1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
33
34 #include <sys/endian.h>
35 #include <sys/param.h>
36 #include <sys/procfs.h>
37 #include <sys/ptrace.h>
38 #include <sys/queue.h>
39 #include <sys/linker_set.h>
40 #include <sys/sbuf.h>
41 #include <sys/sysctl.h>
42 #include <sys/user.h>
43 #include <sys/wait.h>
44 #include <machine/elf.h>
45 #include <vm/vm_param.h>
46 #include <vm/vm.h>
47 #include <assert.h>
48 #include <err.h>
49 #include <errno.h>
50 #include <fcntl.h>
51 #include <stdbool.h>
52 #include <stdint.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <unistd.h>
57 #include <libutil.h>
58
59 #include "extern.h"
60
61 /*
62 * Code for generating ELF core dumps.
63 */
64
65 struct map_entry {
66 struct map_entry *next;
67 vm_offset_t start;
68 vm_offset_t end;
69 vm_prot_t protection;
70 };
71
72 typedef void (*segment_callback)(struct map_entry *, void *);
73
74 /* Closure for cb_put_phdr(). */
75 struct phdr_closure {
76 Elf_Phdr *phdr; /* Program header to fill in */
77 Elf_Off offset; /* Offset of segment in core file */
78 };
79
80 /* Closure for cb_size_segment(). */
81 struct sseg_closure {
82 int count; /* Count of writable segments. */
83 size_t size; /* Total size of all writable segments. */
84 };
85
86 #ifdef ELFCORE_COMPAT_32
87 typedef struct fpreg32 elfcore_fpregset_t;
88 typedef struct reg32 elfcore_gregset_t;
89 typedef struct prpsinfo32 elfcore_prpsinfo_t;
90 typedef struct prstatus32 elfcore_prstatus_t;
91 typedef struct ptrace_lwpinfo32 elfcore_lwpinfo_t;
92 static void elf_convert_gregset(elfcore_gregset_t *rd, struct reg *rs);
93 static void elf_convert_fpregset(elfcore_fpregset_t *rd, struct fpreg *rs);
94 static void elf_convert_lwpinfo(struct ptrace_lwpinfo32 *pld,
95 struct ptrace_lwpinfo *pls);
96 #else
97 typedef fpregset_t elfcore_fpregset_t;
98 typedef gregset_t elfcore_gregset_t;
99 typedef prpsinfo_t elfcore_prpsinfo_t;
100 typedef prstatus_t elfcore_prstatus_t;
101 typedef struct ptrace_lwpinfo elfcore_lwpinfo_t;
102 #define elf_convert_gregset(d,s) *d = *s
103 #define elf_convert_fpregset(d,s) *d = *s
104 #define elf_convert_lwpinfo(d,s) *d = *s
105 #endif
106
107 typedef void* (*notefunc_t)(void *, size_t *);
108
109 static void cb_put_phdr(struct map_entry *, void *);
110 static void cb_size_segment(struct map_entry *, void *);
111 static void each_dumpable_segment(struct map_entry *, segment_callback,
112 void *closure);
113 static void elf_detach(void); /* atexit() handler. */
114 static void *elf_note_fpregset(void *, size_t *);
115 static void *elf_note_prpsinfo(void *, size_t *);
116 static void *elf_note_prstatus(void *, size_t *);
117 static void *elf_note_thrmisc(void *, size_t *);
118 static void *elf_note_ptlwpinfo(void *, size_t *);
119 #if defined(__arm__)
120 static void *elf_note_arm_vfp(void *, size_t *);
121 #endif
122 #if defined(__i386__) || defined(__amd64__)
123 static void *elf_note_x86_xstate(void *, size_t *);
124 #endif
125 #if defined(__powerpc__)
126 static void *elf_note_powerpc_vmx(void *, size_t *);
127 static void *elf_note_powerpc_vsx(void *, size_t *);
128 #endif
129 static void *elf_note_procstat_auxv(void *, size_t *);
130 static void *elf_note_procstat_files(void *, size_t *);
131 static void *elf_note_procstat_groups(void *, size_t *);
132 static void *elf_note_procstat_osrel(void *, size_t *);
133 static void *elf_note_procstat_proc(void *, size_t *);
134 static void *elf_note_procstat_psstrings(void *, size_t *);
135 static void *elf_note_procstat_rlimit(void *, size_t *);
136 static void *elf_note_procstat_umask(void *, size_t *);
137 static void *elf_note_procstat_vmmap(void *, size_t *);
138 static void elf_puthdr(int, pid_t, struct map_entry *, void *, size_t, size_t,
139 size_t, int);
140 static void elf_putnote(int, notefunc_t, void *, struct sbuf *);
141 static void elf_putnotes(pid_t, struct sbuf *, size_t *);
142 static void freemap(struct map_entry *);
143 static struct map_entry *readmap(pid_t);
144 static void *procstat_sysctl(void *, int, size_t, size_t *sizep);
145
