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4d2ede6798
freebsd/sys/kern/kern_proc.c
John Baldwin 8e6fa660f2 Fix some locking nits with the p_state field of struct proc: 
- Hold the proc lock while changing the state from PRS_NEW to PRS_NORMAL
  in fork to honor the locking requirements.  While here, expand the scope
  of the PROC_LOCK() on the new process (p2) to avoid some LORs.  Previously
  the code was locking the new child process (p2) after it had locked the
  parent process (p1).  However, when locking two processes, the safe order
  is to lock the child first, then the parent.
- Fix various places that were checking p_state against PRS_NEW without
  having the process locked to use PROC_LOCK().  Every place was already
  locking the process, just after the PRS_NEW check.
- Remove or reduce the use of PROC_SLOCK() for places that were checking
  p_state against PRS_NEW.  The PROC_LOCK() alone is sufficient for reading
  the current state.
- Reorder fill_kinfo_proc() slightly so it only acquires PROC_SLOCK() once.

MFC after:	1 week
2011-03-24 18:40:11 +00:00

2070 lines
50 KiB
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/*-
* Copyright (c) 1982, 1986, 1989, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include "opt_ddb.h"
#include "opt_kdtrace.h"
#include "opt_ktrace.h"
#include "opt_kstack_pages.h"
#include "opt_stack.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/loginclass.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/refcount.h>
#include <sys/sbuf.h>
#include <sys/sysent.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/stack.h>
#include <sys/sysctl.h>
#include <sys/filedesc.h>
#include <sys/tty.h>
#include <sys/signalvar.h>
#include <sys/sdt.h>
#include <sys/sx.h>
#include <sys/user.h>
#include <sys/jail.h>
#include <sys/vnode.h>
#include <sys/eventhandler.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/uma.h>
#ifdef COMPAT_FREEBSD32
#include <compat/freebsd32/freebsd32.h>
#include <compat/freebsd32/freebsd32_util.h>
#endif
SDT_PROVIDER_DEFINE(proc);
SDT_PROBE_DEFINE(proc, kernel, ctor, entry, entry);
SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 0, "struct proc *");
SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 1, "int");
SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 2, "void *");
SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 3, "int");
SDT_PROBE_DEFINE(proc, kernel, ctor, return, return);
SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 0, "struct proc *");
SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 1, "int");
SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 2, "void *");
SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 3, "int");
SDT_PROBE_DEFINE(proc, kernel, dtor, entry, entry);
SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 0, "struct proc *");
SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 1, "int");
SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 2, "void *");
SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 3, "struct thread *");
SDT_PROBE_DEFINE(proc, kernel, dtor, return, return);
SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 0, "struct proc *");
SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 1, "int");
SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 2, "void *");
SDT_PROBE_DEFINE(proc, kernel, init, entry, entry);
SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 0, "struct proc *");
SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 1, "int");
SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 2, "int");
SDT_PROBE_DEFINE(proc, kernel, init, return, return);
SDT_PROBE_ARGTYPE(proc, kernel, init, return, 0, "struct proc *");
SDT_PROBE_ARGTYPE(proc, kernel, init, return, 1, "int");
SDT_PROBE_ARGTYPE(proc, kernel, init, return, 2, "int");
MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
MALLOC_DEFINE(M_SESSION, "session", "session header");
static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
static void doenterpgrp(struct proc *, struct pgrp *);
static void orphanpg(struct pgrp *pg);
static void fill_kinfo_aggregate(struct proc *p, struct kinfo_proc *kp);
static void fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp);
static void fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp,
int preferthread);
static void pgadjustjobc(struct pgrp *pgrp, int entering);
static void pgdelete(struct pgrp *);
static int proc_ctor(void *mem, int size, void *arg, int flags);
static void proc_dtor(void *mem, int size, void *arg);
static int proc_init(void *mem, int size, int flags);
static void proc_fini(void *mem, int size);
static void pargs_free(struct pargs *pa);
/*
* Other process lists
*/
struct pidhashhead *pidhashtbl;
u_long pidhash;
struct pgrphashhead *pgrphashtbl;
u_long pgrphash;
struct proclist allproc;
struct proclist zombproc;
struct sx allproc_lock;
struct sx proctree_lock;
struct mtx ppeers_lock;
uma_zone_t proc_zone;
int kstack_pages = KSTACK_PAGES;
SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0,
"Kernel stack size in pages");
CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
#ifdef COMPAT_FREEBSD32
CTASSERT(sizeof(struct kinfo_proc32) == KINFO_PROC32_SIZE);
#endif
/*
* Initialize global process hashing structures.
*/
void
procinit()
{
sx_init(&allproc_lock, "allproc");
sx_init(&proctree_lock, "proctree");
mtx_init(&ppeers_lock, "p_peers", NULL, MTX_DEF);
LIST_INIT(&allproc);
LIST_INIT(&zombproc);
pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
proc_zone = uma_zcreate("PROC", sched_sizeof_proc(),
proc_ctor, proc_dtor, proc_init, proc_fini,
UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uihashinit();
}
/*
* Prepare a proc for use.
*/
static int
proc_ctor(void *mem, int size, void *arg, int flags)
{
struct proc *p;
p = (struct proc *)mem;
SDT_PROBE(proc, kernel, ctor , entry, p, size, arg, flags, 0);
EVENTHANDLER_INVOKE(process_ctor, p);
SDT_PROBE(proc, kernel, ctor , return, p, size, arg, flags, 0);
return (0);
}
/*
* Reclaim a proc after use.
*/
static void
proc_dtor(void *mem, int size, void *arg)
{
struct proc *p;
struct thread *td;
/* INVARIANTS checks go here */
p = (struct proc *)mem;
td = FIRST_THREAD_IN_PROC(p);
SDT_PROBE(proc, kernel, dtor, entry, p, size, arg, td, 0);
if (td != NULL) {
#ifdef INVARIANTS
KASSERT((p->p_numthreads == 1),
("bad number of threads in exiting process"));
KASSERT(STAILQ_EMPTY(&p->p_ktr), ("proc_dtor: non-empty p_ktr"));
#endif
/* Free all OSD associated to this thread. */
osd_thread_exit(td);
}
EVENTHANDLER_INVOKE(process_dtor, p);
if (p->p_ksi != NULL)
KASSERT(! KSI_ONQ(p->p_ksi), ("SIGCHLD queue"));
SDT_PROBE(proc, kernel, dtor, return, p, size, arg, 0, 0);
}
/*
* Initialize type-stable parts of a proc (when newly created).
*/
static int
proc_init(void *mem, int size, int flags)
{
struct proc *p;
p = (struct proc *)mem;
SDT_PROBE(proc, kernel, init, entry, p, size, flags, 0, 0);
p->p_sched = (struct p_sched *)&p[1];
bzero(&p->p_mtx, sizeof(struct mtx));
mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
mtx_init(&p->p_slock, "process slock", NULL, MTX_SPIN | MTX_RECURSE);
cv_init(&p->p_pwait, "ppwait");
cv_init(&p->p_dbgwait, "dbgwait");
TAILQ_INIT(&p->p_threads); /* all threads in proc */
EVENTHANDLER_INVOKE(process_init, p);
p->p_stats = pstats_alloc();
SDT_PROBE(proc, kernel, init, return, p, size, flags, 0, 0);
return (0);
}
/*
* UMA should ensure that this function is never called.
* Freeing a proc structure would violate type stability.
