39#include "opt_ktrace.h"
42#include <sys/capsicum.h>
45#include <sys/kernel.h>
46#include <sys/kthread.h>
49#include <sys/malloc.h>
54#include <sys/resourcevar.h>
55#include <sys/unistd.h>
57#include <sys/socket.h>
59#include <sys/ktrace.h>
61#include <sys/sysctl.h>
62#include <sys/sysent.h>
63#include <sys/syslog.h>
64#include <sys/sysproto.h>
66#include <security/mac/mac_framework.h>
91FEATURE(ktrace,
"Kernel support for system-call tracing");
93#ifndef KTRACE_REQUEST_POOL
94#define KTRACE_REQUEST_POOL 100
98 struct ktr_header ktr_header;
101 struct ktr_proc_ctor ktr_proc_ctor;
102 struct ktr_cap_fail ktr_cap_fail;
103 struct ktr_syscall ktr_syscall;
104 struct ktr_sysret ktr_sysret;
105 struct ktr_genio ktr_genio;
106 struct ktr_psig ktr_psig;
107 struct ktr_csw ktr_csw;
108 struct ktr_fault ktr_fault;
109 struct ktr_faultend ktr_faultend;
110 struct ktr_struct_array ktr_struct_array;
112 STAILQ_ENTRY(ktr_request) ktr_list;
115static int data_lengths[] = {
116 [KTR_SYSCALL] = offsetof(
struct ktr_syscall, ktr_args),
117 [KTR_SYSRET] =
sizeof(
struct ktr_sysret),
119 [KTR_GENIO] =
sizeof(
struct ktr_genio),
120 [KTR_PSIG] =
sizeof(
struct ktr_psig),
121 [KTR_CSW] =
sizeof(
struct ktr_csw),
125 [KTR_PROCCTOR] =
sizeof(
struct ktr_proc_ctor),
127 [KTR_CAPFAIL] =
sizeof(
struct ktr_cap_fail),
128 [KTR_FAULT] =
sizeof(
struct ktr_fault),
129 [KTR_FAULTEND] =
sizeof(
struct ktr_faultend),
130 [KTR_STRUCT_ARRAY] =
sizeof(
struct ktr_struct_array),
135static SYSCTL_NODE(_kern, OID_AUTO, ktrace, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
138static u_int ktr_requestpool = KTRACE_REQUEST_POOL;
139TUNABLE_INT(
"kern.ktrace.request_pool", &ktr_requestpool);
141u_int ktr_geniosize = PAGE_SIZE;
142SYSCTL_UINT(_kern_ktrace, OID_AUTO, genio_size, CTLFLAG_RWTUN, &ktr_geniosize,
143 0,
"Maximum size of genio event payload");
150int ktr_filesize_limit_signal = 0;
151SYSCTL_INT(_kern_ktrace, OID_AUTO, filesize_limit_signal, CTLFLAG_RWTUN,
152 &ktr_filesize_limit_signal, 0,
153 "Send SIGXFSZ to the traced process when the log size limit is exceeded");
155static int print_message = 1;
156static struct mtx ktrace_mtx;
157static struct sx ktrace_sx;
159struct ktr_io_params {
166static void ktrace_init(
void *
dummy);
167static int sysctl_kern_ktrace_request_pool(SYSCTL_HANDLER_ARGS);
168static u_int ktrace_resize_pool(u_int oldsize, u_int newsize);
169static struct ktr_request *ktr_getrequest_entered(
struct thread *td,
int type);
170static struct ktr_request *ktr_getrequest(
int type);
171static void ktr_submitrequest(
struct thread *td,
struct ktr_request *req);
172static struct ktr_io_params *ktr_freeproc(
struct proc *p);
173static void ktr_freerequest(
struct ktr_request *req);
174static void ktr_freerequest_locked(
struct ktr_request *req);
175static void ktr_writerequest(
struct thread *td,
struct ktr_request *req);