146 static pid_t g_pid; /* Pid being dumped, global for elf_detach */
147 static int g_status; /* proc status after ptrace attach */
148
149 static int
elf_ident(int efd,pid_t pid __unused,char * binfile __unused)150 elf_ident(int efd, pid_t pid __unused, char *binfile __unused)
151 {
152 Elf_Ehdr hdr;
153 int cnt;
154 uint16_t machine;
155
156 cnt = read(efd, &hdr, sizeof(hdr));
157 if (cnt != sizeof(hdr))
158 return (0);
159 if (!IS_ELF(hdr))
160 return (0);
161 switch (hdr.e_ident[EI_DATA]) {
162 case ELFDATA2LSB:
163 machine = le16toh(hdr.e_machine);
164 break;
165 case ELFDATA2MSB:
166 machine = be16toh(hdr.e_machine);
167 break;
168 default:
169 return (0);
170 }
171 if (!ELF_MACHINE_OK(machine))
172 return (0);
173
174 /* Looks good. */
175 return (1);
176 }
177
178 static void
elf_detach(void)179 elf_detach(void)
180 {
181 int sig;
182
183 if (g_pid != 0) {
184 /*
185 * Forward any pending signals. SIGSTOP is generated by ptrace
186 * itself, so ignore it.
187 */
188 sig = WIFSTOPPED(g_status) ? WSTOPSIG(g_status) : 0;
189 if (sig == SIGSTOP)
190 sig = 0;
191 ptrace(PT_DETACH, g_pid, (caddr_t)1, sig);
192 }
193 }
194
195 /*
196 * Write an ELF coredump for the given pid to the given fd.
197 */
198 static void
elf_coredump(int efd,int fd,pid_t pid)199 elf_coredump(int efd, int fd, pid_t pid)
200 {
201 struct map_entry *map;
202 struct sseg_closure seginfo;
203 struct sbuf *sb;
204 void *hdr;
205 size_t hdrsize, notesz, segoff;
206 ssize_t n, old_len;
207 Elf_Phdr *php;
208 int i;
209
210 /* Attach to process to dump. */
211 g_pid = pid;
212 if (atexit(elf_detach) != 0)
213 err(1, "atexit");
214 errno = 0;
215 ptrace(PT_ATTACH, pid, NULL, 0);
216 if (errno)
217 err(1, "PT_ATTACH");
218 if (waitpid(pid, &g_status, 0) == -1)
219 err(1, "waitpid");
220
221 /* Get the program's memory map. */
222 map = readmap(pid);
223
224 /* Size the program segments. */
225 seginfo.count = 0;
226 seginfo.size = 0;
227 each_dumpable_segment(map, cb_size_segment, &seginfo);
228
229 /*
230 * Build the header and the notes using sbuf and write to the file.
231 */
232 sb = sbuf_new_auto();
233 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
234 if (seginfo.count + 1 >= PN_XNUM)
235 hdrsize += sizeof(Elf_Shdr);
236 /* Start header + notes section. */
237 sbuf_start_section(sb, NULL);
238 /* Make empty header subsection. */
239 sbuf_start_section(sb, &old_len);
240 sbuf_putc(sb, 0);
241 sbuf_end_section(sb, old_len, hdrsize, 0);
242 /* Put notes. */
243 elf_putnotes(pid, sb, ¬esz);
244 /* Align up to a page boundary for the program segments. */
245 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
246 if (sbuf_finish(sb) != 0)
247 err(1, "sbuf_finish");
248 hdr = sbuf_data(sb);
249 segoff = sbuf_len(sb);
250 /* Fill in the header. */
251 elf_puthdr(efd, pid, map, hdr, hdrsize, notesz, segoff, seginfo.count);
252
253 n = write(fd, hdr, segoff);
254 if (n == -1)
255 err(1, "write");
256 if (n < segoff)
257 errx(1, "short write");
258
259 /* Write the contents of all of the writable segments. */
260 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
261 for (i = 0; i < seginfo.count; i++) {
262 struct ptrace_io_desc iorequest;
263 uintmax_t nleft = php->p_filesz;
264
265 iorequest.piod_op = PIOD_READ_D;
266 iorequest.piod_offs = (caddr_t)(uintptr_t)php->p_vaddr;
267 while (nleft > 0) {
268 char buf[8*1024];
269 size_t nwant;
270 ssize_t ngot;
271
272 if (nleft > sizeof(buf))
273 nwant = sizeof buf;
274 else
275 nwant = nleft;
276 iorequest.piod_addr = buf;
277 iorequest.piod_len = nwant;
278 ptrace(PT_IO, pid, (caddr_t)&iorequest, 0);
279 ngot = iorequest.piod_len;
280 if ((size_t)ngot < nwant)
281 errx(1, "short read wanted %zu, got %zd",
282 nwant, ngot);
283 ngot = write(fd, buf, nwant);
284 if (ngot == -1)
285 err(1, "write of segment %d failed", i);
286 if ((size_t)ngot != nwant)
287 errx(1, "short write");
288 nleft -= nwant;
289 iorequest.piod_offs += ngot;
290 }
291 php++;
292 }
293 sbuf_delete(sb);
294 freemap(map);
295 }
296
297 /*
298 * A callback for each_dumpable_segment() to write out the segment's
299 * program header entry.
