/* copy the page tables, and set both pte's flag.
* note: on Copy On Write, both parent and child process will be marked
* write-protected, and increase the reference count of each shared physical
* page.
* */
int pt_copy(struct pde *npgd, struct pde *opgd){
struct pde *opde, *npde;
struct pte *opte, *npte, *old_pt, *new_pt;
struct page *pg;
uint pdn, pn;
for(pdn=PDX(KMEM_END); pdn<1024; pdn++) {
opde = &opgd[pdn];
npde = &npgd[pdn];
npde->pd_flag = opde->pd_flag;
if (opde->pd_flag & PTE_P) {
old_pt = (struct pte*)(opde->pd_off * PAGE);
new_pt = (struct pte*)kmalloc(PAGE);
npde->pd_off = PPN(new_pt);
for(pn=0; pn<1024; pn++){
opte = &old_pt[pn];
npte = &new_pt[pn];
npte->pt_off = opte->pt_off;
npte->pt_flag = opte->pt_flag;
if (opte->pt_flag & PTE_P) {
// turn off each pte's PTE_W
npte->pt_flag &= ~PTE_W;
opte->pt_flag &= ~PTE_W;
// increase the ref count
pg = pgfind(opte->pt_off);
pg->pg_count++;
}
}
}
}
return 0;
}
/*
* set process group (setpgid/old setpgrp)
*
* caller does setpgid(targpid, targpgid)
*
* pid must be caller or child of caller (ESRCH)
* if a child
* pid must be in same session (EPERM)
* pid can't have done an exec (EACCES)
* if pgid != pid
* there must exist some pid in same session having pgid (EPERM)
* pid must not be session leader (EPERM)
*/
int
sys_setpgid(struct setpgid_args *uap)
{
struct proc *curp = curproc;
struct proc *targp; /* target process */
struct pgrp *pgrp = NULL; /* target pgrp */
int error;
if (uap->pgid < 0)
return (EINVAL);
if (uap->pid != 0 && uap->pid != curp->p_pid) {
if ((targp = pfind(uap->pid)) == NULL || !inferior(targp)) {
if (targp)
PRELE(targp);
error = ESRCH;
targp = NULL;
goto done;
}
lwkt_gettoken(&targp->p_token);
/* targp now referenced and its token is held */
if (targp->p_pgrp == NULL ||
targp->p_session != curp->p_session) {
error = EPERM;
goto done;
}
if (targp->p_flags & P_EXEC) {
error = EACCES;
goto done;
}
} else {
targp = curp;
PHOLD(targp);
lwkt_gettoken(&targp->p_token);
}
if (SESS_LEADER(targp)) {
error = EPERM;
goto done;
}
if (uap->pgid == 0) {
uap->pgid = targp->p_pid;
} else if (uap->pgid != targp->p_pid) {
if ((pgrp = pgfind(uap->pgid)) == NULL ||
pgrp->pg_session != curp->p_session) {
error = EPERM;
goto done;
}
}
error = enterpgrp(targp, uap->pgid, 0);
done:
if (pgrp)
pgrel(pgrp);
if (targp) {
lwkt_reltoken(&targp->p_token);
PRELE(targp);
}
return (error);
}
/* ARGSUSED */
int
sys_setpgid(struct proc *curp, void *v, register_t *retval)
{
struct sys_setpgid_args /* {
syscallarg(pid_t) pid;
syscallarg(int) pgid;
} */ *uap = v;
struct process *curpr = curp->p_p;
struct process *targpr; /* target process */
struct pgrp *pgrp, *newpgrp; /* target pgrp */
pid_t pid;
int pgid, error;
pid = SCARG(uap, pid);
pgid = SCARG(uap, pgid);
if (pgid < 0)
return (EINVAL);
newpgrp = pool_get(&pgrp_pool, PR_WAITOK);
if (pid != 0 && pid != curpr->ps_pid) {
if ((targpr = prfind(pid)) == 0 || !inferior(targpr, curpr)) {