*/
static void
proc_fini(void *mem, int size)
{
#ifdef notnow
struct proc *p;
p = (struct proc *)mem;
EVENTHANDLER_INVOKE(process_fini, p);
pstats_free(p->p_stats);
thread_free(FIRST_THREAD_IN_PROC(p));
mtx_destroy(&p->p_mtx);
if (p->p_ksi != NULL)
ksiginfo_free(p->p_ksi);
#else
panic("proc reclaimed");
#endif
}
/*
* Is p an inferior of the current process?
*/
int
inferior(p)
register struct proc *p;
{
sx_assert(&proctree_lock, SX_LOCKED);
for (; p != curproc; p = p->p_pptr)
if (p->p_pid == 0)
return (0);
return (1);
}
/*
* Locate a process by number; return only "live" processes -- i.e., neither
* zombies nor newly born but incompletely initialized processes. By not
* returning processes in the PRS_NEW state, we allow callers to avoid
* testing for that condition to avoid dereferencing p_ucred, et al.
*/
struct proc *
pfind(pid)
register pid_t pid;
{
register struct proc *p;
sx_slock(&allproc_lock);
LIST_FOREACH(p, PIDHASH(pid), p_hash)
if (p->p_pid == pid) {
PROC_LOCK(p);
if (p->p_state == PRS_NEW) {
PROC_UNLOCK(p);
p = NULL;
}
break;
}
sx_sunlock(&allproc_lock);
return (p);
}
/*
* Locate a process group by number.
* The caller must hold proctree_lock.
*/
struct pgrp *
pgfind(pgid)
register pid_t pgid;
{
register struct pgrp *pgrp;
sx_assert(&proctree_lock, SX_LOCKED);
LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
if (pgrp->pg_id == pgid) {
PGRP_LOCK(pgrp);
return (pgrp);
}
}
return (NULL);
}
/*
* Create a new process group.
* pgid must be equal to the pid of p.
* Begin a new session if required.
*/
int
enterpgrp(p, pgid, pgrp, sess)
register struct proc *p;
pid_t pgid;
struct pgrp *pgrp;
struct session *sess;
{
struct pgrp *pgrp2;
sx_assert(&proctree_lock, SX_XLOCKED);
KASSERT(pgrp != NULL, ("enterpgrp: pgrp == NULL"));
KASSERT(p->p_pid == pgid,
("enterpgrp: new pgrp and pid != pgid"));
pgrp2 = pgfind(pgid);
KASSERT(pgrp2 == NULL,
("enterpgrp: pgrp with pgid exists"));
KASSERT(!SESS_LEADER(p),
("enterpgrp: session leader attempted setpgrp"));
mtx_init(&pgrp->pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
if (sess != NULL) {
/*
* new session
*/
mtx_init(&sess->s_mtx, "session", NULL, MTX_DEF);
PROC_LOCK(p);
p->p_flag &= ~P_CONTROLT;
PROC_UNLOCK(p);
PGRP_LOCK(pgrp);
sess->s_leader = p;
sess->s_sid = p->p_pid;
refcount_init(&sess->s_count, 1);
sess->s_ttyvp = NULL;
sess->s_ttydp = NULL;
sess->s_ttyp = NULL;
bcopy(p->p_session->s_login, sess->s_login,
sizeof(sess->s_login));
pgrp->pg_session = sess;
KASSERT(p == curproc,
("enterpgrp: mksession and p != curproc"));
} else {
pgrp->pg_session = p->p_session;
sess_hold(pgrp->pg_session);
PGRP_LOCK(pgrp);
}
pgrp->pg_id = pgid;
LIST_INIT(&pgrp->pg_members);
/*
* As we have an exclusive lock of proctree_lock,
* this should not deadlock.
*/
LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
pgrp->pg_jobc = 0;
SLIST_INIT(&pgrp->pg_sigiolst);
PGRP_UNLOCK(pgrp);
doenterpgrp(p, pgrp);
return (0);
}
/*
* Move p to an existing process group
*/
int
enterthispgrp(p, pgrp)
register struct proc *p;
struct pgrp *pgrp;
{
sx_assert(&proctree_lock, SX_XLOCKED);
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
KASSERT(pgrp->pg_session == p->p_session,
("%s: pgrp's session %p, p->p_session %p.\n",
__func__,
pgrp->pg_session,
p->p_session));
KASSERT(pgrp != p->p_pgrp,
("%s: p belongs to pgrp.", __func__));
doenterpgrp(p, pgrp);
return (0);
}
/*
* Move p to a process group
*/
static void
doenterpgrp(p, pgrp)
struct proc *p;
struct pgrp *pgrp;
{
struct pgrp *savepgrp;
sx_assert(&proctree_lock, SX_XLOCKED);
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
savepgrp = p->p_pgrp;
/*
* Adjust eligibility of affected pgrps to participate in job control.
* Increment eligibility counts before decrementing, otherwise we
* could reach 0 spuriously during the first call.
*/
fixjobc(p, pgrp, 1);
fixjobc(p, p->p_pgrp, 0);
PGRP_LOCK(pgrp);
PGRP_LOCK(savepgrp);
PROC_LOCK(p);
LIST_REMOVE(p, p_pglist);
p->p_pgrp = pgrp;
PROC_UNLOCK(p);
LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
PGRP_UNLOCK(savepgrp);
PGRP_UNLOCK(pgrp);
if (LIST_EMPTY(&savepgrp->pg_members))
pgdelete(savepgrp);
}
/*
* remove process from process group
*/
int
leavepgrp(p)
register struct proc *p;
{
struct pgrp *savepgrp;
sx_assert(&proctree_lock, SX_XLOCKED);
savepgrp = p->p_pgrp;
PGRP_LOCK(savepgrp);
PROC_LOCK(p);
LIST_REMOVE(p, p_pglist);
p->p_pgrp = NULL;
PROC_UNLOCK(p);
PGRP_UNLOCK(savepgrp);
if (LIST_EMPTY(&savepgrp->pg_members))
pgdelete(savepgrp);
return (0);
}
/*
* delete a process group
*/
static void
pgdelete(pgrp)
register struct pgrp *pgrp;
{
struct session *savesess;
struct tty *tp;
sx_assert(&proctree_lock, SX_XLOCKED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
/*
* Reset any sigio structures pointing to us as a result of
* F_SETOWN with our pgid.
*/
funsetownlst(&pgrp->pg_sigiolst);
PGRP_LOCK(pgrp);
tp = pgrp->pg_session->s_ttyp;
LIST_REMOVE(pgrp, pg_hash);
savesess = pgrp->pg_session;
PGRP_UNLOCK(pgrp);
/* Remove the reference to the pgrp before deallocating it. */
if (tp != NULL) {
tty_lock(tp);
tty_rel_pgrp(tp, pgrp);
}
mtx_destroy(&pgrp->pg_mtx);
free(pgrp, M_PGRP);
sess_release(savesess);
}
static void
pgadjustjobc(pgrp, entering)
struct pgrp *pgrp;
int entering;
{
PGRP_LOCK(pgrp);
if (entering)
pgrp->pg_jobc++;
else {
--pgrp->pg_jobc;
if (pgrp->pg_jobc == 0)
orphanpg(pgrp);
}
PGRP_UNLOCK(pgrp);
}
/*
* Adjust pgrp jobc counters when specified process changes process group.
* We count the number of processes in each process group that "qualify"
* the group for terminal job control (those with a parent in a different
* process group of the same session). If that count reaches zero, the
* process group becomes orphaned. Check both the specified process'
* process group and that of its children.