300 */
301 static void
cb_put_phdr(struct map_entry * entry,void * closure)302 cb_put_phdr(struct map_entry *entry, void *closure)
303 {
304 struct phdr_closure *phc = (struct phdr_closure *)closure;
305 Elf_Phdr *phdr = phc->phdr;
306
307 phc->offset = round_page(phc->offset);
308
309 phdr->p_type = PT_LOAD;
310 phdr->p_offset = phc->offset;
311 phdr->p_vaddr = entry->start;
312 phdr->p_paddr = 0;
313 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
314 phdr->p_align = PAGE_SIZE;
315 phdr->p_flags = 0;
316 if (entry->protection & VM_PROT_READ)
317 phdr->p_flags |= PF_R;
318 if (entry->protection & VM_PROT_WRITE)
319 phdr->p_flags |= PF_W;
320 if (entry->protection & VM_PROT_EXECUTE)
321 phdr->p_flags |= PF_X;
322
323 phc->offset += phdr->p_filesz;
324 phc->phdr++;
325 }
326
327 /*
328 * A callback for each_dumpable_segment() to gather information about
329 * the number of segments and their total size.
330 */
331 static void
cb_size_segment(struct map_entry * entry,void * closure)332 cb_size_segment(struct map_entry *entry, void *closure)
333 {
334 struct sseg_closure *ssc = (struct sseg_closure *)closure;
335
336 ssc->count++;
337 ssc->size += entry->end - entry->start;
338 }
339
340 /*
341 * For each segment in the given memory map, call the given function
342 * with a pointer to the map entry and some arbitrary caller-supplied
343 * data.
344 */
345 static void
each_dumpable_segment(struct map_entry * map,segment_callback func,void * closure)346 each_dumpable_segment(struct map_entry *map, segment_callback func,
347 void *closure)
348 {
349 struct map_entry *entry;
350
351 for (entry = map; entry != NULL; entry = entry->next)
352 (*func)(entry, closure);
353 }
354
355 static void
elf_putnotes(pid_t pid,struct sbuf * sb,size_t * sizep)356 elf_putnotes(pid_t pid, struct sbuf *sb, size_t *sizep)
357 {
358 lwpid_t *tids;
359 size_t threads, old_len;
360 ssize_t size;
361 int i;
362
363 errno = 0;
364 threads = ptrace(PT_GETNUMLWPS, pid, NULL, 0);
365 if (errno)
366 err(1, "PT_GETNUMLWPS");
367 tids = malloc(threads * sizeof(*tids));
368 if (tids == NULL)
369 errx(1, "out of memory");
370 errno = 0;
371 ptrace(PT_GETLWPLIST, pid, (void *)tids, threads);
372 if (errno)
373 err(1, "PT_GETLWPLIST");
374
375 sbuf_start_section(sb, &old_len);
376 elf_putnote(NT_PRPSINFO, elf_note_prpsinfo, &pid, sb);
377
378 for (i = 0; i < threads; ++i) {
379 elf_putnote(NT_PRSTATUS, elf_note_prstatus, tids + i, sb);
380 elf_putnote(NT_FPREGSET, elf_note_fpregset, tids + i, sb);
381 elf_putnote(NT_THRMISC, elf_note_thrmisc, tids + i, sb);
382 elf_putnote(NT_PTLWPINFO, elf_note_ptlwpinfo, tids + i, sb);
383 #if defined(__arm__)
384 elf_putnote(NT_ARM_VFP, elf_note_arm_vfp, tids + i, sb);
385 #endif
386 #if defined(__i386__) || defined(__amd64__)
387 elf_putnote(NT_X86_XSTATE, elf_note_x86_xstate, tids + i, sb);
388 #endif
389 #if defined(__powerpc__)
390 elf_putnote(NT_PPC_VMX, elf_note_powerpc_vmx, tids + i, sb);
391 #ifndef __SPE__
392 elf_putnote(NT_PPC_VSX, elf_note_powerpc_vsx, tids + i, sb);
393 #endif
394 #endif
395 }
396
397 #ifndef ELFCORE_COMPAT_32
398 elf_putnote(NT_PROCSTAT_PROC, elf_note_procstat_proc, &pid, sb);
399 elf_putnote(NT_PROCSTAT_FILES, elf_note_procstat_files, &pid, sb);
400 elf_putnote(NT_PROCSTAT_VMMAP, elf_note_procstat_vmmap, &pid, sb);
