1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2017 Dell EMC
5 * Copyright (c) 2007 Sandvine Incorporated
6 * Copyright (c) 1998 John D. Polstra
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #include <sys/endian.h>
33 #include <sys/param.h>
34 #include <sys/procfs.h>
35 #include <sys/ptrace.h>
36 #include <sys/queue.h>
37 #include <sys/linker_set.h>
38 #include <sys/sbuf.h>
39 #include <sys/sysctl.h>
40 #include <sys/user.h>
41 #include <sys/wait.h>
42 #include <machine/elf.h>
43 #include <vm/vm_param.h>
44 #include <vm/vm.h>
45 #include <assert.h>
46 #include <err.h>
47 #include <errno.h>
48 #include <fcntl.h>
49 #include <stdbool.h>
50 #include <stdint.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55 #include <libutil.h>
56
57 #include "extern.h"
58
59 /*
60 * Code for generating ELF core dumps.
61 */
62
63 struct map_entry {
64 struct map_entry *next;
65 vm_offset_t start;
66 vm_offset_t end;
67 vm_prot_t protection;
68 };
69
70 typedef void (*segment_callback)(struct map_entry *, void *);
71
72 /* Closure for cb_put_phdr(). */
73 struct phdr_closure {
74 Elf_Phdr *phdr; /* Program header to fill in */
75 Elf_Off offset; /* Offset of segment in core file */
76 };
77
78 /* Closure for cb_size_segment(). */
79 struct sseg_closure {
80 int count; /* Count of writable segments. */
81 size_t size; /* Total size of all writable segments. */
82 };
83
84 #ifdef ELFCORE_COMPAT_32
85 typedef struct prpsinfo32 elfcore_prpsinfo_t;
86 #else
87 typedef prpsinfo_t elfcore_prpsinfo_t;
88 #endif
89
90 typedef void* (*notefunc_t)(void *, size_t *);
91
92 static void cb_put_phdr(struct map_entry *, void *);
93 static void cb_size_segment(struct map_entry *, void *);
94 static void each_dumpable_segment(struct map_entry *, segment_callback,
95 void *closure);
96 static void elf_detach(void); /* atexit() handler. */
97 static void *elf_note_prpsinfo(void *, size_t *);
98 #if defined(__i386__) || defined(__amd64__)
99 static void *elf_note_x86_xstate(void *, size_t *);
100 #endif
101 #if defined(__powerpc__)
102 static void *elf_note_powerpc_vmx(void *, size_t *);
103 static void *elf_note_powerpc_vsx(void *, size_t *);
104 #endif
105 static void *elf_note_procstat_auxv(void *, size_t *);
106 static void *elf_note_procstat_files(void *, size_t *);
107 static void *elf_note_procstat_groups(void *, size_t *);
108 static void *elf_note_procstat_osrel(void *, size_t *);
109 static void *elf_note_procstat_proc(void *, size_t *);
110 static void *elf_note_procstat_psstrings(void *, size_t *);
111 static void *elf_note_procstat_rlimit(void *, size_t *);
112 static void *elf_note_procstat_umask(void *, size_t *);
113 static void *elf_note_procstat_vmmap(void *, size_t *);
114 static void elf_puthdr(int, pid_t, struct map_entry *, void *, size_t, size_t,
115 size_t, int);
116 static void elf_putnote(int, notefunc_t, void *, struct sbuf *);
117 static void elf_putnotes(pid_t, struct sbuf *, size_t *);
118 static void elf_putregnote(int, lwpid_t, struct sbuf *);
119 static void freemap(struct map_entry *);
120 static struct map_entry *readmap(pid_t);
121 static void *procstat_sysctl(void *, int, size_t, size_t *sizep);
122
123 static pid_t g_pid; /* Pid being dumped, global for elf_detach */
124 static int g_status; /* proc status after ptrace attach */
125
126 static int
elf_ident(int efd,pid_t pid __unused,char * binfile __unused)127 elf_ident(int efd, pid_t pid __unused, char *binfile __unused)
128 {
129 Elf_Ehdr hdr;
130 int cnt;
131 uint16_t machine;
132
133 cnt = read(efd, &hdr, sizeof(hdr));
134 if (cnt != sizeof(hdr))
135 return (0);
136 if (!IS_ELF(hdr))
137 return (0);
138 switch (hdr.e_ident[EI_DATA]) {
139 case ELFDATA2LSB:
140 machine = le16toh(hdr.e_machine);
141 break;
142 case ELFDATA2MSB:
143 machine = be16toh(hdr.e_machine);
144 break;
145 default:
146 return (0);
147 }
148 if (!ELF_MACHINE_OK(machine))
149 return (0);
150
151 /* Looks good. */
152 return (1);
153 }
154
155 static void
elf_detach(void)156 elf_detach(void)
157 {
158 int sig;
159
160 if (g_pid != 0) {
161 /*
162 * Forward any pending signals. SIGSTOP is generated by ptrace
163 * itself, so ignore it.
