binfmt_em86.c

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    1 /*
    2  *  linux/fs/binfmt_em86.c
    3  *
    4  *  Based on linux/fs/binfmt_script.c
    5  *  Copyright (C) 1996  Martin von Löwis
    6  *  original #!-checking implemented by tytso.
    7  *
    8  *  em86 changes Copyright (C) 1997  Jim Paradis
    9  */
   10 
   11 #include <linux/module.h>
   12 #include <linux/string.h>
   13 #include <linux/stat.h>
   14 #include <linux/binfmts.h>
   15 #include <linux/elf.h>
   16 #include <linux/init.h>
   17 #include <linux/fs.h>
   18 #include <linux/file.h>
   19 #include <linux/errno.h>
   20 
   21 
   22 #define EM86_INTERP     "/usr/bin/em86"
   23 #define EM86_I_NAME     "em86"
   24 
   25 static int load_em86(struct linux_binprm *bprm)
   26 {
   27         char *interp, *i_name, *i_arg;
   28         struct file * file;
   29         int retval;
   30         struct elfhdr   elf_ex;
   31 
   32         /* Make sure this is a Linux/Intel ELF executable... */
   33         elf_ex = *((struct elfhdr *)bprm->buf);
   34 
   35         if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
   36                 return  -ENOEXEC;
   37 
   38         /* First of all, some simple consistency checks */
   39         if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
   40                 (!((elf_ex.e_machine == EM_386) || (elf_ex.e_machine == EM_486))) ||
   41                 (!bprm->file->f_op || !bprm->file->f_op->mmap)) {
   42                         return -ENOEXEC;
   43         }
   44 
   45         allow_write_access(bprm->file);
   46         fput(bprm->file);
   47         bprm->file = NULL;
   48 
   49         /* Unlike in the script case, we don't have to do any hairy
   50          * parsing to find our interpreter... it's hardcoded!
   51          */
   52         interp = EM86_INTERP;
   53         i_name = EM86_I_NAME;
   54         i_arg = NULL;           /* We reserve the right to add an arg later */
   55 
   56         /*
   57          * Splice in (1) the interpreter's name for argv[0]
   58          *           (2) (optional) argument to interpreter
   59          *           (3) filename of emulated file (replace argv[0])
   60          *
   61          * This is done in reverse order, because of how the
   62          * user environment and arguments are stored.
   63          */
   64         remove_arg_zero(bprm);
   65         retval = copy_strings_kernel(1, &bprm->filename, bprm);
   66         if (retval < 0) return retval; 
   67         bprm->argc++;
   68         if (i_arg) {
   69                 retval = copy_strings_kernel(1, &i_arg, bprm);
   70                 if (retval < 0) return retval; 
   71                 bprm->argc++;
   72         }
   73         retval = copy_strings_kernel(1, &i_name, bprm);
   74         if (retval < 0) return retval;
   75         bprm->argc++;
   76 
   77         /*
   78          * OK, now restart the process with the interpreter's inode.
   79          * Note that we use open_exec() as the name is now in kernel
   80          * space, and we don't need to copy it.
   81          */
   82         file = open_exec(interp);
   83         if (IS_ERR(file))
   84                 return PTR_ERR(file);
   85 
   86         bprm->file = file;
   87 
   88         retval = prepare_binprm(bprm);
   89         if (retval < 0)
   90                 return retval;
   91 
   92         return search_binary_handler(bprm);
   93 }
   94 
   95 static struct linux_binfmt em86_format = {
   96         .module         = THIS_MODULE,
   97         .load_binary    = load_em86,
   98 };
   99 
  100 static int __init init_em86_binfmt(void)
  101 {
  102         register_binfmt(&em86_format);
  103         return 0;
  104 }
  105 
  106 static void __exit exit_em86_binfmt(void)
  107 {
  108         unregister_binfmt(&em86_format);
  109 }
  110 
  111 core_initcall(init_em86_binfmt);
  112 module_exit(exit_em86_binfmt);
  113 MODULE_LICENSE("GPL");

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FreeBSD/Linux Kernel Cross Reference sys/fs/binfmt_em86.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/binfmt_em86.c