* entering == 0 => p is leaving specified group.
* entering == 1 => p is entering specified group.
*/
void
fixjobc(p, pgrp, entering)
register struct proc *p;
register struct pgrp *pgrp;
int entering;
{
register struct pgrp *hispgrp;
register struct session *mysession;
sx_assert(&proctree_lock, SX_LOCKED);
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
/*
* Check p's parent to see whether p qualifies its own process
* group; if so, adjust count for p's process group.
*/
mysession = pgrp->pg_session;
if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
hispgrp->pg_session == mysession)
pgadjustjobc(pgrp, entering);
/*
* Check this process' children to see whether they qualify
* their process groups; if so, adjust counts for children's
* process groups.
*/
LIST_FOREACH(p, &p->p_children, p_sibling) {
hispgrp = p->p_pgrp;
if (hispgrp == pgrp ||
hispgrp->pg_session != mysession)
continue;
PROC_LOCK(p);
if (p->p_state == PRS_ZOMBIE) {
PROC_UNLOCK(p);
continue;
}
PROC_UNLOCK(p);
pgadjustjobc(hispgrp, entering);
}
}
/*
* A process group has become orphaned;
* if there are any stopped processes in the group,
* hang-up all process in that group.
*/
static void
orphanpg(pg)
struct pgrp *pg;
{
register struct proc *p;
PGRP_LOCK_ASSERT(pg, MA_OWNED);
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
PROC_LOCK(p);
if (P_SHOULDSTOP(p)) {
PROC_UNLOCK(p);
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
PROC_LOCK(p);
psignal(p, SIGHUP);
psignal(p, SIGCONT);
PROC_UNLOCK(p);
}
return;
}
PROC_UNLOCK(p);
}
}
void
sess_hold(struct session *s)
{
refcount_acquire(&s->s_count);
}
void
sess_release(struct session *s)
{
if (refcount_release(&s->s_count)) {
if (s->s_ttyp != NULL) {
tty_lock(s->s_ttyp);
tty_rel_sess(s->s_ttyp, s);
}
mtx_destroy(&s->s_mtx);
free(s, M_SESSION);
}
}
#include "opt_ddb.h"
#ifdef DDB
#include <ddb/ddb.h>
DB_SHOW_COMMAND(pgrpdump, pgrpdump)
{
register struct pgrp *pgrp;
register struct proc *p;
register int i;
for (i = 0; i <= pgrphash; i++) {
if (!LIST_EMPTY(&pgrphashtbl[i])) {
printf("\tindx %d\n", i);
LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
printf(
"\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
(void *)pgrp, (long)pgrp->pg_id,
(void *)pgrp->pg_session,
pgrp->pg_session->s_count,
(void *)LIST_FIRST(&pgrp->pg_members));
LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
printf("\t\tpid %ld addr %p pgrp %p\n",
(long)p->p_pid, (void *)p,
(void *)p->p_pgrp);
}
}
}
}
}
#endif /* DDB */
/*
* Calculate the kinfo_proc members which contain process-wide
* informations.
* Must be called with the target process locked.
*/
static void
fill_kinfo_aggregate(struct proc *p, struct kinfo_proc *kp)
{
struct thread *td;
PROC_LOCK_ASSERT(p, MA_OWNED);
kp->ki_estcpu = 0;
kp->ki_pctcpu = 0;
FOREACH_THREAD_IN_PROC(p, td) {
thread_lock(td);
kp->ki_pctcpu += sched_pctcpu(td);
kp->ki_estcpu += td->td_estcpu;
thread_unlock(td);
}
}
/*
* Clear kinfo_proc and fill in any information that is common
* to all threads in the process.
* Must be called with the target process locked.
*/
static void
fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp)
{
struct thread *td0;
struct tty *tp;
struct session *sp;
struct ucred *cred;
struct sigacts *ps;
PROC_LOCK_ASSERT(p, MA_OWNED);
bzero(kp, sizeof(*kp));
kp->ki_structsize = sizeof(*kp);
kp->ki_paddr = p;
kp->ki_addr =/* p->p_addr; */0; /* XXX */
kp->ki_args = p->p_args;
kp->ki_textvp = p->p_textvp;
#ifdef KTRACE
kp->ki_tracep = p->p_tracevp;
kp->ki_traceflag = p->p_traceflag;
#endif
kp->ki_fd = p->p_fd;
kp->ki_vmspace = p->p_vmspace;
kp->ki_flag = p->p_flag;
cred = p->p_ucred;
if (cred) {
kp->ki_uid = cred->cr_uid;
kp->ki_ruid = cred->cr_ruid;
kp->ki_svuid = cred->cr_svuid;
kp->ki_cr_flags = 0;
if (cred->cr_flags & CRED_FLAG_CAPMODE)
kp->ki_cr_flags |= KI_CRF_CAPABILITY_MODE;
/* XXX bde doesn't like KI_NGROUPS */
if (cred->cr_ngroups > KI_NGROUPS) {
kp->ki_ngroups = KI_NGROUPS;
kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW;
} else
kp->ki_ngroups = cred->cr_ngroups;
bcopy(cred->cr_groups, kp->ki_groups,
kp->ki_ngroups * sizeof(gid_t));
kp->ki_rgid = cred->cr_rgid;
kp->ki_svgid = cred->cr_svgid;
/* If jailed(cred), emulate the old P_JAILED flag. */
if (jailed(cred)) {
kp->ki_flag |= P_JAILED;
/* If inside the jail, use 0 as a jail ID. */
if (cred->cr_prison != curthread->td_ucred->cr_prison)
kp->ki_jid = cred->cr_prison->pr_id;
}
strlcpy(kp->ki_loginclass, cred->cr_loginclass->lc_name,
sizeof(kp->ki_loginclass));
}
ps = p->p_sigacts;
if (ps) {
mtx_lock(&ps->ps_mtx);
kp->ki_sigignore = ps->ps_sigignore;
kp->ki_sigcatch = ps->ps_sigcatch;
mtx_unlock(&ps->ps_mtx);
}
if (p->p_state != PRS_NEW &&
p->p_state != PRS_ZOMBIE &&
p->p_vmspace != NULL) {
struct vmspace *vm = p->p_vmspace;
kp->ki_size = vm->vm_map.size;
kp->ki_rssize = vmspace_resident_count(vm); /*XXX*/
FOREACH_THREAD_IN_PROC(p, td0) {
if (!TD_IS_SWAPPED(td0))
kp->ki_rssize += td0->td_kstack_pages;
}
kp->ki_swrss = vm->vm_swrss;
kp->ki_tsize = vm->vm_tsize;
kp->ki_dsize = vm->vm_dsize;
kp->ki_ssize = vm->vm_ssize;
} else if (p->p_state == PRS_ZOMBIE)
kp->ki_stat = SZOMB;
if (kp->ki_flag & P_INMEM)
kp->ki_sflag = PS_INMEM;
else
kp->ki_sflag = 0;
/* Calculate legacy swtime as seconds since 'swtick'. */
kp->ki_swtime = (ticks - p->p_swtick) / hz;
kp->ki_pid = p->p_pid;
kp->ki_nice = p->p_nice;
kp->ki_start = p->p_stats->p_start;
timevaladd(&kp->ki_start, &boottime);
PROC_SLOCK(p);
rufetch(p, &kp->ki_rusage);
kp->ki_runtime = cputick2usec(p->p_rux.rux_runtime);
calcru(p, &kp->ki_rusage.ru_utime, &kp->ki_rusage.ru_stime);
PROC_SUNLOCK(p);
calccru(p, &kp->ki_childutime, &kp->ki_childstime);
/* Some callers want child times in a single value. */
kp->ki_childtime = kp->ki_childstime;
timevaladd(&kp->ki_childtime, &kp->ki_childutime);
tp = NULL;
if (p->p_pgrp) {
kp->ki_pgid = p->p_pgrp->pg_id;
kp->ki_jobc = p->p_pgrp->pg_jobc;
sp = p->p_pgrp->pg_session;
if (sp != NULL) {
kp->ki_sid = sp->s_sid;
SESS_LOCK(sp);
strlcpy(kp->ki_login, sp->s_login,
sizeof(kp->ki_login));
if (sp->s_ttyvp)
kp->ki_kiflag |= KI_CTTY;
if (SESS_LEADER(p))
kp->ki_kiflag |= KI_SLEADER;
/* XXX proctree_lock */
tp = sp->s_ttyp;
SESS_UNLOCK(sp);
}
}
if ((p->p_flag & P_CONTROLT) && tp != NULL) {
kp->ki_tdev = tty_udev(tp);
kp->ki_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
if (tp->t_session)
kp->ki_tsid = tp->t_session->s_sid;
} else
kp->ki_tdev = NODEV;
if (p->p_comm[0] != '\0')
strlcpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm));
if (p->p_sysent && p->p_sysent->sv_name != NULL &&
p->p_sysent->sv_name[0] != '\0')
strlcpy(kp->ki_emul, p->p_sysent->sv_name, sizeof(kp->ki_emul));
kp->ki_siglist = p->p_siglist;
kp->ki_xstat = p->p_xstat;
kp->ki_acflag = p->p_acflag;
kp->ki_lock = p->p_lock;
if (p->p_pptr)
kp->ki_ppid = p->p_pptr->p_pid;
}
/*
* Fill in information that is thread specific. Must be called with
* target process locked. If 'preferthread' is set, overwrite certain
* process-related fields that are maintained for both threads and
* processes.