164 */
165 sig = WIFSTOPPED(g_status) ? WSTOPSIG(g_status) : 0;
166 if (sig == SIGSTOP)
167 sig = 0;
168 ptrace(PT_DETACH, g_pid, (caddr_t)1, sig);
169 }
170 }
171
172 /*
173 * Write an ELF coredump for the given pid to the given fd.
174 */
175 static void
elf_coredump(int efd,int fd,pid_t pid)176 elf_coredump(int efd, int fd, pid_t pid)
177 {
178 struct map_entry *map;
179 struct sseg_closure seginfo;
180 struct sbuf *sb;
181 void *hdr;
182 size_t hdrsize, notesz, segoff;
183 ssize_t n, old_len;
184 Elf_Phdr *php;
185 int i;
186
187 /* Attach to process to dump. */
188 g_pid = pid;
189 if (atexit(elf_detach) != 0)
190 err(1, "atexit");
191 errno = 0;
192 ptrace(PT_ATTACH, pid, NULL, 0);
193 if (errno)
194 err(1, "PT_ATTACH");
195 if (waitpid(pid, &g_status, 0) == -1)
196 err(1, "waitpid");
197
198 /* Get the program's memory map. */
199 map = readmap(pid);
200
201 /* Size the program segments. */
202 seginfo.count = 0;
203 seginfo.size = 0;
204 each_dumpable_segment(map, cb_size_segment, &seginfo);
205
206 /*
207 * Build the header and the notes using sbuf and write to the file.
208 */
209 sb = sbuf_new_auto();
210 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
211 if (seginfo.count + 1 >= PN_XNUM)
212 hdrsize += sizeof(Elf_Shdr);
213 /* Start header + notes section. */
214 sbuf_start_section(sb, NULL);
215 /* Make empty header subsection. */
216 sbuf_start_section(sb, &old_len);
217 sbuf_putc(sb, 0);
218 sbuf_end_section(sb, old_len, hdrsize, 0);
219 /* Put notes. */
220 elf_putnotes(pid, sb, ¬esz);
221 /* Align up to a page boundary for the program segments. */
222 sbuf_end_section(sb, -1, getpagesize(), 0);
223 if (sbuf_finish(sb) != 0)
224 err(1, "sbuf_finish");
225 hdr = sbuf_data(sb);
226 segoff = sbuf_len(sb);
227 /* Fill in the header. */
228 elf_puthdr(efd, pid, map, hdr, hdrsize, notesz, segoff, seginfo.count);
229
230 n = write(fd, hdr, segoff);
231 if (n == -1)
232 err(1, "write");
233 if (n < segoff)
234 errx(1, "short write");
235
236 /* Write the contents of all of the writable segments. */
237 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
238 for (i = 0; i < seginfo.count; i++) {
239 struct ptrace_io_desc iorequest;
240 uintmax_t nleft = php->p_filesz;
241
242 iorequest.piod_op = PIOD_READ_D;
243 iorequest.piod_offs = (caddr_t)(uintptr_t)php->p_vaddr;
244 while (nleft > 0) {
245 char buf[8*1024];
246 size_t nwant;
247 ssize_t ngot;
248
249 if (nleft > sizeof(buf))
250 nwant = sizeof buf;
251 else
252 nwant = nleft;
253 iorequest.piod_addr = buf;
254 iorequest.piod_len = nwant;
255 ptrace(PT_IO, pid, (caddr_t)&iorequest, 0);
256 ngot = iorequest.piod_len;
257 if ((size_t)ngot < nwant)
258 errx(1, "short read wanted %zu, got %zd",
259 nwant, ngot);
260 ngot = write(fd, buf, nwant);
261 if (ngot == -1)
262 err(1, "write of segment %d failed", i);
263 if ((size_t)ngot != nwant)
264 errx(1, "short write");
265 nleft -= nwant;
266 iorequest.piod_offs += ngot;
267 }
268 php++;
269 }
270 sbuf_delete(sb);
271 freemap(map);
272 }
273
274 /*
275 * A callback for each_dumpable_segment() to write out the segment's
276 * program header entry.
