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