*/
static void
fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp, int preferthread)
{
struct proc *p;
p = td->td_proc;
kp->ki_tdaddr = td;
PROC_LOCK_ASSERT(p, MA_OWNED);
thread_lock(td);
if (td->td_wmesg != NULL)
strlcpy(kp->ki_wmesg, td->td_wmesg, sizeof(kp->ki_wmesg));
else
bzero(kp->ki_wmesg, sizeof(kp->ki_wmesg));
strlcpy(kp->ki_ocomm, td->td_name, sizeof(kp->ki_ocomm));
if (TD_ON_LOCK(td)) {
kp->ki_kiflag |= KI_LOCKBLOCK;
strlcpy(kp->ki_lockname, td->td_lockname,
sizeof(kp->ki_lockname));
} else {
kp->ki_kiflag &= ~KI_LOCKBLOCK;
bzero(kp->ki_lockname, sizeof(kp->ki_lockname));
}
if (p->p_state == PRS_NORMAL) { /* approximate. */
if (TD_ON_RUNQ(td) ||
TD_CAN_RUN(td) ||
TD_IS_RUNNING(td)) {
kp->ki_stat = SRUN;
} else if (P_SHOULDSTOP(p)) {
kp->ki_stat = SSTOP;
} else if (TD_IS_SLEEPING(td)) {
kp->ki_stat = SSLEEP;
} else if (TD_ON_LOCK(td)) {
kp->ki_stat = SLOCK;
} else {
kp->ki_stat = SWAIT;
}
} else if (p->p_state == PRS_ZOMBIE) {
kp->ki_stat = SZOMB;
} else {
kp->ki_stat = SIDL;
}
/* Things in the thread */
kp->ki_wchan = td->td_wchan;
kp->ki_pri.pri_level = td->td_priority;
kp->ki_pri.pri_native = td->td_base_pri;
kp->ki_lastcpu = td->td_lastcpu;
kp->ki_oncpu = td->td_oncpu;
kp->ki_tdflags = td->td_flags;
kp->ki_tid = td->td_tid;
kp->ki_numthreads = p->p_numthreads;
kp->ki_pcb = td->td_pcb;
kp->ki_kstack = (void *)td->td_kstack;
kp->ki_slptime = (ticks - td->td_slptick) / hz;
kp->ki_pri.pri_class = td->td_pri_class;
kp->ki_pri.pri_user = td->td_user_pri;
if (preferthread) {
kp->ki_runtime = cputick2usec(td->td_rux.rux_runtime);
kp->ki_pctcpu = sched_pctcpu(td);
kp->ki_estcpu = td->td_estcpu;
}
/* We can't get this anymore but ps etc never used it anyway. */
kp->ki_rqindex = 0;
if (preferthread)
kp->ki_siglist = td->td_siglist;
kp->ki_sigmask = td->td_sigmask;
thread_unlock(td);
}
/*
* Fill in a kinfo_proc structure for the specified process.
* Must be called with the target process locked.
*/
void
fill_kinfo_proc(struct proc *p, struct kinfo_proc *kp)
{
MPASS(FIRST_THREAD_IN_PROC(p) != NULL);
fill_kinfo_proc_only(p, kp);
fill_kinfo_thread(FIRST_THREAD_IN_PROC(p), kp, 0);
fill_kinfo_aggregate(p, kp);
}
struct pstats *
pstats_alloc(void)
{
return (malloc(sizeof(struct pstats), M_SUBPROC, M_ZERO|M_WAITOK));
}
/*
* Copy parts of p_stats; zero the rest of p_stats (statistics).
*/
void
pstats_fork(struct pstats *src, struct pstats *dst)
{
bzero(&dst->pstat_startzero,
__rangeof(struct pstats, pstat_startzero, pstat_endzero));
bcopy(&src->pstat_startcopy, &dst->pstat_startcopy,
__rangeof(struct pstats, pstat_startcopy, pstat_endcopy));
}
void
pstats_free(struct pstats *ps)
{
free(ps, M_SUBPROC);
}
/*
* Locate a zombie process by number
*/
struct proc *
zpfind(pid_t pid)
{
struct proc *p;
sx_slock(&allproc_lock);
LIST_FOREACH(p, &zombproc, p_list)
if (p->p_pid == pid) {
PROC_LOCK(p);
break;
}
sx_sunlock(&allproc_lock);
return (p);
}
#define KERN_PROC_ZOMBMASK 0x3
#define KERN_PROC_NOTHREADS 0x4
#ifdef COMPAT_FREEBSD32
/*
* This function is typically used to copy out the kernel address, so
* it can be replaced by assignment of zero.
