1 /*
2 * Copyright (c) 2000-2021 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
29 *
30 * File: bsd/kern/kern_core.c
31 *
32 * This file contains machine independent code for performing core dumps.
33 *
34 */
35 #if CONFIG_COREDUMP
36
37 #include <mach/vm_param.h>
38 #include <mach/thread_status.h>
39 #include <sys/content_protection.h>
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/signalvar.h>
43 #include <sys/resourcevar.h>
44 #include <sys/namei.h>
45 #include <sys/vnode_internal.h>
46 #include <sys/proc_internal.h>
47 #include <sys/kauth.h>
48 #include <sys/timeb.h>
49 #include <sys/times.h>
50 #include <sys/acct.h>
51 #include <sys/file_internal.h>
52 #include <sys/uio.h>
53 #include <sys/kernel.h>
54 #include <sys/stat.h>
55
56 #include <mach-o/loader.h>
57 #include <mach/vm_region.h>
58 #include <mach/vm_statistics.h>
59
60 #include <IOKit/IOBSD.h>
61
62 #include <vm/vm_kern.h>
63 #include <vm/vm_protos.h> /* last */
64 #include <vm/vm_map.h> /* current_map() */
65 #include <mach/mach_vm.h> /* mach_vm_region_recurse() */
66 #include <mach/task.h> /* task_suspend() */
67 #include <kern/task.h> /* get_task_numacts() */
68
69 #include <security/audit/audit.h>
70
71 #if CONFIG_MACF
72 #include <security/mac_framework.h>
73 #endif /* CONFIG_MACF */
74
75 #define COREDUMP_CUSTOM_LOCATION_ENTITLEMENT "com.apple.private.custom-coredump-location"
76
77 typedef struct {
78 int flavor; /* the number for this flavor */
79 mach_msg_type_number_t count; /* count of ints in this flavor */
80 } mythread_state_flavor_t;
81
82 #if defined (__i386__) || defined (__x86_64__)
83 mythread_state_flavor_t thread_flavor_array[] = {
84 {x86_THREAD_STATE, x86_THREAD_STATE_COUNT},
85 {x86_FLOAT_STATE, x86_FLOAT_STATE_COUNT},
86 {x86_EXCEPTION_STATE, x86_EXCEPTION_STATE_COUNT},
87 };
88 int mynum_flavors = 3;
89 #elif defined (__arm64__)
90 mythread_state_flavor_t thread_flavor_array[] = {
91 {ARM_THREAD_STATE64, ARM_THREAD_STATE64_COUNT},
92 /* ARM64_TODO: VFP */
93 {ARM_EXCEPTION_STATE64, ARM_EXCEPTION_STATE64_COUNT}
94 };
95 int mynum_flavors = 2;
96 #else
97 #error architecture not supported
98 #endif
99
100
101 typedef struct {
102 vm_offset_t header;
103 size_t hoffset;
104 mythread_state_flavor_t *flavors;
105 size_t tstate_size;
106 size_t flavor_count;
107 } tir_t;
108
109 extern int freespace_mb(vnode_t vp);
110
111 /* XXX not in a Mach header anywhere */
112 kern_return_t thread_getstatus(thread_t act, int flavor,
113 thread_state_t tstate, mach_msg_type_number_t *count);
114 void task_act_iterate_wth_args(task_t, void (*)(thread_t, void *), void *);
115
116 #ifdef SECURE_KERNEL
117 __XNU_PRIVATE_EXTERN int do_coredump = 0; /* default: don't dump cores */
118 #else
119 __XNU_PRIVATE_EXTERN int do_coredump = 1; /* default: dump cores */
120 #endif /* SECURE_KERNEL */
121 __XNU_PRIVATE_EXTERN int sugid_coredump = 0; /* default: but not SGUID binaries */
122
123
124 /* cpu_type returns only the most generic indication of the current CPU. */
125 /* in a core we want to know the kind of process. */
126
127 cpu_type_t
process_cpu_type(proc_t core_proc)128 process_cpu_type(proc_t core_proc)
129 {
130 cpu_type_t what_we_think;
131 #if defined (__i386__) || defined (__x86_64__)
132 if (IS_64BIT_PROCESS(core_proc)) {
133 what_we_think = CPU_TYPE_X86_64;
134 } else {
135 what_we_think = CPU_TYPE_I386;
136 }
137 #elif defined(__arm64__)
138 if (IS_64BIT_PROCESS(core_proc)) {
139 what_we_think = CPU_TYPE_ARM64;
140 } else {
141 what_we_think = CPU_TYPE_ARM;
142 }
143 #endif
144
145 return what_we_think;
146 }
147
148 cpu_type_t
process_cpu_subtype(proc_t core_proc)149 process_cpu_subtype(proc_t core_proc)
150 {
151 cpu_type_t what_we_think;
152 #if defined (__i386__) || defined (__x86_64__)
153 if (IS_64BIT_PROCESS(core_proc)) {
154 what_we_think = CPU_SUBTYPE_X86_64_ALL;
155 } else {
156 what_we_think = CPU_SUBTYPE_I386_ALL;
157 }
158 #elif defined(__arm64__)
159 if (IS_64BIT_PROCESS(core_proc)) {
160 what_we_think = CPU_SUBTYPE_ARM64_ALL;
161 } else {
162 what_we_think = CPU_SUBTYPE_ARM_ALL;
163 }
164 #endif
165 return what_we_think;
166 }
167
168 static void
collectth_state(thread_t th_act,void * tirp)169 collectth_state(thread_t th_act, void *tirp)
170 {
171 vm_offset_t header;
172 size_t hoffset, i;
173 mythread_state_flavor_t *flavors;
174 struct thread_command *tc;
175 tir_t *t = (tir_t *)tirp;
176
177 /*
178 * Fill in thread command structure.
