1 /*- 2 * Copyright (c) 2017 Dell EMC 3 * Copyright (c) 2007 Sandvine Incorporated 4 * Copyright (c) 1998 John D. Polstra 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 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 <vm/pmap.h> 46 #include <vm/vm_map.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 typedef void (*segment_callback)(vm_map_entry_t, void *); 66 67 /* Closure for cb_put_phdr(). */ 68 struct phdr_closure { 69 Elf_Phdr *phdr; /* Program header to fill in */ 70 Elf_Off offset; /* Offset of segment in core file */ 71 }; 72 73 /* Closure for cb_size_segment(). */ 74 struct sseg_closure { 75 int count; /* Count of writable segments. */ 76 size_t size; /* Total size of all writable segments. */ 77 }; 78 79 #ifdef ELFCORE_COMPAT_32 80 typedef struct fpreg32 elfcore_fpregset_t; 81 typedef struct reg32 elfcore_gregset_t; 82 typedef struct prpsinfo32 elfcore_prpsinfo_t; 83 typedef struct prstatus32 elfcore_prstatus_t; 84 typedef struct ptrace_lwpinfo32 elfcore_lwpinfo_t; 85 static void elf_convert_gregset(elfcore_gregset_t *rd, struct reg *rs); 86 static void elf_convert_fpregset(elfcore_fpregset_t *rd, struct fpreg *rs); 87 static void elf_convert_lwpinfo(struct ptrace_lwpinfo32 *pld, 88 struct ptrace_lwpinfo *pls); 89 #else 90 typedef fpregset_t elfcore_fpregset_t; 91 typedef gregset_t elfcore_gregset_t; 92 typedef prpsinfo_t elfcore_prpsinfo_t; 93 typedef prstatus_t elfcore_prstatus_t; 94 typedef struct ptrace_lwpinfo elfcore_lwpinfo_t; 95 #define elf_convert_gregset(d,s) *d = *s 96 #define elf_convert_fpregset(d,s) *d = *s 97 #define elf_convert_lwpinfo(d,s) *d = *s 98 #endif 99 100 typedef void* (*notefunc_t)(void *, size_t *); 101 102 static void cb_put_phdr(vm_map_entry_t, void *); 103 static void cb_size_segment(vm_map_entry_t, void *); 104 static void each_dumpable_segment(vm_map_entry_t, segment_callback, 105 void *closure); 106 static void elf_detach(void); /* atexit() handler. */ 107 static void *elf_note_fpregset(void *, size_t *); 108 static void *elf_note_prpsinfo(void *, size_t *); 109 static void *elf_note_prstatus(void *, size_t *); 110 static void *elf_note_thrmisc(void *, size_t *); 111 static void *elf_note_ptlwpinfo(void *, size_t *); 112 #if defined(__arm__) 113 static void *elf_note_arm_vfp(void *, size_t *); 114 #endif 115 #if defined(__i386__) || defined(__amd64__) 116 static void *elf_note_x86_xstate(void *, size_t *); 117 #endif 118 #if defined(__powerpc__) 119 static void *elf_note_powerpc_vmx(void *, size_t *); 120 #endif 121 static void *elf_note_procstat_auxv(void *, size_t *); 122 static void *elf_note_procstat_files(void *, size_t *); 123 static void *elf_note_procstat_groups(void *, size_t *); 124 static void *elf_note_procstat_osrel(void *, size_t *); 125 static void *elf_note_procstat_proc(void *, size_t *); 126 static void *elf_note_procstat_psstrings(void *, size_t *); 127 static void *elf_note_procstat_rlimit(void *, size_t *); 128 static void *elf_note_procstat_umask(void *, size_t *); 129 static void *elf_note_procstat_vmmap(void *, size_t *); 130 static void elf_puthdr(int, pid_t, vm_map_entry_t, void *, size_t, size_t, 131 size_t, int); 132 static void elf_putnote(int, notefunc_t, void *, struct sbuf *); 133 static void elf_putnotes(pid_t, struct sbuf *, size_t *); 134 static void freemap(vm_map_entry_t); 135 static vm_map_entry_t readmap(pid_t); 136 static void *procstat_sysctl(void *, int, size_t, size_t *sizep); 137 138 static pid_t g_pid; /* Pid being dumped, global for elf_detach */ 139 static int g_status; /* proc status after ptrace attach */ 140 141 static int 142 elf_ident(int efd, pid_t pid __unused, char *binfile __unused) 143 { 144 Elf_Ehdr hdr; 145 int cnt; 146 uint16_t machine; 147 148 cnt = read(efd, &hdr, sizeof(hdr)); 149 if (cnt != sizeof(hdr)) 150 return (0); 151 if (!IS_ELF(hdr)) 152 return (0); 153 switch (hdr.e_ident[EI_DATA]) { 154 case ELFDATA2LSB: 155 machine = le16toh(hdr.e_machine); 156 break; 157 case ELFDATA2MSB: 158 machine = be16toh(hdr.e_machine); 159 break; 160 default: 161 return (0); 162 } 163 if (!ELF_MACHINE_OK(machine)) 164 return (0); 165 166 /* Looks good. */ 167 return (1); 168 } 169 170 static void 171 elf_detach(void) 172 { 173 int sig; 174 175 if (g_pid != 0) { 176 /* 177 * Forward any pending signals. SIGSTOP is generated by ptrace 178 * itself, so ignore it. 179 */ 180 sig = WIFSTOPPED(g_status) ? WSTOPSIG(g_status) : 0; 181 if (sig == SIGSTOP) 182 sig = 0; 183 ptrace(PT_DETACH, g_pid, (caddr_t)1, sig); 184 } 185 } 186 187 /* 188 * Write an ELF coredump for the given pid to the given fd. 189 */ 190 static void 191 elf_coredump(int efd, int fd, pid_t pid) 192 { 193 vm_map_entry_t map; 194 struct sseg_closure seginfo; 195 struct sbuf *sb; 196 void *hdr; 197 size_t hdrsize, notesz, segoff; 198 ssize_t n, old_len; 199 Elf_Phdr *php; 200 int i; 201 202 /* Attach to process to dump. */ 203 g_pid = pid; 204 if (atexit(elf_detach) != 0) 205 err(1, "atexit"); 206 errno = 0; 207 ptrace(PT_ATTACH, pid, NULL, 0); 208 if (errno) 209 err(1, "PT_ATTACH"); 210 if (waitpid(pid, &g_status, 0) == -1) 211 err(1, "waitpid"); 212 213 /* Get the program's memory map. */ 214 map = readmap(pid); 215 216 /* Size the program segments. */ 217 seginfo.count = 0; 218 seginfo.size = 0; 219 each_dumpable_segment(map, cb_size_segment, &seginfo); 220 221 /* 222 * Build the header and the notes using sbuf and write to the file. 223 */ 224 sb = sbuf_new_auto(); 225 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 226 if (seginfo.count + 1 >= PN_XNUM) 227 hdrsize += sizeof(Elf_Shdr); 228 /* Start header + notes section. */ 229 sbuf_start_section(sb, NULL); 230 /* Make empty header subsection. */ 231 sbuf_start_section(sb, &old_len); 232 sbuf_putc(sb, 0); 233 sbuf_end_section(sb, old_len, hdrsize, 0); 234 /* Put notes. */ 235 elf_putnotes(pid, sb, ¬esz); 236 /* Align up to a page boundary for the program segments. */ 237 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 238 if (sbuf_finish(sb) != 0) 239 err(1, "sbuf_finish"); 240 hdr = sbuf_data(sb); 241 segoff = sbuf_len(sb); 242 /* Fill in the header. */ 243 elf_puthdr(efd, pid, map, hdr, hdrsize, notesz, segoff, seginfo.count); 244 245 n = write(fd, hdr, segoff); 246 if (n == -1) 247 