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 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25 /*
26 * Copyright 2012 DEY Storage Systems, Inc. All rights reserved.
27 * Copyright (c) 2018, Joyent, Inc. All rights reserved.
28 * Copyright (c) 2013 by Delphix. All rights reserved.
29 * Copyright 2015 Gary Mills
30 * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
31 * Copyright 2023 Oxide Computer Company
32 */
33
34 #include <sys/types.h>
35 #include <sys/utsname.h>
36 #include <sys/sysmacros.h>
37 #include <sys/proc.h>
38
39 #include <alloca.h>
40 #include <rtld_db.h>
41 #include <libgen.h>
42 #include <limits.h>
43 #include <string.h>
44 #include <stdlib.h>
45 #include <unistd.h>
46 #include <errno.h>
47 #include <gelf.h>
48 #include <stddef.h>
49 #include <signal.h>
50
51 #include "libproc.h"
52 #include "Pcontrol.h"
53 #include "P32ton.h"
54 #include "Putil.h"
55 #include "proc_fd.h"
56 #ifdef __x86
57 #include "Pcore_linux.h"
58 #endif
59
60 /*
61 * Pcore.c - Code to initialize a ps_prochandle from a core dump. We
62 * allocate an additional structure to hold information from the core
63 * file, and attach this to the standard ps_prochandle in place of the
64 * ability to examine /proc/<pid>/ files.
65 */
66
67 /*
68 * Basic i/o function for reading and writing from the process address space
69 * stored in the core file and associated shared libraries. We compute the
70 * appropriate fd and offsets, and let the provided prw function do the rest.
71 */
72 static ssize_t
core_rw(struct ps_prochandle * P,void * buf,size_t n,uintptr_t addr,ssize_t (* prw)(int,void *,size_t,off64_t))73 core_rw(struct ps_prochandle *P, void *buf, size_t n, uintptr_t addr,
74 ssize_t (*prw)(int, void *, size_t, off64_t))
75 {
76 ssize_t resid = n;
77
78 while (resid != 0) {
79 map_info_t *mp = Paddr2mptr(P, addr);
80
81 uintptr_t mapoff;
82 ssize_t len;
83 off64_t off;
84 int fd;
85
86 if (mp == NULL)
87 break; /* No mapping for this address */
88
89 if (mp->map_pmap.pr_mflags & MA_RESERVED1) {
90 if (mp->map_file == NULL || mp->map_file->file_fd < 0)
91 break; /* No file or file not open */
92
93 fd = mp->map_file->file_fd;
94 } else
95 fd = P->asfd;
96
97 mapoff = addr - mp->map_pmap.pr_vaddr;
98 len = MIN(resid, mp->map_pmap.pr_size - mapoff);
99 off = mp->map_offset + mapoff;
100
101 if ((len = prw(fd, buf, len, off)) <= 0)
102 break;
103
104 resid -= len;
105 addr += len;
106 buf = (char *)buf + len;
107 }
108
109 /*
110 * Important: Be consistent with the behavior of i/o on the as file:
111 * writing to an invalid address yields EIO; reading from an invalid
112 * address falls through to returning success and zero bytes.
113 */
114 if (resid == n && n != 0 && prw != pread64) {
115 errno = EIO;
116 return (-1);
117 }
118
119 return (n - resid);
120 }
121
122 /*ARGSUSED*/
123 static ssize_t
Pread_core(struct ps_prochandle * P,void * buf,size_t n,uintptr_t addr,void * data)124 Pread_core(struct ps_prochandle *P, void *buf, size_t n, uintptr_t addr,
125 void *data)
126 {
127 return (core_rw(P, buf, n, addr, pread64));
128 }
129
130 /*ARGSUSED*/
131 static ssize_t
Pwrite_core(struct ps_prochandle * P,const void * buf,size_t n,uintptr_t addr,void * data)132 Pwrite_core(struct ps_prochandle *P, const void *buf, size_t n, uintptr_t addr,
133 void *data)
134 {
135 return (core_rw(P, (void *)buf, n, addr,
136 (ssize_t (*)(int, void *, size_t, off64_t)) pwrite64));
137 }
138
139 /*ARGSUSED*/
140 static int
Pcred_core(struct ps_prochandle * P,prcred_t * pcrp,int ngroups,void * data)141 Pcred_core(struct ps_prochandle *P, prcred_t *pcrp, int ngroups, void *data)
142 {
143 core_info_t *core = data;
144
145 if (core->core_cred != NULL) {
146 /*
147 * Avoid returning more supplementary group data than the
148 * caller has allocated in their buffer. We expect them to
149 * check pr_ngroups afterward and potentially call us again.
150 */
151 ngroups = MIN(ngroups, core->core_cred->pr_ngroups);
152
153 (void) memcpy(pcrp, core->core_cred,
154 sizeof (prcred_t) + (ngroups - 1) * sizeof (gid_t));
155
156 return (0);
157 }
158
159 errno = ENODATA;
160 return (-1);
161 }
162
163 /*ARGSUSED*/
164 static int
Psecflags_core(struct ps_prochandle * P,prsecflags_t ** psf,void * data)165 Psecflags_core(struct ps_prochandle *P, prsecflags_t **psf, void *data)
166 {
167 core_info_t *core = data;
168
169 if (core->core_secflags == NULL) {
170 errno = ENODATA;
171 return (-1);
172 }
173
174 if ((*psf = calloc(1, sizeof (prsecflags_t))) == NULL)
175 return (-1);
176
177 (void) memcpy(*psf, core->core_secflags, sizeof (prsecflags_t));
178
179 return (0);
180 }
181
182 /*ARGSUSED*/
183 static int
Ppriv_core(struct ps_prochandle * P,prpriv_t ** pprv,void * data)184 Ppriv_core(struct ps_prochandle *P, prpriv_t **pprv, void *data)
185 {
186 core_info_t *core = data;
187
188 if (core->core_priv == NULL) {
189 errno = ENODATA;
190 return (-1);
191 }
192
193 *pprv = malloc(core->core_priv_size);
194 if (*pprv == NULL) {
195 return (-1);
196 }
197
198 (void) memcpy(*pprv, core->core_priv, core->core_priv_size);
199 return (0);
200 }
201
202 /*ARGSUSED*/
203 static const psinfo_t *
Ppsinfo_core(struct ps_prochandle * P,psinfo_t * psinfo,void * data)204 Ppsinfo_core(struct ps_prochandle *P, psinfo_t *psinfo, void *data)
205 {
206 return (&P->psinfo);
207 }
208
209 /*ARGSUSED*/
210 static void
Pfini_core(struct ps_prochandle * P,void * data)211 Pfini_core(struct ps_prochandle *P, void *data)
212 {
213 core_info_t *core = data;
214
215 if (core != NULL) {
216 extern void __priv_free_info(void *);
217 lwp_info_t *lwp;
218
219 while ((lwp = list_remove_head(&core->core_lwp_head)) != NULL) {
220 #ifdef __sparc
221 if (lwp->lwp_gwins != NULL)
222 free(lwp->lwp_gwins);
223 if (lwp->lwp_xregs != NULL)
224 free(lwp->lwp_xregs);
225 if (lwp->lwp_asrs != NULL)
226 free(lwp->lwp_asrs);
227 #endif
228 free(lwp);
229 }
230
231 if (core->core_platform != NULL)
232 free(core->core_platform);
233 if (core->core_uts != NULL)
234 free(core->core_uts);
235 if (core->core_cred != NULL)
236 free(core->core_cred);
237 if (core->core_priv != NULL)
238 free(core->core_priv);
239 if (core->core_privinfo != NULL)
240 __priv_free_info(core->core_privinfo);
241 if (core->core_ppii != NULL)
242 free(core->core_ppii);
243 if (core->core_zonename != NULL)
244 free(core->core_zonename);
245 if (core->core_secflags != NULL)
246 free(core->core_secflags);
247 if (core->core_upanic != NULL)
248 free(core->core_upanic);
249 #ifdef __x86
250 if (core->core_ldt != NULL)
251 free(core->core_ldt);
252 #endif
253
254 free(core);
255 }
256 }
257
258 /*ARGSUSED*/
259 static char *
Pplatform_core(struct ps_prochandle * P,char * s,size_t n,void * data)260 Pplatform_core(struct ps_prochandle *P, char *s, size_t n, void *data)
261 {
262 core_info_t *core = data;
263
264 if (core->core_platform == NULL) {
265 errno = ENODATA;
266 return (NULL);
267 }
268 (void) strncpy(s, core->core_platform, n - 1);
269 s[n - 1] = '\0';
270 return (s);
271 }
272
273 /*ARGSUSED*/
274 static int
Puname_core(struct ps_prochandle * P,struct utsname * u,void * data)275 Puname_core(struct ps_prochandle *P, struct utsname *u, void *data)
276 {
277 core_info_t *core = data;
278
279 if (core->core_uts == NULL) {
280 errno = ENODATA;
281 return (-1);
282 }
283 (void) memcpy(u, core->core_uts, sizeof (struct utsname));
284 return (0);
285 }
286
287 /*ARGSUSED*/
288 static char *
Pzonename_core(struct ps_prochandle * P,char * s,size_t n,void * data)289 Pzonename_core(struct ps_prochandle *P, char *s, size_t n, void *data)
290 {
291 core_info_t *core = data;
292
293 if (core->core_zonename == NULL) {
294 errno = ENODATA;
295 return (NULL);
296 }
297 (void) strlcpy(s, core->core_zonename, n);
298 return (s);
299 }
300
301 #ifdef __x86
302 /*ARGSUSED*/
303 static int
Pldt_core(struct ps_prochandle * P,struct ssd * pldt,int nldt,void * data)304 Pldt_core(struct ps_prochandle *P, struct ssd *pldt, int nldt, void *data)
305 {
306 core_info_t *core = data;
307
308 if (pldt == NULL || nldt == 0)
309 return (core->core_nldt);
310
311 if (core->core_ldt != NULL) {
312 nldt = MIN(nldt, core->core_nldt);
313
314 (void) memcpy(pldt, core->core_ldt,
315 nldt * sizeof (struct ssd));
316
317 return (nldt);
318 }
319
320 errno = ENODATA;
321 return (-1);
322 }
323 #endif
324
325 static const ps_ops_t P_core_ops = {
326 .pop_pread = Pread_core,
327 .pop_pwrite = Pwrite_core,
328 .pop_cred = Pcred_core,
329 .pop_priv = Ppriv_core,
330 .pop_psinfo = Ppsinfo_core,
331 .pop_fini = Pfini_core,
332 .pop_platform = Pplatform_core,
333 .pop_uname = Puname_core,
334 .pop_zonename = Pzonename_core,
335 .pop_secflags = Psecflags_core,
336 #ifdef __x86
337 .pop_ldt = Pldt_core
338 #endif
339 };
340
341 /*
342 * Return the lwp_info_t for the given lwpid. If no such lwpid has been
343 * encountered yet, allocate a new structure and return a pointer to it.
344 * Create a list of lwp_info_t structures sorted in decreasing lwp_id order.
345 */
346 static lwp_info_t *
lwpid2info(struct ps_prochandle * P,lwpid_t id)347 lwpid2info(struct ps_prochandle *P, lwpid_t id)
348 {
349 core_info_t *core = P->data;
350 lwp_info_t *lwp, *prev;
351
352 for (lwp = list_head(&core->core_lwp_head); lwp != NULL;
353 lwp = list_next(&core->core_lwp_head, lwp)) {
354 if (lwp->lwp_id == id) {
355 core->core_lwp = lwp;
356 return (lwp);
357 }
358 if (lwp->lwp_id < id) {
359 break;
360 }
361 }
362
363 prev = lwp;
364 if ((lwp = calloc(1, sizeof (lwp_info_t))) == NULL)
365 return (NULL);
366
367 list_insert_before(&core->core_lwp_head, prev, lwp);
368 lwp->lwp_id = id;
369
370 core->core_lwp = lwp;
371
372 return (lwp);
373 }
374
375 /*
376 * The core file itself contains a series of NOTE segments containing saved
377 * structures from /proc at the time the process died. For each note we
378 * comprehend, we define a function to read it in from the core file,
379 * convert it to our native data model if necessary, and store it inside
380 * the ps_prochandle. Each function is invoked by Pfgrab_core() with the
381 * seek pointer on P->asfd positioned appropriately. We populate a table
382 * of pointers to these note functions below.
383 */
384
385 static int
note_pstatus(struct ps_prochandle * P,size_t nbytes)386 note_pstatus(struct ps_prochandle *P, size_t nbytes)
387 {
388 #ifdef _LP64
389 core_info_t *core = P->data;
390
391 if (core->core_dmodel == PR_MODEL_ILP32) {
392 pstatus32_t ps32;
393
394 if (nbytes < sizeof (pstatus32_t) ||
395 read(P->asfd, &ps32, sizeof (ps32)) != sizeof (ps32))
396 goto err;
397
398 pstatus_32_to_n(&ps32, &P->status);
399
400 } else
401 #endif
402 if (nbytes < sizeof (pstatus_t) ||
403 read(P->asfd, &P->status, sizeof (pstatus_t)) != sizeof (pstatus_t))
404 goto err;
405
406 P->orig_status = P->status;
407 P->pid = P->status.pr_pid;
408
409 return (0);
410
411 err:
412 dprintf("Pgrab_core: failed to read NT_PSTATUS\n");
413 return (-1);
414 }
415
416 static int
note_lwpstatus(struct ps_prochandle * P,size_t nbytes)417 note_lwpstatus(struct ps_prochandle *P, size_t nbytes)
418 {
419 lwp_info_t *lwp;
420 lwpstatus_t lps;
421
422 #ifdef _LP64
423 core_info_t *core = P->data;
424
425 if (core->core_dmodel == PR_MODEL_ILP32) {
426 lwpstatus32_t l32;
427
428 if (nbytes < sizeof (lwpstatus32_t) ||
429 read(P->asfd, &l32, sizeof (l32)) != sizeof (l32))
430 goto err;
431
432 lwpstatus_32_to_n(&l32, &lps);
433 } else
434 #endif
435 if (nbytes < sizeof (lwpstatus_t) ||
436 read(P->asfd, &lps, sizeof (lps)) != sizeof (lps))
437 goto err;
438
439 if ((lwp = lwpid2info(P, lps.pr_lwpid)) == NULL) {
440 dprintf("Pgrab_core: failed to add NT_LWPSTATUS\n");
441 return (-1);
442 }
443
444 /*
445 * Erase a useless and confusing artifact of the kernel implementation:
446 * the lwps which did *not* create the core will show SIGKILL. We can
447 * be assured this is bogus because SIGKILL can't produce core files.
