The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/binfmt_script.c

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

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