401 elf_putnote(NT_PROCSTAT_GROUPS, elf_note_procstat_groups, &pid, sb);
402 elf_putnote(NT_PROCSTAT_UMASK, elf_note_procstat_umask, &pid, sb);
403 elf_putnote(NT_PROCSTAT_RLIMIT, elf_note_procstat_rlimit, &pid, sb);
404 elf_putnote(NT_PROCSTAT_OSREL, elf_note_procstat_osrel, &pid, sb);
405 elf_putnote(NT_PROCSTAT_PSSTRINGS, elf_note_procstat_psstrings, &pid,
406 sb);
407 elf_putnote(NT_PROCSTAT_AUXV, elf_note_procstat_auxv, &pid, sb);
408 #endif
409
410 size = sbuf_end_section(sb, old_len, 1, 0);
411 if (size == -1)
412 err(1, "sbuf_end_section");
413 free(tids);
414 *sizep = size;
415 }
416
417 /*
418 * Emit one note section to sbuf.
419 */
420 static void
elf_putnote(int type,notefunc_t notefunc,void * arg,struct sbuf * sb)421 elf_putnote(int type, notefunc_t notefunc, void *arg, struct sbuf *sb)
422 {
423 Elf_Note note;
424 size_t descsz;
425 ssize_t old_len;
426 void *desc;
427
428 desc = notefunc(arg, &descsz);
429 note.n_namesz = 8; /* strlen("FreeBSD") + 1 */
430 note.n_descsz = descsz;
431 note.n_type = type;
432
433 sbuf_bcat(sb, ¬e, sizeof(note));
434 sbuf_start_section(sb, &old_len);
435 sbuf_bcat(sb, "FreeBSD", note.n_namesz);
436 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
437 if (descsz == 0)
438 return;
439 sbuf_start_section(sb, &old_len);
440 sbuf_bcat(sb, desc, descsz);
441 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
442 free(desc);
443 }
444
445 /*
446 * Generate the ELF coredump header.
447 */
448 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)449 elf_puthdr(int efd, pid_t pid, struct map_entry *map, void *hdr, size_t hdrsize,
450 size_t notesz, size_t segoff, int numsegs)
451 {
452 Elf_Ehdr *ehdr, binhdr;
453 Elf_Phdr *phdr;
454 Elf_Shdr *shdr;
455 struct phdr_closure phc;
456 ssize_t cnt;
457
458 cnt = read(efd, &binhdr, sizeof(binhdr));
459 if (cnt < 0)
460 err(1, "Failed to re-read ELF header");
461 else if (cnt != sizeof(binhdr))
462 errx(1, "Failed to re-read ELF header");
463
464 ehdr = (Elf_Ehdr *)hdr;
465
466 ehdr->e_ident[EI_MAG0] = ELFMAG0;
467 ehdr->e_ident[EI_MAG1] = ELFMAG1;
468 ehdr->e_ident[EI_MAG2] = ELFMAG2;
469 ehdr->e_ident[EI_MAG3] = ELFMAG3;
470 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
471 ehdr->e_ident[EI_DATA] = ELF_DATA;
472 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
473 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
474 ehdr->e_ident[EI_ABIVERSION] = 0;
475 ehdr->e_ident[EI_PAD] = 0;
476 ehdr->e_type = ET_CORE;
477 ehdr->e_machine = binhdr.e_machine;
478 ehdr->e_version = EV_CURRENT;
479 ehdr->e_entry = 0;
480 ehdr->e_phoff = sizeof(Elf_Ehdr);
481 ehdr->e_flags = binhdr.e_flags;
482 ehdr->e_ehsize = sizeof(Elf_Ehdr);
483 ehdr->e_phentsize = sizeof(Elf_Phdr);
484 ehdr->e_shentsize = sizeof(Elf_Shdr);
485 ehdr->e_shstrndx = SHN_UNDEF;
486 if (numsegs + 1 < PN_XNUM) {
487 ehdr->e_phnum = numsegs + 1;
488 ehdr->e_shnum = 0;
489 } else {
490 ehdr->e_phnum = PN_XNUM;
491 ehdr->e_shnum = 1;
492
493 ehdr->e_shoff = ehdr->e_phoff +
494 (numsegs + 1) * ehdr->e_phentsize;
495
496 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
497 memset(shdr, 0, sizeof(*shdr));
498 /*
499 * A special first section is used to hold large segment and
500 * section counts. This was proposed by Sun Microsystems in
501 * Solaris and has been adopted by Linux; the standard ELF
502 * tools are already familiar with the technique.
