mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-30 04:22:44 +00:00
1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
243 lines
7.0 KiB
C
243 lines
7.0 KiB
C
/*-
|
|
* Copyright (c) 1994-1996 Søren Schmidt
|
|
* All rights reserved.
|
|
*
|
|
* Based heavily on /sys/kern/imgact_aout.c which is:
|
|
* Copyright (c) 1993, David Greenman
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer
|
|
* in this position and unchanged.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software withough specific prior written permission
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef LKM
|
|
#include "opt_rlimit.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/imgact.h>
|
|
#include <sys/imgact_aout.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/lock.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_prot.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
#include <i386/linux/linux.h>
|
|
#include <i386/linux/linux_proto.h>
|
|
|
|
extern int exec_linux_imgact __P((struct image_params *iparams));
|
|
|
|
int
|
|
exec_linux_imgact(imgp)
|
|
struct image_params *imgp;
|
|
{
|
|
const struct exec *a_out = (const struct exec *) imgp->image_header;
|
|
struct vmspace *vmspace = imgp->proc->p_vmspace;
|
|
vm_offset_t vmaddr;
|
|
unsigned long virtual_offset, file_offset;
|
|
vm_offset_t buffer;
|
|
unsigned long bss_size;
|
|
int error;
|
|
|
|
if (((a_out->a_magic >> 16) & 0xff) != 0x64)
|
|
return -1;
|
|
|
|
/*
|
|
* Set file/virtual offset based on a.out variant.
|
|
*/
|
|
switch ((int)(a_out->a_magic & 0xffff)) {
|
|
case 0413:
|
|
virtual_offset = 0;
|
|
file_offset = 1024;
|
|
break;
|
|
case 0314:
|
|
virtual_offset = 4096;
|
|
file_offset = 0;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
bss_size = round_page(a_out->a_bss);
|
|
#ifdef DEBUG
|
|
printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, a_out->a_data, bss_size);
|
|
#endif
|
|
|
|
/*
|
|
* Check various fields in header for validity/bounds.
|
|
*/
|
|
if (a_out->a_entry < virtual_offset ||
|
|
a_out->a_entry >= virtual_offset + a_out->a_text ||
|
|
a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
|
|
return (-1);
|
|
|
|
/* text + data can't exceed file size */
|
|
if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
|
|
return (EFAULT);
|
|
/*
|
|
* text/data/bss must not exceed limits
|
|
*/
|
|
if (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ ||
|
|
a_out->a_data+bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
|
|
return (ENOMEM);
|
|
|
|
/* copy in arguments and/or environment from old process */
|
|
error = exec_extract_strings(imgp);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Destroy old process VM and create a new one (with a new stack)
|
|
*/
|
|
exec_new_vmspace(imgp);
|
|
|
|
/*
|
|
* Check if file_offset page aligned,.
|
|
* Currently we cannot handle misalinged file offsets,
|
|
* and so we read in the entire image (what a waste).
|
|
*/
|
|
if (file_offset & PAGE_MASK) {
|
|
#ifdef DEBUG
|
|
printf("imgact: Non page aligned binary %d\n", file_offset);
|
|
#endif
|
|
/*
|
|
* Map text+data+bss read/write/execute
|
|
*/
|
|
vmaddr = virtual_offset;
|
|
error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
|
|
a_out->a_text + a_out->a_data + bss_size, FALSE,
|
|
VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
error = vm_mmap(kernel_map, &buffer,
|
|
round_page(a_out->a_text + a_out->a_data + file_offset),
|
|
VM_PROT_READ, VM_PROT_READ, 0,
|
|
(caddr_t) imgp->vp, trunc_page(file_offset));
|
|
if (error)
|
|
return error;
|
|
|
|
error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
|
|
a_out->a_text + a_out->a_data);
|
|
|
|
vm_map_remove(kernel_map, buffer,
|
|
buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* remove write enable on the 'text' part
|
|
*/
|
|
error = vm_map_protect(&vmspace->vm_map,
|
|
vmaddr,
|
|
vmaddr + a_out->a_text,
|
|
VM_PROT_EXECUTE|VM_PROT_READ,
|
|
TRUE);
|
|
if (error)
|
|
return error;
|
|
}
|
|
else {
|
|
#ifdef DEBUG
|
|
printf("imgact: Page aligned binary %d\n", file_offset);
|
|
#endif
|
|
/*
|
|
* Map text+data read/execute
|
|
*/
|
|
vmaddr = virtual_offset;
|
|
error = vm_mmap(&vmspace->vm_map, &vmaddr,
|
|
a_out->a_text + a_out->a_data,
|
|
VM_PROT_READ | VM_PROT_EXECUTE,
|
|
VM_PROT_ALL,
|
|
MAP_PRIVATE | MAP_FIXED,
|
|
(caddr_t)imgp->vp, file_offset);
|
|
if (error)
|
|
return (error);
|
|
|
|
#ifdef DEBUG
|
|
printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data);
|
|
#endif
|
|
/*
|
|
* allow read/write of data
|
|
*/
|
|
error = vm_map_protect(&vmspace->vm_map,
|
|
vmaddr + a_out->a_text,
|
|
vmaddr + a_out->a_text + a_out->a_data,
|
|
VM_PROT_ALL,
|
|
FALSE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Allocate anon demand-zeroed area for uninitialized data
|
|
*/
|
|
if (bss_size != 0) {
|
|
vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
|
|
error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
|
|
bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
if (error)
|
|
return (error);
|
|
#ifdef DEBUG
|
|
printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size);
|
|
#endif
|
|
|
|
}
|
|
/* Indicate that this file should not be modified */
|
|
imgp->vp->v_flag |= VTEXT;
|
|
}
|
|
/* Fill in process VM information */
|
|
vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
|
|
vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
|
|
vmspace->vm_taddr = (caddr_t)virtual_offset;
|
|
vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
|
|
|
|
/* Fill in image_params */
|
|
imgp->interpreted = 0;
|
|
imgp->entry_addr = a_out->a_entry;
|
|
|
|
imgp->proc->p_sysent = &linux_sysvec;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Tell kern_execve.c about it, with a little help from the linker.
|
|
* Since `const' objects end up in the text segment, TEXT_SET is the
|
|
* correct directive to use.
|
|
*/
|
|
const struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
|
|
TEXT_SET(execsw_set, linux_execsw);
|
|
|