610ecfe035
copies arguments into the kernel space and one that operates completely in the kernel space; o use kernel-only version of execve(2) to kill another stackgap in linuxlator/i386. Obtained from: DragonFlyBSD (partially) MFC after: 2 weeks
130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/*-
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* Copyright (c) 1995 Steven Wallace
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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. 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 Steven Wallace.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/sysent.h>
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#include <sys/signalvar.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <i386/ibcs2/ibcs2_syscall.h>
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#include <i386/ibcs2/ibcs2_signal.h>
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MODULE_VERSION(ibcs2, 1);
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extern int bsd_to_ibcs2_errno[];
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extern struct sysent ibcs2_sysent[IBCS2_SYS_MAXSYSCALL];
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extern int szsigcode;
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extern char sigcode[];
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static int ibcs2_fixup(register_t **, struct image_params *);
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struct sysentvec ibcs2_svr3_sysvec = {
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sizeof (ibcs2_sysent) / sizeof (ibcs2_sysent[0]),
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ibcs2_sysent,
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0xFF,
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IBCS2_SIGTBLSZ,
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bsd_to_ibcs2_sig,
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ELAST + 1,
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bsd_to_ibcs2_errno,
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NULL, /* trap-to-signal translation function */
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ibcs2_fixup, /* fixup */
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sendsig,
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sigcode, /* use generic trampoline */
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&szsigcode, /* use generic trampoline size */
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NULL, /* prepsyscall */
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"IBCS2 COFF",
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NULL, /* we don't have a COFF coredump function */
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NULL,
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IBCS2_MINSIGSTKSZ,
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PAGE_SIZE,
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VM_MIN_ADDRESS,
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VM_MAXUSER_ADDRESS,
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USRSTACK,
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PS_STRINGS,
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VM_PROT_ALL,
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exec_copyout_strings,
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exec_setregs,
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NULL
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};
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static int
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ibcs2_fixup(register_t **stack_base, struct image_params *imgp)
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{
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return (suword(--(*stack_base), imgp->args->argc));
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}
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/*
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* Create an "ibcs2" module that does nothing but allow checking for
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* the presence of the subsystem.
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*/
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static int
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ibcs2_modevent(module_t mod, int type, void *unused)
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{
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struct proc *p = NULL;
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int rval = 0;
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switch(type) {
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case MOD_UNLOAD:
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/* if this was an ELF module we'd use elf_brand_inuse()... */
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sx_slock(&allproc_lock);
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LIST_FOREACH(p, &allproc, p_list) {
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if (p->p_sysent == &ibcs2_svr3_sysvec) {
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rval = EBUSY;
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break;
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}
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}
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sx_sunlock(&allproc_lock);
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default:
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return (EOPNOTSUPP);
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break;
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}
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return (rval);
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}
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static moduledata_t ibcs2_mod = {
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"ibcs2",
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ibcs2_modevent,
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0
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};
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DECLARE_MODULE(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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