277 */
278 static void
cb_put_phdr(struct map_entry * entry,void * closure)279 cb_put_phdr(struct map_entry *entry, void *closure)
280 {
281 struct phdr_closure *phc = (struct phdr_closure *)closure;
282 Elf_Phdr *phdr = phc->phdr;
283 size_t page_size;
284
285 page_size = getpagesize();
286 phc->offset = roundup2(phc->offset, page_size);
287
288 phdr->p_type = PT_LOAD;
289 phdr->p_offset = phc->offset;
290 phdr->p_vaddr = entry->start;
291 phdr->p_paddr = 0;
292 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
293 phdr->p_align = page_size;
294 phdr->p_flags = 0;
295 if (entry->protection & VM_PROT_READ)
296 phdr->p_flags |= PF_R;
297 if (entry->protection & VM_PROT_WRITE)
298 phdr->p_flags |= PF_W;
299 if (entry->protection & VM_PROT_EXECUTE)
300 phdr->p_flags |= PF_X;
301
302 phc->offset += phdr->p_filesz;
303 phc->phdr++;
304 }
305
306 /*
307 * A callback for each_dumpable_segment() to gather information about
308 * the number of segments and their total size.
309 */
310 static void
cb_size_segment(struct map_entry * entry,void * closure)311 cb_size_segment(struct map_entry *entry, void *closure)
312 {
313 struct sseg_closure *ssc = (struct sseg_closure *)closure;
314
315 ssc->count++;
316 ssc->size += entry->end - entry->start;
317 }
318
319 /*
320 * For each segment in the given memory map, call the given function
321 * with a pointer to the map entry and some arbitrary caller-supplied
322 * data.
323 */
324 static void
each_dumpable_segment(struct map_entry * map,segment_callback func,void * closure)325 each_dumpable_segment(struct map_entry *map, segment_callback func,
326 void *closure)
327 {
328 struct map_entry *entry;
329
330 for (entry = map; entry != NULL; entry = entry->next)
331 (*func)(entry, closure);
332 }
333
334 static void
elf_putnotes(pid_t pid,struct sbuf * sb,size_t * sizep)335 elf_putnotes(pid_t pid, struct sbuf *sb, size_t *sizep)
336 {
337 lwpid_t *tids;
338 size_t threads, old_len;
339 ssize_t size;
340 int i;
341
342 errno = 0;
343 threads = ptrace(PT_GETNUMLWPS, pid, NULL, 0);
344 if (errno)
345 err(1, "PT_GETNUMLWPS");
346 tids = malloc(threads * sizeof(*tids));
347 if (tids == NULL)
348 errx(1, "out of memory");
349 errno = 0;
350 ptrace(PT_GETLWPLIST, pid, (void *)tids, threads);
351 if (errno)
352 err(1, "PT_GETLWPLIST");
353
354 sbuf_start_section(sb, &old_len);
355 elf_putnote(NT_PRPSINFO, elf_note_prpsinfo, &pid, sb);
356
357 for (i = 0; i < threads; ++i) {
358 elf_putregnote(NT_PRSTATUS, tids[i], sb);
359 elf_putregnote(NT_FPREGSET, tids[i], sb);
360 elf_putregnote(NT_THRMISC, tids[i], sb);
361 elf_putregnote(NT_PTLWPINFO, tids[i], sb);
362 #if defined(__aarch64__) || defined(__arm__)
363 elf_putregnote(NT_ARM_TLS, tids[i], sb);
364 #endif
365 #if (defined(ELFCORE_COMPAT_32) && defined(__aarch64__)) || defined(__arm__)
366 elf_putregnote(NT_ARM_VFP, tids[i], sb);
367 #endif
368 #if defined(__i386__) || defined(__amd64__)
369 elf_putregnote(NT_X86_SEGBASES, tids[i], sb);
370 elf_putnote(NT_X86_XSTATE, elf_note_x86_xstate, tids + i, sb);