176static int ktrcanset(
struct thread *,
struct proc *);
177static int ktrsetchildren(
struct thread *,
struct proc *,
int,
int,
178 struct ktr_io_params *);
179static int ktrops(
struct thread *,
struct proc *,
int,
int,
180 struct ktr_io_params *);
181static void ktrprocctor_entered(
struct thread *,
struct proc *);
190ktrace_enter(
struct thread *td)
193 KASSERT(!(td->td_pflags & TDP_INKTRACE), (
"ktrace_enter: flag set"));
194 td->td_pflags |= TDP_INKTRACE;
198ktrace_exit(
struct thread *td)
201 KASSERT(td->td_pflags & TDP_INKTRACE, (
"ktrace_exit: flag not set"));
202 td->td_pflags &= ~TDP_INKTRACE;
206ktrace_assert(
struct thread *td)
209 KASSERT(td->td_pflags & TDP_INKTRACE, (
"ktrace_assert: flag not set"));
213ktrace_init(
void *
dummy)
215 struct ktr_request *req;
218 mtx_init(&ktrace_mtx,
"ktrace", NULL, MTX_DEF | MTX_QUIET);
219 sx_init(&ktrace_sx,
"ktrace_sx");
220 STAILQ_INIT(&ktr_free);
221 for (i = 0; i < ktr_requestpool; i++) {
222 req =
malloc(
sizeof(
struct ktr_request), M_KTRACE, M_WAITOK |
224 STAILQ_INSERT_HEAD(&ktr_free, req, ktr_list);
227SYSINIT(ktrace_init, SI_SUB_KTRACE, SI_ORDER_ANY, ktrace_init, NULL);
230sysctl_kern_ktrace_request_pool(SYSCTL_HANDLER_ARGS)
233 u_int newsize, oldsize, wantsize;
238 oldsize = ktr_requestpool;
239 return (SYSCTL_OUT(req, &oldsize,
sizeof(u_int)));
242 error = SYSCTL_IN(req, &wantsize,
sizeof(u_int));
247 oldsize = ktr_requestpool;
248 newsize = ktrace_resize_pool(oldsize, wantsize);
250 error = SYSCTL_OUT(req, &oldsize,
sizeof(u_int));
253 if (wantsize > oldsize && newsize < wantsize)
258 CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, &ktr_requestpool, 0,
259 sysctl_kern_ktrace_request_pool,
"IU",
260 "Pool buffer size for ktrace(1)");
263ktrace_resize_pool(u_int oldsize, u_int newsize)
266 struct ktr_request *req;
270 bound = newsize - oldsize;
272 return (ktr_requestpool);
274 mtx_lock(&ktrace_mtx);
276 while (bound++ < 0) {
277 req = STAILQ_FIRST(&ktr_free);
280 STAILQ_REMOVE_HEAD(&ktr_free, ktr_list);
286 STAILQ_INIT(&ktr_new);
287 while (bound-- > 0) {
288 req =
malloc(
sizeof(
struct ktr_request), M_KTRACE,
290 STAILQ_INSERT_HEAD(&ktr_new, req, ktr_list);
292 mtx_lock(&ktrace_mtx);
293 STAILQ_CONCAT(&ktr_free, &ktr_new);
294 ktr_requestpool += (newsize - oldsize);
296 mtx_unlock(&ktrace_mtx);
297 return (ktr_requestpool);
301CTASSERT(
sizeof(((
struct ktr_header *)NULL)->ktr_comm) ==
302 (
sizeof((
struct thread *)NULL)->td_name));
304static struct ktr_request *
305ktr_getrequest_entered(
struct thread *td,
int type)
307 struct ktr_request *req;
308 struct proc *p = td->td_proc;
311 mtx_lock(&ktrace_mtx);
312 if (!KTRCHECK(td,
type)) {
313 mtx_unlock(&ktrace_mtx);
316 req = STAILQ_FIRST(&ktr_free);
318 STAILQ_REMOVE_HEAD(&ktr_free, ktr_list);
319 req->ktr_header.ktr_type =
type;
320 if (p->p_traceflag & KTRFAC_DROP) {