448 */
449 if (lps.pr_cursig == SIGKILL)
450 lps.pr_cursig = 0;
451
452 (void) memcpy(&lwp->lwp_status, &lps, sizeof (lps));
453 return (0);
454
455 err:
456 dprintf("Pgrab_core: failed to read NT_LWPSTATUS\n");
457 return (-1);
458 }
459
460 #ifdef __x86
461
462 static void
lx_prpsinfo32_to_psinfo(lx_prpsinfo32_t * p32,psinfo_t * psinfo)463 lx_prpsinfo32_to_psinfo(lx_prpsinfo32_t *p32, psinfo_t *psinfo)
464 {
465 psinfo->pr_flag = p32->pr_flag;
466 psinfo->pr_pid = p32->pr_pid;
467 psinfo->pr_ppid = p32->pr_ppid;
468 psinfo->pr_uid = p32->pr_uid;
469 psinfo->pr_gid = p32->pr_gid;
470 psinfo->pr_sid = p32->pr_sid;
471 psinfo->pr_pgid = p32->pr_pgrp;
472
473 (void) memcpy(psinfo->pr_fname, p32->pr_fname,
474 sizeof (psinfo->pr_fname));
475 (void) memcpy(psinfo->pr_psargs, p32->pr_psargs,
476 sizeof (psinfo->pr_psargs));
477 }
478
479 static void
lx_prpsinfo64_to_psinfo(lx_prpsinfo64_t * p64,psinfo_t * psinfo)480 lx_prpsinfo64_to_psinfo(lx_prpsinfo64_t *p64, psinfo_t *psinfo)
481 {
482 psinfo->pr_flag = p64->pr_flag;
483 psinfo->pr_pid = p64->pr_pid;
484 psinfo->pr_ppid = p64->pr_ppid;
485 psinfo->pr_uid = p64->pr_uid;
486 psinfo->pr_gid = p64->pr_gid;
487 psinfo->pr_sid = p64->pr_sid;
488 psinfo->pr_pgid = p64->pr_pgrp;
489 psinfo->pr_pgid = p64->pr_pgrp;
490
491 (void) memcpy(psinfo->pr_fname, p64->pr_fname,
492 sizeof (psinfo->pr_fname));
493 (void) memcpy(psinfo->pr_psargs, p64->pr_psargs,
494 sizeof (psinfo->pr_psargs));
495 }
496
497 static int
note_linux_psinfo(struct ps_prochandle * P,size_t nbytes)498 note_linux_psinfo(struct ps_prochandle *P, size_t nbytes)
499 {
500 core_info_t *core = P->data;
501 lx_prpsinfo32_t p32;
502 lx_prpsinfo64_t p64;
503
504 if (core->core_dmodel == PR_MODEL_ILP32) {
505 if (nbytes < sizeof (p32) ||
506 read(P->asfd, &p32, sizeof (p32)) != sizeof (p32))
507 goto err;
508
509 lx_prpsinfo32_to_psinfo(&p32, &P->psinfo);
510 } else {
511 if (nbytes < sizeof (p64) ||
512 read(P->asfd, &p64, sizeof (p64)) != sizeof (p64))
513 goto err;
514
515 lx_prpsinfo64_to_psinfo(&p64, &P->psinfo);
516 }
517
518
519 P->status.pr_pid = P->psinfo.pr_pid;
520 P->status.pr_ppid = P->psinfo.pr_ppid;
521 P->status.pr_pgid = P->psinfo.pr_pgid;
522 P->status.pr_sid = P->psinfo.pr_sid;
523
524 P->psinfo.pr_nlwp = 0;
525 P->status.pr_nlwp = 0;
526
527 return (0);
528 err:
529 dprintf("Pgrab_core: failed to read NT_PSINFO\n");
530 return (-1);
531 }
532
533 static void
lx_prstatus64_to_lwp(lx_prstatus64_t * prs64,lwp_info_t * lwp)534 lx_prstatus64_to_lwp(lx_prstatus64_t *prs64, lwp_info_t *lwp)
535 {
536 LTIME_TO_TIMESPEC(lwp->lwp_status.pr_utime, prs64->pr_utime);
537 LTIME_TO_TIMESPEC(lwp->lwp_status.pr_stime, prs64->pr_stime);
538
539 lwp->lwp_status.pr_reg[REG_R15] = prs64->pr_reg.lxr_r15;
540 lwp->lwp_status.pr_reg[REG_R14] = prs64->pr_reg.lxr_r14;
541 lwp->lwp_status.pr_reg[REG_R13] = prs64->pr_reg.lxr_r13;
542 lwp->lwp_status.pr_reg[REG_R12] = prs64->pr_reg.lxr_r12;
543 lwp->lwp_status.pr_reg[REG_R11] = prs64->pr_reg.lxr_r11;
544 lwp->lwp_status.pr_reg[REG_R10] = prs64->pr_reg.lxr_r10;
545 lwp->lwp_status.pr_reg[REG_R9] = prs64->pr_reg.lxr_r9;
546 lwp->lwp_status.pr_reg[REG_R8] = prs64->pr_reg.lxr_r8;
547
548 lwp->lwp_status.pr_reg[REG_RDI] = prs64->pr_reg.lxr_rdi;
549 lwp->lwp_status.pr_reg[REG_RSI] = prs64->pr_reg.lxr_rsi;
550 lwp->lwp_status.pr_reg[REG_RBP] = prs64->pr_reg.lxr_rbp;
551 lwp->lwp_status.pr_reg[REG_RBX] = prs64->pr_reg.lxr_rbx;
552 lwp->lwp_status.pr_reg[REG_RDX] = prs64->pr_reg.lxr_rdx;
553 lwp->lwp_status.pr_reg[REG_RCX] = prs64->pr_reg.lxr_rcx;
554 lwp->lwp_status.pr_reg[REG_RAX] = prs64->pr_reg.lxr_rax;
555
556 lwp->lwp_status.pr_reg[REG_RIP] = prs64->pr_reg.lxr_rip;
557 lwp->lwp_status.pr_reg[REG_CS] = prs64->pr_reg.lxr_cs;
558 lwp->lwp_status.pr_reg[REG_RSP] = prs64->pr_reg.lxr_rsp;
559 lwp->lwp_status.pr_reg[REG_FS] = prs64->pr_reg.lxr_fs;
560 lwp->lwp_status.pr_reg[REG_SS] = prs64->pr_reg.lxr_ss;
561 lwp->lwp_status.pr_reg[REG_GS] = prs64->pr_reg.lxr_gs;
562 lwp->lwp_status.pr_reg[REG_ES] = prs64->pr_reg.lxr_es;
563 lwp->lwp_status.pr_reg[REG_DS] = prs64->pr_reg.lxr_ds;
564
565 lwp->lwp_status.pr_reg[REG_GSBASE] = prs64->pr_reg.lxr_gs_base;
566 lwp->lwp_status.pr_reg[REG_FSBASE] = prs64->pr_reg.lxr_fs_base;
567 }
568
569 static void
lx_prstatus32_to_lwp(lx_prstatus32_t * prs32,lwp_info_t * lwp)570 lx_prstatus32_to_lwp(lx_prstatus32_t *prs32, lwp_info_t *lwp)
571 {
572 LTIME_TO_TIMESPEC(lwp->lwp_status.pr_utime, prs32->pr_utime);
573 LTIME_TO_TIMESPEC(lwp->lwp_status.pr_stime, prs32->pr_stime);
574
575 #ifdef __amd64
576 lwp->lwp_status.pr_reg[REG_GS] = prs32->pr_reg.lxr_gs;
577 lwp->lwp_status.pr_reg[REG_FS] = prs32->pr_reg.lxr_fs;
578 lwp->lwp_status.pr_reg[REG_DS] = prs32->pr_reg.lxr_ds;
579 lwp->lwp_status.pr_reg[REG_ES] = prs32->pr_reg.lxr_es;
580 lwp->lwp_status.pr_reg[REG_RDI] = prs32->pr_reg.lxr_di;
581 lwp->lwp_status.pr_reg[REG_RSI] = prs32->pr_reg.lxr_si;
582 lwp->lwp_status.pr_reg[REG_RBP] = prs32->pr_reg.lxr_bp;
583 lwp->lwp_status.pr_reg[REG_RBX] = prs32->pr_reg.lxr_bx;
584 lwp->lwp_status.pr_reg[REG_RDX] = prs32->pr_reg.lxr_dx;
585 lwp->lwp_status.pr_reg[REG_RCX] = prs32->pr_reg.lxr_cx;
586 lwp->lwp_status.pr_reg[REG_RAX] = prs32->pr_reg.lxr_ax;
587 lwp->lwp_status.pr_reg[REG_RIP] = prs32->pr_reg.lxr_ip;
588 lwp->lwp_status.pr_reg[REG_CS] = prs32->pr_reg.lxr_cs;
589 lwp->lwp_status.pr_reg[REG_RFL] = prs32->pr_reg.lxr_flags;
590 lwp->lwp_status.pr_reg[REG_RSP] = prs32->pr_reg.lxr_sp;
591 lwp->lwp_status.pr_reg[REG_SS] = prs32->pr_reg.lxr_ss;
592 #else /* __amd64 */
593 lwp->lwp_status.pr_reg[EBX] = prs32->pr_reg.lxr_bx;
594 lwp->lwp_status.pr_reg[ECX] = prs32->pr_reg.lxr_cx;
595 lwp->lwp_status.pr_reg[EDX] = prs32->pr_reg.lxr_dx;
596 lwp->lwp_status.pr_reg[ESI] = prs32->pr_reg.lxr_si;
597 lwp->lwp_status.pr_reg[EDI] = prs32->pr_reg.lxr_di;
598 lwp->lwp_status.pr_reg[EBP] = prs32->pr_reg.lxr_bp;
599 lwp->lwp_status.pr_reg[EAX] = prs32->pr_reg.lxr_ax;
600 lwp->lwp_status.pr_reg[EIP] = prs32->pr_reg.lxr_ip;
601 lwp->lwp_status.pr_reg[UESP] = prs32->pr_reg.lxr_sp;
602
603 lwp->lwp_status.pr_reg[DS] = prs32->pr_reg.lxr_ds;
604 lwp->lwp_status.pr_reg[ES] = prs32->pr_reg.lxr_es;
605 lwp->lwp_status.pr_reg[FS] = prs32->pr_reg.lxr_fs;
606 lwp->lwp_status.pr_reg[GS] = prs32->pr_reg.lxr_gs;
607 lwp->lwp_status.pr_reg[CS] = prs32->pr_reg.lxr_cs;
608 lwp->lwp_status.pr_reg[SS] = prs32->pr_reg.lxr_ss;
609
610 lwp->lwp_status.pr_reg[EFL] = prs32->pr_reg.lxr_flags;
611 #endif /* !__amd64 */
612 }
613
614 static int
note_linux_prstatus(struct ps_prochandle * P,size_t nbytes)615 note_linux_prstatus(struct ps_prochandle *P, size_t nbytes)
616 {
617 core_info_t *core = P->data;
618
619 lx_prstatus64_t prs64;
620 lx_prstatus32_t prs32;
621 lwp_info_t *lwp;
622 lwpid_t tid;
623
624 dprintf("looking for model %d, %ld/%ld\n", core->core_dmodel,
625 (ulong_t)nbytes, (ulong_t)sizeof (prs32));
626 if (core->core_dmodel == PR_MODEL_ILP32) {
627 if (nbytes < sizeof (prs32) ||
628 read(P->asfd, &prs32, sizeof (prs32)) != nbytes)
629 goto err;
630 tid = prs32.pr_pid;
631 } else {
632 if (nbytes < sizeof (prs64) ||
633 read(P->asfd, &prs64, sizeof (prs64)) != nbytes)
634 goto err;
635 tid = prs64.pr_pid;
636 }
637
638 if ((lwp = lwpid2info(P, tid)) == NULL) {
639 dprintf("Pgrab_core: failed to add lwpid2info "
640 "linux_prstatus\n");
641 return (-1);
642 }
643
644 P->psinfo.pr_nlwp++;
645 P->status.pr_nlwp++;
646
647 lwp->lwp_status.pr_lwpid = tid;
648
649 if (core->core_dmodel == PR_MODEL_ILP32)
650 lx_prstatus32_to_lwp(&prs32, lwp);
651 else
652 lx_prstatus64_to_lwp(&prs64, lwp);
653
654 return (0);
655 err:
656 dprintf("Pgrab_core: failed to read NT_PRSTATUS\n");
657 return (-1);
658 }
659
660 #endif /* __x86 */
661
662 static int
note_psinfo(struct ps_prochandle * P,size_t nbytes)663 note_psinfo(struct ps_prochandle *P, size_t nbytes)
664 {
665 #ifdef _LP64
666 core_info_t *core = P->data;
667
668 if (core->core_dmodel == PR_MODEL_ILP32) {
669 psinfo32_t ps32;
670
671 if (nbytes < sizeof (psinfo32_t) ||
672 read(P->asfd, &ps32, sizeof (ps32)) != sizeof (ps32))
673 goto err;
674
675 psinfo_32_to_n(&ps32, &P->psinfo);
676 } else
677 #endif
678 if (nbytes < sizeof (psinfo_t) ||
679 read(P->asfd, &P->psinfo, sizeof (psinfo_t)) != sizeof (psinfo_t))
680 goto err;
681
682 dprintf("pr_fname = <%s>\n", P->psinfo.pr_fname);
683 dprintf("pr_psargs = <%s>\n", P->psinfo.pr_psargs);
684 dprintf("pr_wstat = 0x%x\n", P->psinfo.pr_wstat);
685
686 return (0);
687
688 err:
689 dprintf("Pgrab_core: failed to read NT_PSINFO\n");
690 return (-1);
691 }
692
693 static int
note_lwpsinfo(struct ps_prochandle * P,size_t nbytes)694 note_lwpsinfo(struct ps_prochandle *P, size_t nbytes)
695 {
696 lwp_info_t *lwp;
697 lwpsinfo_t lps;
698
699 #ifdef _LP64
700 core_info_t *core = P->data;
701
702 if (core->core_dmodel == PR_MODEL_ILP32) {
703 lwpsinfo32_t l32;
704
705 if (nbytes < sizeof (lwpsinfo32_t) ||
706 read(P->asfd, &l32, sizeof (l32)) != sizeof (l32))
707 goto err;
708
709 lwpsinfo_32_to_n(&l32, &lps);
710 } else
711 #endif
712 if (nbytes < sizeof (lwpsinfo_t) ||
713 read(P->asfd, &lps, sizeof (lps)) != sizeof (lps))
714 goto err;
715
716 if ((lwp = lwpid2info(P, lps.pr_lwpid)) == NULL) {
717 dprintf("Pgrab_core: failed to add NT_LWPSINFO\n");
718 return (-1);
719 }
720
721 (void) memcpy(&lwp->lwp_psinfo, &lps, sizeof (lps));
722 return (0);
723
724 err:
725 dprintf("Pgrab_core: failed to read NT_LWPSINFO\n");
726 return (-1);
727 }
728
729 static int
note_lwpname(struct ps_prochandle * P,size_t nbytes)730 note_lwpname(struct ps_prochandle *P, size_t nbytes)
731 {
732 prlwpname_t name;
733 lwp_info_t *lwp;
734
735 if (nbytes != sizeof (name) ||
736 read(P->asfd, &name, sizeof (name)) != sizeof (name))
737 goto err;
738
739 if ((lwp = lwpid2info(P, name.pr_lwpid)) == NULL)
740 goto err;
741
742 if (strlcpy(lwp->lwp_name, name.pr_lwpname,
743 sizeof (lwp->lwp_name)) >= sizeof (lwp->lwp_name)) {
744 errno = ENAMETOOLONG;
745 goto err;
746 }
747
748 return (0);
749
750 err:
751 dprintf("Pgrab_core: failed to read NT_LWPNAME\n");
752 return (-1);
753 }
754
755 static int
note_fdinfo(struct ps_prochandle * P,size_t nbytes)756 note_fdinfo(struct ps_prochandle *P, size_t nbytes)
757 {
758 prfdinfo_core_t prfd;
759 fd_info_t *fip;
760
761 if ((nbytes < sizeof (prfd)) ||
762 (read(P->asfd, &prfd, sizeof (prfd)) != sizeof (prfd))) {
763 dprintf("Pgrab_core: failed to read NT_FDINFO\n");
764 return (-1);
765 }
766
767 if ((fip = Pfd2info(P, prfd.pr_fd)) == NULL) {
768 dprintf("Pgrab_core: failed to add NT_FDINFO\n");
769 return (-1);
770 }
771 if (fip->fd_info == NULL) {
772 if (proc_fdinfo_from_core(&prfd, &fip->fd_info) != 0) {
773 dprintf("Pgrab_core: failed to convert NT_FDINFO\n");
774 return (-1);
775 }
776 }
777
778 return (0);
779 }
780
781 static int
note_platform(struct ps_prochandle * P,size_t nbytes)782 note_platform(struct ps_prochandle *P, size_t nbytes)
783 {
784 core_info_t *core = P->data;
785 char *plat;
786
787 if (core->core_platform != NULL)
788 return (0); /* Already seen */
789
790 if (nbytes != 0 && ((plat = malloc(nbytes + 1)) != NULL)) {
791 if (read(P->asfd, plat, nbytes) != nbytes) {
792 dprintf("Pgrab_core: failed to read NT_PLATFORM\n");
793 free(plat);
794 return (-1);
795 }
796 plat[nbytes - 1] = '\0';
797 core->core_platform = plat;
798 }
799
800 return (0);
801 }
802
803 static int
note_secflags(struct ps_prochandle * P,size_t nbytes)804 note_secflags(struct ps_prochandle *P, size_t nbytes)
805 {
806 core_info_t *core = P->data;
807 prsecflags_t *psf;
808
809 if (core->core_secflags != NULL)
810 return (0); /* Already seen */
811
812 if (sizeof (*psf) != nbytes) {
813 dprintf("Pgrab_core: NT_SECFLAGS changed size."