err(1, "write"); 248 if (n < segoff) 249 errx(1, "short write"); 250 251 /* Write the contents of all of the writable segments. */ 252 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 253 for (i = 0; i < seginfo.count; i++) { 254 struct ptrace_io_desc iorequest; 255 uintmax_t nleft = php->p_filesz; 256 257 iorequest.piod_op = PIOD_READ_D; 258 iorequest.piod_offs = (caddr_t)(uintptr_t)php->p_vaddr; 259 while (nleft > 0) { 260 char buf[8*1024]; 261 size_t nwant; 262 ssize_t ngot; 263 264 if (nleft > sizeof(buf)) 265 nwant = sizeof buf; 266 else 267 nwant = nleft; 268 iorequest.piod_addr = buf; 269 iorequest.piod_len = nwant; 270 ptrace(PT_IO, pid, (caddr_t)&iorequest, 0); 271 ngot = iorequest.piod_len; 272 if ((size_t)ngot < nwant) 273 errx(1, "short read wanted %zu, got %zd", 274 nwant, ngot); 275 ngot = write(fd, buf, nwant); 276 if (ngot == -1) 277 err(1, "write of segment %d failed", i); 278 if ((size_t)ngot != nwant) 279 errx(1, "short write"); 280 nleft -= nwant; 281 iorequest.piod_offs += ngot; 282 } 283 php++; 284 } 285 sbuf_delete(sb); 286 freemap(map); 287 } 288 289 /* 290 * A callback for each_dumpable_segment() to write out the segment's 291 * program header entry. 292 */ 293 static void 294 cb_put_phdr(vm_map_entry_t entry, void *closure) 295 { 296 struct phdr_closure *phc = (struct phdr_closure *)closure; 297 Elf_Phdr *phdr = phc->phdr; 298 299 phc->offset = round_page(phc->offset); 300 301 phdr->p_type = PT_LOAD; 302 phdr->p_offset = phc->offset; 303 phdr->p_vaddr = entry->start; 304 phdr->p_paddr = 0; 305 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 306 phdr->p_align = PAGE_SIZE; 307 phdr->p_flags = 0; 308 if (entry->protection & VM_PROT_READ) 309 phdr->p_flags |= PF_R; 310 if (entry->protection & VM_PROT_WRITE) 311 phdr->p_flags |= PF_W; 312 if (entry->protection & VM_PROT_EXECUTE) 313 phdr->p_flags |= PF_X; 314 315 phc->offset += phdr->p_filesz; 316 phc->phdr++; 317 } 318 319 /* 320 * A callback for each_dumpable_segment() to gather information about 321 * the number of segments and their total size. 322 */ 323 static void 324 cb_size_segment(vm_map_entry_t entry, void *closure) 325 { 326 struct sseg_closure *ssc = (struct sseg_closure *)closure; 327 328 ssc->count++; 329 ssc->size += entry->end - entry->start; 330 } 331 332 /* 333 * For each segment in the given memory map, call the given function 334 * with a pointer to the map entry and some arbitrary caller-supplied 335 * data. 336 */ 337 static void 338 each_dumpable_segment(vm_map_entry_t map, segment_callback func, void *closure) 339 { 340 vm_map_entry_t entry; 341 342 for (entry = map; entry != NULL; entry = entry->next) 343 (*func)(entry, closure); 344 } 345 346 static void 347 elf_putnotes(pid_t pid, struct sbuf *sb, size_t *sizep) 348 { 349 lwpid_t *tids; 350 size_t threads, old_len; 351 ssize_t size; 352 int i; 353 354 errno = 0; 355 threads = ptrace(PT_GETNUMLWPS, pid, NULL, 0); 356 if (errno) 357 err(1, "PT_GETNUMLWPS"); 358 tids = malloc(threads * sizeof(*tids)); 359 if (tids == NULL) 360 errx(1, "out of memory"); 361 errno = 0; 362 ptrace(PT_GETLWPLIST, pid, (void *)tids, threads); 