f489acaf0f
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
314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
/*-
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* Copyright (c) 2002 Doug Rabson
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* Copyright (c) 2003 Peter Wemm
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#define __ELF_WORD_SIZE 32
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/fcntl.h>
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#include <sys/imgact.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/mman.h>
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#include <sys/namei.h>
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#include <sys/pioctl.h>
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#include <sys/proc.h>
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#include <sys/procfs.h>
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#include <sys/resourcevar.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/syscall.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <sys/imgact_elf.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <compat/freebsd32/freebsd32_util.h>
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <compat/freebsd32/freebsd32_syscall.h>
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#include <compat/ia32/ia32_signal.h>
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#ifdef __amd64__
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#include <machine/psl.h>
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#include <machine/segments.h>
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#include <machine/specialreg.h>
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#else
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#include <i386/include/psl.h>
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#include <i386/include/segments.h>
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#include <i386/include/specialreg.h>
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#endif
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#include <machine/frame.h>
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#include <machine/md_var.h>
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#include <machine/pcb.h>
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#include <machine/cpufunc.h>
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CTASSERT(sizeof(struct ia32_mcontext) == 640);
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CTASSERT(sizeof(struct ia32_ucontext) == 704);
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CTASSERT(sizeof(struct ia32_sigframe) == 800);
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CTASSERT(sizeof(struct ia32_siginfo) == 64);
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#ifdef COMPAT_FREEBSD4
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CTASSERT(sizeof(struct ia32_mcontext4) == 260);
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CTASSERT(sizeof(struct ia32_ucontext4) == 324);
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CTASSERT(sizeof(struct ia32_sigframe4) == 408);
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#endif
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static register_t *ia32_copyout_strings(struct image_params *imgp);
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static void ia32_fixlimits(struct image_params *imgp);
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extern struct sysent freebsd32_sysent[];
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SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
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struct sysentvec ia32_freebsd_sysvec = {
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FREEBSD32_SYS_MAXSYSCALL,
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freebsd32_sysent,
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0,
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0,
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NULL,
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0,
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NULL,
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NULL,
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elf32_freebsd_fixup,
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ia32_sendsig,
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ia32_sigcode,
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&sz_ia32_sigcode,
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NULL,
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"FreeBSD ELF32",
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elf32_coredump,
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NULL,
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MINSIGSTKSZ,
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IA32_PAGE_SIZE,
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0,
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FREEBSD32_USRSTACK,
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FREEBSD32_USRSTACK,
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FREEBSD32_PS_STRINGS,
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VM_PROT_ALL,
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ia32_copyout_strings,
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ia32_setregs,
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ia32_fixlimits
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};
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static Elf32_Brandinfo ia32_brand_info = {
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ELFOSABI_FREEBSD,
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EM_386,
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"FreeBSD",
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NULL,
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"/libexec/ld-elf.so.1",
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&ia32_freebsd_sysvec,
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"/libexec/ld-elf32.so.1",
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};
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SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
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(sysinit_cfunc_t) elf32_insert_brand_entry,
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&ia32_brand_info);
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static Elf32_Brandinfo ia32_brand_oinfo = {
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ELFOSABI_FREEBSD,
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EM_386,
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"FreeBSD",
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NULL,
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"/usr/libexec/ld-elf.so.1",
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&ia32_freebsd_sysvec,
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"/libexec/ld-elf32.so.1",
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};
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SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
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(sysinit_cfunc_t) elf32_insert_brand_entry,
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&ia32_brand_oinfo);
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void
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elf32_dump_thread(struct thread *td __unused, void *dst __unused,
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size_t *off __unused)
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{
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}
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/* XXX may be freebsd32 MI */
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static register_t *
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ia32_copyout_strings(struct image_params *imgp)
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{
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int argc, envc;
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u_int32_t *vectp;
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char *stringp, *destp;
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u_int32_t *stack_base;
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struct freebsd32_ps_strings *arginfo;
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int szsigcode;
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/*
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* Calculate string base and vector table pointers.
