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7127 remove -Wno-missing-braces from Makefile.uts
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--- old/usr/src/uts/common/exec/elf/elf.c
+++ new/usr/src/uts/common/exec/elf/elf.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
24 24 */
25 25
26 26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
27 27 /* All Rights Reserved */
28 28 /*
29 29 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
30 30 */
31 31
32 32 #include <sys/types.h>
33 33 #include <sys/param.h>
34 34 #include <sys/thread.h>
35 35 #include <sys/sysmacros.h>
36 36 #include <sys/signal.h>
37 37 #include <sys/cred.h>
38 38 #include <sys/user.h>
39 39 #include <sys/errno.h>
40 40 #include <sys/vnode.h>
41 41 #include <sys/mman.h>
42 42 #include <sys/kmem.h>
43 43 #include <sys/proc.h>
44 44 #include <sys/pathname.h>
45 45 #include <sys/cmn_err.h>
46 46 #include <sys/systm.h>
47 47 #include <sys/elf.h>
48 48 #include <sys/vmsystm.h>
49 49 #include <sys/debug.h>
50 50 #include <sys/auxv.h>
51 51 #include <sys/exec.h>
52 52 #include <sys/prsystm.h>
53 53 #include <vm/as.h>
54 54 #include <vm/rm.h>
55 55 #include <vm/seg.h>
56 56 #include <vm/seg_vn.h>
57 57 #include <sys/modctl.h>
58 58 #include <sys/systeminfo.h>
59 59 #include <sys/vmparam.h>
60 60 #include <sys/machelf.h>
61 61 #include <sys/shm_impl.h>
62 62 #include <sys/archsystm.h>
63 63 #include <sys/fasttrap.h>
64 64 #include <sys/brand.h>
65 65 #include "elf_impl.h"
66 66 #include <sys/sdt.h>
67 67 #include <sys/siginfo.h>
68 68
69 69 extern int at_flags;
70 70
71 71 #define ORIGIN_STR "ORIGIN"
72 72 #define ORIGIN_STR_SIZE 6
73 73
74 74 static int getelfhead(vnode_t *, cred_t *, Ehdr *, int *, int *, int *);
75 75 static int getelfphdr(vnode_t *, cred_t *, const Ehdr *, int, caddr_t *,
76 76 ssize_t *);
77 77 static int getelfshdr(vnode_t *, cred_t *, const Ehdr *, int, int, caddr_t *,
78 78 ssize_t *, caddr_t *, ssize_t *);
79 79 static size_t elfsize(Ehdr *, int, caddr_t, uintptr_t *);
80 80 static int mapelfexec(vnode_t *, Ehdr *, int, caddr_t,
81 81 Phdr **, Phdr **, Phdr **, Phdr **, Phdr *,
82 82 caddr_t *, caddr_t *, intptr_t *, intptr_t *, size_t, long *, size_t *);
83 83
84 84 typedef enum {
85 85 STR_CTF,
86 86 STR_SYMTAB,
87 87 STR_DYNSYM,
88 88 STR_STRTAB,
89 89 STR_DYNSTR,
90 90 STR_SHSTRTAB,
91 91 STR_NUM
92 92 } shstrtype_t;
93 93
94 94 static const char *shstrtab_data[] = {
95 95 ".SUNW_ctf",
96 96 ".symtab",
97 97 ".dynsym",
98 98 ".strtab",
99 99 ".dynstr",
100 100 ".shstrtab"
101 101 };
102 102
103 103 typedef struct shstrtab {
104 104 int sst_ndx[STR_NUM];
105 105 int sst_cur;
106 106 } shstrtab_t;
107 107
108 108 static void
109 109 shstrtab_init(shstrtab_t *s)
110 110 {
111 111 bzero(&s->sst_ndx, sizeof (s->sst_ndx));
112 112 s->sst_cur = 1;
113 113 }
114 114
115 115 static int
116 116 shstrtab_ndx(shstrtab_t *s, shstrtype_t type)
117 117 {
118 118 int ret;
119 119
120 120 if ((ret = s->sst_ndx[type]) != 0)
121 121 return (ret);
122 122
123 123 ret = s->sst_ndx[type] = s->sst_cur;
124 124 s->sst_cur += strlen(shstrtab_data[type]) + 1;
125 125
126 126 return (ret);
127 127 }
128 128
129 129 static size_t
130 130 shstrtab_size(const shstrtab_t *s)
131 131 {
132 132 return (s->sst_cur);
133 133 }
134 134
135 135 static void
136 136 shstrtab_dump(const shstrtab_t *s, char *buf)
137 137 {
138 138 int i, ndx;
139 139
140 140 *buf = '\0';
141 141 for (i = 0; i < STR_NUM; i++) {
142 142 if ((ndx = s->sst_ndx[i]) != 0)
143 143 (void) strcpy(buf + ndx, shstrtab_data[i]);
144 144 }
145 145 }
146 146
147 147 static int
148 148 dtrace_safe_phdr(Phdr *phdrp, struct uarg *args, uintptr_t base)
149 149 {
150 150 ASSERT(phdrp->p_type == PT_SUNWDTRACE);
151 151
152 152 /*
153 153 * See the comment in fasttrap.h for information on how to safely
154 154 * update this program header.
155 155 */
156 156 if (phdrp->p_memsz < PT_SUNWDTRACE_SIZE ||
157 157 (phdrp->p_flags & (PF_R | PF_W | PF_X)) != (PF_R | PF_W | PF_X))
158 158 return (-1);
159 159
160 160 args->thrptr = phdrp->p_vaddr + base;
161 161
162 162 return (0);
163 163 }
164 164
165 165 /*
166 166 * Map in the executable pointed to by vp. Returns 0 on success.
167 167 */
168 168 int
169 169 mapexec_brand(vnode_t *vp, uarg_t *args, Ehdr *ehdr, Addr *uphdr_vaddr,
170 170 intptr_t *voffset, caddr_t exec_file, int *interp, caddr_t *bssbase,
171 171 caddr_t *brkbase, size_t *brksize, uintptr_t *lddatap)
172 172 {
173 173 size_t len;
174 174 struct vattr vat;
175 175 caddr_t phdrbase = NULL;
176 176 ssize_t phdrsize;
177 177 int nshdrs, shstrndx, nphdrs;
178 178 int error = 0;
179 179 Phdr *uphdr = NULL;
180 180 Phdr *junk = NULL;
181 181 Phdr *dynphdr = NULL;
182 182 Phdr *dtrphdr = NULL;
183 183 uintptr_t lddata;
184 184 long execsz;
185 185 intptr_t minaddr;
186 186
187 187 if (lddatap != NULL)
188 188 *lddatap = NULL;
189 189
190 190 if (error = execpermissions(vp, &vat, args)) {
191 191 uprintf("%s: Cannot execute %s\n", exec_file, args->pathname);
192 192 return (error);
193 193 }
194 194
195 195 if ((error = getelfhead(vp, CRED(), ehdr, &nshdrs, &shstrndx,
196 196 &nphdrs)) != 0 ||
197 197 (error = getelfphdr(vp, CRED(), ehdr, nphdrs, &phdrbase,
198 198 &phdrsize)) != 0) {
199 199 uprintf("%s: Cannot read %s\n", exec_file, args->pathname);
200 200 return (error);
201 201 }
202 202
203 203 if ((len = elfsize(ehdr, nphdrs, phdrbase, &lddata)) == 0) {
204 204 uprintf("%s: Nothing to load in %s", exec_file, args->pathname);
205 205 kmem_free(phdrbase, phdrsize);
206 206 return (ENOEXEC);
207 207 }
208 208 if (lddatap != NULL)
209 209 *lddatap = lddata;
210 210
211 211 if (error = mapelfexec(vp, ehdr, nphdrs, phdrbase, &uphdr, &dynphdr,
212 212 &junk, &dtrphdr, NULL, bssbase, brkbase, voffset, &minaddr,
213 213 len, &execsz, brksize)) {
214 214 uprintf("%s: Cannot map %s\n", exec_file, args->pathname);
215 215 kmem_free(phdrbase, phdrsize);
216 216 return (error);
217 217 }
218 218
219 219 /*
220 220 * Inform our caller if the executable needs an interpreter.
221 221 */
222 222 *interp = (dynphdr == NULL) ? 0 : 1;
223 223
224 224 /*
225 225 * If this is a statically linked executable, voffset should indicate
226 226 * the address of the executable itself (it normally holds the address
227 227 * of the interpreter).
228 228 */
229 229 if (ehdr->e_type == ET_EXEC && *interp == 0)
230 230 *voffset = minaddr;
231 231
232 232 if (uphdr != NULL) {
233 233 *uphdr_vaddr = uphdr->p_vaddr;
234 234 } else {
235 235 *uphdr_vaddr = (Addr)-1;
236 236 }
237 237
238 238 kmem_free(phdrbase, phdrsize);
239 239 return (error);
240 240 }
241 241
242 242 /*ARGSUSED*/
243 243 int
244 244 elfexec(vnode_t *vp, execa_t *uap, uarg_t *args, intpdata_t *idatap,
245 245 int level, long *execsz, int setid, caddr_t exec_file, cred_t *cred,
246 246 int brand_action)
247 247 {
248 248 caddr_t phdrbase = NULL;
249 249 caddr_t bssbase = 0;
250 250 caddr_t brkbase = 0;
251 251 size_t brksize = 0;
252 252 ssize_t dlnsize;
253 253 aux_entry_t *aux;
254 254 int error;
255 255 ssize_t resid;
256 256 int fd = -1;
257 257 intptr_t voffset;
258 258 Phdr *dyphdr = NULL;
259 259 Phdr *stphdr = NULL;
260 260 Phdr *uphdr = NULL;
261 261 Phdr *junk = NULL;
262 262 size_t len;
263 263 ssize_t phdrsize;
264 264 int postfixsize = 0;
265 265 int i, hsize;
266 266 Phdr *phdrp;
267 267 Phdr *dataphdrp = NULL;
268 268 Phdr *dtrphdr;
269 269 Phdr *capphdr = NULL;
270 270 Cap *cap = NULL;
271 271 ssize_t capsize;
272 272 int hasu = 0;
273 273 int hasauxv = 0;
274 274 int hasdy = 0;
275 275 int branded = 0;
276 276
277 277 struct proc *p = ttoproc(curthread);
278 278 struct user *up = PTOU(p);
279 279 struct bigwad {
280 280 Ehdr ehdr;
281 281 aux_entry_t elfargs[__KERN_NAUXV_IMPL];
282 282 char dl_name[MAXPATHLEN];
283 283 char pathbuf[MAXPATHLEN];
284 284 struct vattr vattr;
285 285 struct execenv exenv;
286 286 } *bigwad; /* kmem_alloc this behemoth so we don't blow stack */
287 287 Ehdr *ehdrp;
288 288 int nshdrs, shstrndx, nphdrs;
289 289 char *dlnp;
290 290 char *pathbufp;
291 291 rlim64_t limit;
292 292 rlim64_t roundlimit;
293 293
294 294 ASSERT(p->p_model == DATAMODEL_ILP32 || p->p_model == DATAMODEL_LP64);
295 295
296 296 bigwad = kmem_alloc(sizeof (struct bigwad), KM_SLEEP);
297 297 ehdrp = &bigwad->ehdr;
298 298 dlnp = bigwad->dl_name;
299 299 pathbufp = bigwad->pathbuf;
300 300
301 301 /*
302 302 * Obtain ELF and program header information.
303 303 */
304 304 if ((error = getelfhead(vp, CRED(), ehdrp, &nshdrs, &shstrndx,
305 305 &nphdrs)) != 0 ||
306 306 (error = getelfphdr(vp, CRED(), ehdrp, nphdrs, &phdrbase,
307 307 &phdrsize)) != 0)
308 308 goto out;
309 309
310 310 /*
311 311 * Prevent executing an ELF file that has no entry point.
312 312 */
313 313 if (ehdrp->e_entry == 0) {
314 314 uprintf("%s: Bad entry point\n", exec_file);
315 315 goto bad;
316 316 }
317 317
318 318 /*
319 319 * Put data model that we're exec-ing to into the args passed to
320 320 * exec_args(), so it will know what it is copying to on new stack.
