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freebsd-nq/sys/kern/kern_proc.c
Brooks Davis 838d985825 Rework the credential code to support larger values of NGROUPS and 
NGROUPS_MAX, eliminate ABI dependencies on them, and raise the to 1024
and 1023 respectively.  (Previously they were equal, but under a close
reading of POSIX, NGROUPS_MAX was defined to be too large by 1 since it
is the number of supplemental groups, not total number of groups.)

The bulk of the change consists of converting the struct ucred member
cr_groups from a static array to a pointer.  Do the equivalent in
kinfo_proc.

Introduce new interfaces crcopysafe() and crsetgroups() for duplicating
a process credential before modifying it and for setting group lists
respectively.  Both interfaces take care for the details of allocating
groups array. crsetgroups() takes care of truncating the group list
to the current maximum (NGROUPS) if necessary.  In the future,
crsetgroups() may be responsible for insuring invariants such as sorting
the supplemental groups to allow groupmember() to be implemented as a
binary search.

Because we can not change struct xucred without breaking application
ABIs, we leave it alone and introduce a new XU_NGROUPS value which is
always 16 and is to be used or NGRPS as appropriate for things such as
NFS which need to use no more than 16 groups.  When feasible, truncate
the group list rather than generating an error.

Minor changes:
  - Reduce the number of hand rolled versions of groupmember().
  - Do not assign to both cr_gid and cr_groups[0].
  - Modify ipfw to cache ucreds instead of part of their contents since
    they are immutable once referenced by more than one entity.

Submitted by:	Isilon Systems (initial implementation)
X-MFC after:	never
PR:		bin/113398 kern/133867
2009-06-19 17:10:35 +00:00

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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/lock.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 KTRACE
#include <sys/uio.h>
#include <sys/ktrace.h>
#endif
#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>
SDT_PROVIDER_DEFINE(proc);
SDT_PROBE_DEFINE(proc, kernel, ctor, 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);
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);
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);
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);
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);
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;
uma_zone_t ithread_zone;
int kstack_pages = KSTACK_PAGES;
SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, "");
CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
/*
* 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);
/* Dispose of an alternate kstack, if it exists.
* XXX What if there are more than one thread in the proc?
* The first thread in the proc is special and not
* freed, so you gotta do this here.
*/
if (((p->p_flag & P_KTHREAD) != 0) && (td->td_altkstack != 0))
vm_thread_dispose_altkstack(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");
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) {
if (p->p_state == PRS_NEW) {
p = NULL;
break;
}
PROC_LOCK(p);
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_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;
kp->ki_runtime = 0;
FOREACH_THREAD_IN_PROC(p, td) {
thread_lock(td);
kp->ki_pctcpu += sched_pctcpu(td);
kp->ki_runtime += cputick2usec(td->td_runtime);
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;
mtx_lock(&ktrace_mtx);
kp->ki_traceflag = p->p_traceflag;
mtx_unlock(&ktrace_mtx);
#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_ngroups = cred->cr_ngroups;
kp->ki_groups = cred->cr_groups;
kp->ki_rgid = cred->cr_rgid;
kp->ki_svgid = cred->cr_svgid;
kp->ki_cr_flags = cred->cr_flags;
/* 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;
}
}
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);
}
PROC_SLOCK(p);
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;
if (td0->td_altkstack_obj != NULL)
kp->ki_rssize += td0->td_altkstack_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;
rufetch(p, &kp->ki_rusage);
kp->ki_runtime = cputick2usec(p->p_rux.rux_runtime);
PROC_SUNLOCK(p);
if ((p->p_flag & P_INMEM) && p->p_stats != NULL) {
kp->ki_start = p->p_stats->p_start;
timevaladd(&kp->ki_start, &boottime);
PROC_SLOCK(p);
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 p_slock
* 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;
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));
if (td->td_name[0] != '\0')
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_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;
SIGSETOR(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
/*
* 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(req, (caddr_t)&kinfo_proc,
sizeof(kinfo_proc));
else {
FOREACH_THREAD_IN_PROC(p, td) {
fill_kinfo_thread(td, &kinfo_proc, 1);
error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc,
sizeof(kinfo_proc));
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_SLOCK(p);
if (p->p_state == PRS_NEW) {
PROC_SUNLOCK(p);
continue;
}
PROC_SUNLOCK(p);
PROC_LOCK(p);
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;
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;
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;
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;
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
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
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