/*
- * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
*
* @(#)kern_proc.c 8.4 (Berkeley) 1/4/94
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
/* HISTORY
* 04-Aug-97 Umesh Vaishampayan (umeshv@apple.com)
* Added current_proc_EXTERNAL() function for the use of kernel
#include <sys/acct.h>
#include <sys/wait.h>
#include <sys/file_internal.h>
-#include <ufs/ufs/quota.h>
#include <sys/uio.h>
#include <sys/malloc.h>
+#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/signalvar.h>
#include <sys/syslog.h>
+#include <sys/sysctl.h>
+#include <sys/sysproto.h>
+#include <sys/kauth.h>
+#include <sys/codesign.h>
#include <sys/kernel_types.h>
+#include <sys/ubc.h>
+#include <kern/kalloc.h>
+#include <kern/task.h>
+#include <kern/assert.h>
+#include <vm/vm_protos.h>
+#include <vm/vm_map.h> /* vm_map_switch_protect() */
+#include <mach/task.h>
+
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#include <libkern/crypto/sha1.h>
/*
* Structure associated with user cacheing.
u_long pidhash;
struct pgrphashhead *pgrphashtbl;
u_long pgrphash;
+struct sesshashhead *sesshashtbl;
+u_long sesshash;
+
struct proclist allproc;
struct proclist zombproc;
extern struct tty cons;
+#if CONFIG_LCTX
+/*
+ * Login Context
+ */
+static pid_t lastlcid = 1;
+static int alllctx_cnt;
+
+#define LCID_MAX 8192 /* Does this really need to be large? */
+static int maxlcid = LCID_MAX;
+
+LIST_HEAD(lctxlist, lctx);
+static struct lctxlist alllctx;
+
+lck_mtx_t alllctx_lock;
+lck_grp_t * lctx_lck_grp;
+lck_grp_attr_t * lctx_lck_grp_attr;
+lck_attr_t * lctx_lck_attr;
+
+static void lctxinit(void);
+#endif
+
+int cs_debug; /* declared further down in this file */
+
+#if DEBUG
+#define __PROC_INTERNAL_DEBUG 1
+#endif
/* Name to give to core files */
__private_extern__ char corefilename[MAXPATHLEN+1] = {"/cores/core.%P"};
static void orphanpg(struct pgrp *pg);
+void proc_name_kdp(task_t t, char * buf, int size);
+char *proc_name_address(void *p);
+
+static void pgrp_add(struct pgrp * pgrp, proc_t parent, proc_t child);
+static void pgrp_remove(proc_t p);
+static void pgrp_replace(proc_t p, struct pgrp *pgrp);
+static void pgdelete_dropref(struct pgrp *pgrp);
+extern void pg_rele_dropref(struct pgrp * pgrp);
+
+struct fixjob_iterargs {
+ struct pgrp * pg;
+ struct session * mysession;
+ int entering;
+};
+
+int fixjob_callback(proc_t, void *);
/*
* Initialize global process hashing structures.
*/
void
-procinit()
+procinit(void)
{
-
LIST_INIT(&allproc);
LIST_INIT(&zombproc);
pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
+ sesshashtbl = hashinit(maxproc / 4, M_PROC, &sesshash);
uihashtbl = hashinit(maxproc / 16, M_PROC, &uihash);
+#if CONFIG_LCTX
+ lctxinit();
+#endif
}
/*
* Change the count associated with number of processes
- * a given user is using.
+ * a given user is using. This routine protects the uihash
+ * with the list lock
*/
int
-chgproccnt(uid, diff)
- uid_t uid;
- int diff;
+chgproccnt(uid_t uid, int diff)
{
- register struct uidinfo *uip;
- register struct uihashhead *uipp;
+ struct uidinfo *uip;
+ struct uidinfo *newuip = NULL;
+ struct uihashhead *uipp;
+ int retval;
+again:
+ proc_list_lock();
uipp = UIHASH(uid);
for (uip = uipp->lh_first; uip != 0; uip = uip->ui_hash.le_next)
if (uip->ui_uid == uid)
break;
if (uip) {
uip->ui_proccnt += diff;
- if (uip->ui_proccnt > 0)
- return (uip->ui_proccnt);
+ if (uip->ui_proccnt > 0) {
+ retval = uip->ui_proccnt;
+ proc_list_unlock();
+ goto out;
+ }
if (uip->ui_proccnt < 0)
panic("chgproccnt: procs < 0");
LIST_REMOVE(uip, ui_hash);
- FREE_ZONE(uip, sizeof *uip, M_PROC);
- return (0);
+ retval = 0;
+ proc_list_unlock();
+ FREE_ZONE(uip, sizeof(*uip), M_PROC);
+ goto out;
}
if (diff <= 0) {
- if (diff == 0)
- return(0);
+ if (diff == 0) {
+ retval = 0;
+ proc_list_unlock();
+ goto out;
+ }
panic("chgproccnt: lost user");
}
- MALLOC_ZONE(uip, struct uidinfo *, sizeof(*uip), M_PROC, M_WAITOK);
- if (uip == NULL)
+ if (newuip != NULL) {
+ uip = newuip;
+ newuip = NULL;
+ LIST_INSERT_HEAD(uipp, uip, ui_hash);
+ uip->ui_uid = uid;
+ uip->ui_proccnt = diff;
+ retval = diff;
+ proc_list_unlock();
+ goto out;
+ }
+ proc_list_unlock();
+ MALLOC_ZONE(newuip, struct uidinfo *, sizeof(*uip), M_PROC, M_WAITOK);
+ if (newuip == NULL)
panic("chgproccnt: M_PROC zone depleted");
- LIST_INSERT_HEAD(uipp, uip, ui_hash);
- uip->ui_uid = uid;
- uip->ui_proccnt = diff;
- return (diff);
+ goto again;
+out:
+ if (newuip != NULL)
+ FREE_ZONE(newuip, sizeof(*uip), M_PROC);
+ return(retval);
}
/*
* Is p an inferior of the current process?
*/
int
-inferior(p)
- register struct proc *p;
+inferior(proc_t p)
{
+ int retval = 0;
+ proc_list_lock();
for (; p != current_proc(); p = p->p_pptr)
- if (p->p_pid == 0)
- return (0);
- return (1);
+ if (p->p_pid == 0)
+ goto out;
+ retval = 1;
+out:
+ proc_list_unlock();
+ return(retval);
}
+
/*
* Is p an inferior of t ?
*/
int
-isinferior(struct proc *p, struct proc *t)
+isinferior(proc_t p, proc_t t)
{
+ int retval = 0;
+ int nchecked = 0;
+ proc_t start = p;
/* if p==t they are not inferior */
if (p == t)
return(0);
- for (; p != t; p = p->p_pptr)
- if (p->p_pid == 0)
- return (0);
- return (1);
+
+ proc_list_lock();
+ for (; p != t; p = p->p_pptr) {
+ nchecked++;
+
+ /* Detect here if we're in a cycle */
+ if ((p->p_pid == 0) || (p->p_pptr == start) || (nchecked >= nprocs))
+ goto out;
+ }
+ retval = 1;
+out:
+ proc_list_unlock();
+ return(retval);
}
int
proc_isinferior(int pid1, int pid2)
{
- proc_t p;
- proc_t t;
+ proc_t p = PROC_NULL;
+ proc_t t = PROC_NULL;
+ int retval = 0;
+
+ if (((p = proc_find(pid1)) != (proc_t)0 ) && ((t = proc_find(pid2)) != (proc_t)0))
+ retval = isinferior(p, t);
- if (((p = pfind(pid1)) != (struct proc *)0 ) && ((t = pfind(pid2)) != (struct proc *)0))
- return (isinferior(p, t));
- return(0);
+ if (p != PROC_NULL)
+ proc_rele(p);
+ if (t != PROC_NULL)
+ proc_rele(t);
+
+ return(retval);
}
proc_t
proc_find(int pid)
{
- return(pfind(pid));
+ return(proc_findinternal(pid, 0));
+}
+
+proc_t
+proc_findinternal(int pid, int locked)
+{
+ proc_t p = PROC_NULL;
+
+ if (locked == 0) {
+ proc_list_lock();
+ }
+
+ p = pfind_locked(pid);
+ if ((p == PROC_NULL) || (p != proc_ref_locked(p)))
+ p = PROC_NULL;
+
+ if (locked == 0) {
+ proc_list_unlock();
+ }
+
+ return(p);
}
int
-proc_rele(__unused proc_t p)
+proc_rele(proc_t p)
{
+ proc_list_lock();
+ proc_rele_locked(p);
+ proc_list_unlock();
+
return(0);
}
proc_t
-proc_self()
+proc_self(void)
{
- return(current_proc());
+ struct proc * p;
+
+ p = current_proc();
+
+ proc_list_lock();
+ if (p != proc_ref_locked(p))
+ p = PROC_NULL;
+ proc_list_unlock();
+ return(p);
}
+
proc_t
-proc_findref(int pid)
+proc_ref_locked(proc_t p)
{
- boolean_t funnel_state;
- proc_t p;
-
- funnel_state = thread_funnel_set(kernel_flock,TRUE);
- p = pfind(pid);
+ proc_t p1 = p;
- if (p != proc_refinternal(p, 1))
- p = PROC_NULL;
-
- thread_funnel_set(kernel_flock, funnel_state);
- return(p);
+ /* if process still in creation return failure */
+ if ((p == PROC_NULL) || ((p->p_listflag & P_LIST_INCREATE) != 0))
+ return (PROC_NULL);
+ /* do not return process marked for termination */
+ if ((p->p_stat != SZOMB) && ((p->p_listflag & P_LIST_EXITED) == 0) && ((p->p_listflag & (P_LIST_DRAINWAIT | P_LIST_DRAIN | P_LIST_DEAD)) == 0))
+ p->p_refcount++;
+ else
+ p1 = PROC_NULL;
+
+ return(p1);
}
void
-proc_dropref(proc_t p)
+proc_rele_locked(proc_t p)
{
- proc_dropinternal(p, 0);
-}
+ if (p->p_refcount > 0) {
+ p->p_refcount--;
+ if ((p->p_refcount == 0) && ((p->p_listflag & P_LIST_DRAINWAIT) == P_LIST_DRAINWAIT)) {
+ p->p_listflag &= ~P_LIST_DRAINWAIT;
+ wakeup(&p->p_refcount);