363 if (errno) 364 err(1, "PT_GETLWPLIST"); 365 366 sbuf_start_section(sb, &old_len); 367 elf_putnote(NT_PRPSINFO, elf_note_prpsinfo, &pid, sb); 368 369 for (i = 0; i < threads; ++i) { 370 elf_putnote(NT_PRSTATUS, elf_note_prstatus, tids + i, sb); 371 elf_putnote(NT_FPREGSET, elf_note_fpregset, tids + i, sb); 372 elf_putnote(NT_THRMISC, elf_note_thrmisc, tids + i, sb); 373 elf_putnote(NT_PTLWPINFO, elf_note_ptlwpinfo, tids + i, sb); 374 #if defined(__arm__) 375 elf_putnote(NT_ARM_VFP, elf_note_arm_vfp, tids + i, sb); 376 #endif 377 #if defined(__i386__) || defined(__amd64__) 378 elf_putnote(NT_X86_XSTATE, elf_note_x86_xstate, tids + i, sb); 379 #endif 380 #if defined(__powerpc__) 381 elf_putnote(NT_PPC_VMX, elf_note_powerpc_vmx, tids + i, sb); 382 #endif 383 } 384 385 #ifndef ELFCORE_COMPAT_32 386 elf_putnote(NT_PROCSTAT_PROC, elf_note_procstat_proc, &pid, sb); 387 elf_putnote(NT_PROCSTAT_FILES, elf_note_procstat_files, &pid, sb); 388 elf_putnote(NT_PROCSTAT_VMMAP, elf_note_procstat_vmmap, &pid, sb); 389 elf_putnote(NT_PROCSTAT_GROUPS, elf_note_procstat_groups, &pid, sb); 390 elf_putnote(NT_PROCSTAT_UMASK, elf_note_procstat_umask, &pid, sb); 391 elf_putnote(NT_PROCSTAT_RLIMIT, elf_note_procstat_rlimit, &pid, sb); 392 elf_putnote(NT_PROCSTAT_OSREL, elf_note_procstat_osrel, &pid, sb); 393 elf_putnote(NT_PROCSTAT_PSSTRINGS, elf_note_procstat_psstrings, &pid, 394 sb); 395 elf_putnote(NT_PROCSTAT_AUXV, elf_note_procstat_auxv, &pid, sb); 396 #endif 397 398 size = sbuf_end_section(sb, old_len, 1, 0); 399 if (size == -1) 400 err(1, "sbuf_end_section"); 401 free(tids); 402 *sizep = size; 403 } 404 405 /* 406 * Emit one note section to sbuf. 407 */ 408 static void 409 elf_putnote(int type, notefunc_t notefunc, void *arg, struct sbuf *sb) 410 { 411 Elf_Note note; 412 size_t descsz; 413 ssize_t old_len; 414 void *desc; 415 416 desc = notefunc(arg, &descsz); 417 note.n_namesz = 8; /* strlen("FreeBSD") + 1 */ 418 note.n_descsz = descsz; 419 note.n_type = type; 420 421 sbuf_bcat(sb, ¬e, sizeof(note)); 422 sbuf_start_section(sb, &old_len); 423 sbuf_bcat(sb, "FreeBSD", note.n_namesz); 424 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0); 425 if (descsz == 0) 426 return; 427 sbuf_start_section(sb, &old_len); 428 sbuf_bcat(sb, desc, descsz); 429 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0); 430 free(desc); 431 } 432 433 /* 434 * Generate the ELF coredump header. 435 */ 436 static void 437 elf_puthdr(int efd, pid_t pid, vm_map_entry_t map, void *hdr, size_t hdrsize, 438 size_t notesz, size_t segoff, int numsegs) 439 { 440 Elf_Ehdr *ehdr, binhdr; 441 Elf_Phdr *phdr; 442 Elf_Shdr *shdr; 443 struct phdr_closure phc; 444 ssize_t cnt; 445 446 cnt = read(efd, &binhdr, sizeof(binhdr)); 447 if (cnt < 0) 448 err(1, "Failed to re-read ELF header"); 449 else if (cnt != sizeof(binhdr)) 450 errx(1, "Failed to re-read ELF header"); 451 452 ehdr = (Elf_Ehdr *)hdr; 453 454 ehdr->e_ident[EI_MAG0] = ELFMAG0; 455 ehdr->e_ident[EI_MAG1] = ELFMAG1; 456 ehdr->e_ident[EI_MAG2] = ELFMAG2; 457 ehdr->e_ident[EI_MAG3] = ELFMAG3; 458 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 459 