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

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)kern_exec.c	6.14 (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, len, cc;
	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),
	    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 (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, cc, &len);
				sharg += len;
			} else {
				error = copyinstr((caddr_t)ap, cp, 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, 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(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_flag & IXMOD) {			/* XXX */
		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,
			(int)(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), (int)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 KM	1	/*
	2	* Copyright (c) 1982 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*
1daa95c7	6	* @(#)kern_exec.c 6.14 (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;
f3aaea26	55	int na, ne, ucp, ap, len, cc;
28db9b87 SL	56	int indir, uid, gid;
	57	char *sharg;
	58	struct inode *ip;
	59	swblk_t bno;
	60	char cfname[MAXCOMLEN + 1];
9fd50f35	61	#define SHSIZE 32
28db9b87	62	char cfarg[SHSIZE];
9fd50f35 SL	63	union {
	64	char ex_shell[SHSIZE]; /* #! and name of interpreter */
	65	struct exec ex_exec;
	66	} exdata;
715baff1	67	register struct nameidata *ndp = &u.u_nd;
f3aaea26	68	int resid, error;
28db9b87	69
715baff1 KM	70	ndp->ni_nameiop = LOOKUP \| FOLLOW;
	71	ndp->ni_segflg = UIO_USERSPACE;
	72	ndp->ni_dirp = ((struct execa *)u.u_ap)->fname;
	73	if ((ip = namei(ndp)) == NULL)
28db9b87 SL	74	return;
	75	bno = 0;
	76	bp = 0;
	77	indir = 0;
	78	uid = u.u_uid;
	79	gid = u.u_gid;
	80	if (ip->i_mode & ISUID)
	81	uid = ip->i_uid;
	82	if (ip->i_mode & ISGID)
	83	gid = ip->i_gid;
	84
	85	again:
	86	if (access(ip, IEXEC))
	87	goto bad;
	88	if ((u.u_procp->p_flag&STRC) && access(ip, IREAD))
	89	goto bad;
	90	if ((ip->i_mode & IFMT) != IFREG \|\|
	91	(ip->i_mode & (IEXEC\|(IEXEC>>3)\|(IEXEC>>6))) == 0) {
	92	u.u_error = EACCES;
	93	goto bad;
	94	}
	95
	96	/*
f3aaea26	97	* Read in first few bytes of file for segment sizes, magic number:
28db9b87 SL	98	* 407 = plain executable
	99	* 410 = RO text
	100	* 413 = demand paged RO text
	101	* Also an ASCII line beginning with #! is
	102	* the file name of a ``shell'' and arguments may be prepended
	103	* to the argument list if given here.
	104	*
	105	* SHELL NAMES ARE LIMITED IN LENGTH.
	106	*
	107	* ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM
	108	* THE ASCII LINE.
	109	*/
9fd50f35	110	exdata.ex_shell[0] = '\0'; /* for zero length files */
f3aaea26 SL	111	u.u_error = rdwri(UIO_READ, ip, (caddr_t)&exdata, sizeof (exdata),
f3aaea26 SL	112	0, 1, &resid);
28db9b87 SL	113	if (u.u_error)
28db9b87 SL	114	goto bad;
28db9b87	115	#ifndef lint
ce66cb03	116	if (resid > sizeof(exdata) - sizeof(exdata.ex_exec) &&
9fd50f35	117	exdata.ex_shell[0] != '#') {
28db9b87 SL	118	u.u_error = ENOEXEC;
	119	goto bad;
	120	}
	121	#endif
9fd50f35	122	switch (exdata.ex_exec.a_magic) {
28db9b87 SL	123
28db9b87 SL	124	case 0407:
9fd50f35 SL	125	exdata.ex_exec.a_data += exdata.ex_exec.a_text;
9fd50f35 SL	126	exdata.ex_exec.a_text = 0;
28db9b87 SL	127	break;
	128
	129	case 0413:
	130	case 0410:
9fd50f35	131	if (exdata.ex_exec.a_text == 0) {
28db9b87 SL	132	u.u_error = ENOEXEC;
	133	goto bad;
	134	}
	135	break;
	136
	137	default:
9fd50f35 SL	138	if (exdata.ex_shell[0] != '#' \|\|
9fd50f35 SL	139	exdata.ex_shell[1] != '!' \|\|
28db9b87 SL	140	indir) {
	141	u.u_error = ENOEXEC;
	142	goto bad;
	143	}
9fd50f35 SL	144	cp = &exdata.ex_shell[2]; /* skip "#!" */
9fd50f35 SL	145	while (cp < &exdata.ex_shell[SHSIZE]) {
28db9b87 SL	146	if (*cp == '\t')
	147	*cp = ' ';
	148	else if (*cp == '\n') {
	149	*cp = '\0';
	150	break;
	151	}
	152	cp++;
	153	}
	154	if (*cp != '\0') {
	155	u.u_error = ENOEXEC;
	156	goto bad;
	157	}
9fd50f35	158	cp = &exdata.ex_shell[2];
28db9b87 SL	159	while (*cp == ' ')
28db9b87 SL	160	cp++;
715baff1	161	ndp->ni_dirp = cp;
28db9b87 SL	162	while (cp && cp != ' ')
28db9b87 SL	163	cp++;
ce66cb03	164	cfarg[0] = '\0';
28db9b87 SL	165	if (*cp) {
	166	*cp++ = '\0';
	167	while (*cp == ' ')
	168	cp++;
ce66cb03	169	if (*cp)
28db9b87	170	bcopy((caddr_t)cp, (caddr_t)cfarg, SHSIZE);
28db9b87	171	}
28db9b87 SL	172	indir = 1;
28db9b87 SL	173	iput(ip);
715baff1 KM	174	ndp->ni_nameiop = LOOKUP \| FOLLOW;
	175	ndp->ni_segflg = UIO_SYSSPACE;
	176	ip = namei(ndp);
28db9b87 SL	177	if (ip == NULL)
28db9b87 SL	178	return;
ce66cb03 MK	179	bcopy((caddr_t)ndp->ni_dent.d_name, (caddr_t)cfname,
	180	MAXCOMLEN);
	181	cfname[MAXCOMLEN] = '\0';
28db9b87 SL	182	goto again;
	183	}
	184
	185	/*
	186	* Collect arguments on "file" in swap space.
	187	*/
	188	na = 0;
	189	ne = 0;
	190	nc = 0;
f3aaea26	191	cc = 0;
28db9b87	192	uap = (struct execa *)u.u_ap;
9fd50f35 SL	193	bno = rmalloc(argmap, (long)ctod(clrnd((int)btoc(NCARGS))));
9fd50f35 SL	194	if (bno == 0) {
d03b3d84	195	swkill(u.u_procp, "exec: no swap space");
28db9b87 SL	196	goto bad;
	197	}
	198	if (bno % CLSIZE)
	199	panic("execa rmalloc");
f3aaea26 SL	200	/*
	201	* Copy arguments into file in argdev area.
	202	*/
28db9b87 SL	203	if (uap->argp) for (;;) {
28db9b87 SL	204	ap = NULL;
ce66cb03 MK	205	sharg = NULL;
	206	if (indir && na == 0) {
	207	sharg = cfname;
	208	ap = (int)sharg;
	209	uap->argp++; /* ignore argv[0] */
	210	} else if (indir && (na == 1 && cfarg[0])) {
	211	sharg = cfarg;
	212	ap = (int)sharg;
	213	} else if (indir && (na == 1 \|\| na == 2 && cfarg[0]))
28db9b87 SL	214	ap = (int)uap->fname;
	215	else if (uap->argp) {
	216	ap = fuword((caddr_t)uap->argp);
	217	uap->argp++;
	218	}
f3aaea26	219	if (ap == NULL && uap->envp) {
28db9b87	220	uap->argp = NULL;
f3aaea26 SL	221	if ((ap = fuword((caddr_t)uap->envp)) != NULL)
f3aaea26 SL	222	uap->envp++, ne++;
28db9b87 SL	223	}
	224	if (ap == NULL)
	225	break;
	226	na++;
f3aaea26	227	if (ap == -1) {
1daa95c7	228	u.u_error = EFAULT;
f3aaea26 SL	229	break;
f3aaea26 SL	230	}
28db9b87	231	do {
f3aaea26 SL	232	if (cc <= 0) {
	233	/*
	234	* We depend on NCARGS being a multiple of
	235	* CLSIZE*NBPG. This way we need only check
	236	* overflow before each buffer allocation.
