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 elf_putnote(NT_PPC_VSX, elf_note_powerpc_vsx, tids + i, sb); 386 #endif 387 } 388 389 #ifndef ELFCORE_COMPAT_32 390 elf_putnote(NT_PROCSTAT_PROC, elf_note_procstat_proc, &pid, sb); 391 elf_putnote(NT_PROCSTAT_FILES, elf_note_procstat_files, &pid, sb); 392 elf_putnote(NT_PROCSTAT_VMMAP, elf_note_procstat_vmmap, &pid, sb); 393 elf_putnote(NT_PROCSTAT_GROUPS, elf_note_procstat_groups, &pid, sb); 394 elf_putnote(NT_PROCSTAT_UMASK, elf_note_procstat_umask, &pid, sb); 395 elf_putnote(NT_PROCSTAT_RLIMIT, elf_note_procstat_rlimit, &pid, sb); 396 elf_putnote(NT_PROCSTAT_OSREL, elf_note_procstat_osrel, &pid, sb); 397 elf_putnote(NT_PROCSTAT_PSSTRINGS, elf_note_procstat_psstrings, &pid, 398 sb); 399 elf_putnote(NT_PROCSTAT_AUXV, elf_note_procstat_auxv, &pid, sb); 400 #endif 401 402 size = sbuf_end_section(sb, old_len, 1, 0); 403 if (size == -1) 404 err(1, "sbuf_end_section"); 405 free(tids); 406 *sizep = size; 407 } 408 409 /* 410 * Emit one note section to sbuf. 411 */ 412 static void 413 elf_putnote(int type, notefunc_t notefunc, void *arg, struct sbuf *sb) 414 { 415 Elf_Note note; 416 size_t descsz; 417 ssize_t old_len; 418 void *desc; 419 420 desc = notefunc(arg, &descsz); 421 note.n_namesz = 8; /* strlen("FreeBSD") + 1 */ 422 note.n_descsz = descsz; 423 note.n_type = type; 424 425 sbuf_bcat(sb, ¬e, sizeof(note)); 426 sbuf_start_section(sb, &old_len); 427 sbuf_bcat(sb, "FreeBSD", note.n_namesz); 428 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0); 429 if (descsz == 0) 430 return; 431 sbuf_start_section(sb, &old_len); 432 sbuf_bcat(sb, desc, descsz); 433 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0); 434 free(desc); 435 } 436 437 /* 438 * Generate the ELF coredump header. 439 */ 440 static void 441 elf_puthdr(int efd, pid_t pid, vm_map_entry_t map, void *hdr, size_t hdrsize, 442 size_t notesz, size_t segoff, int numsegs) 443 { 444 Elf_Ehdr *ehdr, binhdr; 445 Elf_Phdr *phdr; 446 Elf_Shdr *shdr; 447 struct phdr_closure phc; 448 ssize_t cnt; 449 450 cnt = read(efd, &binhdr, sizeof(binhdr)); 451 if (cnt < 0) 452 err(1, "Failed to re-read ELF header"); 453 else if (cnt != sizeof(binhdr)) 454 errx(1, "Failed to re-read ELF header"); 455 456 ehdr = (Elf_Ehdr *)hdr; 457 458 ehdr->e_ident[EI_MAG0] = ELFMAG0; 459 ehdr->e_ident[EI_MAG1] = ELFMAG1; 460 ehdr->e_ident[EI_MAG2] = ELFMAG2; 461 ehdr->e_ident[EI_MAG3] = ELFMAG3; 462 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 463 ehdr->e_ident[EI_DATA] = ELF_DATA; 464 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 465 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 466 ehdr->e_ident[EI_ABIVERSION] = 0; 467 ehdr->e_ident[EI_PAD] = 0; 468 ehdr->e_type = ET_CORE; 469 ehdr->e_machine = binhdr.e_machine; 470 ehdr->e_version = EV_CURRENT; 471 ehdr->e_entry = 0; 472 ehdr->e_phoff = sizeof(Elf_Ehdr); 473 ehdr->e_flags = binhdr.e_flags; 474 ehdr->e_ehsize = sizeof(Elf_Ehdr); 475 ehdr->e_phentsize = sizeof(Elf_Phdr); 476 ehdr->e_shentsize = sizeof(Elf_Shdr); 477 ehdr->e_shstrndx = SHN_UNDEF; 478 if (numsegs + 1 < PN_XNUM) { 479 