503 *
504 * See table 7-7 of the Solaris "Linker and Libraries Guide"
505 * (or 12-7 depending on the version of the document) for more
506 * details.
507 */
508 shdr->sh_type = SHT_NULL;
509 shdr->sh_size = ehdr->e_shnum;
510 shdr->sh_link = ehdr->e_shstrndx;
511 shdr->sh_info = numsegs + 1;
512 }
513
514 /*
515 * Fill in the program header entries.
516 */
517 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
518
519 /* The note segment. */
520 phdr->p_type = PT_NOTE;
521 phdr->p_offset = hdrsize;
522 phdr->p_vaddr = 0;
523 phdr->p_paddr = 0;
524 phdr->p_filesz = notesz;
525 phdr->p_memsz = 0;
526 phdr->p_flags = PF_R;
527 phdr->p_align = sizeof(Elf32_Size);
528 phdr++;
529
530 /* All the writable segments from the program. */
531 phc.phdr = phdr;
532 phc.offset = segoff;
533 each_dumpable_segment(map, cb_put_phdr, &phc);
534 }
535
536 /*
537 * Free the memory map.
538 */
539 static void
freemap(struct map_entry * map)540 freemap(struct map_entry *map)
541 {
542 struct map_entry *next;
543
544 while (map != NULL) {
545 next = map->next;
546 free(map);
547 map = next;
548 }
549 }
550
551 /*
552 * Read the process's memory map using kinfo_getvmmap(), and return a list of
553 * VM map entries. Only the non-device read/writable segments are
554 * returned. The map entries in the list aren't fully filled in; only
555 * the items we need are present.
556 */
557 static struct map_entry *
readmap(pid_t pid)558 readmap(pid_t pid)
559 {
560 struct map_entry *ent, **linkp, *map;
561 struct kinfo_vmentry *vmentl, *kve;
562 int i, nitems;
563
564 vmentl = kinfo_getvmmap(pid, &nitems);
565 if (vmentl == NULL)
566 err(1, "cannot retrieve mappings for %u process", pid);
567
568 map = NULL;
569 linkp = ↦
570 for (i = 0; i < nitems; i++) {
571 kve = &vmentl[i];
572
573 /*
574 * Ignore 'malformed' segments or ones representing memory
575 * mapping with MAP_NOCORE on.
576 * If the 'full' support is disabled, just dump the most
577 * meaningful data segments.
578 */
579 if ((kve->kve_protection & KVME_PROT_READ) == 0 ||
580 (kve->kve_flags & KVME_FLAG_NOCOREDUMP) != 0 ||
581 kve->kve_type == KVME_TYPE_DEAD ||
582 kve->kve_type == KVME_TYPE_UNKNOWN ||
583 ((pflags & PFLAGS_FULL) == 0 &&
584 kve->kve_type != KVME_TYPE_DEFAULT &&
585 kve->kve_type != KVME_TYPE_VNODE &&
586 kve->kve_type != KVME_TYPE_SWAP &&
587 kve->kve_type != KVME_TYPE_PHYS))
588 continue;
589
590 ent = calloc(1, sizeof(*ent));
591 if (ent == NULL)
592 errx(1, "out of memory");
593 ent->start = (vm_offset_t)kve->kve_start;
594 ent->end = (vm_offset_t)kve->kve_end;
595 ent->protection = VM_PROT_READ | VM_PROT_WRITE;
596 if ((kve->kve_protection & KVME_PROT_EXEC) != 0)
597 ent->protection |= VM_PROT_EXECUTE;
598
599 *linkp = ent;
600 linkp = &ent->next;
601 }
602 free(vmentl);
603 return (map);
604 }
605
606 /*
607 * Miscellaneous note out functions.