321 321 * Now that we know whether we are exec-ing a 32-bit or 64-bit
322 322 * executable, we can set execsz with the appropriate NCARGS.
323 323 */
324 324 #ifdef _LP64
325 325 if (ehdrp->e_ident[EI_CLASS] == ELFCLASS32) {
326 326 args->to_model = DATAMODEL_ILP32;
327 327 *execsz = btopr(SINCR) + btopr(SSIZE) + btopr(NCARGS32-1);
328 328 } else {
329 329 args->to_model = DATAMODEL_LP64;
330 330 args->stk_prot &= ~PROT_EXEC;
331 331 #if defined(__i386) || defined(__amd64)
332 332 args->dat_prot &= ~PROT_EXEC;
333 333 #endif
334 334 *execsz = btopr(SINCR) + btopr(SSIZE) + btopr(NCARGS64-1);
335 335 }
336 336 #else /* _LP64 */
337 337 args->to_model = DATAMODEL_ILP32;
338 338 *execsz = btopr(SINCR) + btopr(SSIZE) + btopr(NCARGS-1);
339 339 #endif /* _LP64 */
340 340
341 341 /*
342 342 * We delay invoking the brand callback until we've figured out
343 343 * what kind of elf binary we're trying to run, 32-bit or 64-bit.
344 344 * We do this because now the brand library can just check
345 345 * args->to_model to see if the target is 32-bit or 64-bit without
346 346 * having do duplicate all the code above.
347 347 *
348 348 * The level checks associated with brand handling below are used to
349 349 * prevent a loop since the brand elfexec function typically comes back
350 350 * through this function. We must check <= here since the nested
351 351 * handling in the #! interpreter code will increment the level before
352 352 * calling gexec to run the final elfexec interpreter.
353 353 */
354 354 if ((level <= INTP_MAXDEPTH) &&
355 355 (brand_action != EBA_NATIVE) && (PROC_IS_BRANDED(p))) {
356 356 error = BROP(p)->b_elfexec(vp, uap, args,
357 357 idatap, level + 1, execsz, setid, exec_file, cred,
358 358 brand_action);
359 359 goto out;
360 360 }
361 361
362 362 /*
363 363 * Determine aux size now so that stack can be built
364 364 * in one shot (except actual copyout of aux image),
365 365 * determine any non-default stack protections,
366 366 * and still have this code be machine independent.
367 367 */
368 368 hsize = ehdrp->e_phentsize;
369 369 phdrp = (Phdr *)phdrbase;
370 370 for (i = nphdrs; i > 0; i--) {
371 371 switch (phdrp->p_type) {
372 372 case PT_INTERP:
373 373 hasauxv = hasdy = 1;
374 374 break;
375 375 case PT_PHDR:
376 376 hasu = 1;
377 377 break;
378 378 case PT_SUNWSTACK:
379 379 args->stk_prot = PROT_USER;
380 380 if (phdrp->p_flags & PF_R)
381 381 args->stk_prot |= PROT_READ;
382 382 if (phdrp->p_flags & PF_W)
383 383 args->stk_prot |= PROT_WRITE;
384 384 if (phdrp->p_flags & PF_X)
385 385 args->stk_prot |= PROT_EXEC;
386 386 break;
387 387 case PT_LOAD:
388 388 dataphdrp = phdrp;
389 389 break;
390 390 case PT_SUNWCAP:
391 391 capphdr = phdrp;
392 392 break;
393 393 }
394 394 phdrp = (Phdr *)((caddr_t)phdrp + hsize);
395 395 }
396 396
397 397 if (ehdrp->e_type != ET_EXEC) {
398 398 dataphdrp = NULL;
399 399 hasauxv = 1;
400 400 }
401 401
402 402 /* Copy BSS permissions to args->dat_prot */
403 403 if (dataphdrp != NULL) {
404 404 args->dat_prot = PROT_USER;
405 405 if (dataphdrp->p_flags & PF_R)
406 406 args->dat_prot |= PROT_READ;
407 407 if (dataphdrp->p_flags & PF_W)
408 408 args->dat_prot |= PROT_WRITE;
409 409 if (dataphdrp->p_flags & PF_X)
410 410 args->dat_prot |= PROT_EXEC;
411 411 }
412 412
413 413 /*
414 414 * If a auxvector will be required - reserve the space for
415 415 * it now. This may be increased by exec_args if there are
416 416 * ISA-specific types (included in __KERN_NAUXV_IMPL).
417 417 */
418 418 if (hasauxv) {
419 419 /*
420 420 * If a AUX vector is being built - the base AUX
421 421 * entries are:
422 422 *
423 423 * AT_BASE
424 424 * AT_FLAGS
425 425 * AT_PAGESZ
426 426 * AT_SUN_AUXFLAGS
427 427 * AT_SUN_HWCAP
428 428 * AT_SUN_HWCAP2
429 429 * AT_SUN_PLATFORM (added in stk_copyout)
430 430 * AT_SUN_EXECNAME (added in stk_copyout)
431 431 * AT_NULL
432 432 *
433 433 * total == 9
434 434 */
435 435 if (hasdy && hasu) {
436 436 /*
437 437 * Has PT_INTERP & PT_PHDR - the auxvectors that
438 438 * will be built are:
439 439 *
440 440 * AT_PHDR
441 441 * AT_PHENT
442 442 * AT_PHNUM
443 443 * AT_ENTRY
444 444 * AT_LDDATA
445 445 *
446 446 * total = 5
447 447 */
448 448 args->auxsize = (9 + 5) * sizeof (aux_entry_t);
449 449 } else if (hasdy) {
450 450 /*
451 451 * Has PT_INTERP but no PT_PHDR
452 452 *
453 453 * AT_EXECFD
454 454 * AT_LDDATA
455 455 *
456 456 * total = 2
457 457 */
458 458 args->auxsize = (9 + 2) * sizeof (aux_entry_t);
459 459 } else {
460 460 args->auxsize = 9 * sizeof (aux_entry_t);
461 461 }
462 462 } else {
463 463 args->auxsize = 0;
464 464 }
465 465
466 466 /*
467 467 * If this binary is using an emulator, we need to add an
468 468 * AT_SUN_EMULATOR aux entry.
469 469 */
470 470 if (args->emulator != NULL)
471 471 args->auxsize += sizeof (aux_entry_t);
472 472
473 473 if ((brand_action != EBA_NATIVE) && (PROC_IS_BRANDED(p))) {
474 474 branded = 1;
475 475 /*
476 476 * We will be adding 4 entries to the aux vectors. One for
477 477 * the the brandname and 3 for the brand specific aux vectors.
478 478 */
479 479 args->auxsize += 4 * sizeof (aux_entry_t);
480 480 }
481 481
482 482 /* Hardware/Software capabilities */
483 483 if (capphdr != NULL &&
484 484 (capsize = capphdr->p_filesz) > 0 &&
485 485 capsize <= 16 * sizeof (*cap)) {
486 486 int ncaps = capsize / sizeof (*cap);
487 487 Cap *cp;
488 488
489 489 cap = kmem_alloc(capsize, KM_SLEEP);
490 490 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)cap,
491 491 capsize, (offset_t)capphdr->p_offset,
492 492 UIO_SYSSPACE, 0, (rlim64_t)0, CRED(), &resid)) != 0) {
493 493 uprintf("%s: Cannot read capabilities section\n",
494 494 exec_file);
495 495 goto out;
496 496 }
497 497 for (cp = cap; cp < cap + ncaps; cp++) {
498 498 if (cp->c_tag == CA_SUNW_SF_1 &&
499 499 (cp->c_un.c_val & SF1_SUNW_ADDR32)) {
500 500 if (args->to_model == DATAMODEL_LP64)
501 501 args->addr32 = 1;
502 502 break;
503 503 }
504 504 }
505 505 }
506 506
507 507 aux = bigwad->elfargs;
508 508 /*
509 509 * Move args to the user's stack.
510 510 * This can fill in the AT_SUN_PLATFORM and AT_SUN_EXECNAME aux entries.
511 511 */
512 512 if ((error = exec_args(uap, args, idatap, (void **)&aux)) != 0) {
513 513 if (error == -1) {
514 514 error = ENOEXEC;
515 515 goto bad;
516 516 }
517 517 goto out;
518 518 }
519 519 /* we're single threaded after this point */
520 520
521 521 /*
522 522 * If this is an ET_DYN executable (shared object),
523 523 * determine its memory size so that mapelfexec() can load it.
524 524 */
525 525 if (ehdrp->e_type == ET_DYN)
526 526 len = elfsize(ehdrp, nphdrs, phdrbase, NULL);
527 527 else
528 528 len = 0;
529 529
530 530 dtrphdr = NULL;
531 531
532 532 if ((error = mapelfexec(vp, ehdrp, nphdrs, phdrbase, &uphdr, &dyphdr,
533 533 &stphdr, &dtrphdr, dataphdrp, &bssbase, &brkbase, &voffset, NULL,
534 534 len, execsz, &brksize)) != 0)
535 535 goto bad;
536 536
537 537 if (uphdr != NULL && dyphdr == NULL)
538 538 goto bad;
539 539
540 540 if (dtrphdr != NULL && dtrace_safe_phdr(dtrphdr, args, voffset) != 0) {
541 541 uprintf("%s: Bad DTrace phdr in %s\n", exec_file, exec_file);
542 542 goto bad;
543 543 }
544 544
545 545 if (dyphdr != NULL) {
546 546 size_t len;
547 547 uintptr_t lddata;
548 548 char *p;
549 549 struct vnode *nvp;
550 550
551 551 dlnsize = dyphdr->p_filesz;
552 552
553 553 if (dlnsize > MAXPATHLEN || dlnsize <= 0)
554 554 goto bad;
555 555
556 556 /*
557 557 * Read in "interpreter" pathname.
558 558 */
559 559 if ((error = vn_rdwr(UIO_READ, vp, dlnp, dyphdr->p_filesz,
560 560 (offset_t)dyphdr->p_offset, UIO_SYSSPACE, 0, (rlim64_t)0,
561 561 CRED(), &resid)) != 0) {
562 562 uprintf("%s: Cannot obtain interpreter pathname\n",
563 563 exec_file);
564 564 goto bad;
565 565 }
566 566
567 567 if (resid != 0 || dlnp[dlnsize - 1] != '\0')
568 568 goto bad;
569 569
570 570 /*
571 571 * Search for '$ORIGIN' token in interpreter path.
572 572 * If found, expand it.
573 573 */
574 574 for (p = dlnp; p = strchr(p, '$'); ) {
575 575 uint_t len, curlen;
576 576 char *_ptr;
577 577
578 578 if (strncmp(++p, ORIGIN_STR, ORIGIN_STR_SIZE))
579 579 continue;
580 580
581 581 /*
582 582 * We don't support $ORIGIN on setid programs to close
583 583 * a potential attack vector.
584 584 */
585 585 if ((setid & EXECSETID_SETID) != 0) {
586 586 error = ENOEXEC;
587 587 goto bad;
588 588 }
589 589
590 590 curlen = 0;
591 591 len = p - dlnp - 1;
592 592 if (len) {
593 593 bcopy(dlnp, pathbufp, len);
594 594 curlen += len;
595 595 }
596 596 if (_ptr = strrchr(args->pathname, '/')) {
597 597 len = _ptr - args->pathname;
598 598 if ((curlen + len) > MAXPATHLEN)
599 599 break;
600 600
601 601 bcopy(args->pathname, &pathbufp[curlen], len);
602 602 curlen += len;
603 603 } else {
604 604 /*
605 605 * executable is a basename found in the
606 606 * current directory. So - just substitue
607 607 * '.' for ORIGIN.
