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