error = ESRCH;
goto out;
}
if (targpr->ps_session != curpr->ps_session) {
error = EPERM;
goto out;
}
if (targpr->ps_flags & PS_EXEC) {
error = EACCES;
goto out;
}
} else
targpr = curpr;
if (SESS_LEADER(targpr)) {
error = EPERM;
goto out;
}
if (pgid == 0)
pgid = targpr->ps_pid;
else if (pgid != targpr->ps_pid)
if ((pgrp = pgfind(pgid)) == 0 ||
pgrp->pg_session != curpr->ps_session) {
error = EPERM;
goto out;
}
return (enterpgrp(targpr, pgid, newpgrp, NULL));
out:
pool_put(&pgrp_pool, newpgrp);
return (error);
}
static int
sigqkill(pid_t pid, sigsend_t *sigsend)
{
proc_t *p;
int error;
if ((uint_t)sigsend->sig >= NSIG)
return (EINVAL);
if (pid == -1) {
procset_t set;
setprocset(&set, POP_AND, P_ALL, P_MYID, P_ALL, P_MYID);
error = sigsendset(&set, sigsend);
} else if (pid > 0) {
mutex_enter(&pidlock);
if ((p = prfind(pid)) == NULL || p->p_stat == SIDL)
error = ESRCH;
else {
error = sigsendproc(p, sigsend);
if (error == 0 && sigsend->perm == 0)
error = EPERM;
}
mutex_exit(&pidlock);
} else {
int nfound = 0;
pid_t pgid;
if (pid == 0)
pgid = ttoproc(curthread)->p_pgrp;
else
pgid = -pid;
error = 0;
mutex_enter(&pidlock);
for (p = pgfind(pgid); p && !error; p = p->p_pglink) {
if (p->p_stat != SIDL) {
nfound++;
error = sigsendproc(p, sigsend);
}
}
mutex_exit(&pidlock);
if (nfound == 0)
error = ESRCH;
else if (error == 0 && sigsend->perm == 0)
error = EPERM;
}
return (error);
}
/*
* Checks for current use of a pid, either as a pid or pgid.
*/
int
pidtaken(pid_t pid)
{
struct proc *p;
if (pfind(pid) != NULL)
return (1);
if (pgfind(pid) != NULL)
return (1);
LIST_FOREACH(p, &zombproc, p_list)
if (p->p_pid == pid || p->p_pgid == pid)
return (1);
return (0);
}
int
sys_setsid(struct setsid_args *uap)
{
struct proc *p = curproc;
struct pgrp *pg = NULL;
int error;
lwkt_gettoken(&p->p_token);
if (p->p_pgid == p->p_pid || (pg = pgfind(p->p_pid)) != NULL) {
error = EPERM;
if (pg)
pgrel(pg);
} else {
enterpgrp(p, p->p_pid, 1);
uap->sysmsg_result = p->p_pid;
error = 0;
}
lwkt_reltoken(&p->p_token);
return (error);
}
/* ARGSUSED */
int
sys_setsid(struct proc *p, void *v, register_t *retval)
{
struct session *newsess;
struct pgrp *newpgrp;
struct process *pr = p->p_p;
pid_t pid = pr->ps_pid;
newsess = pool_get(&session_pool, PR_WAITOK);
newpgrp = pool_get(&pgrp_pool, PR_WAITOK);
if (pr->ps_pgid == pid || pgfind(pid)) {
pool_put(&pgrp_pool, newpgrp);
pool_put(&session_pool, newsess);
return (EPERM);
} else {
(void) enterpgrp(pr, pid, newpgrp, newsess);
*retval = pid;
return (0);
}
}
/* decrease all the pages' reference count, and free the page tables. */
int pt_free(struct pde *pgd){
struct pde *pde;
struct pte *pte, *pt;
struct page *pg;
uint pdn, pn;
for(pdn=PDX(KMEM_END); pdn<1024; pdn++) {
pde = &pgd[pdn];
if (pde->pd_flag & PTE_P) {
pt = (struct pte*)(pde->pd_off * PAGE);
for(pn=0; pn<1024; pn++) {
pte = &pt[pn];
if (pte->pt_flag & PTE_P) {