179 */
180 header = t->header;
181 hoffset = t->hoffset;
182 flavors = t->flavors;
183
184 tc = (struct thread_command *) (header + hoffset);
185 tc->cmd = LC_THREAD;
186 tc->cmdsize = (uint32_t)(sizeof(struct thread_command)
187 + t->tstate_size);
188 hoffset += sizeof(struct thread_command);
189 /*
190 * Follow with a struct thread_state_flavor and
191 * the appropriate thread state struct for each
192 * thread state flavor.
193 */
194 for (i = 0; i < t->flavor_count; i++) {
195 *(mythread_state_flavor_t *)(header + hoffset) =
196 flavors[i];
197 hoffset += sizeof(mythread_state_flavor_t);
198 thread_getstatus(th_act, flavors[i].flavor,
199 (thread_state_t)(header + hoffset),
200 &flavors[i].count);
201 hoffset += flavors[i].count * sizeof(int);
202 }
203
204 t->hoffset = hoffset;
205 }
206
207 #if DEVELOPMENT || DEBUG
208 #define COREDUMPLOG(fmt, args...) printf("coredump (%s, pid %d): " fmt "\n", core_proc->p_comm, proc_getpid(core_proc), ## args)
209 #else
210 #define COREDUMPLOG(fmt, args...)
211 #endif
212
213 /*
214 * coredump
215 *
216 * Description: Create a core image on the file "core" for the process
217 * indicated
218 *
219 * Parameters: core_proc Process to dump core [*]
220 * reserve_mb If non-zero, leave filesystem with
221 * at least this much free space.
222 * coredump_flags Extra options (ignore rlimit, run fsync)
223 *
224 * Returns: 0 Success
225 * !0 Failure errno
226 *
227 * IMPORTANT: This function can only be called on the current process, due
228 * to assumptions below; see variable declaration section for
229 * details.