ehdr->e_phnum = numsegs + 1; 480 ehdr->e_shnum = 0; 481 } else { 482 ehdr->e_phnum = PN_XNUM; 483 ehdr->e_shnum = 1; 484 485 ehdr->e_shoff = ehdr->e_phoff + 486 (numsegs + 1) * ehdr->e_phentsize; 487 488 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 489 memset(shdr, 0, sizeof(*shdr)); 490 /* 491 * A special first section is used to hold large segment and 492 * section counts. This was proposed by Sun Microsystems in 493 * Solaris and has been adopted by Linux; the standard ELF 494 * tools are already familiar with the technique. 495 * 496 * See table 7-7 of the Solaris "Linker and Libraries Guide" 497 * (or 12-7 depending on the version of the document) for more 498 * details. 499 */ 500 shdr->sh_type = SHT_NULL; 501 shdr->sh_size = ehdr->e_shnum; 502 shdr->sh_link = ehdr->e_shstrndx; 503 shdr->sh_info = numsegs + 1; 504 } 505 506 /* 507 * Fill in the program header entries. 508 */ 509 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 510 511 /* The note segement. */ 512 phdr->p_type = PT_NOTE; 513 phdr->p_offset = hdrsize; 514 phdr->p_vaddr = 0; 515 phdr->p_paddr = 0; 516 phdr->p_filesz = notesz; 517 phdr->p_memsz = 0; 518 phdr->p_flags = PF_R; 519 phdr->p_align = sizeof(Elf32_Size); 520 phdr++; 521 522 /* All the writable segments from the program. */ 523 phc.phdr = phdr; 524 phc.offset = segoff; 525 each_dumpable_segment(map, cb_put_phdr, &phc); 526 } 527 528 /* 529 * Free the memory map. 530 */ 531 static void 532 freemap(vm_map_entry_t map) 533 { 534 535 while (map != NULL) { 536 vm_map_entry_t next = map->next; 537 free(map); 538 map = next; 539 } 540 } 541 542 /* 543 * Read the process's memory map using kinfo_getvmmap(), and return a list of 544 * VM map entries. Only the non-device read/writable segments are 545 * returned. The map entries in the list aren't fully filled in; only 546 * the items we need are present. 547 */ 548 static vm_map_entry_t 549 readmap(pid_t pid) 550 { 551 vm_map_entry_t ent, *linkp, map; 552 struct kinfo_vmentry *vmentl, *kve; 553 int i, nitems; 554 555 vmentl = kinfo_getvmmap(pid, &nitems); 556 if (vmentl == NULL) 557 err(1, "cannot retrieve mappings for %u process", pid); 558 559 map = NULL; 560 linkp = ↦ 561 for (i = 0; i < nitems; i++) { 562 kve = &vmentl[i]; 563 564 /* 565 * Ignore 'malformed' segments or ones representing memory 566 * mapping with MAP_NOCORE on. 567 * If the 'full' support is disabled, just dump the most 568 * meaningful data segments. 569 */ 570 if ((kve->kve_protection & KVME_PROT_READ) == 0 || 571 (kve->kve_flags & KVME_FLAG_NOCOREDUMP) != 0 || 572 kve->kve_type == KVME_TYPE_DEAD || 573 kve->kve_type == KVME_TYPE_UNKNOWN || 574 ((pflags & PFLAGS_FULL) == 0 && 575 kve->kve_type != KVME_TYPE_DEFAULT && 576 kve->kve_type != KVME_TYPE_VNODE && 577 kve->kve_type != KVME_TYPE_SWAP && 578 kve->kve_type != KVME_TYPE_PHYS)) 579 continue; 580 581 ent = calloc(1, sizeof(*ent)); 582 if (ent == NULL) 583 errx(1, "out of memory"); 584 ent->start = (vm_offset_t)kve->kve_start; 585 ent->end = (vm_offset_t)kve->kve_end; 586 ent->protection = VM_PROT_READ | VM_PROT_WRITE; 587 if ((kve->kve_protection & KVME_PROT_EXEC) != 0) 588 ent->protection |= VM_PROT_EXECUTE; 589 590 *linkp = ent; 591 linkp = &ent->next; 592 } 593 free(vmentl); 594 return (map); 595 } 596 597 /* 598 * Miscellaneous note out functions. 