97 lines
1.9 KiB
C
97 lines
1.9 KiB
C
#include "param.h"
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#include "inode.h"
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#include "dir.h"
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#include "namei.h"
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#include "exec.h"
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#include "user.h"
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#include "systm.h"
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int
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exec_script_check(struct exec_params *epp)
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{
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char *cp;
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struct nameidata nd;
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struct nameidata *ndp;
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int error;
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struct inode *ip = 0;
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/*
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* We come here with the first line of the executable
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* script file.
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* Check is to see if it starts with the magic marker: #!
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*/
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if (epp->hdr.sh[0] != '#' || epp->hdr.sh[1] != '!' || epp->sh.interpreted)
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return ENOEXEC;
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epp->sh.interpreted = 1;
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/*
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* If setuid/gid scripts were to be disallowed this is where it would
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* have to be done.
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* u.u_uid = uid;
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* u.u_gid = u_groups[0];
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*/
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/*
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* The first line of the text file
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* should be one line on the format:
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* #! <interpreter-name> <interpreter-argument>\n
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*/
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cp = &epp->hdr.sh[2];
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while (cp < &epp->hdr.sh[MIN(epp->hdr_len, SHSIZE)]) {
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if (*cp == '\t')
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*cp = ' ';
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else if (*cp == '\n') {
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*cp = '\0';
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break;
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}
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cp++;
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}
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if (cp == &epp->hdr.sh[MIN(epp->hdr_len, SHSIZE)])
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return ENOEXEC;
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/*
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* Pick up script interpreter file name
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*/
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cp = &epp->hdr.sh[2];
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while (*cp == ' ')
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cp++;
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if (!*cp)
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return ENOEXEC;
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bzero(&nd, sizeof nd);
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ndp = &nd;
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ndp->ni_dirp = cp;
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while (*cp && *cp != ' ')
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cp++;
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if (*cp != '\0') {
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*cp++ = 0;
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while (*cp && *cp == ' ')
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cp++;
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if (*cp) {
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if ((error = copystr(cp, epp->sh.interparg, sizeof epp->sh.interparg, NULL)))
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goto done;
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}
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}
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/*
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* the interpreter is the new file to exec
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*/
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ndp->ni_nameiop = LOOKUP | FOLLOW;
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ip = namei (ndp);
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if (ip == NULL)
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return u.u_error;
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if ((error = copystr(ndp->ni_dent.d_name, epp->sh.interpname, sizeof epp->sh.interpname, NULL)))
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goto done;
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/*
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* Everything set up, do the recursive exec()
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*/
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if (epp->ip)
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iput(epp->ip);
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epp->ip = ip;
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error = exec_check(epp);
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done:
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if (ip)
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iput(ip);
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return error;
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}
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