371 #endif
372 #if defined(__powerpc__)
373 elf_putnote(NT_PPC_VMX, elf_note_powerpc_vmx, tids + i, sb);
374 #ifndef __SPE__
375 elf_putnote(NT_PPC_VSX, elf_note_powerpc_vsx, tids + i, sb);
376 #endif
377 #endif
378 }
379
380 #ifndef ELFCORE_COMPAT_32
381 elf_putnote(NT_PROCSTAT_PROC, elf_note_procstat_proc, &pid, sb);
382 elf_putnote(NT_PROCSTAT_FILES, elf_note_procstat_files, &pid, sb);
383 elf_putnote(NT_PROCSTAT_VMMAP, elf_note_procstat_vmmap, &pid, sb);
384 elf_putnote(NT_PROCSTAT_GROUPS, elf_note_procstat_groups, &pid, sb);
385 elf_putnote(NT_PROCSTAT_UMASK, elf_note_procstat_umask, &pid, sb);
386 elf_putnote(NT_PROCSTAT_RLIMIT, elf_note_procstat_rlimit, &pid, sb);
387 elf_putnote(NT_PROCSTAT_OSREL, elf_note_procstat_osrel, &pid, sb);
388 elf_putnote(NT_PROCSTAT_PSSTRINGS, elf_note_procstat_psstrings, &pid,
389 sb);
390 elf_putnote(NT_PROCSTAT_AUXV, elf_note_procstat_auxv, &pid, sb);
391 #endif
392
393 size = sbuf_end_section(sb, old_len, 1, 0);
394 if (size == -1)
395 err(1, "sbuf_end_section");
396 free(tids);
397 *sizep = size;
398 }
399
400 /*
401 * Emit one register set note section to sbuf.
402 */
403 static void
elf_putregnote(int type,lwpid_t tid,struct sbuf * sb)404 elf_putregnote(int type, lwpid_t tid, struct sbuf *sb)
405 {
406 Elf_Note note;
407 struct iovec iov;
408 ssize_t old_len;
409
410 iov.iov_base = NULL;
411 iov.iov_len = 0;
412 if (ptrace(PT_GETREGSET, tid, (void *)&iov, type) != 0)
413 return;
414 iov.iov_base = calloc(1, iov.iov_len);
415 if (iov.iov_base == NULL)
416 errx(1, "out of memory");
417 if (ptrace(PT_GETREGSET, tid, (void *)&iov, type) != 0)
418 errx(1, "failed to fetch register set %d", type);
419
420 note.n_namesz = 8; /* strlen("FreeBSD") + 1 */
421 note.n_descsz = iov.iov_len;
422 note.n_type = type;
423
424 sbuf_bcat(sb, ¬e, sizeof(note));
425 sbuf_start_section(sb, &old_len);
426 sbuf_bcat(sb, "FreeBSD", note.n_namesz);
427 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
428 sbuf_start_section(sb, &old_len);
429 sbuf_bcat(sb, iov.iov_base, iov.iov_len);
430 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
431 free(iov.iov_base);
432 }
433
434 /*
435 * Emit one note section to sbuf.
436 */
437 static void
elf_putnote(int type,notefunc_t notefunc,void * arg,struct sbuf * sb)438 elf_putnote(int type, notefunc_t notefunc, void *arg, struct sbuf *sb)
439 {
440 Elf_Note note;
441 size_t descsz;
442 ssize_t old_len;
443 void *desc;
444
445 desc = notefunc(arg, &descsz);
446 note.n_namesz = 8; /* strlen("FreeBSD") + 1 */
447 note.n_descsz = descsz;
448 note.n_type = type;
449
450 sbuf_bcat(sb, ¬e, sizeof(note));
451 sbuf_start_section(sb, &old_len);
452 sbuf_bcat(sb, "FreeBSD", note.n_namesz);
453 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
454 if (descsz == 0)
455 return;
456 sbuf_start_section(sb, &old_len);
457 sbuf_bcat(sb, desc, descsz);
458 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
459 free(desc);
460 }
461
462 /*
463 * Generate the ELF coredump header.