pg = pgfind(pte->pt_off);
pgfree(pg);
}
}
kfree(pt, PAGE);
}
}
return 0;
}
/*
* Move p to a new or existing process group (and session)
*/
int
enterpgrp(proc_p p, pid_t pgid, int mksess) {
register pgrp_p pgrp = pgfind(pgid);
#ifdef DIAGNOSTIC
if (pgrp != NULL && mksess) /* firewalls */
panic("enterpgrp: setsid into non-empty pgrp");
if (SESS_LEADER(p))
panic("enterpgrp: session leader attempted setpgrp");
#endif
{
extern int getpid();
dprintf("%d enterpgrp(p %p (pid: %d),pgid %d,mksess %d) (pgrp = %p pgid: %d)\n",
getpid(),p,p ? p->p_pid : -1,pgid,mksess, pgrp,pgrp ? pgrp->pg_id : -1);
}
if (pgrp == NULL) {
pid_t savepid = p->p_pid;
proc_p np;
/*
* new process group
*/
#ifdef DIAGNOSTIC
if (p->p_pid != pgid)
panic("enterpgrp: new pgrp and pid != pgid");
#endif
if ((np = __pd_pfind(savepid)) == NULL || np != p)
return (ESRCH);
pgrp = pgrp_alloc();
if (mksess) {
session_p sess;
/*
* new session
*/
sess = session_alloc();
sess->s_leader = p;
sess->s_count = 1;
sess->s_ttyp = (struct tty *)0;
bcopy(p->p_session->s_login, sess->s_login,
sizeof(sess->s_login));
p->p_flag &= ~P_CONTROLT;
pgrp->pg_session = sess;
} else {
pgrp->pg_session = p->p_session;
pgrp->pg_session->s_count++;
}
pgrp->pg_id = pgid;
LIST_INIT(&pgrp->pg_members);
pgrp->pg_jobc = 0;
} else if (pgrp == p->p_pgrp)
return (0);
/*
* 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);
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);
}
/* ARGSUSED */
int
setpgrp(int flag, int pid, int pgid)
{
register proc_t *p = ttoproc(curthread);
register int retval = 0;
switch (flag) {
case 1: /* setpgrp() */
mutex_enter(&pidlock);
if (p->p_sessp->s_sidp != p->p_pidp && !pgmembers(p->p_pid)) {
mutex_exit(&pidlock);
sess_create();
} else
mutex_exit(&pidlock);
return (p->p_sessp->s_sid);
case 3: /* setsid() */
mutex_enter(&pidlock);
if (p->p_pgidp == p->p_pidp || pgmembers(p->p_pid)) {
mutex_exit(&pidlock);
return (set_errno(EPERM));
}
mutex_exit(&pidlock);
sess_create();
return (p->p_sessp->s_sid);
case 5: /* setpgid() */
{
mutex_enter(&pidlock);
if (pid == 0)
pid = p->p_pid;
else if (pid < 0 || pid >= maxpid) {
mutex_exit(&pidlock);
return (set_errno(EINVAL));
} else if (pid != p->p_pid) {
for (p = p->p_child; /* empty */; p = p->p_sibling) {
if (p == NULL) {
mutex_exit(&pidlock);
return (set_errno(ESRCH));
}
if (p->p_pid == pid)
break;
}
if (p->p_flag & SEXECED) {
mutex_exit(&pidlock);
return (set_errno(EACCES));
}
if (p->p_sessp != ttoproc(curthread)->p_sessp) {
mutex_exit(&pidlock);
return (set_errno(EPERM));
}
}
if (p->p_sessp->s_sid == pid) {
mutex_exit(&pidlock);
return (set_errno(EPERM));
}
if (pgid == 0)
pgid = p->p_pid;
else if (pgid < 0 || pgid >= maxpid) {
mutex_exit(&pidlock);
return (set_errno(EINVAL));
}
if (p->p_pgrp == pgid) {
mutex_exit(&pidlock);
break;
} else if (p->p_pid == pgid) {
/*
* We need to protect p_pgidp with p_lock because
* /proc looks at it while holding only p_lock.