230 */
231 #define MAX_TSTATE_FLAVORS 10
232 int
coredump(proc_t core_proc,uint32_t reserve_mb,int coredump_flags)233 coredump(proc_t core_proc, uint32_t reserve_mb, int coredump_flags)
234 {
235 /* Begin assumptions that limit us to only the current process */
236 vfs_context_t ctx = vfs_context_current();
237 vm_map_t map = current_map();
238 task_t task = current_task();
239 /* End assumptions */
240 kauth_cred_t cred = vfs_context_ucred(ctx);
241 int error = 0;
242 struct vnode_attr *vap = NULL;
243 size_t thread_count, segment_count;
244 size_t command_size, header_size, tstate_size;
245 size_t hoffset;
246 off_t foffset;
247 mach_vm_offset_t vmoffset;
248 vm_offset_t header;
249 mach_vm_size_t vmsize;
250 vm_prot_t prot;
251 vm_prot_t maxprot;
252 int error1 = 0;
253 char stack_name[MAXCOMLEN + 6];
254 char *alloced_name = NULL;
255 char *name = NULL;
256 mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS];
257 vm_size_t mapsize;
258 size_t i;
259 uint32_t nesting_depth = 0;
260 kern_return_t kret;
261 struct vm_region_submap_info_64 vbr;
262 mach_msg_type_number_t vbrcount = 0;
263 tir_t tir1;
264 struct vnode * vp;
265 struct mach_header *mh = NULL; /* protected by is_64 */
266 struct mach_header_64 *mh64 = NULL; /* protected by is_64 */
267 int is_64 = 0;
268 size_t mach_header_sz = sizeof(struct mach_header);
269 size_t segment_command_sz = sizeof(struct segment_command);
270 const char *format = NULL;
271 char *custom_location_entitlement = NULL;
272 size_t custom_location_entitlement_len = 0;
273 char *alloced_format = NULL;
274 size_t alloced_format_len = 0;
275 bool include_iokit_memory = task_is_driver(task);
276 bool coredump_attempted = false;
277
278 if (current_proc() != core_proc) {
279 panic("coredump() called against proc that is not current_proc: %p", core_proc);
280 }
281
282 if (do_coredump == 0 || /* Not dumping at all */
283 ((sugid_coredump == 0) && /* Not dumping SUID/SGID binaries */
284 ((kauth_cred_getsvuid(cred) != kauth_cred_getruid(cred)) ||
285 (kauth_cred_getsvgid(cred) != kauth_cred_getrgid(cred))))) {
286 error = EFAULT;
287 goto out2;
288 }
289
290 #if CONFIG_MACF
291 error = mac_proc_check_dump_core(core_proc);
292 if (error != 0) {
293 goto out2;
294 }
295 #endif
296
297 if (IS_64BIT_PROCESS(core_proc)) {
298 is_64 = 1;
299 mach_header_sz = sizeof(struct mach_header_64);
300 segment_command_sz = sizeof(struct segment_command_64);
301 }
302
303 mapsize = get_vmmap_size(map);
304
305 custom_location_entitlement = IOCurrentTaskGetEntitlement(COREDUMP_CUSTOM_LOCATION_ENTITLEMENT);
306 if (custom_location_entitlement != NULL) {
307 custom_location_entitlement_len = strlen(custom_location_entitlement);
308 const char * dirname;
309 if (proc_is_driver(core_proc)) {
310 dirname = defaultdrivercorefiledir;
311 } else {
312 dirname = defaultcorefiledir;
313 }
314 size_t dirname_len = strlen(dirname);
315 size_t printed_len;
316
317 /* new format is dirname + "/" + string from entitlement */
318 alloced_format_len = dirname_len + 1 + custom_location_entitlement_len;
319 alloced_format = kalloc_data(alloced_format_len + 1, Z_ZERO | Z_WAITOK | Z_NOFAIL);
320 printed_len = snprintf(alloced_format, alloced_format_len + 1, "%s/%s", dirname, custom_location_entitlement);
321 assert(printed_len == alloced_format_len);
322
323 format = alloced_format;
324 coredump_flags |= COREDUMP_IGNORE_ULIMIT;
325 } else {
326 if (proc_is_driver(core_proc)) {
327 format = drivercorefilename;
328 } else {
329 format = corefilename;
330 }
331 }
332
333 if (((coredump_flags & COREDUMP_IGNORE_ULIMIT) == 0) &&
334 (mapsize >= proc_limitgetcur(core_proc, RLIMIT_CORE))) {
335 error = EFAULT;
336 goto out2;
337 }
338
339 /* log coredump failures from here */
340 coredump_attempted = true;
341
342 (void) task_suspend_internal(task);
343
344 alloced_name = zalloc_flags(ZV_NAMEI, Z_NOWAIT | Z_ZERO);
345
346 /* create name according to sysctl'able format string */
347 /* if name creation fails, fall back to historical behaviour... */
348 if (alloced_name == NULL ||
349 proc_core_name(format, core_proc->p_comm, kauth_cred_getuid(cred),
350 proc_getpid(core_proc), alloced_name, MAXPATHLEN)) {
351 snprintf(stack_name, sizeof(stack_name),
352 "/cores/core.%d", proc_getpid(core_proc));
353 name = stack_name;
354 } else {
355 name = alloced_name;
356 }
357
358 COREDUMPLOG("writing core to %s", name);