814 " Need to handle a version change?\n");
815 return (-1);
816 }
817
818 if (nbytes != 0 && ((psf = malloc(nbytes)) != NULL)) {
819 if (read(P->asfd, psf, nbytes) != nbytes) {
820 dprintf("Pgrab_core: failed to read NT_SECFLAGS\n");
821 free(psf);
822 return (-1);
823 }
824
825 core->core_secflags = psf;
826 }
827
828 return (0);
829 }
830
831 static int
note_utsname(struct ps_prochandle * P,size_t nbytes)832 note_utsname(struct ps_prochandle *P, size_t nbytes)
833 {
834 core_info_t *core = P->data;
835 size_t ubytes = sizeof (struct utsname);
836 struct utsname *utsp;
837
838 if (core->core_uts != NULL || nbytes < ubytes)
839 return (0); /* Already seen or bad size */
840
841 if ((utsp = malloc(ubytes)) == NULL)
842 return (-1);
843
844 if (read(P->asfd, utsp, ubytes) != ubytes) {
845 dprintf("Pgrab_core: failed to read NT_UTSNAME\n");
846 free(utsp);
847 return (-1);
848 }
849
850 if (_libproc_debug) {
851 dprintf("uts.sysname = \"%s\"\n", utsp->sysname);
852 dprintf("uts.nodename = \"%s\"\n", utsp->nodename);
853 dprintf("uts.release = \"%s\"\n", utsp->release);
854 dprintf("uts.version = \"%s\"\n", utsp->version);
855 dprintf("uts.machine = \"%s\"\n", utsp->machine);
856 }
857
858 core->core_uts = utsp;
859 return (0);
860 }
861
862 static int
note_content(struct ps_prochandle * P,size_t nbytes)863 note_content(struct ps_prochandle *P, size_t nbytes)
864 {
865 core_info_t *core = P->data;
866 core_content_t content;
867
868 if (sizeof (core->core_content) != nbytes)
869 return (-1);
870
871 if (read(P->asfd, &content, sizeof (content)) != sizeof (content))
872 return (-1);
873
874 core->core_content = content;
875
876 dprintf("core content = %llx\n", content);
877
878 return (0);
879 }
880
881 static int
note_cred(struct ps_prochandle * P,size_t nbytes)882 note_cred(struct ps_prochandle *P, size_t nbytes)
883 {
884 core_info_t *core = P->data;
885 prcred_t *pcrp;
886 int ngroups;
887 const size_t min_size = sizeof (prcred_t) - sizeof (gid_t);
888
889 /*
890 * We allow for prcred_t notes that are actually smaller than a
891 * prcred_t since the last member isn't essential if there are
892 * no group memberships. This allows for more flexibility when it
893 * comes to slightly malformed -- but still valid -- notes.
894 */
895 if (core->core_cred != NULL || nbytes < min_size)
896 return (0); /* Already seen or bad size */
897
898 ngroups = (nbytes - min_size) / sizeof (gid_t);
899 nbytes = sizeof (prcred_t) + (ngroups - 1) * sizeof (gid_t);
900
901 if ((pcrp = malloc(nbytes)) == NULL)
902 return (-1);
903
904 if (read(P->asfd, pcrp, nbytes) != nbytes) {
905 dprintf("Pgrab_core: failed to read NT_PRCRED\n");
906 free(pcrp);
907 return (-1);
908 }
909
910 if (pcrp->pr_ngroups > ngroups) {
911 dprintf("pr_ngroups = %d; resetting to %d based on note size\n",
912 pcrp->pr_ngroups, ngroups);
913 pcrp->pr_ngroups = ngroups;
914 }
915
916 core->core_cred = pcrp;
917 return (0);
918 }
919
920 #ifdef __x86
921 static int
note_ldt(struct ps_prochandle * P,size_t nbytes)922 note_ldt(struct ps_prochandle *P, size_t nbytes)
923 {
924 core_info_t *core = P->data;
925 struct ssd *pldt;
926 uint_t nldt;
927
928 if (core->core_ldt != NULL || nbytes < sizeof (struct ssd))
929 return (0); /* Already seen or bad size */
930
931 nldt = nbytes / sizeof (struct ssd);
932 nbytes = nldt * sizeof (struct ssd);
933
934 if ((pldt = malloc(nbytes)) == NULL)
935 return (-1);
936
937 if (read(P->asfd, pldt, nbytes) != nbytes) {
938 dprintf("Pgrab_core: failed to read NT_LDT\n");
939 free(pldt);
940 return (-1);
941 }
942
943 core->core_ldt = pldt;
944 core->core_nldt = nldt;
945 return (0);
946 }
947 #endif /* __i386 */
948
949 static int
note_priv(struct ps_prochandle * P,size_t nbytes)950 note_priv(struct ps_prochandle *P, size_t nbytes)
951 {
952 core_info_t *core = P->data;
953 prpriv_t *pprvp;
954
955 if (core->core_priv != NULL || nbytes < sizeof (prpriv_t))
956 return (0); /* Already seen or bad size */
957
958 if ((pprvp = malloc(nbytes)) == NULL)
959 return (-1);
960
961 if (read(P->asfd, pprvp, nbytes) != nbytes) {
962 dprintf("Pgrab_core: failed to read NT_PRPRIV\n");
963 free(pprvp);
964 return (-1);
965 }
966
967 core->core_priv = pprvp;
968 core->core_priv_size = nbytes;
969 return (0);
970 }
971
972 static int
note_priv_info(struct ps_prochandle * P,size_t nbytes)973 note_priv_info(struct ps_prochandle *P, size_t nbytes)
974 {
975 core_info_t *core = P->data;
976 extern void *__priv_parse_info();
977 priv_impl_info_t *ppii;
978
979 if (core->core_privinfo != NULL ||
980 nbytes < sizeof (priv_impl_info_t))
981 return (0); /* Already seen or bad size */
982
983 if ((ppii = malloc(nbytes)) == NULL)
984 return (-1);
985
986 if (read(P->asfd, ppii, nbytes) != nbytes ||
987 PRIV_IMPL_INFO_SIZE(ppii) != nbytes) {
988 dprintf("Pgrab_core: failed to read NT_PRPRIVINFO\n");
989 free(ppii);
990 return (-1);
991 }
992
993 core->core_privinfo = __priv_parse_info(ppii);
994 core->core_ppii = ppii;
995 return (0);
996 }
997
998 static int
note_zonename(struct ps_prochandle * P,size_t nbytes)999 note_zonename(struct ps_prochandle *P, size_t nbytes)
1000 {
1001 core_info_t *core = P->data;
1002 char *zonename;
1003
1004 if (core->core_zonename != NULL)
1005 return (0); /* Already seen */
1006
1007 if (nbytes != 0) {
1008 if ((zonename = malloc(nbytes)) == NULL)
1009 return (-1);
1010 if (read(P->asfd, zonename, nbytes) != nbytes) {
1011 dprintf("Pgrab_core: failed to read NT_ZONENAME\n");
1012 free(zonename);
1013 return (-1);
1014 }
1015 zonename[nbytes - 1] = '\0';
1016 core->core_zonename = zonename;
1017 }
1018
1019 return (0);
1020 }
1021
1022 static int
note_auxv(struct ps_prochandle * P,size_t nbytes)1023 note_auxv(struct ps_prochandle *P, size_t nbytes)
1024 {
1025 size_t n, i;
1026
1027 #ifdef _LP64
1028 core_info_t *core = P->data;
1029
1030 if (core->core_dmodel == PR_MODEL_ILP32) {
1031 auxv32_t *a32;
1032
1033 n = nbytes / sizeof (auxv32_t);
1034 nbytes = n * sizeof (auxv32_t);
1035 a32 = alloca(nbytes);
1036
1037 if (read(P->asfd, a32, nbytes) != nbytes) {
1038 dprintf("Pgrab_core: failed to read NT_AUXV\n");
1039 return (-1);
1040 }
1041
1042 if ((P->auxv = malloc(sizeof (auxv_t) * (n + 1))) == NULL)
1043 return (-1);
1044
1045 for (i = 0; i < n; i++)
1046 auxv_32_to_n(&a32[i], &P->auxv[i]);
1047
1048 } else {
1049 #endif
1050 n = nbytes / sizeof (auxv_t);
1051 nbytes = n * sizeof (auxv_t);
1052
1053 if ((P->auxv = malloc(nbytes + sizeof (auxv_t))) == NULL)
1054 return (-1);
1055
1056 if (read(P->asfd, P->auxv, nbytes) != nbytes) {
1057 free(P->auxv);
1058 P->auxv = NULL;
1059 return (-1);
1060 }
1061 #ifdef _LP64
1062 }
1063 #endif
1064
1065 if (_libproc_debug) {
1066 for (i = 0; i < n; i++) {
1067 dprintf("P->auxv[%lu] = ( %d, 0x%lx )\n", (ulong_t)i,
1068 P->auxv[i].a_type, P->auxv[i].a_un.a_val);
1069 }
1070 }
1071
1072 /*
1073 * Defensive coding for loops which depend upon the auxv array being
1074 * terminated by an AT_NULL element; in each case, we've allocated
1075 * P->auxv to have an additional element which we force to be AT_NULL.
1076 */
1077 P->auxv[n].a_type = AT_NULL;
1078 P->auxv[n].a_un.a_val = 0L;
1079 P->nauxv = (int)n;
1080
1081 return (0);
1082 }
1083
1084 /*
1085 * The xregs are not a fixed size on all architectures (notably x86) and in
1086 * general the prxregset_t has become opaque to deal with this. This means that
1087 * validating the note itself can be a little more challenging. Especially as
1088 * this can change across time. In this case we require that our consumers
1089 * perform this validation.
1090 */
1091 static int
note_xreg(struct ps_prochandle * P,size_t nbytes)1092 note_xreg(struct ps_prochandle *P, size_t nbytes)
1093 {
1094 core_info_t *core = P->data;
1095 lwp_info_t *lwp = core->core_lwp;
1096 prxregset_t *xregs;
1097 ssize_t sret;
1098
1099 if (lwp == NULL || lwp->lwp_xregs != NULL)
1100 return (0); /* No lwp yet, already seen, or bad size */
1101
1102 if ((xregs = malloc(nbytes)) == NULL)
1103 return (-1);
1104
1105 sret = read(P->asfd, xregs, nbytes);
1106 if (sret < 0 || (size_t)sret != nbytes) {
1107 dprintf("Pgrab_core: failed to read NT_PRXREG\n");
1108 free(xregs);
1109 return (-1);
1110 }
1111
1112 lwp->lwp_xregs = xregs;
1113 lwp->lwp_xregsize = nbytes;
1114 return (0);
1115 }
1116
1117 #ifdef __sparc
1118 static int
note_gwindows(struct ps_prochandle * P,size_t nbytes)1119 note_gwindows(struct ps_prochandle *P, size_t nbytes)
1120 {
1121 core_info_t *core = P->data;
1122 lwp_info_t *lwp = core->core_lwp;
1123
1124 if (lwp == NULL || lwp->lwp_gwins != NULL || nbytes == 0)
1125 return (0); /* No lwp yet or already seen or no data */
1126
1127 if ((lwp->lwp_gwins = malloc(sizeof (gwindows_t))) == NULL)
1128 return (-1);
1129
1130 /*
1131 * Since the amount of gwindows data varies with how many windows were
1132 * actually saved, we just read up to the minimum of the note size
1133 * and the size of the gwindows_t type. It doesn't matter if the read
1134 * fails since we have to zero out gwindows first anyway.