	237	*/
	238	if (nc >= NCARGS-1) {
	239	error = E2BIG;
	240	break;
	241	}
28db9b87 SL	242	if (bp)
28db9b87 SL	243	bdwrite(bp);
f3aaea26 SL	244	cc = CLSIZE*NBPG;
f3aaea26 SL	245	bp = getblk(argdev, bno + ctod(nc/NBPG), cc);
28db9b87 SL	246	cp = bp->b_un.b_addr;
28db9b87 SL	247	}
ce66cb03	248	if (sharg) {
f3aaea26	249	error = copystr(sharg, cp, cc, &len);
ce66cb03 MK	250	sharg += len;
ce66cb03 MK	251	} else {
f3aaea26	252	error = copyinstr((caddr_t)ap, cp, cc, &len);
ce66cb03 MK	253	ap += len;
ce66cb03 MK	254	}
f3aaea26 SL	255	cp += len;
	256	nc += len;
	257	cc -= len;
	258	} while (error == ENOENT);
	259	if (error) {
	260	u.u_error = error;
	261	if (bp)
	262	brelse(bp);
	263	bp = 0;
	264	goto badarg;
	265	}
28db9b87 SL	266	}
	267	if (bp)
	268	bdwrite(bp);
	269	bp = 0;
	270	nc = (nc + NBPW-1) & ~(NBPW-1);
9fd50f35	271	getxfile(ip, &exdata.ex_exec, nc + (na+4)*NBPW, uid, gid);
28db9b87 SL	272	if (u.u_error) {
28db9b87 SL	273	badarg:
f3aaea26 SL	274	for (cc = 0; cc < nc; cc += CLSIZE*NBPG) {
f3aaea26 SL	275	bp = baddr(argdev, bno + ctod(cc/NBPG), CLSIZE*NBPG);
28db9b87 SL	276	if (bp) {
	277	bp->b_flags \|= B_AGE; /* throw away */
	278	bp->b_flags &= ~B_DELWRI; /* cancel io */
	279	brelse(bp);
	280	bp = 0;
	281	}
	282	}
	283	goto bad;
	284	}
ce66cb03 MK	285	iput(ip);
ce66cb03 MK	286	ip = NULL;
28db9b87 SL	287
28db9b87 SL	288	/*
f3aaea26	289	* Copy back arglist.
28db9b87 SL	290	*/
	291	ucp = USRSTACK - nc - NBPW;
	292	ap = ucp - naNBPW - 3NBPW;
	293	u.u_ar0[SP] = ap;
	294	(void) suword((caddr_t)ap, na-ne);
	295	nc = 0;
72d4f41a	296	cc = 0;
28db9b87 SL	297	for (;;) {
28db9b87 SL	298	ap += NBPW;
f3aaea26	299	if (na == ne) {
28db9b87 SL	300	(void) suword((caddr_t)ap, 0);
	301	ap += NBPW;
	302	}
	303	if (--na < 0)
	304	break;
	305	(void) suword((caddr_t)ap, ucp);
	306	do {
72d4f41a	307	if (cc <= 0) {
28db9b87 SL	308	if (bp)
28db9b87 SL	309	brelse(bp);
72d4f41a SL	310	cc = CLSIZE*NBPG;
72d4f41a SL	311	bp = bread(argdev, bno + ctod(nc / NBPG), cc);
28db9b87 SL	312	bp->b_flags \|= B_AGE; /* throw away */
	313	bp->b_flags &= ~B_DELWRI; /* cancel io */
	314	cp = bp->b_un.b_addr;
	315	}
72d4f41a SL	316	error = copyoutstr(cp, (caddr_t)ucp, cc, &len);
	317	ucp += len;
	318	cp += len;
	319	nc += len;
	320	cc -= len;
	321	} while (error == ENOENT);
	322	if (error == EFAULT)
	323	panic("exec: EFAULT");
28db9b87 SL	324	}
28db9b87 SL	325	(void) suword((caddr_t)ap, 0);
ce66cb03 MK	326
	327	/*
	328	* Reset caught signals. Held signals
	329	* remain held through p_sigmask.
