[unix-history] / usr / src / sys / kern / kern_exec.c

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)kern_exec.c	7.1 (Berkeley) %G%
 */

#include "../machine/reg.h"
#include "../machine/pte.h"
#include "../machine/psl.h"

#include "param.h"
#include "systm.h"
#include "map.h"
#include "dir.h"
#include "user.h"
#include "kernel.h"
#include "proc.h"
#include "buf.h"
#include "inode.h"
#include "seg.h"
#include "vm.h"
#include "text.h"
#include "file.h"
#include "uio.h"
#include "acct.h"
#include "exec.h"

#ifdef vax
#include "../vax/mtpr.h"
#endif

/*
 * exec system call, with and without environments.
 */
struct execa {
	char	*fname;
	char	**argp;
	char	**envp;
};

execv()
{
	((struct execa *)u.u_ap)->envp = NULL;
	execve();
}

execve()
{
	register nc;
	register char *cp;
	register struct buf *bp;
	register struct execa *uap;
	int na, ne, ucp, ap, cc;
	unsigned len;
	int indir, uid, gid;
	char *sharg;
	struct inode *ip;
	swblk_t bno;
	char cfname[MAXCOMLEN + 1];
#define	SHSIZE	32
	char cfarg[SHSIZE];
	union {
		char	ex_shell[SHSIZE];	/* #! and name of interpreter */
		struct	exec ex_exec;
	} exdata;
	register struct nameidata *ndp = &u.u_nd;
	int resid, error;

	ndp->ni_nameiop = LOOKUP | FOLLOW;
	ndp->ni_segflg = UIO_USERSPACE;
	ndp->ni_dirp = ((struct execa *)u.u_ap)->fname;
	if ((ip = namei(ndp)) == NULL)
		return;
	bno = 0;
	bp = 0;
	indir = 0;
	uid = u.u_uid;
	gid = u.u_gid;
	if (ip->i_mode & ISUID)
		uid = ip->i_uid;
	if (ip->i_mode & ISGID)
		gid = ip->i_gid;

  again:
	if (access(ip, IEXEC))
		goto bad;
	if ((u.u_procp->p_flag&STRC) && access(ip, IREAD))
		goto bad;
	if ((ip->i_mode & IFMT) != IFREG ||
	   (ip->i_mode & (IEXEC|(IEXEC>>3)|(IEXEC>>6))) == 0) {
		u.u_error = EACCES;
		goto bad;
	}

	/*
	 * Read in first few bytes of file for segment sizes, magic number:
	 *	407 = plain executable
	 *	410 = RO text
	 *	413 = demand paged RO text
	 * Also an ASCII line beginning with #! is
	 * the file name of a ``shell'' and arguments may be prepended
	 * to the argument list if given here.
	 *
	 * SHELL NAMES ARE LIMITED IN LENGTH.
	 *
	 * ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM
	 * THE ASCII LINE.
	 */
	exdata.ex_shell[0] = '\0';	/* for zero length files */
	u.u_error = rdwri(UIO_READ, ip, (caddr_t)&exdata, sizeof (exdata),
	    (off_t)0, 1, &resid);
	if (u.u_error)
		goto bad;
#ifndef lint
	if (resid > sizeof(exdata) - sizeof(exdata.ex_exec) &&
	    exdata.ex_shell[0] != '#') {
		u.u_error = ENOEXEC;
		goto bad;
	}
#endif
	switch ((int)exdata.ex_exec.a_magic) {

	case 0407:
		exdata.ex_exec.a_data += exdata.ex_exec.a_text;
		exdata.ex_exec.a_text = 0;
		break;

	case 0413:
	case 0410:
		if (exdata.ex_exec.a_text == 0) {
			u.u_error = ENOEXEC;
			goto bad;
		}
		break;

	default:
		if (exdata.ex_shell[0] != '#' ||
		    exdata.ex_shell[1] != '!' ||
		    indir) {
			u.u_error = ENOEXEC;
			goto bad;
		}
		cp = &exdata.ex_shell[2];		/* skip "#!" */
		while (cp < &exdata.ex_shell[SHSIZE]) {
			if (*cp == '\t')
				*cp = ' ';
			else if (*cp == '\n') {
				*cp = '\0';
				break;
			}
			cp++;
		}
		if (*cp != '\0') {
			u.u_error = ENOEXEC;
			goto bad;
		}
		cp = &exdata.ex_shell[2];
		while (*cp == ' ')
			cp++;
		ndp->ni_dirp = cp;
		while (*cp && *cp != ' ')
			cp++;
		cfarg[0] = '\0';
		if (*cp) {
			*cp++ = '\0';
			while (*cp == ' ')
				cp++;
			if (*cp)
				bcopy((caddr_t)cp, (caddr_t)cfarg, SHSIZE);
		}
		indir = 1;
		iput(ip);
		ndp->ni_nameiop = LOOKUP | FOLLOW;
		ndp->ni_segflg = UIO_SYSSPACE;
		ip = namei(ndp);
		if (ip == NULL)
			return;
		bcopy((caddr_t)ndp->ni_dent.d_name, (caddr_t)cfname,
		    MAXCOMLEN);
		cfname[MAXCOMLEN] = '\0';
		goto again;
	}