608 608 */
609 609 pathbufp[curlen] = '.';
610 610 curlen++;
611 611 }
612 612 p += ORIGIN_STR_SIZE;
613 613 len = strlen(p);
614 614
615 615 if ((curlen + len) > MAXPATHLEN)
616 616 break;
617 617 bcopy(p, &pathbufp[curlen], len);
618 618 curlen += len;
619 619 pathbufp[curlen++] = '\0';
620 620 bcopy(pathbufp, dlnp, curlen);
621 621 }
622 622
623 623 /*
624 624 * /usr/lib/ld.so.1 is known to be a symlink to /lib/ld.so.1
625 625 * (and /usr/lib/64/ld.so.1 is a symlink to /lib/64/ld.so.1).
626 626 * Just in case /usr is not mounted, change it now.
627 627 */
628 628 if (strcmp(dlnp, USR_LIB_RTLD) == 0)
629 629 dlnp += 4;
630 630 error = lookupname(dlnp, UIO_SYSSPACE, FOLLOW, NULLVPP, &nvp);
631 631 if (error && dlnp != bigwad->dl_name) {
632 632 /* new kernel, old user-level */
633 633 error = lookupname(dlnp -= 4, UIO_SYSSPACE, FOLLOW,
634 634 NULLVPP, &nvp);
635 635 }
636 636 if (error) {
637 637 uprintf("%s: Cannot find %s\n", exec_file, dlnp);
638 638 goto bad;
639 639 }
640 640
641 641 /*
642 642 * Setup the "aux" vector.
643 643 */
644 644 if (uphdr) {
645 645 if (ehdrp->e_type == ET_DYN) {
646 646 /* don't use the first page */
647 647 bigwad->exenv.ex_brkbase = (caddr_t)PAGESIZE;
648 648 bigwad->exenv.ex_bssbase = (caddr_t)PAGESIZE;
649 649 } else {
650 650 bigwad->exenv.ex_bssbase = bssbase;
651 651 bigwad->exenv.ex_brkbase = brkbase;
652 652 }
653 653 bigwad->exenv.ex_brksize = brksize;
654 654 bigwad->exenv.ex_magic = elfmagic;
655 655 bigwad->exenv.ex_vp = vp;
656 656 setexecenv(&bigwad->exenv);
657 657
658 658 ADDAUX(aux, AT_PHDR, uphdr->p_vaddr + voffset)
659 659 ADDAUX(aux, AT_PHENT, ehdrp->e_phentsize)
660 660 ADDAUX(aux, AT_PHNUM, nphdrs)
661 661 ADDAUX(aux, AT_ENTRY, ehdrp->e_entry + voffset)
662 662 } else {
663 663 if ((error = execopen(&vp, &fd)) != 0) {
664 664 VN_RELE(nvp);
665 665 goto bad;
666 666 }
667 667
668 668 ADDAUX(aux, AT_EXECFD, fd)
669 669 }
670 670
671 671 if ((error = execpermissions(nvp, &bigwad->vattr, args)) != 0) {
672 672 VN_RELE(nvp);
673 673 uprintf("%s: Cannot execute %s\n", exec_file, dlnp);
674 674 goto bad;
675 675 }
676 676
677 677 /*
678 678 * Now obtain the ELF header along with the entire program
679 679 * header contained in "nvp".
680 680 */
681 681 kmem_free(phdrbase, phdrsize);
682 682 phdrbase = NULL;
683 683 if ((error = getelfhead(nvp, CRED(), ehdrp, &nshdrs,
684 684 &shstrndx, &nphdrs)) != 0 ||
685 685 (error = getelfphdr(nvp, CRED(), ehdrp, nphdrs, &phdrbase,
686 686 &phdrsize)) != 0) {
687 687 VN_RELE(nvp);
688 688 uprintf("%s: Cannot read %s\n", exec_file, dlnp);
689 689 goto bad;
690 690 }
691 691
692 692 /*
693 693 * Determine memory size of the "interpreter's" loadable
694 694 * sections. This size is then used to obtain the virtual
695 695 * address of a hole, in the user's address space, large
696 696 * enough to map the "interpreter".
697 697 */
698 698 if ((len = elfsize(ehdrp, nphdrs, phdrbase, &lddata)) == 0) {
699 699 VN_RELE(nvp);
700 700 uprintf("%s: Nothing to load in %s\n", exec_file, dlnp);
701 701 goto bad;
702 702 }
703 703
704 704 dtrphdr = NULL;
705 705
706 706 error = mapelfexec(nvp, ehdrp, nphdrs, phdrbase, &junk, &junk,
707 707 &junk, &dtrphdr, NULL, NULL, NULL, &voffset, NULL, len,
708 708 execsz, NULL);
709 709 if (error || junk != NULL) {
710 710 VN_RELE(nvp);
711 711 uprintf("%s: Cannot map %s\n", exec_file, dlnp);
712 712 goto bad;
713 713 }
714 714
715 715 /*
716 716 * We use the DTrace program header to initialize the
717 717 * architecture-specific user per-LWP location. The dtrace
718 718 * fasttrap provider requires ready access to per-LWP scratch
719 719 * space. We assume that there is only one such program header
720 720 * in the interpreter.
721 721 */
722 722 if (dtrphdr != NULL &&
723 723 dtrace_safe_phdr(dtrphdr, args, voffset) != 0) {
724 724 VN_RELE(nvp);
725 725 uprintf("%s: Bad DTrace phdr in %s\n", exec_file, dlnp);
726 726 goto bad;
727 727 }
728 728
729 729 VN_RELE(nvp);
730 730 ADDAUX(aux, AT_SUN_LDDATA, voffset + lddata)
731 731 }
732 732
733 733 if (hasauxv) {
734 734 int auxf = AF_SUN_HWCAPVERIFY;
735 735 /*
736 736 * Note: AT_SUN_PLATFORM and AT_SUN_EXECNAME were filled in via
737 737 * exec_args()
738 738 */
739 739 ADDAUX(aux, AT_BASE, voffset)
740 740 ADDAUX(aux, AT_FLAGS, at_flags)
741 741 ADDAUX(aux, AT_PAGESZ, PAGESIZE)
742 742 /*
743 743 * Linker flags. (security)
744 744 * p_flag not yet set at this time.
745 745 * We rely on gexec() to provide us with the information.
746 746 * If the application is set-uid but this is not reflected
747 747 * in a mismatch between real/effective uids/gids, then
748 748 * don't treat this as a set-uid exec. So we care about
749 749 * the EXECSETID_UGIDS flag but not the ...SETID flag.
750 750 */
751 751 if ((setid &= ~EXECSETID_SETID) != 0)
752 752 auxf |= AF_SUN_SETUGID;
753 753
754 754 /*
755 755 * If we're running a native process from within a branded
756 756 * zone under pfexec then we clear the AF_SUN_SETUGID flag so
757 757 * that the native ld.so.1 is able to link with the native
758 758 * libraries instead of using the brand libraries that are
759 759 * installed in the zone. We only do this for processes
760 760 * which we trust because we see they are already running
761 761 * under pfexec (where uid != euid). This prevents a
762 762 * malicious user within the zone from crafting a wrapper to
763 763 * run native suid commands with unsecure libraries interposed.
764 764 */
765 765 if ((brand_action == EBA_NATIVE) && (PROC_IS_BRANDED(p) &&
766 766 (setid &= ~EXECSETID_SETID) != 0))
767 767 auxf &= ~AF_SUN_SETUGID;
768 768
769 769 /*
770 770 * Record the user addr of the auxflags aux vector entry
771 771 * since brands may optionally want to manipulate this field.
772 772 */
773 773 args->auxp_auxflags =
774 774 (char *)((char *)args->stackend +
775 775 ((char *)&aux->a_type -
776 776 (char *)bigwad->elfargs));
777 777 ADDAUX(aux, AT_SUN_AUXFLAGS, auxf);
778 778 /*
779 779 * Hardware capability flag word (performance hints)
780 780 * Used for choosing faster library routines.
781 781 * (Potentially different between 32-bit and 64-bit ABIs)
782 782 */
783 783 #if defined(_LP64)
784 784 if (args->to_model == DATAMODEL_NATIVE) {
785 785 ADDAUX(aux, AT_SUN_HWCAP, auxv_hwcap)
786 786 ADDAUX(aux, AT_SUN_HWCAP2, auxv_hwcap_2)
787 787 } else {
788 788 ADDAUX(aux, AT_SUN_HWCAP, auxv_hwcap32)
789 789 ADDAUX(aux, AT_SUN_HWCAP2, auxv_hwcap32_2)
790 790 }
791 791 #else
792 792 ADDAUX(aux, AT_SUN_HWCAP, auxv_hwcap)
793 793 ADDAUX(aux, AT_SUN_HWCAP2, auxv_hwcap_2)
794 794 #endif
795 795 if (branded) {
796 796 /*
797 797 * Reserve space for the brand-private aux vectors,
798 798 * and record the user addr of that space.
799 799 */
800 800 args->auxp_brand =
801 801 (char *)((char *)args->stackend +
802 802 ((char *)&aux->a_type -
803 803 (char *)bigwad->elfargs));
804 804 ADDAUX(aux, AT_SUN_BRAND_AUX1, 0)
805 805 ADDAUX(aux, AT_SUN_BRAND_AUX2, 0)
806 806 ADDAUX(aux, AT_SUN_BRAND_AUX3, 0)
807 807 }
808 808
809 809 ADDAUX(aux, AT_NULL, 0)
810 810 postfixsize = (char *)aux - (char *)bigwad->elfargs;
811 811
812 812 /*
813 813 * We make assumptions above when we determine how many aux
814 814 * vector entries we will be adding. However, if we have an
815 815 * invalid elf file, it is possible that mapelfexec might
816 816 * behave differently (but not return an error), in which case
817 817 * the number of aux entries we actually add will be different.
818 818 * We detect that now and error out.
819 819 */
820 820 if (postfixsize != args->auxsize) {
821 821 DTRACE_PROBE2(elfexec_badaux, int, postfixsize,
822 822 int, args->auxsize);
823 823 goto bad;
824 824 }
825 825 ASSERT(postfixsize <= __KERN_NAUXV_IMPL * sizeof (aux_entry_t));
826 826 }
827 827
828 828 /*
829 829 * For the 64-bit kernel, the limit is big enough that rounding it up
830 830 * to a page can overflow the 64-bit limit, so we check for btopr()
831 831 * overflowing here by comparing it with the unrounded limit in pages.
832 832 * If it hasn't overflowed, compare the exec size with the rounded up
833 833 * limit in pages. Otherwise, just compare with the unrounded limit.
834 834 */
835 835 limit = btop(p->p_vmem_ctl);
836 836 roundlimit = btopr(p->p_vmem_ctl);
837 837 if ((roundlimit > limit && *execsz > roundlimit) ||
838 838 (roundlimit < limit && *execsz > limit)) {
839 839 mutex_enter(&p->p_lock);
840 840 (void) rctl_action(rctlproc_legacy[RLIMIT_VMEM], p->p_rctls, p,
841 841 RCA_SAFE);
842 842 mutex_exit(&p->p_lock);
843 843 error = ENOMEM;
844 844 goto bad;
845 845 }
846 846
847 847 bzero(up->u_auxv, sizeof (up->u_auxv));
848 848 if (postfixsize) {
849 849 int num_auxv;
850 850
851 851 /*
852 852 * Copy the aux vector to the user stack.
853 853 */
854 854 error = execpoststack(args, bigwad->elfargs, postfixsize);
855 855 if (error)
856 856 goto bad;
857 857
858 858 /*
859 859 * Copy auxv to the process's user structure for use by /proc.
860 860 * If this is a branded process, the brand's exec routine will
861 861 * copy it's private entries to the user structure later. It
862 862 * relies on the fact that the blank entries are at the end.
863 863 */
864 864 num_auxv = postfixsize / sizeof (aux_entry_t);
865 865 ASSERT(num_auxv <= sizeof (up->u_auxv) / sizeof (auxv_t));
866 866 aux = bigwad->elfargs;
867 867 for (i = 0; i < num_auxv; i++) {
868 868 up->u_auxv[i].a_type = aux[i].a_type;
869 869 up->u_auxv[i].a_un.a_val = (aux_val_t)aux[i].a_un.a_val;
870 870 }
871 871 }
872 872
873 873 /*
874 874 * Pass back the starting address so we can set the program counter.