321 req->ktr_header.ktr_type |= KTR_DROP;
322 p->p_traceflag &= ~KTRFAC_DROP;
324 mtx_unlock(&ktrace_mtx);
326 req->ktr_header.ktr_pid = p->p_pid;
327 req->ktr_header.ktr_tid = td->td_tid;
328 bcopy(td->td_name, req->ktr_header.ktr_comm,
329 sizeof(req->ktr_header.ktr_comm));
330 req->ktr_buffer = NULL;
331 req->ktr_header.ktr_len = 0;
333 p->p_traceflag |= KTRFAC_DROP;
336 mtx_unlock(&ktrace_mtx);
338 printf(
"Out of ktrace request objects.\n");
343static struct ktr_request *
344ktr_getrequest(
int type)
346 struct thread *td = curthread;
347 struct ktr_request *req;
350 req = ktr_getrequest_entered(td,
type);
364ktr_enqueuerequest(
struct thread *td,
struct ktr_request *req)
367 mtx_lock(&ktrace_mtx);
368 STAILQ_INSERT_TAIL(&td->td_proc->p_ktr, req, ktr_list);
369 mtx_unlock(&ktrace_mtx);
371 td->td_flags |= TDF_ASTPENDING;
383ktr_drain(
struct thread *td)
385 struct ktr_request *queued_req;
389 sx_assert(&ktrace_sx, SX_XLOCKED);
391 STAILQ_INIT(&local_queue);
393 if (!STAILQ_EMPTY(&td->td_proc->p_ktr)) {
394 mtx_lock(&ktrace_mtx);
395 STAILQ_CONCAT(&local_queue, &td->td_proc->p_ktr);
396 mtx_unlock(&ktrace_mtx);
398 while ((queued_req = STAILQ_FIRST(&local_queue))) {
399 STAILQ_REMOVE_HEAD(&local_queue, ktr_list);
400 ktr_writerequest(td, queued_req);
401 ktr_freerequest(queued_req);
412ktr_submitrequest(
struct thread *td,
struct ktr_request *req)
417 sx_xlock(&ktrace_sx);
419 ktr_writerequest(td, req);
420 ktr_freerequest(req);
421 sx_xunlock(&ktrace_sx);
426ktr_freerequest(
struct ktr_request *req)
429 mtx_lock(&ktrace_mtx);
430 ktr_freerequest_locked(req);
431 mtx_unlock(&ktrace_mtx);
435ktr_freerequest_locked(
struct ktr_request *req)
438 mtx_assert(&ktrace_mtx, MA_OWNED);
439 if (req->ktr_buffer != NULL)
440 free(req->ktr_buffer, M_KTRACE);
441 STAILQ_INSERT_HEAD(&ktr_free, req, ktr_list);
445ktr_io_params_ref(
struct ktr_io_params *kiop)
447 mtx_assert(&ktrace_mtx, MA_OWNED);
451static struct ktr_io_params *
452ktr_io_params_rele(
struct ktr_io_params *kiop)
454 mtx_assert(&ktrace_mtx, MA_OWNED);
457 KASSERT(kiop->refs > 0, (
"kiop ref == 0 %p", kiop));
458 return (--(kiop->refs) == 0 ? kiop : NULL);
462ktr_io_params_free(
struct ktr_io_params *kiop)
467 MPASS(kiop->refs == 0);
468 vn_close(kiop->vp, FWRITE, kiop->cr, curthread);
470 free(kiop, M_KTRACE);
473static struct ktr_io_params *
474ktr_io_params_alloc(
struct thread *td,
struct vnode *vp)
476 struct ktr_io_params *
res;
478 res =
malloc(
sizeof(
struct ktr_io_params), M_KTRACE, M_WAITOK);
491static struct ktr_io_params *
492ktr_freeproc(
struct proc *p)
494 struct ktr_io_params *kiop;
495 struct ktr_request *req;
497 PROC_LOCK_ASSERT(p, MA_OWNED);
498 mtx_assert(&ktrace_mtx, MA_OWNED);
499 kiop = ktr_io_params_rele(p->p_ktrioparms);
500 p->p_ktrioparms = NULL;
502 while ((req = STAILQ_FIRST(&p->p_ktr)) != NULL) {
503 STAILQ_REMOVE_HEAD(&p->p_ktr, ktr_list);
