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1 /* 1 /*
2 * linux/fs/binfmt_script.c 2 * linux/fs/binfmt_script.c
3 * 3 *
4 * Copyright (C) 1996 Martin von Löwis !! 4 * Copyright (C) 1996 Martin von Löwis
5 * original #!-checking implemented by tytso. 5 * original #!-checking implemented by tytso.
6 */ 6 */
7 7
8 #include <linux/module.h> 8 #include <linux/module.h>
9 #include <linux/string.h> 9 #include <linux/string.h>
10 #include <linux/stat.h> 10 #include <linux/stat.h>
11 #include <linux/slab.h> 11 #include <linux/slab.h>
12 #include <linux/binfmts.h> 12 #include <linux/binfmts.h>
13 #include <linux/init.h> 13 #include <linux/init.h>
14 #include <linux/file.h> 14 #include <linux/file.h>
>> 15 #include <linux/smp_lock.h>
15 #include <linux/err.h> 16 #include <linux/err.h>
16 #include <linux/fs.h> 17 #include <linux/fs.h>
17 18
18 static int load_script(struct linux_binprm *bp 19 static int load_script(struct linux_binprm *bprm,struct pt_regs *regs)
19 { 20 {
20 char *cp, *i_name, *i_arg; 21 char *cp, *i_name, *i_arg;
21 struct file *file; 22 struct file *file;
22 char interp[BINPRM_BUF_SIZE]; 23 char interp[BINPRM_BUF_SIZE];
23 int retval; 24 int retval;
24 25
25 if ((bprm->buf[0] != '#') || (bprm->bu !! 26 if ((bprm->buf[0] != '#') || (bprm->buf[1] != '!') || (bprm->sh_bang))
26 (bprm->recursion_depth > BINPRM_MA <<
27 return -ENOEXEC; 27 return -ENOEXEC;
28 /* 28 /*
29 * This section does the #! interpreta 29 * This section does the #! interpretation.
30 * Sorta complicated, but hopefully it 30 * Sorta complicated, but hopefully it will work. -TYT
31 */ 31 */
32 32
33 bprm->recursion_depth++; !! 33 bprm->sh_bang++;
34 allow_write_access(bprm->file); 34 allow_write_access(bprm->file);
35 fput(bprm->file); 35 fput(bprm->file);
36 bprm->file = NULL; 36 bprm->file = NULL;
37 37
38 bprm->buf[BINPRM_BUF_SIZE - 1] = '\0'; 38 bprm->buf[BINPRM_BUF_SIZE - 1] = '\0';
39 if ((cp = strchr(bprm->buf, '\n')) == 39 if ((cp = strchr(bprm->buf, '\n')) == NULL)
40 cp = bprm->buf+BINPRM_BUF_SIZE 40 cp = bprm->buf+BINPRM_BUF_SIZE-1;
41 *cp = '\0'; 41 *cp = '\0';
42 while (cp > bprm->buf) { 42 while (cp > bprm->buf) {
43 cp--; 43 cp--;
44 if ((*cp == ' ') || (*cp == '\ 44 if ((*cp == ' ') || (*cp == '\t'))
45 *cp = '\0'; 45 *cp = '\0';
46 else 46 else
47 break; 47 break;
48 } 48 }
49 for (cp = bprm->buf+2; (*cp == ' ') || 49 for (cp = bprm->buf+2; (*cp == ' ') || (*cp == '\t'); cp++);
50 if (*cp == '\0') 50 if (*cp == '\0')
51 return -ENOEXEC; /* No interpr 51 return -ENOEXEC; /* No interpreter name found */
52 i_name = cp; 52 i_name = cp;
53 i_arg = NULL; 53 i_arg = NULL;
54 for ( ; *cp && (*cp != ' ') && (*cp != 54 for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++)
55 /* nothing */ ; 55 /* nothing */ ;
56 while ((*cp == ' ') || (*cp == '\t')) 56 while ((*cp == ' ') || (*cp == '\t'))
57 *cp++ = '\0'; 57 *cp++ = '\0';
58 if (*cp) 58 if (*cp)
59 i_arg = cp; 59 i_arg = cp;
60 strcpy (interp, i_name); 60 strcpy (interp, i_name);
61 /* 61 /*
62 * OK, we've parsed out the interprete 62 * OK, we've parsed out the interpreter name and
63 * (optional) argument. 63 * (optional) argument.
64 * Splice in (1) the interpreter's nam 64 * Splice in (1) the interpreter's name for argv[0]
65 * (2) (optional) argument t 65 * (2) (optional) argument to interpreter
66 * (3) filename of shell scr 66 * (3) filename of shell script (replace argv[0])
67 * 67 *
68 * This is done in reverse order, beca 68 * This is done in reverse order, because of how the
69 * user environment and arguments are 69 * user environment and arguments are stored.
70 */ 70 */
71 retval = remove_arg_zero(bprm); !! 71 remove_arg_zero(bprm);
72 if (retval) <<
73 return retval; <<
74 retval = copy_strings_kernel(1, &bprm- 72 retval = copy_strings_kernel(1, &bprm->interp, bprm);
75 if (retval < 0) return retval; 73 if (retval < 0) return retval;
76 bprm->argc++; 74 bprm->argc++;
77 if (i_arg) { 75 if (i_arg) {
78 retval = copy_strings_kernel(1 76 retval = copy_strings_kernel(1, &i_arg, bprm);
79 if (retval < 0) return retval; 77 if (retval < 0) return retval;
80 bprm->argc++; 78 bprm->argc++;
81 } 79 }
82 retval = copy_strings_kernel(1, &i_nam 80 retval = copy_strings_kernel(1, &i_name, bprm);
83 if (retval) return retval; 81 if (retval) return retval;
84 bprm->argc++; 82 bprm->argc++;
85 bprm->interp = interp; 83 bprm->interp = interp;
86 84
87 /* 85 /*
88 * OK, now restart the process with th 86 * OK, now restart the process with the interpreter's dentry.
89 */ 87 */
90 file = open_exec(interp); 88 file = open_exec(interp);
91 if (IS_ERR(file)) 89 if (IS_ERR(file))
92 return PTR_ERR(file); 90 return PTR_ERR(file);
93 91
94 bprm->file = file; 92 bprm->file = file;
95 retval = prepare_binprm(bprm); 93 retval = prepare_binprm(bprm);
96 if (retval < 0) 94 if (retval < 0)
97 return retval; 95 return retval;
98 return search_binary_handler(bprm,regs 96 return search_binary_handler(bprm,regs);
99 } 97 }
100 98
101 static struct linux_binfmt script_format = { 99 static struct linux_binfmt script_format = {
102 .module = THIS_MODULE, 100 .module = THIS_MODULE,
103 .load_binary = load_script, 101 .load_binary = load_script,
104 }; 102 };
105 103
106 static int __init init_script_binfmt(void) 104 static int __init init_script_binfmt(void)
107 { 105 {
108 return register_binfmt(&script_format) 106 return register_binfmt(&script_format);
109 } 107 }
110 108
111 static void __exit exit_script_binfmt(void) 109 static void __exit exit_script_binfmt(void)
112 { 110 {
113 unregister_binfmt(&script_format); 111 unregister_binfmt(&script_format);
114 } 112 }
115 113
116 core_initcall(init_script_binfmt); 114 core_initcall(init_script_binfmt);
117 module_exit(exit_script_binfmt); 115 module_exit(exit_script_binfmt);
118 MODULE_LICENSE("GPL"); 116 MODULE_LICENSE("GPL");
119 117
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