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.
196 lines
6.1 KiB
C
196 lines
6.1 KiB
C
/* $NetBSD: hpux_exec.c,v 1.38 2003/08/24 17:52:41 chs Exp $ */
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/*-
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* Copyright (c) 1996, 1997 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 Jason R. Thorpe.
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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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/*
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* Copyright (c) 1993, 1994 Christopher G. Demetriou
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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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* This product includes software developed by Christopher G. Demetriou.
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* 4. 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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/*
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* Glue for exec'ing HP-UX executables and the HP-UX execv() system call.
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* Based on sys/kern/exec_aout.c
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: hpux_exec.c,v 1.38 2003/08/24 17:52:41 chs Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/exec.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/user.h>
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#include <sys/vnode.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <machine/cpu.h>
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#include <machine/reg.h>
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#include <sys/sa.h>
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#include <sys/syscallargs.h>
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#include <compat/hpux/hpux.h>
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#include <compat/hpux/hpux_util.h>
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#include <compat/hpux/hpux_syscall.h>
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#include <compat/hpux/hpux_syscallargs.h>
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#include <machine/hpux_machdep.h>
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extern struct sysent hpux_sysent[];
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extern const char * const hpux_syscallnames[];
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extern char sigcode[], esigcode[];
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extern int native_to_hpux_errno[];
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#ifdef __HAVE_SYSCALL_INTERN
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void hpux_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_hpux_object;
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const struct emul emul_hpux = {
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"hpux",
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"/emul/hpux",
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#ifndef __HAVE_MINIMAL_EMUL
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0,
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native_to_hpux_errno,
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HPUX_SYS_syscall,
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HPUX_SYS_NSYSENT,
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#endif
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hpux_sysent,
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hpux_syscallnames,
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hpux_sendsig,
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trapsignal,
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sigcode,
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esigcode,
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&emul_hpux_object,
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hpux_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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hpux_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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/*
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* The HP-UX execv(2) system call.
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*
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* Just check the alternate emulation path, and pass it on to the NetBSD
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* execve().
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*/
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int
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hpux_sys_execv(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct hpux_sys_execv_args /* {
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syscallarg(const char *) path;
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syscallarg(char **) argv;
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} */ *uap = v;
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struct proc *p = l->l_proc;
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struct sys_execve_args ap;
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caddr_t sg;
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sg = stackgap_init(p, 0);
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CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
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SCARG(&ap, path) = SCARG(uap, path);
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SCARG(&ap, argp) = SCARG(uap, argp);
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SCARG(&ap, envp) = NULL;
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return sys_execve(l, &ap, retval);
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}
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int
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hpux_sys_execve(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct hpux_sys_execve_args /* {
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syscallarg(const char *) path;
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syscallarg(char **) argv;
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syscallarg(char **) envp;
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} */ *uap = v;
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struct proc *p = l->l_proc;
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struct sys_execve_args ap;
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caddr_t sg;
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sg = stackgap_init(p, 0);
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CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
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SCARG(&ap, path) = SCARG(uap, path);
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SCARG(&ap, argp) = SCARG(uap, argp);
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SCARG(&ap, envp) = SCARG(uap, envp);
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return sys_execve(l, &ap, retval);
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}
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