+ }
+ } else
+ panic("proc_rele_locked -ve ref\n");
+}
proc_t
-proc_refinternal(proc_t p, int funneled)
+proc_find_zombref(int pid)
{
+ proc_t p1 = PROC_NULL;
+ proc_t p = PROC_NULL;
- proc_t p1 = p;
- boolean_t funnel_state = TRUE; /* need to init just to avoid warnings and build failure */
+ proc_list_lock();
- if (funneled == 0)
- funnel_state = thread_funnel_set(kernel_flock,TRUE);
-
- if ((p != PROC_NULL) &&(p->p_stat != SZOMB) && ((p->p_lflag & (P_LREFDRAINWAIT | P_LREFDRAIN | P_LREFDEAD)) == 0))
- p->p_internalref++;
- else
+ p = pfind_locked(pid);
+
+ /* if process still in creation return NULL */
+ if ((p == PROC_NULL) || ((p->p_listflag & P_LIST_INCREATE) != 0)) {
+ proc_list_unlock();
+ return (p1);
+ }
+
+ /* if process has not started exit or is being reaped, return NULL */
+ if (((p->p_listflag & P_LIST_EXITED) != 0) && ((p->p_listflag & P_LIST_WAITING) == 0)) {
+ p->p_listflag |= P_LIST_WAITING;
+ p1 = p;
+ } else
p1 = PROC_NULL;
- if (funneled == 0)
- thread_funnel_set(kernel_flock,funnel_state);
+ proc_list_unlock();
+
return(p1);
}
void
-proc_dropinternal(proc_t p, int funneled)
+proc_drop_zombref(proc_t p)
+{
+ proc_list_lock();
+ if ((p->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) {
+ p->p_listflag &= ~P_LIST_WAITING;
+ wakeup(&p->p_stat);
+ }
+ proc_list_unlock();
+}
+
+
+void
+proc_refdrain(proc_t p)
+{
+
+ proc_list_lock();
+
+ p->p_listflag |= P_LIST_DRAIN;
+ while (p->p_refcount) {
+ p->p_listflag |= P_LIST_DRAINWAIT;
+ msleep(&p->p_refcount, proc_list_mlock, 0, "proc_refdrain", 0) ;
+ }
+ p->p_listflag &= ~P_LIST_DRAIN;
+ p->p_listflag |= P_LIST_DEAD;
+
+ proc_list_unlock();
+
+
+}
+
+proc_t
+proc_parentholdref(proc_t p)
{
- boolean_t funnel_state = TRUE; /* need to init just to avoid warnings and build failure */
+ proc_t parent = PROC_NULL;
+ proc_t pp;
+ int loopcnt = 0;
+
- if (funneled == 0)
- funnel_state = thread_funnel_set(kernel_flock,TRUE);
+ proc_list_lock();
+loop:
+ pp = p->p_pptr;
+ if ((pp == PROC_NULL) || (pp->p_stat == SZOMB) || ((pp->p_listflag & (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED)) == (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED))) {
+ parent = PROC_NULL;
+ goto out;
+ }
+
+ if ((pp->p_listflag & (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED)) == P_LIST_CHILDDRSTART) {
+ pp->p_listflag |= P_LIST_CHILDDRWAIT;
+ msleep(&pp->p_childrencnt, proc_list_mlock, 0, "proc_parent", 0);
+ loopcnt++;
+ if (loopcnt == 5) {
+ parent = PROC_NULL;
+ goto out;
+ }
+ goto loop;
+ }
- if (p->p_internalref > 0) {
- p->p_internalref--;
- if ((p->p_internalref == 0) && ((p->p_lflag & P_LREFDRAINWAIT) == P_LREFDRAINWAIT)) {
- p->p_lflag &= ~P_LREFDRAINWAIT;
- wakeup(&p->p_internalref);
+ if ((pp->p_listflag & (P_LIST_CHILDDRSTART | P_LIST_CHILDDRAINED)) == 0) {
+ pp->p_parentref++;
+ parent = pp;
+ goto out;
+ }
+
+out:
+ proc_list_unlock();
+ return(parent);
+}
+int
+proc_parentdropref(proc_t p, int listlocked)
+{
+ if (listlocked == 0)
+ proc_list_lock();
+
+ if (p->p_parentref > 0) {
+ p->p_parentref--;
+ if ((p->p_parentref == 0) && ((p->p_listflag & P_LIST_PARENTREFWAIT) == P_LIST_PARENTREFWAIT)) {
+ p->p_listflag &= ~P_LIST_PARENTREFWAIT;
+ wakeup(&p->p_parentref);
}
} else
- printf("proc_dropreg -ve ref\n");
+ panic("proc_parentdropref -ve ref\n");
+ if (listlocked == 0)
+ proc_list_unlock();
+
+ return(0);
+}
- if (funneled == 0)
- thread_funnel_set(kernel_flock,funnel_state);
+void
+proc_childdrainstart(proc_t p)
+{
+#if __PROC_INTERNAL_DEBUG
+ if ((p->p_listflag & P_LIST_CHILDDRSTART) == P_LIST_CHILDDRSTART)
+ panic("proc_childdrainstart: childdrain already started\n");
+#endif
+ p->p_listflag |= P_LIST_CHILDDRSTART;
+ /* wait for all that hold parentrefs to drop */
+ while (p->p_parentref > 0) {
+ p->p_listflag |= P_LIST_PARENTREFWAIT;
+ msleep(&p->p_parentref, proc_list_mlock, 0, "proc_childdrainstart", 0) ;
+ }
+}
+
+
+void
+proc_childdrainend(proc_t p)
+{
+#if __PROC_INTERNAL_DEBUG
+ if (p->p_childrencnt > 0)
+ panic("exiting: children stil hanging around\n");
+#endif
+ p->p_listflag |= P_LIST_CHILDDRAINED;
+ if ((p->p_listflag & (P_LIST_CHILDLKWAIT |P_LIST_CHILDDRWAIT)) != 0) {
+ p->p_listflag &= ~(P_LIST_CHILDLKWAIT |P_LIST_CHILDDRWAIT);
+ wakeup(&p->p_childrencnt);
+ }
}
+void
+proc_checkdeadrefs(__unused proc_t p)
+{
+#if __PROC_INTERNAL_DEBUG
+ if ((p->p_listflag & P_LIST_INHASH) != 0)
+ panic("proc being freed and still in hash %p: %u\n", p, p->p_listflag);
+ if (p->p_childrencnt != 0)
+ panic("proc being freed and pending children cnt %p:%d\n", p, p->p_childrencnt);
+ if (p->p_refcount != 0)
+ panic("proc being freed and pending refcount %p:%d\n", p, p->p_refcount);
+ if (p->p_parentref != 0)
+ panic("proc being freed and pending parentrefs %p:%d\n", p, p->p_parentref);
+#endif
+}
int
proc_pid(proc_t p)
int
proc_ppid(proc_t p)
{
- if (p->p_pptr != (struct proc *)0)
- return(p->p_pptr->p_pid);
- return(0);
+ return(p->p_ppid);
}
int
proc_selfpid(void)
{
- struct proc *p = current_proc();
+ proc_t p = current_proc();
return(p->p_pid);
}
-
int
proc_selfppid(void)
{
- struct proc *p = current_proc();
- if (p->p_pptr)
- return(p->p_pptr->p_pid);
- else
- return(0);
+ proc_t p = current_proc();
+ return(p->p_ppid);
+}
+
+proc_t
+proc_parent(proc_t p)
+{
+ proc_t parent;
+ proc_t pp;
+
+ proc_list_lock();
+loop:
+ pp = p->p_pptr;
+ parent = proc_ref_locked(pp);
+ if ((parent == PROC_NULL) && (pp != PROC_NULL) && (pp->p_stat != SZOMB) && ((pp->p_listflag & P_LIST_EXITED) != 0) && ((pp->p_listflag & P_LIST_CHILDDRAINED)== 0)){
+ pp->p_listflag |= P_LIST_CHILDLKWAIT;
+ msleep(&pp->p_childrencnt, proc_list_mlock, 0, "proc_parent", 0);
+ goto loop;
+ }
+ proc_list_unlock();
+ return(parent);
}
+
void
proc_name(int pid, char * buf, int size)
{
- struct proc *p;
+ proc_t p;
- if ((p = pfind(pid))!= (struct proc *)0) {
- strncpy(buf, &p->p_comm[0], size);
- buf[size-1] = 0;
+ if ((p = proc_find(pid)) != PROC_NULL) {
+ strlcpy(buf, &p->p_comm[0], size);
+ proc_rele(p);
}
}
+void
+proc_name_kdp(task_t t, char * buf, int size)
+{
+ proc_t p = get_bsdtask_info(t);
+
+ if (p != PROC_NULL)
+ strlcpy(buf, &p->p_comm[0], size);
+}
+
+char *
+proc_name_address(void *p)
+{
+ return &((proc_t)p)->p_comm[0];
+}
+
void
proc_selfname(char * buf, int size)
{
- struct proc *p;
+ proc_t p;
- if ((p = current_proc())!= (struct proc *)0) {
- strncpy(buf, &p->p_comm[0], size);
- buf[size-1] = 0;
+ if ((p = current_proc())!= (proc_t)0) {
+ strlcpy(buf, &p->p_comm[0], size);
}
}
{
proc_t p;
- if ((p = pfind(pid))!= (struct proc *)0) {
+ if ((p = proc_find(pid)) != PROC_NULL) {
psignal(p, signum);
+ proc_rele(p);
}
}
proc_issignal(int pid, sigset_t mask)
{
proc_t p;
+ int error=0;
- if ((p = pfind(pid))!= (struct proc *)0) {
- return(proc_pendingsignals(p, mask));
+ if ((p = proc_find(pid)) != PROC_NULL) {
+ error = proc_pendingsignals(p, mask);
+ proc_rele(p);
}
- return(0);
+
+ return(error);
}
int
int retval = 0;
if (p)
- retval = p->p_flag & P_WEXIT;
+ retval = p->p_lflag & P_LEXIT;
return(retval? 1: 0);
}
-
int
proc_forcequota(proc_t p)
{
int
proc_suser(proc_t p)
{
- return(suser(p->p_ucred, NULL));
-
+ kauth_cred_t my_cred;
+ int error;
+
+ my_cred = kauth_cred_proc_ref(p);
+ error = suser(my_cred, &p->p_acflag);
+ kauth_cred_unref(&my_cred);
+ return(error);
}
+/*
+ * Obtain the first thread in a process
+ *
+ * XXX This is a bad thing to do; it exists predominantly to support the
+ * XXX use of proc_t's in places that should really be using
+ * XXX thread_t's instead. This maintains historical behaviour, but really
+ * XXX needs an audit of the context (proxy vs. not) to clean up.