875 875 */
876 876 args->entry = (uintptr_t)(ehdrp->e_entry + voffset);
877 877
878 878 if (!uphdr) {
879 879 if (ehdrp->e_type == ET_DYN) {
880 880 /*
881 881 * If we are executing a shared library which doesn't
882 882 * have a interpreter (probably ld.so.1) then
883 883 * we don't set the brkbase now. Instead we
884 884 * delay it's setting until the first call
885 885 * via grow.c::brk(). This permits ld.so.1 to
886 886 * initialize brkbase to the tail of the executable it
887 887 * loads (which is where it needs to be).
888 888 */
889 889 bigwad->exenv.ex_brkbase = (caddr_t)0;
890 890 bigwad->exenv.ex_bssbase = (caddr_t)0;
891 891 bigwad->exenv.ex_brksize = 0;
892 892 } else {
893 893 bigwad->exenv.ex_brkbase = brkbase;
894 894 bigwad->exenv.ex_bssbase = bssbase;
895 895 bigwad->exenv.ex_brksize = brksize;
896 896 }
897 897 bigwad->exenv.ex_magic = elfmagic;
898 898 bigwad->exenv.ex_vp = vp;
899 899 setexecenv(&bigwad->exenv);
900 900 }
901 901
902 902 ASSERT(error == 0);
903 903 goto out;
904 904
905 905 bad:
906 906 if (fd != -1) /* did we open the a.out yet */
907 907 (void) execclose(fd);
908 908
909 909 psignal(p, SIGKILL);
910 910
911 911 if (error == 0)
912 912 error = ENOEXEC;
913 913 out:
914 914 if (phdrbase != NULL)
915 915 kmem_free(phdrbase, phdrsize);
916 916 if (cap != NULL)
917 917 kmem_free(cap, capsize);
918 918 kmem_free(bigwad, sizeof (struct bigwad));
919 919 return (error);
920 920 }
921 921
922 922 /*
923 923 * Compute the memory size requirement for the ELF file.
924 924 */
925 925 static size_t
926 926 elfsize(Ehdr *ehdrp, int nphdrs, caddr_t phdrbase, uintptr_t *lddata)
927 927 {
928 928 size_t len;
929 929 Phdr *phdrp = (Phdr *)phdrbase;
930 930 int hsize = ehdrp->e_phentsize;
931 931 int first = 1;
932 932 int dfirst = 1; /* first data segment */
933 933 uintptr_t loaddr = 0;
934 934 uintptr_t hiaddr = 0;
935 935 uintptr_t lo, hi;
936 936 int i;
937 937
938 938 for (i = nphdrs; i > 0; i--) {
939 939 if (phdrp->p_type == PT_LOAD) {
940 940 lo = phdrp->p_vaddr;
941 941 hi = lo + phdrp->p_memsz;
942 942 if (first) {
943 943 loaddr = lo;
944 944 hiaddr = hi;
945 945 first = 0;
946 946 } else {
947 947 if (loaddr > lo)
948 948 loaddr = lo;
949 949 if (hiaddr < hi)
950 950 hiaddr = hi;
951 951 }
952 952
953 953 /*
954 954 * save the address of the first data segment
955 955 * of a object - used for the AT_SUNW_LDDATA
956 956 * aux entry.
957 957 */
958 958 if ((lddata != NULL) && dfirst &&
959 959 (phdrp->p_flags & PF_W)) {
960 960 *lddata = lo;
961 961 dfirst = 0;
962 962 }
963 963 }
964 964 phdrp = (Phdr *)((caddr_t)phdrp + hsize);
965 965 }
966 966
967 967 len = hiaddr - (loaddr & PAGEMASK);
968 968 len = roundup(len, PAGESIZE);
969 969
970 970 return (len);
971 971 }
972 972
973 973 /*
974 974 * Read in the ELF header and program header table.
975 975 * SUSV3 requires:
976 976 * ENOEXEC File format is not recognized
977 977 * EINVAL Format recognized but execution not supported
978 978 */
979 979 static int
980 980 getelfhead(vnode_t *vp, cred_t *credp, Ehdr *ehdr, int *nshdrs, int *shstrndx,
981 981 int *nphdrs)
982 982 {
983 983 int error;
984 984 ssize_t resid;
985 985
986 986 /*
987 987 * We got here by the first two bytes in ident,
988 988 * now read the entire ELF header.
989 989 */
990 990 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)ehdr,
991 991 sizeof (Ehdr), (offset_t)0, UIO_SYSSPACE, 0,
992 992 (rlim64_t)0, credp, &resid)) != 0)
993 993 return (error);
994 994
995 995 /*
996 996 * Since a separate version is compiled for handling 32-bit and
997 997 * 64-bit ELF executables on a 64-bit kernel, the 64-bit version
998 998 * doesn't need to be able to deal with 32-bit ELF files.
999 999 */
1000 1000 if (resid != 0 ||
1001 1001 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
1002 1002 ehdr->e_ident[EI_MAG3] != ELFMAG3)
1003 1003 return (ENOEXEC);
1004 1004
1005 1005 if ((ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) ||
1006 1006 #if defined(_ILP32) || defined(_ELF32_COMPAT)
1007 1007 ehdr->e_ident[EI_CLASS] != ELFCLASS32 ||
1008 1008 #else
1009 1009 ehdr->e_ident[EI_CLASS] != ELFCLASS64 ||
1010 1010 #endif
1011 1011 !elfheadcheck(ehdr->e_ident[EI_DATA], ehdr->e_machine,
1012 1012 ehdr->e_flags))
1013 1013 return (EINVAL);
1014 1014
1015 1015 *nshdrs = ehdr->e_shnum;
1016 1016 *shstrndx = ehdr->e_shstrndx;
1017 1017 *nphdrs = ehdr->e_phnum;
1018 1018
1019 1019 /*
1020 1020 * If e_shnum, e_shstrndx, or e_phnum is its sentinel value, we need
1021 1021 * to read in the section header at index zero to acces the true
1022 1022 * values for those fields.
1023 1023 */
1024 1024 if ((*nshdrs == 0 && ehdr->e_shoff != 0) ||
1025 1025 *shstrndx == SHN_XINDEX || *nphdrs == PN_XNUM) {
1026 1026 Shdr shdr;
1027 1027
1028 1028 if (ehdr->e_shoff == 0)
1029 1029 return (EINVAL);
1030 1030
1031 1031 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)&shdr,
1032 1032 sizeof (shdr), (offset_t)ehdr->e_shoff, UIO_SYSSPACE, 0,
1033 1033 (rlim64_t)0, credp, &resid)) != 0)
1034 1034 return (error);
1035 1035
1036 1036 if (*nshdrs == 0)
1037 1037 *nshdrs = shdr.sh_size;
1038 1038 if (*shstrndx == SHN_XINDEX)
1039 1039 *shstrndx = shdr.sh_link;
1040 1040 if (*nphdrs == PN_XNUM && shdr.sh_info != 0)
1041 1041 *nphdrs = shdr.sh_info;
1042 1042 }
1043 1043
1044 1044 return (0);
1045 1045 }
1046 1046
1047 1047 #ifdef _ELF32_COMPAT
1048 1048 extern size_t elf_nphdr_max;
1049 1049 #else
1050 1050 size_t elf_nphdr_max = 1000;
1051 1051 #endif
1052 1052
1053 1053 static int
1054 1054 getelfphdr(vnode_t *vp, cred_t *credp, const Ehdr *ehdr, int nphdrs,
1055 1055 caddr_t *phbasep, ssize_t *phsizep)
1056 1056 {
1057 1057 ssize_t resid, minsize;
1058 1058 int err;
1059 1059
1060 1060 /*
1061 1061 * Since we're going to be using e_phentsize to iterate down the
1062 1062 * array of program headers, it must be 8-byte aligned or else
1063 1063 * a we might cause a misaligned access. We use all members through
1064 1064 * p_flags on 32-bit ELF files and p_memsz on 64-bit ELF files so
1065 1065 * e_phentsize must be at least large enough to include those
1066 1066 * members.
1067 1067 */
1068 1068 #if !defined(_LP64) || defined(_ELF32_COMPAT)
1069 1069 minsize = offsetof(Phdr, p_flags) + sizeof (((Phdr *)NULL)->p_flags);
1070 1070 #else
1071 1071 minsize = offsetof(Phdr, p_memsz) + sizeof (((Phdr *)NULL)->p_memsz);
1072 1072 #endif
1073 1073 if (ehdr->e_phentsize < minsize || (ehdr->e_phentsize & 3))
1074 1074 return (EINVAL);
1075 1075
1076 1076 *phsizep = nphdrs * ehdr->e_phentsize;
1077 1077
1078 1078 if (*phsizep > sizeof (Phdr) * elf_nphdr_max) {
1079 1079 if ((*phbasep = kmem_alloc(*phsizep, KM_NOSLEEP)) == NULL)
1080 1080 return (ENOMEM);
1081 1081 } else {
1082 1082 *phbasep = kmem_alloc(*phsizep, KM_SLEEP);
1083 1083 }
1084 1084
1085 1085 if ((err = vn_rdwr(UIO_READ, vp, *phbasep, *phsizep,
1086 1086 (offset_t)ehdr->e_phoff, UIO_SYSSPACE, 0, (rlim64_t)0,
1087 1087 credp, &resid)) != 0) {
1088 1088 kmem_free(*phbasep, *phsizep);
1089 1089 *phbasep = NULL;
1090 1090 return (err);
1091 1091 }
1092 1092
1093 1093 return (0);
1094 1094 }
1095 1095
1096 1096 #ifdef _ELF32_COMPAT
1097 1097 extern size_t elf_nshdr_max;
1098 1098 extern size_t elf_shstrtab_max;
1099 1099 #else
1100 1100 size_t elf_nshdr_max = 10000;
1101 1101 size_t elf_shstrtab_max = 100 * 1024;
1102 1102 #endif
1103 1103
1104 1104
1105 1105 static int
1106 1106 getelfshdr(vnode_t *vp, cred_t *credp, const Ehdr *ehdr,
1107 1107 int nshdrs, int shstrndx, caddr_t *shbasep, ssize_t *shsizep,
1108 1108 char **shstrbasep, ssize_t *shstrsizep)
1109 1109 {
1110 1110 ssize_t resid, minsize;
1111 1111 int err;
1112 1112 Shdr *shdr;
1113 1113
1114 1114 /*
1115 1115 * Since we're going to be using e_shentsize to iterate down the
1116 1116 * array of section headers, it must be 8-byte aligned or else
1117 1117 * a we might cause a misaligned access. We use all members through
1118 1118 * sh_entsize (on both 32- and 64-bit ELF files) so e_shentsize
1119 1119 * must be at least large enough to include that member. The index
1120 1120 * of the string table section must also be valid.
1121 1121 */
1122 1122 minsize = offsetof(Shdr, sh_entsize) + sizeof (shdr->sh_entsize);
1123 1123 if (ehdr->e_shentsize < minsize || (ehdr->e_shentsize & 3) ||
1124 1124 shstrndx >= nshdrs)
1125 1125 return (EINVAL);
1126 1126
1127 1127 *shsizep = nshdrs * ehdr->e_shentsize;
1128 1128
1129 1129 if (*shsizep > sizeof (Shdr) * elf_nshdr_max) {
1130 1130 if ((*shbasep = kmem_alloc(*shsizep, KM_NOSLEEP)) == NULL)
1131 1131 return (ENOMEM);
1132 1132 } else {
1133 1133 *shbasep = kmem_alloc(*shsizep, KM_SLEEP);
1134 1134 }
1135 1135
1136 1136 if ((err = vn_rdwr(UIO_READ, vp, *shbasep, *shsizep,
1137 1137 (offset_t)ehdr->e_shoff, UIO_SYSSPACE, 0, (rlim64_t)0,
1138 1138 credp, &resid)) != 0) {
1139 1139 kmem_free(*shbasep, *shsizep);
1140 1140 return (err);
1141 1141 }
1142 1142
1143 1143 /*
1144 1144 * Pull the section string table out of the vnode; fail if the size
1145 1145 * is zero.