	/*
	 * Collect arguments on "file" in swap space.
	 */
	na = 0;
	ne = 0;
	nc = 0;
	cc = 0;
	uap = (struct execa *)u.u_ap;
	bno = rmalloc(argmap, (long)ctod(clrnd((int)btoc(NCARGS))));
	if (bno == 0) {
		swkill(u.u_procp, "exec: no swap space");
		goto bad;
	}
	if (bno % CLSIZE)
		panic("execa rmalloc");
	/*
	 * Copy arguments into file in argdev area.
	 */
	if (uap->argp) for (;;) {
		ap = NULL;
		sharg = NULL;
		if (indir && na == 0) {
			sharg = cfname;
			ap = (int)sharg;
			uap->argp++;		/* ignore argv[0] */
		} else if (indir && (na == 1 && cfarg[0])) {
			sharg = cfarg;
			ap = (int)sharg;
		} else if (indir && (na == 1 || na == 2 && cfarg[0]))
			ap = (int)uap->fname;
		else if (uap->argp) {
			ap = fuword((caddr_t)uap->argp);
			uap->argp++;
		}
		if (ap == NULL && uap->envp) {
			uap->argp = NULL;
			if ((ap = fuword((caddr_t)uap->envp)) != NULL)
				uap->envp++, ne++;
		}
		if (ap == NULL)
			break;
		na++;
		if (ap == -1) {
			u.u_error = EFAULT;
			break;
		}
		do {
			if (cc <= 0) {
				/*
				 * We depend on NCARGS being a multiple of
				 * CLSIZE*NBPG.  This way we need only check
				 * overflow before each buffer allocation.
				 */
				if (nc >= NCARGS-1) {
					error = E2BIG;
					break;
				}
				if (bp)
					bdwrite(bp);
				cc = CLSIZE*NBPG;
				bp = getblk(argdev, bno + ctod(nc/NBPG), cc);
				cp = bp->b_un.b_addr;
			}
			if (sharg) {
				error = copystr(sharg, cp, (unsigned)cc, &len);
				sharg += len;
			} else {
				error = copyinstr((caddr_t)ap, cp, (unsigned)cc,
				    &len);
				ap += len;
			}
			cp += len;
			nc += len;
			cc -= len;
		} while (error == ENOENT);
		if (error) {
			u.u_error = error;
			if (bp)
				brelse(bp);
			bp = 0;
			goto badarg;
		}
	}
	if (bp)
		bdwrite(bp);
	bp = 0;
	nc = (nc + NBPW-1) & ~(NBPW-1);
	getxfile(ip, &exdata.ex_exec, nc + (na+4)*NBPW, uid, gid);
	if (u.u_error) {
badarg:
		for (cc = 0; cc < nc; cc += CLSIZE*NBPG) {
			bp = baddr(argdev, bno + ctod(cc/NBPG), CLSIZE*NBPG);
			if (bp) {
				bp->b_flags |= B_AGE;		/* throw away */
				bp->b_flags &= ~B_DELWRI;	/* cancel io */
				brelse(bp);
				bp = 0;
			}
		}
		goto bad;
	}
	iput(ip);
	ip = NULL;

	/*
	 * Copy back arglist.
	 */
	ucp = USRSTACK - nc - NBPW;
	ap = ucp - na*NBPW - 3*NBPW;
	u.u_ar0[SP] = ap;
	(void) suword((caddr_t)ap, na-ne);
	nc = 0;
	cc = 0;
	for (;;) {
		ap += NBPW;
		if (na == ne) {
			(void) suword((caddr_t)ap, 0);
			ap += NBPW;
		}
		if (--na < 0)
			break;
		(void) suword((caddr_t)ap, ucp);
		do {
			if (cc <= 0) {
				if (bp)
					brelse(bp);
				cc = CLSIZE*NBPG;
				bp = bread(argdev, bno + ctod(nc / NBPG), cc);
				bp->b_flags |= B_AGE;		/* throw away */
				bp->b_flags &= ~B_DELWRI;	/* cancel io */
				cp = bp->b_un.b_addr;
			}
			error = copyoutstr(cp, (caddr_t)ucp, (unsigned)cc,
			    &len);
			ucp += len;
			cp += len;
			nc += len;
			cc -= len;
		} while (error == ENOENT);
		if (error == EFAULT)
			panic("exec: EFAULT");
	}
	(void) suword((caddr_t)ap, 0);