599 */ 600 601 static void * 602 elf_note_prpsinfo(void *arg, size_t *sizep) 603 { 604 char *cp, *end; 605 pid_t pid; 606 elfcore_prpsinfo_t *psinfo; 607 struct kinfo_proc kip; 608 size_t len; 609 int name[4]; 610 611 pid = *(pid_t *)arg; 612 psinfo = calloc(1, sizeof(*psinfo)); 613 if (psinfo == NULL) 614 errx(1, "out of memory"); 615 psinfo->pr_version = PRPSINFO_VERSION; 616 psinfo->pr_psinfosz = sizeof(*psinfo); 617 618 name[0] = CTL_KERN; 619 name[1] = KERN_PROC; 620 name[2] = KERN_PROC_PID; 621 name[3] = pid; 622 len = sizeof(kip); 623 if (sysctl(name, 4, &kip, &len, NULL, 0) == -1) 624 err(1, "kern.proc.pid.%u", pid); 625 if (kip.ki_pid != pid) 626 err(1, "kern.proc.pid.%u", pid); 627 strlcpy(psinfo->pr_fname, kip.ki_comm, sizeof(psinfo->pr_fname)); 628 name[2] = KERN_PROC_ARGS; 629 len = sizeof(psinfo->pr_psargs) - 1; 630 if (sysctl(name, 4, psinfo->pr_psargs, &len, NULL, 0) == 0 && len > 0) { 631 cp = psinfo->pr_psargs; 632 end = cp + len - 1; 633 for (;;) { 634 cp = memchr(cp, '\0', end - cp); 635 if (cp == NULL) 636 break; 637 *cp = ' '; 638 } 639 } else 640 strlcpy(psinfo->pr_psargs, kip.ki_comm, 641 sizeof(psinfo->pr_psargs)); 642 psinfo->pr_pid = pid; 643 644 *sizep = sizeof(*psinfo); 645 return (psinfo); 646 } 647 648 static void * 649 elf_note_prstatus(void *arg, size_t *sizep) 650 { 651 lwpid_t tid; 652 elfcore_prstatus_t *status; 653 struct reg greg; 654 655 tid = *(lwpid_t *)arg; 656 status = calloc(1, sizeof(*status)); 657 if (status == NULL) 658 errx(1, "out of memory"); 659 status->pr_version = PRSTATUS_VERSION; 660 status->pr_statussz = sizeof(*status); 661 status->pr_gregsetsz = sizeof(elfcore_gregset_t); 662 status->pr_fpregsetsz = sizeof(elfcore_fpregset_t); 663 status->pr_osreldate = __FreeBSD_version; 664 status->pr_pid = tid; 665 ptrace(PT_GETREGS, tid, (void *)&greg, 0); 666 elf_convert_gregset(&status->pr_reg, &greg); 667 668 *sizep = sizeof(*status); 669 return (status); 670 } 671 672 static void * 673 elf_note_fpregset(void *arg, size_t *sizep) 674 { 675 lwpid_t tid; 676 elfcore_fpregset_t *fpregset; 677 fpregset_t fpreg; 678 679 tid = *(lwpid_t *)arg; 680 fpregset = calloc(1, sizeof(*fpregset)); 681 if (fpregset == NULL) 682 errx(1, "out of memory"); 683 ptrace(PT_GETFPREGS, tid, (void *)&fpreg, 0); 684 elf_convert_fpregset(fpregset, &fpreg); 685 686 *sizep = sizeof(*fpregset); 687 return (fpregset); 688 } 689 690 static void * 691 elf_note_thrmisc(void *arg, size_t *sizep) 692 { 693 lwpid_t tid; 694 struct ptrace_lwpinfo lwpinfo; 695 thrmisc_t *thrmisc; 696 697 tid = *(lwpid_t *)arg; 698 thrmisc = calloc(1, sizeof(*thrmisc)); 699 if (thrmisc == NULL) 700 errx(1, "out of memory"); 701 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo, 702 sizeof(lwpinfo)); 703 memset(&thrmisc->_pad, 0, sizeof(thrmisc->_pad)); 704 strcpy(thrmisc->pr_tname, lwpinfo.pl_tdname); 705 706 *sizep = sizeof(*thrmisc); 