+ */
+thread_t
+proc_thread(proc_t proc)
+{
+ uthread_t uth = TAILQ_FIRST(&proc->p_uthlist);
+
+ if (uth != NULL)
+ return(uth->uu_context.vc_thread);
+
+ return(NULL);
+}
+
kauth_cred_t
proc_ucred(proc_t p)
{
return(p->p_ucred);
}
+struct uthread *
+current_uthread()
+{
+ thread_t th = current_thread();
+
+ return((struct uthread *)get_bsdthread_info(th));
+}
+
int
proc_is64bit(proc_t p)
return(IS_64BIT_PROCESS(p));
}
-/* LP64todo - figure out how to identify 64-bit processes if NULL procp */
+int
+proc_pidversion(proc_t p)
+{
+ return(p->p_idversion);
+}
+
+uint64_t
+proc_uniqueid(proc_t p)
+{
+ return(p->p_uniqueid);
+}
+
+uint64_t
+proc_selfuniqueid(void)
+{
+ proc_t p = current_proc();
+ return(p->p_uniqueid);
+}
+
+int
+proc_getcdhash(proc_t p, unsigned char *cdhash)
+{
+ return vn_getcdhash(p->p_textvp, p->p_textoff, cdhash);
+}
+
+void
+proc_getexecutableuuid(proc_t p, unsigned char *uuidbuf, unsigned long size)
+{
+ if (size >= sizeof(p->p_uuid)) {
+ memcpy(uuidbuf, p->p_uuid, sizeof(p->p_uuid));
+ }
+}
+
+
+void
+bsd_set_dependency_capable(task_t task)
+{
+ proc_t p = get_bsdtask_info(task);
+
+ if (p) {
+ OSBitOrAtomic(P_DEPENDENCY_CAPABLE, &p->p_flag);
+ }
+}
+
+
int
IS_64BIT_PROCESS(proc_t p)
{
return(0);
}
-
/*
* Locate a process by number
*/
-struct proc *
-pfind(pid)
- register pid_t pid;
+proc_t
+pfind_locked(pid_t pid)
{
- register struct proc *p;
+ proc_t p;
+#if DEBUG
+ proc_t q;
+#endif
if (!pid)
return (kernproc);
- for (p = PIDHASH(pid)->lh_first; p != 0; p = p->p_hash.le_next)
- if (p->p_pid == pid)
+ for (p = PIDHASH(pid)->lh_first; p != 0; p = p->p_hash.le_next) {
+ if (p->p_pid == pid) {
+#if DEBUG
+ for (q = p->p_hash.le_next; q != 0; q = q->p_hash.le_next) {
+ if ((p !=q) && (q->p_pid == pid))
+ panic("two procs with same pid %p:%p:%d:%d\n", p, q, p->p_pid, q->p_pid);
+ }
+#endif
return (p);
+ }
+ }
return (NULL);
}
/*
* Locate a zombie by PID
*/
-__private_extern__ struct proc *
-pzfind(pid)
- register pid_t pid;
+__private_extern__ proc_t
+pzfind(pid_t pid)
{
- register struct proc *p;
+ proc_t p;
+
+
+ proc_list_lock();
for (p = zombproc.lh_first; p != 0; p = p->p_list.le_next)
if (p->p_pid == pid)
- return (p);
- return (NULL);
+ break;
+
+ proc_list_unlock();
+
+ return (p);
}
/*
* Locate a process group by number
*/
+
+struct pgrp *
+pgfind(pid_t pgid)
+{
+ struct pgrp * pgrp;
+
+ proc_list_lock();
+ pgrp = pgfind_internal(pgid);
+ if ((pgrp == NULL) || ((pgrp->pg_listflags & PGRP_FLAG_TERMINATE) != 0))
+ pgrp = PGRP_NULL;
+ else
+ pgrp->pg_refcount++;
+ proc_list_unlock();
+ return(pgrp);
+}
+
+
+
struct pgrp *
-pgfind(pgid)
- register pid_t pgid;
+pgfind_internal(pid_t pgid)
{
- register struct pgrp *pgrp;
+ struct pgrp *pgrp;
for (pgrp = PGRPHASH(pgid)->lh_first; pgrp != 0; pgrp = pgrp->pg_hash.le_next)
if (pgrp->pg_id == pgid)
return (NULL);
}
+void
+pg_rele(struct pgrp * pgrp)
+{
+ if(pgrp == PGRP_NULL)
+ return;
+ pg_rele_dropref(pgrp);
+}
+
+void
+pg_rele_dropref(struct pgrp * pgrp)
+{
+ proc_list_lock();
+ if ((pgrp->pg_refcount == 1) && ((pgrp->pg_listflags & PGRP_FLAG_TERMINATE) == PGRP_FLAG_TERMINATE)) {
+ proc_list_unlock();
+ pgdelete_dropref(pgrp);
+ return;
+ }
+
+ pgrp->pg_refcount--;
+ proc_list_unlock();
+}
+
+struct session *
+session_find_internal(pid_t sessid)
+{
+ struct session *sess;
+
+ for (sess = SESSHASH(sessid)->lh_first; sess != 0; sess = sess->s_hash.le_next)
+ if (sess->s_sid == sessid)
+ return (sess);
+ return (NULL);
+}
+
+
+/*
+ * Make a new process ready to become a useful member of society by making it
+ * visible in all the right places and initialize its own lists to empty.
+ *
+ * Parameters: parent The parent of the process to insert
+ * child The child process to insert
+ *
+ * Returns: (void)
+ *
+ * Notes: Insert a child process into the parents process group, assign
+ * the child the parent process pointer and PPID of the parent,
+ * place it on the parents p_children list as a sibling,
+ * initialize its own child list, place it in the allproc list,
+ * insert it in the proper hash bucket, and initialize its
+ * event list.
+ */
+void
+pinsertchild(proc_t parent, proc_t child)
+{
+ struct pgrp * pg;
+
+ LIST_INIT(&child->p_children);
+ TAILQ_INIT(&child->p_evlist);
+ child->p_pptr = parent;
+ child->p_ppid = parent->p_pid;
+
+ pg = proc_pgrp(parent);
+ pgrp_add(pg, parent, child);
+ pg_rele(pg);
+
+ proc_list_lock();
+ parent->p_childrencnt++;
+ LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
+
+ LIST_INSERT_HEAD(&allproc, child, p_list);
+ /* mark the completion of proc creation */
+ child->p_listflag &= ~P_LIST_INCREATE;
+
+ proc_list_unlock();
+
+}
/*
* Move p to a new or existing process group (and session)
+ *
+ * Returns: 0 Success
+ * ESRCH No such process
*/
int
-enterpgrp(p, pgid, mksess)
- register struct proc *p;
- pid_t pgid;
- int mksess;
+enterpgrp(proc_t p, pid_t pgid, int mksess)
{
- register struct pgrp *pgrp = pgfind(pgid);
+ struct pgrp *pgrp;
+ struct pgrp *mypgrp;
+ struct session * procsp;
+
+ pgrp = pgfind(pgid);
+ mypgrp = proc_pgrp(p);
+ procsp = proc_session(p);
#if DIAGNOSTIC
if (pgrp != NULL && mksess) /* firewalls */
panic("enterpgrp: setsid into non-empty pgrp");
- if (SESS_LEADER(p))
+ if (SESS_LEADER(p, procsp))
panic("enterpgrp: session leader attempted setpgrp");
#endif
- if (pgrp == NULL) {
+ if (pgrp == PGRP_NULL) {
pid_t savepid = p->p_pid;
- struct proc *np;
+ proc_t np = PROC_NULL;
/*
* new process group
*/
M_WAITOK);
if (pgrp == NULL)
panic("enterpgrp: M_PGRP zone depleted");
- if ((np = pfind(savepid)) == NULL || np != p) {
+ if ((np = proc_find(savepid)) == NULL || np != p) {
+ if (np != PROC_NULL)
+ proc_rele(np);
+ if (mypgrp != PGRP_NULL)
+ pg_rele(mypgrp);
+ if (procsp != SESSION_NULL)
+ session_rele(procsp);
FREE_ZONE(pgrp, sizeof(struct pgrp), M_PGRP);
return (ESRCH);
}
+ proc_rele(np);
if (mksess) {
- register struct session *sess;
+ struct session *sess;
/*
* new session
sess->s_sid = p->p_pid;
sess->s_count = 1;
sess->s_ttyvp = NULL;
- sess->s_ttyp = NULL;
- bcopy(p->p_session->s_login, sess->s_login,
+ sess->s_ttyp = TTY_NULL;
+ sess->s_flags = 0;
+ sess->s_listflags = 0;
+ sess->s_ttypgrpid = NO_PID;
+#if CONFIG_FINE_LOCK_GROUPS
+ lck_mtx_init(&sess->s_mlock, proc_mlock_grp, proc_lck_attr);
+#else
+ lck_mtx_init(&sess->s_mlock, proc_lck_grp, proc_lck_attr);
+#endif
+ bcopy(procsp->s_login, sess->s_login,
sizeof(sess->s_login));
- p->p_flag &= ~P_CONTROLT;
+ OSBitAndAtomic(~((uint32_t)P_CONTROLT), &p->p_flag);
+ proc_list_lock();
+ LIST_INSERT_HEAD(SESSHASH(sess->s_sid), sess, s_hash);
+ proc_list_unlock();
pgrp->pg_session = sess;
#if DIAGNOSTIC
if (p != current_proc())
panic("enterpgrp: mksession and p != curproc");
#endif
} else {
- pgrp->pg_session = p->p_session;
+ proc_list_lock();
+ pgrp->pg_session = procsp;
+
+ if ((pgrp->pg_session->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0)
+ panic("enterpgrp: providing ref to terminating session ");
pgrp->pg_session->s_count++;
+ proc_list_unlock();
}
pgrp->pg_id = pgid;
+#if CONFIG_FINE_LOCK_GROUPS
+ lck_mtx_init(&pgrp->pg_mlock, proc_mlock_grp, proc_lck_attr);
+#else
+ lck_mtx_init(&pgrp->pg_mlock, proc_lck_grp, proc_lck_attr);
+#endif
LIST_INIT(&pgrp->pg_members);
- LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
+ pgrp->pg_membercnt = 0;
pgrp->pg_jobc = 0;
- } else if (pgrp == p->p_pgrp)
+ proc_list_lock();
+ pgrp->pg_refcount = 1;
+ pgrp->pg_listflags = 0;
+ LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
+ proc_list_unlock();
+ } else if (pgrp == mypgrp) {
+ pg_rele(pgrp);
+ if (mypgrp != NULL)
+ pg_rele(mypgrp);
+ if (procsp != SESSION_NULL)
+ session_rele(procsp);
return (0);
+ }
+ if (procsp != SESSION_NULL)
+ session_rele(procsp);
/*
* 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);
+ fixjobc(p, mypgrp, 0);
- LIST_REMOVE(p, p_pglist);
- if (p->p_pgrp->pg_members.lh_first == 0)
- pgdelete(p->p_pgrp);
- p->p_pgrp = pgrp;
- LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
- return (0);
+ if(mypgrp != PGRP_NULL)
+ pg_rele(mypgrp);
+ pgrp_replace(p, pgrp);
+ pg_rele(pgrp);
+
+ return(0);
}
/*
* remove process from process group
*/
int
-leavepgrp(p)
- register struct proc *p;
+leavepgrp(proc_t p)
{
- LIST_REMOVE(p, p_pglist);
- if (p->p_pgrp->pg_members.lh_first == 0)
- pgdelete(p->p_pgrp);
- p->p_pgrp = 0;
+ pgrp_remove(p);
return (0);
}
/*
* delete a process group
*/
-void
-pgdelete(pgrp)
- register struct pgrp *pgrp;
+static void
+pgdelete_dropref(struct pgrp *pgrp)
{
- struct tty * ttyp;
+ struct tty *ttyp;
+ int emptypgrp = 1;
+ struct session *sessp;
- ttyp = pgrp->pg_session->s_ttyp;
- if (ttyp != NULL && pgrp->pg_session->s_ttyp->t_pgrp == pgrp) {
- pgrp->pg_session->s_ttyp->t_pgrp = NULL;
+
+ pgrp_lock(pgrp);
+ if (pgrp->pg_membercnt != 0) {
+ emptypgrp = 0;
+ }
+ pgrp_unlock(pgrp);
+
+ proc_list_lock();
+ pgrp->pg_refcount--;
+ if ((emptypgrp == 0) || (pgrp->pg_membercnt != 0)) {
+ proc_list_unlock();
+ return;
+ }
+
+ pgrp->pg_listflags |= PGRP_FLAG_TERMINATE;
+
+ if (pgrp->pg_refcount > 0) {
+ proc_list_unlock();
+ return;
}
+
+ pgrp->pg_listflags |= PGRP_FLAG_DEAD;
LIST_REMOVE(pgrp, pg_hash);
- if (--pgrp->pg_session->s_count == 0) {
- if (ttyp != NULL && (ttyp->t_session == pgrp->pg_session))
- ttyp->t_session = 0;
- FREE_ZONE(pgrp->pg_session, sizeof(struct session), M_SESSION);
+
+ proc_list_unlock();
+
+ ttyp = SESSION_TP(pgrp->pg_session);
+ if (ttyp != TTY_NULL) {
+ if (ttyp->t_pgrp == pgrp) {
+ tty_lock(ttyp);
+ /* Re-check after acquiring the lock */
+ if (ttyp->t_pgrp == pgrp) {
+ ttyp->t_pgrp = NULL;
+ pgrp->pg_session->s_ttypgrpid = NO_PID;
+ }
+ tty_unlock(ttyp);
+ }
}
- FREE_ZONE(pgrp, sizeof *pgrp, M_PGRP);
-}
-void
-sessrele(sess)
- struct session *sess;
-{
- if (--sess->s_count == 0)
- FREE_ZONE(sess, sizeof (struct session), M_SESSION);
+ proc_list_lock();
+
+ sessp = pgrp->pg_session;
+ if ((sessp->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0)
+ panic("pg_deleteref: manipulating refs of already terminating session");
+ if (--sessp->s_count == 0) {
+ if ((sessp->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0)
+ panic("pg_deleteref: terminating already terminated session");
+ sessp->s_listflags |= S_LIST_TERM;
+ ttyp = SESSION_TP(sessp);
+ LIST_REMOVE(sessp, s_hash);
+ proc_list_unlock();
+ if (ttyp != TTY_NULL) {
+ tty_lock(ttyp);
+ if (ttyp->t_session == sessp)
+ ttyp->t_session = NULL;
+ tty_unlock(ttyp);
+ }
+ proc_list_lock();
+ sessp->s_listflags |= S_LIST_DEAD;
+ if (sessp->s_count != 0)
+ panic("pg_deleteref: freeing session in use");
+ proc_list_unlock();
+#if CONFIG_FINE_LOCK_GROUPS
+ lck_mtx_destroy(&sessp->s_mlock, proc_mlock_grp);
+#else
+ lck_mtx_destroy(&sessp->s_mlock, proc_lck_grp);
+#endif
+ FREE_ZONE(sessp, sizeof(struct session), M_SESSION);
+ } else
+ proc_list_unlock();
+#if CONFIG_FINE_LOCK_GROUPS
+ lck_mtx_destroy(&pgrp->pg_mlock, proc_mlock_grp);
+#else
+ lck_mtx_destroy(&pgrp->pg_mlock, proc_lck_grp);
+#endif
+ FREE_ZONE(pgrp, sizeof(*pgrp), M_PGRP);
}
+
/*
* Adjust pgrp jobc counters when specified process changes process group.