359 if ((error = vnode_open(name, (O_CREAT | FWRITE | O_NOFOLLOW), S_IRUSR, VNODE_LOOKUP_NOFOLLOW, &vp, ctx))) {
360 COREDUMPLOG("failed to open core dump file %s: error %d", name, error);
361 goto out2;
362 }
363
364 vap = kalloc_type(struct vnode_attr, Z_WAITOK | Z_ZERO);
365 VATTR_INIT(vap);
366 VATTR_WANTED(vap, va_nlink);
367 /* Don't dump to non-regular files or files with links. */
368 if (vp->v_type != VREG ||
369 vnode_getattr(vp, vap, ctx) || vap->va_nlink != 1) {
370 COREDUMPLOG("failed to write core to non-regular file");
371 error = EFAULT;
372 goto out;
373 }
374
375 VATTR_INIT(vap); /* better to do it here than waste more stack in vnode_setsize */
376 VATTR_SET(vap, va_data_size, 0);
377 if (core_proc == initproc) {
378 VATTR_SET(vap, va_dataprotect_class, PROTECTION_CLASS_D);
379 }
380 vnode_setattr(vp, vap, ctx);
381 core_proc->p_acflag |= ACORE;
382
383 COREDUMPLOG("map size: %lu", mapsize);
384 if ((reserve_mb > 0) &&
385 ((freespace_mb(vp) - (mapsize >> 20)) < reserve_mb)) {
386 COREDUMPLOG("insufficient free space (free=%d MB, needed=%lu MB, reserve=%d MB)", freespace_mb(vp), (mapsize >> 20), reserve_mb);
387 error = ENOSPC;
388 goto out;
389 }
390
391 /*
392 * If the task is modified while dumping the file
393 * (e.g., changes in threads or VM, the resulting
394 * file will not necessarily be correct.
395 */
396
397 thread_count = get_task_numacts(task);
398 segment_count = get_vmmap_entries(map); /* XXX */
399 tir1.flavor_count = sizeof(thread_flavor_array) / sizeof(mythread_state_flavor_t);
400 bcopy(thread_flavor_array, flavors, sizeof(thread_flavor_array));
401 tstate_size = 0;
402 for (i = 0; i < tir1.flavor_count; i++) {
403 tstate_size += sizeof(mythread_state_flavor_t) +
404 (flavors[i].count * sizeof(int));
405 }
406
407 {
408 size_t lhs;
409 size_t rhs;
410
411 /* lhs = segment_count * segment_command_sz */
412 if (os_mul_overflow(segment_count, segment_command_sz, &lhs)) {
413 COREDUMPLOG("error: segment size overflow: segment_count=%lu, segment_command_sz=%lu", segment_count, segment_command_sz);
414 error = ENOMEM;
415 goto out;
416 }
417
418 /* rhs = (tstate_size + sizeof(struct thread_command)) * thread_count */
419 if (os_add_and_mul_overflow(tstate_size, sizeof(struct thread_command), thread_count, &rhs)) {
420 COREDUMPLOG("error: thread state size overflow: tstate_size=%lu, thread_count=%lu", tstate_size, thread_count);
421 error = ENOMEM;
422 goto out;
423 }
424
425 /* command_size = lhs + rhs */
426 if (os_add_overflow(lhs, rhs, &command_size)) {
427 COREDUMPLOG("error: command size overflow: lhs=%lu, rhs=%lu", lhs, rhs);
428 error = ENOMEM;
429 goto out;
430 }
431 }
432
433 if (os_add_overflow(command_size, mach_header_sz, &header_size)) {
434 COREDUMPLOG("error: header size overflow: command_size=%lu, mach_header_sz=%lu", command_size, mach_header_sz);
435 error = ENOMEM;
436 goto out;
437 }
438
439 if (kmem_alloc(kernel_map, &header, (vm_size_t)header_size,
440 KMA_DATA | KMA_ZERO, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
441 COREDUMPLOG("error: failed to allocate memory for header (size=%lu)", header_size);
442 error = ENOMEM;
443 goto out;
444 }
445
446 /*
447 * Set up Mach-O header.
448 */
449 if (is_64) {
450 mh64 = (struct mach_header_64 *)header;
451 mh64->magic = MH_MAGIC_64;
452 mh64->cputype = process_cpu_type(core_proc);
453 mh64->cpusubtype = process_cpu_subtype(core_proc);
454 mh64->filetype = MH_CORE;
455 mh64->ncmds = (uint32_t)(segment_count + thread_count);
456 mh64->sizeofcmds = (uint32_t)command_size;
457 } else {
458 mh = (struct mach_header *)header;
459 mh->magic = MH_MAGIC;
460 mh->cputype = process_cpu_type(core_proc);
461 mh->cpusubtype = process_cpu_subtype(core_proc);
462 mh->filetype = MH_CORE;
463 mh->ncmds = (uint32_t)(segment_count + thread_count);
464 mh->sizeofcmds = (uint32_t)command_size;
465 }
466
467 hoffset = mach_header_sz; /* offset into header */
468 foffset = round_page(header_size); /* offset into file */
469 vmoffset = MACH_VM_MIN_ADDRESS; /* offset into VM */
470 COREDUMPLOG("mach header size: %zu", header_size);
471
472 /*
473 * We use to check for an error, here, now we try and get
474 * as much as we can
475 */
476 COREDUMPLOG("dumping %zu segments", segment_count);
477 while (segment_count > 0) {
478 struct segment_command *sc;
479 struct segment_command_64 *sc64;
480
481 /*
482 * Get region information for next region.