707 return (thrmisc); 708 } 709 710 static void * 711 elf_note_ptlwpinfo(void *arg, size_t *sizep) 712 { 713 lwpid_t tid; 714 elfcore_lwpinfo_t *elf_info; 715 struct ptrace_lwpinfo lwpinfo; 716 void *p; 717 718 tid = *(lwpid_t *)arg; 719 p = calloc(1, sizeof(int) + sizeof(elfcore_lwpinfo_t)); 720 if (p == NULL) 721 errx(1, "out of memory"); 722 *(int *)p = sizeof(elfcore_lwpinfo_t); 723 elf_info = (void *)((int *)p + 1); 724 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo, sizeof(lwpinfo)); 725 elf_convert_lwpinfo(elf_info, &lwpinfo); 726 727 *sizep = sizeof(int) + sizeof(struct ptrace_lwpinfo); 728 return (p); 729 } 730 731 #if defined(__arm__) 732 static void * 733 elf_note_arm_vfp(void *arg, size_t *sizep) 734 { 735 lwpid_t tid; 736 struct vfpreg *vfp; 737 static bool has_vfp = true; 738 struct vfpreg info; 739 740 tid = *(lwpid_t *)arg; 741 if (has_vfp) { 742 if (ptrace(PT_GETVFPREGS, tid, (void *)&info, 0) != 0) 743 has_vfp = false; 744 } 745 if (!has_vfp) { 746 *sizep = 0; 747 return (NULL); 748 } 749 vfp = calloc(1, sizeof(*vfp)); 750 memcpy(vfp, &info, sizeof(*vfp)); 751 *sizep = sizeof(*vfp); 752 return (vfp); 753 } 754 #endif 755 756 #if defined(__i386__) || defined(__amd64__) 757 static void * 758 elf_note_x86_xstate(void *arg, size_t *sizep) 759 { 760 lwpid_t tid; 761 char *xstate; 762 static bool xsave_checked = false; 763 static struct ptrace_xstate_info info; 764 765 tid = *(lwpid_t *)arg; 766 if (!xsave_checked) { 767 if (ptrace(PT_GETXSTATE_INFO, tid, (void *)&info, 768 sizeof(info)) != 0) 769 info.xsave_len = 0; 770 xsave_checked = true; 771 } 772 if (info.xsave_len == 0) { 773 *sizep = 0; 774 return (NULL); 775 } 776 xstate = calloc(1, info.xsave_len); 777 ptrace(PT_GETXSTATE, tid, xstate, 0); 778 *(uint64_t *)(xstate + X86_XSTATE_XCR0_OFFSET) = info.xsave_mask; 779 *sizep = info.xsave_len; 780 return (xstate); 781 } 782 #endif 783 784 #if defined(__powerpc__) 785 static void * 786 elf_note_powerpc_vmx(void *arg, size_t *sizep) 787 { 788 lwpid_t tid; 789 struct vmxreg *vmx; 790 static bool has_vmx = true; 791 struct vmxreg info; 792 793 tid = *(lwpid_t *)arg; 794 if (has_vmx) { 795 if (ptrace(PT_GETVRREGS, tid, (void *)&info, 796 sizeof(info)) != 0) 797 has_vmx = false; 798 } 799 if (!has_vmx) { 800 *sizep = 0; 801 return (NULL); 802 } 803 vmx = calloc(1, sizeof(*vmx)); 804 memcpy(vmx, &info, sizeof(*vmx)); 805 *sizep = sizeof(*vmx); 806 return (vmx); 807 } 808 809 static void * 810 elf_note_powerpc_vsx(void *arg, size_t *sizep) 811 { 812 lwpid_t tid; 813 char *vshr_data; 814 static bool has_vsx = true; 815 uint64_t vshr[32]; 816 817 tid = *(lwpid_t *)arg; 818 if (has_vsx) { 819 if (ptrace(PT_GETVSRREGS, tid, (void *)vshr, 820 sizeof(vshr)) != 0) 821 has_vsx = false; 822 } 823 if (!has_vsx) { 824 *sizep = 0; 825 return (NULL); 826 } 827 vshr_data = calloc(1, sizeof(vshr)); 828 memcpy(vshr_data, vshr, sizeof(vshr)); 829 *sizep = sizeof(vshr); 830 return (vshr_data); 831 } 832 #endif 833 834 static void * 835 procstat_sysctl(void *arg, int what, size_t structsz, size_t *sizep) 836 { 837 size_t len; 838 pid_t pid; 839 int name[4], structsize; 840 void *buf, *p; 841 842 pid = *(pid_t *)arg; 843 structsize = structsz; 844 name[0] = CTL_KERN; 845 name[1] = KERN_PROC; 846 name[2] = what; 847 name[3] = pid; 848 len = 0; 849 if (sysctl(name, 4, NULL, &len, NULL, 0) == -1) 850 err(1, "kern.proc.