* We count the number of processes in each process group that "qualify"
* entering == 0 => p is leaving specified group.
* entering == 1 => p is entering specified group.
*/
+int
+fixjob_callback(proc_t p, void * arg)
+{
+ struct fixjob_iterargs *fp;
+ struct pgrp * pg, *hispg;
+ struct session * mysession, *hissess;
+ int entering;
+
+ fp = (struct fixjob_iterargs *)arg;
+ pg = fp->pg;
+ mysession = fp->mysession;
+ entering = fp->entering;
+
+ hispg = proc_pgrp(p);
+ hissess = proc_session(p);
+
+ if ((hispg != pg) &&
+ (hissess == mysession)) {
+ pgrp_lock(hispg);
+ if (entering) {
+ hispg->pg_jobc++;
+ pgrp_unlock(hispg);
+ } else if (--hispg->pg_jobc == 0) {
+ pgrp_unlock(hispg);
+ orphanpg(hispg);
+ } else
+ pgrp_unlock(hispg);
+ }
+ if (hissess != SESSION_NULL)
+ session_rele(hissess);
+ if (hispg != PGRP_NULL)
+ pg_rele(hispg);
+
+ return(PROC_RETURNED);
+}
+
void
-fixjobc(struct proc *p, struct pgrp *pgrp, int entering)
+fixjobc(proc_t p, struct pgrp *pgrp, int entering)
{
- register struct pgrp *hispgrp;
- register struct session *mysession = pgrp->pg_session;
+ struct pgrp *hispgrp = PGRP_NULL;
+ struct session *hissess = SESSION_NULL;
+ struct session *mysession = pgrp->pg_session;
+ proc_t parent;
+ struct fixjob_iterargs fjarg;
+
+ parent = proc_parent(p);
+ if (parent != PROC_NULL) {
+ hispgrp = proc_pgrp(parent);
+ hissess = proc_session(parent);
+ proc_rele(parent);
+ }
+
/*
* Check p's parent to see whether p qualifies its own process
* group; if so, adjust count for p's process group.
*/
- if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
- hispgrp->pg_session == mysession) {
- if (entering)
+ if ((hispgrp != pgrp) &&
+ (hissess == mysession)) {
+ pgrp_lock(pgrp);
+ if (entering) {
pgrp->pg_jobc++;
- else if (--pgrp->pg_jobc == 0)
+ pgrp_unlock(pgrp);
+ }else if (--pgrp->pg_jobc == 0) {
+ pgrp_unlock(pgrp);
orphanpg(pgrp);
+ } else
+ pgrp_unlock(pgrp);
}
+ if (hissess != SESSION_NULL)
+ session_rele(hissess);
+ if (hispgrp != PGRP_NULL)
+ pg_rele(hispgrp);
+
/*
* Check this process' children to see whether they qualify
* their process groups; if so, adjust counts for children's
* process groups.
*/
- for (p = p->p_children.lh_first; p != 0; p = p->p_sibling.le_next)
- if ((hispgrp = p->p_pgrp) != pgrp &&
- hispgrp->pg_session == mysession &&
- p->p_stat != SZOMB) {
- if (entering)
- hispgrp->pg_jobc++;
- else if (--hispgrp->pg_jobc == 0)
- orphanpg(hispgrp);
- }
+ fjarg.pg = pgrp;
+ fjarg.mysession = mysession;
+ fjarg.entering = entering;
+ proc_childrenwalk(p, fixjob_callback, &fjarg);
}
/*
* hang-up all process in that group.
*/
static void
-orphanpg(struct pgrp *pg)
+orphanpg(struct pgrp * pgrp)
{
- register struct proc *p;
-
- for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) {
+ proc_t p;
+ pid_t * pid_list;
+ int count, pidcount, i, alloc_count;
+
+ if (pgrp == PGRP_NULL)
+ return;
+ count = 0;
+ pgrp_lock(pgrp);
+ for (p = pgrp->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) {
if (p->p_stat == SSTOP) {
- for (p = pg->pg_members.lh_first; p != 0;
- p = p->p_pglist.le_next) {
- pt_setrunnable(p);
- psignal(p, SIGHUP);
- psignal(p, SIGCONT);
- }
- return;
+ for (p = pgrp->pg_members.lh_first; p != 0;
+ p = p->p_pglist.le_next)
+ count++;
+ break; /* ??? stops after finding one.. */
}
}
-}
-
-#ifdef DEBUG
-void pgrpdump(void); /* forward declare here (called from debugger) */
-
-void
-pgrpdump(void)
-{
- struct pgrp *pgrp;
- struct proc *p;
- u_long i;
-
- for (i = 0; i <= pgrphash; i++) {
- if ((pgrp = pgrphashtbl[i].lh_first) != NULL) {
- printf("\tindx %d\n", i);
- for (; pgrp != 0; pgrp = pgrp->pg_hash.le_next) {
- printf("\tpgrp 0x%08x, pgid %d, sess %p, sesscnt %d, mem %p\n",
- pgrp, pgrp->pg_id, pgrp->pg_session,
- pgrp->pg_session->s_count,
- pgrp->pg_members.lh_first);
- for (p = pgrp->pg_members.lh_first; p != 0;
- p = p->p_pglist.le_next) {
- printf("\t\tpid %d addr 0x%08x pgrp 0x%08x\n",
- p->p_pid, p, p->p_pgrp);
- }
+ pgrp_unlock(pgrp);
+
+ count += 20;
+ if (count > hard_maxproc)
+ count = hard_maxproc;
+ alloc_count = count * sizeof(pid_t);
+ pid_list = (pid_t *)kalloc(alloc_count);
+ bzero(pid_list, alloc_count);
+
+ pidcount = 0;
+ pgrp_lock(pgrp);
+ for (p = pgrp->pg_members.lh_first; p != 0;
+ p = p->p_pglist.le_next) {
+ if (p->p_stat == SSTOP) {
+ for (p = pgrp->pg_members.lh_first; p != 0;
+ p = p->p_pglist.le_next) {
+ pid_list[pidcount] = p->p_pid;
+ pidcount++;
+ if (pidcount >= count)
+ break;
}
+ break; /* ??? stops after finding one.. */
+ }
+ }
+ pgrp_unlock(pgrp);
+
+ if (pidcount == 0)
+ goto out;
+
+
+ for (i = 0; i< pidcount; i++) {
+ /* No handling or proc0 */
+ if (pid_list[i] == 0)
+ continue;
+ p = proc_find(pid_list[i]);
+ if (p) {
+ proc_transwait(p, 0);
+ pt_setrunnable(p);
+ psignal(p, SIGHUP);
+ psignal(p, SIGCONT);
+ proc_rele(p);
}
}
+out:
+ kfree(pid_list, alloc_count);
+ return;
}
-#endif /* DEBUG */
+
+
/* XXX should be __private_extern__ */
int
-proc_is_classic(struct proc *p)
+proc_is_classic(proc_t p)
{
return (p->p_flag & P_TRANSLATED) ? 1 : 0;
}
/* XXX Why does this function exist? Need to kill it off... */
-struct proc *
+proc_t
current_proc_EXTERNAL(void)
{
return (current_proc());
* by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
* This is controlled by the sysctl variable kern.corefile (see above).
*/
-__private_extern__ char *
-proc_core_name(const char *name, uid_t uid, pid_t pid)
+__private_extern__ int
+proc_core_name(const char *name, uid_t uid, pid_t pid, char *cf_name,
+ size_t cf_name_len)
{
const char *format, *appendstr;
- char *temp;
char id_buf[11]; /* Buffer for pid/uid -- max 4B */
size_t i, l, n;
+ if (cf_name == NULL)
+ goto toolong;
+
format = corefilename;
- MALLOC(temp, char *, MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);
- if (temp == NULL)
- return (NULL);
- for (i = 0, n = 0; n < MAXPATHLEN && format[i]; i++) {
+ for (i = 0, n = 0; n < cf_name_len && format[i]; i++) {
switch (format[i]) {
case '%': /* Format character */
i++;
appendstr = name;
break;
case 'P': /* process id */
- sprintf(id_buf, "%u", pid);
+ snprintf(id_buf, sizeof(id_buf), "%u", pid);
appendstr = id_buf;
break;
case 'U': /* user id */
- sprintf(id_buf, "%u", uid);
+ snprintf(id_buf, sizeof(id_buf), "%u", uid);
appendstr = id_buf;
break;
default:
format[i], format);
}
l = strlen(appendstr);
- if ((n + l) >= MAXPATHLEN)
+ if ((n + l) >= cf_name_len)
goto toolong;
- bcopy(appendstr, temp + n, l);
+ bcopy(appendstr, cf_name + n, l);
n += l;
break;
default:
- temp[n++] = format[i];
+ cf_name[n++] = format[i];
}
}
if (format[i] != '\0')
goto toolong;
- return (temp);
+ return (0);
toolong:
- log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too long\n",
- (long)pid, name, (u_long)uid);
- FREE(temp, M_TEMP);
- return (NULL);
+ log(LOG_ERR, "pid %ld (%s), uid (%u): corename is too long\n",
+ (long)pid, name, (uint32_t)uid);
+ return (1);
+}
+
+#if CONFIG_LCTX
+
+static void
+lctxinit(void)
+{
+ LIST_INIT(&alllctx);
+ alllctx_cnt = 0;
+
+ /* allocate lctx lock group attribute and group */
+ lctx_lck_grp_attr = lck_grp_attr_alloc_init();
+ lck_grp_attr_setstat(lctx_lck_grp_attr);
+
+ lctx_lck_grp = lck_grp_alloc_init("lctx", lctx_lck_grp_attr);
+ /* Allocate lctx lock attribute */
+ lctx_lck_attr = lck_attr_alloc_init();
+
+ lck_mtx_init(&alllctx_lock, lctx_lck_grp, lctx_lck_attr);
+}
+
+/*
+ * Locate login context by number.