608 */
609
610 static void *
elf_note_prpsinfo(void * arg,size_t * sizep)611 elf_note_prpsinfo(void *arg, size_t *sizep)
612 {
613 char *cp, *end;
614 pid_t pid;
615 elfcore_prpsinfo_t *psinfo;
616 struct kinfo_proc kip;
617 size_t len;
618 int name[4];
619
620 pid = *(pid_t *)arg;
621 psinfo = calloc(1, sizeof(*psinfo));
622 if (psinfo == NULL)
623 errx(1, "out of memory");
624 psinfo->pr_version = PRPSINFO_VERSION;
625 psinfo->pr_psinfosz = sizeof(*psinfo);
626
627 name[0] = CTL_KERN;
628 name[1] = KERN_PROC;
629 name[2] = KERN_PROC_PID;
630 name[3] = pid;
631 len = sizeof(kip);
632 if (sysctl(name, 4, &kip, &len, NULL, 0) == -1)
633 err(1, "kern.proc.pid.%u", pid);
634 if (kip.ki_pid != pid)
635 err(1, "kern.proc.pid.%u", pid);
636 strlcpy(psinfo->pr_fname, kip.ki_comm, sizeof(psinfo->pr_fname));
637 name[2] = KERN_PROC_ARGS;
638 len = sizeof(psinfo->pr_psargs) - 1;
639 if (sysctl(name, 4, psinfo->pr_psargs, &len, NULL, 0) == 0 && len > 0) {
640 cp = psinfo->pr_psargs;
641 end = cp + len - 1;
642 for (;;) {
643 cp = memchr(cp, '\0', end - cp);
644 if (cp == NULL)
645 break;
646 *cp = ' ';
647 }
648 } else
649 strlcpy(psinfo->pr_psargs, kip.ki_comm,
650 sizeof(psinfo->pr_psargs));
651 psinfo->pr_pid = pid;
652
653 *sizep = sizeof(*psinfo);
654 return (psinfo);
655 }
656
657 static void *
elf_note_prstatus(void * arg,size_t * sizep)658 elf_note_prstatus(void *arg, size_t *sizep)
659 {
660 lwpid_t tid;
661 elfcore_prstatus_t *status;
662 struct reg greg;
663
664 tid = *(lwpid_t *)arg;
665 status = calloc(1, sizeof(*status));
666 if (status == NULL)
667 errx(1, "out of memory");
668 status->pr_version = PRSTATUS_VERSION;
669 status->pr_statussz = sizeof(*status);
670 status->pr_gregsetsz = sizeof(elfcore_gregset_t);
671 status->pr_fpregsetsz = sizeof(elfcore_fpregset_t);
672 status->pr_osreldate = __FreeBSD_version;
673 status->pr_pid = tid;
674 ptrace(PT_GETREGS, tid, (void *)&greg, 0);
675 elf_convert_gregset(&status->pr_reg, &greg);
676
677 *sizep = sizeof(*status);
678 return (status);
679 }
680
681 static void *
elf_note_fpregset(void * arg,size_t * sizep)682 elf_note_fpregset(void *arg, size_t *sizep)
683 {
684 lwpid_t tid;
685 elfcore_fpregset_t *fpregset;
686 fpregset_t fpreg;
687
688 tid = *(lwpid_t *)arg;
689 fpregset = calloc(1, sizeof(*fpregset));
690 if (fpregset == NULL)
691 errx(1, "out of memory");
692 ptrace(PT_GETFPREGS, tid, (void *)&fpreg, 0);
693 elf_convert_fpregset(fpregset, &fpreg);
694
695 *sizep = sizeof(*fpregset);
696 return (fpregset);
697 }
698
699 static void *
elf_note_thrmisc(void * arg,size_t * sizep)700 elf_note_thrmisc(void *arg, size_t *sizep)
701 {
702 lwpid_t tid;
703 struct ptrace_lwpinfo lwpinfo;
704 thrmisc_t *thrmisc;
705
706 tid = *(lwpid_t *)arg;
707 thrmisc = calloc(1, sizeof(*thrmisc));
708 if (thrmisc == NULL)
709 errx(1, "out of memory");
710 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo,
711 sizeof(lwpinfo));
712 memset(&thrmisc->_pad, 0, sizeof(thrmisc->_pad));
713 strcpy(thrmisc->pr_tname, lwpinfo.pl_tdname);
714
715 *sizep = sizeof(*thrmisc);
716 return (thrmisc);
717 }
718
719 static void *
elf_note_ptlwpinfo(void * arg,size_t * sizep)720 elf_note_ptlwpinfo(void *arg, size_t *sizep)
721 {
722 lwpid_t tid;
723 elfcore_lwpinfo_t *elf_info;
724 struct ptrace_lwpinfo lwpinfo;
725 void *p;
726
727 tid = *(lwpid_t *)arg;
