arch/alpha/kernel/binfmt_loader.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/init.h>
   3 #include <linux/fs.h>
   4 #include <linux/file.h>
   5 #include <linux/mm_types.h>
   6 #include <linux/binfmts.h>
   7 #include <linux/a.out.h>
   8
   9 static int load_binary(struct linux_binprm *bprm)
  10 {
  11         struct exec *eh = (struct exec *)bprm->buf;
  12         unsigned long loader;
  13         struct file *file;
  14         int retval;
  15
  16         if (eh->fh.f_magic != 0x183 || (eh->fh.f_flags & 0x3000) != 0x3000)
  17                 return -ENOEXEC;
  18
  19         if (bprm->loader)
  20                 return -ENOEXEC;
  21
  22         allow_write_access(bprm->file);
  23         fput(bprm->file);
  24         bprm->file = NULL;
  25
  26         loader = bprm->vma->vm_end - sizeof(void *);
  27
  28         file = open_exec("/sbin/loader");
  29         retval = PTR_ERR(file);
  30         if (IS_ERR(file))
  31                 return retval;
  32
  33         /* Remember if the application is TASO.  */
  34         bprm->taso = eh->ah.entry < 0x100000000UL;
  35
  36         bprm->file = file;
  37         bprm->loader = loader;
  38         retval = prepare_binprm(bprm);
  39         if (retval < 0)
  40                 return retval;
  41         return search_binary_handler(bprm);
  42 }
  43
  44 static struct linux_binfmt loader_format = {
  45         .load_binary    = load_binary,
  46 };
  47
  48 static int __init init_loader_binfmt(void)
  49 {
  50         insert_binfmt(&loader_format);
  51         return 0;
  52 }
  53 arch_initcall(init_loader_binfmt);