+ */
+struct lctx *
+lcfind(pid_t lcid)
+{
+ struct lctx *l;
+
+ ALLLCTX_LOCK;
+ LIST_FOREACH(l, &alllctx, lc_list) {
+ if (l->lc_id == lcid) {
+ LCTX_LOCK(l);
+ break;
+ }
+ }
+ ALLLCTX_UNLOCK;
+ return (l);
+}
+
+#define LCID_INC \
+ do { \
+ lastlcid++; \
+ if (lastlcid > maxlcid) \
+ lastlcid = 1; \
+ } while (0) \
+
+struct lctx *
+lccreate(void)
+{
+ struct lctx *l;
+ pid_t newlcid;
+
+ /* Not very efficient but this isn't a common operation. */
+ while ((l = lcfind(lastlcid)) != NULL) {
+ LCTX_UNLOCK(l);
+ LCID_INC;
+ }
+ newlcid = lastlcid;
+ LCID_INC;
+
+ MALLOC(l, struct lctx *, sizeof(struct lctx), M_LCTX, M_WAITOK|M_ZERO);
+ l->lc_id = newlcid;
+ LIST_INIT(&l->lc_members);
+ lck_mtx_init(&l->lc_mtx, lctx_lck_grp, lctx_lck_attr);
+#if CONFIG_MACF
+ l->lc_label = mac_lctx_label_alloc();
+#endif
+ ALLLCTX_LOCK;
+ LIST_INSERT_HEAD(&alllctx, l, lc_list);
+ alllctx_cnt++;
+ ALLLCTX_UNLOCK;
+
+ return (l);
+}
+
+/*
+ * Call with proc protected (either by being invisible
+ * or by having the all-login-context lock held) and
+ * the lctx locked.
+ *
+ * Will unlock lctx on return.
+ */
+void
+enterlctx (proc_t p, struct lctx *l, __unused int create)
+{
+ if (l == NULL)
+ return;
+
+ p->p_lctx = l;
+ LIST_INSERT_HEAD(&l->lc_members, p, p_lclist);
+ l->lc_mc++;
+
+#if CONFIG_MACF
+ if (create)
+ mac_lctx_notify_create(p, l);
+ else
+ mac_lctx_notify_join(p, l);
+#endif
+ LCTX_UNLOCK(l);
+
+ return;
+}
+
+/*
+ * Remove process from login context (if any). Called with p protected by
+ * the alllctx lock.
+ */
+void
+leavelctx (proc_t p)
+{
+ struct lctx *l;
+
+ if (p->p_lctx == NULL) {
+ return;
+ }
+
+ LCTX_LOCK(p->p_lctx);
+ l = p->p_lctx;
+ p->p_lctx = NULL;
+ LIST_REMOVE(p, p_lclist);
+ l->lc_mc--;
+#if CONFIG_MACF
+ mac_lctx_notify_leave(p, l);
+#endif
+ if (LIST_EMPTY(&l->lc_members)) {
+ LIST_REMOVE(l, lc_list);
+ alllctx_cnt--;
+ LCTX_UNLOCK(l);
+ lck_mtx_destroy(&l->lc_mtx, lctx_lck_grp);
+#if CONFIG_MACF
+ mac_lctx_label_free(l->lc_label);
+ l->lc_label = NULL;
+#endif
+ FREE(l, M_LCTX);
+ } else {
+ LCTX_UNLOCK(l);
+ }
+ return;
+}
+
+static int
+sysctl_kern_lctx SYSCTL_HANDLER_ARGS
+{
+ int *name = (int*) arg1;
+ u_int namelen = arg2;
+ struct kinfo_lctx kil;
+ struct lctx *l;
+ int error;
+
+ error = 0;
+
+ switch (oidp->oid_number) {
+ case KERN_LCTX_ALL:
+ ALLLCTX_LOCK;
+ /* Request for size. */
+ if (!req->oldptr) {
+ error = SYSCTL_OUT(req, 0,
+ sizeof(struct kinfo_lctx) * (alllctx_cnt + 1));
+ goto out;
+ }
+ break;
+
+ case KERN_LCTX_LCID:
+ /* No space */
+ if (req->oldlen < sizeof(struct kinfo_lctx))
+ return (ENOMEM);
+ /* No argument */
+ if (namelen != 1)
+ return (EINVAL);
+ /* No login context */
+ l = lcfind((pid_t)name[0]);
+ if (l == NULL)
+ return (ENOENT);
+ kil.id = l->lc_id;
+ kil.mc = l->lc_mc;
+ LCTX_UNLOCK(l);
+ return (SYSCTL_OUT(req, (caddr_t)&kil, sizeof(kil)));
+
+ default:
+ return (EINVAL);
+ }
+
+ /* Provided buffer is too small. */
+ if (req->oldlen < (sizeof(struct kinfo_lctx) * alllctx_cnt)) {
+ error = ENOMEM;
+ goto out;
+ }
+
+ LIST_FOREACH(l, &alllctx, lc_list) {
+ LCTX_LOCK(l);
+ kil.id = l->lc_id;
+ kil.mc = l->lc_mc;
+ LCTX_UNLOCK(l);
+ error = SYSCTL_OUT(req, (caddr_t)&kil, sizeof(kil));
+ if (error)
+ break;
+ }
+out:
+ ALLLCTX_UNLOCK;
+
+ return (error);
+}
+
+SYSCTL_NODE(_kern, KERN_LCTX, lctx, CTLFLAG_RW|CTLFLAG_LOCKED, 0, "Login Context");
+
+SYSCTL_PROC(_kern_lctx, KERN_LCTX_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT | CTLFLAG_LOCKED,
+ 0, 0, sysctl_kern_lctx, "S,lctx",
+ "Return entire login context table");
+SYSCTL_NODE(_kern_lctx, KERN_LCTX_LCID, lcid, CTLFLAG_RD | CTLFLAG_LOCKED,
+ sysctl_kern_lctx, "Login Context Table");
+SYSCTL_INT(_kern_lctx, OID_AUTO, last, CTLFLAG_RD | CTLFLAG_LOCKED, &lastlcid, 0, "");
+SYSCTL_INT(_kern_lctx, OID_AUTO, count, CTLFLAG_RD | CTLFLAG_LOCKED, &alllctx_cnt, 0, "");
+SYSCTL_INT(_kern_lctx, OID_AUTO, max, CTLFLAG_RW | CTLFLAG_LOCKED, &maxlcid, 0, "");
+
+#endif /* LCTX */
+
+/* Code Signing related routines */
+
+int
+csops(__unused proc_t p, struct csops_args *uap, __unused int32_t *retval)
+{
+ int ops = uap->ops;
+ pid_t pid = uap->pid;
+ user_addr_t uaddr = uap->useraddr;
+ size_t usize = (size_t)CAST_DOWN(size_t, uap->usersize);
+ proc_t pt;
+ uint32_t retflags;
+ int vid, forself;
+ int error;
+ vnode_t tvp;
+ off_t toff;
+ char * buf;
+ unsigned char cdhash[SHA1_RESULTLEN];
+
+ forself = error = 0;
+
+ if (pid == 0)
+ pid = proc_selfpid();
+ if (pid == proc_selfpid())
+ forself = 1;
+
+
+ /* Pre flight checks for CS_OPS_PIDPATH */
+ if (ops == CS_OPS_PIDPATH) {
+ /* usize is unsigned.. */
+ if (usize > 4 * PATH_MAX)
+ return(EOVERFLOW);
+ if (kauth_cred_issuser(kauth_cred_get()) != TRUE)
+ return(EPERM);
+ } else if ((forself == 0) && ((ops != CS_OPS_STATUS) && (ops != CS_OPS_CDHASH) && (ops != CS_OPS_PIDOFFSET) && (kauth_cred_issuser(kauth_cred_get()) != TRUE))) {
+ return(EPERM);
+ }
+
+ pt = proc_find(pid);
+ if (pt == PROC_NULL)
+ return(ESRCH);
+
+
+
+ switch (ops) {
+
+ case CS_OPS_STATUS:
+ retflags = pt->p_csflags;
+ if (uaddr != USER_ADDR_NULL)
+ error = copyout(&retflags, uaddr, sizeof(uint32_t));
+ break;
+
+ case CS_OPS_MARKINVALID:
+ proc_lock(pt);
+ if ((pt->p_csflags & CS_VALID) == CS_VALID) { /* is currently valid */
+ pt->p_csflags &= ~CS_VALID; /* set invalid */
+ if ((pt->p_csflags & CS_KILL) == CS_KILL) {
+ pt->p_csflags |= CS_KILLED;
+ proc_unlock(pt);
+ if (cs_debug) {
+ printf("CODE SIGNING: marked invalid by pid %d: "
+ "p=%d[%s] honoring CS_KILL, final status 0x%x\n",
+ proc_selfpid(), pt->p_pid, pt->p_comm, pt->p_csflags);
+ }
+ psignal(pt, SIGKILL);
+ } else
+ proc_unlock(pt);
+ } else
+ proc_unlock(pt);
+
+ break;
+
+ case CS_OPS_MARKHARD:
+ proc_lock(pt);
+ pt->p_csflags |= CS_HARD;
+ if ((pt->p_csflags & CS_VALID) == 0) {
+ /* @@@ allow? reject? kill? @@@ */
+ proc_unlock(pt);
+ error = EINVAL;
+ goto out;
+ } else
+ proc_unlock(pt);
+ break;
+
+ case CS_OPS_MARKKILL:
+ proc_lock(pt);
+ pt->p_csflags |= CS_KILL;
+ if ((pt->p_csflags & CS_VALID) == 0) {
+ proc_unlock(pt);
+ psignal(pt, SIGKILL);
+ } else
+ proc_unlock(pt);
+ break;
+
+ case CS_OPS_PIDPATH:
+ tvp = pt->p_textvp;
+ vid = vnode_vid(tvp);
+
+ if (tvp == NULLVP) {
+ proc_rele(pt);
+ return(EINVAL);
+ }
+
+ buf = (char *)kalloc(usize);
+ if (buf == NULL) {
+ proc_rele(pt);
+ return(ENOMEM);
+ }
+ bzero(buf, usize);
+
+ error = vnode_getwithvid(tvp, vid);
+ if (error == 0) {
+ int len;
+ len = usize;
+ error = vn_getpath(tvp, buf, &len);
+ vnode_put(tvp);
+ if (error == 0) {
+ error = copyout(buf, uaddr, usize);
+ }
+ kfree(buf, usize);
+ }
+
+ proc_rele(pt);
+
+ return(error);
+
+ case CS_OPS_PIDOFFSET:
+ toff = pt->p_textoff;
+ proc_rele(pt);
+ error = copyout(&toff, uaddr, sizeof(toff));
+ return(error);
+
+ case CS_OPS_CDHASH:
+
+ /* pt already holds a reference on its p_textvp */
+ tvp = pt->p_textvp;
+ toff = pt->p_textoff;
+
+ if (tvp == NULLVP || usize != SHA1_RESULTLEN) {
+ proc_rele(pt);
+ return EINVAL;
+ }
+
+ error = vn_getcdhash(tvp, toff, cdhash);
+ proc_rele(pt);
+
+ if (error == 0) {
+ error = copyout(cdhash, uaddr, sizeof (cdhash));
+ }
+
+ return error;
+
+ case CS_OPS_ENTITLEMENTS_BLOB: {
+ char zeros[8] = { 0 };
+ void *start;
+ size_t length;
+
+ if (0 != (error = cs_entitlements_blob_get(pt,
+ &start, &length)))
+ break;
+ if (usize < sizeof(zeros) || usize < length) {
+ error = ERANGE;
+ break;
+ }
+ if (NULL == start) {
+ start = zeros;
+ length = sizeof(zeros);
+ }
+ error = copyout(start, uaddr, length);
+ break;
+ }
+
+ case CS_OPS_MARKRESTRICT:
+ proc_lock(pt);
+ pt->p_csflags |= CS_RESTRICT;
+ proc_unlock(pt);
+ break;
+
+ default:
+ error = EINVAL;
+ break;
+ }