1146 1146 */
1147 1147 shdr = (Shdr *)(*shbasep + shstrndx * ehdr->e_shentsize);
1148 1148 if ((*shstrsizep = shdr->sh_size) == 0) {
1149 1149 kmem_free(*shbasep, *shsizep);
1150 1150 return (EINVAL);
1151 1151 }
1152 1152
1153 1153 if (*shstrsizep > elf_shstrtab_max) {
1154 1154 if ((*shstrbasep = kmem_alloc(*shstrsizep,
1155 1155 KM_NOSLEEP)) == NULL) {
1156 1156 kmem_free(*shbasep, *shsizep);
1157 1157 return (ENOMEM);
1158 1158 }
1159 1159 } else {
1160 1160 *shstrbasep = kmem_alloc(*shstrsizep, KM_SLEEP);
1161 1161 }
1162 1162
1163 1163 if ((err = vn_rdwr(UIO_READ, vp, *shstrbasep, *shstrsizep,
1164 1164 (offset_t)shdr->sh_offset, UIO_SYSSPACE, 0, (rlim64_t)0,
1165 1165 credp, &resid)) != 0) {
1166 1166 kmem_free(*shbasep, *shsizep);
1167 1167 kmem_free(*shstrbasep, *shstrsizep);
1168 1168 return (err);
1169 1169 }
1170 1170
1171 1171 /*
1172 1172 * Make sure the strtab is null-terminated to make sure we
1173 1173 * don't run off the end of the table.
1174 1174 */
1175 1175 (*shstrbasep)[*shstrsizep - 1] = '\0';
1176 1176
1177 1177 return (0);
1178 1178 }
1179 1179
1180 1180 static int
1181 1181 mapelfexec(
1182 1182 vnode_t *vp,
1183 1183 Ehdr *ehdr,
1184 1184 int nphdrs,
1185 1185 caddr_t phdrbase,
1186 1186 Phdr **uphdr,
1187 1187 Phdr **dyphdr,
1188 1188 Phdr **stphdr,
1189 1189 Phdr **dtphdr,
1190 1190 Phdr *dataphdrp,
1191 1191 caddr_t *bssbase,
1192 1192 caddr_t *brkbase,
1193 1193 intptr_t *voffset,
1194 1194 intptr_t *minaddr,
1195 1195 size_t len,
1196 1196 long *execsz,
1197 1197 size_t *brksize)
1198 1198 {
1199 1199 Phdr *phdr;
1200 1200 int i, prot, error;
1201 1201 caddr_t addr = NULL;
1202 1202 size_t zfodsz;
1203 1203 int ptload = 0;
1204 1204 int page;
1205 1205 off_t offset;
1206 1206 int hsize = ehdr->e_phentsize;
1207 1207 caddr_t mintmp = (caddr_t)-1;
1208 1208 extern int use_brk_lpg;
1209 1209
1210 1210 if (ehdr->e_type == ET_DYN) {
1211 1211 /*
1212 1212 * Obtain the virtual address of a hole in the
1213 1213 * address space to map the "interpreter".
1214 1214 */
1215 1215 map_addr(&addr, len, (offset_t)0, 1, 0);
1216 1216 if (addr == NULL)
1217 1217 return (ENOMEM);
1218 1218 *voffset = (intptr_t)addr;
1219 1219
1220 1220 /*
1221 1221 * Calculate the minimum vaddr so it can be subtracted out.
1222 1222 * According to the ELF specification, since PT_LOAD sections
1223 1223 * must be sorted by increasing p_vaddr values, this is
1224 1224 * guaranteed to be the first PT_LOAD section.
1225 1225 */
1226 1226 phdr = (Phdr *)phdrbase;
1227 1227 for (i = nphdrs; i > 0; i--) {
1228 1228 if (phdr->p_type == PT_LOAD) {
1229 1229 *voffset -= (uintptr_t)phdr->p_vaddr;
1230 1230 break;
1231 1231 }
1232 1232 phdr = (Phdr *)((caddr_t)phdr + hsize);
1233 1233 }
1234 1234
1235 1235 } else {
1236 1236 *voffset = 0;
1237 1237 }
1238 1238 phdr = (Phdr *)phdrbase;
1239 1239 for (i = nphdrs; i > 0; i--) {
1240 1240 switch (phdr->p_type) {
1241 1241 case PT_LOAD:
1242 1242 if ((*dyphdr != NULL) && (*uphdr == NULL))
1243 1243 return (0);
1244 1244
1245 1245 ptload = 1;
1246 1246 prot = PROT_USER;
1247 1247 if (phdr->p_flags & PF_R)
1248 1248 prot |= PROT_READ;
1249 1249 if (phdr->p_flags & PF_W)
1250 1250 prot |= PROT_WRITE;
1251 1251 if (phdr->p_flags & PF_X)
1252 1252 prot |= PROT_EXEC;
1253 1253
1254 1254 addr = (caddr_t)((uintptr_t)phdr->p_vaddr + *voffset);
1255 1255
1256 1256 /*
1257 1257 * Keep track of the segment with the lowest starting
1258 1258 * address.
1259 1259 */
1260 1260 if (addr < mintmp)
1261 1261 mintmp = addr;
1262 1262
1263 1263 zfodsz = (size_t)phdr->p_memsz - phdr->p_filesz;
1264 1264
1265 1265 offset = phdr->p_offset;
1266 1266 if (((uintptr_t)offset & PAGEOFFSET) ==
1267 1267 ((uintptr_t)addr & PAGEOFFSET) &&
1268 1268 (!(vp->v_flag & VNOMAP))) {
1269 1269 page = 1;
1270 1270 } else {
1271 1271 page = 0;
1272 1272 }
1273 1273
1274 1274 /*
1275 1275 * Set the heap pagesize for OOB when the bss size
1276 1276 * is known and use_brk_lpg is not 0.
1277 1277 */
1278 1278 if (brksize != NULL && use_brk_lpg &&
1279 1279 zfodsz != 0 && phdr == dataphdrp &&
1280 1280 (prot & PROT_WRITE)) {
1281 1281 size_t tlen = P2NPHASE((uintptr_t)addr +
1282 1282 phdr->p_filesz, PAGESIZE);
1283 1283
1284 1284 if (zfodsz > tlen) {
1285 1285 curproc->p_brkpageszc =
1286 1286 page_szc(map_pgsz(MAPPGSZ_HEAP,
1287 1287 curproc, addr + phdr->p_filesz +
1288 1288 tlen, zfodsz - tlen, 0));
1289 1289 }
1290 1290 }
1291 1291
1292 1292 if (curproc->p_brkpageszc != 0 && phdr == dataphdrp &&
1293 1293 (prot & PROT_WRITE)) {
1294 1294 uint_t szc = curproc->p_brkpageszc;
1295 1295 size_t pgsz = page_get_pagesize(szc);
1296 1296 caddr_t ebss = addr + phdr->p_memsz;
1297 1297 size_t extra_zfodsz;
1298 1298
1299 1299 ASSERT(pgsz > PAGESIZE);
1300 1300
1301 1301 extra_zfodsz = P2NPHASE((uintptr_t)ebss, pgsz);
1302 1302
1303 1303 if (error = execmap(vp, addr, phdr->p_filesz,
1304 1304 zfodsz + extra_zfodsz, phdr->p_offset,
1305 1305 prot, page, szc))
1306 1306 goto bad;
1307 1307 if (brksize != NULL)
1308 1308 *brksize = extra_zfodsz;
1309 1309 } else {
1310 1310 if (error = execmap(vp, addr, phdr->p_filesz,
1311 1311 zfodsz, phdr->p_offset, prot, page, 0))
1312 1312 goto bad;
1313 1313 }
1314 1314
1315 1315 if (bssbase != NULL && addr >= *bssbase &&
1316 1316 phdr == dataphdrp) {
1317 1317 *bssbase = addr + phdr->p_filesz;
1318 1318 }
1319 1319 if (brkbase != NULL && addr >= *brkbase) {
1320 1320 *brkbase = addr + phdr->p_memsz;
1321 1321 }
1322 1322
1323 1323 *execsz += btopr(phdr->p_memsz);
1324 1324 break;
1325 1325
1326 1326 case PT_INTERP:
1327 1327 if (ptload)
1328 1328 goto bad;
1329 1329 *dyphdr = phdr;
1330 1330 break;
1331 1331
1332 1332 case PT_SHLIB:
1333 1333 *stphdr = phdr;
1334 1334 break;
1335 1335
1336 1336 case PT_PHDR:
1337 1337 if (ptload)
1338 1338 goto bad;
1339 1339 *uphdr = phdr;
1340 1340 break;
1341 1341
1342 1342 case PT_NULL:
1343 1343 case PT_DYNAMIC:
1344 1344 case PT_NOTE:
1345 1345 break;
1346 1346
1347 1347 case PT_SUNWDTRACE:
1348 1348 if (dtphdr != NULL)
1349 1349 *dtphdr = phdr;
1350 1350 break;
1351 1351
1352 1352 default:
1353 1353 break;
1354 1354 }
1355 1355 phdr = (Phdr *)((caddr_t)phdr + hsize);
1356 1356 }
1357 1357
1358 1358 if (minaddr != NULL) {
1359 1359 ASSERT(mintmp != (caddr_t)-1);
1360 1360 *minaddr = (intptr_t)mintmp;
1361 1361 }
1362 1362
1363 1363 return (0);
1364 1364 bad:
1365 1365 if (error == 0)
1366 1366 error = EINVAL;
1367 1367 return (error);
1368 1368 }
1369 1369
1370 1370 int
1371 1371 elfnote(vnode_t *vp, offset_t *offsetp, int type, int descsz, void *desc,
1372 1372 rlim64_t rlimit, cred_t *credp)
1373 1373 {
1374 1374 Note note;
1375 1375 int error;
1376 1376
1377 1377 bzero(¬e, sizeof (note));
1378 1378 bcopy("CORE", note.name, 4);
1379 1379 note.nhdr.n_type = type;
1380 1380 /*
1381 1381 * The System V ABI states that n_namesz must be the length of the
1382 1382 * string that follows the Nhdr structure including the terminating
1383 1383 * null. The ABI also specifies that sufficient padding should be
1384 1384 * included so that the description that follows the name string
1385 1385 * begins on a 4- or 8-byte boundary for 32- and 64-bit binaries
1386 1386 * respectively. However, since this change was not made correctly
1387 1387 * at the time of the 64-bit port, both 32- and 64-bit binaries
1388 1388 * descriptions are only guaranteed to begin on a 4-byte boundary.
1389 1389 */
1390 1390 note.nhdr.n_namesz = 5;
1391 1391 note.nhdr.n_descsz = roundup(descsz, sizeof (Word));
1392 1392
1393 1393 if (error = core_write(vp, UIO_SYSSPACE, *offsetp, ¬e,
1394 1394 sizeof (note), rlimit, credp))
1395 1395 return (error);
1396 1396
1397 1397 *offsetp += sizeof (note);
1398 1398
1399 1399 if (error = core_write(vp, UIO_SYSSPACE, *offsetp, desc,
1400 1400 note.nhdr.n_descsz, rlimit, credp))
1401 1401 return (error);
1402 1402
1403 1403 *offsetp += note.nhdr.n_descsz;
1404 1404 return (0);
1405 1405 }
1406 1406
1407 1407 /*
1408 1408 * Copy the section data from one vnode to the section of another vnode.