	/*
	 * Reset caught signals.  Held signals
	 * remain held through p_sigmask.
	 */
	while (u.u_procp->p_sigcatch) {
		nc = ffs((long)u.u_procp->p_sigcatch);
		u.u_procp->p_sigcatch &= ~sigmask(nc);
		u.u_signal[nc] = SIG_DFL;
	}
	/*
	 * Reset stack state to the user stack.
	 * Clear set of signals caught on the signal stack.
	 */
	u.u_onstack = 0;
	u.u_sigsp = 0;
	u.u_sigonstack = 0;

	for (nc = u.u_lastfile; nc >= 0; --nc) {
		if (u.u_pofile[nc] & UF_EXCLOSE) {
			closef(u.u_ofile[nc]);
			u.u_ofile[nc] = NULL;
			u.u_pofile[nc] = 0;
		}
		u.u_pofile[nc] &= ~UF_MAPPED;
	}
	while (u.u_lastfile >= 0 && u.u_ofile[u.u_lastfile] == NULL)
		u.u_lastfile--;
	setregs(exdata.ex_exec.a_entry);
	/*
	 * Remember file name for accounting.
	 */
	u.u_acflag &= ~AFORK;
	if (indir)
		bcopy((caddr_t)cfname, (caddr_t)u.u_comm, MAXCOMLEN);
	else {
		if (ndp->ni_dent.d_namlen > MAXCOMLEN)
			ndp->ni_dent.d_namlen = MAXCOMLEN;
		bcopy((caddr_t)ndp->ni_dent.d_name, (caddr_t)u.u_comm,
		    (unsigned)(ndp->ni_dent.d_namlen + 1));
	}
bad:
	if (bp)
		brelse(bp);
	if (bno)
		rmfree(argmap, (long)ctod(clrnd((int) btoc(NCARGS))), bno);
	if (ip)
		iput(ip);
}

/*
 * Read in and set up memory for executed file.
 */
getxfile(ip, ep, nargc, uid, gid)
	register struct inode *ip;
	register struct exec *ep;
	int nargc, uid, gid;
{
	size_t ts, ds, ids, uds, ss;
	int pagi;

	if (ep->a_magic == 0413)
		pagi = SPAGI;
	else
		pagi = 0;
	if (ip->i_text && (ip->i_text->x_flag & XTRC)) {
		u.u_error = ETXTBSY;
		goto bad;
	}
	if (ep->a_text != 0 && (ip->i_flag&ITEXT) == 0 &&
	    ip->i_count != 1) {
		register struct file *fp;

		for (fp = file; fp < fileNFILE; fp++) {
			if (fp->f_type == DTYPE_INODE &&
			    fp->f_count > 0 &&
			    (struct inode *)fp->f_data == ip &&
			    (fp->f_flag&FWRITE)) {
				u.u_error = ETXTBSY;
				goto bad;
			}
		}
	}

	/*
	 * Compute text and data sizes and make sure not too large.
	 * NB - Check data and bss separately as they may overflow 
	 * when summed together.
	 */
	ts = clrnd(btoc(ep->a_text));
	ids = clrnd(btoc(ep->a_data));
	uds = clrnd(btoc(ep->a_bss));
	ds = clrnd(btoc(ep->a_data + ep->a_bss));
	ss = clrnd(SSIZE + btoc(nargc));
	if (chksize((unsigned)ts, (unsigned)ids, (unsigned)uds, (unsigned)ss))
		goto bad;

	/*
	 * Make sure enough space to start process.
	 */
	u.u_cdmap = zdmap;
	u.u_csmap = zdmap;
	if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL)
		goto bad;