*/
mutex_enter(&p->p_lock);
pgexit(p);
pgjoin(p, p->p_pidp);
mutex_exit(&p->p_lock);
} else {
register proc_t *q;
if ((q = pgfind(pgid)) == NULL ||
q->p_sessp != p->p_sessp) {
mutex_exit(&pidlock);
return (set_errno(EPERM));
}
/*
* See comment above about p_lock and /proc
*/
mutex_enter(&p->p_lock);
pgexit(p);
pgjoin(p, q->p_pgidp);
mutex_exit(&p->p_lock);
}
mutex_exit(&pidlock);
break;
}
case 0: /* getpgrp() */
mutex_enter(&pidlock);
retval = p->p_pgrp;
mutex_exit(&pidlock);
break;
case 2: /* getsid() */
case 4: /* getpgid() */
if (pid < 0 || pid >= maxpid) {
return (set_errno(EINVAL));
}
mutex_enter(&pidlock);
if (pid != 0 && p->p_pid != pid &&
((p = prfind(pid)) == NULL || p->p_stat == SIDL)) {
mutex_exit(&pidlock);
return (set_errno(ESRCH));
}
if (flag == 2)
retval = p->p_sessp->s_sid;
else
retval = p->p_pgrp;
mutex_exit(&pidlock);
break;
}
return (retval);
}
/* ARGSUSED */
int
sys_ktrace(struct proc *curp, void *v, register_t *retval)
{
struct sys_ktrace_args /* {
syscallarg(const char *) fname;
syscallarg(int) ops;
syscallarg(int) facs;
syscallarg(pid_t) pid;
} */ *uap = v;
struct vnode *vp = NULL;
struct proc *p = NULL;
struct pgrp *pg;
int facs = SCARG(uap, facs) & ~((unsigned) KTRFAC_ROOT);
int ops = KTROP(SCARG(uap, ops));
int descend = SCARG(uap, ops) & KTRFLAG_DESCEND;
int ret = 0;
int error = 0;
struct nameidata nd;
curp->p_traceflag |= KTRFAC_ACTIVE;
if (ops != KTROP_CLEAR) {
/*
* an operation which requires a file argument.
*/
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, fname),
curp);
if ((error = vn_open(&nd, FREAD|FWRITE|O_NOFOLLOW, 0)) != 0) {
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (error);
}
vp = nd.ni_vp;
VOP_UNLOCK(vp, 0, curp);
if (vp->v_type != VREG) {
(void) vn_close(vp, FREAD|FWRITE, curp->p_ucred, curp);
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (EACCES);
}
}
/*
* Clear all uses of the tracefile
*/
if (ops == KTROP_CLEARFILE) {
for (p = LIST_FIRST(&allproc); p; p = LIST_NEXT(p, p_list)) {
if (p->p_tracep == vp) {
if (ktrcanset(curp, p)) {
p->p_traceflag = 0;
ktrsettracevnode(p, NULL);
} else
error = EPERM;
}
}
goto done;
}
/*
* need something to (un)trace (XXX - why is this here?)
*/
if (!facs) {
error = EINVAL;
goto done;
}
/*
* do it
*/
if (SCARG(uap, pid) < 0) {
/*
* by process group
*/
pg = pgfind(-SCARG(uap, pid));
if (pg == NULL) {
error = ESRCH;
goto done;
}
LIST_FOREACH(p, &pg->pg_members, p_pglist)
if (descend)
ret |= ktrsetchildren(curp, p, ops, facs, vp);
else
ret |= ktrops(curp, p, ops, facs, vp);
} else {
static int
set_proc_info(pid_t pid, const char *path, core_content_t content)
{
proc_t *p;
counter_t counter;
int error = 0;
counter.cc_count = 0;
/*
* Only one of the core file path or content can be set at a time.
*/
if (path != NULL) {
counter.cc_path = corectl_path_alloc(path);
counter.cc_content = NULL;
} else {
counter.cc_path = NULL;
counter.cc_content = corectl_content_alloc(content);
}
if (pid == -1) {
procset_t set;
setprocset(&set, POP_AND, P_ALL, P_MYID, P_ALL, P_MYID);
error = dotoprocs(&set, set_one_proc_info, (char *)&counter);
if (error == 0 && counter.cc_count == 0)
error = EPERM;
} else if (pid > 0) {
mutex_enter(&pidlock);
if ((p = prfind(pid)) == NULL || p->p_stat == SIDL) {
error = ESRCH;
} else {
(void) set_one_proc_info(p, &counter);
if (counter.cc_count == 0)
error = EPERM;
}
mutex_exit(&pidlock);
} else {
int nfound = 0;
pid_t pgid;
if (pid == 0)
pgid = curproc->p_pgrp;
else
pgid = -pid;
mutex_enter(&pidlock);
for (p = pgfind(pgid); p != NULL; p = p->p_pglink) {
if (p->p_stat != SIDL) {
nfound++;
(void) set_one_proc_info(p, &counter);
}
}
mutex_exit(&pidlock);
if (nfound == 0)
error = ESRCH;
else if (counter.cc_count == 0)
error = EPERM;
}
if (path != NULL)
corectl_path_rele(counter.cc_path);
else
corectl_content_rele(counter.cc_content);
if (error)
return (set_errno(error));
return (0);
}