464 */
465 static void
elf_puthdr(int efd,pid_t pid,struct map_entry * map,void * hdr,size_t hdrsize,size_t notesz,size_t segoff,int numsegs)466 elf_puthdr(int efd, pid_t pid, struct map_entry *map, void *hdr, size_t hdrsize,
467 size_t notesz, size_t segoff, int numsegs)
468 {
469 Elf_Ehdr *ehdr, binhdr;
470 Elf_Phdr *phdr;
471 Elf_Shdr *shdr;
472 struct phdr_closure phc;
473 ssize_t cnt;
474
475 cnt = read(efd, &binhdr, sizeof(binhdr));
476 if (cnt < 0)
477 err(1, "Failed to re-read ELF header");
478 else if (cnt != sizeof(binhdr))
479 errx(1, "Failed to re-read ELF header");
480
481 ehdr = (Elf_Ehdr *)hdr;
482
483 ehdr->e_ident[EI_MAG0] = ELFMAG0;
484 ehdr->e_ident[EI_MAG1] = ELFMAG1;
485 ehdr->e_ident[EI_MAG2] = ELFMAG2;
486 ehdr->e_ident[EI_MAG3] = ELFMAG3;
487 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
488 ehdr->e_ident[EI_DATA] = ELF_DATA;
489 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
490 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
491 ehdr->e_ident[EI_ABIVERSION] = 0;
492 ehdr->e_ident[EI_PAD] = 0;
493 ehdr->e_type = ET_CORE;
494 ehdr->e_machine = binhdr.e_machine;
495 ehdr->e_version = EV_CURRENT;
496 ehdr->e_entry = 0;
497 ehdr->e_phoff = sizeof(Elf_Ehdr);
498 ehdr->e_flags = binhdr.e_flags;
499 ehdr->e_ehsize = sizeof(Elf_Ehdr);
500 ehdr->e_phentsize = sizeof(Elf_Phdr);
501 ehdr->e_shentsize = sizeof(Elf_Shdr);
502 ehdr->e_shstrndx = SHN_UNDEF;
503 if (numsegs + 1 < PN_XNUM) {
504 ehdr->e_phnum = numsegs + 1;
505 ehdr->e_shnum = 0;
506 } else {
507 ehdr->e_phnum = PN_XNUM;
508 ehdr->e_shnum = 1;
509
510 ehdr->e_shoff = ehdr->e_phoff +
511 (numsegs + 1) * ehdr->e_phentsize;
512
513 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
514 memset(shdr, 0, sizeof(*shdr));
515 /*
516 * A special first section is used to hold large segment and
517 * section counts. This was proposed by Sun Microsystems in
518 * Solaris and has been adopted by Linux; the standard ELF
519 * tools are already familiar with the technique.
520 *
521 * See table 7-7 of the Solaris "Linker and Libraries Guide"
522 * (or 12-7 depending on the version of the document) for more
523 * details.
524 */
525 shdr->sh_type = SHT_NULL;
526 shdr->sh_size = ehdr->e_shnum;
527 shdr->sh_link = ehdr->e_shstrndx;
528 shdr->sh_info = numsegs + 1;
529 }
530
531 /*
532 * Fill in the program header entries.
533 */
534 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
535
536 /* The note segment. */
537 phdr->p_type = PT_NOTE;
538 phdr->p_offset = hdrsize;
539 phdr->p_vaddr = 0;
540 phdr->p_paddr = 0;
541 phdr->p_filesz = notesz;
542 phdr->p_memsz = 0;
543 phdr->p_flags = PF_R;
544 phdr->p_align = sizeof(Elf32_Size);
545 phdr++;
546
547 /* All the writable segments from the program. */
548 phc.phdr = phdr;
549 phc.offset = segoff;
550 each_dumpable_segment(map, cb_put_phdr, &phc);
551 }
552
553 /*
554 * Free the memory map.
