freebsd-nq/sys/i386/linux/imgact_linux.c
Mateusz Guzik b249ce48ea vfs: drop the mostly unused flags argument from VOP_UNLOCK
Filesystems which want to use it in limited capacity can employ the
VOP_UNLOCK_FLAGS macro.

Reviewed by:	kib (previous version)
Differential Revision:	https://reviews.freebsd.org/D21427
2020-01-03 22:29:58 +00:00

230 lines
6.5 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/imgact_aout.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/racct.h>
#include <sys/resourcevar.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/vm_map.h>
#include <vm/vm_extern.h>
#include <i386/linux/linux.h>
static int exec_linux_imgact(struct image_params *iparams);
static int
exec_linux_imgact(struct image_params *imgp)
{
const struct exec *a_out = (const struct exec *) imgp->image_header;
struct vmspace *vmspace;
vm_offset_t vmaddr;
unsigned long virtual_offset, file_offset;
unsigned long bss_size;
ssize_t aresid;
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: %08lx, data: %08lx, bss: %08lx\n",
(u_long)a_out->a_text, (u_long)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
*/
PROC_LOCK(imgp->proc);
if (a_out->a_text > maxtsiz ||
a_out->a_data + bss_size > lim_cur_proc(imgp->proc, RLIMIT_DATA) ||
racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) {
PROC_UNLOCK(imgp->proc);
return (ENOMEM);
}
PROC_UNLOCK(imgp->proc);
VOP_UNLOCK(imgp->vp);
/*
* Destroy old process VM and create a new one (with a new stack)
*/
error = exec_new_vmspace(imgp, &linux_sysvec);
if (error)
goto fail;
vmspace = imgp->proc->p_vmspace;
/*
* Check if file_offset page aligned,.
* Currently we cannot handle misaligned 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 %lu\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, 0, VMFS_NO_SPACE,
VM_PROT_ALL, VM_PROT_ALL, 0);
if (error)
goto fail;
error = vn_rdwr(UIO_READ, imgp->vp, (void *)vmaddr, file_offset,
a_out->a_text + a_out->a_data, UIO_USERSPACE, 0,
curthread->td_ucred, NOCRED, &aresid, curthread);
if (error != 0)
goto fail;
if (aresid != 0) {
error = ENOEXEC;
goto fail;
}
/*
* 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)
goto fail;
} else {
#ifdef DEBUG
printf("imgact: Page aligned binary %lu\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, OBJT_VNODE, imgp->vp, file_offset);
if (error)
goto fail;
#ifdef DEBUG
printf("imgact: startaddr=%08lx, length=%08lx\n",
(u_long)vmaddr,
(u_long)a_out->a_text + (u_long)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)
goto fail;
/*
* 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, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0);
if (error)
goto fail;
#ifdef DEBUG
printf("imgact: bssaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
bss_size);
#endif
}
}
/* 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)(void *)(uintptr_t)virtual_offset;
vmspace->vm_daddr =
(caddr_t)(void *)(uintptr_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;
fail:
vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
return (error);
}
/*
* Tell kern_execve.c about it, with a little help from the linker.
*/
static struct execsw linux_execsw = { exec_linux_imgact, "Linux a.out" };
EXEC_SET(linuxaout, linux_execsw);