728 p = calloc(1, sizeof(int) + sizeof(elfcore_lwpinfo_t));
729 if (p == NULL)
730 errx(1, "out of memory");
731 *(int *)p = sizeof(elfcore_lwpinfo_t);
732 elf_info = (void *)((int *)p + 1);
733 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo, sizeof(lwpinfo));
734 elf_convert_lwpinfo(elf_info, &lwpinfo);
735
736 *sizep = sizeof(int) + sizeof(struct ptrace_lwpinfo);
737 return (p);
738 }
739
740 #if defined(__arm__)
741 static void *
elf_note_arm_vfp(void * arg,size_t * sizep)742 elf_note_arm_vfp(void *arg, size_t *sizep)
743 {
744 lwpid_t tid;
745 struct vfpreg *vfp;
746 static bool has_vfp = true;
747 struct vfpreg info;
748
749 tid = *(lwpid_t *)arg;
750 if (has_vfp) {
751 if (ptrace(PT_GETVFPREGS, tid, (void *)&info, 0) != 0)
752 has_vfp = false;
753 }
754 if (!has_vfp) {
755 *sizep = 0;
756 return (NULL);
757 }
758 vfp = calloc(1, sizeof(*vfp));
759 memcpy(vfp, &info, sizeof(*vfp));
760 *sizep = sizeof(*vfp);
761 return (vfp);
762 }
763 #endif
764
765 #if defined(__i386__) || defined(__amd64__)
766 static void *
elf_note_x86_xstate(void * arg,size_t * sizep)767 elf_note_x86_xstate(void *arg, size_t *sizep)
768 {
769 lwpid_t tid;
770 char *xstate;
771 static bool xsave_checked = false;
772 static struct ptrace_xstate_info info;
773
774 tid = *(lwpid_t *)arg;
775 if (!xsave_checked) {
776 if (ptrace(PT_GETXSTATE_INFO, tid, (void *)&info,
777 sizeof(info)) != 0)
778 info.xsave_len = 0;
779 xsave_checked = true;
780 }
781 if (info.xsave_len == 0) {
782 *sizep = 0;
783 return (NULL);
784 }
785 xstate = calloc(1, info.xsave_len);
786 ptrace(PT_GETXSTATE, tid, xstate, 0);
787 *(uint64_t *)(xstate + X86_XSTATE_XCR0_OFFSET) = info.xsave_mask;
788 *sizep = info.xsave_len;
789 return (xstate);
790 }
791 #endif
792
793 #if defined(__powerpc__)
794 static void *
elf_note_powerpc_vmx(void * arg,size_t * sizep)795 elf_note_powerpc_vmx(void *arg, size_t *sizep)
796 {
797 lwpid_t tid;
798 struct vmxreg *vmx;
799 static bool has_vmx = true;
800 struct vmxreg info;
801
802 tid = *(lwpid_t *)arg;
803 if (has_vmx) {
804 if (ptrace(PT_GETVRREGS, tid, (void *)&info,
805 sizeof(info)) != 0)
806 has_vmx = false;
807 }
808 if (!has_vmx) {
809 *sizep = 0;
810 return (NULL);
811 }
812 vmx = calloc(1, sizeof(*vmx));
813 memcpy(vmx, &info, sizeof(*vmx));
814 *sizep = sizeof(*vmx);
815 return (vmx);
816 }
817
818 static void *
elf_note_powerpc_vsx(void * arg,size_t * sizep)819 elf_note_powerpc_vsx(void *arg, size_t *sizep)
820 {
821 lwpid_t tid;
822 char *vshr_data;
823 static bool has_vsx = true;
824 uint64_t vshr[32];
825
826 tid = *(lwpid_t *)arg;
827 if (has_vsx) {
828 if (ptrace(PT_GETVSRREGS, tid, (void *)vshr,
829 sizeof(vshr)) != 0)
830 has_vsx = false;
831 }
832 if (!has_vsx) {
833 *sizep = 0;
834 return (NULL);
835 }
836 vshr_data = calloc(1, sizeof(vshr));
837 memcpy(vshr_data, vshr, sizeof(vshr));
838 *sizep = sizeof(vshr);
839 return (vshr_data);
840 }
841 #endif
842
843 static void *
procstat_sysctl(void * arg,int what,size_t structsz,size_t * sizep)844 procstat_sysctl(void *arg, int what, size_t structsz, size_t *sizep)
845 {
846 size_t len;
847 pid_t pid;
848 int name[4], structsize;
849 void *buf, *p;
850
851 pid = *(pid_t *)arg;
852 structsize = structsz;
853 name[0] = CTL_KERN;
854 name[1] = KERN_PROC;
855 name[2] = what;
856 name[3] = pid;
857 len = 0;
