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5856e12e69
fork. (On my machine, fork is about 240usecs, vfork is 78usecs.) Implement rfork(!RFPROC !RFMEM), which allows a thread to divorce its memory from the other threads of a group. Implement rfork(!RFPROC RFCFDG), which closes all file descriptors, eliminating possible existing shares with other threads/processes. Implement rfork(!RFPROC RFFDG), which divorces the file descriptors for a thread from the rest of the group. Fix the case where a thread does an exec. It is almost nonsense for a thread to modify the other threads address space by an exec, so we now automatically divorce the address space before modifying it.
243 lines
7.0 KiB
C
243 lines
7.0 KiB
C
/*-
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* Copyright (c) 1994-1996 Søren Schmidt
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* All rights reserved.
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*
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* Based heavily on /sys/kern/imgact_aout.c which is:
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* Copyright (c) 1993, David Greenman
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: imgact_linux.c,v 1.21 1997/04/01 08:39:05 bde Exp $
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*/
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#ifndef LKM
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#include "opt_rlimit.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h>
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#include <sys/exec.h>
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#include <sys/mman.h>
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#include <sys/imgact.h>
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#include <sys/imgact_aout.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_extern.h>
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#include <i386/linux/linux.h>
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#include <i386/linux/linux_proto.h>
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extern int exec_linux_imgact __P((struct image_params *iparams));
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int
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exec_linux_imgact(imgp)
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struct image_params *imgp;
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{
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const struct exec *a_out = (const struct exec *) imgp->image_header;
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struct vmspace *vmspace;
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vm_offset_t vmaddr;
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unsigned long virtual_offset, file_offset;
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vm_offset_t buffer;
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unsigned long bss_size;
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int error;
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if (((a_out->a_magic >> 16) & 0xff) != 0x64)
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return -1;
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/*
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* Set file/virtual offset based on a.out variant.
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*/
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switch ((int)(a_out->a_magic & 0xffff)) {
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case 0413:
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virtual_offset = 0;
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file_offset = 1024;
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break;
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case 0314:
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virtual_offset = 4096;
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file_offset = 0;
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break;
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default:
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return (-1);
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}
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bss_size = round_page(a_out->a_bss);
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#ifdef DEBUG
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printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, a_out->a_data, bss_size);
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#endif
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/*
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* Check various fields in header for validity/bounds.
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*/
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if (a_out->a_entry < virtual_offset ||
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a_out->a_entry >= virtual_offset + a_out->a_text ||
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a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
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return (-1);
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/* text + data can't exceed file size */
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if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
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return (EFAULT);
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/*
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* text/data/bss must not exceed limits
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*/
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if (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ ||
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a_out->a_data+bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
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return (ENOMEM);
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/* copy in arguments and/or environment from old process */
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error = exec_extract_strings(imgp);
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if (error)
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return (error);
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/*
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* Destroy old process VM and create a new one (with a new stack)
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*/
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exec_new_vmspace(imgp);
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vmspace = imgp->proc->p_vmspace;
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/*
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* Check if file_offset page aligned,.
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* Currently we cannot handle misalinged file offsets,
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* and so we read in the entire image (what a waste).
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*/
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if (file_offset & PAGE_MASK) {
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#ifdef DEBUG
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printf("imgact: Non page aligned binary %d\n", file_offset);
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#endif
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/*
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* Map text+data+bss read/write/execute
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*/
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vmaddr = virtual_offset;
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error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
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a_out->a_text + a_out->a_data + bss_size, FALSE,
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VM_PROT_ALL, VM_PROT_ALL, 0);
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if (error)
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return error;
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error = vm_mmap(kernel_map, &buffer,
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round_page(a_out->a_text + a_out->a_data + file_offset),
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VM_PROT_READ, VM_PROT_READ, 0,
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(caddr_t) imgp->vp, trunc_page(file_offset));
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if (error)
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return error;
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error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
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a_out->a_text + a_out->a_data);
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vm_map_remove(kernel_map, buffer,
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buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
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if (error)
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return error;
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/*
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* remove write enable on the 'text' part
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*/
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error = vm_map_protect(&vmspace->vm_map,
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vmaddr,
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vmaddr + a_out->a_text,
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VM_PROT_EXECUTE|VM_PROT_READ,
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TRUE);
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if (error)
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return error;
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}
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else {
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#ifdef DEBUG
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printf("imgact: Page aligned binary %d\n", file_offset);
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#endif
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/*
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* Map text+data read/execute
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*/
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vmaddr = virtual_offset;
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error = vm_mmap(&vmspace->vm_map, &vmaddr,
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a_out->a_text + a_out->a_data,
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VM_PROT_READ | VM_PROT_EXECUTE,
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VM_PROT_ALL,
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MAP_PRIVATE | MAP_FIXED,
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(caddr_t)imgp->vp, file_offset);
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if (error)
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return (error);
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#ifdef DEBUG
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printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data);
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#endif
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/*
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* allow read/write of data
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*/
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error = vm_map_protect(&vmspace->vm_map,
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vmaddr + a_out->a_text,
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vmaddr + a_out->a_text + a_out->a_data,
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VM_PROT_ALL,
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FALSE);
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if (error)
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return (error);
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/*
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* Allocate anon demand-zeroed area for uninitialized data
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*/
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if (bss_size != 0) {
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vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
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error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
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bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
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if (error)
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return (error);
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#ifdef DEBUG
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printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size);
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#endif
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}
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/* Indicate that this file should not be modified */
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imgp->vp->v_flag |= VTEXT;
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}
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/* Fill in process VM information */
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vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
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vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
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vmspace->vm_taddr = (caddr_t)virtual_offset;
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vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
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/* Fill in image_params */
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imgp->interpreted = 0;
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imgp->entry_addr = a_out->a_entry;
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imgp->proc->p_sysent = &linux_sysvec;
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return (0);
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}
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/*
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* Tell kern_execve.c about it, with a little help from the linker.
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* Since `const' objects end up in the text segment, TEXT_SET is the
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* correct directive to use.
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*/
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const struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
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TEXT_SET(execsw_set, linux_execsw);
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