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119 lines
2.7 KiB
119 lines
2.7 KiB
/* |
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* linux/fs/binfmt_script.c |
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* |
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* Copyright (C) 1996 Martin von Löwis |
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* original #!-checking implemented by tytso. |
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*/ |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <linux/stat.h> |
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#include <linux/binfmts.h> |
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#include <linux/init.h> |
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#include <linux/file.h> |
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#include <linux/err.h> |
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#include <linux/fs.h> |
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static int load_script(struct linux_binprm *bprm) |
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{ |
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const char *i_arg, *i_name; |
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char *cp; |
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struct file *file; |
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char interp[BINPRM_BUF_SIZE]; |
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int retval; |
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if ((bprm->buf[0] != '#') || (bprm->buf[1] != '!')) |
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return -ENOEXEC; |
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/* |
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* This section does the #! interpretation. |
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* Sorta complicated, but hopefully it will work. -TYT |
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*/ |
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allow_write_access(bprm->file); |
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fput(bprm->file); |
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bprm->file = NULL; |
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bprm->buf[BINPRM_BUF_SIZE - 1] = '\0'; |
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if ((cp = strchr(bprm->buf, '\n')) == NULL) |
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cp = bprm->buf+BINPRM_BUF_SIZE-1; |
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*cp = '\0'; |
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while (cp > bprm->buf) { |
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cp--; |
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if ((*cp == ' ') || (*cp == '\t')) |
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*cp = '\0'; |
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else |
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break; |
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} |
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for (cp = bprm->buf+2; (*cp == ' ') || (*cp == '\t'); cp++); |
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if (*cp == '\0') |
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return -ENOEXEC; /* No interpreter name found */ |
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i_name = cp; |
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i_arg = NULL; |
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for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++) |
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/* nothing */ ; |
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while ((*cp == ' ') || (*cp == '\t')) |
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*cp++ = '\0'; |
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if (*cp) |
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i_arg = cp; |
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strcpy (interp, i_name); |
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/* |
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* OK, we've parsed out the interpreter name and |
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* (optional) argument. |
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* Splice in (1) the interpreter's name for argv[0] |
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* (2) (optional) argument to interpreter |
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* (3) filename of shell script (replace argv[0]) |
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* |
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* This is done in reverse order, because of how the |
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* user environment and arguments are stored. |
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*/ |
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retval = remove_arg_zero(bprm); |
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if (retval) |
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return retval; |
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retval = copy_strings_kernel(1, &bprm->interp, bprm); |
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if (retval < 0) return retval; |
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bprm->argc++; |
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if (i_arg) { |
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retval = copy_strings_kernel(1, &i_arg, bprm); |
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if (retval < 0) return retval; |
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bprm->argc++; |
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} |
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retval = copy_strings_kernel(1, &i_name, bprm); |
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if (retval) return retval; |
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bprm->argc++; |
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retval = bprm_change_interp(interp, bprm); |
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if (retval < 0) |
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return retval; |
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/* |
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* OK, now restart the process with the interpreter's dentry. |
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*/ |
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file = open_exec(interp); |
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if (IS_ERR(file)) |
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return PTR_ERR(file); |
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bprm->file = file; |
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retval = prepare_binprm(bprm); |
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if (retval < 0) |
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return retval; |
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return search_binary_handler(bprm); |
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} |
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static struct linux_binfmt script_format = { |
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.module = THIS_MODULE, |
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.load_binary = load_script, |
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}; |
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static int __init init_script_binfmt(void) |
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{ |
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register_binfmt(&script_format); |
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return 0; |
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} |
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static void __exit exit_script_binfmt(void) |
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{ |
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unregister_binfmt(&script_format); |
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} |
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core_initcall(init_script_binfmt); |
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module_exit(exit_script_binfmt); |
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MODULE_LICENSE("GPL");
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