1135 */
1136 #ifdef _LP64
1137 if (core->core_dmodel == PR_MODEL_ILP32) {
1138 gwindows32_t g32;
1139
1140 (void) memset(&g32, 0, sizeof (g32));
1141 (void) read(P->asfd, &g32, MIN(nbytes, sizeof (g32)));
1142 gwindows_32_to_n(&g32, lwp->lwp_gwins);
1143
1144 } else {
1145 #endif
1146 (void) memset(lwp->lwp_gwins, 0, sizeof (gwindows_t));
1147 (void) read(P->asfd, lwp->lwp_gwins,
1148 MIN(nbytes, sizeof (gwindows_t)));
1149 #ifdef _LP64
1150 }
1151 #endif
1152 return (0);
1153 }
1154
1155 #ifdef __sparcv9
1156 static int
note_asrs(struct ps_prochandle * P,size_t nbytes)1157 note_asrs(struct ps_prochandle *P, size_t nbytes)
1158 {
1159 core_info_t *core = P->data;
1160 lwp_info_t *lwp = core->core_lwp;
1161 int64_t *asrs;
1162
1163 if (lwp == NULL || lwp->lwp_asrs != NULL || nbytes < sizeof (asrset_t))
1164 return (0); /* No lwp yet, already seen, or bad size */
1165
1166 if ((asrs = malloc(sizeof (asrset_t))) == NULL)
1167 return (-1);
1168
1169 if (read(P->asfd, asrs, sizeof (asrset_t)) != sizeof (asrset_t)) {
1170 dprintf("Pgrab_core: failed to read NT_ASRS\n");
1171 free(asrs);
1172 return (-1);
1173 }
1174
1175 lwp->lwp_asrs = asrs;
1176 return (0);
1177 }
1178 #endif /* __sparcv9 */
1179 #endif /* __sparc */
1180
1181 static int
note_spymaster(struct ps_prochandle * P,size_t nbytes)1182 note_spymaster(struct ps_prochandle *P, size_t nbytes)
1183 {
1184 #ifdef _LP64
1185 core_info_t *core = P->data;
1186
1187 if (core->core_dmodel == PR_MODEL_ILP32) {
1188 psinfo32_t ps32;
1189
1190 if (nbytes < sizeof (psinfo32_t) ||
1191 read(P->asfd, &ps32, sizeof (ps32)) != sizeof (ps32))
1192 goto err;
1193
1194 psinfo_32_to_n(&ps32, &P->spymaster);
1195 } else
1196 #endif
1197 if (nbytes < sizeof (psinfo_t) || read(P->asfd,
1198 &P->spymaster, sizeof (psinfo_t)) != sizeof (psinfo_t))
1199 goto err;
1200
1201 dprintf("spymaster pr_fname = <%s>\n", P->psinfo.pr_fname);
1202 dprintf("spymaster pr_psargs = <%s>\n", P->psinfo.pr_psargs);
1203 dprintf("spymaster pr_wstat = 0x%x\n", P->psinfo.pr_wstat);
1204
1205 return (0);
1206
1207 err:
1208 dprintf("Pgrab_core: failed to read NT_SPYMASTER\n");
1209 return (-1);
1210 }
1211
1212 static int
note_upanic(struct ps_prochandle * P,size_t nbytes)1213 note_upanic(struct ps_prochandle *P, size_t nbytes)
1214 {
1215 core_info_t *core = P->data;
1216 prupanic_t *pru;
1217
1218 if (core->core_upanic != NULL)
1219 return (0);
1220
1221 if (sizeof (*pru) != nbytes) {
1222 dprintf("Pgrab_core: NT_UPANIC changed size."
1223 " Need to handle a version change?\n");
1224 return (-1);
1225 }
1226
1227 if (nbytes != 0 && ((pru = malloc(nbytes)) != NULL)) {
1228 if (read(P->asfd, pru, nbytes) != nbytes) {
1229 dprintf("Pgrab_core: failed to read NT_UPANIC\n");
1230 free(pru);
1231 return (-1);
1232 }
1233
1234 core->core_upanic = pru;
1235 }
1236
1237 return (0);
1238 }
1239
1240 /*ARGSUSED*/
1241 static int
note_notsup(struct ps_prochandle * P,size_t nbytes)1242 note_notsup(struct ps_prochandle *P, size_t nbytes)
1243 {
1244 dprintf("skipping unsupported note type of size %ld bytes\n",
1245 (ulong_t)nbytes);
1246 return (0);
1247 }
1248
1249 /*
1250 * Populate a table of function pointers indexed by Note type with our
1251 * functions to process each type of core file note:
1252 */
1253 static int (*nhdlrs[])(struct ps_prochandle *, size_t) = {
1254 note_notsup, /* 0 unassigned */
1255 #ifdef __x86
1256 note_linux_prstatus, /* 1 NT_PRSTATUS (old) */
1257 #else
1258 note_notsup, /* 1 NT_PRSTATUS (old) */
1259 #endif
1260 note_notsup, /* 2 NT_PRFPREG (old) */
1261 #ifdef __x86
1262 note_linux_psinfo, /* 3 NT_PRPSINFO (old) */
1263 #else
1264 note_notsup, /* 3 NT_PRPSINFO (old) */
1265 #endif
1266 note_xreg, /* 4 NT_PRXREG */
1267 note_platform, /* 5 NT_PLATFORM */
1268 note_auxv, /* 6 NT_AUXV */
1269 #ifdef __sparc
1270 note_gwindows, /* 7 NT_GWINDOWS */
1271 #ifdef __sparcv9
1272 note_asrs, /* 8 NT_ASRS */
1273 #else
1274 note_notsup, /* 8 NT_ASRS */
1275 #endif
1276 #else
1277 note_notsup, /* 7 NT_GWINDOWS */
1278 note_notsup, /* 8 NT_ASRS */
1279 #endif
1280 #ifdef __x86
1281 note_ldt, /* 9 NT_LDT */
1282 #else
1283 note_notsup, /* 9 NT_LDT */
1284 #endif
1285 note_pstatus, /* 10 NT_PSTATUS */
1286 note_notsup, /* 11 unassigned */
1287 note_notsup, /* 12 unassigned */
1288 note_psinfo, /* 13 NT_PSINFO */
1289 note_cred, /* 14 NT_PRCRED */
1290 note_utsname, /* 15 NT_UTSNAME */
1291 note_lwpstatus, /* 16 NT_LWPSTATUS */
1292 note_lwpsinfo, /* 17 NT_LWPSINFO */
1293 note_priv, /* 18 NT_PRPRIV */
1294 note_priv_info, /* 19 NT_PRPRIVINFO */
1295 note_content, /* 20 NT_CONTENT */
1296 note_zonename, /* 21 NT_ZONENAME */
1297 note_fdinfo, /* 22 NT_FDINFO */
1298 note_spymaster, /* 23 NT_SPYMASTER */
1299 note_secflags, /* 24 NT_SECFLAGS */
1300 note_lwpname, /* 25 NT_LWPNAME */
1301 note_upanic /* 26 NT_UPANIC */
1302 };
1303
1304 static void
core_report_mapping(struct ps_prochandle * P,GElf_Phdr * php)1305 core_report_mapping(struct ps_prochandle *P, GElf_Phdr *php)
1306 {
1307 prkillinfo_t killinfo;
1308 siginfo_t *si = &killinfo.prk_info;
1309 char signame[SIG2STR_MAX], sig[64], info[64];
1310 void *addr = (void *)(uintptr_t)php->p_vaddr;
1311
1312 const char *errfmt = "core file data for mapping at %p not saved: %s\n";
1313 const char *incfmt = "core file incomplete due to %s%s\n";
1314 const char *msgfmt = "mappings at and above %p are missing\n";
1315
1316 if (!(php->p_flags & PF_SUNW_KILLED)) {
1317 int err = 0;
1318
1319 (void) pread64(P->asfd, &err,
1320 sizeof (err), (off64_t)php->p_offset);
1321
1322 Perror_printf(P, errfmt, addr, strerror(err));
1323 dprintf(errfmt, addr, strerror(err));
1324 return;
1325 }
1326
1327 if (!(php->p_flags & PF_SUNW_SIGINFO))
1328 return;
1329
1330 (void) memset(&killinfo, 0, sizeof (killinfo));
1331
1332 (void) pread64(P->asfd, &killinfo,
1333 sizeof (killinfo), (off64_t)php->p_offset);
1334
1335 /*
1336 * While there is (or at least should be) only one segment that has
1337 * PF_SUNW_SIGINFO set, the signal information there is globally
1338 * useful (even if only to those debugging libproc consumers); we hang
1339 * the signal information gleaned here off of the ps_prochandle.
1340 */
1341 P->map_missing = php->p_vaddr;
1342 P->killinfo = killinfo.prk_info;
1343
1344 if (sig2str(si->si_signo, signame) == -1) {
1345 (void) snprintf(sig, sizeof (sig),
1346 "<Unknown signal: 0x%x>, ", si->si_signo);
1347 } else {
1348 (void) snprintf(sig, sizeof (sig), "SIG%s, ", signame);
1349 }
1350
1351 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) {
1352 (void) snprintf(info, sizeof (info),
1353 "pid=%d uid=%d zone=%d ctid=%d",
1354 si->si_pid, si->si_uid, si->si_zoneid, si->si_ctid);
1355 } else {
1356 (void) snprintf(info, sizeof (info),
1357 "code=%d", si->si_code);
1358 }
1359
1360 Perror_printf(P, incfmt, sig, info);
1361 Perror_printf(P, msgfmt, addr);
1362
1363 dprintf(incfmt, sig, info);
1364 dprintf(msgfmt, addr);
1365 }
1366
1367 /*
1368 * Add information on the address space mapping described by the given
1369 * PT_LOAD program header. We fill in more information on the mapping later.
1370 */
1371 static int
core_add_mapping(struct ps_prochandle * P,GElf_Phdr * php)1372 core_add_mapping(struct ps_prochandle *P, GElf_Phdr *php)
1373 {
1374 core_info_t *core = P->data;
1375 prmap_t pmap;
1376
1377 dprintf("mapping base %llx filesz %llx memsz %llx offset %llx\n",
1378 (u_longlong_t)php->p_vaddr, (u_longlong_t)php->p_filesz,
1379 (u_longlong_t)php->p_memsz, (u_longlong_t)php->p_offset);
1380
1381 pmap.pr_vaddr = (uintptr_t)php->p_vaddr;
1382 pmap.pr_size = php->p_memsz;
1383
1384 /*
1385 * If Pgcore() or elfcore() fail to write a mapping, they will set
1386 * PF_SUNW_FAILURE in the Phdr and try to stash away the errno for us.
1387 */
1388 if (php->p_flags & PF_SUNW_FAILURE) {
1389 core_report_mapping(P, php);
1390 } else if (php->p_filesz != 0 && php->p_offset >= core->core_size) {
1391 Perror_printf(P, "core file may be corrupt -- data for mapping "
1392 "at %p is missing\n", (void *)(uintptr_t)php->p_vaddr);
1393 dprintf("core file may be corrupt -- data for mapping "
1394 "at %p is missing\n", (void *)(uintptr_t)php->p_vaddr);
1395 }
1396
1397 /*
1398 * The mapping name and offset will hopefully be filled in
1399 * by the librtld_db agent. Unfortunately, if it isn't a
1400 * shared library mapping, this information is gone forever.
1401 */
1402 pmap.pr_mapname[0] = '\0';
1403 pmap.pr_offset = 0;
1404
1405 pmap.pr_mflags = 0;
1406 if (php->p_flags & PF_R)
1407 pmap.pr_mflags |= MA_READ;
1408 if (php->p_flags & PF_W)
1409 pmap.pr_mflags |= MA_WRITE;
1410 if (php->p_flags & PF_X)
1411 pmap.pr_mflags |= MA_EXEC;
1412
1413 if (php->p_filesz == 0)
1414 pmap.pr_mflags |= MA_RESERVED1;
1415
1416 /*
1417 * At the time of adding this mapping, we just zero the pagesize.
1418 * Once we've processed more of the core file, we'll have the
1419 * pagesize from the auxv's AT_PAGESZ element and we can fill this in.
1420 */
1421 pmap.pr_pagesize = 0;
1422
1423 /*
1424 * Unfortunately whether or not the mapping was a System V
1425 * shared memory segment is lost. We use -1 to mark it as not shm.
1426 */
1427 pmap.pr_shmid = -1;
1428
1429 return (Padd_mapping(P, php->p_offset, NULL, &pmap));
1430 }
1431
1432 /*
1433 * Given a virtual address, name the mapping at that address using the
1434 * specified name, and return the map_info_t pointer.
1435 */
1436 static map_info_t *
core_name_mapping(struct ps_prochandle * P,uintptr_t addr,const char * name)1437 core_name_mapping(struct ps_prochandle *P, uintptr_t addr, const char *name)
1438 {
1439 map_info_t *mp = Paddr2mptr(P, addr);
1440
1441 if (mp != NULL) {
1442 (void) strncpy(mp->map_pmap.pr_mapname, name, PRMAPSZ);
1443 mp->map_pmap.pr_mapname[PRMAPSZ - 1] = '\0';
1444 }
1445
1446 return (mp);
1447 }
1448
1449 /*
1450 * libproc uses libelf for all of its symbol table manipulation. This function
1451 * takes a symbol table and string table from a core file and places them
1452 * in a memory backed elf file.