ehdr->e_ident[EI_DATA] = ELF_DATA; 460 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 461 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 462 ehdr->e_ident[EI_ABIVERSION] = 0; 463 ehdr->e_ident[EI_PAD] = 0; 464 ehdr->e_type = ET_CORE; 465 ehdr->e_machine = binhdr.e_machine; 466 ehdr->e_version = EV_CURRENT; 467 ehdr->e_entry = 0; 468 ehdr->e_phoff = sizeof(Elf_Ehdr); 469 ehdr->e_flags = binhdr.e_flags; 470 ehdr->e_ehsize = sizeof(Elf_Ehdr); 471 ehdr->e_phentsize = sizeof(Elf_Phdr); 472 ehdr->e_shentsize = sizeof(Elf_Shdr); 473 ehdr->e_shstrndx = SHN_UNDEF; 474 if (numsegs + 1 < PN_XNUM) { 475 ehdr->e_phnum = numsegs + 1; 476 ehdr->e_shnum = 0; 477 } else { 478 ehdr->e_phnum = PN_XNUM; 479 ehdr->e_shnum = 1; 480 481 ehdr->e_shoff = ehdr->e_phoff + 482 (numsegs + 1) * ehdr->e_phentsize; 483 484 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 485 memset(shdr, 0, sizeof(*shdr)); 486 /* 487 * A special first section is used to hold large segment and 488 * section counts. This was proposed by Sun Microsystems in 489 * Solaris and has been adopted by Linux; the standard ELF 490 * tools are already familiar with the technique. 491 * 492 * See table 7-7 of the Solaris "Linker and Libraries Guide" 493 * (or 12-7 depending on the version of the document) for more 494 * details. 495 */ 496 shdr->sh_type = SHT_NULL; 497 shdr->sh_size = ehdr->e_shnum; 498 shdr->sh_link = ehdr->e_shstrndx; 499 shdr->sh_info = numsegs + 1; 500 } 501 502 /* 503 * Fill in the program header entries. 504 */ 505 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 506 507 /* The note segement. */ 508 phdr->p_type = PT_NOTE; 509 phdr->p_offset = hdrsize; 510 phdr->p_vaddr = 0; 511 phdr->p_paddr = 0; 512 phdr->p_filesz = notesz; 513 phdr->p_memsz = 0; 514 phdr->p_flags = PF_R; 515 phdr->p_align = sizeof(Elf32_Size); 516 phdr++; 517 518 /* All the writable segments from the program. */ 519 phc.phdr = phdr; 520 phc.offset = segoff; 521 each_dumpable_segment(map, cb_put_phdr, &phc); 522 } 523 524 /* 525 * Free the memory map. 526 */ 527 static void 528 freemap(vm_map_entry_t map) 529 { 530 531 while (map != NULL) { 532 vm_map_entry_t next = map->next; 533 free(map); 534 map = next; 535 } 536 } 537 538 /* 539 * Read the process's memory map using kinfo_getvmmap(), and return a list of 540 * VM map entries. Only the non-device read/writable segments are 541 * returned. The map entries in the list aren't fully filled in; only 542 * the items we need are present. 543 */ 544 static vm_map_entry_t 545 readmap(pid_t pid) 546 { 547 vm_map_entry_t ent, *linkp, map; 548 struct kinfo_vmentry *vmentl, *kve; 549 int i, nitems; 550 551 vmentl = kinfo_getvmmap(pid, &nitems); 552 if (vmentl == NULL) 553 err(1, "cannot retrieve mappings for %u process", pid); 554 555 map = NULL; 556 linkp = ↦ 557 for (i = 0; i < nitems; i++) { 558 kve = &vmentl[i]; 559 560 /* 561 * Ignore 'malformed' segments or ones representing memory 562 * mapping with MAP_NOCORE on. 563 * If the 'full' support is disabled, just dump the most 564 * meaningful data segments. 