504 ktr_freerequest_locked(req);
510ktr_get_tracevp(
struct proc *p,
bool ref)
514 PROC_LOCK_ASSERT(p, MA_OWNED);
516 if (p->p_ktrioparms != NULL) {
517 vp = p->p_ktrioparms->vp;
527ktrsyscall(
int code,
int narg, register_t args[])
529 struct ktr_request *req;
530 struct ktr_syscall *ktp;
534 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
537 buflen =
sizeof(register_t) * narg;
539 buf =
malloc(buflen, M_KTRACE, M_WAITOK);
540 bcopy(args,
buf, buflen);
542 req = ktr_getrequest(KTR_SYSCALL);
548 ktp = &req->ktr_data.ktr_syscall;
549 ktp->ktr_code = code;
550 ktp->ktr_narg = narg;
552 req->ktr_header.ktr_len = buflen;
553 req->ktr_buffer =
buf;
555 ktr_submitrequest(curthread, req);
559ktrsysret(
int code,
int error, register_t retval)
561 struct ktr_request *req;
562 struct ktr_sysret *ktp;
564 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
567 req = ktr_getrequest(KTR_SYSRET);
570 ktp = &req->ktr_data.ktr_sysret;
571 ktp->ktr_code = code;
572 ktp->ktr_error = error;
573 ktp->ktr_retval = ((error == 0) ? retval: 0);
574 ktr_submitrequest(curthread, req);
582struct ktr_io_params *
583ktrprocexec(
struct proc *p)
585 struct ktr_io_params *kiop;
587 PROC_LOCK_ASSERT(p, MA_OWNED);
589 kiop = p->p_ktrioparms;
593 mtx_lock(&ktrace_mtx);
594 kiop = ktr_freeproc(p);
595 mtx_unlock(&ktrace_mtx);
604ktrprocexit(
struct thread *td)
606 struct ktr_request *req;
608 struct ktr_io_params *kiop;
611 if (p->p_traceflag == 0)
615 req = ktr_getrequest_entered(td, KTR_PROCDTOR);
617 ktr_enqueuerequest(td, req);
618 sx_xlock(&ktrace_sx);
620 sx_xunlock(&ktrace_sx);
622 mtx_lock(&ktrace_mtx);
623 kiop = ktr_freeproc(p);
624 mtx_unlock(&ktrace_mtx);
626 ktr_io_params_free(kiop);
631ktrprocctor_entered(
struct thread *td,
struct proc *p)
633 struct ktr_proc_ctor *ktp;
634 struct ktr_request *req;
638 td2 = FIRST_THREAD_IN_PROC(p);
639 req = ktr_getrequest_entered(td2, KTR_PROCCTOR);
642 ktp = &req->ktr_data.ktr_proc_ctor;
643 ktp->sv_flags = p->p_sysent->sv_flags;
644 ktr_enqueuerequest(td2, req);
648ktrprocctor(
struct proc *p)
650 struct thread *td = curthread;
652 if ((p->p_traceflag & KTRFAC_MASK) == 0)
656 ktrprocctor_entered(td, p);
664ktrprocfork(
struct proc *p1,
struct proc *p2)
667 MPASS(p2->p_ktrioparms == NULL);
668 MPASS(p2->p_traceflag == 0);
670 if (p1->p_traceflag == 0)
674 mtx_lock(&ktrace_mtx);
675 if (p1->p_traceflag & KTRFAC_INHERIT) {
676 p2->p_traceflag = p1->p_traceflag;
677 if ((p2->p_ktrioparms = p1->p_ktrioparms) != NULL)
678 p1->p_ktrioparms->refs++;
680 mtx_unlock(&ktrace_mtx);
691ktruserret(
struct thread *td)
695 sx_xlock(&ktrace_sx);
697 sx_xunlock(&ktrace_sx);
702ktrnamei(
const char *
path)
704 struct ktr_request *req;
708 namelen = strlen(
path);
710 buf =
malloc(namelen, M_KTRACE, M_WAITOK);
713 req = ktr_getrequest(KTR_NAMEI);
720 req->ktr_header.ktr_len = namelen;
721 req->ktr_buffer =