+out:
+ proc_rele(pt);
+ return(error);
+}
+
+
+int
+proc_iterate(flags, callout, arg, filterfn, filterarg)
+ int flags;
+ int (*callout)(proc_t, void *);
+ void * arg;
+ int (*filterfn)(proc_t, void *);
+ void * filterarg;
+{
+ proc_t p;
+ pid_t * pid_list;
+ int count, pidcount, alloc_count, i, retval;
+
+ count = nprocs+ 10;
+ if (count > hard_maxproc)
+ count = hard_maxproc;
+ alloc_count = count * sizeof(pid_t);
+ pid_list = (pid_t *)kalloc(alloc_count);
+ bzero(pid_list, alloc_count);
+
+
+ proc_list_lock();
+
+
+ pidcount = 0;
+ if (flags & PROC_ALLPROCLIST) {
+ for (p = allproc.lh_first; (p != 0); p = p->p_list.le_next) {
+ if (p->p_stat == SIDL)
+ continue;
+ if ( (filterfn == 0 ) || (filterfn(p, filterarg) != 0)) {
+ pid_list[pidcount] = p->p_pid;
+ pidcount++;
+ if (pidcount >= count)
+ break;
+ }
+ }
+ }
+ if ((pidcount < count ) && (flags & PROC_ZOMBPROCLIST)) {
+ for (p = zombproc.lh_first; p != 0; p = p->p_list.le_next) {
+ if ( (filterfn == 0 ) || (filterfn(p, filterarg) != 0)) {
+ pid_list[pidcount] = p->p_pid;
+ pidcount++;
+ if (pidcount >= count)
+ break;
+ }
+ }
+ }
+
+
+ proc_list_unlock();
+
+
+ for (i = 0; i< pidcount; i++) {
+ p = proc_find(pid_list[i]);
+ if (p) {
+ if ((flags & PROC_NOWAITTRANS) == 0)
+ proc_transwait(p, 0);
+ retval = callout(p, arg);
+
+ switch (retval) {
+ case PROC_RETURNED:
+ case PROC_RETURNED_DONE:
+ proc_rele(p);
+ if (retval == PROC_RETURNED_DONE) {
+ goto out;
+ }
+ break;
+
+ case PROC_CLAIMED_DONE:
+ goto out;
+ case PROC_CLAIMED:
+ default:
+ break;
+ }
+ } else if (flags & PROC_ZOMBPROCLIST) {
+ p = proc_find_zombref(pid_list[i]);
+ if (p != PROC_NULL) {
+ retval = callout(p, arg);
+
+ switch (retval) {
+ case PROC_RETURNED:
+ case PROC_RETURNED_DONE:
+ proc_drop_zombref(p);
+ if (retval == PROC_RETURNED_DONE) {
+ goto out;
+ }
+ break;
+
+ case PROC_CLAIMED_DONE:
+ goto out;
+ case PROC_CLAIMED:
+ default:
+ break;
+ }
+ }
+ }
+ }
+
+out:
+ kfree(pid_list, alloc_count);
+ return(0);
+
+}
+
+
+#if 0
+/* This is for iteration in case of trivial non blocking callouts */
+int
+proc_scanall(flags, callout, arg)
+ int flags;
+ int (*callout)(proc_t, void *);
+ void * arg;
+{
+ proc_t p;
+ int retval;
+
+
+ proc_list_lock();
+
+
+ if (flags & PROC_ALLPROCLIST) {
+ for (p = allproc.lh_first; (p != 0); p = p->p_list.le_next) {
+ retval = callout(p, arg);
+ if (retval == PROC_RETURNED_DONE)
+ goto out;
+ }
+ }
+ if (flags & PROC_ZOMBPROCLIST) {
+ for (p = zombproc.lh_first; p != 0; p = p->p_list.le_next) {
+ retval = callout(p, arg);
+ if (retval == PROC_RETURNED_DONE)
+ goto out;
+ }
+ }
+out:
+
+ proc_list_unlock();
+
+ return(0);
+}
+#endif
+
+
+int
+proc_rebootscan(callout, arg, filterfn, filterarg)
+ int (*callout)(proc_t, void *);
+ void * arg;
+ int (*filterfn)(proc_t, void *);
+ void * filterarg;
+{
+ proc_t p;
+ int lockheld = 0, retval;
+
+ proc_shutdown_exitcount = 0;
+
+ps_allprocscan:
+
+ proc_list_lock();
+
+ lockheld = 1;
+
+ for (p = allproc.lh_first; (p != 0); p = p->p_list.le_next) {
+ if ( (filterfn == 0 ) || (filterfn(p, filterarg) != 0)) {
+ p = proc_ref_locked(p);
+
+ proc_list_unlock();
+ lockheld = 0;
+
+ if (p) {
+ proc_transwait(p, 0);
+ retval = callout(p, arg);
+ proc_rele(p);
+
+ switch (retval) {
+ case PROC_RETURNED_DONE:
+ case PROC_CLAIMED_DONE:
+ goto out;
+ }
+ }
+ goto ps_allprocscan;
+ } /* filter pass */
+ } /* allproc walk thru */
+
+ if (lockheld == 1) {
+ proc_list_unlock();
+ lockheld = 0;
+ }
+
+out:
+ return(0);
+
+}
+
+
+int
+proc_childrenwalk(parent, callout, arg)
+ struct proc * parent;
+ int (*callout)(proc_t, void *);
+ void * arg;
+{
+ register struct proc *p;
+ pid_t * pid_list;
+ int count, pidcount, alloc_count, i, retval;
+
+ count = nprocs+ 10;
+ if (count > hard_maxproc)
+ count = hard_maxproc;
+ alloc_count = count * sizeof(pid_t);
+ pid_list = (pid_t *)kalloc(alloc_count);
+ bzero(pid_list, alloc_count);
+
+
+ proc_list_lock();
+
+
+ pidcount = 0;
+ for (p = parent->p_children.lh_first; (p != 0); p = p->p_sibling.le_next) {
+ if (p->p_stat == SIDL)
+ continue;
+ pid_list[pidcount] = p->p_pid;
+ pidcount++;
+ if (pidcount >= count)
+ break;
+ }
+ proc_list_unlock();
+
+
+ for (i = 0; i< pidcount; i++) {
+ p = proc_find(pid_list[i]);
+ if (p) {
+ proc_transwait(p, 0);
+ retval = callout(p, arg);
+
+ switch (retval) {
+ case PROC_RETURNED:
+ case PROC_RETURNED_DONE:
+ proc_rele(p);
+ if (retval == PROC_RETURNED_DONE) {
+ goto out;
+ }
+ break;
+
+ case PROC_CLAIMED_DONE:
+ goto out;
+ case PROC_CLAIMED:
+ default:
+ break;
+ }
+ }
+ }
+
+out:
+ kfree(pid_list, alloc_count);
+ return(0);
+
+}
+
+/*
+ */
+/* PGRP_BLOCKITERATE is not implemented yet */
+int
+pgrp_iterate(pgrp, flags, callout, arg, filterfn, filterarg)
+ struct pgrp *pgrp;
+ int flags;
+ int (*callout)(proc_t, void *);
+ void * arg;
+ int (*filterfn)(proc_t, void *);
+ void * filterarg;
+{
+ proc_t p;
+ pid_t * pid_list;
+ int count, pidcount, i, alloc_count;
+ int retval;
+ pid_t pgid;
+ int dropref = flags & PGRP_DROPREF;
+#if 0
+ int serialize = flags & PGRP_BLOCKITERATE;
+#else
+ int serialize = 0;
+#endif
+
+ if (pgrp == 0)
+ return(0);
+ count = pgrp->pg_membercnt + 10;
+ if (count > hard_maxproc)
+ count = hard_maxproc;
+ alloc_count = count * sizeof(pid_t);
+ pid_list = (pid_t *)kalloc(alloc_count);
+ bzero(pid_list, alloc_count);
+
+ pgrp_lock(pgrp);
+ if (serialize != 0) {
+ while ((pgrp->pg_listflags & PGRP_FLAG_ITERABEGIN) == PGRP_FLAG_ITERABEGIN) {
+ pgrp->pg_listflags |= PGRP_FLAG_ITERWAIT;
+ msleep(&pgrp->pg_listflags, &pgrp->pg_mlock, 0, "pgrp_iterate", 0);
+ }
+ pgrp->pg_listflags |= PGRP_FLAG_ITERABEGIN;
+ }
+
+ pgid = pgrp->pg_id;
+
+ pidcount = 0;
+ for (p = pgrp->pg_members.lh_first; p != 0;
+ p = p->p_pglist.le_next) {
+ if ( (filterfn == 0 ) || (filterfn(p, filterarg) != 0)) {
+ pid_list[pidcount] = p->p_pid;
+ pidcount++;
+ if (pidcount >= count)
+ break;
+ }
+ }
+
+
+ pgrp_unlock(pgrp);
+ if ((serialize == 0) && (dropref != 0))
+ pg_rele(pgrp);
+
+
+ for (i = 0; i< pidcount; i++) {
+ /* No handling or proc0 */
+ if (pid_list[i] == 0)
+ continue;
+ p = proc_find(pid_list[i]);
+ if (p) {
+ if (p->p_pgrpid != pgid) {
+ proc_rele(p);
+ continue;
+ }
+ proc_transwait(p, 0);
+ retval = callout(p, arg);
+
+ switch (retval) {
+ case PROC_RETURNED:
+ case PROC_RETURNED_DONE:
+ proc_rele(p);
+ if (retval == PROC_RETURNED_DONE) {
+ goto out;
+ }
+ break;
+
+ case PROC_CLAIMED_DONE:
+ goto out;
+ case PROC_CLAIMED:
+ default:
+ break;
+ }
+ }
+ }
+out:
+ if (serialize != 0) {
+ pgrp_lock(pgrp);
+ pgrp->pg_listflags &= ~PGRP_FLAG_ITERABEGIN;
+ if ((pgrp->pg_listflags & PGRP_FLAG_ITERWAIT) == PGRP_FLAG_ITERWAIT) {
+ pgrp->pg_listflags &= ~PGRP_FLAG_ITERWAIT;
+ wakeup(&pgrp->pg_listflags);
+ }
+ pgrp_unlock(pgrp);
+ if (dropref != 0)
+ pg_rele(pgrp);
+ }
+ kfree(pid_list, alloc_count);
+ return(0);
+}
+
+static void
+pgrp_add(struct pgrp * pgrp, struct proc * parent, struct proc * child)
+{
+ proc_list_lock();
+ child->p_pgrp = pgrp;
+ child->p_pgrpid = pgrp->pg_id;
+ child->p_listflag |= P_LIST_INPGRP;
+ /*
+ * When pgrp is being freed , a process can still
+ * request addition using setpgid from bash when
+ * login is terminated (login cycler) return ESRCH
+ * Safe to hold lock due to refcount on pgrp
+ */
+ if ((pgrp->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) {
+ pgrp->pg_listflags &= ~PGRP_FLAG_TERMINATE;
+ }
+
+ if ((pgrp->pg_listflags & PGRP_FLAG_DEAD) == PGRP_FLAG_DEAD)
+ panic("pgrp_add : pgrp is dead adding process");
+ proc_list_unlock();
+
+ pgrp_lock(pgrp);
+ pgrp->pg_membercnt++;
+ if ( parent != PROC_NULL) {
+ LIST_INSERT_AFTER(parent, child, p_pglist);
+ }else {
+ LIST_INSERT_HEAD(&pgrp->pg_members, child, p_pglist);