555 */
556 static void
freemap(struct map_entry * map)557 freemap(struct map_entry *map)
558 {
559 struct map_entry *next;
560
561 while (map != NULL) {
562 next = map->next;
563 free(map);
564 map = next;
565 }
566 }
567
568 /*
569 * Read the process's memory map using kinfo_getvmmap(), and return a list of
570 * VM map entries. Only the non-device read/writable segments are
571 * returned. The map entries in the list aren't fully filled in; only
572 * the items we need are present.
573 */
574 static struct map_entry *
readmap(pid_t pid)575 readmap(pid_t pid)
576 {
577 struct map_entry *ent, **linkp, *map;
578 struct kinfo_vmentry *vmentl, *kve;
579 int i, nitems;
580
581 vmentl = kinfo_getvmmap(pid, &nitems);
582 if (vmentl == NULL)
583 err(1, "cannot retrieve mappings for %u process", pid);
584
585 map = NULL;
586 linkp = ↦
587 for (i = 0; i < nitems; i++) {
588 kve = &vmentl[i];
589
590 /*
591 * Ignore 'malformed' segments or ones representing memory
592 * mapping with MAP_NOCORE on.
593 * If the 'full' support is disabled, just dump the most
594 * meaningful data segments.
595 */
596 if ((kve->kve_protection & KVME_PROT_READ) == 0 ||
597 (kve->kve_flags & KVME_FLAG_NOCOREDUMP) != 0 ||
598 kve->kve_type == KVME_TYPE_DEAD ||
599 kve->kve_type == KVME_TYPE_UNKNOWN ||
600 ((pflags & PFLAGS_FULL) == 0 &&
601 kve->kve_type != KVME_TYPE_DEFAULT &&
602 kve->kve_type != KVME_TYPE_VNODE &&
603 kve->kve_type != KVME_TYPE_SWAP &&
604 kve->kve_type != KVME_TYPE_PHYS))
605 continue;
606
607 ent = calloc(1, sizeof(*ent));
608 if (ent == NULL)
609 errx(1, "out of memory");
610 ent->start = (vm_offset_t)kve->kve_start;
611 ent->end = (vm_offset_t)kve->kve_end;
612 ent->protection = VM_PROT_READ;
613 if ((kve->kve_protection & KVME_PROT_WRITE) != 0)
614 ent->protection |= VM_PROT_WRITE;
615 if ((kve->kve_protection & KVME_PROT_EXEC) != 0)
616 ent->protection |= VM_PROT_EXECUTE;
617
618 *linkp = ent;
619 linkp = &ent->next;
620 }
621 free(vmentl);
622 return (map);
623 }
624
625 /*
626 * Miscellaneous note out functions.
627 */
628
629 static void *
elf_note_prpsinfo(void * arg,size_t * sizep)630 elf_note_prpsinfo(void *arg, size_t *sizep)
631 {
632 char *cp, *end;
633 pid_t pid;
634 elfcore_prpsinfo_t *psinfo;
635 struct kinfo_proc kip;
636 size_t len;
637 int name[4];
638
639 pid = *(pid_t *)arg;
640 psinfo = calloc(1, sizeof(*psinfo));
641 if (psinfo == NULL)
642 errx(1, "out of memory");
643 psinfo->pr_version = PRPSINFO_VERSION;
644 psinfo->pr_psinfosz = sizeof(*psinfo);
645
646 name[0] = CTL_KERN;
647 name[1] = KERN_PROC;
648 name[2] = KERN_PROC_PID;
649 name[3] = pid;
650 len = sizeof(kip);
651 if (sysctl(name, 4, &kip, &len, NULL, 0) == -1)
652 err(1, "kern.proc.pid.%u", pid);
653 if (kip.ki_pid != pid)
654 err(1, "kern.proc.pid.%u", pid);
655 strlcpy(psinfo->pr_fname, kip.ki_comm, sizeof(psinfo->pr_fname));
656 name[2] = KERN_PROC_ARGS;
657 len = sizeof(psinfo->pr_psargs) - 1;
658 if (sysctl(name, 4, psinfo->pr_psargs, &len, NULL, 0) == 0 && len > 0) {