buf;
723 ktr_submitrequest(curthread, req);
727ktrsysctl(
int *
name, u_int namelen)
729 struct ktr_request *req;
730 u_int mib[CTL_MAXNAME + 2];
736 KASSERT(namelen <= CTL_MAXNAME, (
"sysctl MIB too long"));
739 bcopy(
name, mib + 2, namelen *
sizeof(*
name));
741 mibname =
malloc(mibnamelen, M_KTRACE, M_WAITOK);
742 error =
kernel_sysctl(curthread, mib, namelen + 2, mibname, &mibnamelen,
743 NULL, 0, &mibnamelen, 0);
745 free(mibname, M_KTRACE);
748 req = ktr_getrequest(KTR_SYSCTL);
750 free(mibname, M_KTRACE);
753 req->ktr_header.ktr_len = mibnamelen;
754 req->ktr_buffer = mibname;
755 ktr_submitrequest(curthread, req);
759ktrgenio(
int fd,
enum uio_rw rw,
struct uio *uio,
int error)
761 struct ktr_request *req;
762 struct ktr_genio *ktg;
771 uio->uio_rw = UIO_WRITE;
772 datalen = MIN(uio->uio_resid, ktr_geniosize);
773 buf =
malloc(datalen, M_KTRACE, M_WAITOK);
780 req = ktr_getrequest(KTR_GENIO);
785 ktg = &req->ktr_data.ktr_genio;
788 req->ktr_header.ktr_len = datalen;
789 req->ktr_buffer =
buf;
790 ktr_submitrequest(curthread, req);
794ktrpsig(
int sig, sig_t action, sigset_t *
mask,
int code)
796 struct thread *td = curthread;
797 struct ktr_request *req;
800 req = ktr_getrequest(KTR_PSIG);
803 kp = &req->ktr_data.ktr_psig;
804 kp->signo = (char)sig;
808 ktr_enqueuerequest(td, req);
813ktrcsw(
int out,
int user,
const char *wmesg)
815 struct thread *td = curthread;
816 struct ktr_request *req;
819 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
822 req = ktr_getrequest(KTR_CSW);
825 kc = &req->ktr_data.ktr_csw;
829 strlcpy(kc->wmesg, wmesg,
sizeof(kc->wmesg));
831 bzero(kc->wmesg,
sizeof(kc->wmesg));
832 ktr_enqueuerequest(td, req);
837ktrstruct(
const char *
name,
const void *
data,
size_t datalen)
839 struct ktr_request *req;
841 size_t buflen, namelen;
843 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
848 namelen = strlen(
name) + 1;
849 buflen = namelen + datalen;
850 buf =
malloc(buflen, M_KTRACE, M_WAITOK);
852 bcopy(
data,
buf + namelen, datalen);
853 if ((req = ktr_getrequest(KTR_STRUCT)) == NULL) {
857 req->ktr_buffer =
buf;
858 req->ktr_header.ktr_len = buflen;
859 ktr_submitrequest(curthread, req);
863ktrstruct_error(
const char *
name,
const void *
data,
size_t datalen,
int error)
871ktrstructarray(
const char *
name,
enum uio_seg seg,
const void *
data,
872 int num_items,
size_t struct_size)
874 struct ktr_request *req;
875 struct ktr_struct_array *ksa;
877 size_t buflen, datalen, namelen;
880 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
886 max_items = ktr_geniosize / struct_size;
887 if (num_items > max_items) {
891 num_items = max_items;
893 datalen = num_items * struct_size;
898 namelen = strlen(
name) + 1;
899 buflen = namelen + datalen;
900 buf =
malloc(buflen, M_KTRACE, M_WAITOK);
902 if (seg == UIO_SYSSPACE)
903 bcopy(
data,
buf + namelen, datalen);
