c460ac3a00
systems where the data/stack/etc limits are too big for a 32 bit process. Move the 5 or so identical instances of ELF_RTLD_ADDR() into imgact_elf.c. Supply an ia32_fixlimits function. Export the clip/default values to sysctl under the compat.ia32 heirarchy. Have mmap(0, ...) respect the current p->p_limits[RLIMIT_DATA].rlim_max value rather than the sysctl tweakable variable. This allows mmap to place mappings at sensible locations when limits have been reduced. Have the imgact_elf.c ld-elf.so.1 placement algorithm use the same method as mmap(0, ...) now does. Note that we cannot remove all references to the sysctl tweakable maxdsiz etc variables because /etc/login.conf specifies a datasize of 'unlimited'. And that causes exec etc to fail since it can no longer find space to mmap things.
386 lines
10 KiB
C
386 lines
10 KiB
C
/*-
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* Copyright (c) 2002 Doug Rabson
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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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* $FreeBSD$
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*/
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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 <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 <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 <ia64/ia32/ia32_util.h>
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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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static register_t *ia32_copyout_strings(struct image_params *imgp);
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static void ia32_setregs(struct thread *td, u_long entry, u_long stack,
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u_long ps_strings);
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extern struct sysent ia32_sysent[];
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static char ia32_sigcode[] = {
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0xff, 0x54, 0x24, 0x10, /* call *SIGF_HANDLER(%esp) */
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0x8d, 0x44, 0x24, 0x14, /* lea SIGF_UC(%esp),%eax */
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0x50, /* pushl %eax */
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0xf7, 0x40, 0x54, 0x00, 0x00, 0x02, 0x02, /* testl $PSL_VM,UC_EFLAGS(%eax) */
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0x75, 0x03, /* jne 9f */
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0x8e, 0x68, 0x14, /* movl UC_GS(%eax),%gs */
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0xb8, 0x57, 0x01, 0x00, 0x00, /* 9: movl $SYS_sigreturn,%eax */
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0x50, /* pushl %eax */
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0xcd, 0x80, /* int $0x80 */
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0xeb, 0xfe, /* 0: jmp 0b */
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0
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};
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static int ia32_szsigcode = sizeof(ia32_sigcode);
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struct sysentvec ia32_freebsd_sysvec = {
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SYS_MAXSYSCALL,
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ia32_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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sendsig,
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ia32_sigcode,
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&ia32_szsigcode,
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NULL,
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"FreeBSD ELF",
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elf32_coredump,
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NULL,
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IA32_MINSIGSTKSZ,
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IA32_PAGE_SIZE,
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0,
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IA32_USRSTACK,
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IA32_USRSTACK,
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IA32_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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NULL
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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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"/compat/ia32",
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"/lib/ld-elf.so.1",
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&ia32_freebsd_sysvec
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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 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 ia32_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 ia32_ps_strings *)IA32_PS_STRINGS;
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szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
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destp = (caddr_t)arginfo - szsigcode - IA32_USRSPACE -
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roundup((ARG_MAX - imgp->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->argc + imgp->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->argc + imgp->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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vectp = (void*)((uintptr_t)vectp & ~15);
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stack_base = vectp;
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stringp = imgp->stringbase;
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argc = imgp->argc;
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envc = imgp->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->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 void
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ia32_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
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{
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struct trapframe *tf = td->td_frame;
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vm_offset_t gdt, ldt;
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u_int64_t codesel, datasel, ldtsel;
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u_int64_t codeseg, dataseg, gdtseg, ldtseg;
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struct segment_descriptor desc;
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struct vmspace *vmspace = td->td_proc->p_vmspace;
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exec_setregs(td, entry, stack, ps_strings);
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/* Non-syscall frames are cleared by exec_setregs() */
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if (tf->tf_flags & FRAME_SYSCALL) {
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bzero(&tf->tf_scratch, sizeof(tf->tf_scratch));
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bzero(&tf->tf_scratch_fp, sizeof(tf->tf_scratch_fp));
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} else
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tf->tf_special.ndirty = 0;
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tf->tf_special.psr |= IA64_PSR_IS;
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tf->tf_special.sp = stack;
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/* Point the RSE backstore to something harmless. */
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tf->tf_special.bspstore = (IA32_PS_STRINGS - ia32_szsigcode -
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IA32_USRSPACE + 15) & ~15;
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codesel = LSEL(LUCODE_SEL, SEL_UPL);
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datasel = LSEL(LUDATA_SEL, SEL_UPL);
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ldtsel = GSEL(GLDT_SEL, SEL_UPL);
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/* Setup ia32 segment registers. */
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tf->tf_scratch.gr16 = (datasel << 48) | (datasel << 32) |
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(datasel << 16) | datasel;
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tf->tf_scratch.gr17 = (ldtsel << 32) | (datasel << 16) | codesel;
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/*
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* Build the GDT and LDT.