659 cp = psinfo->pr_psargs;
660 end = cp + len - 1;
661 for (;;) {
662 cp = memchr(cp, '\0', end - cp);
663 if (cp == NULL)
664 break;
665 *cp = ' ';
666 }
667 } else
668 strlcpy(psinfo->pr_psargs, kip.ki_comm,
669 sizeof(psinfo->pr_psargs));
670 psinfo->pr_pid = pid;
671
672 *sizep = sizeof(*psinfo);
673 return (psinfo);
674 }
675
676 #if defined(__i386__) || defined(__amd64__)
677 static void *
elf_note_x86_xstate(void * arg,size_t * sizep)678 elf_note_x86_xstate(void *arg, size_t *sizep)
679 {
680 lwpid_t tid;
681 char *xstate;
682 static bool xsave_checked = false;
683 static struct ptrace_xstate_info info;
684
685 tid = *(lwpid_t *)arg;
686 if (!xsave_checked) {
687 if (ptrace(PT_GETXSTATE_INFO, tid, (void *)&info,
688 sizeof(info)) != 0)
689 info.xsave_len = 0;
690 xsave_checked = true;
691 }
692 if (info.xsave_len == 0) {
693 *sizep = 0;
694 return (NULL);
695 }
696 xstate = calloc(1, info.xsave_len);
697 ptrace(PT_GETXSTATE, tid, xstate, 0);
698 *(uint64_t *)(xstate + X86_XSTATE_XCR0_OFFSET) = info.xsave_mask;
699 *sizep = info.xsave_len;
700 return (xstate);
701 }
702 #endif
703
704 #if defined(__powerpc__)
705 static void *
elf_note_powerpc_vmx(void * arg,size_t * sizep)706 elf_note_powerpc_vmx(void *arg, size_t *sizep)
707 {
708 lwpid_t tid;
709 struct vmxreg *vmx;
710 static bool has_vmx = true;
711 struct vmxreg info;
712
713 tid = *(lwpid_t *)arg;
714 if (has_vmx) {
715 if (ptrace(PT_GETVRREGS, tid, (void *)&info,
716 sizeof(info)) != 0)
717 has_vmx = false;
718 }
719 if (!has_vmx) {
720 *sizep = 0;
721 return (NULL);
722 }
723 vmx = calloc(1, sizeof(*vmx));
724 memcpy(vmx, &info, sizeof(*vmx));
725 *sizep = sizeof(*vmx);
726 return (vmx);
727 }
728
729 static void *
elf_note_powerpc_vsx(void * arg,size_t * sizep)730 elf_note_powerpc_vsx(void *arg, size_t *sizep)
731 {
732 lwpid_t tid;
733 char *vshr_data;
734 static bool has_vsx = true;
735 uint64_t vshr[32];
736
737 tid = *(lwpid_t *)arg;
738 if (has_vsx) {
739 if (ptrace(PT_GETVSRREGS, tid, (void *)vshr,
740 sizeof(vshr)) != 0)
741 has_vsx = false;
742 }
743 if (!has_vsx) {
744 *sizep = 0;
745 return (NULL);
746 }
747 vshr_data = calloc(1, sizeof(vshr));
748 memcpy(vshr_data, vshr, sizeof(vshr));
749 *sizep = sizeof(vshr);
750 return (vshr_data);
751 }
752 #endif
753
754 static void *
procstat_sysctl(void * arg,int what,size_t structsz,size_t * sizep)755 procstat_sysctl(void *arg, int what, size_t structsz, size_t *sizep)
756 {
757 size_t len;
758 pid_t pid;
759 int name[4], structsize;
760 void *buf, *p;
761
762 pid = *(pid_t *)arg;
763 structsize = structsz;
764 name[0] = CTL_KERN;
765 name[1] = KERN_PROC;
766 name[2] = what;
767 name[3] = pid;
768 len = 0;
769 if (sysctl(name, 4, NULL, &len, NULL, 0) == -1)
770 err(1, "kern.proc.%d.%u", what, pid);
771 buf = calloc(1, sizeof(structsize) + len * 4 / 3);
772 if (buf == NULL)
773 errx(1, "out of memory");
774 bcopy(&structsize, buf, sizeof(structsize));
775 p = (char *)buf + sizeof(structsize);
776 if (sysctl(name, 4, p, &len, NULL, 0) == -1)
