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.
252 lines
7.1 KiB
C
252 lines
7.1 KiB
C
/*
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* Copyright (c) 1998-1999 Andrew Gallatin
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* All rights reserved.
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*
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* Based heavily on imgact_linux.c which is
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* Copyright (c) 1994-1996 Søren Schmidt.
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* Which in turn is 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/types.h>
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#include <sys/malloc.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/filedesc.h>
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#include <sys/fcntl.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/module.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/pioctl.h>
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#include <sys/namei.h>
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#include <sys/sysent.h>
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#include <sys/shm.h>
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#include <sys/sysctl.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 <alpha/osf1/exec_ecoff.h>
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extern struct sysentvec osf1_sysvec;
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#ifdef DEBUG
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#define DPRINTF(a) printf a;
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#else
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#define DPRINTF(a)
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#endif
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static int
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exec_osf1_imgact(struct image_params *imgp)
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{
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int error;
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int path_not_saved;
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size_t bytes;
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const struct ecoff_exechdr *execp;
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const struct ecoff_aouthdr *eap;
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struct vmspace *vmspace;
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vm_offset_t baddr;
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vm_offset_t bsize;
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vm_offset_t bss_start;
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vm_offset_t daddr;
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vm_offset_t dend;
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vm_offset_t dsize;
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vm_offset_t raw_dend;
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vm_offset_t taddr;
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vm_offset_t tend;
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vm_offset_t tsize;
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struct nameidata *ndp;
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Osf_Auxargs *osf_auxargs;
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GIANT_REQUIRED;
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execp = (const struct ecoff_exechdr*)imgp->image_header;
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eap = &execp->a;
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ndp = NULL;
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/* check to make sure we have an alpha ecoff executable */
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if (ECOFF_BADMAG(execp))
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return -1;
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/* verfify it an OSF/1 exectutable */
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if (eap->magic != ECOFF_ZMAGIC) {
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printf("unknown ecoff magic %x\n", eap->magic);
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return ENOEXEC;
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}
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osf_auxargs = malloc(sizeof(Osf_Auxargs), M_TEMP, M_WAITOK | M_ZERO);
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imgp->auxargs = osf_auxargs;
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osf_auxargs->executable = osf_auxargs->exec_path;
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path_not_saved = copyinstr(imgp->fname, osf_auxargs->executable,
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PATH_MAX, &bytes);
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if (execp->f.f_flags & DYNAMIC_FLAG) {
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if (path_not_saved) {
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uprintf("path to dynamic exectutable not found\n");
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free(imgp->auxargs, M_TEMP);
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return(path_not_saved);
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}
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/*
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* Unmap the executable & attempt to slide in
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* /sbin/loader in its place.
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*/
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if (imgp->firstpage)
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exec_unmap_first_page(imgp);
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/*
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* Replicate what execve does, and map the first
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* page of the loader.
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*/
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ndp = (struct nameidata *)malloc(sizeof(struct nameidata),
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M_TEMP, M_WAITOK);
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NDINIT(ndp, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE,
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"/compat/osf1/sbin/loader",
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FIRST_THREAD_IN_PROC(imgp->proc));
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error = namei(ndp);
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if (error) {
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uprintf("imgact_osf1: can't read /compat/osf1/sbin/loader\n");
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free(imgp->auxargs, M_TEMP);
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return(error);
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}
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if (imgp->vp) {
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vput(imgp->vp);
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/* leaking in the nameizone ??? XXX */
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}
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imgp->vp = ndp->ni_vp;
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error = exec_map_first_page(imgp);
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osf_auxargs->loader = "/compat/osf1/sbin/loader";
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}
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execp = (const struct ecoff_exechdr*)imgp->image_header;
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eap = &execp->a;
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taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
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tend = round_page(eap->text_start + eap->tsize);
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tsize = tend - taddr;
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daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
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dend = round_page(eap->data_start + eap->dsize);
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dsize = dend - daddr;
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bss_start = ECOFF_SEGMENT_ALIGN(execp, eap->bss_start);
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bsize = eap->bsize;
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imgp->entry_addr = eap->entry;
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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 bail;
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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, &osf1_sysvec);
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/*
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* The vm space can now be changed.
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*/
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vmspace = imgp->proc->p_vmspace;
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imgp->interpreted = 0;
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imgp->proc->p_sysent = &osf1_sysvec;
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/* set up text segment */
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if ((error = vm_mmap(&vmspace->vm_map, &taddr, tsize,
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VM_PROT_READ|VM_PROT_EXECUTE, VM_PROT_ALL, MAP_FIXED|MAP_COPY,
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(caddr_t)imgp->vp, ECOFF_TXTOFF(execp)))) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
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return error;
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}
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/* .. data .. */
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if ((error = vm_mmap(&vmspace->vm_map, &daddr, dsize,
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VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE, VM_PROT_ALL,
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MAP_FIXED|MAP_COPY, (caddr_t)imgp->vp, ECOFF_DATOFF(execp)))) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
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goto bail;
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}
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/* .. bss .. */
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if (round_page(bsize)) {
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baddr = bss_start;
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if ((error = vm_map_find(&vmspace->vm_map, NULL,
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(vm_offset_t) 0, &baddr, round_page(bsize), FALSE,
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VM_PROT_ALL, VM_PROT_ALL, FALSE))) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__,
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error));
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goto bail;
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}
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}
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raw_dend = (eap->data_start + eap->dsize);
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if (dend > raw_dend) {
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caddr_t zeros;
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zeros = malloc(dend-raw_dend,M_TEMP,M_WAITOK|M_ZERO);
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if ((error = copyout(zeros, (caddr_t)raw_dend,
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dend-raw_dend))) {
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uprintf("Can't zero start of bss, error %d\n",error);
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free(zeros,M_TEMP);
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goto bail;
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}
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free(zeros,M_TEMP);
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}
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vmspace->vm_tsize = btoc(round_page(tsize));
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vmspace->vm_dsize = btoc((round_page(dsize) + round_page(bsize)));
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vmspace->vm_taddr = (caddr_t)taddr;
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vmspace->vm_daddr = (caddr_t)daddr;
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return(0);
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bail:
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free(imgp->auxargs, M_TEMP);
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if (ndp) {
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VOP_CLOSE(ndp->ni_vp, FREAD, imgp->proc->p_ucred,
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FIRST_THREAD_IN_PROC(imgp->proc));
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vrele(ndp->ni_vp);
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}
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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 osf1_execsw = { exec_osf1_imgact, "OSF/1 ECOFF" };
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EXEC_SET(osf1_ecoff, osf1_execsw);
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