905 if (copyin(
data,
buf + namelen, datalen) != 0) {
910 if ((req = ktr_getrequest(KTR_STRUCT_ARRAY)) == NULL) {
914 ksa = &req->ktr_data.ktr_struct_array;
915 ksa->struct_size = struct_size;
916 req->ktr_buffer =
buf;
917 req->ktr_header.ktr_len = buflen;
918 ktr_submitrequest(curthread, req);
922ktrcapfail(
enum ktr_cap_fail_type
type,
const cap_rights_t *needed,
923 const cap_rights_t *held)
925 struct thread *td = curthread;
926 struct ktr_request *req;
927 struct ktr_cap_fail *kcf;
929 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
932 req = ktr_getrequest(KTR_CAPFAIL);
935 kcf = &req->ktr_data.ktr_cap_fail;
936 kcf->cap_type =
type;
938 kcf->cap_needed = *needed;
940 cap_rights_init(&kcf->cap_needed);
942 kcf->cap_held = *held;
944 cap_rights_init(&kcf->cap_held);
945 ktr_enqueuerequest(td, req);
950ktrfault(vm_offset_t vaddr,
int type)
952 struct thread *td = curthread;
953 struct ktr_request *req;
954 struct ktr_fault *kf;
956 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
959 req = ktr_getrequest(KTR_FAULT);
962 kf = &req->ktr_data.ktr_fault;
965 ktr_enqueuerequest(td, req);
972 struct thread *td = curthread;
973 struct ktr_request *req;
974 struct ktr_faultend *kf;
976 if (__predict_false(curthread->td_pflags & TDP_INKTRACE))
979 req = ktr_getrequest(KTR_FAULTEND);
982 kf = &req->ktr_data.ktr_faultend;
984 ktr_enqueuerequest(td, req);
991#ifndef _SYS_SYSPROTO_H_
1004 struct vnode *vp = NULL;
1007 int facs = uap->
facs & ~KTRFAC_ROOT;
1008 int ops = KTROP(uap->
ops);
1009 int descend = uap->
ops & KTRFLAG_DESCEND;
1011 int flags, error = 0;
1012 struct nameidata nd;
1013 struct ktr_io_params *kiop, *old_kiop;
1018 if (ops != KTROP_CLEARFILE && facs == 0)
1022 if (ops != KTROP_CLEAR) {
1026 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->
fname);
1027 flags = FREAD | FWRITE | O_NOFOLLOW;
1031 NDFREE(&nd, NDF_ONLY_PNBUF);
1034 if (vp->v_type != VREG) {
1035 (void)
vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
1038 kiop = ktr_io_params_alloc(td, vp);
1045 if (ops == KTROP_CLEARFILE) {
1048 FOREACH_PROC_IN_SYSTEM(p) {
1051 if (p->p_ktrioparms != NULL &&
1052 p->p_ktrioparms->vp == vp) {
1053 if (ktrcanset(td, p)) {
1054 mtx_lock(&ktrace_mtx);
1055 old_kiop = ktr_freeproc(p);
1056 mtx_unlock(&ktrace_mtx);
1061 if (old_kiop != NULL) {
1063 ktr_io_params_free(old_kiop);
1090 if (LIST_EMPTY(&pg->pg_members)) {
1095 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
1098 ret |= ktrsetchildren(td, p, ops, facs, kiop);
1100 ret |= ktrops(td, p, ops, facs, kiop);
1113 ret |= ktrsetchildren(td, p, ops, facs, kiop);
1115 ret |= ktrops(td, p, ops, facs, kiop);
1122 mtx_lock(&ktrace_mtx);
1123 kiop = ktr_io_params_rele(kiop);
1124 mtx_unlock(&ktrace_mtx);
1125 ktr_io_params_free(kiop);
1140 struct ktr_request *req;
1144 if (!KTRPOINT(td, KTR_USER))
1146 if (uap->len > KTR_USER_MAXLEN)