777 err(1, "kern.proc.%d.%u", what, pid);
778
779 *sizep = sizeof(structsize) + len;
780 return (buf);
781 }
782
783 static void *
elf_note_procstat_proc(void * arg,size_t * sizep)784 elf_note_procstat_proc(void *arg, size_t *sizep)
785 {
786
787 return (procstat_sysctl(arg, KERN_PROC_PID | KERN_PROC_INC_THREAD,
788 sizeof(struct kinfo_proc), sizep));
789 }
790
791 static void *
elf_note_procstat_files(void * arg,size_t * sizep)792 elf_note_procstat_files(void *arg, size_t *sizep)
793 {
794
795 return (procstat_sysctl(arg, KERN_PROC_FILEDESC,
796 sizeof(struct kinfo_file), sizep));
797 }
798
799 static void *
elf_note_procstat_vmmap(void * arg,size_t * sizep)800 elf_note_procstat_vmmap(void *arg, size_t *sizep)
801 {
802
803 return (procstat_sysctl(arg, KERN_PROC_VMMAP,
804 sizeof(struct kinfo_vmentry), sizep));
805 }
806
807 static void *
elf_note_procstat_groups(void * arg,size_t * sizep)808 elf_note_procstat_groups(void *arg, size_t *sizep)
809 {
810
811 return (procstat_sysctl(arg, KERN_PROC_GROUPS, sizeof(gid_t), sizep));
812 }
813
814 static void *
elf_note_procstat_umask(void * arg,size_t * sizep)815 elf_note_procstat_umask(void *arg, size_t *sizep)
816 {
817
818 return (procstat_sysctl(arg, KERN_PROC_UMASK, sizeof(u_short), sizep));
819 }
820
821 static void *
elf_note_procstat_osrel(void * arg,size_t * sizep)822 elf_note_procstat_osrel(void *arg, size_t *sizep)
823 {
824
825 return (procstat_sysctl(arg, KERN_PROC_OSREL, sizeof(int), sizep));
826 }
827
828 static void *
elf_note_procstat_psstrings(void * arg,size_t * sizep)829 elf_note_procstat_psstrings(void *arg, size_t *sizep)
830 {
831
832 return (procstat_sysctl(arg, KERN_PROC_PS_STRINGS,
833 sizeof(vm_offset_t), sizep));
834 }
835
836 static void *
elf_note_procstat_auxv(void * arg,size_t * sizep)837 elf_note_procstat_auxv(void *arg, size_t *sizep)
838 {
839
840 return (procstat_sysctl(arg, KERN_PROC_AUXV,
841 sizeof(Elf_Auxinfo), sizep));
842 }
843
844 static void *
elf_note_procstat_rlimit(void * arg,size_t * sizep)845 elf_note_procstat_rlimit(void *arg, size_t *sizep)
846 {
847 pid_t pid;
848 size_t len;
849 int i, name[5], structsize;
850 void *buf, *p;
851
852 pid = *(pid_t *)arg;
853 structsize = sizeof(struct rlimit) * RLIM_NLIMITS;
854 buf = calloc(1, sizeof(structsize) + structsize);
855 if (buf == NULL)
856 errx(1, "out of memory");
857 bcopy(&structsize, buf, sizeof(structsize));
858 p = (char *)buf + sizeof(structsize);
859 name[0] = CTL_KERN;
860 name[1] = KERN_PROC;
861 name[2] = KERN_PROC_RLIMIT;
862 name[3] = pid;
863 len = sizeof(struct rlimit);
864 for (i = 0; i < RLIM_NLIMITS; i++) {
865 name[4] = i;
866 if (sysctl(name, 5, p, &len, NULL, 0) == -1)
867 err(1, "kern.proc.rlimit.%u", pid);
868 if (len != sizeof(struct rlimit))
869 errx(1, "kern.proc.rlimit.%u: short read", pid);
870 p += len;
871 }
872
873 *sizep = sizeof(structsize) + structsize;
874 return (buf);
875 }
876
877 struct dumpers __elfN(dump) = { elf_ident, elf_coredump };
878 TEXT_SET(dumpset, __elfN(dump));
879