1453 */
1454 static void
fake_up_symtab(struct ps_prochandle * P,const elf_file_header_t * ehdr,GElf_Shdr * symtab,GElf_Shdr * strtab)1455 fake_up_symtab(struct ps_prochandle *P, const elf_file_header_t *ehdr,
1456 GElf_Shdr *symtab, GElf_Shdr *strtab)
1457 {
1458 size_t size;
1459 off64_t off, base;
1460 map_info_t *mp;
1461 file_info_t *fp;
1462 Elf_Scn *scn;
1463 Elf_Data *data;
1464
1465 if (symtab->sh_addr == 0 ||
1466 (mp = Paddr2mptr(P, symtab->sh_addr)) == NULL ||
1467 (fp = mp->map_file) == NULL) {
1468 dprintf("fake_up_symtab: invalid section\n");
1469 return;
1470 }
1471
1472 if (fp->file_symtab.sym_data_pri != NULL) {
1473 dprintf("Symbol table already loaded (sh_addr 0x%lx)\n",
1474 (long)symtab->sh_addr);
1475 return;
1476 }
1477
1478 if (P->status.pr_dmodel == PR_MODEL_ILP32) {
1479 struct {
1480 Elf32_Ehdr ehdr;
1481 Elf32_Shdr shdr[3];
1482 char data[1];
1483 } *b;
1484
1485 base = sizeof (b->ehdr) + sizeof (b->shdr);
1486 size = base + symtab->sh_size + strtab->sh_size;
1487
1488 if ((b = calloc(1, size)) == NULL)
1489 return;
1490
1491 (void) memcpy(b->ehdr.e_ident, ehdr->e_ident,
1492 sizeof (ehdr->e_ident));
1493 b->ehdr.e_type = ehdr->e_type;
1494 b->ehdr.e_machine = ehdr->e_machine;
1495 b->ehdr.e_version = ehdr->e_version;
1496 b->ehdr.e_flags = ehdr->e_flags;
1497 b->ehdr.e_ehsize = sizeof (b->ehdr);
1498 b->ehdr.e_shoff = sizeof (b->ehdr);
1499 b->ehdr.e_shentsize = sizeof (b->shdr[0]);
1500 b->ehdr.e_shnum = 3;
1501 off = 0;
1502
1503 b->shdr[1].sh_size = symtab->sh_size;
1504 b->shdr[1].sh_type = SHT_SYMTAB;
1505 b->shdr[1].sh_offset = off + base;
1506 b->shdr[1].sh_entsize = sizeof (Elf32_Sym);
1507 b->shdr[1].sh_link = 2;
1508 b->shdr[1].sh_info = symtab->sh_info;
1509 b->shdr[1].sh_addralign = symtab->sh_addralign;
1510
1511 if (pread64(P->asfd, &b->data[off], b->shdr[1].sh_size,
1512 symtab->sh_offset) != b->shdr[1].sh_size) {
1513 dprintf("fake_up_symtab: pread of symtab[1] failed\n");
1514 free(b);
1515 return;
1516 }
1517
1518 off += b->shdr[1].sh_size;
1519
1520 b->shdr[2].sh_flags = SHF_STRINGS;
1521 b->shdr[2].sh_size = strtab->sh_size;
1522 b->shdr[2].sh_type = SHT_STRTAB;
1523 b->shdr[2].sh_offset = off + base;
1524 b->shdr[2].sh_info = strtab->sh_info;
1525 b->shdr[2].sh_addralign = 1;
1526
1527 if (pread64(P->asfd, &b->data[off], b->shdr[2].sh_size,
1528 strtab->sh_offset) != b->shdr[2].sh_size) {
1529 dprintf("fake_up_symtab: pread of symtab[2] failed\n");
1530 free(b);
1531 return;
1532 }
1533
1534 off += b->shdr[2].sh_size;
1535
1536 fp->file_symtab.sym_elf = elf_memory((char *)b, size);
1537 if (fp->file_symtab.sym_elf == NULL) {
1538 free(b);
1539 return;
1540 }
1541
1542 fp->file_symtab.sym_elfmem = b;
1543 #ifdef _LP64
1544 } else {
1545 struct {
1546 Elf64_Ehdr ehdr;
1547 Elf64_Shdr shdr[3];
1548 char data[1];
1549 } *b;
1550
1551 base = sizeof (b->ehdr) + sizeof (b->shdr);
1552 size = base + symtab->sh_size + strtab->sh_size;
1553
1554 if ((b = calloc(1, size)) == NULL)
1555 return;
1556
1557 (void) memcpy(b->ehdr.e_ident, ehdr->e_ident,
1558 sizeof (ehdr->e_ident));
1559 b->ehdr.e_type = ehdr->e_type;
1560 b->ehdr.e_machine = ehdr->e_machine;
1561 b->ehdr.e_version = ehdr->e_version;
1562 b->ehdr.e_flags = ehdr->e_flags;
1563 b->ehdr.e_ehsize = sizeof (b->ehdr);
1564 b->ehdr.e_shoff = sizeof (b->ehdr);
1565 b->ehdr.e_shentsize = sizeof (b->shdr[0]);
1566 b->ehdr.e_shnum = 3;
1567 off = 0;
1568
1569 b->shdr[1].sh_size = symtab->sh_size;
1570 b->shdr[1].sh_type = SHT_SYMTAB;
1571 b->shdr[1].sh_offset = off + base;
1572 b->shdr[1].sh_entsize = sizeof (Elf64_Sym);
1573 b->shdr[1].sh_link = 2;
1574 b->shdr[1].sh_info = symtab->sh_info;
1575 b->shdr[1].sh_addralign = symtab->sh_addralign;
1576
1577 if (pread64(P->asfd, &b->data[off], b->shdr[1].sh_size,
1578 symtab->sh_offset) != b->shdr[1].sh_size) {
1579 free(b);
1580 return;
1581 }
1582
1583 off += b->shdr[1].sh_size;
1584
1585 b->shdr[2].sh_flags = SHF_STRINGS;
1586 b->shdr[2].sh_size = strtab->sh_size;
1587 b->shdr[2].sh_type = SHT_STRTAB;
1588 b->shdr[2].sh_offset = off + base;
1589 b->shdr[2].sh_info = strtab->sh_info;
1590 b->shdr[2].sh_addralign = 1;
1591
1592 if (pread64(P->asfd, &b->data[off], b->shdr[2].sh_size,
1593 strtab->sh_offset) != b->shdr[2].sh_size) {
1594 free(b);
1595 return;
1596 }
1597
1598 off += b->shdr[2].sh_size;
1599
1600 fp->file_symtab.sym_elf = elf_memory((char *)b, size);
1601 if (fp->file_symtab.sym_elf == NULL) {
1602 free(b);
1603 return;
1604 }
1605
1606 fp->file_symtab.sym_elfmem = b;
1607 #endif
1608 }
1609
1610 if ((scn = elf_getscn(fp->file_symtab.sym_elf, 1)) == NULL ||
1611 (fp->file_symtab.sym_data_pri = elf_getdata(scn, NULL)) == NULL ||
1612 (scn = elf_getscn(fp->file_symtab.sym_elf, 2)) == NULL ||
1613 (data = elf_getdata(scn, NULL)) == NULL) {
1614 dprintf("fake_up_symtab: failed to get section data at %p\n",
1615 (void *)scn);
1616 goto err;
1617 }
1618
1619 fp->file_symtab.sym_strs = data->d_buf;
1620 fp->file_symtab.sym_strsz = data->d_size;
1621 fp->file_symtab.sym_symn = symtab->sh_size / symtab->sh_entsize;
1622 fp->file_symtab.sym_hdr_pri = *symtab;
1623 fp->file_symtab.sym_strhdr = *strtab;
1624
1625 optimize_symtab(&fp->file_symtab);
1626
1627 return;
1628 err:
1629 (void) elf_end(fp->file_symtab.sym_elf);
1630 free(fp->file_symtab.sym_elfmem);
1631 fp->file_symtab.sym_elf = NULL;
1632 fp->file_symtab.sym_elfmem = NULL;
1633 }
1634
1635 static void
core_phdr_to_gelf(const Elf32_Phdr * src,GElf_Phdr * dst)1636 core_phdr_to_gelf(const Elf32_Phdr *src, GElf_Phdr *dst)
1637 {
1638 dst->p_type = src->p_type;
1639 dst->p_flags = src->p_flags;
1640 dst->p_offset = (Elf64_Off)src->p_offset;
1641 dst->p_vaddr = (Elf64_Addr)src->p_vaddr;
1642 dst->p_paddr = (Elf64_Addr)src->p_paddr;
1643 dst->p_filesz = (Elf64_Xword)src->p_filesz;
1644 dst->p_memsz = (Elf64_Xword)src->p_memsz;
1645 dst->p_align = (Elf64_Xword)src->p_align;
1646 }
1647
1648 static void
core_shdr_to_gelf(const Elf32_Shdr * src,GElf_Shdr * dst)1649 core_shdr_to_gelf(const Elf32_Shdr *src, GElf_Shdr *dst)
1650 {
1651 dst->sh_name = src->sh_name;
1652 dst->sh_type = src->sh_type;
1653 dst->sh_flags = (Elf64_Xword)src->sh_flags;
1654 dst->sh_addr = (Elf64_Addr)src->sh_addr;
1655 dst->sh_offset = (Elf64_Off)src->sh_offset;
1656 dst->sh_size = (Elf64_Xword)src->sh_size;
1657 dst->sh_link = src->sh_link;
1658 dst->sh_info = src->sh_info;
1659 dst->sh_addralign = (Elf64_Xword)src->sh_addralign;
1660 dst->sh_entsize = (Elf64_Xword)src->sh_entsize;
1661 }
1662
1663 /*
1664 * Perform elf_begin on efp->e_fd and verify the ELF file's type and class.
1665 */
1666 static int
core_elf_fdopen(elf_file_t * efp,GElf_Half type,int * perr)1667 core_elf_fdopen(elf_file_t *efp, GElf_Half type, int *perr)
1668 {
1669 #ifdef _BIG_ENDIAN
1670 uchar_t order = ELFDATA2MSB;
1671 #else
1672 uchar_t order = ELFDATA2LSB;
1673 #endif
1674 Elf32_Ehdr e32;
1675 int is_noelf = -1;
1676 int isa_err = 0;
1677
1678 /*
1679 * Because 32-bit libelf cannot deal with large files, we need to read,
1680 * check, and convert the file header manually in case type == ET_CORE.
1681 */
1682 if (pread64(efp->e_fd, &e32, sizeof (e32), 0) != sizeof (e32)) {
1683 if (perr != NULL)
1684 *perr = G_FORMAT;
1685 goto err;
1686 }
1687 if ((is_noelf = memcmp(&e32.e_ident[EI_MAG0], ELFMAG, SELFMAG)) != 0 ||
1688 e32.e_type != type || (isa_err = (e32.e_ident[EI_DATA] != order)) ||
1689 e32.e_version != EV_CURRENT) {
1690 if (perr != NULL) {
1691 if (is_noelf == 0 && isa_err) {
1692 *perr = G_ISAINVAL;
1693 } else {
1694 *perr = G_FORMAT;
1695 }
1696 }
1697 goto err;
1698 }
1699
1700 /*
1701 * If the file is 64-bit and we are 32-bit, fail with G_LP64. If the
1702 * file is 64-bit and we are 64-bit, re-read the header as a Elf64_Ehdr,
1703 * and convert it to a elf_file_header_t. Otherwise, the file is
1704 * 32-bit, so convert e32 to a elf_file_header_t.
1705 */
1706 if (e32.e_ident[EI_CLASS] == ELFCLASS64) {
1707 #ifdef _LP64
1708 Elf64_Ehdr e64;
1709
1710 if (pread64(efp->e_fd, &e64, sizeof (e64), 0) != sizeof (e64)) {
1711 if (perr != NULL)
1712 *perr = G_FORMAT;
1713 goto err;
1714 }
1715
1716 (void) memcpy(efp->e_hdr.e_ident, e64.e_ident, EI_NIDENT);
1717 efp->e_hdr.e_type = e64.e_type;
1718 efp->e_hdr.e_machine = e64.e_machine;
1719 efp->e_hdr.e_version = e64.e_version;
1720 efp->e_hdr.e_entry = e64.e_entry;
1721 efp->e_hdr.e_phoff = e64.e_phoff;
1722 efp->e_hdr.e_shoff = e64.e_shoff;
1723 efp->e_hdr.e_flags = e64.e_flags;
1724 efp->e_hdr.e_ehsize = e64.e_ehsize;
1725 efp->e_hdr.e_phentsize = e64.e_phentsize;
1726 efp->e_hdr.e_phnum = (Elf64_Word)e64.e_phnum;
1727 efp->e_hdr.e_shentsize = e64.e_shentsize;
1728 efp->e_hdr.e_shnum = (Elf64_Word)e64.e_shnum;
1729 efp->e_hdr.e_shstrndx = (Elf64_Word)e64.e_shstrndx;
1730 #else /* _LP64 */
1731 if (perr != NULL)
1732 *perr = G_LP64;
1733 goto err;
1734 #endif /* _LP64 */
1735 } else {
1736 (void) memcpy(efp->e_hdr.e_ident, e32.e_ident, EI_NIDENT);
1737 efp->e_hdr.e_type = e32.e_type;
1738 efp->e_hdr.e_machine = e32.e_machine;
1739 efp->e_hdr.e_version = e32.e_version;
1740 efp->e_hdr.e_entry = (Elf64_Addr)e32.e_entry;
1741 efp->e_hdr.e_phoff = (Elf64_Off)e32.e_phoff;
1742 efp->e_hdr.e_shoff = (Elf64_Off)e32.e_shoff;
1743 efp->e_hdr.e_flags = e32.e_flags;
1744 efp->e_hdr.e_ehsize = e32.e_ehsize;
1745 efp->e_hdr.e_phentsize = e32.e_phentsize;
1746 efp->e_hdr.e_phnum = (Elf64_Word)e32.e_phnum;
1747 efp->e_hdr.e_shentsize = e32.e_shentsize;
1748 efp->e_hdr.e_shnum = (Elf64_Word)e32.e_shnum;
1749 efp->e_hdr.e_shstrndx = (Elf64_Word)e32.e_shstrndx;
1750 }
1751
1752 /*
1753 * If the number of section headers or program headers or the section
1754 * header string table index would overflow their respective fields
1755 * in the ELF header, they're stored in the section header at index
1756 * zero. To simplify use elsewhere, we look for those sentinel values
1757 * here.
1758 */
1759 if ((efp->e_hdr.e_shnum == 0 && efp->e_hdr.e_shoff != 0) ||
1760 efp->e_hdr.e_shstrndx == SHN_XINDEX ||
1761 efp->e_hdr.e_phnum == PN_XNUM) {
1762 GElf_Shdr shdr;
1763
1764 dprintf("extended ELF header\n");
1765
1766 if (efp->e_hdr.e_shoff == 0) {
1767 if (perr != NULL)
1768 *perr = G_FORMAT;
1769 goto err;
1770 }
1771
1772 if (efp->e_hdr.e_ident[EI_CLASS] == ELFCLASS32) {
1773 Elf32_Shdr shdr32;
1774
1775 if (pread64(efp->e_fd, &shdr32, sizeof (shdr32),
1776 efp->e_hdr.e_shoff) != sizeof (shdr32)) {
1777 if (perr != NULL)
1778 *perr = G_FORMAT;
1779 goto err;
1780 }
1781
1782 core_shdr_to_gelf(&shdr32, &shdr);
1783 } else {
1784 if (pread64(efp->e_fd, &shdr, sizeof (shdr),
1785 efp->e_hdr.e_shoff) != sizeof (shdr)) {
1786 if (perr != NULL)
1787 *perr = G_FORMAT;
1788 goto err;
1789 }
1790 }
1791
1792 if (efp->e_hdr.e_shnum == 0) {
1793 efp->e_hdr.e_shnum = shdr.sh_size;
1794 dprintf("section header count %lu\n",
1795 (ulong_t)shdr.sh_size);
1796 }
1797
1798 if (efp->e_hdr.e_shstrndx == SHN_XINDEX) {
1799 efp->e_hdr.e_shstrndx = shdr.sh_link;
1800 dprintf("section string index %u\n", shdr.sh_link);
1801 }
1802
1803 if (efp->e_hdr.e_phnum == PN_XNUM && shdr.sh_info != 0) {
1804 efp->e_hdr.e_phnum = shdr.sh_info;
1805 dprintf("program header count %u\n", shdr.sh_info);
1806 }
1807
1808 } else if (efp->e_hdr.e_phoff != 0) {
1809 GElf_Phdr phdr;
1810 uint64_t phnum;
1811
1812 /*
1813 * It's possible this core file came from a system that
1814 * accidentally truncated the e_phnum field without correctly
1815 * using the extended format in the section header at index
1816 * zero. We try to detect and correct that specific type of
1817 * corruption by using the knowledge that the core dump
1818 * routines usually place the data referenced by the first
1819 * program header immediately after the last header element.