	/*
	 * At this point, committed to the new image!
	 * Release virtual memory resources of old process, and
	 * initialize the virtual memory of the new process.
	 * If we resulted from vfork(), instead wakeup our
	 * parent who will set SVFDONE when he has taken back
	 * our resources.
	 */
	if ((u.u_procp->p_flag & SVFORK) == 0)
		vrelvm();
	else {
		u.u_procp->p_flag &= ~SVFORK;
		u.u_procp->p_flag |= SKEEP;
		wakeup((caddr_t)u.u_procp);
		while ((u.u_procp->p_flag & SVFDONE) == 0)
			sleep((caddr_t)u.u_procp, PZERO - 1);
		u.u_procp->p_flag &= ~(SVFDONE|SKEEP);
	}
	u.u_procp->p_flag &= ~(SPAGI|SSEQL|SUANOM|SOUSIG);
	u.u_procp->p_flag |= pagi;
	u.u_dmap = u.u_cdmap;
	u.u_smap = u.u_csmap;
	vgetvm(ts, ds, ss);

	if (pagi == 0)
		u.u_error =
		    rdwri(UIO_READ, ip,
			(char *)ctob(dptov(u.u_procp, 0)),
			(int)ep->a_data,
			(off_t)(sizeof (struct exec) + ep->a_text),
			0, (int *)0);
	xalloc(ip, ep, pagi);
	if (pagi && u.u_procp->p_textp)
		vinifod((struct fpte *)dptopte(u.u_procp, 0),
		    PG_FTEXT, u.u_procp->p_textp->x_iptr,
		    (long)(1 + ts/CLSIZE), (size_t)btoc(ep->a_data));

#ifdef vax
	/* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */
	mtpr(TBIA, 0);
#endif

