// SPDX-License-Identifier: GPL-2.0 #include <linux/init.h> #include <linux/fs.h> #include <linux/file.h> #include <linux/mm_types.h> #include <linux/binfmts.h> #include <linux/a.out.h> static int load_binary(struct linux_binprm *bprm) { struct exec *eh = (struct exec *)bprm->buf; unsigned long loader; struct file *file; int retval; if (eh->fh.f_magic != 0x183 || (eh->fh.f_flags & 0x3000) != 0x3000) return -ENOEXEC; if (bprm->loader) return -ENOEXEC; allow_write_access(bprm->file); fput(bprm->file); bprm->file = NULL; loader = bprm->vma->vm_end - sizeof(void *); file = open_exec("/sbin/loader"); retval = PTR_ERR(file); if (IS_ERR(file)) return retval; /* Remember if the application is TASO. */ bprm->taso = eh->ah.entry < 0x100000000UL; bprm->file = file; bprm->loader = loader; retval = prepare_binprm(bprm); if (retval < 0) return retval; return search_binary_handler(bprm); } static struct linux_binfmt loader_format = { .load_binary = load_binary, }; static int __init init_loader_binfmt(void) { insert_binfmt(&loader_format); return 0; } arch_initcall(init_loader_binfmt);