /* LINTED */ 77 phdr = (Phdr *)((char *)ehdr + ehdr->e_phoff); 78 for (cnt = 0; cnt < ehdr->e_phnum; cnt++, phdr++) { 79 Lword val; 80 81 if (phdr->p_type != PT_SUNWCAP) 82 continue; 83 84 /* LINTED */ 85 cptr = (Cap *)((char *)ehdr + phdr->p_offset); 86 while (cptr->c_tag != CA_SUNW_NULL) { 87 if (cptr->c_tag == CA_SUNW_HW_1) 88 break; 89 cptr++; 90 } 91 if (cptr->c_tag == CA_SUNW_NULL) 92 break; 93 94 if ((val = (cptr->c_un.c_val & ~hwcap)) != 0) { 95 rej->rej_type = SGS_REJ_HWCAP_1; 96 rej->rej_str = conv_cap_val_hw1(val, M_MACH); 97 return (0); 98 } 99 100 /* 101 * Retain this hardware capabilities pointer for possible later 102 * inspection should this object be processed as a filtee. 103 */ 104 fmap->fm_hwptr = cptr->c_un.c_val; 105 } 106 return (1); 107 } 108 109 static void 110 remove_fdesc(Fdesc *fdp) 111 { 112 #if defined(MAP_ALIGN) 113 if (fdp->fd_fmap.fm_maddr && 114 ((fdp->fd_fmap.fm_mflags & MAP_ALIGN) == 0)) { 115 #else 116 if (fdp->fd_fmap.fm_maddr) { 117 #endif 118 (void) munmap(fdp->fd_fmap.fm_maddr, fdp->fd_fmap.fm_msize); 119 120 /* 121 * Note, this file descriptor might be duplicating information 122 * from the global fmap descriptor. If so, clean up the global 123 * descriptor to prevent a duplicate (unnecessary) unmap. 124 */ 125 if (fmap->fm_maddr == fdp->fd_fmap.fm_maddr) { 126 fmap->fm_maddr = 0; 127 fmap_setup(); 128 } 129 } 130 if (fdp->fd_fd) 131 (void) close(fdp->fd_fd); 132 if (fdp->fd_pname && (fdp->fd_pname != fdp->fd_nname)) 133 free((void *)fdp->fd_pname); 134 if (fdp->fd_nname) 135 free((void *)fdp->fd_nname); 136 } 137 138 /* 139 * When $HWCAP is used to represent dependencies, take the associated directory 140 * and analyze all the files it contains. 141 */ 142 int 143 hwcap_dir(Alist **fdalpp, Lm_list *lml, const char *name, Rt_map *clmp, 144 uint_t flags, Rej_desc *rej) 145 { 146 char path[PATH_MAX], *dst; 147 const char *src; 148 DIR *dir; 149 struct dirent *dirent; 150 Aliste off; 151 Alist *fdalp = 0; 152 Fdesc *fdp; 153 int error = 0; 154 155 /* 156 * Access the directory in preparation for reading its entries. If 157 * successful, establish the initial pathname. 158 */ 159 if ((dir = opendir(name)) == 0) { 160 Rej_desc _rej = { 0 }; 161 162 _rej.rej_type = SGS_REJ_STR; 163 _rej.rej_name = name; 164 _rej.rej_str = strerror(errno); 165 DBG_CALL(Dbg_file_rejected(lml, &_rej)); 166 rejection_inherit(rej, &_rej, 0); 167 return (0); 168 } 169 170 for (dst = path, src = name; *src; dst++, src++) 171 *dst = *src; 172 *dst++ = '/'; 173 174 /* 175 * Read each entry from the directory and determine whether it is a 176 * valid ELF file. 177 */ 178 while ((dirent = readdir(dir)) != NULL) { 179 const char *file = dirent->d_name; 180 char *_dst; 181 Fdesc fdesc = { 0 }; 182 Rej_desc _rej = { 0 }; 183 184 /* 185 * Ignore "." and ".." entries. 186 */ 187 if ((file[0] == '.') && ((file[1] == '\0') || 188 ((file[1] == '.') && (file[2] == '\0')))) 189 continue; 190 191 /* 192 * Complete the full pathname, and verify its usability. 193 */ 194 for (_dst = dst, src = file, file = dst; *src; _dst++, src++) 195 *_dst = *src; 196 *_dst = '\0'; 197 198 if ((name = strdup(path)) == 0) { 199 error = 1; 200 break; 201 } 202 if ((name = load_trace(lml, name, clmp)) == 0) 203 continue; 204 205 if (find_path(lml, name, clmp, flags, &fdesc, &_rej) == 0) 206 rejection_inherit(rej, &_rej, &fdesc); 207 else { 208 DBG_CALL(Dbg_cap_hw_candidate(lml, name)); 209 210 /* 211 * If this object has already been loaded, obtain the 212 * hardware capabilities for later sorting. Otherwise 213 * we have a new candidate. 