	if (u.u_error)
		swkill(u.u_procp, "exec: I/O error mapping pages");
	/*
	 * set SUID/SGID protections, if no tracing
	 */
	if ((u.u_procp->p_flag&STRC)==0) {
		u.u_uid = uid;
		u.u_procp->p_uid = uid;
		u.u_gid = gid;
	} else
		psignal(u.u_procp, SIGTRAP);
	u.u_tsize = ts;
	u.u_dsize = ds;
	u.u_ssize = ss;
	u.u_prof.pr_scale = 0;
bad:
	return;
}
Commit	Line	Data
da7c5cc6	1	/*
0880b18e	2	* Copyright (c) 1982, 1986 Regents of the University of California.
da7c5cc6 KM	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*
0880b18e	6	* @(#)kern_exec.c 7.1 (Berkeley) %G%
da7c5cc6	7	*/
28db9b87 SL	8
	9	#include "../machine/reg.h"
	10	#include "../machine/pte.h"
	11	#include "../machine/psl.h"
	12
94368568 JB	13	#include "param.h"
	14	#include "systm.h"
	15	#include "map.h"
	16	#include "dir.h"
	17	#include "user.h"
	18	#include "kernel.h"
	19	#include "proc.h"
	20	#include "buf.h"
	21	#include "inode.h"
	22	#include "seg.h"
	23	#include "vm.h"
	24	#include "text.h"
	25	#include "file.h"
	26	#include "uio.h"
	27	#include "acct.h"
	28	#include "exec.h"
28db9b87	29
e3d5bfde SL	30	#ifdef vax
	31	#include "../vax/mtpr.h"
	32	#endif
	33
28db9b87 SL	34	/*
	35	* exec system call, with and without environments.
	36	*/
	37	struct execa {
	38	char *fname;
	39	char **argp;
	40	char **envp;
	41	};
	42
	43	execv()
	44	{
	45	((struct execa *)u.u_ap)->envp = NULL;
	46	execve();
	47	}
	48
	49	execve()
	50	{
	51	register nc;
	52	register char *cp;
	53	register struct buf *bp;
	54	register struct execa *uap;
8011f5df MK	55	int na, ne, ucp, ap, cc;
8011f5df MK	56	unsigned len;
28db9b87 SL	57	int indir, uid, gid;
	58	char *sharg;
	59	struct inode *ip;
	60	swblk_t bno;
	61	char cfname[MAXCOMLEN + 1];
9fd50f35	62	#define SHSIZE 32
28db9b87	63	char cfarg[SHSIZE];
9fd50f35 SL	64	union {
	65	char ex_shell[SHSIZE]; /* #! and name of interpreter */
	66	struct exec ex_exec;
	67	} exdata;
715baff1	68	register struct nameidata *ndp = &u.u_nd;
f3aaea26	69	int resid, error;
28db9b87	70
715baff1 KM	71	ndp->ni_nameiop = LOOKUP \| FOLLOW;
	72	ndp->ni_segflg = UIO_USERSPACE;
	73	ndp->ni_dirp = ((struct execa *)u.u_ap)->fname;
	74	if ((ip = namei(ndp)) == NULL)
28db9b87 SL	75	return;
	76	bno = 0;
	77	bp = 0;
	78	indir = 0;
	79	uid = u.u_uid;
	80	gid = u.u_gid;
	81	if (ip->i_mode & ISUID)
	82	uid = ip->i_uid;
	83	if (ip->i_mode & ISGID)
	84	gid = ip->i_gid;
	85
	86	again:
	87	if (access(ip, IEXEC))
	88	goto bad;
	89	if ((u.u_procp->p_flag&STRC) && access(ip, IREAD))
	90	goto bad;
	91	if ((ip->i_mode & IFMT) != IFREG \|\|
	92	(ip->i_mode & (IEXEC\|(IEXEC>>3)\|(IEXEC>>6))) == 0) {
	93	u.u_error = EACCES;
	94	goto bad;
	95	}
	96
	97	/*
f3aaea26	98	* Read in first few bytes of file for segment sizes, magic number:
28db9b87 SL	99	* 407 = plain executable
	100	* 410 = RO text
	101	* 413 = demand paged RO text
	102	* Also an ASCII line beginning with #! is
	103	* the file name of a ``shell'' and arguments may be prepended
	104	* to the argument list if given here.
	105	*
	106	* SHELL NAMES ARE LIMITED IN LENGTH.
	107	*
	108	* ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM
	109	* THE ASCII LINE.
	110	*/
9fd50f35	111	exdata.ex_shell[0] = '\0'; /* for zero length files */
f3aaea26	112	u.u_error = rdwri(UIO_READ, ip, (caddr_t)&exdata, sizeof (exdata),
8011f5df	113	(off_t)0, 1, &resid);
28db9b87 SL	114	if (u.u_error)
28db9b87 SL	115	goto bad;
28db9b87	116	#ifndef lint
ce66cb03	117	if (resid > sizeof(exdata) - sizeof(exdata.ex_exec) &&
9fd50f35	118	exdata.ex_shell[0] != '#') {
28db9b87 SL	119	u.u_error = ENOEXEC;
	120	goto bad;
	121	}