%d.%u", what, pid); 851 buf = calloc(1, sizeof(structsize) + len * 4 / 3); 852 if (buf == NULL) 853 errx(1, "out of memory"); 854 bcopy(&structsize, buf, sizeof(structsize)); 855 p = (char *)buf + sizeof(structsize); 856 if (sysctl(name, 4, p, &len, NULL, 0) == -1) 857 err(1, "kern.proc.%d.%u", what, pid); 858 859 *sizep = sizeof(structsize) + len; 860 return (buf); 861 } 862 863 static void * 864 elf_note_procstat_proc(void *arg, size_t *sizep) 865 { 866 867 return (procstat_sysctl(arg, KERN_PROC_PID | KERN_PROC_INC_THREAD, 868 sizeof(struct kinfo_proc), sizep)); 869 } 870 871 static void * 872 elf_note_procstat_files(void *arg, size_t *sizep) 873 { 874 875 return (procstat_sysctl(arg, KERN_PROC_FILEDESC, 876 sizeof(struct kinfo_file), sizep)); 877 } 878 879 static void * 880 elf_note_procstat_vmmap(void *arg, size_t *sizep) 881 { 882 883 return (procstat_sysctl(arg, KERN_PROC_VMMAP, 884 sizeof(struct kinfo_vmentry), sizep)); 885 } 886 887 static void * 888 elf_note_procstat_groups(void *arg, size_t *sizep) 889 { 890 891 return (procstat_sysctl(arg, KERN_PROC_GROUPS, sizeof(gid_t), sizep)); 892 } 893 894 static void * 895 elf_note_procstat_umask(void *arg, size_t *sizep) 896 { 897 898 return (procstat_sysctl(arg, KERN_PROC_UMASK, sizeof(u_short), sizep)); 899 } 900 901 static void * 902 elf_note_procstat_osrel(void *arg, size_t *sizep) 903 { 904 905 return (procstat_sysctl(arg, KERN_PROC_OSREL, sizeof(int), sizep)); 906 } 907 908 static void * 909 elf_note_procstat_psstrings(void *arg, size_t *sizep) 910 { 911 912 return (procstat_sysctl(arg, KERN_PROC_PS_STRINGS, 913 sizeof(vm_offset_t), sizep)); 914 } 915 916 static void * 917 elf_note_procstat_auxv(void *arg, size_t *sizep) 918 { 919 920 return (procstat_sysctl(arg, KERN_PROC_AUXV, 921 sizeof(Elf_Auxinfo), sizep)); 922 } 923 924 static void * 925 elf_note_procstat_rlimit(void *arg, size_t *sizep) 926 { 927 pid_t pid; 928 size_t len; 929 int i, name[5], structsize; 930 void *buf, *p; 931 932 pid = *(pid_t *)arg; 933 structsize = sizeof(struct rlimit) * RLIM_NLIMITS; 934 buf = calloc(1, sizeof(structsize) + structsize); 935 if (buf == NULL) 936 errx(1, "out of memory"); 937 bcopy(&structsize, buf, sizeof(structsize)); 938 p = (char *)buf + sizeof(structsize); 939 name[0] = CTL_KERN; 940 name[1] = KERN_PROC; 941 name[2] = KERN_PROC_RLIMIT; 942 name[3] = pid; 943 len = sizeof(struct rlimit); 944 for (i = 0; i < RLIM_NLIMITS; i++) { 945 name[4] = i; 946 if (sysctl(name, 5, p, &len, NULL, 0) == -1) 947 err(1, "kern.proc.rlimit.%u", pid); 948 if (len != sizeof(struct rlimit)) 949 errx(1, "kern.proc.rlimit.%u: short read", pid); 950 p += len; 951 } 952 953 *sizep = sizeof(structsize) + structsize; 954 return (buf); 955 } 956 957 struct dumpers __elfN(dump) = { elf_ident, elf_coredump }; 958 TEXT_SET(dumpset, __elfN(dump)); 959