1820 */
1821 if (efp->e_hdr.e_ident[EI_CLASS] == ELFCLASS32) {
1822 Elf32_Phdr phdr32;
1823
1824 if (pread64(efp->e_fd, &phdr32, sizeof (phdr32),
1825 efp->e_hdr.e_phoff) != sizeof (phdr32)) {
1826 if (perr != NULL)
1827 *perr = G_FORMAT;
1828 goto err;
1829 }
1830
1831 core_phdr_to_gelf(&phdr32, &phdr);
1832 } else {
1833 if (pread64(efp->e_fd, &phdr, sizeof (phdr),
1834 efp->e_hdr.e_phoff) != sizeof (phdr)) {
1835 if (perr != NULL)
1836 *perr = G_FORMAT;
1837 goto err;
1838 }
1839 }
1840
1841 phnum = phdr.p_offset - efp->e_hdr.e_ehsize -
1842 (uint64_t)efp->e_hdr.e_shnum * efp->e_hdr.e_shentsize;
1843 phnum /= efp->e_hdr.e_phentsize;
1844
1845 if (phdr.p_offset != 0 && phnum != efp->e_hdr.e_phnum) {
1846 dprintf("suspicious program header count %u %u\n",
1847 (uint_t)phnum, efp->e_hdr.e_phnum);
1848
1849 /*
1850 * If the new program header count we computed doesn't
1851 * jive with count in the ELF header, we'll use the
1852 * data that's there and hope for the best.
1853 *
1854 * If it does, it's also possible that the section
1855 * header offset is incorrect; we'll check that and
1856 * possibly try to fix it.
1857 */
1858 if (phnum <= INT_MAX &&
1859 (uint16_t)phnum == efp->e_hdr.e_phnum) {
1860
1861 if (efp->e_hdr.e_shoff == efp->e_hdr.e_phoff +
1862 efp->e_hdr.e_phentsize *
1863 (uint_t)efp->e_hdr.e_phnum) {
1864 efp->e_hdr.e_shoff =
1865 efp->e_hdr.e_phoff +
1866 efp->e_hdr.e_phentsize * phnum;
1867 }
1868
1869 efp->e_hdr.e_phnum = (Elf64_Word)phnum;
1870 dprintf("using new program header count\n");
1871 } else {
1872 dprintf("inconsistent program header count\n");
1873 }
1874 }
1875 }
1876
1877 /*
1878 * The libelf implementation was never ported to be large-file aware.
1879 * This is typically not a problem for your average executable or
1880 * shared library, but a large 32-bit core file can exceed 2GB in size.
1881 * So if type is ET_CORE, we don't bother doing elf_begin; the code
1882 * in Pfgrab_core() below will do its own i/o and struct conversion.
1883 */
1884
1885 if (type == ET_CORE) {
1886 efp->e_elf = NULL;
1887 return (0);
1888 }
1889
1890 if ((efp->e_elf = elf_begin(efp->e_fd, ELF_C_READ, NULL)) == NULL) {
1891 if (perr != NULL)
1892 *perr = G_ELF;
1893 goto err;
1894 }
1895
1896 return (0);
1897
1898 err:
1899 efp->e_elf = NULL;
1900 return (-1);
1901 }
1902
1903 /*
1904 * Open the specified file and then do a core_elf_fdopen on it.
1905 */
1906 static int
core_elf_open(elf_file_t * efp,const char * path,GElf_Half type,int * perr)1907 core_elf_open(elf_file_t *efp, const char *path, GElf_Half type, int *perr)
1908 {
1909 (void) memset(efp, 0, sizeof (elf_file_t));
1910
1911 if ((efp->e_fd = open64(path, O_RDONLY)) >= 0) {
1912 if (core_elf_fdopen(efp, type, perr) == 0)
1913 return (0);
1914
1915 (void) close(efp->e_fd);
1916 efp->e_fd = -1;
1917 }
1918
1919 return (-1);
1920 }
1921
1922 /*
1923 * Close the ELF handle and file descriptor.
1924 */
1925 static void
core_elf_close(elf_file_t * efp)1926 core_elf_close(elf_file_t *efp)
1927 {
1928 if (efp->e_elf != NULL) {
1929 (void) elf_end(efp->e_elf);
1930 efp->e_elf = NULL;
1931 }
1932
1933 if (efp->e_fd != -1) {
1934 (void) close(efp->e_fd);
1935 efp->e_fd = -1;
1936 }
1937 }
1938
1939 /*
1940 * Given an ELF file for a statically linked executable, locate the likely
1941 * primary text section and fill in rl_base with its virtual address.
1942 */
1943 static map_info_t *
core_find_text(struct ps_prochandle * P,Elf * elf,rd_loadobj_t * rlp)1944 core_find_text(struct ps_prochandle *P, Elf *elf, rd_loadobj_t *rlp)
1945 {
1946 GElf_Phdr phdr;
1947 uint_t i;
1948 size_t nphdrs;
1949
1950 if (elf_getphdrnum(elf, &nphdrs) == -1)
1951 return (NULL);
1952
1953 for (i = 0; i < nphdrs; i++) {
1954 if (gelf_getphdr(elf, i, &phdr) != NULL &&
1955 phdr.p_type == PT_LOAD && (phdr.p_flags & PF_X)) {
1956 rlp->rl_base = phdr.p_vaddr;
1957 return (Paddr2mptr(P, rlp->rl_base));
1958 }
1959 }
1960
1961 return (NULL);
1962 }
1963
1964 /*
1965 * Given an ELF file and the librtld_db structure corresponding to its primary
1966 * text mapping, deduce where its data segment was loaded and fill in
1967 * rl_data_base and prmap_t.pr_offset accordingly.
1968 */
1969 static map_info_t *
core_find_data(struct ps_prochandle * P,Elf * elf,rd_loadobj_t * rlp)1970 core_find_data(struct ps_prochandle *P, Elf *elf, rd_loadobj_t *rlp)
1971 {
1972 GElf_Ehdr ehdr;
1973 GElf_Phdr phdr;
1974 map_info_t *mp;
1975 uint_t i, pagemask;
1976 size_t nphdrs;
1977
1978 rlp->rl_data_base = (uintptr_t)NULL;
1979
1980 /*
1981 * Find the first loadable, writeable Phdr and compute rl_data_base
1982 * as the virtual address at which is was loaded.
1983 */
1984 if (gelf_getehdr(elf, &ehdr) == NULL ||
1985 elf_getphdrnum(elf, &nphdrs) == -1)
1986 return (NULL);
1987
1988 for (i = 0; i < nphdrs; i++) {
1989 if (gelf_getphdr(elf, i, &phdr) != NULL &&
1990 phdr.p_type == PT_LOAD && (phdr.p_flags & PF_W)) {
1991 rlp->rl_data_base = phdr.p_vaddr;
1992 if (ehdr.e_type == ET_DYN)
1993 rlp->rl_data_base += rlp->rl_base;
1994 break;
1995 }
1996 }
1997
1998 /*
1999 * If we didn't find an appropriate phdr or if the address we
2000 * computed has no mapping, return NULL.
2001 */
2002 if (rlp->rl_data_base == (uintptr_t)NULL ||
2003 (mp = Paddr2mptr(P, rlp->rl_data_base)) == NULL)
2004 return (NULL);
2005
2006 /*
2007 * It wouldn't be procfs-related code if we didn't make use of
2008 * unclean knowledge of segvn, even in userland ... the prmap_t's
2009 * pr_offset field will be the segvn offset from mmap(2)ing the
2010 * data section, which will be the file offset & PAGEMASK.
2011 */
2012 pagemask = ~(mp->map_pmap.pr_pagesize - 1);
2013 mp->map_pmap.pr_offset = phdr.p_offset & pagemask;
2014
2015 return (mp);
2016 }
2017
2018 /*
2019 * Librtld_db agent callback for iterating over load object mappings.
2020 * For each load object, we allocate a new file_info_t, perform naming,
2021 * and attempt to construct a symbol table for the load object.
2022 */
2023 static int
core_iter_mapping(const rd_loadobj_t * rlp,struct ps_prochandle * P)2024 core_iter_mapping(const rd_loadobj_t *rlp, struct ps_prochandle *P)
2025 {
2026 core_info_t *core = P->data;
2027 char lname[PATH_MAX], buf[PATH_MAX];
2028 file_info_t *fp;
2029 map_info_t *mp;
2030
2031 if (Pread_string(P, lname, PATH_MAX, (off_t)rlp->rl_nameaddr) <= 0) {
2032 dprintf("failed to read name %p\n", (void *)rlp->rl_nameaddr);
2033 return (1); /* Keep going; forget this if we can't get a name */
2034 }
2035
2036 dprintf("rd_loadobj name = \"%s\" rl_base = %p\n",
2037 lname, (void *)rlp->rl_base);
2038
2039 if ((mp = Paddr2mptr(P, rlp->rl_base)) == NULL) {
2040 dprintf("no mapping for %p\n", (void *)rlp->rl_base);
2041 return (1); /* No mapping; advance to next mapping */
2042 }
2043
2044 /*
2045 * Create a new file_info_t for this mapping, and therefore for
2046 * this load object.
2047 *
2048 * If there's an ELF header at the beginning of this mapping,
2049 * file_info_new() will try to use its section headers to
2050 * identify any other mappings that belong to this load object.
2051 */
2052 if ((fp = mp->map_file) == NULL &&
2053 (fp = file_info_new(P, mp)) == NULL) {
2054 core->core_errno = errno;
2055 dprintf("failed to malloc mapping data\n");
2056 return (0); /* Abort */
2057 }
2058 fp->file_map = mp;
2059
2060 /* Create a local copy of the load object representation */
2061 if ((fp->file_lo = calloc(1, sizeof (rd_loadobj_t))) == NULL) {
2062 core->core_errno = errno;
2063 dprintf("failed to malloc mapping data\n");
2064 return (0); /* Abort */
2065 }
2066 *fp->file_lo = *rlp;
2067
2068 if (lname[0] != '\0') {
2069 /*
2070 * Naming dance part 1: if we got a name from librtld_db, then
2071 * copy this name to the prmap_t if it is unnamed. If the
2072 * file_info_t is unnamed, name it after the lname.
2073 */
2074 if (mp->map_pmap.pr_mapname[0] == '\0') {
2075 (void) strncpy(mp->map_pmap.pr_mapname, lname, PRMAPSZ);
2076 mp->map_pmap.pr_mapname[PRMAPSZ - 1] = '\0';
2077 }
2078
2079 if (fp->file_lname == NULL)
2080 fp->file_lname = strdup(lname);
2081
2082 } else if (fp->file_lname == NULL &&
2083 mp->map_pmap.pr_mapname[0] != '\0') {
2084 /*
2085 * Naming dance part 2: if the mapping is named and the
2086 * file_info_t is not, name the file after the mapping.
2087 */
2088 fp->file_lname = strdup(mp->map_pmap.pr_mapname);
2089 }
2090
2091 if ((fp->file_rname == NULL) &&
2092 (Pfindmap(P, mp, buf, sizeof (buf)) != NULL))
2093 fp->file_rname = strdup(buf);
2094
2095 if (fp->file_lname != NULL)
2096 fp->file_lbase = basename(fp->file_lname);
2097 if (fp->file_rname != NULL)
2098 fp->file_rbase = basename(fp->file_rname);
2099
2100 /* Associate the file and the mapping. */
2101 (void) strncpy(fp->file_pname, mp->map_pmap.pr_mapname, PRMAPSZ);
2102 fp->file_pname[PRMAPSZ - 1] = '\0';
2103
2104 /*
2105 * If no section headers were available then we'll have to
2106 * identify this load object's other mappings with what we've
2107 * got: the start and end of the object's corresponding
2108 * address space.
2109 */
2110 if (fp->file_saddrs == NULL) {
2111 for (mp = fp->file_map + 1; mp < P->mappings + P->map_count &&
2112 mp->map_pmap.pr_vaddr < rlp->rl_bend; mp++) {
2113
2114 if (mp->map_file == NULL) {
2115 dprintf("core_iter_mapping %s: associating "
2116 "segment at %p\n",
2117 fp->file_pname,
2118 (void *)mp->map_pmap.pr_vaddr);
2119 mp->map_file = fp;
2120 fp->file_ref++;
2121 } else {
2122 dprintf("core_iter_mapping %s: segment at "
2123 "%p already associated with %s\n",
2124 fp->file_pname,
2125 (void *)mp->map_pmap.pr_vaddr,
2126 (mp == fp->file_map ? "this file" :
2127 mp->map_file->file_pname));
2128 }
2129 }
2130 }
2131
2132 /* Ensure that all this file's mappings are named. */
2133 for (mp = fp->file_map; mp < P->mappings + P->map_count &&
2134 mp->map_file == fp; mp++) {
2135 if (mp->map_pmap.pr_mapname[0] == '\0' &&
2136 !(mp->map_pmap.pr_mflags & MA_BREAK)) {
2137 (void) strncpy(mp->map_pmap.pr_mapname, fp->file_pname,
2138 PRMAPSZ);
2139 mp->map_pmap.pr_mapname[PRMAPSZ - 1] = '\0';
2140 }
2141 }
2142
2143 /* Attempt to build a symbol table for this file. */
2144 Pbuild_file_symtab(P, fp);
2145 if (fp->file_elf == NULL)
2146 dprintf("core_iter_mapping: no symtab for %s\n",
2147 fp->file_pname);
2148
2149 /* Locate the start of a data segment associated with this file. */
2150 if ((mp = core_find_data(P, fp->file_elf, fp->file_lo)) != NULL) {
2151 dprintf("found data for %s at %p (pr_offset 0x%llx)\n",
2152 fp->file_pname, (void *)fp->file_lo->rl_data_base,
2153 mp->map_pmap.pr_offset);
2154 } else {
2155 dprintf("core_iter_mapping: no data found for %s\n",
2156 fp->file_pname);
2157 }
2158
2159 return (1); /* Advance to next mapping */
2160 }
2161
2162 /*
2163 * Callback function for Pfindexec(). In order to confirm a given pathname,
2164 * we verify that we can open it as an ELF file of type ET_EXEC or ET_DYN.
2165 */
2166 static int
core_exec_open(const char * path,void * efp)2167 core_exec_open(const char *path, void *efp)
2168 {
2169 if (core_elf_open(efp, path, ET_EXEC, NULL) == 0)
2170 return (1);
2171 if (core_elf_open(efp, path, ET_DYN, NULL) == 0)
2172 return (1);
2173 return (0);
2174 }
2175
2176 /*
2177 * Attempt to load any section headers found in the core file. If present,
2178 * this will refer to non-loadable data added to the core file by the kernel
2179 * based on coreadm(8) settings, including CTF data and the symbol table.