	122	#endif
aec7dd3b	123	switch ((int)exdata.ex_exec.a_magic) {
28db9b87 SL	124
28db9b87 SL	125	case 0407:
9fd50f35 SL	126	exdata.ex_exec.a_data += exdata.ex_exec.a_text;
9fd50f35 SL	127	exdata.ex_exec.a_text = 0;
28db9b87 SL	128	break;
	129
	130	case 0413:
	131	case 0410:
9fd50f35	132	if (exdata.ex_exec.a_text == 0) {
28db9b87 SL	133	u.u_error = ENOEXEC;
	134	goto bad;
	135	}
	136	break;
	137
	138	default:
9fd50f35 SL	139	if (exdata.ex_shell[0] != '#' \|\|
9fd50f35 SL	140	exdata.ex_shell[1] != '!' \|\|
28db9b87 SL	141	indir) {
	142	u.u_error = ENOEXEC;
	143	goto bad;
	144	}
9fd50f35 SL	145	cp = &exdata.ex_shell[2]; /* skip "#!" */
9fd50f35 SL	146	while (cp < &exdata.ex_shell[SHSIZE]) {
28db9b87 SL	147	if (*cp == '\t')
	148	*cp = ' ';
	149	else if (*cp == '\n') {
	150	*cp = '\0';
	151	break;
	152	}
	153	cp++;
	154	}
	155	if (*cp != '\0') {
	156	u.u_error = ENOEXEC;
	157	goto bad;
	158	}
9fd50f35	159	cp = &exdata.ex_shell[2];
28db9b87 SL	160	while (*cp == ' ')
28db9b87 SL	161	cp++;
715baff1	162	ndp->ni_dirp = cp;
28db9b87 SL	163	while (cp && cp != ' ')
28db9b87 SL	164	cp++;
ce66cb03	165	cfarg[0] = '\0';
28db9b87 SL	166	if (*cp) {
	167	*cp++ = '\0';
	168	while (*cp == ' ')
	169	cp++;
ce66cb03	170	if (*cp)
28db9b87	171	bcopy((caddr_t)cp, (caddr_t)cfarg, SHSIZE);
28db9b87	172	}
28db9b87 SL	173	indir = 1;
28db9b87 SL	174	iput(ip);
715baff1 KM	175	ndp->ni_nameiop = LOOKUP \| FOLLOW;
	176	ndp->ni_segflg = UIO_SYSSPACE;
	177	ip = namei(ndp);
28db9b87 SL	178	if (ip == NULL)
28db9b87 SL	179	return;
ce66cb03 MK	180	bcopy((caddr_t)ndp->ni_dent.d_name, (caddr_t)cfname,
	181	MAXCOMLEN);
	182	cfname[MAXCOMLEN] = '\0';
28db9b87 SL	183	goto again;
	184	}
	185
	186	/*
	187	* Collect arguments on "file" in swap space.
	188	*/
	189	na = 0;
	190	ne = 0;
	191	nc = 0;
f3aaea26	192	cc = 0;
28db9b87	193	uap = (struct execa *)u.u_ap;
9fd50f35 SL	194	bno = rmalloc(argmap, (long)ctod(clrnd((int)btoc(NCARGS))));
9fd50f35 SL	195	if (bno == 0) {
d03b3d84	196	swkill(u.u_procp, "exec: no swap space");
28db9b87 SL	197	goto bad;
	198	}
	199	if (bno % CLSIZE)
	200	panic("execa rmalloc");
f3aaea26 SL	201	/*
	202	* Copy arguments into file in argdev area.
	203	*/
28db9b87 SL	204	if (uap->argp) for (;;) {
28db9b87 SL	205	ap = NULL;
ce66cb03 MK	206	sharg = NULL;
	207	if (indir && na == 0) {
	208	sharg = cfname;
	209	ap = (int)sharg;
	210	uap->argp++; /* ignore argv[0] */
	211	} else if (indir && (na == 1 && cfarg[0])) {
	212	sharg = cfarg;
	213	ap = (int)sharg;
	214	} else if (indir && (na == 1 \|\| na == 2 && cfarg[0]))
28db9b87 SL	215	ap = (int)uap->fname;
	216	else if (uap->argp) {
	217	ap = fuword((caddr_t)uap->argp);
	218	uap->argp++;
	219	}
f3aaea26	220	if (ap == NULL && uap->envp) {
28db9b87	221	uap->argp = NULL;
f3aaea26 SL	222	if ((ap = fuword((caddr_t)uap->envp)) != NULL)
f3aaea26 SL	223	uap->envp++, ne++;
28db9b87 SL	224	}
	225	if (ap == NULL)
	226	break;
	227	na++;
f3aaea26	228	if (ap == -1) {
1daa95c7	229	u.u_error = EFAULT;
f3aaea26 SL	230	break;
f3aaea26 SL	231	}
28db9b87	232	do {
f3aaea26 SL	233	if (cc <= 0) {
	234	/*
	235	* We depend on NCARGS being a multiple of
	236	* CLSIZE*NBPG. This way we need only check
	237	* overflow before each buffer allocation.
	238	*/
	239	if (nc >= NCARGS-1) {
	240	error = E2BIG;
	241	break;
	242	}
28db9b87 SL	243	if (bp)
28db9b87 SL	244	bdwrite(bp);
f3aaea26 SL	245	cc = CLSIZE*NBPG;
f3aaea26 SL	246	bp = getblk(argdev, bno + ctod(nc/NBPG), cc);
28db9b87 SL	247	cp = bp->b_un.b_addr;
28db9b87 SL	248	}
ce66cb03	249	if (sharg) {
8011f5df	250	error = copystr(sharg, cp, (unsigned)cc, &len);