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*/
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gdt = IA32_USRSTACK;
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vm_map_find(&vmspace->vm_map, 0, 0, &gdt, IA32_PAGE_SIZE << 1, 0,
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VM_PROT_ALL, VM_PROT_ALL, 0);
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ldt = gdt + IA32_PAGE_SIZE;
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desc.sd_lolimit = 8*NLDT-1;
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desc.sd_lobase = ldt & 0xffffff;
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desc.sd_type = SDT_SYSLDT;
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desc.sd_dpl = SEL_UPL;
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desc.sd_p = 1;
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desc.sd_hilimit = 0;
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desc.sd_def32 = 0;
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desc.sd_gran = 0;
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desc.sd_hibase = ldt >> 24;
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copyout(&desc, (caddr_t) gdt + 8*GLDT_SEL, sizeof(desc));
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desc.sd_lolimit = ((IA32_USRSTACK >> 12) - 1) & 0xffff;
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desc.sd_lobase = 0;
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desc.sd_type = SDT_MEMERA;
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desc.sd_dpl = SEL_UPL;
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desc.sd_p = 1;
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desc.sd_hilimit = ((IA32_USRSTACK >> 12) - 1) >> 16;
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desc.sd_def32 = 1;
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desc.sd_gran = 1;
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desc.sd_hibase = 0;
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copyout(&desc, (caddr_t) ldt + 8*LUCODE_SEL, sizeof(desc));
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desc.sd_type = SDT_MEMRWA;
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copyout(&desc, (caddr_t) ldt + 8*LUDATA_SEL, sizeof(desc));
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codeseg = 0 /* base */
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+ (((IA32_USRSTACK >> 12) - 1) << 32) /* limit */
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+ ((long)SDT_MEMERA << 52)
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+ ((long)SEL_UPL << 57)
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+ (1L << 59) /* present */
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+ (1L << 62) /* 32 bits */
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+ (1L << 63); /* page granularity */
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dataseg = 0 /* base */
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+ (((IA32_USRSTACK >> 12) - 1) << 32) /* limit */
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+ ((long)SDT_MEMRWA << 52)
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+ ((long)SEL_UPL << 57)
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+ (1L << 59) /* present */
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+ (1L << 62) /* 32 bits */
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+ (1L << 63); /* page granularity */
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tf->tf_scratch.csd = codeseg;
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tf->tf_scratch.ssd = dataseg;
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tf->tf_scratch.gr24 = dataseg; /* ESD */
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tf->tf_scratch.gr27 = dataseg; /* DSD */
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tf->tf_scratch.gr28 = dataseg; /* FSD */
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tf->tf_scratch.gr29 = dataseg; /* GSD */
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gdtseg = gdt /* base */
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+ ((8L*NGDT - 1) << 32) /* limit */
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+ ((long)SDT_SYSNULL << 52)
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+ ((long)SEL_UPL << 57)
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+ (1L << 59) /* present */
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+ (0L << 62) /* 16 bits */
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+ (0L << 63); /* byte granularity */
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ldtseg = ldt /* base */
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+ ((8L*NLDT - 1) << 32) /* limit */
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+ ((long)SDT_SYSLDT << 52)
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+ ((long)SEL_UPL << 57)
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+ (1L << 59) /* present */
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+ (0L << 62) /* 16 bits */
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+ (0L << 63); /* byte granularity */
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tf->tf_scratch.gr30 = ldtseg; /* LDTD */
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tf->tf_scratch.gr31 = gdtseg; /* GDTD */
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/* Set ia32 control registers on this processor. */
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ia64_set_cflg(CR0_PE | CR0_PG | ((long)(CR4_XMM | CR4_FXSR) << 32));
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ia64_set_eflag(PSL_USER);
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/* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
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tf->tf_scratch.gr11 = IA32_PS_STRINGS;
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/*
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* XXX - Linux emulator
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* Make sure sure edx is 0x0 on entry. Linux binaries depend
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* on it.
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*/
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td->td_retval[1] = 0;
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}
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void
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ia32_restorectx(struct pcb *pcb)
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{
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ia64_set_cflg(pcb->pcb_ia32_cflg);
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ia64_set_eflag(pcb->pcb_ia32_eflag);
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ia64_set_fcr(pcb->pcb_ia32_fcr);
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ia64_set_fdr(pcb->pcb_ia32_fdr);
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ia64_set_fir(pcb->pcb_ia32_fir);
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ia64_set_fsr(pcb->pcb_ia32_fsr);
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}
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void
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ia32_savectx(struct pcb *pcb)
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{
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pcb->pcb_ia32_cflg = ia64_get_cflg();
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pcb->pcb_ia32_eflag = ia64_get_eflag();
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pcb->pcb_ia32_fcr = ia64_get_fcr();
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pcb->pcb_ia32_fdr = ia64_get_fdr();
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pcb->pcb_ia32_fir = ia64_get_fir();
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pcb->pcb_ia32_fsr = ia64_get_fsr();
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}
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