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.
112 lines
4.2 KiB
C
112 lines
4.2 KiB
C
/* $NetBSD: irix_exec.h,v 1.20 2003/08/24 17:52:42 chs Exp $ */
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/*-
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* Copyright (c) 2001-2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Emmanuel Dreyfus.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _IRIX_EXEC_H_
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#define _IRIX_EXEC_H_
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#include <sys/types.h>
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#include <sys/exec.h>
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#include <sys/signal.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/exec_elf.h>
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#include <machine/vmparam.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_signal.h>
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/* IRIX specific per-process data, zero'ed on allocation */
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struct irix_emuldata {
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#define ied_startcopy ied_sigtramp
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void *ied_sigtramp[SVR4_NSIG]; /* Address of signal trampoline */
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#define ied_endcopy ied_termchild
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int ied_termchild; /* want SIGHUP on parent's exit */
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int ied_procblk_count; /* semaphore for blockproc */
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/* share group proc list head and lock */
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struct irix_share_group *ied_share_group;
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/* share group proc list itself */
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LIST_ENTRY(irix_emuldata) ied_sglist;
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struct proc *ied_p; /* points back to struct proc */
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int ied_shareaddr; /* share VM with the group */
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LIST_HEAD(ied_shared_regions, irix_shared_regions_rec)
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ied_shared_regions; /* list of (un)shared memory regions */
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};
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/* e_flags used by IRIX for ABI selection */
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#define IRIX_EF_IRIX_ABI64 0x00000010
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#define IRIX_EF_IRIX_ABIN32 0x00000020
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#define IRIX_EF_IRIX_ABIO32 0x00000000
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#define IRIX_EF_IRIX_ABI_MASK 0x00000030
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#define IRIX_ELF_AUX_ENTRIES 7
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#define irix_check_exec(p) ((p)->p_emul == &emul_irix)
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#ifdef EXEC_ELF32
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#define IRIX_AUX_ARGSIZ howmany(IRIX_ELF_AUX_ENTRIES * \
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sizeof(Aux32Info), sizeof (Elf32_Addr))
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int irix_elf32_copyargs __P((struct proc *, struct exec_package *,
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struct ps_strings *, char **, void *));
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int irix_elf32_probe_o32 __P((struct proc *, struct exec_package *, void *,
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char *, vaddr_t *));
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int irix_elf32_probe_n32 __P((struct proc *, struct exec_package *, void *,
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char *, vaddr_t *));
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#endif
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#ifdef EXEC_ELF64
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/* #define IRIX_AUX_ARGSIZ howmany(IRIX_ELF_AUX_ENTRIES * \
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sizeof(Aux64Info), sizeof (Elf64_Addr)) */
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int irix_elf64_copyargs __P((struct proc *, struct exec_package *,
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struct ps_strings *, char **, void *));
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int irix_elf64_probe __P((struct proc *, struct exec_package *, void *,
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char *, vaddr_t *));
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#endif
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void irix_n32_setregs __P((struct lwp *, struct exec_package *, u_long));
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extern const struct emul emul_irix;
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#endif /* !_IRIX_EXEC_H_ */
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