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* Also deal with signal trampoline code for this exec type.
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*/
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arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
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szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
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destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
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roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
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/*
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* install sigcode
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*/
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if (szsigcode)
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copyout(imgp->proc->p_sysent->sv_sigcode,
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((caddr_t)arginfo - szsigcode), szsigcode);
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/*
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* If we have a valid auxargs ptr, prepare some room
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* on the stack.
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*/
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if (imgp->auxargs) {
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/*
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* 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
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* lower compatibility.
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*/
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imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
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: (AT_COUNT * 2);
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/*
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* The '+ 2' is for the null pointers at the end of each of
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* the arg and env vector sets,and imgp->auxarg_size is room
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* for argument of Runtime loader.
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*/
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vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 +
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imgp->auxarg_size) * sizeof(u_int32_t));
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} else
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/*
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* The '+ 2' is for the null pointers at the end of each of
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* the arg and env vector sets
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*/
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vectp = (u_int32_t *)
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(destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t));
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/*
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* vectp also becomes our initial stack base
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*/
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stack_base = vectp;
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stringp = imgp->args->begin_argv;
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argc = imgp->args->argc;
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envc = imgp->args->envc;
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/*
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* Copy out strings - arguments and environment.
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*/
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copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
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/*
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* Fill in "ps_strings" struct for ps, w, etc.
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*/
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suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
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suword32(&arginfo->ps_nargvstr, argc);
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/*
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* Fill in argument portion of vector table.
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*/
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for (; argc > 0; --argc) {
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suword32(vectp++, (u_int32_t)(intptr_t)destp);
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while (*stringp++ != 0)
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destp++;
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destp++;
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}
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/* a null vector table pointer separates the argp's from the envp's */
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suword32(vectp++, 0);
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suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
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suword32(&arginfo->ps_nenvstr, envc);
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/*
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* Fill in environment portion of vector table.
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*/
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for (; envc > 0; --envc) {
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suword32(vectp++, (u_int32_t)(intptr_t)destp);
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while (*stringp++ != 0)
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destp++;
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destp++;
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}
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/* end of vector table is a null pointer */
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suword32(vectp, 0);
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return ((register_t *)stack_base);
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}
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static u_long ia32_maxdsiz = IA32_MAXDSIZ;
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SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
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static u_long ia32_maxssiz = IA32_MAXSSIZ;
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SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
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static u_long ia32_maxvmem = IA32_MAXVMEM;
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SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
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static void
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ia32_fixlimits(struct image_params *imgp)
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{
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struct proc *p = imgp->proc;
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struct plimit *oldlim, *newlim;
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if (ia32_maxdsiz == 0 && ia32_maxssiz == 0 && ia32_maxvmem == 0)
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return;
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newlim = lim_alloc();
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PROC_LOCK(p);
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oldlim = p->p_limit;
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lim_copy(newlim, oldlim);
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if (ia32_maxdsiz != 0) {
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if (newlim->pl_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz)
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newlim->pl_rlimit[RLIMIT_DATA].rlim_cur = ia32_maxdsiz;
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if (newlim->pl_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz)
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newlim->pl_rlimit[RLIMIT_DATA].rlim_max = ia32_maxdsiz;
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}
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if (ia32_maxssiz != 0) {
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if (newlim->pl_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz)
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newlim->pl_rlimit[RLIMIT_STACK].rlim_cur = ia32_maxssiz;
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if (newlim->pl_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz)
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newlim->pl_rlimit[RLIMIT_STACK].rlim_max = ia32_maxssiz;
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}
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if (ia32_maxvmem != 0) {
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if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem)
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newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur = ia32_maxvmem;
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if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem)
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newlim->pl_rlimit[RLIMIT_VMEM].rlim_max = ia32_maxvmem;
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}
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p->p_limit = newlim;
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PROC_UNLOCK(p);
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lim_free(oldlim);
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}
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