565 */ 566 if ((kve->kve_protection & KVME_PROT_READ) == 0 || 567 (kve->kve_flags & KVME_FLAG_NOCOREDUMP) != 0 || 568 kve->kve_type == KVME_TYPE_DEAD || 569 kve->kve_type == KVME_TYPE_UNKNOWN || 570 ((pflags & PFLAGS_FULL) == 0 && 571 kve->kve_type != KVME_TYPE_DEFAULT && 572 kve->kve_type != KVME_TYPE_VNODE && 573 kve->kve_type != KVME_TYPE_SWAP && 574 kve->kve_type != KVME_TYPE_PHYS)) 575 continue; 576 577 ent = calloc(1, sizeof(*ent)); 578 if (ent == NULL) 579 errx(1, "out of memory"); 580 ent->start = (vm_offset_t)kve->kve_start; 581 ent->end = (vm_offset_t)kve->kve_end; 582 ent->protection = VM_PROT_READ | VM_PROT_WRITE; 583 if ((kve->kve_protection & KVME_PROT_EXEC) != 0) 584 ent->protection |= VM_PROT_EXECUTE; 585 586 *linkp = ent; 587 linkp = &ent->next; 588 } 589 free(vmentl); 590 return (map); 591 } 592 593 /* 594 * Miscellaneous note out functions. 595 */ 596 597 static void * 598 elf_note_prpsinfo(void *arg, size_t *sizep) 599 { 600 char *cp, *end; 601 pid_t pid; 602 elfcore_prpsinfo_t *psinfo; 603 struct kinfo_proc kip; 604 size_t len; 605 int name[4]; 606 607 pid = *(pid_t *)arg; 608 psinfo = calloc(1, sizeof(*psinfo)); 609 if (psinfo == NULL) 610 errx(1, "out of memory"); 611 psinfo->pr_version = PRPSINFO_VERSION; 612 psinfo->pr_psinfosz = sizeof(*psinfo); 613 614 name[0] = CTL_KERN; 615 name[1] = KERN_PROC; 616 name[2] = KERN_PROC_PID; 617 name[3] = pid; 618 len = sizeof(kip); 619 if (sysctl(name, 4, &kip, &len, NULL, 0) == -1) 620 err(1, "kern.proc.pid.%u", pid); 621 if (kip.ki_pid != pid) 622 err(1, "kern.proc.pid.%u", pid); 623 strlcpy(psinfo->pr_fname, kip.ki_comm, sizeof(psinfo->pr_fname)); 624 name[2] = KERN_PROC_ARGS; 625 len = sizeof(psinfo->pr_psargs) - 1; 626 if (sysctl(name, 4, psinfo->pr_psargs, &len, NULL, 0) == 0 && len > 0) { 627 cp = psinfo->pr_psargs; 628 end = cp + len - 1; 629 for (;;) { 630 cp = memchr(cp, '\0', end - cp); 631 if (cp == NULL) 632 break; 633 *cp = ' '; 634 } 635 } else 636 strlcpy(psinfo->pr_psargs, kip.ki_comm, 637 sizeof(psinfo->pr_psargs)); 638 psinfo->pr_pid = pid; 639 640 *sizep = sizeof(*psinfo); 641 return (psinfo); 642 } 643 644 static void * 645 elf_note_prstatus(void *arg, size_t *sizep) 646 { 647 lwpid_t tid; 648 elfcore_prstatus_t *status; 649 struct reg greg; 650 651 tid = *(lwpid_t *)arg; 652 status = calloc(1, sizeof(*status)); 653 if (status == NULL) 654 errx(1, "out of memory"); 655 status->pr_version = PRSTATUS_VERSION; 656 status->pr_statussz = sizeof(*status); 657 status->pr_gregsetsz = sizeof(elfcore_gregset_t); 658 status->pr_fpregsetsz = sizeof(elfcore_fpregset_t); 659 status->pr_osreldate = __FreeBSD_version; 660 status->pr_pid = tid; 661 ptrace(PT_GETREGS, tid, (void *)&greg, 0); 662 elf_convert_gregset(&status->pr_reg, &greg); 663 664 *sizep = sizeof(*status); 665 return (status); 666 } 667 668 static void * 669 elf_note_fpregset(void *arg, size_t *sizep) 670 { 671 lwpid_t tid; 672 elfcore_fpregset_t *fpregset; 673 fpregset_t fpreg; 674 675 tid = *(lwpid_t *)arg; 676 fpregset = calloc(1, sizeof(*fpregset)); 677 if (fpregset == NULL) 678 errx(1, "out of memory"); 679 ptrace(PT_GETFPREGS, tid, (void *)&fpreg, 0); 680 elf_convert_fpregset(fpregset, &fpreg); 