2180 */
2181 static void
core_load_shdrs(struct ps_prochandle * P,elf_file_t * efp)2182 core_load_shdrs(struct ps_prochandle *P, elf_file_t *efp)
2183 {
2184 GElf_Shdr *shp, *shdrs = NULL;
2185 char *shstrtab = NULL;
2186 ulong_t shstrtabsz;
2187 const char *name;
2188 map_info_t *mp;
2189
2190 size_t nbytes;
2191 void *buf;
2192 int i;
2193
2194 if (efp->e_hdr.e_shstrndx >= efp->e_hdr.e_shnum) {
2195 dprintf("corrupt shstrndx (%u) exceeds shnum (%u)\n",
2196 efp->e_hdr.e_shstrndx, efp->e_hdr.e_shnum);
2197 return;
2198 }
2199
2200 /*
2201 * Read the section header table from the core file and then iterate
2202 * over the section headers, converting each to a GElf_Shdr.
2203 */
2204 if ((shdrs = malloc(efp->e_hdr.e_shnum * sizeof (GElf_Shdr))) == NULL) {
2205 dprintf("failed to malloc %u section headers: %s\n",
2206 (uint_t)efp->e_hdr.e_shnum, strerror(errno));
2207 return;
2208 }
2209
2210 nbytes = efp->e_hdr.e_shnum * efp->e_hdr.e_shentsize;
2211 if ((buf = malloc(nbytes)) == NULL) {
2212 dprintf("failed to malloc %d bytes: %s\n", (int)nbytes,
2213 strerror(errno));
2214 free(shdrs);
2215 goto out;
2216 }
2217
2218 if (pread64(efp->e_fd, buf, nbytes, efp->e_hdr.e_shoff) != nbytes) {
2219 dprintf("failed to read section headers at off %lld: %s\n",
2220 (longlong_t)efp->e_hdr.e_shoff, strerror(errno));
2221 free(buf);
2222 goto out;
2223 }
2224
2225 for (i = 0; i < efp->e_hdr.e_shnum; i++) {
2226 void *p = (uchar_t *)buf + efp->e_hdr.e_shentsize * i;
2227
2228 if (efp->e_hdr.e_ident[EI_CLASS] == ELFCLASS32)
2229 core_shdr_to_gelf(p, &shdrs[i]);
2230 else
2231 (void) memcpy(&shdrs[i], p, sizeof (GElf_Shdr));
2232 }
2233
2234 free(buf);
2235 buf = NULL;
2236
2237 /*
2238 * Read the .shstrtab section from the core file, terminating it with
2239 * an extra \0 so that a corrupt section will not cause us to die.
2240 */
2241 shp = &shdrs[efp->e_hdr.e_shstrndx];
2242 shstrtabsz = shp->sh_size;
2243
2244 if ((shstrtab = malloc(shstrtabsz + 1)) == NULL) {
2245 dprintf("failed to allocate %lu bytes for shstrtab\n",
2246 (ulong_t)shstrtabsz);
2247 goto out;
2248 }
2249
2250 if (pread64(efp->e_fd, shstrtab, shstrtabsz,
2251 shp->sh_offset) != shstrtabsz) {
2252 dprintf("failed to read %lu bytes of shstrs at off %lld: %s\n",
2253 shstrtabsz, (longlong_t)shp->sh_offset, strerror(errno));
2254 goto out;
2255 }
2256
2257 shstrtab[shstrtabsz] = '\0';
2258
2259 /*
2260 * Now iterate over each section in the section header table, locating
2261 * sections of interest and initializing more of the ps_prochandle.
2262 */
2263 for (i = 0; i < efp->e_hdr.e_shnum; i++) {
2264 shp = &shdrs[i];
2265 name = shstrtab + shp->sh_name;
2266
2267 if (shp->sh_name >= shstrtabsz) {
2268 dprintf("skipping section [%d]: corrupt sh_name\n", i);
2269 continue;
2270 }
2271
2272 if (shp->sh_link >= efp->e_hdr.e_shnum) {
2273 dprintf("skipping section [%d]: corrupt sh_link\n", i);
2274 continue;
2275 }
2276
2277 dprintf("found section header %s (sh_addr 0x%llx)\n",
2278 name, (u_longlong_t)shp->sh_addr);
2279
2280 if (strcmp(name, ".SUNW_ctf") == 0) {
2281 if ((mp = Paddr2mptr(P, shp->sh_addr)) == NULL) {
2282 dprintf("no map at addr 0x%llx for %s [%d]\n",
2283 (u_longlong_t)shp->sh_addr, name, i);
2284 continue;
2285 }
2286
2287 if (mp->map_file == NULL ||
2288 mp->map_file->file_ctf_buf != NULL) {
2289 dprintf("no mapping file or duplicate buffer "
2290 "for %s [%d]\n", name, i);
2291 continue;
2292 }
2293
2294 if ((buf = malloc(shp->sh_size)) == NULL ||
2295 pread64(efp->e_fd, buf, shp->sh_size,
2296 shp->sh_offset) != shp->sh_size) {
2297 dprintf("skipping section %s [%d]: %s\n",
2298 name, i, strerror(errno));
2299 free(buf);
2300 continue;
2301 }
2302
2303 mp->map_file->file_ctf_size = shp->sh_size;
2304 mp->map_file->file_ctf_buf = buf;
2305
2306 if (shdrs[shp->sh_link].sh_type == SHT_DYNSYM)
2307 mp->map_file->file_ctf_dyn = 1;
2308
2309 } else if (strcmp(name, ".symtab") == 0) {
2310 fake_up_symtab(P, &efp->e_hdr,
2311 shp, &shdrs[shp->sh_link]);
2312 }
2313 }
2314 out:
2315 free(shstrtab);
2316 free(shdrs);
2317 }
2318
2319 /*
2320 * Main engine for core file initialization: given an fd for the core file
2321 * and an optional pathname, construct the ps_prochandle. The aout_path can
2322 * either be a suggested executable pathname, or a suggested directory to
2323 * use as a possible current working directory.
2324 */
2325 struct ps_prochandle *
Pfgrab_core(int core_fd,const char * aout_path,int * perr)2326 Pfgrab_core(int core_fd, const char *aout_path, int *perr)
2327 {
2328 struct ps_prochandle *P;
2329 core_info_t *core_info;
2330 map_info_t *stk_mp, *brk_mp;
2331 const char *execname;
2332 char *interp;
2333 int i, notes, pagesize;
2334 uintptr_t addr, base_addr;
2335 struct stat64 stbuf;
2336 void *phbuf, *php;
2337 size_t nbytes;
2338 #ifdef __x86
2339 boolean_t from_linux = B_FALSE;
2340 #endif
2341
2342 elf_file_t aout;
2343 elf_file_t core;
2344
2345 Elf_Scn *scn, *intp_scn = NULL;
2346 Elf_Data *dp;
2347
2348 GElf_Phdr phdr, note_phdr;
2349 GElf_Shdr shdr;
2350 GElf_Xword nleft;
2351
2352 if (elf_version(EV_CURRENT) == EV_NONE) {
2353 dprintf("libproc ELF version is more recent than libelf\n");
2354 *perr = G_ELF;
2355 return (NULL);
2356 }
2357
2358 aout.e_elf = NULL;
2359 aout.e_fd = -1;
2360
2361 core.e_elf = NULL;
2362 core.e_fd = core_fd;
2363
2364 /*
2365 * Allocate and initialize a ps_prochandle structure for the core.
2366 * There are several key pieces of initialization here:
2367 *
2368 * 1. The PS_DEAD state flag marks this prochandle as a core file.
2369 * PS_DEAD also thus prevents all operations which require state
2370 * to be PS_STOP from operating on this handle.
2371 *
2372 * 2. We keep the core file fd in P->asfd since the core file contains
2373 * the remnants of the process address space.
2374 *
2375 * 3. We set the P->info_valid bit because all information about the
2376 * core is determined by the end of this function; there is no need
2377 * for proc_update_maps() to reload mappings at any later point.
2378 *
2379 * 4. The read/write ops vector uses our core_rw() function defined
2380 * above to handle i/o requests.
2381 */
2382 if ((P = malloc(sizeof (struct ps_prochandle))) == NULL) {
2383 *perr = G_STRANGE;
2384 return (NULL);
2385 }
2386
2387 (void) memset(P, 0, sizeof (struct ps_prochandle));
2388 (void) mutex_init(&P->proc_lock, USYNC_THREAD, NULL);
2389 P->state = PS_DEAD;
2390 P->pid = (pid_t)-1;
2391 P->asfd = core.e_fd;
2392 P->ctlfd = -1;
2393 P->statfd = -1;
2394 P->agentctlfd = -1;
2395 P->agentstatfd = -1;
2396 P->zoneroot = NULL;
2397 P->info_valid = 1;
2398 Pinit_ops(&P->ops, &P_core_ops);
2399
2400 Pinitsym(P);
2401 Pinitfd(P);
2402
2403 /*
2404 * Fstat and open the core file and make sure it is a valid ELF core.
2405 */
2406 if (fstat64(P->asfd, &stbuf) == -1) {
2407 *perr = G_STRANGE;
2408 goto err;
2409 }
2410
2411 if (core_elf_fdopen(&core, ET_CORE, perr) == -1)
2412 goto err;
2413
2414 /*
2415 * Allocate and initialize a core_info_t to hang off the ps_prochandle
2416 * structure. We keep all core-specific information in this structure.
2417 */
2418 if ((core_info = calloc(1, sizeof (core_info_t))) == NULL) {
2419 *perr = G_STRANGE;
2420 goto err;
2421 }
2422
2423 P->data = core_info;
2424 list_create(&core_info->core_lwp_head, sizeof (lwp_info_t),
2425 offsetof(lwp_info_t, lwp_list));
2426 core_info->core_size = stbuf.st_size;
2427 /*
2428 * In the days before adjustable core file content, this was the
2429 * default core file content. For new core files, this value will
2430 * be overwritten by the NT_CONTENT note section.
2431 */
2432 core_info->core_content = CC_CONTENT_STACK | CC_CONTENT_HEAP |
2433 CC_CONTENT_DATA | CC_CONTENT_RODATA | CC_CONTENT_ANON |
2434 CC_CONTENT_SHANON;
2435
2436 switch (core.e_hdr.e_ident[EI_CLASS]) {
2437 case ELFCLASS32:
2438 core_info->core_dmodel = PR_MODEL_ILP32;
2439 break;
2440 case ELFCLASS64:
2441 core_info->core_dmodel = PR_MODEL_LP64;
2442 break;
2443 default:
2444 *perr = G_FORMAT;
2445 goto err;
2446 }
2447 core_info->core_osabi = core.e_hdr.e_ident[EI_OSABI];
2448
2449 /*
2450 * Because the core file may be a large file, we can't use libelf to
2451 * read the Phdrs. We use e_phnum and e_phentsize to simplify things.
2452 */
2453 nbytes = core.e_hdr.e_phnum * core.e_hdr.e_phentsize;
2454
2455 if ((phbuf = malloc(nbytes)) == NULL) {
2456 *perr = G_STRANGE;
2457 goto err;
2458 }
2459
2460 if (pread64(core_fd, phbuf, nbytes, core.e_hdr.e_phoff) != nbytes) {
2461 *perr = G_STRANGE;
2462 free(phbuf);
2463 goto err;
2464 }
2465
2466 /*
2467 * Iterate through the program headers in the core file.
2468 * We're interested in two types of Phdrs: PT_NOTE (which
2469 * contains a set of saved /proc structures), and PT_LOAD (which
2470 * represents a memory mapping from the process's address space).
2471 * In the case of PT_NOTE, we're interested in the last PT_NOTE
2472 * in the core file; currently the first PT_NOTE (if present)
2473 * contains /proc structs in the pre-2.6 unstructured /proc format.
2474 */
2475 for (php = phbuf, notes = 0, i = 0; i < core.e_hdr.e_phnum; i++) {
2476 if (core.e_hdr.e_ident[EI_CLASS] == ELFCLASS64)
2477 (void) memcpy(&phdr, php, sizeof (GElf_Phdr));
2478 else
2479 core_phdr_to_gelf(php, &phdr);
2480
2481 switch (phdr.p_type) {
2482 case PT_NOTE:
2483 note_phdr = phdr;
2484 notes++;
2485 break;
2486
2487 case PT_LOAD:
2488 if (core_add_mapping(P, &phdr) == -1) {
2489 *perr = G_STRANGE;
2490 free(phbuf);
2491 goto err;
2492 }
2493 break;
2494 default:
2495 dprintf("Pgrab_core: unknown phdr %d\n", phdr.p_type);
2496 break;
2497 }
2498
2499 php = (char *)php + core.e_hdr.e_phentsize;
2500 }
2501
2502 free(phbuf);
2503
2504 Psort_mappings(P);
2505
2506 /*
2507 * If we couldn't find anything of type PT_NOTE, or only one PT_NOTE
2508 * was present, abort. The core file is either corrupt or too old.
2509 */
2510 if (notes == 0 || (notes == 1 && core_info->core_osabi ==
2511 ELFOSABI_SOLARIS)) {
2512 *perr = G_NOTE;
2513 goto err;
2514 }
2515
2516 /*
2517 * Advance the seek pointer to the start of the PT_NOTE data
2518 */
2519 if (lseek64(P->asfd, note_phdr.p_offset, SEEK_SET) == (off64_t)-1) {
2520 dprintf("Pgrab_core: failed to lseek to PT_NOTE data\n");
2521 *perr = G_STRANGE;
2522 goto err;
2523 }
2524
2525 /*
2526 * Now process the PT_NOTE structures. Each one is preceded by
2527 * an Elf{32/64}_Nhdr structure describing its type and size.
2528 *
2529 * +--------+
2530 * | header |
2531 * +--------+
2532 * | name |
2533 * | ... |
2534 * +--------+
2535 * | desc |
2536 * | ... |
2537 * +--------+
2538 */
2539 for (nleft = note_phdr.p_filesz; nleft > 0; ) {
2540 Elf64_Nhdr nhdr;
2541 off64_t off, namesz, descsz;
2542
2543 /*
2544 * Although <sys/elf.h> defines both Elf32_Nhdr and Elf64_Nhdr
2545 * as different types, they are both of the same content and
2546 * size, so we don't need to worry about 32/64 conversion here.
2547 */
2548 if (read(P->asfd, &nhdr, sizeof (nhdr)) != sizeof (nhdr)) {
2549 dprintf("Pgrab_core: failed to read ELF note header\n");
2550 *perr = G_NOTE;
2551 goto err;
2552 }
2553
2554 /*
2555 * According to the System V ABI, the amount of padding
2556 * following the name field should align the description
2557 * field on a 4 byte boundary for 32-bit binaries or on an 8
2558 * byte boundary for 64-bit binaries. However, this change
2559 * was not made correctly during the 64-bit port so all
2560 * descriptions can assume only 4-byte alignment. We ignore
2561 * the name field and the padding to 4-byte alignment.