214 */ 215 if (fdesc.fd_lmp) 216 fdesc.fd_fmap.fm_hwptr = HWCAP(fdesc.fd_lmp); 217 else 218 fdesc.fd_fmap = *fmap; 219 220 if (alist_append(&fdalp, &fdesc, 221 sizeof (Fdesc), 10) == 0) { 222 remove_fdesc(&fdesc); 223 error = 1; 224 break; 225 } 226 } 227 228 /* 229 * Clear the global file mapping structure so that the mapping 230 * for this file won't be overriden. 231 */ 232 fmap->fm_mflags = MAP_PRIVATE; 233 fmap->fm_maddr = 0; 234 fmap->fm_msize = syspagsz; 235 fmap->fm_hwptr = 0; 236 237 } 238 (void) closedir(dir); 239 240 /* 241 * If no objects have been found, we're done. Also, if an allocation 242 * error occurred while processing any object, remove any objects that 243 * had already been added to the list and return. 244 */ 245 if ((fdalp == 0) || error) { 246 if (fdalp) { 247 for (ALIST_TRAVERSE(fdalp, off, fdp)) 248 remove_fdesc(fdp); 249 free(fdalp); 250 } 251 return (0); 252 } 253 254 /* 255 * Having processed and retained all candidates from this directory, 256 * sort them, based on the precedence of their hardware capabilities. 257 */ 258 qsort(&(fdalp->al_data[0]), ((fdalp->al_next - (sizeof (Alist) - 259 sizeof (void *))) / fdalp->al_size), fdalp->al_size, compare); 260 261 *fdalpp = fdalp; 262 return (1); 263 } 264 265 static Pnode * 266 _hwcap_filtees(Pnode **pnpp, Aliste nlmco, Lm_cntl *nlmc, Rt_map *flmp, 267 const char *ref, const char *dir, int mode, uint_t flags) 268 { 269 Alist *fdalp = 0; 270 Aliste off; 271 Pnode *fpnp = 0, *lpnp, *npnp = (*pnpp)->p_next; 272 Fdesc *fdp; 273 Lm_list *lml = LIST(flmp); 274 int unused = 0; 275 Rej_desc rej = { 0 }; 276 277 if (hwcap_dir(&fdalp, lml, dir, flmp, flags, &rej) == 0) { 278 remove_rej(&rej); 279 return (0); 280 } 281 282 /* 283 * Now complete the mapping of each of the ordered objects, adding 284 * each object to a new Pnode. 285 */ 286 for (ALIST_TRAVERSE(fdalp, off, fdp)) { 287 Rt_map *nlmp; 288 Grp_hdl *ghp = 0; 289 Pnode *pnp; 290 int audit = 0; 291 292 if (unused) { 293 /* 294 * Flush out objects remaining. 295 */ 296 remove_fdesc(fdp); 297 continue; 298 } 299 300 /* 301 * Complete mapping the file, obtaining a handle, and continue 302 * to analyze the object, establishing dependencies and 303 * relocating. Remove the file descriptor at this point, as it 304 * is no longer required. 305 */ 306 DBG_CALL(Dbg_file_filtee(lml, NAME(flmp), fdp->fd_nname, 0)); 307 308 nlmp = load_path(lml, nlmco, fdp->fd_nname, flmp, mode, 309 (flags | FLG_RT_HANDLE), &ghp, fdp, &rej); 310 remove_fdesc(fdp); 311 if (nlmp == 0) 312 continue; 313 314 /* 315 * Create a new Pnode to represent this filtee, and substitute 316 * the calling Pnode (which was used to represent the hardware 317 * capability directory). 318 */ 319 if ((pnp = calloc(1, sizeof (Pnode))) == 0) { 320 if (ghp) { 321 remove_lmc(lml, flmp, nlmc, nlmco, 322 fdp->fd_nname); 323 } 324 return (0); 325 } 326 if ((pnp->p_name = strdup(NAME(nlmp))) == 0) { 327 if (ghp) { 328 remove_lmc(lml, flmp, nlmc, nlmco, 329 fdp->fd_nname); 330 } 331 free(pnp); 332 return (0); 333 } 334 pnp->p_len = strlen(NAME(nlmp)); 335 pnp->p_info = (void *)ghp; 336 pnp->p_next = npnp; 337 338 if (fpnp == 0) { 339 Pnode *opnp = (*pnpp); 340 341 /* 342 * If this is the first pnode, reuse the original after 343 * freeing any of its pathnames. 344 */ 345 if (opnp->p_name) 346 free((void *)opnp->p_name); 347 if (opnp->p_oname) 348 free((void *)opnp->p_oname); 349 *opnp = *pnp; 350 free((void *)pnp); 351 fpnp = lpnp = pnp = opnp; 352 } else { 353 lpnp->p_next = pnp; 354 lpnp = pnp; 355 } 356 357 /* 358 * Establish the filter handle to prevent any recursion. 