b3e7e1b010
code and not trying to use temporary solutions. Lots of comments and help from YAMAMOTO Takashi, also thanks to the PaX author for being quick to recognize that something fishy's going on. :) Hook up in mmap/vmcmd rather than (ugh!) uvm_map_protect(). Next time I suggest to commit a temporary solution just revoke my commit bit.
177 lines
4.8 KiB
C
177 lines
4.8 KiB
C
/* $NetBSD: uvm_unix.c,v 1.33 2006/05/20 15:45:38 elad Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1991, 1993 The Regents of the University of California.
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* Copyright (c) 1988 University of Utah.
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*
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor,
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* Washington University, the University of California, Berkeley and
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* its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
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* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
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* from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp
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*/
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/*
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* uvm_unix.c: traditional sbrk/grow interface to vm.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.33 2006/05/20 15:45:38 elad Exp $");
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#include "opt_pax.h"
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#include <sys/param.h>
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#include <sys/systm.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 <sys/mount.h>
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#include <sys/sa.h>
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#include <sys/syscallargs.h>
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#ifdef PAX_MPROTECT
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#include <sys/pax.h>
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#endif /* PAX_MPROTECT */
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#include <uvm/uvm.h>
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/*
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* sys_obreak: set break
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*/
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int
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sys_obreak(struct lwp *l, void *v, register_t *retval)
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{
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struct sys_obreak_args /* {
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syscallarg(char *) nsize;
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} */ *uap = v;
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struct proc *p = l->l_proc;
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struct vmspace *vm = p->p_vmspace;
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vaddr_t new, old;
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int error;
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old = (vaddr_t)vm->vm_daddr;
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new = round_page((vaddr_t)SCARG(uap, nsize));
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if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old)
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return (ENOMEM);
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old = round_page(old + ptoa(vm->vm_dsize));
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if (new == old)
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return (0);
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/*
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* grow or shrink?
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*/
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if (new > old) {
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vm_prot_t prot = UVM_PROT_READ | UVM_PROT_WRITE;
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vm_prot_t maxprot = UVM_PROT_ALL;
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#ifdef PAX_MPROTECT
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pax_mprotect(l, &prot, &maxprot);
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#endif /* PAX_MPROTECT */
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error = uvm_map(&vm->vm_map, &old, new - old, NULL,
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UVM_UNKNOWN_OFFSET, 0,
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UVM_MAPFLAG(prot, maxprot,
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UVM_INH_COPY,
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UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED|
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UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW));
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if (error) {
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uprintf("sbrk: grow %ld failed, error = %d\n",
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new - old, error);
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return (error);
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}
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vm->vm_dsize += atop(new - old);
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} else {
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uvm_deallocate(&vm->vm_map, new, old - new);
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vm->vm_dsize -= atop(old - new);
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}
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return (0);
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}
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/*
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* uvm_grow: enlarge the "stack segment" to include sp.
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*/
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int
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uvm_grow(struct proc *p, vaddr_t sp)
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{
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struct vmspace *vm = p->p_vmspace;
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vsize_t nss;
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/*
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* For user defined stacks (from sendsig).
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*/
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if (sp < (vaddr_t)vm->vm_maxsaddr)
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return (0);
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/*
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* For common case of already allocated (from trap).
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*/
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if (sp >= USRSTACK - ctob(vm->vm_ssize))
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return (1);
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/*
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* Really need to check vs limit and increment stack size if ok.
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*/
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nss = btoc(USRSTACK - sp);
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if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
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return (0);
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vm->vm_ssize = nss;
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return (1);
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}
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/*
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* sys_oadvise: old advice system call
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*/
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/* ARGSUSED */
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int
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sys_ovadvise(struct lwp *l, void *v, register_t *retval)
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{
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#if 0
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struct sys_ovadvise_args /* {
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syscallarg(int) anom;
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} */ *uap = v;
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#endif
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return (EINVAL);
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}
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