+ }
+ pgrp_unlock(pgrp);
+
+ proc_list_lock();
+ if (((pgrp->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) && (pgrp->pg_membercnt != 0)) {
+ pgrp->pg_listflags &= ~PGRP_FLAG_TERMINATE;
+ }
+ proc_list_unlock();
+}
+
+static void
+pgrp_remove(struct proc * p)
+{
+ struct pgrp * pg;
+
+ pg = proc_pgrp(p);
+
+ proc_list_lock();
+#if __PROC_INTERNAL_DEBUG
+ if ((p->p_listflag & P_LIST_INPGRP) == 0)
+ panic("removing from pglist but no named ref\n");
+#endif
+ p->p_pgrpid = PGRPID_DEAD;
+ p->p_listflag &= ~P_LIST_INPGRP;
+ p->p_pgrp = NULL;
+ proc_list_unlock();
+
+ if (pg == PGRP_NULL)
+ panic("pgrp_remove: pg is NULL");
+ pgrp_lock(pg);
+ pg->pg_membercnt--;
+
+ if (pg->pg_membercnt < 0)
+ panic("pgprp: -ve membercnt pgprp:%p p:%p\n",pg, p);
+
+ LIST_REMOVE(p, p_pglist);
+ if (pg->pg_members.lh_first == 0) {
+ pgrp_unlock(pg);
+ pgdelete_dropref(pg);
+ } else {
+ pgrp_unlock(pg);
+ pg_rele(pg);
+ }
+}
+
+
+/* cannot use proc_pgrp as it maybe stalled */
+static void
+pgrp_replace(struct proc * p, struct pgrp * newpg)
+{
+ struct pgrp * oldpg;
+
+
+
+ proc_list_lock();
+
+ while ((p->p_listflag & P_LIST_PGRPTRANS) == P_LIST_PGRPTRANS) {
+ p->p_listflag |= P_LIST_PGRPTRWAIT;
+ (void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0);
+ }
+
+ p->p_listflag |= P_LIST_PGRPTRANS;
+
+ oldpg = p->p_pgrp;
+ if (oldpg == PGRP_NULL)
+ panic("pgrp_replace: oldpg NULL");
+ oldpg->pg_refcount++;
+#if __PROC_INTERNAL_DEBUG
+ if ((p->p_listflag & P_LIST_INPGRP) == 0)
+ panic("removing from pglist but no named ref\n");
+#endif
+ p->p_pgrpid = PGRPID_DEAD;
+ p->p_listflag &= ~P_LIST_INPGRP;
+ p->p_pgrp = NULL;
+
+ proc_list_unlock();
+
+ pgrp_lock(oldpg);
+ oldpg->pg_membercnt--;
+ if (oldpg->pg_membercnt < 0)
+ panic("pgprp: -ve membercnt pgprp:%p p:%p\n",oldpg, p);
+ LIST_REMOVE(p, p_pglist);
+ if (oldpg->pg_members.lh_first == 0) {
+ pgrp_unlock(oldpg);
+ pgdelete_dropref(oldpg);
+ } else {
+ pgrp_unlock(oldpg);
+ pg_rele(oldpg);
+ }
+
+ proc_list_lock();
+ p->p_pgrp = newpg;
+ p->p_pgrpid = newpg->pg_id;
+ p->p_listflag |= P_LIST_INPGRP;
+ /*
+ * When pgrp is being freed , a process can still
+ * request addition using setpgid from bash when
+ * login is terminated (login cycler) return ESRCH
+ * Safe to hold lock due to refcount on pgrp
+ */
+ if ((newpg->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) {
+ newpg->pg_listflags &= ~PGRP_FLAG_TERMINATE;
+ }
+
+ if ((newpg->pg_listflags & PGRP_FLAG_DEAD) == PGRP_FLAG_DEAD)
+ panic("pgrp_add : pgrp is dead adding process");
+ proc_list_unlock();
+
+ pgrp_lock(newpg);
+ newpg->pg_membercnt++;
+ LIST_INSERT_HEAD(&newpg->pg_members, p, p_pglist);
+ pgrp_unlock(newpg);
+
+ proc_list_lock();
+ if (((newpg->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) == PGRP_FLAG_TERMINATE) && (newpg->pg_membercnt != 0)) {
+ newpg->pg_listflags &= ~PGRP_FLAG_TERMINATE;
+ }
+
+ p->p_listflag &= ~P_LIST_PGRPTRANS;
+ if ((p->p_listflag & P_LIST_PGRPTRWAIT) == P_LIST_PGRPTRWAIT) {
+ p->p_listflag &= ~P_LIST_PGRPTRWAIT;
+ wakeup(&p->p_pgrpid);
+
+ }
+ proc_list_unlock();
+}
+
+void
+pgrp_lock(struct pgrp * pgrp)
+{
+ lck_mtx_lock(&pgrp->pg_mlock);
+}
+
+void
+pgrp_unlock(struct pgrp * pgrp)
+{
+ lck_mtx_unlock(&pgrp->pg_mlock);
+}
+
+void
+session_lock(struct session * sess)
+{
+ lck_mtx_lock(&sess->s_mlock);
+}
+
+
+void
+session_unlock(struct session * sess)
+{
+ lck_mtx_unlock(&sess->s_mlock);
+}
+
+struct pgrp *
+proc_pgrp(proc_t p)
+{
+ struct pgrp * pgrp;
+
+ if (p == PROC_NULL)
+ return(PGRP_NULL);
+ proc_list_lock();
+
+ while ((p->p_listflag & P_LIST_PGRPTRANS) == P_LIST_PGRPTRANS) {
+ p->p_listflag |= P_LIST_PGRPTRWAIT;
+ (void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0);
+ }
+
+ pgrp = p->p_pgrp;
+
+ assert(pgrp != NULL);
+
+ if (pgrp != PGRP_NULL) {
+ pgrp->pg_refcount++;
+ if ((pgrp->pg_listflags & (PGRP_FLAG_TERMINATE | PGRP_FLAG_DEAD)) != 0)
+ panic("proc_pgrp: ref being povided for dead pgrp");
+ }
+
+ proc_list_unlock();
+
+ return(pgrp);
+}
+
+struct pgrp *
+tty_pgrp(struct tty * tp)
+{
+ struct pgrp * pg = PGRP_NULL;
+
+ proc_list_lock();
+ pg = tp->t_pgrp;
+
+ if (pg != PGRP_NULL) {
+ if ((pg->pg_listflags & PGRP_FLAG_DEAD) != 0)
+ panic("tty_pgrp: ref being povided for dead pgrp");
+ pg->pg_refcount++;
+ }
+ proc_list_unlock();
+
+ return(pg);
+}
+
+struct session *
+proc_session(proc_t p)
+{
+ struct session * sess = SESSION_NULL;
+
+ if (p == PROC_NULL)
+ return(SESSION_NULL);
+
+ proc_list_lock();
+
+ /* wait during transitions */
+ while ((p->p_listflag & P_LIST_PGRPTRANS) == P_LIST_PGRPTRANS) {
+ p->p_listflag |= P_LIST_PGRPTRWAIT;
+ (void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0);
+ }
+
+ if ((p->p_pgrp != PGRP_NULL) && ((sess = p->p_pgrp->pg_session) != SESSION_NULL)) {
+ if ((sess->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0)
+ panic("proc_session:returning sesssion ref on terminating session");
+ sess->s_count++;
+ }
+ proc_list_unlock();
+ return(sess);
+}
+
+void
+session_rele(struct session *sess)
+{
+ proc_list_lock();
+ if (--sess->s_count == 0) {
+ if ((sess->s_listflags & (S_LIST_TERM | S_LIST_DEAD)) != 0)
+ panic("session_rele: terminating already terminated session");
+ sess->s_listflags |= S_LIST_TERM;
+ LIST_REMOVE(sess, s_hash);
+ sess->s_listflags |= S_LIST_DEAD;
+ if (sess->s_count != 0)
+ panic("session_rele: freeing session in use");
+ proc_list_unlock();
+#if CONFIG_FINE_LOCK_GROUPS
+ lck_mtx_destroy(&sess->s_mlock, proc_mlock_grp);
+#else
+ lck_mtx_destroy(&sess->s_mlock, proc_lck_grp);
+#endif
+ FREE_ZONE(sess, sizeof(struct session), M_SESSION);
+ } else
+ proc_list_unlock();
+}
+
+int
+proc_transstart(proc_t p, int locked)
+{
+ if (locked == 0)
+ proc_lock(p);
+ while ((p->p_lflag & P_LINTRANSIT) == P_LINTRANSIT) {
+ if ((p->p_lflag & P_LTRANSCOMMIT) == P_LTRANSCOMMIT) {
+ if (locked == 0)
+ proc_unlock(p);
+ return EDEADLK;
+ }
+ p->p_lflag |= P_LTRANSWAIT;
+ msleep(&p->p_lflag, &p->p_mlock, 0, "proc_signstart", NULL);
+ }
+ p->p_lflag |= P_LINTRANSIT;
+ p->p_transholder = current_thread();
+ if (locked == 0)
+ proc_unlock(p);
+ return 0;
+}
+
+void
+proc_transcommit(proc_t p, int locked)
+{
+ if (locked == 0)
+ proc_lock(p);
+
+ assert ((p->p_lflag & P_LINTRANSIT) == P_LINTRANSIT);
+ assert (p->p_transholder == current_thread());
+ p->p_lflag |= P_LTRANSCOMMIT;
+
+ if ((p->p_lflag & P_LTRANSWAIT) == P_LTRANSWAIT) {
+ p->p_lflag &= ~P_LTRANSWAIT;
+ wakeup(&p->p_lflag);
+ }
+ if (locked == 0)
+ proc_unlock(p);
+}
+
+void
+proc_transend(proc_t p, int locked)
+{
+ if (locked == 0)
+ proc_lock(p);
+
+ p->p_lflag &= ~( P_LINTRANSIT | P_LTRANSCOMMIT);
+ p->p_transholder = NULL;
+
+ if ((p->p_lflag & P_LTRANSWAIT) == P_LTRANSWAIT) {
+ p->p_lflag &= ~P_LTRANSWAIT;
+ wakeup(&p->p_lflag);
+ }
+ if (locked == 0)
+ proc_unlock(p);
+}
+
+int
+proc_transwait(proc_t p, int locked)
+{
+ if (locked == 0)
+ proc_lock(p);
+ while ((p->p_lflag & P_LINTRANSIT) == P_LINTRANSIT) {
+ if ((p->p_lflag & P_LTRANSCOMMIT) == P_LTRANSCOMMIT && current_proc() == p) {
+ if (locked == 0)
+ proc_unlock(p);
+ return EDEADLK;
+ }
+ p->p_lflag |= P_LTRANSWAIT;
+ msleep(&p->p_lflag, &p->p_mlock, 0, "proc_signstart", NULL);
+ }
+ if (locked == 0)
+ proc_unlock(p);
+ return 0;
+}
+
+void
+proc_klist_lock(void)
+{
+ lck_mtx_lock(proc_klist_mlock);
+}
+
+void
+proc_klist_unlock(void)
+{
+ lck_mtx_unlock(proc_klist_mlock);
+}
+
+void
+proc_knote(struct proc * p, long hint)
+{
+ proc_klist_lock();
+ KNOTE(&p->p_klist, hint);
+ proc_klist_unlock();
+}
+
+void
+proc_knote_drain(struct proc *p)
+{
+ struct knote *kn = NULL;
+
+ /*
+ * Clear the proc's klist to avoid references after the proc is reaped.