ce66cb03 MK	251	sharg += len;
ce66cb03 MK	252	} else {
8011f5df MK	253	error = copyinstr((caddr_t)ap, cp, (unsigned)cc,
8011f5df MK	254	&len);
ce66cb03 MK	255	ap += len;
ce66cb03 MK	256	}
f3aaea26 SL	257	cp += len;
	258	nc += len;
	259	cc -= len;
	260	} while (error == ENOENT);
	261	if (error) {
	262	u.u_error = error;
	263	if (bp)
	264	brelse(bp);
	265	bp = 0;
	266	goto badarg;
	267	}
28db9b87 SL	268	}
	269	if (bp)
	270	bdwrite(bp);
	271	bp = 0;
	272	nc = (nc + NBPW-1) & ~(NBPW-1);
9fd50f35	273	getxfile(ip, &exdata.ex_exec, nc + (na+4)*NBPW, uid, gid);
28db9b87 SL	274	if (u.u_error) {
28db9b87 SL	275	badarg:
f3aaea26 SL	276	for (cc = 0; cc < nc; cc += CLSIZE*NBPG) {
f3aaea26 SL	277	bp = baddr(argdev, bno + ctod(cc/NBPG), CLSIZE*NBPG);
28db9b87 SL	278	if (bp) {
	279	bp->b_flags \|= B_AGE; /* throw away */
	280	bp->b_flags &= ~B_DELWRI; /* cancel io */
	281	brelse(bp);
	282	bp = 0;
	283	}
	284	}
	285	goto bad;
	286	}
ce66cb03 MK	287	iput(ip);
ce66cb03 MK	288	ip = NULL;
28db9b87 SL	289
28db9b87 SL	290	/*
f3aaea26	291	* Copy back arglist.
28db9b87 SL	292	*/
	293	ucp = USRSTACK - nc - NBPW;
	294	ap = ucp - naNBPW - 3NBPW;
	295	u.u_ar0[SP] = ap;
	296	(void) suword((caddr_t)ap, na-ne);
	297	nc = 0;
72d4f41a	298	cc = 0;
28db9b87 SL	299	for (;;) {
28db9b87 SL	300	ap += NBPW;
f3aaea26	301	if (na == ne) {
28db9b87 SL	302	(void) suword((caddr_t)ap, 0);
	303	ap += NBPW;
	304	}
	305	if (--na < 0)
	306	break;
	307	(void) suword((caddr_t)ap, ucp);
	308	do {
72d4f41a	309	if (cc <= 0) {
28db9b87 SL	310	if (bp)
28db9b87 SL	311	brelse(bp);
72d4f41a SL	312	cc = CLSIZE*NBPG;
72d4f41a SL	313	bp = bread(argdev, bno + ctod(nc / NBPG), cc);
28db9b87 SL	314	bp->b_flags \|= B_AGE; /* throw away */
	315	bp->b_flags &= ~B_DELWRI; /* cancel io */
	316	cp = bp->b_un.b_addr;
	317	}
8011f5df MK	318	error = copyoutstr(cp, (caddr_t)ucp, (unsigned)cc,
8011f5df MK	319	&len);
72d4f41a SL	320	ucp += len;
	321	cp += len;
	322	nc += len;
	323	cc -= len;
	324	} while (error == ENOENT);
	325	if (error == EFAULT)
	326	panic("exec: EFAULT");
28db9b87 SL	327	}
28db9b87 SL	328	(void) suword((caddr_t)ap, 0);
ce66cb03 MK	329
	330	/*
	331	* Reset caught signals. Held signals
	332	* remain held through p_sigmask.
	333	*/
	334	while (u.u_procp->p_sigcatch) {
8011f5df	335	nc = ffs((long)u.u_procp->p_sigcatch);
ce66cb03 MK	336	u.u_procp->p_sigcatch &= ~sigmask(nc);
	337	u.u_signal[nc] = SIG_DFL;
	338	}
	339	/*
	340	* Reset stack state to the user stack.
	341	* Clear set of signals caught on the signal stack.
	342	*/
	343	u.u_onstack = 0;
	344	u.u_sigsp = 0;
	345	u.u_sigonstack = 0;
	346
	347	for (nc = u.u_lastfile; nc >= 0; --nc) {
	348	if (u.u_pofile[nc] & UF_EXCLOSE) {
	349	closef(u.u_ofile[nc]);
	350	u.u_ofile[nc] = NULL;
	351	u.u_pofile[nc] = 0;
	352	}
	353	u.u_pofile[nc] &= ~UF_MAPPED;
	354	}
	355	while (u.u_lastfile >= 0 && u.u_ofile[u.u_lastfile] == NULL)
	356	u.u_lastfile--;
9fd50f35	357	setregs(exdata.ex_exec.a_entry);
715baff1 KM	358	/*
	359	* Remember file name for accounting.
	360	*/
	361	u.u_acflag &= ~AFORK;
ce66cb03 MK	362	if (indir)
	363	bcopy((caddr_t)cfname, (caddr_t)u.u_comm, MAXCOMLEN);
	364	else {
	365	if (ndp->ni_dent.d_namlen > MAXCOMLEN)
	366	ndp->ni_dent.d_namlen = MAXCOMLEN;
	367	bcopy((caddr_t)ndp->ni_dent.d_name, (caddr_t)u.u_comm,
	368	(unsigned)(ndp->ni_dent.d_namlen + 1));
	369	}
28db9b87 SL	370	bad:
	371	if (bp)
	372	brelse(bp);
	373	if (bno)
	374	rmfree(argmap, (long)ctod(clrnd((int) btoc(NCARGS))), bno);
ce66cb03 MK	375	if (ip)
ce66cb03 MK	376	iput(ip);
28db9b87 SL	377	}
	378
	379	/*