1409 1409 */
1410 1410 static void
1411 1411 copy_scn(Shdr *src, vnode_t *src_vp, Shdr *dst, vnode_t *dst_vp, Off *doffset,
1412 1412 void *buf, size_t size, cred_t *credp, rlim64_t rlimit)
1413 1413 {
1414 1414 ssize_t resid;
1415 1415 size_t len, n = src->sh_size;
1416 1416 offset_t off = 0;
1417 1417
1418 1418 while (n != 0) {
1419 1419 len = MIN(size, n);
1420 1420 if (vn_rdwr(UIO_READ, src_vp, buf, len, src->sh_offset + off,
1421 1421 UIO_SYSSPACE, 0, (rlim64_t)0, credp, &resid) != 0 ||
1422 1422 resid >= len ||
1423 1423 core_write(dst_vp, UIO_SYSSPACE, *doffset + off,
1424 1424 buf, len - resid, rlimit, credp) != 0) {
1425 1425 dst->sh_size = 0;
1426 1426 dst->sh_offset = 0;
1427 1427 return;
1428 1428 }
1429 1429
1430 1430 ASSERT(n >= len - resid);
1431 1431
1432 1432 n -= len - resid;
1433 1433 off += len - resid;
1434 1434 }
1435 1435
1436 1436 *doffset += src->sh_size;
1437 1437 }
1438 1438
1439 1439 #ifdef _ELF32_COMPAT
1440 1440 extern size_t elf_datasz_max;
1441 1441 #else
1442 1442 size_t elf_datasz_max = 1 * 1024 * 1024;
1443 1443 #endif
1444 1444
1445 1445 /*
1446 1446 * This function processes mappings that correspond to load objects to
1447 1447 * examine their respective sections for elfcore(). It's called once with
1448 1448 * v set to NULL to count the number of sections that we're going to need
1449 1449 * and then again with v set to some allocated buffer that we fill in with
1450 1450 * all the section data.
1451 1451 */
1452 1452 static int
1453 1453 process_scns(core_content_t content, proc_t *p, cred_t *credp, vnode_t *vp,
1454 1454 Shdr *v, int nv, rlim64_t rlimit, Off *doffsetp, int *nshdrsp)
1455 1455 {
1456 1456 vnode_t *lastvp = NULL;
1457 1457 struct seg *seg;
1458 1458 int i, j;
1459 1459 void *data = NULL;
1460 1460 size_t datasz = 0;
1461 1461 shstrtab_t shstrtab;
1462 1462 struct as *as = p->p_as;
1463 1463 int error = 0;
1464 1464
1465 1465 if (v != NULL)
1466 1466 shstrtab_init(&shstrtab);
1467 1467
1468 1468 i = 1;
1469 1469 for (seg = AS_SEGFIRST(as); seg != NULL; seg = AS_SEGNEXT(as, seg)) {
1470 1470 uint_t prot;
1471 1471 vnode_t *mvp;
1472 1472 void *tmp = NULL;
1473 1473 caddr_t saddr = seg->s_base;
1474 1474 caddr_t naddr;
1475 1475 caddr_t eaddr;
1476 1476 size_t segsize;
1477 1477
1478 1478 Ehdr ehdr;
1479 1479 int nshdrs, shstrndx, nphdrs;
1480 1480 caddr_t shbase;
1481 1481 ssize_t shsize;
1482 1482 char *shstrbase;
1483 1483 ssize_t shstrsize;
1484 1484
1485 1485 Shdr *shdr;
1486 1486 const char *name;
1487 1487 size_t sz;
1488 1488 uintptr_t off;
1489 1489
1490 1490 int ctf_ndx = 0;
1491 1491 int symtab_ndx = 0;
1492 1492
1493 1493 /*
1494 1494 * Since we're just looking for text segments of load
1495 1495 * objects, we only care about the protection bits; we don't
1496 1496 * care about the actual size of the segment so we use the
1497 1497 * reserved size. If the segment's size is zero, there's
1498 1498 * something fishy going on so we ignore this segment.
1499 1499 */
1500 1500 if (seg->s_ops != &segvn_ops ||
1501 1501 SEGOP_GETVP(seg, seg->s_base, &mvp) != 0 ||
1502 1502 mvp == lastvp || mvp == NULL || mvp->v_type != VREG ||
1503 1503 (segsize = pr_getsegsize(seg, 1)) == 0)
1504 1504 continue;
1505 1505
1506 1506 eaddr = saddr + segsize;
1507 1507 prot = pr_getprot(seg, 1, &tmp, &saddr, &naddr, eaddr);
1508 1508 pr_getprot_done(&tmp);
1509 1509
1510 1510 /*
1511 1511 * Skip this segment unless the protection bits look like
1512 1512 * what we'd expect for a text segment.
1513 1513 */
1514 1514 if ((prot & (PROT_WRITE | PROT_EXEC)) != PROT_EXEC)
1515 1515 continue;
1516 1516
1517 1517 if (getelfhead(mvp, credp, &ehdr, &nshdrs, &shstrndx,
1518 1518 &nphdrs) != 0 ||
1519 1519 getelfshdr(mvp, credp, &ehdr, nshdrs, shstrndx,
1520 1520 &shbase, &shsize, &shstrbase, &shstrsize) != 0)
1521 1521 continue;
1522 1522
1523 1523 off = ehdr.e_shentsize;
1524 1524 for (j = 1; j < nshdrs; j++, off += ehdr.e_shentsize) {
1525 1525 Shdr *symtab = NULL, *strtab;
1526 1526
1527 1527 shdr = (Shdr *)(shbase + off);
1528 1528
1529 1529 if (shdr->sh_name >= shstrsize)
1530 1530 continue;
1531 1531
1532 1532 name = shstrbase + shdr->sh_name;
1533 1533
1534 1534 if (strcmp(name, shstrtab_data[STR_CTF]) == 0) {
1535 1535 if ((content & CC_CONTENT_CTF) == 0 ||
1536 1536 ctf_ndx != 0)
1537 1537 continue;
1538 1538
1539 1539 if (shdr->sh_link > 0 &&
1540 1540 shdr->sh_link < nshdrs) {
1541 1541 symtab = (Shdr *)(shbase +
1542 1542 shdr->sh_link * ehdr.e_shentsize);
1543 1543 }
1544 1544
1545 1545 if (v != NULL && i < nv - 1) {
1546 1546 if (shdr->sh_size > datasz &&
1547 1547 shdr->sh_size <= elf_datasz_max) {
1548 1548 if (data != NULL)
1549 1549 kmem_free(data, datasz);
1550 1550
1551 1551 datasz = shdr->sh_size;
1552 1552 data = kmem_alloc(datasz,
1553 1553 KM_SLEEP);
1554 1554 }
1555 1555
1556 1556 v[i].sh_name = shstrtab_ndx(&shstrtab,
1557 1557 STR_CTF);
1558 1558 v[i].sh_addr = (Addr)(uintptr_t)saddr;
1559 1559 v[i].sh_type = SHT_PROGBITS;
1560 1560 v[i].sh_addralign = 4;
1561 1561 *doffsetp = roundup(*doffsetp,
1562 1562 v[i].sh_addralign);
1563 1563 v[i].sh_offset = *doffsetp;
1564 1564 v[i].sh_size = shdr->sh_size;
1565 1565 if (symtab == NULL) {
1566 1566 v[i].sh_link = 0;
1567 1567 } else if (symtab->sh_type ==
1568 1568 SHT_SYMTAB &&
1569 1569 symtab_ndx != 0) {
1570 1570 v[i].sh_link =
1571 1571 symtab_ndx;
1572 1572 } else {
1573 1573 v[i].sh_link = i + 1;
1574 1574 }
1575 1575
1576 1576 copy_scn(shdr, mvp, &v[i], vp,
1577 1577 doffsetp, data, datasz, credp,
1578 1578 rlimit);
1579 1579 }
1580 1580
1581 1581 ctf_ndx = i++;
1582 1582
1583 1583 /*
1584 1584 * We've already dumped the symtab.
1585 1585 */
1586 1586 if (symtab != NULL &&
1587 1587 symtab->sh_type == SHT_SYMTAB &&
1588 1588 symtab_ndx != 0)
1589 1589 continue;
1590 1590
1591 1591 } else if (strcmp(name,
1592 1592 shstrtab_data[STR_SYMTAB]) == 0) {
1593 1593 if ((content & CC_CONTENT_SYMTAB) == 0 ||
1594 1594 symtab != 0)
1595 1595 continue;
1596 1596
1597 1597 symtab = shdr;
1598 1598 }
1599 1599
1600 1600 if (symtab != NULL) {
1601 1601 if ((symtab->sh_type != SHT_DYNSYM &&
1602 1602 symtab->sh_type != SHT_SYMTAB) ||
1603 1603 symtab->sh_link == 0 ||
1604 1604 symtab->sh_link >= nshdrs)
1605 1605 continue;
1606 1606
1607 1607 strtab = (Shdr *)(shbase +
1608 1608 symtab->sh_link * ehdr.e_shentsize);
1609 1609
1610 1610 if (strtab->sh_type != SHT_STRTAB)
1611 1611 continue;
1612 1612
1613 1613 if (v != NULL && i < nv - 2) {
1614 1614 sz = MAX(symtab->sh_size,
1615 1615 strtab->sh_size);
1616 1616 if (sz > datasz &&
1617 1617 sz <= elf_datasz_max) {
1618 1618 if (data != NULL)
1619 1619 kmem_free(data, datasz);
1620 1620
1621 1621 datasz = sz;
1622 1622 data = kmem_alloc(datasz,
1623 1623 KM_SLEEP);
1624 1624 }
1625 1625
1626 1626 if (symtab->sh_type == SHT_DYNSYM) {
1627 1627 v[i].sh_name = shstrtab_ndx(
1628 1628 &shstrtab, STR_DYNSYM);
1629 1629 v[i + 1].sh_name = shstrtab_ndx(
1630 1630 &shstrtab, STR_DYNSTR);
1631 1631 } else {
1632 1632 v[i].sh_name = shstrtab_ndx(
1633 1633 &shstrtab, STR_SYMTAB);
1634 1634 v[i + 1].sh_name = shstrtab_ndx(
1635 1635 &shstrtab, STR_STRTAB);
1636 1636 }
1637 1637
1638 1638 v[i].sh_type = symtab->sh_type;
1639 1639 v[i].sh_addr = symtab->sh_addr;
1640 1640 if (ehdr.e_type == ET_DYN ||
1641 1641 v[i].sh_addr == 0)
1642 1642 v[i].sh_addr +=
1643 1643 (Addr)(uintptr_t)saddr;
1644 1644 v[i].sh_addralign =
1645 1645 symtab->sh_addralign;
1646 1646 *doffsetp = roundup(*doffsetp,
1647 1647 v[i].sh_addralign);
1648 1648 v[i].sh_offset = *doffsetp;
1649 1649 v[i].sh_size = symtab->sh_size;
1650 1650 v[i].sh_link = i + 1;
1651 1651 v[i].sh_entsize = symtab->sh_entsize;
1652 1652 v[i].sh_info = symtab->sh_info;
1653 1653
1654 1654 copy_scn(symtab, mvp, &v[i], vp,
1655 1655 doffsetp, data, datasz, credp,
1656 1656 rlimit);
1657 1657
1658 1658 v[i + 1].sh_type = SHT_STRTAB;
1659 1659 v[i + 1].sh_flags = SHF_STRINGS;
1660 1660 v[i + 1].sh_addr = symtab->sh_addr;
1661 1661 if (ehdr.e_type == ET_DYN ||
1662 1662 v[i + 1].sh_addr == 0)
1663 1663 v[i + 1].sh_addr +=
1664 1664 (Addr)(uintptr_t)saddr;
1665 1665 v[i + 1].sh_addralign =
1666 1666 strtab->sh_addralign;
1667 1667 *doffsetp = roundup(*doffsetp,
1668 1668 v[i + 1].sh_addralign);
1669 1669 v[i + 1].sh_offset = *doffsetp;
1670 1670 v[i + 1].sh_size = strtab->sh_size;
1671 1671
1672 1672 copy_scn(strtab, mvp, &v[i + 1], vp,
1673 1673 doffsetp, data, datasz, credp,
1674 1674 rlimit);
1675 1675 }
1676 1676
1677 1677 if (symtab->sh_type == SHT_SYMTAB)
1678 1678 symtab_ndx = i;
1679 1679 i += 2;
1680 1680 }
1681 1681 }
1682 1682
1683 1683 kmem_free(shstrbase, shstrsize);
1684 1684 kmem_free(shbase, shsize);
1685 1685
1686 1686 lastvp = mvp;
1687 1687 }
1688 1688
1689 1689 if (v == NULL) {
1690 1690 if (i == 1)
1691 1691 *nshdrsp = 0;
1692 1692 else
1693 1693 *nshdrsp = i + 1;
1694 1694 goto done;
1695 1695 }
1696 1696
1697 1697 if (i != nv - 1) {
1698 1698 cmn_err(CE_WARN, "elfcore: core dump failed for "
1699 1699 "process %d; address space is changing", p->p_pid);
1700 1700 error = EIO;
1701 1701 goto done;
1702 1702 }
1703 1703
1704 1704 v[i].sh_name = shstrtab_ndx(&shstrtab, STR_SHSTRTAB);
1705 1705 v[i].sh_size = shstrtab_size(&shstrtab);
1706 1706 v[i].sh_addralign = 1;
1707 1707 *doffsetp = roundup(*doffsetp, v[i].sh_addralign);
1708 1708 v[i].sh_offset = *doffsetp;
1709 1709 v[i].sh_flags = SHF_STRINGS;
1710 1710 v[i].sh_type = SHT_STRTAB;
1711 1711
1712 1712 if (v[i].sh_size > datasz) {
1713 1713 if (data != NULL)
1714 1714 kmem_free(data, datasz);
1715 1715
1716 1716 datasz = v[i].sh_size;
1717 1717 data = kmem_alloc(datasz,
1718 1718 KM_SLEEP);
1719 1719 }
1720 1720
1721 1721 shstrtab_dump(&shstrtab, data);
1722 1722
1723 1723 if ((error = core_write(vp, UIO_SYSSPACE, *doffsetp,
1724 1724 data, v[i].sh_size, rlimit, credp)) != 0)
1725 1725 goto done;
1726 1726
1727 1727 *doffsetp += v[i].sh_size;
1728 1728
1729 1729 done:
1730 1730 if (data != NULL)
1731 1731 kmem_free(data, datasz);
1732 1732
1733 1733 return (error);
1734 1734 }
1735 1735
1736 1736 int
1737 1737 elfcore(vnode_t *vp, proc_t *p, cred_t *credp, rlim64_t rlimit, int sig,
1738 1738 core_content_t content)
1739 1739 {
1740 1740 offset_t poffset, soffset;
1741 1741 Off doffset;
1742 1742 int error, i, nphdrs, nshdrs;
1743 1743 int overflow = 0;
1744 1744 struct seg *seg;
1745 1745 struct as *as = p->p_as;
1746 1746 union {
1747 1747 Ehdr ehdr;
1748 1748 Phdr phdr[1];
1749 1749 Shdr shdr[1];
1750 1750 } *bigwad;
1751 1751 size_t bigsize;
1752 1752 size_t phdrsz, shdrsz;
1753 1753 Ehdr *ehdr;
1754 1754 Phdr *v;
1755 1755 caddr_t brkbase;
1756 1756 size_t brksize;
1757 1757 caddr_t stkbase;
1758 1758 size_t stksize;
1759 1759 int ntries = 0;
1760 1760 klwp_t *lwp = ttolwp(curthread);
1761 1761
1762 1762 top:
1763 1763 /*
1764 1764 * Make sure we have everything we need (registers, etc.).