	330	*/
	331	while (u.u_procp->p_sigcatch) {
	332	nc = ffs(u.u_procp->p_sigcatch);
	333	u.u_procp->p_sigcatch &= ~sigmask(nc);
	334	u.u_signal[nc] = SIG_DFL;
	335	}
	336	/*
	337	* Reset stack state to the user stack.
	338	* Clear set of signals caught on the signal stack.
	339	*/
	340	u.u_onstack = 0;
	341	u.u_sigsp = 0;
	342	u.u_sigonstack = 0;
	343
	344	for (nc = u.u_lastfile; nc >= 0; --nc) {
	345	if (u.u_pofile[nc] & UF_EXCLOSE) {
	346	closef(u.u_ofile[nc]);
	347	u.u_ofile[nc] = NULL;
	348	u.u_pofile[nc] = 0;
	349	}
	350	u.u_pofile[nc] &= ~UF_MAPPED;
	351	}
	352	while (u.u_lastfile >= 0 && u.u_ofile[u.u_lastfile] == NULL)
	353	u.u_lastfile--;
9fd50f35	354	setregs(exdata.ex_exec.a_entry);
715baff1 KM	355	/*
	356	* Remember file name for accounting.
	357	*/
	358	u.u_acflag &= ~AFORK;
ce66cb03 MK	359	if (indir)
	360	bcopy((caddr_t)cfname, (caddr_t)u.u_comm, MAXCOMLEN);
	361	else {
	362	if (ndp->ni_dent.d_namlen > MAXCOMLEN)
	363	ndp->ni_dent.d_namlen = MAXCOMLEN;
	364	bcopy((caddr_t)ndp->ni_dent.d_name, (caddr_t)u.u_comm,
	365	(unsigned)(ndp->ni_dent.d_namlen + 1));
	366	}
28db9b87 SL	367	bad:
	368	if (bp)
	369	brelse(bp);
	370	if (bno)
	371	rmfree(argmap, (long)ctod(clrnd((int) btoc(NCARGS))), bno);
ce66cb03 MK	372	if (ip)
ce66cb03 MK	373	iput(ip);
28db9b87 SL	374	}
	375
	376	/*
	377	* Read in and set up memory for executed file.
	378	*/
9fd50f35	379	getxfile(ip, ep, nargc, uid, gid)
28db9b87	380	register struct inode *ip;
9fd50f35	381	register struct exec *ep;
28db9b87 SL	382	int nargc, uid, gid;
28db9b87 SL	383	{
0c48b03e	384	size_t ts, ds, ids, uds, ss;
28db9b87 SL	385	int pagi;
28db9b87 SL	386
9fd50f35	387	if (ep->a_magic == 0413)
28db9b87 SL	388	pagi = SPAGI;
	389	else
	390	pagi = 0;
ce08d752 MK	391	if (ip->i_flag & IXMOD) { /* XXX */
	392	u.u_error = ETXTBSY;
	393	goto bad;
	394	}
9fd50f35 SL	395	if (ep->a_text != 0 && (ip->i_flag&ITEXT) == 0 &&
9fd50f35 SL	396	ip->i_count != 1) {
28db9b87 SL	397	register struct file *fp;
	398
	399	for (fp = file; fp < fileNFILE; fp++) {
	400	if (fp->f_type == DTYPE_INODE &&
	401	fp->f_count > 0 &&
	402	(struct inode *)fp->f_data == ip &&
	403	(fp->f_flag&FWRITE)) {
	404	u.u_error = ETXTBSY;
	405	goto bad;
	406	}
	407	}
	408	}
	409
	410	/*
	411	* Compute text and data sizes and make sure not too large.