359 */ 360 if (nlmp && ghp) { 361 ghp->gh_flags |= GPH_FILTEE; 362 pnp->p_info = (void *)ghp; 363 } 364 365 /* 366 * Audit the filter/filtee established. A return of 0 367 * indicates the auditor wishes to ignore this filtee. 368 */ 369 if (nlmp && (lml->lm_tflags | FLAGS1(flmp)) & 370 LML_TFLG_AUD_OBJFILTER) { 371 if (audit_objfilter(flmp, ref, nlmp, 0) == 0) { 372 audit = 1; 373 nlmp = 0; 374 } 375 } 376 377 /* 378 * Finish processing the objects associated with this request. 379 */ 380 if (nlmp && ghp && ((analyze_lmc(lml, nlmco, nlmp) == 0) || 381 (relocate_lmc(lml, nlmco, flmp, nlmp) == 0))) 382 nlmp = 0; 383 384 /* 385 * If the filtee has been successfully processed, then create 386 * an association between the filter and the filtee. This 387 * association provides sufficient information to tear down the 388 * filter and filtee if necessary. 389 */ 390 DBG_CALL(Dbg_file_hdl_title(DBG_DEP_ADD)); 391 if (nlmp && ghp && (hdl_add(ghp, flmp, GPD_FILTER) == 0)) 392 nlmp = 0; 393 394 /* 395 * If this object is marked an end-filtee, we're done. 396 */ 397 if (nlmp && ghp && (FLAGS1(nlmp) & FL1_RT_ENDFILTE)) 398 unused = 1; 399 400 /* 401 * If this filtee loading has failed, generate a diagnostic. 402 * Null out the pnode entry, and continue the search. 403 */ 404 if (nlmp == 0) { 405 /* 406 * If attempting to load this filtee required a new 407 * link-map control list to which this request has 408 * added objects, then remove all the objects that 409 * have been associated to this request. 410 */ 411 if (nlmc && nlmc->lc_head) 412 remove_lmc(lml, flmp, nlmc, nlmco, pnp->p_name); 413 414 DBG_CALL(Dbg_file_filtee(lml, 0, pnp->p_name, audit)); 415 416 pnp->p_len = 0; 417 pnp->p_info = 0; 418 } 419 } 420 421 free(fdalp); 422 return (fpnp); 423 } 424 425 Pnode * 426 hwcap_filtees(Pnode **pnpp, Aliste nlmco, Lm_cntl *nlmc, Dyninfo *dip, 427 Rt_map *flmp, const char *ref, int mode, uint_t flags) 428 { 429 Pnode *pnp = *pnpp; 430 const char *dir = pnp->p_name; 431 Lm_list *flml = LIST(flmp); 432 433 DBG_CALL(Dbg_cap_hw_filter(flml, dir, flmp)); 434 435 if ((pnp = _hwcap_filtees(pnpp, nlmco, nlmc, flmp, ref, dir, mode, 436 flags)) != 0) 437 return (pnp); 438 439 /* 440 * If no hardware capability filtees have been found, provide suitable 441 * diagnostics and mark the incoming Pnode as unused. 442 */ 443 if ((flml->lm_flags & LML_FLG_TRC_ENABLE) && 444 (dip->di_flags & FLG_DI_AUXFLTR) && (rtld_flags & RT_FL_WARNFLTR)) 445 (void) printf(MSG_INTL(MSG_LDD_HWCAP_NFOUND), dir); 446 447 DBG_CALL(Dbg_cap_hw_filter(flml, dir, 0)); 448 449 pnp = *pnpp; 450 pnp->p_len = 0; 451 return (pnp); 452 } 453 454 /* 455 * Load an individual hardware capabilities object. 456 */ 457 Rt_map * 458 load_hwcap(Lm_list *lml, Aliste lmco, const char *dir, Rt_map *clmp, 459 uint_t mode, uint_t flags, Grp_hdl **hdl, Rej_desc *rej) 460 { 461 Alist *fdalp = 0; 462 Aliste off; 463 Fdesc *fdp; 464 int found = 0; 465 Rt_map *lmp = 0; 466 467 /* 468 * Obtain the sorted list of hardware capabilites objects available. 469 */ 470 if (hwcap_dir(&fdalp, lml, dir, clmp, flags, rej) == 0) 471 return (0); 472 473 /* 474 * From the list of hardware capability objects, use the first and 475 * discard the rest. 476 */ 477 for (ALIST_TRAVERSE(fdalp, off, fdp)) { 478 if ((found == 0) && ((lmp = load_path(lml, lmco, fdp->fd_nname, 479 clmp, mode, flags, hdl, fdp, rej)) != 0)) 480 found++; 481 482 /* 483 * Remove the used file descriptor and any objects remaining. 484 */ 485 remove_fdesc(fdp); 486 } 487 488 free(fdalp); 489 return (lmp); 490 } 491