1765 1765 * All other lwps have already stopped and are in an orderly state.
1766 1766 */
1767 1767 ASSERT(p == ttoproc(curthread));
1768 1768 prstop(0, 0);
1769 1769
1770 1770 AS_LOCK_ENTER(as, RW_WRITER);
1771 1771 nphdrs = prnsegs(as, 0) + 2; /* two CORE note sections */
1772 1772
1773 1773 /*
1774 1774 * Count the number of section headers we're going to need.
1775 1775 */
1776 1776 nshdrs = 0;
1777 1777 if (content & (CC_CONTENT_CTF | CC_CONTENT_SYMTAB)) {
1778 1778 (void) process_scns(content, p, credp, NULL, NULL, NULL, 0,
1779 1779 NULL, &nshdrs);
1780 1780 }
1781 1781 AS_LOCK_EXIT(as);
1782 1782
1783 1783 ASSERT(nshdrs == 0 || nshdrs > 1);
1784 1784
1785 1785 /*
1786 1786 * The core file contents may required zero section headers, but if
1787 1787 * we overflow the 16 bits allotted to the program header count in
1788 1788 * the ELF header, we'll need that program header at index zero.
1789 1789 */
1790 1790 if (nshdrs == 0 && nphdrs >= PN_XNUM)
1791 1791 nshdrs = 1;
1792 1792
1793 1793 phdrsz = nphdrs * sizeof (Phdr);
1794 1794 shdrsz = nshdrs * sizeof (Shdr);
1795 1795
1796 1796 bigsize = MAX(sizeof (*bigwad), MAX(phdrsz, shdrsz));
1797 1797 bigwad = kmem_alloc(bigsize, KM_SLEEP);
1798 1798
1799 1799 ehdr = &bigwad->ehdr;
1800 1800 bzero(ehdr, sizeof (*ehdr));
1801 1801
1802 1802 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1803 1803 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1804 1804 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1805 1805 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1806 1806 ehdr->e_ident[EI_CLASS] = ELFCLASS;
1807 1807 ehdr->e_type = ET_CORE;
1808 1808
1809 1809 #if !defined(_LP64) || defined(_ELF32_COMPAT)
1810 1810
1811 1811 #if defined(__sparc)
1812 1812 ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
1813 1813 ehdr->e_machine = EM_SPARC;
1814 1814 #elif defined(__i386) || defined(__i386_COMPAT)
1815 1815 ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
1816 1816 ehdr->e_machine = EM_386;
1817 1817 #else
1818 1818 #error "no recognized machine type is defined"
1819 1819 #endif
1820 1820
1821 1821 #else /* !defined(_LP64) || defined(_ELF32_COMPAT) */
1822 1822
1823 1823 #if defined(__sparc)
1824 1824 ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
1825 1825 ehdr->e_machine = EM_SPARCV9;
1826 1826 #elif defined(__amd64)
1827 1827 ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
1828 1828 ehdr->e_machine = EM_AMD64;
1829 1829 #else
1830 1830 #error "no recognized 64-bit machine type is defined"
1831 1831 #endif
1832 1832
1833 1833 #endif /* !defined(_LP64) || defined(_ELF32_COMPAT) */
1834 1834
1835 1835 /*
1836 1836 * If the count of program headers or section headers or the index
1837 1837 * of the section string table can't fit in the mere 16 bits
1838 1838 * shortsightedly allotted to them in the ELF header, we use the
1839 1839 * extended formats and put the real values in the section header
1840 1840 * as index 0.
1841 1841 */
1842 1842 ehdr->e_version = EV_CURRENT;
1843 1843 ehdr->e_ehsize = sizeof (Ehdr);
1844 1844
1845 1845 if (nphdrs >= PN_XNUM)
1846 1846 ehdr->e_phnum = PN_XNUM;
1847 1847 else
1848 1848 ehdr->e_phnum = (unsigned short)nphdrs;
1849 1849
1850 1850 ehdr->e_phoff = sizeof (Ehdr);
1851 1851 ehdr->e_phentsize = sizeof (Phdr);
1852 1852
1853 1853 if (nshdrs > 0) {
1854 1854 if (nshdrs >= SHN_LORESERVE)
1855 1855 ehdr->e_shnum = 0;
1856 1856 else
1857 1857 ehdr->e_shnum = (unsigned short)nshdrs;
1858 1858
1859 1859 if (nshdrs - 1 >= SHN_LORESERVE)
1860 1860 ehdr->e_shstrndx = SHN_XINDEX;
1861 1861 else
1862 1862 ehdr->e_shstrndx = (unsigned short)(nshdrs - 1);
1863 1863
1864 1864 ehdr->e_shoff = ehdr->e_phoff + ehdr->e_phentsize * nphdrs;
1865 1865 ehdr->e_shentsize = sizeof (Shdr);
1866 1866 }
1867 1867
1868 1868 if (error = core_write(vp, UIO_SYSSPACE, (offset_t)0, ehdr,
1869 1869 sizeof (Ehdr), rlimit, credp))
1870 1870 goto done;
1871 1871
1872 1872 poffset = sizeof (Ehdr);
1873 1873 soffset = sizeof (Ehdr) + phdrsz;
1874 1874 doffset = sizeof (Ehdr) + phdrsz + shdrsz;
1875 1875
1876 1876 v = &bigwad->phdr[0];
1877 1877 bzero(v, phdrsz);
1878 1878
1879 1879 setup_old_note_header(&v[0], p);
1880 1880 v[0].p_offset = doffset = roundup(doffset, sizeof (Word));
1881 1881 doffset += v[0].p_filesz;
1882 1882
1883 1883 setup_note_header(&v[1], p);
1884 1884 v[1].p_offset = doffset = roundup(doffset, sizeof (Word));
1885 1885 doffset += v[1].p_filesz;
1886 1886
1887 1887 mutex_enter(&p->p_lock);
1888 1888
1889 1889 brkbase = p->p_brkbase;
1890 1890 brksize = p->p_brksize;
1891 1891
1892 1892 stkbase = p->p_usrstack - p->p_stksize;
1893 1893 stksize = p->p_stksize;
1894 1894
1895 1895 mutex_exit(&p->p_lock);
1896 1896
1897 1897 AS_LOCK_ENTER(as, RW_WRITER);
1898 1898 i = 2;
1899 1899 for (seg = AS_SEGFIRST(as); seg != NULL; seg = AS_SEGNEXT(as, seg)) {
1900 1900 caddr_t eaddr = seg->s_base + pr_getsegsize(seg, 0);
1901 1901 caddr_t saddr, naddr;
1902 1902 void *tmp = NULL;
1903 1903 extern struct seg_ops segspt_shmops;
1904 1904
1905 1905 for (saddr = seg->s_base; saddr < eaddr; saddr = naddr) {
1906 1906 uint_t prot;
1907 1907 size_t size;
1908 1908 int type;
1909 1909 vnode_t *mvp;
1910 1910
1911 1911 prot = pr_getprot(seg, 0, &tmp, &saddr, &naddr, eaddr);
1912 1912 prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
1913 1913 if ((size = (size_t)(naddr - saddr)) == 0)
1914 1914 continue;
1915 1915 if (i == nphdrs) {
1916 1916 overflow++;
1917 1917 continue;
1918 1918 }
1919 1919 v[i].p_type = PT_LOAD;
1920 1920 v[i].p_vaddr = (Addr)(uintptr_t)saddr;
1921 1921 v[i].p_memsz = size;
1922 1922 if (prot & PROT_READ)
1923 1923 v[i].p_flags |= PF_R;
1924 1924 if (prot & PROT_WRITE)
1925 1925 v[i].p_flags |= PF_W;
1926 1926 if (prot & PROT_EXEC)
1927 1927 v[i].p_flags |= PF_X;
1928 1928
1929 1929 /*
1930 1930 * Figure out which mappings to include in the core.