483 */
484
485 while (1) {
486 vbrcount = VM_REGION_SUBMAP_INFO_COUNT_64;
487 if ((kret = mach_vm_region_recurse(map,
488 &vmoffset, &vmsize, &nesting_depth,
489 (vm_region_recurse_info_t)&vbr,
490 &vbrcount)) != KERN_SUCCESS) {
491 break;
492 }
493 /*
494 * If we get a valid mapping back, but we're dumping
495 * a 32 bit process, and it's over the allowable
496 * address space of a 32 bit process, it's the same
497 * as if mach_vm_region_recurse() failed.
498 */
499 if (!(is_64) &&
500 (vmoffset + vmsize > VM_MAX_ADDRESS)) {
501 kret = KERN_INVALID_ADDRESS;
502 COREDUMPLOG("exceeded allowable region for 32-bit process");
503 break;
504 }
505 if (vbr.is_submap) {
506 nesting_depth++;
507 continue;
508 } else {
509 break;
510 }
511 }
512 if (kret != KERN_SUCCESS) {
513 COREDUMPLOG("ending segment dump, kret=%d", kret);
514 break;
515 }
516
517 prot = vbr.protection;
518 maxprot = vbr.max_protection;
519
520 if ((prot | maxprot) == VM_PROT_NONE) {
521 /*
522 * Elide unreadable (likely reserved) segments
523 */
524 COREDUMPLOG("eliding unreadable segment %llx->%llx", vmoffset, vmoffset + vmsize);
525 vmoffset += vmsize;
526 continue;
527 }
528
529 /*
530 * Try as hard as possible to get read access to the data.
531 */
532 if ((prot & VM_PROT_READ) == 0) {
533 mach_vm_protect(map, vmoffset, vmsize, FALSE,
534 prot | VM_PROT_READ);
535 }
536
537 /*
538 * But only try and perform the write if we can read it.
539 */
540 int64_t fsize = ((maxprot & VM_PROT_READ) == VM_PROT_READ
541 && (include_iokit_memory || vbr.user_tag != VM_MEMORY_IOKIT)
542 && coredumpok(map, vmoffset)) ? vmsize : 0;
543
544 if (fsize) {
545 int64_t resid = 0;
546 const enum uio_seg sflg = IS_64BIT_PROCESS(core_proc) ?
547 UIO_USERSPACE64 : UIO_USERSPACE32;
548
549 error = vn_rdwr_64(UIO_WRITE, vp, vmoffset, fsize,
550 foffset, sflg, IO_NODELOCKED | IO_UNIT,
551 cred, &resid, core_proc);
552
553 if (error) {
554 /*
555 * Mark segment as empty
556 */
557 fsize = 0;
558 COREDUMPLOG("failed to write segment %llx->%llx: error %d", vmoffset, vmoffset + vmsize, error);
559 } else if (resid) {
560 /*
561 * Partial write. Extend the file size so
562 * that the segment command contains a valid
563 * range of offsets, possibly creating a hole.
564 */
565 VATTR_INIT(vap);
566 VATTR_SET(vap, va_data_size, foffset + fsize);
567 vnode_setattr(vp, vap, ctx);
568 COREDUMPLOG("partially wrote segment %llx->%llx, resid %lld", vmoffset, vmoffset + vmsize, resid);
569 }
570 } else {
571 COREDUMPLOG("skipping unreadable segment %llx->%llx", vmoffset, vmoffset + vmsize);
572 }
573
574 /*
575 * Fill in segment command structure.
