path: root/fs/binfmt_elf_fdpic.c

/* binfmt_elf_fdpic.c: FDPIC ELF binary format
 *
 * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * Derived from binfmt_elf.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>

#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/binfmts.h>
#include <linux/string.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/personality.h>
#include <linux/ptrace.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/elf.h>
#include <linux/elf-fdpic.h>
#include <linux/elfcore.h>

#include <asm/uaccess.h>
#include <asm/param.h>
#include <asm/pgalloc.h>

typedef char *elf_caddr_t;
#ifndef elf_addr_t
#define elf_addr_t unsigned long
#endif

#if 0
#define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
#else
#define kdebug(fmt, ...) do {} while(0)
#endif

MODULE_LICENSE("GPL");

static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs);
//static int load_elf_fdpic_library(struct file *);
static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, struct file *file);
static int elf_fdpic_map_file(struct elf_fdpic_params *params,
			      struct file *file,
			      struct mm_struct *mm,
			      const char *what);

static int create_elf_fdpic_tables(struct linux_binprm *bprm,
				   struct mm_struct *mm,
				   struct elf_fdpic_params *exec_params,
				   struct elf_fdpic_params *interp_params);

#ifndef CONFIG_MMU
static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, unsigned long *_sp);
static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *params,
						   struct file *file,
						   struct mm_struct *mm);
#endif

static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
					     struct file *file,
					     struct mm_struct *mm);

static struct linux_binfmt elf_fdpic_format = {
	.module		= THIS_MODULE,
	.load_binary	= load_elf_fdpic_binary,
//	.load_shlib	= load_elf_fdpic_library,
//	.core_dump	= elf_fdpic_core_dump,
	.min_coredump	= ELF_EXEC_PAGESIZE,
};

static int __init init_elf_fdpic_binfmt(void)  { return register_binfmt(&elf_fdpic_format); }
static void __exit exit_elf_fdpic_binfmt(void) { unregister_binfmt(&elf_fdpic_format); }

module_init(init_elf_fdpic_binfmt)
module_exit(exit_elf_fdpic_binfmt)

static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
{
	if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
		return 0;
	if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
		return 0;
	if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr))
		return 0;
	if (!file->f_op || !file->f_op->mmap)
		return 0;
	return 1;
}

/*****************************************************************************/
/*
 * read the program headers table into memory
 */
static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, struct file *file)
{
	struct elf32_phdr *phdr;
	unsigned long size;
	int retval, loop;

	if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
		return -ENOMEM;
	if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
		return -ENOMEM;

	size = params->hdr.e_phnum * sizeof(struct elf_phdr);
	params->phdrs = kmalloc(size, GFP_KERNEL);
	if (!params->phdrs)
		return -ENOMEM;

	retval = kernel_read(file, params->hdr.e_phoff, (char *) params->phdrs, size);
	if