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Source at commit 2604e7f9a98c27be50a0c3ff7503b6a5ea8f6cfe created 12 years 7 months ago. By Maarten ter Huurne, cpufreq_stats: Support runtime changes to frequency table | |
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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 | const char *i_arg, *i_name; |
20 | char *cp; |
21 | struct file *file; |
22 | char interp[BINPRM_BUF_SIZE]; |
23 | int retval; |
24 | |
25 | if ((bprm->buf[0] != '#') || (bprm->buf[1] != '!') || |
26 | (bprm->recursion_depth > BINPRM_MAX_RECURSION)) |
27 | return -ENOEXEC; |
28 | /* |
29 | * This section does the #! interpretation. |
30 | * Sorta complicated, but hopefully it will work. -TYT |
31 | */ |
32 | |
33 | bprm->recursion_depth++; |
34 | allow_write_access(bprm->file); |
35 | fput(bprm->file); |
36 | bprm->file = NULL; |
37 | |
38 | bprm->buf[BINPRM_BUF_SIZE - 1] = '\0'; |
39 | if ((cp = strchr(bprm->buf, '\n')) == NULL) |
40 | cp = bprm->buf+BINPRM_BUF_SIZE-1; |
41 | *cp = '\0'; |
42 | while (cp > bprm->buf) { |
43 | cp--; |
44 | if ((*cp == ' ') || (*cp == '\t')) |
45 | *cp = '\0'; |
46 | else |
47 | break; |
48 | } |
49 | for (cp = bprm->buf+2; (*cp == ' ') || (*cp == '\t'); cp++); |
50 | if (*cp == '\0') |
51 | return -ENOEXEC; /* No interpreter name found */ |
52 | i_name = cp; |
53 | i_arg = NULL; |
54 | for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++) |
55 | /* nothing */ ; |
56 | while ((*cp == ' ') || (*cp == '\t')) |
57 | *cp++ = '\0'; |
58 | if (*cp) |
59 | i_arg = cp; |
60 | strcpy (interp, i_name); |
61 | /* |
62 | * OK, we've parsed out the interpreter name and |
63 | * (optional) argument. |
64 | * Splice in (1) the interpreter's name for argv[0] |
65 | * (2) (optional) argument to interpreter |
66 | * (3) filename of shell script (replace argv[0]) |
67 | * |
68 | * This is done in reverse order, because of how the |
69 | * user environment and arguments are stored. |
70 | */ |
71 | retval = remove_arg_zero(bprm); |
72 | if (retval) |
73 | return retval; |
74 | retval = copy_strings_kernel(1, &bprm->interp, bprm); |
75 | if (retval < 0) return retval; |
76 | bprm->argc++; |
77 | if (i_arg) { |
78 | retval = copy_strings_kernel(1, &i_arg, bprm); |
79 | if (retval < 0) return retval; |
80 | bprm->argc++; |
81 | } |
82 | retval = copy_strings_kernel(1, &i_name, bprm); |
83 | if (retval) return retval; |
84 | bprm->argc++; |
85 | bprm->interp = interp; |
86 | |
87 | /* |
88 | * OK, now restart the process with the interpreter's dentry. |
89 | */ |
90 | file = open_exec(interp); |
91 | if (IS_ERR(file)) |
92 | return PTR_ERR(file); |
93 | |
94 | bprm->file = file; |
95 | retval = prepare_binprm(bprm); |
96 | if (retval < 0) |
97 | return retval; |
98 | return search_binary_handler(bprm,regs); |
99 | } |
100 | |
101 | static struct linux_binfmt script_format = { |
102 | .module = THIS_MODULE, |
103 | .load_binary = load_script, |
104 | }; |
105 | |
106 | static int __init init_script_binfmt(void) |
107 | { |
108 | register_binfmt(&script_format); |
109 | return 0; |
110 | } |
111 | |
112 | static void __exit exit_script_binfmt(void) |
113 | { |
114 | unregister_binfmt(&script_format); |
115 | } |
116 | |
117 | core_initcall(init_script_binfmt); |
118 | module_exit(exit_script_binfmt); |
119 | MODULE_LICENSE("GPL"); |
120 |
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