	380	* Read in and set up memory for executed file.
	381	*/
9fd50f35	382	getxfile(ip, ep, nargc, uid, gid)
28db9b87	383	register struct inode *ip;
9fd50f35	384	register struct exec *ep;
28db9b87 SL	385	int nargc, uid, gid;
28db9b87 SL	386	{
0c48b03e	387	size_t ts, ds, ids, uds, ss;
28db9b87 SL	388	int pagi;
28db9b87 SL	389
9fd50f35	390	if (ep->a_magic == 0413)
28db9b87 SL	391	pagi = SPAGI;
	392	else
	393	pagi = 0;
cdb14d96	394	if (ip->i_text && (ip->i_text->x_flag & XTRC)) {
ce08d752 MK	395	u.u_error = ETXTBSY;
	396	goto bad;
	397	}
9fd50f35 SL	398	if (ep->a_text != 0 && (ip->i_flag&ITEXT) == 0 &&
9fd50f35 SL	399	ip->i_count != 1) {
28db9b87 SL	400	register struct file *fp;
	401
	402	for (fp = file; fp < fileNFILE; fp++) {
	403	if (fp->f_type == DTYPE_INODE &&
	404	fp->f_count > 0 &&
	405	(struct inode *)fp->f_data == ip &&
	406	(fp->f_flag&FWRITE)) {
	407	u.u_error = ETXTBSY;
	408	goto bad;
	409	}
	410	}
	411	}
	412
	413	/*
	414	* Compute text and data sizes and make sure not too large.
0c48b03e KM	415	* NB - Check data and bss separately as they may overflow
0c48b03e KM	416	* when summed together.
28db9b87	417	*/
9fd50f35	418	ts = clrnd(btoc(ep->a_text));
0c48b03e KM	419	ids = clrnd(btoc(ep->a_data));
0c48b03e KM	420	uds = clrnd(btoc(ep->a_bss));
f3aaea26	421	ds = clrnd(btoc(ep->a_data + ep->a_bss));
28db9b87	422	ss = clrnd(SSIZE + btoc(nargc));
0c48b03e	423	if (chksize((unsigned)ts, (unsigned)ids, (unsigned)uds, (unsigned)ss))
28db9b87 SL	424	goto bad;
	425
	426	/*
	427	* Make sure enough space to start process.
	428	*/
	429	u.u_cdmap = zdmap;
	430	u.u_csmap = zdmap;
	431	if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL)
	432	goto bad;
	433
	434	/*
	435	* At this point, committed to the new image!
	436	* Release virtual memory resources of old process, and
	437	* initialize the virtual memory of the new process.
	438	* If we resulted from vfork(), instead wakeup our
	439	* parent who will set SVFDONE when he has taken back
	440	* our resources.
	441	*/
	442	if ((u.u_procp->p_flag & SVFORK) == 0)
	443	vrelvm();
	444	else {
	445	u.u_procp->p_flag &= ~SVFORK;
	446	u.u_procp->p_flag \|= SKEEP;
	447	wakeup((caddr_t)u.u_procp);
	448	while ((u.u_procp->p_flag & SVFDONE) == 0)
	449	sleep((caddr_t)u.u_procp, PZERO - 1);
	450	u.u_procp->p_flag &= ~(SVFDONE\|SKEEP);
	451	}
dd012d1e	452	u.u_procp->p_flag &= ~(SPAGI\|SSEQL\|SUANOM\|SOUSIG);
28db9b87 SL	453	u.u_procp->p_flag \|= pagi;
	454	u.u_dmap = u.u_cdmap;
	455	u.u_smap = u.u_csmap;
	456	vgetvm(ts, ds, ss);
	457
	458	if (pagi == 0)
	459	u.u_error =
	460	rdwri(UIO_READ, ip,
	461	(char *)ctob(dptov(u.u_procp, 0)),
9fd50f35	462	(int)ep->a_data,
8011f5df	463	(off_t)(sizeof (struct exec) + ep->a_text),
28db9b87	464	0, (int *)0);
9fd50f35	465	xalloc(ip, ep, pagi);
28db9b87 SL	466	if (pagi && u.u_procp->p_textp)
	467	vinifod((struct fpte *)dptopte(u.u_procp, 0),
	468	PG_FTEXT, u.u_procp->p_textp->x_iptr,
8011f5df	469	(long)(1 + ts/CLSIZE), (size_t)btoc(ep->a_data));
28db9b87 SL	470
	471	#ifdef vax
	472	/* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */
28db9b87 SL	473	mtpr(TBIA, 0);
	474	#endif
	475
	476	if (u.u_error)
d03b3d84	477	swkill(u.u_procp, "exec: I/O error mapping pages");
28db9b87 SL	478	/*
	479	* set SUID/SGID protections, if no tracing
	480	*/
	481	if ((u.u_procp->p_flag&STRC)==0) {
	482	u.u_uid = uid;
	483	u.u_procp->p_uid = uid;
	484	u.u_gid = gid;
	485	} else
	486	psignal(u.u_procp, SIGTRAP);
	487	u.u_tsize = ts;
	488	u.u_dsize = ds;
	489	u.u_ssize = ss;
d4a03a57	490	u.u_prof.pr_scale = 0;
28db9b87 SL	491	bad:
	492	return;
	493	}