binfmt_script.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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)
   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                 return -ENOEXEC;
   27         /*
   28          * This section does the #! interpretation.
   29          * Sorta complicated, but hopefully it will work.  -TYT
   30          */
   31 
   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 = NULL;
   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         retval = remove_arg_zero(bprm);
   70         if (retval)
   71                 return retval;
   72         retval = copy_strings_kernel(1, &bprm->interp, bprm);
   73         if (retval < 0) return retval; 
   74         bprm->argc++;
   75         if (i_arg) {
   76                 retval = copy_strings_kernel(1, &i_arg, bprm);
   77                 if (retval < 0) return retval; 
   78                 bprm->argc++;
   79         }
   80         retval = copy_strings_kernel(1, &i_name, bprm);
   81         if (retval) return retval; 
   82         bprm->argc++;
   83         retval = bprm_change_interp(interp, bprm);
   84         if (retval < 0)
   85                 return retval;
   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);
   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");

Cache object: 9c9db6abffe0c1a80ae48aca24007bbf

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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