*/
static inline uint32_t
ptr32_trim(void *ptr)
{
uintptr_t uptr;
uptr = (uintptr_t)ptr;
return ((uptr > UINT_MAX) ? 0 : uptr);
}
#define PTRTRIM_CP(src,dst,fld) \
do { (dst).fld = ptr32_trim((src).fld); } while (0)
static void
freebsd32_kinfo_proc_out(const struct kinfo_proc *ki, struct kinfo_proc32 *ki32)
{
int i;
bzero(ki32, sizeof(struct kinfo_proc32));
ki32->ki_structsize = sizeof(struct kinfo_proc32);
CP(*ki, *ki32, ki_layout);
PTRTRIM_CP(*ki, *ki32, ki_args);
PTRTRIM_CP(*ki, *ki32, ki_paddr);
PTRTRIM_CP(*ki, *ki32, ki_addr);
PTRTRIM_CP(*ki, *ki32, ki_tracep);
PTRTRIM_CP(*ki, *ki32, ki_textvp);
PTRTRIM_CP(*ki, *ki32, ki_fd);
PTRTRIM_CP(*ki, *ki32, ki_vmspace);
PTRTRIM_CP(*ki, *ki32, ki_wchan);
CP(*ki, *ki32, ki_pid);
CP(*ki, *ki32, ki_ppid);
CP(*ki, *ki32, ki_pgid);
CP(*ki, *ki32, ki_tpgid);
CP(*ki, *ki32, ki_sid);
CP(*ki, *ki32, ki_tsid);
CP(*ki, *ki32, ki_jobc);
CP(*ki, *ki32, ki_tdev);
CP(*ki, *ki32, ki_siglist);
CP(*ki, *ki32, ki_sigmask);
CP(*ki, *ki32, ki_sigignore);
CP(*ki, *ki32, ki_sigcatch);
CP(*ki, *ki32, ki_uid);
CP(*ki, *ki32, ki_ruid);
CP(*ki, *ki32, ki_svuid);
CP(*ki, *ki32, ki_rgid);
CP(*ki, *ki32, ki_svgid);
CP(*ki, *ki32, ki_ngroups);
for (i = 0; i < KI_NGROUPS; i++)
CP(*ki, *ki32, ki_groups[i]);
CP(*ki, *ki32, ki_size);
CP(*ki, *ki32, ki_rssize);
CP(*ki, *ki32, ki_swrss);
CP(*ki, *ki32, ki_tsize);
CP(*ki, *ki32, ki_dsize);
CP(*ki, *ki32, ki_ssize);
CP(*ki, *ki32, ki_xstat);
CP(*ki, *ki32, ki_acflag);
CP(*ki, *ki32, ki_pctcpu);
CP(*ki, *ki32, ki_estcpu);
CP(*ki, *ki32, ki_slptime);
CP(*ki, *ki32, ki_swtime);
CP(*ki, *ki32, ki_runtime);
TV_CP(*ki, *ki32, ki_start);
TV_CP(*ki, *ki32, ki_childtime);
CP(*ki, *ki32, ki_flag);
CP(*ki, *ki32, ki_kiflag);
CP(*ki, *ki32, ki_traceflag);
CP(*ki, *ki32, ki_stat);
CP(*ki, *ki32, ki_nice);
CP(*ki, *ki32, ki_lock);
CP(*ki, *ki32, ki_rqindex);
CP(*ki, *ki32, ki_oncpu);
CP(*ki, *ki32, ki_lastcpu);
bcopy(ki->ki_ocomm, ki32->ki_ocomm, OCOMMLEN + 1);
bcopy(ki->ki_wmesg, ki32->ki_wmesg, WMESGLEN + 1);
bcopy(ki->ki_login, ki32->ki_login, LOGNAMELEN + 1);
bcopy(ki->ki_lockname, ki32->ki_lockname, LOCKNAMELEN + 1);
bcopy(ki->ki_comm, ki32->ki_comm, COMMLEN + 1);
bcopy(ki->ki_emul, ki32->ki_emul, KI_EMULNAMELEN + 1);
bcopy(ki->ki_loginclass, ki32->ki_loginclass, LOGINCLASSLEN + 1);
CP(*ki, *ki32, ki_cr_flags);
CP(*ki, *ki32, ki_jid);
CP(*ki, *ki32, ki_numthreads);
CP(*ki, *ki32, ki_tid);
CP(*ki, *ki32, ki_pri);
freebsd32_rusage_out(&ki->ki_rusage, &ki32->ki_rusage);
freebsd32_rusage_out(&ki->ki_rusage_ch, &ki32->ki_rusage_ch);
PTRTRIM_CP(*ki, *ki32, ki_pcb);
PTRTRIM_CP(*ki, *ki32, ki_kstack);
PTRTRIM_CP(*ki, *ki32, ki_udata);
CP(*ki, *ki32, ki_sflag);
CP(*ki, *ki32, ki_tdflags);
}
static int
sysctl_out_proc_copyout(struct kinfo_proc *ki, struct sysctl_req *req)
{
struct kinfo_proc32 ki32;
int error;
if (req->flags & SCTL_MASK32) {
freebsd32_kinfo_proc_out(ki, &ki32);
error = SYSCTL_OUT(req, &ki32, sizeof(struct kinfo_proc32));
} else
error = SYSCTL_OUT(req, ki, sizeof(struct kinfo_proc));
return (error);
}
#else
static int
sysctl_out_proc_copyout(struct kinfo_proc *ki, struct sysctl_req *req)
{
return (SYSCTL_OUT(req, ki, sizeof(struct kinfo_proc)));
}
#endif
/*
* Must be called with the process locked and will return with it unlocked.
*/
static int
sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
{
struct thread *td;
struct kinfo_proc kinfo_proc;
int error = 0;
struct proc *np;
pid_t pid = p->p_pid;
PROC_LOCK_ASSERT(p, MA_OWNED);
MPASS(FIRST_THREAD_IN_PROC(p) != NULL);
fill_kinfo_proc(p, &kinfo_proc);
if (flags & KERN_PROC_NOTHREADS)
error = sysctl_out_proc_copyout(&kinfo_proc, req);
else {
FOREACH_THREAD_IN_PROC(p, td) {
fill_kinfo_thread(td, &kinfo_proc, 1);
error = sysctl_out_proc_copyout(&kinfo_proc, req);
if (error)
break;
}
}
PROC_UNLOCK(p);
if (error)
return (error);
if (flags & KERN_PROC_ZOMBMASK)
np = zpfind(pid);
else {
if (pid == 0)
return (0);
np = pfind(pid);
}
if (np == NULL)
return (ESRCH);
if (np != p) {
PROC_UNLOCK(np);
return (ESRCH);
}
PROC_UNLOCK(np);
return (0);
}
static int
sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
{
int *name = (int*) arg1;
u_int namelen = arg2;
struct proc *p;
int flags, doingzomb, oid_number;
int error = 0;
oid_number = oidp->oid_number;
if (oid_number != KERN_PROC_ALL &&
(oid_number & KERN_PROC_INC_THREAD) == 0)
flags = KERN_PROC_NOTHREADS;
else {
flags = 0;
oid_number &= ~KERN_PROC_INC_THREAD;
}
if (oid_number == KERN_PROC_PID) {
if (namelen != 1)
return (EINVAL);
error = sysctl_wire_old_buffer(req, 0);
if (error)
return (error);
p = pfind((pid_t)name[0]);
if (!p)
return (ESRCH);
if ((error = p_cansee(curthread, p))) {
PROC_UNLOCK(p);
return (error);
}
error = sysctl_out_proc(p, req, flags);
return (error);
}
switch (oid_number) {
case KERN_PROC_ALL:
if (namelen != 0)
return (EINVAL);
break;
case KERN_PROC_PROC:
if (namelen != 0 && namelen != 1)
return (EINVAL);
break;
default:
if (namelen != 1)
return (EINVAL);
break;
}
if (!req->oldptr) {
/* overestimate by 5 procs */
error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
if (error)
return (error);
}
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
sx_slock(&allproc_lock);
for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
if (!doingzomb)
p = LIST_FIRST(&allproc);
else
p = LIST_FIRST(&zombproc);
for (; p != 0; p = LIST_NEXT(p, p_list)) {
/*
* Skip embryonic processes.
