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 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 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 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 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 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 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 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 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 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 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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 * 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