1148 cp =
malloc(uap->len, M_KTRACE, M_WAITOK);
1149 error = copyin(uap->addr, cp, uap->len);
1154 req = ktr_getrequest(KTR_USER);
1159 req->ktr_buffer = cp;
1160 req->ktr_header.ktr_len = uap->len;
1161 ktr_submitrequest(td, req);
1170ktrops(
struct thread *td,
struct proc *p,
int ops,
int facs,
1171 struct ktr_io_params *new_kiop)
1173 struct ktr_io_params *old_kiop;
1175 PROC_LOCK_ASSERT(p, MA_OWNED);
1176 if (!ktrcanset(td, p)) {
1180 if ((ops == KTROP_SET && p->p_state == PRS_NEW) ||
1190 if ((p->p_flag & P_WEXIT) != 0) {
1199 mtx_lock(&ktrace_mtx);
1200 if (ops == KTROP_SET) {
1201 if (p->p_ktrioparms != NULL &&
1202 p->p_ktrioparms->vp != new_kiop->vp) {
1204 old_kiop = ktr_io_params_rele(p->p_ktrioparms);
1205 p->p_ktrioparms = NULL;
1207 if (p->p_ktrioparms == NULL) {
1208 p->p_ktrioparms = new_kiop;
1209 ktr_io_params_ref(new_kiop);
1211 p->p_traceflag |= facs;
1213 p->p_traceflag |= KTRFAC_ROOT;
1216 if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0)
1218 old_kiop = ktr_freeproc(p);
1220 mtx_unlock(&ktrace_mtx);
1221 if ((p->p_traceflag & KTRFAC_MASK) != 0)
1222 ktrprocctor_entered(td, p);
1224 ktr_io_params_free(old_kiop);
1230ktrsetchildren(
struct thread *td,
struct proc *top,
int ops,
int facs,
1231 struct ktr_io_params *new_kiop)
1237 PROC_LOCK_ASSERT(p, MA_OWNED);
1240 ret |= ktrops(td, p, ops, facs, new_kiop);
1246 if (!LIST_EMPTY(&p->p_children))
1247 p = LIST_FIRST(&p->p_children);
1251 if (LIST_NEXT(p, p_sibling)) {
1252 p = LIST_NEXT(p, p_sibling);
1263ktr_writerequest(
struct thread *td,
struct ktr_request *req)
1265 struct ktr_io_params *kiop, *kiop1;
1266 struct ktr_header *kth;
1271 struct iovec aiov[3];
1274 int datalen, buflen;
1283 mtx_lock(&ktrace_mtx);
1284 kiop = p->p_ktrioparms;
1291 mtx_unlock(&ktrace_mtx);
1295 ktr_io_params_ref(kiop);
1300 KASSERT(cred != NULL, (
"ktr_writerequest: cred == NULL"));
1301 mtx_unlock(&ktrace_mtx);
1303 kth = &req->ktr_header;
1304 KASSERT(((u_short)kth->ktr_type & ~KTR_DROP) < nitems(data_lengths),
1305 (
"data_lengths array overflow"));
1306 datalen = data_lengths[(u_short)kth->ktr_type & ~KTR_DROP];
1307 buflen = kth->ktr_len;
1308 auio.uio_iov = &aiov[0];
1309 auio.uio_offset = 0;
1310 auio.uio_segflg = UIO_SYSSPACE;
1311 auio.uio_rw = UIO_WRITE;
1312 aiov[0].iov_base = (caddr_t)kth;
1313 aiov[0].iov_len =
sizeof(
struct ktr_header);
1314 auio.uio_resid =
sizeof(
struct ktr_header);
1315 auio.uio_iovcnt = 1;
1318 aiov[1].iov_base = (caddr_t)&req->ktr_data;
1319 aiov[1].iov_len = datalen;
1320 auio.uio_resid += datalen;
1322 kth->ktr_len += datalen;
1325 KASSERT(req->ktr_buffer != NULL, (
"ktrace: nothing to write"));
1326 aiov[auio.uio_iovcnt].iov_base = req->ktr_buffer;
1327 aiov[auio.uio_iovcnt].iov_len = buflen;
1328 auio.uio_resid += buflen;
1333 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1334 td->td_ktr_io_lim = lim;
