939df36e55
and make the stack and heap non-executable by default. the changes fall into two basic catagories: - pmap and trap-handler changes. these are all MD: = alpha: we already track per-page execute permission with the (software) PG_EXEC bit, so just have the trap handler pay attention to it. = i386: use a new GDT segment for %cs for processes that have no executable mappings above a certain threshold (currently the bottom of the stack). track per-page execute permission with the last unused PTE bit. = powerpc/ibm4xx: just use the hardware exec bit. = powerpc/oea: we already track per-page exec bits, but the hardware only implements non-exec mappings at the segment level. so track the number of executable mappings in each segment and turn on the no-exec segment bit iff the count is 0. adjust the trap handler to deal. = sparc (sun4m): fix our use of the hardware protection bits. fix the trap handler to recognize text faults. = sparc64: split the existing unified TSB into data and instruction TSBs, and only load TTEs into the appropriate TSB(s) for the permissions. fix the trap handler to check for execute permission. = not yet implemented: amd64, hppa, sh5 - changes in all the emulations that put a signal trampoline on the stack. instead, we now put the trampoline into a uvm_aobj and map that into the process separately. originally from openbsd, adapted for netbsd by me.
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* $NetBSD: sunos_exec.c,v 1.41 2003/08/24 17:52:45 chs Exp $ */
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/*
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* Copyright (c) 1993 Theo de Raadt
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* All rights reserved.
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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. 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: sunos_exec.c,v 1.41 2003/08/24 17:52:45 chs Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_syscall_debug.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/proc.h>
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#include <sys/mount.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <sys/exec.h>
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#include <compat/sunos/sunos.h>
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#include <compat/sunos/sunos_syscall.h>
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extern int nsunos_sysent;
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extern struct sysent sunos_sysent[];
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#ifdef SYSCALL_DEBUG
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extern const char * const sunos_syscallnames[];
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#endif
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extern char sunos_sigcode[], sunos_esigcode[];
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#ifdef __HAVE_SYSCALL_INTERN
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void sunos_syscall_intern __P((struct proc *));
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#else
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void syscall __P((void));
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#endif
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struct uvm_object *emul_sunos_object;
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const struct emul emul_sunos = {
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"sunos",
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"/emul/sunos",
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#ifndef __HAVE_MINIMAL_EMUL
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0,
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NULL,
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SUNOS_SYS_syscall,
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SUNOS_SYS_NSYSENT,
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#endif
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sunos_sysent,
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#ifdef SYSCALL_DEBUG
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sunos_syscallnames,
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#else
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NULL,
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#endif
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sunos_sendsig,
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trapsignal,
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sunos_sigcode,
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sunos_esigcode,
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&emul_sunos_object,
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setregs,
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NULL,
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NULL,
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NULL,
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#ifdef __HAVE_SYSCALL_INTERN
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sunos_syscall_intern,
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#else
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syscall,
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#endif
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NULL,
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NULL,
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};
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