patch-1.3.71 linux/fs/binfmt_script.c

• Lines: 129
• Date: Sat Mar 2 13:18:47 1996
• Orig file: v1.3.70/linux/fs/binfmt_script.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.70/linux/fs/binfmt_script.c linux/fs/binfmt_script.c
@@ -0,0 +1,128 @@
+/*
+ *  linux/fs/binfmt_script.c
+ *
+ *  Copyright (C) 1996  Martin von Löwis
+ *  original #!-checking implemented by tytso.
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/malloc.h>
+#include <linux/binfmts.h>
+
+static int do_load_script(struct linux_binprm *bprm,struct pt_regs *regs)
+{
+	char *cp, *interp, *i_name, *i_arg, *page;
+	int retval, offset;
+	if ((bprm->buf[0] != '#') || (bprm->buf[1] != '!') || (bprm->sh_bang)) 
+		return -ENOEXEC;
+	/*
+	 * This section does the #! interpretation.
+	 * Sorta complicated, but hopefully it will work.  -TYT
+	 */
+
+	bprm->sh_bang++;
+	iput(bprm->inode);
+	bprm->dont_iput=1;
+
+	bprm->buf[127] = '\0';
+	if ((cp = strchr(bprm->buf, '\n')) == NULL)
+		cp = bprm->buf+127;
+	*cp = '\0';
+	while (cp > bprm->buf) {
+		cp--;
+		if ((*cp == ' ') || (*cp == '\t'))
+			*cp = '\0';
+		else
+			break;
+	}
+	for (cp = bprm->buf+2; (*cp == ' ') || (*cp == '\t'); cp++);
+	if (!cp || *cp == '\0') 
+		return -ENOEXEC; /* No interpreter name found */
+	interp = i_name = cp;
+	i_arg = 0;
+	for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++) {
+ 		if (*cp == '/')
+			i_name = cp+1;
+	}
+	while ((*cp == ' ') || (*cp == '\t'))
+		*cp++ = '\0';
+	if (*cp)
+		i_arg = cp;
+	/*
+	 * OK, we've parsed out the interpreter name and
+	 * (optional) argument.
+	 * Splice in (1) the interpreter's name for argv[0]
+	 *           (2) (optional) argument to interpreter
+	 *           (3) filename of shell script (replace argv[0])
+	 *
+	 * This is done in reverse order, because of how the
+	 * user environment and arguments are stored.
+	 */
+	if (bprm->argc) {
+		offset = bprm->p % PAGE_SIZE;
+		page = (char*)bprm->page[bprm->p/PAGE_SIZE];
+		while(bprm->p++,*(page+offset++))
+			if(offset==PAGE_SIZE){
+				offset=0;
+				page = (char*)bprm->page[bprm->p/PAGE_SIZE];
+			}
+		bprm->argc--;
+	}
+	bprm->p = copy_strings(1, &bprm->filename, bprm->page, bprm->p, 2);
+	bprm->argc++;
+	if (i_arg) {
+		bprm->p = copy_strings(1, &i_arg, bprm->page, bprm->p, 2);
+		bprm->argc++;
+	}
+	bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2);
+	bprm->argc++;
+	if (!bprm->p) 
+		return -E2BIG;
+	/*
+	 * OK, now restart the process with the interpreter's inode.
+	 * Note that we use open_namei() as the name is now in kernel
+	 * space, and we don't need to copy it.
+	 */
+	retval = open_namei(interp, 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;
+}
+
+struct linux_binfmt script_format = {
+#ifndef MODULE
+	NULL, 0, load_script, NULL, NULL
+#else
+	NULL, &mod_use_count_, load_script, NULL, NULL
+#endif
+};
+
+int init_script_binfmt(void) {
+	return register_binfmt(&script_format);
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	return init_script_binfmt();
+}
+
+void cleanup_module( void) {
+	unregister_binfmt(&script_format);
+}
+#endif