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

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