+ */
+ proc_klist_lock();
+ while ((kn = SLIST_FIRST(&p->p_klist))) {
+ kn->kn_ptr.p_proc = PROC_NULL;
+ KNOTE_DETACH(&p->p_klist, kn);
+ }
+ proc_klist_unlock();
+}
+
+unsigned long cs_procs_killed = 0;
+unsigned long cs_procs_invalidated = 0;
+int cs_force_kill = 0;
+int cs_force_hard = 0;
+int cs_debug = 0;
+SYSCTL_INT(_vm, OID_AUTO, cs_force_kill, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_force_kill, 0, "");
+SYSCTL_INT(_vm, OID_AUTO, cs_force_hard, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_force_hard, 0, "");
+SYSCTL_INT(_vm, OID_AUTO, cs_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_debug, 0, "");
+
+int
+cs_allow_invalid(struct proc *p)
+{
+#if MACH_ASSERT
+ lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_NOTOWNED);
+#endif
+#if CONFIG_MACF && CONFIG_ENFORCE_SIGNED_CODE
+ /* There needs to be a MAC policy to implement this hook, or else the
+ * kill bits will be cleared here every time. If we have
+ * CONFIG_ENFORCE_SIGNED_CODE, we can assume there is a policy
+ * implementing the hook.
+ */
+ if( 0 != mac_proc_check_run_cs_invalid(p)) {
+ if(cs_debug) printf("CODE SIGNING: cs_allow_invalid() "
+ "not allowed: pid %d\n",
+ p->p_pid);
+ return 0;
+ }
+ if(cs_debug) printf("CODE SIGNING: cs_allow_invalid() "
+ "allowed: pid %d\n",
+ p->p_pid);
+ proc_lock(p);
+ p->p_csflags &= ~(CS_KILL | CS_HARD | CS_VALID);
+ proc_unlock(p);
+ vm_map_switch_protect(get_task_map(p->task), FALSE);
+#endif
+ return (p->p_csflags & (CS_KILL | CS_HARD)) == 0;
+}
+
+int
+cs_invalid_page(
+ addr64_t vaddr)
+{
+ struct proc *p;
+ int retval;
+
+ p = current_proc();
+
+ /*
+ * XXX revisit locking when proc is no longer protected
+ * by the kernel funnel...
+ */
+
+ /* XXX for testing */
+ proc_lock(p);
+ if (cs_force_kill)
+ p->p_csflags |= CS_KILL;
+ if (cs_force_hard)
+ p->p_csflags |= CS_HARD;
+
+ /* CS_KILL triggers us to send a kill signal. Nothing else. */
+ if (p->p_csflags & CS_KILL) {
+ p->p_csflags |= CS_KILLED;
+ proc_unlock(p);
+ if (cs_debug) {
+ printf("CODE SIGNING: cs_invalid_page(0x%llx): "
+ "p=%d[%s] honoring CS_KILL, final status 0x%x\n",
+ vaddr, p->p_pid, p->p_comm, p->p_csflags);
+ }
+ cs_procs_killed++;
+ psignal(p, SIGKILL);
+ proc_lock(p);
+ }
+
+ /* CS_HARD means fail the mapping operation so the process stays valid. */
+ if (p->p_csflags & CS_HARD) {
+ proc_unlock(p);
+ if (cs_debug) {
+ printf("CODE SIGNING: cs_invalid_page(0x%llx): "
+ "p=%d[%s] honoring CS_HARD\n",
+ vaddr, p->p_pid, p->p_comm);
+ }
+ retval = 1;
+ } else {
+ if (p->p_csflags & CS_VALID) {
+ p->p_csflags &= ~CS_VALID;
+
+ proc_unlock(p);
+ cs_procs_invalidated++;
+ printf("CODE SIGNING: cs_invalid_page(0x%llx): "
+ "p=%d[%s] clearing CS_VALID\n",
+ vaddr, p->p_pid, p->p_comm);
+ } else {
+ proc_unlock(p);
+ }
+
+ retval = 0;
+ }
+
+ return retval;
+}
+
+void
+proc_setregister(proc_t p)
+{
+ proc_lock(p);
+ p->p_lflag |= P_LREGISTER;
+ proc_unlock(p);
+}
+
+void
+proc_resetregister(proc_t p)
+{
+ proc_lock(p);
+ p->p_lflag &= ~P_LREGISTER;
+ proc_unlock(p);
+}
+
+pid_t
+proc_pgrpid(proc_t p)
+{
+ return p->p_pgrpid;
+}
+
+pid_t
+proc_selfpgrpid()
+{
+ return current_proc()->p_pgrpid;
+}
+
+
+/* return control and action states */
+int
+proc_getpcontrol(int pid, int * pcontrolp)
+{
+ proc_t p;
+
+ p = proc_find(pid);
+ if (p == PROC_NULL)
+ return(ESRCH);
+ if (pcontrolp != NULL)
+ *pcontrolp = p->p_pcaction;
+
+ proc_rele(p);
+ return(0);
+}
+
+int
+proc_dopcontrol(proc_t p, void *num_found)
+{
+ int pcontrol;
+
+ proc_lock(p);
+
+ pcontrol = PROC_CONTROL_STATE(p);
+
+ if (PROC_ACTION_STATE(p) ==0) {
+ switch(pcontrol) {
+ case P_PCTHROTTLE:
+ PROC_SETACTION_STATE(p);
+ proc_unlock(p);
+ printf("low swap: throttling pid %d (%s)\n", p->p_pid, p->p_comm);
+ (*(int *)num_found)++;
+ break;
+
+ case P_PCSUSP:
+ PROC_SETACTION_STATE(p);
+ proc_unlock(p);
+ printf("low swap: suspending pid %d (%s)\n", p->p_pid, p->p_comm);
+ task_suspend(p->task);
+ (*(int *)num_found)++;
+ break;
+
+ case P_PCKILL:
+ PROC_SETACTION_STATE(p);
+ proc_unlock(p);
+ printf("low swap: killing pid %d (%s)\n", p->p_pid, p->p_comm);
+ psignal(p, SIGKILL);
+ (*(int *)num_found)++;
+ break;
+
+ default:
+ proc_unlock(p);
+ }
+
+ } else
+ proc_unlock(p);
+
+ return(PROC_RETURNED);
+}
+
+
+/*
+ * Resume a throttled or suspended process. This is an internal interface that's only
+ * used by the user level code that presents the GUI when we run out of swap space and
+ * hence is restricted to processes with superuser privileges.
+ */
+
+int
+proc_resetpcontrol(int pid)
+{
+ proc_t p;
+ int pcontrol;
+ int error;
+ proc_t self = current_proc();
+
+ /* if the process has been validated to handle resource control or root is valid one */
+ if (((self->p_lflag & P_LVMRSRCOWNER) == 0) && (error = suser(kauth_cred_get(), 0)))
+ return error;
+
+ p = proc_find(pid);
+ if (p == PROC_NULL)
+ return(ESRCH);
+
+ proc_lock(p);
+
+ pcontrol = PROC_CONTROL_STATE(p);
+
+ if(PROC_ACTION_STATE(p) !=0) {
+ switch(pcontrol) {
+ case P_PCTHROTTLE:
+ PROC_RESETACTION_STATE(p);
+ proc_unlock(p);
+ printf("low swap: unthrottling pid %d (%s)\n", p->p_pid, p->p_comm);
+ break;
+
+ case P_PCSUSP:
+ PROC_RESETACTION_STATE(p);
+ proc_unlock(p);
+ printf("low swap: resuming pid %d (%s)\n", p->p_pid, p->p_comm);
+ task_resume(p->task);
+ break;
+
+ case P_PCKILL:
+ /* Huh? */
+ PROC_SETACTION_STATE(p);
+ proc_unlock(p);
+ printf("low swap: attempt to unkill pid %d (%s) ignored\n", p->p_pid, p->p_comm);
+ break;
+
+ default:
+ proc_unlock(p);
+ }
+
+ } else
+ proc_unlock(p);
+
+ proc_rele(p);
+ return(0);
+}
+
+
+/*
+ * Return true if the specified process has an action state specified for it and it isn't
+ * already in an action state and it's using more physical memory than the specified threshold.
+ * Note: the memory_threshold argument is specified in bytes and is of type uint64_t.
+ */
+
+static int
+proc_pcontrol_filter(proc_t p, void *memory_thresholdp)
+{
+
+ return PROC_CONTROL_STATE(p) && /* if there's an action state specified... */
+ (PROC_ACTION_STATE(p) == 0) && /* and we're not in the action state yet... */
+ (get_task_resident_size(p->task) > *((uint64_t *)memory_thresholdp)); /* and this proc is over the mem threshold, */
+ /* then return true to take action on this proc */
+}
+
+
+
+/*
+ * Deal with the out of swap space condition. This routine gets called when
+ * we want to swap something out but there's no more space left. Since this
+ * creates a memory deadlock situtation, we need to take action to free up
+ * some memory resources in order to prevent the system from hanging completely.
+ * The action we take is based on what the system processes running at user level
+ * have specified. Processes are marked in one of four categories: ones that
+ * can be killed immediately, ones that should be suspended, ones that should
+ * be throttled, and all the rest which are basically none of the above. Which
+ * processes are marked as being in which category is a user level policy decision;
+ * we just take action based on those decisions here.
+ */
+
+#define STARTING_PERCENTAGE 50 /* memory threshold expressed as a percentage */
+ /* of physical memory */
+
+struct timeval last_no_space_action = {0, 0};
+
+void
+no_paging_space_action(void)
+{
+
+ uint64_t memory_threshold;
+ int num_found;
+ struct timeval now;
+
+ /*
+ * Throttle how often we come through here. Once every 20 seconds should be plenty.
+ */
+
+ microtime(&now);
+
+ if (now.tv_sec <= last_no_space_action.tv_sec + 20)
+ return;
+
+ last_no_space_action = now;
+
+ /*
+ * Examine all processes and find those that have been marked to have some action
+ * taken when swap space runs out. Of those processes, select one or more and
+ * apply the specified action to them. The idea is to only take action against
+ * a few processes rather than hitting too many at once. If the low swap condition
+ * persists, this routine will get called again and we'll take action against more
+ * processes.
+ *
+ * Of the processes that have been marked, we choose which ones to take action
+ * against according to how much physical memory they're presently using. We
+ * start with the STARTING_THRESHOLD and any processes using more physical memory
+ * than the percentage threshold will have action taken against it. If there
+ * are no processes over the threshold, then the threshold is cut in half and we
+ * look again for processes using more than this threshold. We continue in
+ * this fashion until we find at least one process to take action against. This
+ * iterative approach is less than ideally efficient, however we only get here
+ * when the system is almost in a memory deadlock and is pretty much just
+ * thrashing if it's doing anything at all. Therefore, the cpu overhead of
+ * potentially multiple passes here probably isn't revelant.
+ */
+
+ memory_threshold = (sane_size * STARTING_PERCENTAGE) / 100; /* resident threshold in bytes */
+
+ for (num_found = 0; num_found == 0; memory_threshold = memory_threshold / 2) {
+ proc_iterate(PROC_ALLPROCLIST, proc_dopcontrol, (void *)&num_found, proc_pcontrol_filter, (void *)&memory_threshold);
+
+ /*
+ * If we just looked with memory_threshold == 0, then there's no need to iterate any further since
+ * we won't find any eligible processes at this point.
+ */
+
+ if (memory_threshold == 0) {
+ if (num_found == 0) /* log that we couldn't do anything in this case */
+ printf("low swap: unable to find any eligible processes to take action on\n");
+
+ break;
+ }
+ }
}
projects / apple / xnu.git / blobdiff