*/
PROC_LOCK(p);
if (p->p_state == PRS_NEW) {
PROC_UNLOCK(p);
continue;
}
KASSERT(p->p_ucred != NULL,
("process credential is NULL for non-NEW proc"));
/*
* Show a user only appropriate processes.
*/
if (p_cansee(curthread, p)) {
PROC_UNLOCK(p);
continue;
}
/*
* TODO - make more efficient (see notes below).
* do by session.
*/
switch (oid_number) {
case KERN_PROC_GID:
if (p->p_ucred->cr_gid != (gid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_PGRP:
/* could do this by traversing pgrp */
if (p->p_pgrp == NULL ||
p->p_pgrp->pg_id != (pid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_RGID:
if (p->p_ucred->cr_rgid != (gid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_SESSION:
if (p->p_session == NULL ||
p->p_session->s_sid != (pid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_TTY:
if ((p->p_flag & P_CONTROLT) == 0 ||
p->p_session == NULL) {
PROC_UNLOCK(p);
continue;
}
/* XXX proctree_lock */
SESS_LOCK(p->p_session);
if (p->p_session->s_ttyp == NULL ||
tty_udev(p->p_session->s_ttyp) !=
(dev_t)name[0]) {
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
continue;
}
SESS_UNLOCK(p->p_session);
break;
case KERN_PROC_UID:
if (p->p_ucred->cr_uid != (uid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_RUID:
if (p->p_ucred->cr_ruid != (uid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_PROC:
break;
default:
break;
}
error = sysctl_out_proc(p, req, flags | doingzomb);
if (error) {
sx_sunlock(&allproc_lock);
return (error);
}
}
}
sx_sunlock(&allproc_lock);
return (0);
}
struct pargs *
pargs_alloc(int len)
{
struct pargs *pa;
pa = malloc(sizeof(struct pargs) + len, M_PARGS,
M_WAITOK);
refcount_init(&pa->ar_ref, 1);
pa->ar_length = len;
return (pa);
}
static void
pargs_free(struct pargs *pa)
{
free(pa, M_PARGS);
}
void
pargs_hold(struct pargs *pa)
{
if (pa == NULL)
return;
refcount_acquire(&pa->ar_ref);
}
void
pargs_drop(struct pargs *pa)
{
if (pa == NULL)
return;
if (refcount_release(&pa->ar_ref))
pargs_free(pa);
}
/*
* This sysctl allows a process to retrieve the argument list or process
* title for another process without groping around in the address space
* of the other process. It also allow a process to set its own "process
* title to a string of its own choice.
*/
static int
sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
{
int *name = (int*) arg1;
u_int namelen = arg2;
struct pargs *newpa, *pa;
struct proc *p;
int error = 0;
if (namelen != 1)
return (EINVAL);
p = pfind((pid_t)name[0]);
if (!p)
return (ESRCH);
if ((error = p_cansee(curthread, p)) != 0) {
PROC_UNLOCK(p);
return (error);
}
if (req->newptr && curproc != p) {
PROC_UNLOCK(p);
return (EPERM);
}
pa = p->p_args;
pargs_hold(pa);
PROC_UNLOCK(p);
if (req->oldptr != NULL && pa != NULL)
error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
pargs_drop(pa);
if (error != 0 || req->newptr == NULL)
return (error);
if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
return (ENOMEM);
newpa = pargs_alloc(req->newlen);
error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
if (error != 0) {
pargs_free(newpa);
return (error);
}
PROC_LOCK(p);
pa = p->p_args;
p->p_args = newpa;
PROC_UNLOCK(p);
pargs_drop(pa);
return (0);
}
/*
* This sysctl allows a process to retrieve the path of the executable for
* itself or another process.
*/
static int
sysctl_kern_proc_pathname(SYSCTL_HANDLER_ARGS)
{
pid_t *pidp = (pid_t *)arg1;
unsigned int arglen = arg2;
struct proc *p;
struct vnode *vp;
char *retbuf, *freebuf;
int error, vfslocked;
if (arglen != 1)
return (EINVAL);
if (*pidp == -1) { /* -1 means this process */
p = req->td->td_proc;
} else {
p = pfind(*pidp);
if (p == NULL)
return (ESRCH);
if ((error = p_cansee(curthread, p)) != 0) {
PROC_UNLOCK(p);
return (error);
}
}
vp = p->p_textvp;
if (vp == NULL) {
if (*pidp != -1)
PROC_UNLOCK(p);
return (0);
}
vref(vp);
if (*pidp != -1)
PROC_UNLOCK(p);
error = vn_fullpath(req->td, vp, &retbuf, &freebuf);
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vrele(vp);
VFS_UNLOCK_GIANT(vfslocked);
if (error)
return (error);
error = SYSCTL_OUT(req, retbuf, strlen(retbuf) + 1);
free(freebuf, M_TEMP);
return (error);
}
static int
sysctl_kern_proc_sv_name(SYSCTL_HANDLER_ARGS)
{
struct proc *p;
char *sv_name;
int *name;
int namelen;
int error;
namelen = arg2;
if (namelen != 1)
return (EINVAL);
name = (int *)arg1;
if ((p = pfind((pid_t)name[0])) == NULL)
return (ESRCH);
if ((error = p_cansee(curthread, p))) {
PROC_UNLOCK(p);
return (error);
}
sv_name = p->p_sysent->sv_name;
PROC_UNLOCK(p);
return (sysctl_handle_string(oidp, sv_name, 0, req));
}
#ifdef KINFO_OVMENTRY_SIZE
CTASSERT(sizeof(struct kinfo_ovmentry) == KINFO_OVMENTRY_SIZE);
#endif
#ifdef COMPAT_FREEBSD7
static int
sysctl_kern_proc_ovmmap(SYSCTL_HANDLER_ARGS)
{
vm_map_entry_t entry, tmp_entry;
unsigned int last_timestamp;
char *fullpath, *freepath;
struct kinfo_ovmentry *kve;
struct vattr va;
struct ucred *cred;
int error, *name;
struct vnode *vp;
struct proc *p;
vm_map_t map;
struct vmspace *vm;
name = (int *)arg1;
if ((p = pfind((pid_t)name[0])) == NULL)
return (ESRCH);
if (p->p_flag & P_WEXIT) {
PROC_UNLOCK(p);
return (ESRCH);
}
if ((error = p_candebug(curthread, p))) {
PROC_UNLOCK(p);
return (error);
}
_PHOLD(p);
PROC_UNLOCK(p);
vm = vmspace_acquire_ref(p);
if (vm == NULL) {
PRELE(p);
return (ESRCH);
}
kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK);
map = &p->p_vmspace->vm_map; /* XXXRW: More locking required? */
vm_map_lock_read(map);
for (entry = map->header.next; entry != &map->header;
entry = entry->next) {
vm_object_t obj, tobj, lobj;
vm_offset_t addr;
int vfslocked;
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
continue;
bzero(kve, sizeof(*kve));
kve->kve_structsize = sizeof(*kve);
kve->kve_private_resident = 0;
obj = entry->object.vm_object;
if (obj != NULL) {
VM_OBJECT_LOCK(obj);
if (obj->shadow_count == 1)
kve->kve_private_resident =
obj->resident_page_count;
}
kve->kve_resident = 0;
addr = entry->start;
while (addr < entry->end) {