858 if (sysctl(name, 4, NULL, &len, NULL, 0) == -1)
859 err(1, "kern.proc.%d.%u", what, pid);
860 buf = calloc(1, sizeof(structsize) + len * 4 / 3);
861 if (buf == NULL)
862 errx(1, "out of memory");
863 bcopy(&structsize, buf, sizeof(structsize));
864 p = (char *)buf + sizeof(structsize);
865 if (sysctl(name, 4, p, &len, NULL, 0) == -1)
866 err(1, "kern.proc.%d.%u", what, pid);
867
868 *sizep = sizeof(structsize) + len;
869 return (buf);
870 }
871
872 static void *
elf_note_procstat_proc(void * arg,size_t * sizep)873 elf_note_procstat_proc(void *arg, size_t *sizep)
874 {
875
876 return (procstat_sysctl(arg, KERN_PROC_PID | KERN_PROC_INC_THREAD,
877 sizeof(struct kinfo_proc), sizep));
878 }
879
880 static void *
elf_note_procstat_files(void * arg,size_t * sizep)881 elf_note_procstat_files(void *arg, size_t *sizep)
882 {
883
884 return (procstat_sysctl(arg, KERN_PROC_FILEDESC,
885 sizeof(struct kinfo_file), sizep));
886 }
887
888 static void *
elf_note_procstat_vmmap(void * arg,size_t * sizep)889 elf_note_procstat_vmmap(void *arg, size_t *sizep)
890 {
891
892 return (procstat_sysctl(arg, KERN_PROC_VMMAP,
893 sizeof(struct kinfo_vmentry), sizep));
894 }
895
896 static void *
elf_note_procstat_groups(void * arg,size_t * sizep)897 elf_note_procstat_groups(void *arg, size_t *sizep)
898 {
899
900 return (procstat_sysctl(arg, KERN_PROC_GROUPS, sizeof(gid_t), sizep));
901 }
902
903 static void *
elf_note_procstat_umask(void * arg,size_t * sizep)904 elf_note_procstat_umask(void *arg, size_t *sizep)
905 {
906
907 return (procstat_sysctl(arg, KERN_PROC_UMASK, sizeof(u_short), sizep));
908 }
909
910 static void *
elf_note_procstat_osrel(void * arg,size_t * sizep)911 elf_note_procstat_osrel(void *arg, size_t *sizep)
912 {
913
914 return (procstat_sysctl(arg, KERN_PROC_OSREL, sizeof(int), sizep));
915 }
916
917 static void *
elf_note_procstat_psstrings(void * arg,size_t * sizep)918 elf_note_procstat_psstrings(void *arg, size_t *sizep)
919 {
920
921 return (procstat_sysctl(arg, KERN_PROC_PS_STRINGS,
922 sizeof(vm_offset_t), sizep));
923 }
924
925 static void *
elf_note_procstat_auxv(void * arg,size_t * sizep)926 elf_note_procstat_auxv(void *arg, size_t *sizep)
927 {
928
929 return (procstat_sysctl(arg, KERN_PROC_AUXV,
930 sizeof(Elf_Auxinfo), sizep));
931 }
932
933 static void *
elf_note_procstat_rlimit(void * arg,size_t * sizep)934 elf_note_procstat_rlimit(void *arg, size_t *sizep)
935 {
936 pid_t pid;
937 size_t len;
938 int i, name[5], structsize;
939 void *buf, *p;
940
941 pid = *(pid_t *)arg;
942 structsize = sizeof(struct rlimit) * RLIM_NLIMITS;
943 buf = calloc(1, sizeof(structsize) + structsize);
944 if (buf == NULL)
945 errx(1, "out of memory");
946 bcopy(&structsize, buf, sizeof(structsize));
947 p = (char *)buf + sizeof(structsize);
948 name[0] = CTL_KERN;
949 name[1] = KERN_PROC;
950 name[2] = KERN_PROC_RLIMIT;
951 name[3] = pid;
952 len = sizeof(struct rlimit);
953 for (i = 0; i < RLIM_NLIMITS; i++) {
954 name[4] = i;
955 if (sysctl(name, 5, p, &len, NULL, 0) == -1)
956 err(1, "kern.proc.rlimit.%u", pid);
957 if (len != sizeof(struct rlimit))
958 errx(1, "kern.proc.rlimit.%u: short read", pid);
959 p += len;
960 }
961
962 *sizep = sizeof(structsize) + structsize;
963 return (buf);
964 }
965
966 struct dumpers __elfN(dump) = { elf_ident, elf_coredump };
967 TEXT_SET(dumpset, __elfN(dump));
968