2562 */
2563 namesz = P2ROUNDUP((off64_t)nhdr.n_namesz, (off64_t)4);
2564
2565 if (lseek64(P->asfd, namesz, SEEK_CUR) == (off64_t)-1) {
2566 dprintf("failed to seek past name and padding\n");
2567 *perr = G_STRANGE;
2568 goto err;
2569 }
2570
2571 dprintf("Note hdr n_type=%u n_namesz=%u n_descsz=%u\n",
2572 nhdr.n_type, nhdr.n_namesz, nhdr.n_descsz);
2573
2574 off = lseek64(P->asfd, (off64_t)0L, SEEK_CUR);
2575
2576 /*
2577 * Invoke the note handler function from our table
2578 */
2579 if (nhdr.n_type < sizeof (nhdlrs) / sizeof (nhdlrs[0])) {
2580 if (nhdlrs[nhdr.n_type](P, nhdr.n_descsz) < 0) {
2581 dprintf("handler for type %d returned < 0",
2582 nhdr.n_type);
2583 *perr = G_NOTE;
2584 goto err;
2585 }
2586 /*
2587 * The presence of either of these notes indicates that
2588 * the dump was generated on Linux.
2589 */
2590 #ifdef __x86
2591 if (nhdr.n_type == NT_PRSTATUS ||
2592 nhdr.n_type == NT_PRPSINFO)
2593 from_linux = B_TRUE;
2594 #endif
2595 } else {
2596 (void) note_notsup(P, nhdr.n_descsz);
2597 }
2598
2599 /*
2600 * Seek past the current note data to the next Elf_Nhdr
2601 */
2602 descsz = P2ROUNDUP((off64_t)nhdr.n_descsz, (off64_t)4);
2603 if (lseek64(P->asfd, off + descsz, SEEK_SET) == (off64_t)-1) {
2604 dprintf("Pgrab_core: failed to seek to next nhdr\n");
2605 *perr = G_STRANGE;
2606 goto err;
2607 }
2608
2609 /*
2610 * Subtract the size of the header and its data from what
2611 * we have left to process.
2612 */
2613 nleft -= sizeof (nhdr) + namesz + descsz;
2614 }
2615
2616 #ifdef __x86
2617 if (from_linux) {
2618 size_t pid;
2619 lwp_info_t *lwp;
2620
2621 P->status.pr_dmodel = core_info->core_dmodel;
2622
2623 pid = P->status.pr_pid;
2624
2625 for (lwp = list_head(&core_info->core_lwp_head); lwp != NULL;
2626 lwp = list_next(&core_info->core_lwp_head, lwp)) {
2627 dprintf("Linux thread with id %d\n", lwp->lwp_id);
2628
2629 /*
2630 * In the case we don't have a valid psinfo (i.e. pid is
2631 * 0, probably because of gdb creating the core) assume
2632 * lowest pid count is the first thread (what if the
2633 * next thread wraps the pid around?)
2634 */
2635 if (P->status.pr_pid == 0 &&
2636 ((pid == 0 && lwp->lwp_id > 0) ||
2637 (lwp->lwp_id < pid))) {
2638 pid = lwp->lwp_id;
2639 }
2640 }
2641
2642 if (P->status.pr_pid != pid) {
2643 dprintf("No valid pid, setting to %ld\n", (ulong_t)pid);
2644 P->status.pr_pid = pid;
2645 P->psinfo.pr_pid = pid;
2646 }
2647
2648 /*
2649 * Consumers like mdb expect the first thread to actually have
2650 * an id of 1, on linux that is actually the pid. Find the the
2651 * thread with our process id, and set the id to 1
2652 */
2653 if ((lwp = lwpid2info(P, pid)) == NULL) {
2654 dprintf("Couldn't find first thread\n");
2655 *perr = G_STRANGE;
2656 goto err;
2657 }
2658
2659 dprintf("setting representative thread: %d\n", lwp->lwp_id);
2660
2661 lwp->lwp_id = 1;
2662 lwp->lwp_status.pr_lwpid = 1;
2663
2664 /* set representative thread */
2665 (void) memcpy(&P->status.pr_lwp, &lwp->lwp_status,
2666 sizeof (P->status.pr_lwp));
2667 }
2668 #endif /* __x86 */
2669
2670 if (nleft != 0) {
2671 dprintf("Pgrab_core: note section malformed\n");
2672 *perr = G_STRANGE;
2673 goto err;
2674 }
2675
2676 if ((pagesize = Pgetauxval(P, AT_PAGESZ)) == -1) {
2677 pagesize = getpagesize();
2678 dprintf("AT_PAGESZ missing; defaulting to %d\n", pagesize);
2679 }
2680
2681 /*
2682 * Locate and label the mappings corresponding to the end of the
2683 * heap (MA_BREAK) and the base of the stack (MA_STACK).
2684 */
2685 if ((P->status.pr_brkbase != 0 || P->status.pr_brksize != 0) &&
2686 (brk_mp = Paddr2mptr(P, P->status.pr_brkbase +
2687 P->status.pr_brksize - 1)) != NULL)
2688 brk_mp->map_pmap.pr_mflags |= MA_BREAK;
2689 else
2690 brk_mp = NULL;
2691
2692 if ((stk_mp = Paddr2mptr(P, P->status.pr_stkbase)) != NULL)
2693 stk_mp->map_pmap.pr_mflags |= MA_STACK;
2694
2695 /*
2696 * At this point, we have enough information to look for the
2697 * executable and open it: we have access to the auxv, a psinfo_t,
2698 * and the ability to read from mappings provided by the core file.
2699 */
2700 (void) Pfindexec(P, aout_path, core_exec_open, &aout);
2701 dprintf("P->execname = \"%s\"\n", P->execname ? P->execname : "NULL");
2702 execname = P->execname ? P->execname : "a.out";
2703
2704 /*
2705 * Iterate through the sections, looking for the .dynamic and .interp
2706 * sections. If we encounter them, remember their section pointers.
2707 */
2708 for (scn = NULL; (scn = elf_nextscn(aout.e_elf, scn)) != NULL; ) {
2709 char *sname;
2710
2711 if ((gelf_getshdr(scn, &shdr) == NULL) ||
2712 (sname = elf_strptr(aout.e_elf, aout.e_hdr.e_shstrndx,
2713 (size_t)shdr.sh_name)) == NULL)
2714 continue;
2715
2716 if (strcmp(sname, ".interp") == 0)
2717 intp_scn = scn;
2718 }
2719
2720 /*
2721 * Get the AT_BASE auxv element. If this is missing (-1), then
2722 * we assume this is a statically-linked executable.
2723 */
2724 base_addr = Pgetauxval(P, AT_BASE);
2725
2726 /*
2727 * In order to get librtld_db initialized, we'll need to identify
2728 * and name the mapping corresponding to the run-time linker. The
2729 * AT_BASE auxv element tells us the address where it was mapped,
2730 * and the .interp section of the executable tells us its path.
2731 * If for some reason that doesn't pan out, just use ld.so.1.
2732 */
2733 if (intp_scn != NULL && (dp = elf_getdata(intp_scn, NULL)) != NULL &&
2734 dp->d_size != 0) {
2735 dprintf(".interp = <%s>\n", (char *)dp->d_buf);
2736 interp = dp->d_buf;
2737
2738 } else if (base_addr != (uintptr_t)-1L) {
2739 if (core_info->core_dmodel == PR_MODEL_LP64)
2740 interp = "/usr/lib/64/ld.so.1";
2741 else
2742 interp = "/usr/lib/ld.so.1";
2743
2744 dprintf(".interp section is missing or could not be read; "
2745 "defaulting to %s\n", interp);
2746 } else
2747 dprintf("detected statically linked executable\n");
2748
2749 /*
2750 * If we have an AT_BASE element, name the mapping at that address
2751 * using the interpreter pathname. Name the corresponding data
2752 * mapping after the interpreter as well.
2753 */
2754 if (base_addr != (uintptr_t)-1L) {
2755 elf_file_t intf;
2756
2757 P->map_ldso = core_name_mapping(P, base_addr, interp);
2758
2759 if (core_elf_open(&intf, interp, ET_DYN, NULL) == 0) {
2760 rd_loadobj_t rl;
2761 map_info_t *dmp;
2762
2763 rl.rl_base = base_addr;
2764 dmp = core_find_data(P, intf.e_elf, &rl);
2765
2766 if (dmp != NULL) {
2767 dprintf("renamed data at %p to %s\n",
2768 (void *)rl.rl_data_base, interp);
2769 (void) strncpy(dmp->map_pmap.pr_mapname,
2770 interp, PRMAPSZ);
2771 dmp->map_pmap.pr_mapname[PRMAPSZ - 1] = '\0';
2772 }
2773 }
2774
2775 core_elf_close(&intf);
2776 }
2777
2778 /*
2779 * If we have an AT_ENTRY element, name the mapping at that address
2780 * using the special name "a.out" just like /proc does.
2781 */
2782 if ((addr = Pgetauxval(P, AT_ENTRY)) != (uintptr_t)-1L)
2783 P->map_exec = core_name_mapping(P, addr, "a.out");
2784
2785 /*
2786 * If we're a statically linked executable (or we're on x86 and looking
2787 * at a Linux core dump), then just locate the executable's text and
2788 * data and name them after the executable.
2789 */
2790 #ifndef __x86
2791 if (base_addr == (uintptr_t)-1L) {
2792 #else
2793 if (base_addr == (uintptr_t)-1L || from_linux) {
2794 #endif
2795 dprintf("looking for text and data: %s\n", execname);
2796 map_info_t *tmp, *dmp;
2797 file_info_t *fp;
2798 rd_loadobj_t rl;
2799
2800 if ((tmp = core_find_text(P, aout.e_elf, &rl)) != NULL &&
2801 (dmp = core_find_data(P, aout.e_elf, &rl)) != NULL) {
2802 (void) strncpy(tmp->map_pmap.pr_mapname,
2803 execname, PRMAPSZ);
2804 tmp->map_pmap.pr_mapname[PRMAPSZ - 1] = '\0';
2805 (void) strncpy(dmp->map_pmap.pr_mapname,
2806 execname, PRMAPSZ);
2807 dmp->map_pmap.pr_mapname[PRMAPSZ - 1] = '\0';
2808 }
2809
2810 if ((P->map_exec = tmp) != NULL &&
2811 (fp = malloc(sizeof (file_info_t))) != NULL) {
2812
2813 (void) memset(fp, 0, sizeof (file_info_t));
2814
2815 list_insert_head(&P->file_head, fp);
2816 tmp->map_file = fp;
2817 P->num_files++;
2818
2819 fp->file_ref = 1;
2820 fp->file_fd = -1;
2821 fp->file_dbgfile = -1;
2822
2823 fp->file_lo = malloc(sizeof (rd_loadobj_t));
2824 fp->file_lname = strdup(execname);
2825
2826 if (fp->file_lo)
2827 *fp->file_lo = rl;
2828 if (fp->file_lname)
2829 fp->file_lbase = basename(fp->file_lname);
2830 if (fp->file_rname)
2831 fp->file_rbase = basename(fp->file_rname);
2832
2833 (void) strcpy(fp->file_pname,
2834 P->mappings[0].map_pmap.pr_mapname);
2835 fp->file_map = tmp;
2836
2837 Pbuild_file_symtab(P, fp);
2838
2839 if (dmp != NULL) {
2840 dmp->map_file = fp;
2841 fp->file_ref++;
2842 }
2843 }
2844 }
2845
2846 core_elf_close(&aout);
2847
2848 /*
2849 * We now have enough information to initialize librtld_db.
2850 * After it warms up, we can iterate through the load object chain
2851 * in the core, which will allow us to construct the file info
2852 * we need to provide symbol information for the other shared
2853 * libraries, and also to fill in the missing mapping names.
2854 */
2855 rd_log(_libproc_debug);
2856
2857 if ((P->rap = rd_new(P)) != NULL) {
2858 (void) rd_loadobj_iter(P->rap, (rl_iter_f *)
2859 core_iter_mapping, P);
2860
2861 if (core_info->core_errno != 0) {
2862 errno = core_info->core_errno;
2863 *perr = G_STRANGE;
2864 goto err;
2865 }
2866 } else
2867 dprintf("failed to initialize rtld_db agent\n");
2868
2869 /*
2870 * If there are sections, load them and process the data from any
2871 * sections that we can use to annotate the file_info_t's.
2872 */
2873 core_load_shdrs(P, &core);
2874
2875 /*
2876 * If we previously located a stack or break mapping, and they are
2877 * still anonymous, we now assume that they were MAP_ANON mappings.
2878 * If brk_mp turns out to now have a name, then the heap is still
2879 * sitting at the end of the executable's data+bss mapping: remove
2880 * the previous MA_BREAK setting to be consistent with /proc.
2881 */
2882 if (stk_mp != NULL && stk_mp->map_pmap.pr_mapname[0] == '\0')
2883 stk_mp->map_pmap.pr_mflags |= MA_ANON;
2884 if (brk_mp != NULL && brk_mp->map_pmap.pr_mapname[0] == '\0')
2885 brk_mp->map_pmap.pr_mflags |= MA_ANON;
2886 else if (brk_mp != NULL)
2887 brk_mp->map_pmap.pr_mflags &= ~MA_BREAK;
2888
2889 *perr = 0;
2890 return (P);
2891
2892 err:
2893 Pfree(P);
2894 core_elf_close(&aout);
2895 return (NULL);
2896 }
2897
2898 /*
2899 * Grab a core file using a pathname. We just open it and call Pfgrab_core().
2900 */
2901 struct ps_prochandle *
2902 Pgrab_core(const char *core, const char *aout, int gflag, int *perr)
2903 {
2904 int fd, oflag = (gflag & PGRAB_RDONLY) ? O_RDONLY : O_RDWR;
2905
2906 if ((fd = open64(core, oflag)) >= 0)
2907 return (Pfgrab_core(fd, aout, perr));
2908
2909 if (errno != ENOENT)
2910 *perr = G_STRANGE;
2911 else
2912 *perr = G_NOCORE;
2913
2914 return (NULL);
2915 }
2916
2917 int
2918 Pupanic(struct ps_prochandle *P, prupanic_t **pru)
2919 {
2920 core_info_t *core;
2921
2922 if (P->state != PS_DEAD) {
2923 errno = ENODATA;
2924 return (-1);
2925 }
2926
2927 core = P->data;
2928 if (core->core_upanic == NULL) {
2929 errno = ENOENT;
2930 return (-1);
2931 }
2932
2933 if (core->core_upanic->pru_version != PRUPANIC_VERSION_1) {
2934 errno = EINVAL;
2935 return (-1);
2936 }
2937
2938 if ((*pru = calloc(1, sizeof (prupanic_t))) == NULL)
2939 return (-1);
2940 (void) memcpy(*pru, core->core_upanic, sizeof (prupanic_t));
2941
2942 return (0);
2943 }
2944
2945 void
2946 Pupanic_free(prupanic_t *pru)
2947 {
2948 free(pru);
2949 }
2950