if (pmap_extract(map->pmap, addr))
kve->kve_resident++;
addr += PAGE_SIZE;
}
for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
if (tobj != obj)
VM_OBJECT_LOCK(tobj);
if (lobj != obj)
VM_OBJECT_UNLOCK(lobj);
lobj = tobj;
}
kve->kve_start = (void*)entry->start;
kve->kve_end = (void*)entry->end;
kve->kve_offset = (off_t)entry->offset;
if (entry->protection & VM_PROT_READ)
kve->kve_protection |= KVME_PROT_READ;
if (entry->protection & VM_PROT_WRITE)
kve->kve_protection |= KVME_PROT_WRITE;
if (entry->protection & VM_PROT_EXECUTE)
kve->kve_protection |= KVME_PROT_EXEC;
if (entry->eflags & MAP_ENTRY_COW)
kve->kve_flags |= KVME_FLAG_COW;
if (entry->eflags & MAP_ENTRY_NEEDS_COPY)
kve->kve_flags |= KVME_FLAG_NEEDS_COPY;
if (entry->eflags & MAP_ENTRY_NOCOREDUMP)
kve->kve_flags |= KVME_FLAG_NOCOREDUMP;
last_timestamp = map->timestamp;
vm_map_unlock_read(map);
kve->kve_fileid = 0;
kve->kve_fsid = 0;
freepath = NULL;
fullpath = "";
if (lobj) {
vp = NULL;
switch (lobj->type) {
case OBJT_DEFAULT:
kve->kve_type = KVME_TYPE_DEFAULT;
break;
case OBJT_VNODE:
kve->kve_type = KVME_TYPE_VNODE;
vp = lobj->handle;
vref(vp);
break;
case OBJT_SWAP:
kve->kve_type = KVME_TYPE_SWAP;
break;
case OBJT_DEVICE:
kve->kve_type = KVME_TYPE_DEVICE;
break;
case OBJT_PHYS:
kve->kve_type = KVME_TYPE_PHYS;
break;
case OBJT_DEAD:
kve->kve_type = KVME_TYPE_DEAD;
break;
case OBJT_SG:
kve->kve_type = KVME_TYPE_SG;
break;
default:
kve->kve_type = KVME_TYPE_UNKNOWN;
break;
}
if (lobj != obj)
VM_OBJECT_UNLOCK(lobj);
kve->kve_ref_count = obj->ref_count;
kve->kve_shadow_count = obj->shadow_count;
VM_OBJECT_UNLOCK(obj);
if (vp != NULL) {
vn_fullpath(curthread, vp, &fullpath,
&freepath);
cred = curthread->td_ucred;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vn_lock(vp, LK_SHARED | LK_RETRY);
if (VOP_GETATTR(vp, &va, cred) == 0) {
kve->kve_fileid = va.va_fileid;
kve->kve_fsid = va.va_fsid;
}
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
}
} else {
kve->kve_type = KVME_TYPE_NONE;
kve->kve_ref_count = 0;
kve->kve_shadow_count = 0;
}
strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path));
if (freepath != NULL)
free(freepath, M_TEMP);
error = SYSCTL_OUT(req, kve, sizeof(*kve));
vm_map_lock_read(map);
if (error)
break;
if (last_timestamp != map->timestamp) {
vm_map_lookup_entry(map, addr - 1, &tmp_entry);
entry = tmp_entry;
}
}
vm_map_unlock_read(map);
vmspace_free(vm);
PRELE(p);
free(kve, M_TEMP);
return (error);
}
#endif /* COMPAT_FREEBSD7 */
#ifdef KINFO_VMENTRY_SIZE
CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
#endif
static int
sysctl_kern_proc_vmmap(SYSCTL_HANDLER_ARGS)
{
vm_map_entry_t entry, tmp_entry;
unsigned int last_timestamp;
char *fullpath, *freepath;
struct kinfo_vmentry *kve;
struct vattr va;
struct ucred *cred;
int error, *name;
struct vnode *vp;
struct proc *p;
struct vmspace *vm;
vm_map_t map;
name = (int *)arg1;
if ((p = pfind((pid_t)name[0])) == NULL)
return (ESRCH);
if (p->p_flag & P_WEXIT) {
PROC_UNLOCK(p);
return (ESRCH);
}
if ((error = p_candebug(curthread, p))) {
PROC_UNLOCK(p);
return (error);
}
_PHOLD(p);
PROC_UNLOCK(p);
vm = vmspace_acquire_ref(p);
if (vm == NULL) {
PRELE(p);
return (ESRCH);
}
kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK);
map = &vm->vm_map; /* XXXRW: More locking required? */
vm_map_lock_read(map);
for (entry = map->header.next; entry != &map->header;
entry = entry->next) {
vm_object_t obj, tobj, lobj;
vm_offset_t addr;
int vfslocked;
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
continue;
bzero(kve, sizeof(*kve));
kve->kve_private_resident = 0;
obj = entry->object.vm_object;
if (obj != NULL) {
VM_OBJECT_LOCK(obj);
if (obj->shadow_count == 1)
kve->kve_private_resident =
obj->resident_page_count;
}
kve->kve_resident = 0;
addr = entry->start;
while (addr < entry->end) {
if (pmap_extract(map->pmap, addr))
kve->kve_resident++;
addr += PAGE_SIZE;
}
for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
if (tobj != obj)
VM_OBJECT_LOCK(tobj);
if (lobj != obj)
VM_OBJECT_UNLOCK(lobj);
lobj = tobj;
}
kve->kve_start = entry->start;
kve->kve_end = entry->end;
kve->kve_offset = entry->offset;
if (entry->protection & VM_PROT_READ)
kve->kve_protection |= KVME_PROT_READ;
if (entry->protection & VM_PROT_WRITE)
kve->kve_protection |= KVME_PROT_WRITE;
if (entry->protection & VM_PROT_EXECUTE)
kve->kve_protection |= KVME_PROT_EXEC;
if (entry->eflags & MAP_ENTRY_COW)
kve->kve_flags |= KVME_FLAG_COW;
if (entry->eflags & MAP_ENTRY_NEEDS_COPY)
kve->kve_flags |= KVME_FLAG_NEEDS_COPY;
if (entry->eflags & MAP_ENTRY_NOCOREDUMP)
kve->kve_flags |= KVME_FLAG_NOCOREDUMP;
last_timestamp = map->timestamp;
vm_map_unlock_read(map);
kve->kve_fileid = 0;
kve->kve_fsid = 0;
freepath = NULL;
fullpath = "";
if (lobj) {
vp = NULL;
switch (lobj->type) {
case OBJT_DEFAULT:
kve->kve_type = KVME_TYPE_DEFAULT;
break;
case OBJT_VNODE:
kve->kve_type = KVME_TYPE_VNODE;
vp = lobj->handle;
vref(vp);
break;
case OBJT_SWAP:
kve->kve_type = KVME_TYPE_SWAP;
break;
case OBJT_DEVICE:
kve->kve_type = KVME_TYPE_DEVICE;
break;
case OBJT_PHYS:
kve->kve_type = KVME_TYPE_PHYS;
break;
case OBJT_DEAD:
kve->kve_type = KVME_TYPE_DEAD;
break;
case OBJT_SG:
kve->kve_type = KVME_TYPE_SG;
break;
default:
kve->kve_type = KVME_TYPE_UNKNOWN;
break;
}
if (lobj != obj)
VM_OBJECT_UNLOCK(lobj);
kve->kve_ref_count = obj->ref_count;
kve->kve_shadow_count = obj->shadow_count;
VM_OBJECT_UNLOCK(obj);
if (vp != NULL) {
vn_fullpath(curthread, vp, &fullpath,
&freepath);
cred = curthread->td_ucred;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vn_lock(vp, LK_SHARED | LK_RETRY);
if (VOP_GETATTR(vp, &va, cred) == 0) {
kve->kve_fileid = va.va_fileid;
kve->kve_fsid = va.va_fsid;
}
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);
}
} else {
kve->kve_type = KVME_TYPE_NONE;
kve->kve_ref_count = 0;
kve->kve_shadow_count = 0;
}
strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path));
if (freepath != NULL)
free(freepath, M_TEMP);
/* Pack record size down */