576 */
577
578 if (is_64) {
579 sc64 = (struct segment_command_64 *)(header + hoffset);
580 sc64->cmd = LC_SEGMENT_64;
581 sc64->cmdsize = sizeof(struct segment_command_64);
582 /* segment name is zeroed by kmem_alloc */
583 sc64->segname[0] = 0;
584 sc64->vmaddr = vmoffset;
585 sc64->vmsize = vmsize;
586 sc64->fileoff = foffset;
587 sc64->filesize = fsize;
588 sc64->maxprot = maxprot;
589 sc64->initprot = prot;
590 sc64->nsects = 0;
591 sc64->flags = 0;
592 } else {
593 sc = (struct segment_command *) (header + hoffset);
594 sc->cmd = LC_SEGMENT;
595 sc->cmdsize = sizeof(struct segment_command);
596 /* segment name is zeroed by kmem_alloc */
597 sc->segname[0] = 0;
598 sc->vmaddr = CAST_DOWN_EXPLICIT(uint32_t, vmoffset);
599 sc->vmsize = CAST_DOWN_EXPLICIT(uint32_t, vmsize);
600 sc->fileoff = CAST_DOWN_EXPLICIT(uint32_t, foffset); /* will never truncate */
601 sc->filesize = CAST_DOWN_EXPLICIT(uint32_t, fsize); /* will never truncate */
602 sc->maxprot = maxprot;
603 sc->initprot = prot;
604 sc->nsects = 0;
605 sc->flags = 0;
606 }
607
608 hoffset += segment_command_sz;
609 foffset += fsize;
610 vmoffset += vmsize;
611 segment_count--;
612 }
613 COREDUMPLOG("max file offset: %lld", foffset);
614
615 /*
616 * If there are remaining segments which have not been written
617 * out because break in the loop above, then they were not counted
618 * because they exceed the real address space of the executable
619 * type: remove them from the header's count. This is OK, since
620 * we are allowed to have a sparse area following the segments.
621 */
622 if (is_64) {
623 mh64->ncmds -= segment_count;
624 mh64->sizeofcmds -= segment_count * segment_command_sz;
625 } else {
626 mh->ncmds -= segment_count;
627 mh->sizeofcmds -= segment_count * segment_command_sz;
628 }
629
630 tir1.header = header;
631 tir1.hoffset = hoffset;
632 tir1.flavors = flavors;
633 tir1.tstate_size = tstate_size;
634 COREDUMPLOG("dumping %zu threads", thread_count);
635 task_act_iterate_wth_args(task, collectth_state, &tir1);
636
637 /*
638 * Write out the Mach header at the beginning of the
639 * file. OK to use a 32 bit write for this.
640 */
641 error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, (int)MIN(header_size, INT_MAX), (off_t)0,
642 UIO_SYSSPACE, IO_NODELOCKED | IO_UNIT, cred, (int *) 0, core_proc);
643 if (error != KERN_SUCCESS) {
644 COREDUMPLOG("failed to write mach header: error %d", error);
645 }
646 kmem_free(kernel_map, header, header_size);
647
648 if ((coredump_flags & COREDUMP_FULLFSYNC) && error == 0) {
649 error = VNOP_IOCTL(vp, F_FULLFSYNC, (caddr_t)NULL, 0, ctx);
650 if (error != KERN_SUCCESS) {
651 COREDUMPLOG("failed to FULLFSYNC core: error %d", error);
652 }
653 }
654 out:
655 if (vap) {
656 kfree_type(struct vnode_attr, vap);
657 }
658 error1 = vnode_close(vp, FWRITE, ctx);
659 if (error1 != KERN_SUCCESS) {
660 COREDUMPLOG("failed to close core file: error %d", error1);
661 }
662 out2:
663 #if CONFIG_AUDIT
664 audit_proc_coredump(core_proc, name, error);
665 #endif
666 if (alloced_name != NULL) {
667 zfree(ZV_NAMEI, alloced_name);
668 }
669 if (alloced_format != NULL) {
670 kfree_data(alloced_format, alloced_format_len + 1);
671 }
672 if (custom_location_entitlement != NULL) {
673 kfree_data(custom_location_entitlement, custom_location_entitlement_len + 1);
674 }
675 if (error == 0) {
676 error = error1;
677 }
678
679 if (coredump_attempted) {
680 if (error != 0) {
681 COREDUMPLOG("core dump failed: error %d\n", error);
682 } else {
683 COREDUMPLOG("core dump succeeded");
684 }
685 }
686
687 return error;
688 }
689
690 #else /* CONFIG_COREDUMP */
691
692 /* When core dumps aren't needed, no need to compile this file at all */
693
694 #error assertion failed: this section is not compiled
695
696 #endif /* CONFIG_COREDUMP */
697