681 682 *sizep = sizeof(*fpregset); 683 return (fpregset); 684 } 685 686 static void * 687 elf_note_thrmisc(void *arg, size_t *sizep) 688 { 689 lwpid_t tid; 690 struct ptrace_lwpinfo lwpinfo; 691 thrmisc_t *thrmisc; 692 693 tid = *(lwpid_t *)arg; 694 thrmisc = calloc(1, sizeof(*thrmisc)); 695 if (thrmisc == NULL) 696 errx(1, "out of memory"); 697 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo, 698 sizeof(lwpinfo)); 699 memset(&thrmisc->_pad, 0, sizeof(thrmisc->_pad)); 700 strcpy(thrmisc->pr_tname, lwpinfo.pl_tdname); 701 702 *sizep = sizeof(*thrmisc); 703 return (thrmisc); 704 } 705 706 static void * 707 elf_note_ptlwpinfo(void *arg, size_t *sizep) 708 { 709 lwpid_t tid; 710 elfcore_lwpinfo_t *elf_info; 711 struct ptrace_lwpinfo lwpinfo; 712 void *p; 713 714 tid = *(lwpid_t *)arg; 715 p = calloc(1, sizeof(int) + sizeof(elfcore_lwpinfo_t)); 716 if (p == NULL) 717 errx(1, "out of memory"); 718 *(int *)p = sizeof(elfcore_lwpinfo_t); 719 elf_info = (void *)((int *)p + 1); 720 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo, sizeof(lwpinfo)); 721 elf_convert_lwpinfo(elf_info, &lwpinfo); 722 723 *sizep = sizeof(int) + sizeof(struct ptrace_lwpinfo); 724 return (p); 725 } 726 727 #if defined(__arm__) 728 static void * 729 elf_note_arm_vfp(void *arg, size_t *sizep) 730 { 731 lwpid_t tid; 732 struct vfpreg *vfp; 733 static bool has_vfp = true; 734 struct vfpreg info; 735 736 tid = *(lwpid_t *)arg; 737 if (has_vfp) { 738 if (ptrace(PT_GETVFPREGS, tid, (void *)&info, 0) != 0) 739 has_vfp = false; 740 } 741 if (!has_vfp) { 742 *sizep = 0; 743 return (NULL); 744 } 745 vfp = calloc(1, sizeof(*vfp)); 746 memcpy(vfp, &info, sizeof(*vfp)); 747 *sizep = sizeof(*vfp); 748 return (vfp); 749 } 750 #endif 751 752 #if defined(__i386__) || defined(__amd64__) 753 static void * 754 elf_note_x86_xstate(void *arg, size_t *sizep) 755 { 756 lwpid_t tid; 757 char *xstate; 758 static bool xsave_checked = false; 759 static struct ptrace_xstate_info info; 760 761 tid = *(lwpid_t *)arg; 762 if (!xsave_checked) { 763 if (ptrace(PT_GETXSTATE_INFO, tid, (void *)&info, 764 sizeof(info)) != 0) 765 info.xsave_len = 0; 766 xsave_checked = true; 767 } 768 if (info.xsave_len == 0) { 769 *sizep = 0; 770 return (NULL); 771 } 772 xstate = calloc(1, info.xsave_len); 773 ptrace(PT_GETXSTATE, tid, xstate, 0); 774 *(uint64_t *)(xstate + X86_XSTATE_XCR0_OFFSET) = info.xsave_mask; 775 *sizep = info.xsave_len; 776 return (xstate); 777 } 778 #endif 779 780 #if defined(__powerpc__) 781 static void * 782 elf_note_powerpc_vmx(void *arg, size_t *sizep) 783 { 784 lwpid_t tid; 785 struct vmxreg *vmx; 786 static bool has_vmx = true; 787 struct vmxreg info; 788 789 tid = *(lwpid_t *)arg; 790 if (has_vmx) { 791 if (ptrace(PT_GETVRREGS, tid, (void *)&info, 792 sizeof(info)) != 0) 793 has_vmx = false; 794 } 795 if (!has_vmx) { 796 *sizep = 0; 797 return (NULL); 798 } 799 vmx = calloc(1, sizeof(*vmx)); 800 memcpy(vmx, &info, sizeof(*vmx)); 801 *sizep = sizeof(*vmx); 802 return (vmx); 803 } 804 #endif 805 806 static void * 807 procstat_sysctl(void *arg, int what, size_t structsz, size_t *sizep) 808 { 809 size_t len; 810 pid_t pid; 811 int name[4], structsize; 812 void *buf, *p; 813 814 pid = *(pid_t *)arg; 815 structsize = structsz; 816 name[0] = CTL_KERN; 817 name[1] = KERN_PROC; 818 name[2] = what; 819 name[3] = pid; 820 len = 0; 821 if (sysctl(name, 4, NULL, &len, NULL, 0) == -1) 822 err(1, "kern.proc.