kve->kve_structsize = offsetof(struct kinfo_vmentry, kve_path) +
strlen(kve->kve_path) + 1;
kve->kve_structsize = roundup(kve->kve_structsize,
sizeof(uint64_t));
error = SYSCTL_OUT(req, kve, kve->kve_structsize);
vm_map_lock_read(map);
if (error)
break;
if (last_timestamp != map->timestamp) {
vm_map_lookup_entry(map, addr - 1, &tmp_entry);
entry = tmp_entry;
}
}
vm_map_unlock_read(map);
vmspace_free(vm);
PRELE(p);
free(kve, M_TEMP);
return (error);
}
#if defined(STACK) || defined(DDB)
static int
sysctl_kern_proc_kstack(SYSCTL_HANDLER_ARGS)
{
struct kinfo_kstack *kkstp;
int error, i, *name, numthreads;
lwpid_t *lwpidarray;
struct thread *td;
struct stack *st;
struct sbuf sb;
struct proc *p;
name = (int *)arg1;
if ((p = pfind((pid_t)name[0])) == NULL)
return (ESRCH);
/* XXXRW: Not clear ESRCH is the right error during proc execve(). */
if (p->p_flag & P_WEXIT || p->p_flag & P_INEXEC) {
PROC_UNLOCK(p);
return (ESRCH);
}
if ((error = p_candebug(curthread, p))) {
PROC_UNLOCK(p);
return (error);
}
_PHOLD(p);
PROC_UNLOCK(p);
kkstp = malloc(sizeof(*kkstp), M_TEMP, M_WAITOK);
st = stack_create();
lwpidarray = NULL;
numthreads = 0;
PROC_LOCK(p);
repeat:
if (numthreads < p->p_numthreads) {
if (lwpidarray != NULL) {
free(lwpidarray, M_TEMP);
lwpidarray = NULL;
}
numthreads = p->p_numthreads;
PROC_UNLOCK(p);
lwpidarray = malloc(sizeof(*lwpidarray) * numthreads, M_TEMP,
M_WAITOK | M_ZERO);
PROC_LOCK(p);
goto repeat;
}
i = 0;
/*
* XXXRW: During the below loop, execve(2) and countless other sorts
* of changes could have taken place. Should we check to see if the
* vmspace has been replaced, or the like, in order to prevent
* giving a snapshot that spans, say, execve(2), with some threads
* before and some after? Among other things, the credentials could
* have changed, in which case the right to extract debug info might
* no longer be assured.
*/
FOREACH_THREAD_IN_PROC(p, td) {
KASSERT(i < numthreads,
("sysctl_kern_proc_kstack: numthreads"));
lwpidarray[i] = td->td_tid;
i++;
}
numthreads = i;
for (i = 0; i < numthreads; i++) {
td = thread_find(p, lwpidarray[i]);
if (td == NULL) {
continue;
}
bzero(kkstp, sizeof(*kkstp));
(void)sbuf_new(&sb, kkstp->kkst_trace,
sizeof(kkstp->kkst_trace), SBUF_FIXEDLEN);
thread_lock(td);
kkstp->kkst_tid = td->td_tid;
if (TD_IS_SWAPPED(td))
kkstp->kkst_state = KKST_STATE_SWAPPED;
else if (TD_IS_RUNNING(td))
kkstp->kkst_state = KKST_STATE_RUNNING;
else {
kkstp->kkst_state = KKST_STATE_STACKOK;
stack_save_td(st, td);
}
thread_unlock(td);
PROC_UNLOCK(p);
stack_sbuf_print(&sb, st);
sbuf_finish(&sb);
sbuf_delete(&sb);
error = SYSCTL_OUT(req, kkstp, sizeof(*kkstp));
PROC_LOCK(p);
if (error)
break;
}
_PRELE(p);
PROC_UNLOCK(p);
if (lwpidarray != NULL)
free(lwpidarray, M_TEMP);
stack_destroy(st);
free(kkstp, M_TEMP);
return (error);
}
#endif
/*
* This sysctl allows a process to retrieve the full list of groups from
* itself or another process.
*/
static int
sysctl_kern_proc_groups(SYSCTL_HANDLER_ARGS)
{
pid_t *pidp = (pid_t *)arg1;
unsigned int arglen = arg2;
struct proc *p;
struct ucred *cred;
int error;
if (arglen != 1)
return (EINVAL);
if (*pidp == -1) { /* -1 means this process */
p = req->td->td_proc;
} else {
p = pfind(*pidp);
if (p == NULL)
return (ESRCH);
if ((error = p_cansee(curthread, p)) != 0) {
PROC_UNLOCK(p);
return (error);
}
}
cred = crhold(p->p_ucred);
if (*pidp != -1)
PROC_UNLOCK(p);
error = SYSCTL_OUT(req, cred->cr_groups,
cred->cr_ngroups * sizeof(gid_t));
crfree(cred);
return (error);
}
SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT|
CTLFLAG_MPSAFE, 0, 0, sysctl_kern_proc, "S,proc",
"Return entire process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_GID, gid, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_RGID, rgid, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_SESSION, sid, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PROC, proc, CTLFLAG_RD | CTLFLAG_MPSAFE,
sysctl_kern_proc, "Return process table, no threads");
static SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args,
CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_MPSAFE,
sysctl_kern_proc_args, "Process argument list");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PATHNAME, pathname, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_pathname, "Process executable path");
static SYSCTL_NODE(_kern_proc, KERN_PROC_SV_NAME, sv_name, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_sv_name,
"Process syscall vector name (ABI type)");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_GID | KERN_PROC_INC_THREAD), gid_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_INC_THREAD), pgrp_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_RGID | KERN_PROC_INC_THREAD), rgid_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_SESSION | KERN_PROC_INC_THREAD),
sid_td, CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_INC_THREAD), tty_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_INC_THREAD), uid_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_INC_THREAD), ruid_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_INC_THREAD), pid_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_PROC | KERN_PROC_INC_THREAD), proc_td,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc,
"Return process table, no threads");
#ifdef COMPAT_FREEBSD7
static SYSCTL_NODE(_kern_proc, KERN_PROC_OVMMAP, ovmmap, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_ovmmap, "Old Process vm map entries");
#endif
static SYSCTL_NODE(_kern_proc, KERN_PROC_VMMAP, vmmap, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_vmmap, "Process vm map entries");
#if defined(STACK) || defined(DDB)
static SYSCTL_NODE(_kern_proc, KERN_PROC_KSTACK, kstack, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_kstack, "Process kernel stacks");
#endif
static SYSCTL_NODE(_kern_proc, KERN_PROC_GROUPS, groups, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_groups, "Process groups");
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