2b71a04b1e
constants VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, USRSTACK and PS_STRINGS. This is mainly so that they can be variable even for the native abi, based on different machine types. Get stack protections from the sysentvec too. This makes it trivial to map the stack non-executable for certain abis, on machines that support it.
244 lines
6.9 KiB
C
244 lines
6.9 KiB
C
/*-
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* Copyright (c) 1998 Mark Newton
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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 without 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/exec.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/lock.h>
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#include <sys/mman.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.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_extern.h>
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#include <compat/svr4/svr4.h>
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static int exec_svr4_imgact(struct image_params *iparams);
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static int
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exec_svr4_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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struct thread *td = curthread;
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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: %08lx, data: %08lx, bss: %08lx\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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/* For p_rlimit below. */
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mtx_assert(&Giant, MA_OWNED);
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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 ||
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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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VOP_UNLOCK(imgp->vp, 0, td);
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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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goto fail;
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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, &svr4_sysvec);
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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 %lu\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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goto fail;
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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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goto fail;
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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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goto fail;
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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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goto fail;
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}
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else {
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#ifdef DEBUG
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printf("imgact: Page aligned binary %lu\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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goto fail;
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#ifdef DEBUG
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printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
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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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goto fail;
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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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goto fail;
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#ifdef DEBUG
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printf("imgact: bssaddr=%08lx, length=%08lx\n",
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(u_long)vmaddr, bss_size);
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#endif
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}
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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 = &svr4_sysvec;
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fail:
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vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
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return (error);
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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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*/
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struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
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EXEC_SET(execsw_set, svr4_execsw);
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