1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun #include <linux/init.h> 3*4882a593Smuzhiyun #include <linux/fs.h> 4*4882a593Smuzhiyun #include <linux/file.h> 5*4882a593Smuzhiyun #include <linux/mm_types.h> 6*4882a593Smuzhiyun #include <linux/binfmts.h> 7*4882a593Smuzhiyun #include <linux/a.out.h> 8*4882a593Smuzhiyun load_binary(struct linux_binprm * bprm)9*4882a593Smuzhiyunstatic int load_binary(struct linux_binprm *bprm) 10*4882a593Smuzhiyun { 11*4882a593Smuzhiyun struct exec *eh = (struct exec *)bprm->buf; 12*4882a593Smuzhiyun unsigned long loader; 13*4882a593Smuzhiyun struct file *file; 14*4882a593Smuzhiyun int retval; 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun if (eh->fh.f_magic != 0x183 || (eh->fh.f_flags & 0x3000) != 0x3000) 17*4882a593Smuzhiyun return -ENOEXEC; 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun if (bprm->loader) 20*4882a593Smuzhiyun return -ENOEXEC; 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun loader = bprm->vma->vm_end - sizeof(void *); 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun file = open_exec("/sbin/loader"); 25*4882a593Smuzhiyun retval = PTR_ERR(file); 26*4882a593Smuzhiyun if (IS_ERR(file)) 27*4882a593Smuzhiyun return retval; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun /* Remember if the application is TASO. */ 30*4882a593Smuzhiyun bprm->taso = eh->ah.entry < 0x100000000UL; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun bprm->interpreter = file; 33*4882a593Smuzhiyun bprm->loader = loader; 34*4882a593Smuzhiyun return 0; 35*4882a593Smuzhiyun } 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun static struct linux_binfmt loader_format = { 38*4882a593Smuzhiyun .load_binary = load_binary, 39*4882a593Smuzhiyun }; 40*4882a593Smuzhiyun init_loader_binfmt(void)41*4882a593Smuzhiyunstatic int __init init_loader_binfmt(void) 42*4882a593Smuzhiyun { 43*4882a593Smuzhiyun insert_binfmt(&loader_format); 44*4882a593Smuzhiyun return 0; 45*4882a593Smuzhiyun } 46*4882a593Smuzhiyun arch_initcall(init_loader_binfmt); 47