0c48b03e KM	412	* NB - Check data and bss separately as they may overflow
0c48b03e KM	413	* when summed together.
28db9b87	414	*/
9fd50f35	415	ts = clrnd(btoc(ep->a_text));
0c48b03e KM	416	ids = clrnd(btoc(ep->a_data));
0c48b03e KM	417	uds = clrnd(btoc(ep->a_bss));
f3aaea26	418	ds = clrnd(btoc(ep->a_data + ep->a_bss));
28db9b87	419	ss = clrnd(SSIZE + btoc(nargc));
0c48b03e	420	if (chksize((unsigned)ts, (unsigned)ids, (unsigned)uds, (unsigned)ss))
28db9b87 SL	421	goto bad;
	422
	423	/*
	424	* Make sure enough space to start process.
	425	*/
	426	u.u_cdmap = zdmap;
	427	u.u_csmap = zdmap;
	428	if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL)
	429	goto bad;
	430
	431	/*
	432	* At this point, committed to the new image!
	433	* Release virtual memory resources of old process, and
	434	* initialize the virtual memory of the new process.
	435	* If we resulted from vfork(), instead wakeup our
	436	* parent who will set SVFDONE when he has taken back
	437	* our resources.
	438	*/
	439	if ((u.u_procp->p_flag & SVFORK) == 0)
	440	vrelvm();
	441	else {
	442	u.u_procp->p_flag &= ~SVFORK;
	443	u.u_procp->p_flag \|= SKEEP;
	444	wakeup((caddr_t)u.u_procp);
	445	while ((u.u_procp->p_flag & SVFDONE) == 0)
	446	sleep((caddr_t)u.u_procp, PZERO - 1);
	447	u.u_procp->p_flag &= ~(SVFDONE\|SKEEP);
	448	}
dd012d1e	449	u.u_procp->p_flag &= ~(SPAGI\|SSEQL\|SUANOM\|SOUSIG);
28db9b87 SL	450	u.u_procp->p_flag \|= pagi;
	451	u.u_dmap = u.u_cdmap;
	452	u.u_smap = u.u_csmap;
	453	vgetvm(ts, ds, ss);
	454
	455	if (pagi == 0)
	456	u.u_error =
	457	rdwri(UIO_READ, ip,
	458	(char *)ctob(dptov(u.u_procp, 0)),
9fd50f35 SL	459	(int)ep->a_data,
9fd50f35 SL	460	(int)(sizeof (struct exec) + ep->a_text),
28db9b87	461	0, (int *)0);
9fd50f35	462	xalloc(ip, ep, pagi);
28db9b87 SL	463	if (pagi && u.u_procp->p_textp)
	464	vinifod((struct fpte *)dptopte(u.u_procp, 0),
	465	PG_FTEXT, u.u_procp->p_textp->x_iptr,
9fd50f35	466	(long)(1 + ts/CLSIZE), (int)btoc(ep->a_data));
28db9b87 SL	467
	468	#ifdef vax
	469	/* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */
28db9b87 SL	470	mtpr(TBIA, 0);
	471	#endif
	472
	473	if (u.u_error)
d03b3d84	474	swkill(u.u_procp, "exec: I/O error mapping pages");
28db9b87 SL	475	/*
	476	* set SUID/SGID protections, if no tracing
	477	*/
	478	if ((u.u_procp->p_flag&STRC)==0) {
	479	u.u_uid = uid;
	480	u.u_procp->p_uid = uid;
	481	u.u_gid = gid;
	482	} else
	483	psignal(u.u_procp, SIGTRAP);
	484	u.u_tsize = ts;
	485	u.u_dsize = ds;
	486	u.u_ssize = ss;
d4a03a57	487	u.u_prof.pr_scale = 0;
28db9b87 SL	488	bad:
	489	return;
	490	}