%d.%u", what, pid); 823 buf = calloc(1, sizeof(structsize) + len * 4 / 3); 824 if (buf == NULL) 825 errx(1, "out of memory"); 826 bcopy(&structsize, buf, sizeof(structsize)); 827 p = (char *)buf + sizeof(structsize); 828 if (sysctl(name, 4, p, &len, NULL, 0) == -1) 829 err(1, "kern.proc.%d.%u", what, pid); 830 831 *sizep = sizeof(structsize) + len; 832 return (buf); 833 } 834 835 static void * 836 elf_note_procstat_proc(void *arg, size_t *sizep) 837 { 838 839 return (procstat_sysctl(arg, KERN_PROC_PID | KERN_PROC_INC_THREAD, 840 sizeof(struct kinfo_proc), sizep)); 841 } 842 843 static void * 844 elf_note_procstat_files(void *arg, size_t *sizep) 845 { 846 847 return (procstat_sysctl(arg, KERN_PROC_FILEDESC, 848 sizeof(struct kinfo_file), sizep)); 849 } 850 851 static void * 852 elf_note_procstat_vmmap(void *arg, size_t *sizep) 853 { 854 855 return (procstat_sysctl(arg, KERN_PROC_VMMAP, 856 sizeof(struct kinfo_vmentry), sizep)); 857 } 858 859 static void * 860 elf_note_procstat_groups(void *arg, size_t *sizep) 861 { 862 863 return (procstat_sysctl(arg, KERN_PROC_GROUPS, sizeof(gid_t), sizep)); 864 } 865 866 static void * 867 elf_note_procstat_umask(void *arg, size_t *sizep) 868 { 869 870 return (procstat_sysctl(arg, KERN_PROC_UMASK, sizeof(u_short), sizep)); 871 } 872 873 static void * 874 elf_note_procstat_osrel(void *arg, size_t *sizep) 875 { 876 877 return (procstat_sysctl(arg, KERN_PROC_OSREL, sizeof(int), sizep)); 878 } 879 880 static void * 881 elf_note_procstat_psstrings(void *arg, size_t *sizep) 882 { 883 884 return (procstat_sysctl(arg, KERN_PROC_PS_STRINGS, 885 sizeof(vm_offset_t), sizep)); 886 } 887 888 static void * 889 elf_note_procstat_auxv(void *arg, size_t *sizep) 890 { 891 892 return (procstat_sysctl(arg, KERN_PROC_AUXV, 893 sizeof(Elf_Auxinfo), sizep)); 894 } 895 896 static void * 897 elf_note_procstat_rlimit(void *arg, size_t *sizep) 898 { 899 pid_t pid; 900 size_t len; 901 int i, name[5], structsize; 902 void *buf, *p; 903 904 pid = *(pid_t *)arg; 905 structsize = sizeof(struct rlimit) * RLIM_NLIMITS; 906 buf = calloc(1, sizeof(structsize) + structsize); 907 if (buf == NULL) 908 errx(1, "out of memory"); 909 bcopy(&structsize, buf, sizeof(structsize)); 910 p = (char *)buf + sizeof(structsize); 911 name[0] = CTL_KERN; 912 name[1] = KERN_PROC; 913 name[2] = KERN_PROC_RLIMIT; 914 name[3] = pid; 915 len = sizeof(struct rlimit); 916 for (i = 0; i < RLIM_NLIMITS; i++) { 917 name[4] = i; 918 if (sysctl(name, 5, p, &len, NULL, 0) == -1) 919 err(1, "kern.proc.rlimit.%u", pid); 920 if (len != sizeof(struct rlimit)) 921 errx(1, "kern.proc.rlimit.%u: short read", pid); 922 p += len; 923 } 924 925 *sizep = sizeof(structsize) + structsize; 926 return (buf); 927 } 928 929 struct dumpers __elfN(dump) = { elf_ident, elf_coredump }; 930 TEXT_SET(dumpset, __elfN(dump)); 931