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/*
* linux/ibcs/binfmt_script.c
*
* Copyright 1996 Mike Jagdis (jaggy@purplet.demon.co.uk)
*
* $Id: binfmt_script.c,v 1.1 1996/04/25 11:22:01 mike Exp $
* $Source: /usr/CVS/ibcs/iBCSemul/binfmt_script.c,v $
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/malloc.h>
#include <linux/binfmts.h>
static int load_script(struct linux_binprm *bprm,struct pt_regs *regs);
struct linux_binfmt ibcs_script_format = {
NULL, &mod_use_count_, load_script, NULL, NULL
};
static int
do_load_script(struct linux_binprm *bprm, struct pt_regs *regs)
{
char *sh_arg = "sh";
int retval;
if (bprm->sh_bang || (bprm->buf[0] == '#' && bprm->buf[1] == '!'))
return -ENOEXEC;
if ((bprm->buf[0] != ':')
|| (bprm->buf[1] != '\n' && bprm->buf[1] != ' ' && bprm->buf[1] != '\t')) {
/* Not an obvious script. If the header seems to consist
* of nothing but printable ASCII (plus nulls since the
* buffer was cleared initially and the script may be
* smaller) we will assume it is a script. This may break
* loaders below this one. Tough.
*/
int i;
for (i=0; i<sizeof(bprm->buf); i++)
if ((bprm->buf[i] < ' ' || bprm->buf[i] > '~')
&& bprm->buf[i] != '\0'
&& bprm->buf[i] != '\n'
&& bprm->buf[i] != '\t')
return -ENOEXEC;
}
bprm->sh_bang++;
iput(bprm->inode);
bprm->dont_iput=1;
remove_arg_zero(bprm);
bprm->p = copy_strings(1, &bprm->filename, bprm->page, bprm->p, 2);
bprm->argc++;
bprm->p = copy_strings(1, &sh_arg, bprm->page, bprm->p, 2);
bprm->argc++;
if (!bprm->p)
return -E2BIG;
retval = open_namei("/bin/sh", 0, 0, &bprm->inode, NULL);
if (retval)
return retval;
bprm->dont_iput=0;
retval=prepare_binprm(bprm);
if(retval<0)
return retval;
return search_binary_handler(bprm,regs);
}
static int load_script(struct linux_binprm *bprm,struct pt_regs *regs)
{
int retval;
MOD_INC_USE_COUNT;
retval = do_load_script(bprm,regs);
MOD_DEC_USE_COUNT;
return retval;
}
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