1931 1931 */
1932 1932 type = SEGOP_GETTYPE(seg, saddr);
1933 1933
1934 1934 if (saddr == stkbase && size == stksize) {
1935 1935 if (!(content & CC_CONTENT_STACK))
1936 1936 goto exclude;
1937 1937
1938 1938 } else if (saddr == brkbase && size == brksize) {
1939 1939 if (!(content & CC_CONTENT_HEAP))
1940 1940 goto exclude;
1941 1941
1942 1942 } else if (seg->s_ops == &segspt_shmops) {
1943 1943 if (type & MAP_NORESERVE) {
1944 1944 if (!(content & CC_CONTENT_DISM))
1945 1945 goto exclude;
1946 1946 } else {
1947 1947 if (!(content & CC_CONTENT_ISM))
1948 1948 goto exclude;
1949 1949 }
1950 1950
1951 1951 } else if (seg->s_ops != &segvn_ops) {
1952 1952 goto exclude;
1953 1953
1954 1954 } else if (type & MAP_SHARED) {
1955 1955 if (shmgetid(p, saddr) != SHMID_NONE) {
1956 1956 if (!(content & CC_CONTENT_SHM))
1957 1957 goto exclude;
1958 1958
1959 1959 } else if (SEGOP_GETVP(seg, seg->s_base,
1960 1960 &mvp) != 0 || mvp == NULL ||
1961 1961 mvp->v_type != VREG) {
1962 1962 if (!(content & CC_CONTENT_SHANON))
1963 1963 goto exclude;
1964 1964
1965 1965 } else {
1966 1966 if (!(content & CC_CONTENT_SHFILE))
1967 1967 goto exclude;
1968 1968 }
1969 1969
1970 1970 } else if (SEGOP_GETVP(seg, seg->s_base, &mvp) != 0 ||
1971 1971 mvp == NULL || mvp->v_type != VREG) {
1972 1972 if (!(content & CC_CONTENT_ANON))
1973 1973 goto exclude;
1974 1974
1975 1975 } else if (prot == (PROT_READ | PROT_EXEC)) {
1976 1976 if (!(content & CC_CONTENT_TEXT))
1977 1977 goto exclude;
1978 1978
1979 1979 } else if (prot == PROT_READ) {
1980 1980 if (!(content & CC_CONTENT_RODATA))
1981 1981 goto exclude;
1982 1982
1983 1983 } else {
1984 1984 if (!(content & CC_CONTENT_DATA))
1985 1985 goto exclude;
1986 1986 }
1987 1987
1988 1988 doffset = roundup(doffset, sizeof (Word));
1989 1989 v[i].p_offset = doffset;
1990 1990 v[i].p_filesz = size;
1991 1991 doffset += size;
1992 1992 exclude:
1993 1993 i++;
1994 1994 }
1995 1995 ASSERT(tmp == NULL);
1996 1996 }
1997 1997 AS_LOCK_EXIT(as);
1998 1998
1999 1999 if (overflow || i != nphdrs) {
2000 2000 if (ntries++ == 0) {
2001 2001 kmem_free(bigwad, bigsize);
2002 2002 overflow = 0;
2003 2003 goto top;
2004 2004 }
2005 2005 cmn_err(CE_WARN, "elfcore: core dump failed for "
2006 2006 "process %d; address space is changing", p->p_pid);
2007 2007 error = EIO;
2008 2008 goto done;
2009 2009 }
2010 2010
2011 2011 if ((error = core_write(vp, UIO_SYSSPACE, poffset,
2012 2012 v, phdrsz, rlimit, credp)) != 0)
2013 2013 goto done;
2014 2014
2015 2015 if ((error = write_old_elfnotes(p, sig, vp, v[0].p_offset, rlimit,
2016 2016 credp)) != 0)
2017 2017 goto done;
2018 2018
2019 2019 if ((error = write_elfnotes(p, sig, vp, v[1].p_offset, rlimit,
2020 2020 credp, content)) != 0)
2021 2021 goto done;
2022 2022
2023 2023 for (i = 2; i < nphdrs; i++) {
2024 2024 prkillinfo_t killinfo;
2025 2025 sigqueue_t *sq;
2026 2026 int sig, j;
2027 2027
2028 2028 if (v[i].p_filesz == 0)
2029 2029 continue;
2030 2030
2031 2031 /*
2032 2032 * If dumping out this segment fails, rather than failing
2033 2033 * the core dump entirely, we reset the size of the mapping
2034 2034 * to zero to indicate that the data is absent from the core
2035 2035 * file and or in the PF_SUNW_FAILURE flag to differentiate
2036 2036 * this from mappings that were excluded due to the core file
2037 2037 * content settings.
2038 2038 */
2039 2039 if ((error = core_seg(p, vp, v[i].p_offset,
2040 2040 (caddr_t)(uintptr_t)v[i].p_vaddr, v[i].p_filesz,
2041 2041 rlimit, credp)) == 0) {
2042 2042 continue;
2043 2043 }
2044 2044
2045 2045 if ((sig = lwp->lwp_cursig) == 0) {
2046 2046 /*
2047 2047 * We failed due to something other than a signal.
2048 2048 * Since the space reserved for the segment is now
2049 2049 * unused, we stash the errno in the first four
2050 2050 * bytes. This undocumented interface will let us
2051 2051 * understand the nature of the failure.
2052 2052 */
2053 2053 (void) core_write(vp, UIO_SYSSPACE, v[i].p_offset,
2054 2054 &error, sizeof (error), rlimit, credp);
2055 2055
2056 2056 v[i].p_filesz = 0;
2057 2057 v[i].p_flags |= PF_SUNW_FAILURE;
2058 2058 if ((error = core_write(vp, UIO_SYSSPACE,
2059 2059 poffset + sizeof (v[i]) * i, &v[i], sizeof (v[i]),
2060 2060 rlimit, credp)) != 0)
2061 2061 goto done;
2062 2062
2063 2063 continue;
2064 2064 }
2065 2065
2066 2066 /*
2067 2067 * We took a signal. We want to abort the dump entirely, but
2068 2068 * we also want to indicate what failed and why. We therefore
2069 2069 * use the space reserved for the first failing segment to
2070 2070 * write our error (which, for purposes of compatability with
2071 2071 * older core dump readers, we set to EINTR) followed by any
2072 2072 * siginfo associated with the signal.
2073 2073 */
2074 2074 bzero(&killinfo, sizeof (killinfo));
2075 2075 killinfo.prk_error = EINTR;
2076 2076
2077 2077 sq = sig == SIGKILL ? curproc->p_killsqp : lwp->lwp_curinfo;
2078 2078
2079 2079 if (sq != NULL) {
2080 2080 bcopy(&sq->sq_info, &killinfo.prk_info,
2081 2081 sizeof (sq->sq_info));
2082 2082 } else {
2083 2083 killinfo.prk_info.si_signo = lwp->lwp_cursig;
2084 2084 killinfo.prk_info.si_code = SI_NOINFO;
2085 2085 }
2086 2086
2087 2087 #if (defined(_SYSCALL32_IMPL) || defined(_LP64))
2088 2088 /*
2089 2089 * If this is a 32-bit process, we need to translate from the
2090 2090 * native siginfo to the 32-bit variant. (Core readers must
2091 2091 * always have the same data model as their target or must
2092 2092 * be aware of -- and compensate for -- data model differences.)
2093 2093 */
2094 2094 if (curproc->p_model == DATAMODEL_ILP32) {
2095 2095 siginfo32_t si32;
2096 2096
2097 2097 siginfo_kto32((k_siginfo_t *)&killinfo.prk_info, &si32);
2098 2098 bcopy(&si32, &killinfo.prk_info, sizeof (si32));
2099 2099 }
2100 2100 #endif
2101 2101
2102 2102 (void) core_write(vp, UIO_SYSSPACE, v[i].p_offset,
2103 2103 &killinfo, sizeof (killinfo), rlimit, credp);
2104 2104
2105 2105 /*
2106 2106 * For the segment on which we took the signal, indicate that
2107 2107 * its data now refers to a siginfo.
2108 2108 */
2109 2109 v[i].p_filesz = 0;
2110 2110 v[i].p_flags |= PF_SUNW_FAILURE | PF_SUNW_KILLED |
2111 2111 PF_SUNW_SIGINFO;
2112 2112
2113 2113 /*
2114 2114 * And for every other segment, indicate that its absence
2115 2115 * is due to a signal.
2116 2116 */
2117 2117 for (j = i + 1; j < nphdrs; j++) {
2118 2118 v[j].p_filesz = 0;
2119 2119 v[j].p_flags |= PF_SUNW_FAILURE | PF_SUNW_KILLED;
2120 2120 }
2121 2121
2122 2122 /*
2123 2123 * Finally, write out our modified program headers.
2124 2124 */
2125 2125 if ((error = core_write(vp, UIO_SYSSPACE,
2126 2126 poffset + sizeof (v[i]) * i, &v[i],
2127 2127 sizeof (v[i]) * (nphdrs - i), rlimit, credp)) != 0)
2128 2128 goto done;
2129 2129
2130 2130 break;
2131 2131 }
2132 2132
2133 2133 if (nshdrs > 0) {
2134 2134 bzero(&bigwad->shdr[0], shdrsz);
2135 2135
2136 2136 if (nshdrs >= SHN_LORESERVE)
2137 2137 bigwad->shdr[0].sh_size = nshdrs;
2138 2138
2139 2139 if (nshdrs - 1 >= SHN_LORESERVE)
2140 2140 bigwad->shdr[0].sh_link = nshdrs - 1;
2141 2141
2142 2142 if (nphdrs >= PN_XNUM)
2143 2143 bigwad->shdr[0].sh_info = nphdrs;
2144 2144
2145 2145 if (nshdrs > 1) {
2146 2146 AS_LOCK_ENTER(as, RW_WRITER);
2147 2147 if ((error = process_scns(content, p, credp, vp,
2148 2148 &bigwad->shdr[0], nshdrs, rlimit, &doffset,
2149 2149 NULL)) != 0) {
2150 2150 AS_LOCK_EXIT(as);
2151 2151 goto done;
2152 2152 }
2153 2153 AS_LOCK_EXIT(as);
2154 2154 }
2155 2155
2156 2156 if ((error = core_write(vp, UIO_SYSSPACE, soffset,
2157 2157 &bigwad->shdr[0], shdrsz, rlimit, credp)) != 0)
2158 2158 goto done;
2159 2159 }
2160 2160
2161 2161 done:
2162 2162 kmem_free(bigwad, bigsize);
2163 2163 return (error);
2164 2164 }
2165 2165
2166 2166 #ifndef _ELF32_COMPAT
2167 2167
2168 2168 static struct execsw esw = {
2169 2169 #ifdef _LP64
2170 2170 elf64magicstr,
2171 2171 #else /* _LP64 */
2172 2172 elf32magicstr,
2173 2173 #endif /* _LP64 */
2174 2174 0,
2175 2175 5,
2176 2176 elfexec,
2177 2177 elfcore
2178 2178 };
2179 2179
2180 2180 static struct modlexec modlexec = {
2181 2181 &mod_execops, "exec module for elf", &esw
2182 2182 };
2183 2183
2184 2184 #ifdef _LP64
2185 2185 extern int elf32exec(vnode_t *vp, execa_t *uap, uarg_t *args,
2186 2186 intpdata_t *idatap, int level, long *execsz,
2187 2187 int setid, caddr_t exec_file, cred_t *cred,
2188 2188 int brand_action);
2189 2189 extern int elf32core(vnode_t *vp, proc_t *p, cred_t *credp,
2190 2190 rlim64_t rlimit, int sig, core_content_t content);
2191 2191
2192 2192 static struct execsw esw32 = {
2193 2193 elf32magicstr,
2194 2194 0,
2195 2195 5,
2196 2196 elf32exec,
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2197 2197 elf32core
2198 2198 };
2199 2199
2200 2200 static struct modlexec modlexec32 = {
2201 2201 &mod_execops, "32-bit exec module for elf", &esw32
2202 2202 };
2203 2203 #endif /* _LP64 */
2204 2204
2205 2205 static struct modlinkage modlinkage = {
2206 2206 MODREV_1,
2207 - (void *)&modlexec,
2207 + { (void *)&modlexec,
2208 2208 #ifdef _LP64
2209 - (void *)&modlexec32,
2209 + (void *)&modlexec32,
2210 2210 #endif /* _LP64 */
2211 - NULL
2211 + NULL
2212 + }
2212 2213 };
2213 2214
2214 2215 int
2215 2216 _init(void)
2216 2217 {
2217 2218 return (mod_install(&modlinkage));
2218 2219 }
2219 2220
2220 2221 int
2221 2222 _fini(void)
2222 2223 {
2223 2224 return (mod_remove(&modlinkage));
2224 2225 }
2225 2226
2226 2227 int
2227 2228 _info(struct modinfo *modinfop)
2228 2229 {
2229 2230 return (mod_info(&modlinkage, modinfop));
2230 2231 }
2231 2232
2232 2233 #endif /* !_ELF32_COMPAT */
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