1336 error = mac_vnode_check_write(cred, NOCRED, vp);
1339 error = VOP_WRITE(vp, &auio, IO_UNIT | IO_APPEND, cred);
1343 mtx_lock(&ktrace_mtx);
1344 kiop = ktr_io_params_rele(kiop);
1345 mtx_unlock(&ktrace_mtx);
1346 ktr_io_params_free(kiop);
1356 "ktrace write failed, errno %d, tracing stopped for pid %d\n",
1361 mtx_lock(&ktrace_mtx);
1362 if (p->p_ktrioparms != NULL && p->p_ktrioparms->vp == vp)
1363 kiop1 = ktr_freeproc(p);
1364 kiop = ktr_io_params_rele(kiop);
1365 mtx_unlock(&ktrace_mtx);
1367 ktr_io_params_free(kiop1);
1368 ktr_io_params_free(kiop);
1379ktrcanset(
struct thread *td,
struct proc *targetp)
1382 PROC_LOCK_ASSERT(targetp, MA_OWNED);
1383 if (targetp->p_traceflag & KTRFAC_ROOT &&
device_property_type_t type
SYSCTL_NODE(_kern, OID_AUTO, binmisc, CTLFLAG_RW|CTLFLAG_MPSAFE, 0, "Image activator for miscellaneous binaries")
SYSCTL_PROC(_kern_binmisc, OID_AUTO, add, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ADD, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Add an activator entry")
SYSINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_init, NULL)
SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN, &__elfN(aslr_enabled), 0, ": enable address map randomization")
CTASSERT(MAXSHELLCMDLEN >=MAXINTERP+3)
TUNABLE_INT("kern.eventtimer.periodic", &want_periodic)
SYSCTL_UINT(_kern_eventtimer, OID_AUTO, idletick, CTLFLAG_RWTUN, &idletick, 0, "Run periodic events when idle")
static STAILQ_HEAD(cn_device)
FEATURE(kdtrace_hooks, "Kernel DTrace hooks which are required to load DTrace kernel modules")
static MALLOC_DEFINE(M_KTRACE, "KTRACE", "KTRACE")
int sys_ktrace(struct thread *td, struct ktrace_args *uap)
int sys_utrace(struct thread *td, struct utrace_args *uap)
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
void free(void *addr, struct malloc_type *mtp)
int priv_check_cred(struct ucred *cred, int priv)
int priv_check(struct thread *td, int priv)
struct sx __exclusive_cache_line proctree_lock
struct proc * pfind(pid_t pid)
struct sx __exclusive_cache_line allproc_lock
struct pgrp * pgfind(pid_t pgid)
int p_cansee(struct thread *td, struct proc *p)
int p_candebug(struct thread *td, struct proc *p)
struct ucred * crhold(struct ucred *cr)
void crfree(struct ucred *cr)
rlim_t() lim_cur(struct thread *td, int which)
int kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags)
void microtime(struct timeval *tvp)
int printf(const char *fmt,...)
void log(int level, const char *fmt,...)
int uiomove(void *cp, int n, struct uio *uio)
void() NDFREE(struct nameidata *ndp, const u_int flags)
void vrefact(struct vnode *vp)
int vn_start_write(struct vnode *vp, struct mount **mpp, int flags)
int vn_open(struct nameidata *ndp, int *flagp, int cmode, struct file *fp)
int vn_close(struct vnode *vp, int flags, struct ucred *file_cred, struct thread *td)
void vn_finished_write(struct mount *mp)