Cleanup unneeded includes, sort the rest according to style(9). No functional changes. MFC after: 2 weeks
955 lines
22 KiB
C
955 lines
22 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2000 Marcel Moolenaar
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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_posix.h"
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#include <sys/param.h>
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#include <sys/imgact_aout.h>
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#include <sys/fcntl.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/racct.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysproto.h>
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#include <sys/vnode.h>
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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#include <machine/frame.h>
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#include <machine/pcb.h> /* needed for pcb definition in linux_set_thread_area */
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#include <machine/psl.h>
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#include <machine/segments.h>
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#include <machine/sysarch.h>
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#include <vm/pmap.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_map.h>
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#include <vm/vm_param.h>
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#include <x86/reg.h>
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#include <i386/linux/linux.h>
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#include <i386/linux/linux_proto.h>
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#include <compat/linux/linux_emul.h>
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#include <compat/linux/linux_fork.h>
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#include <compat/linux/linux_ipc.h>
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#include <compat/linux/linux_misc.h>
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#include <compat/linux/linux_mmap.h>
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#include <compat/linux/linux_signal.h>
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#include <compat/linux/linux_util.h>
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struct l_descriptor {
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l_uint entry_number;
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l_ulong base_addr;
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l_uint limit;
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l_uint seg_32bit:1;
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l_uint contents:2;
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l_uint read_exec_only:1;
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l_uint limit_in_pages:1;
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l_uint seg_not_present:1;
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l_uint useable:1;
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};
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struct l_old_select_argv {
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l_int nfds;
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l_fd_set *readfds;
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l_fd_set *writefds;
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l_fd_set *exceptfds;
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struct l_timeval *timeout;
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};
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struct l_ipc_kludge {
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struct l_msgbuf *msgp;
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l_long msgtyp;
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};
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int
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linux_ipc(struct thread *td, struct linux_ipc_args *args)
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{
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switch (args->what & 0xFFFF) {
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case LINUX_SEMOP: {
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return (kern_semop(td, args->arg1, PTRIN(args->ptr),
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args->arg2, NULL));
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}
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case LINUX_SEMGET: {
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struct linux_semget_args a;
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a.key = args->arg1;
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a.nsems = args->arg2;
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a.semflg = args->arg3;
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return (linux_semget(td, &a));
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}
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case LINUX_SEMCTL: {
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struct linux_semctl_args a;
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int error;
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a.semid = args->arg1;
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a.semnum = args->arg2;
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a.cmd = args->arg3;
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error = copyin(PTRIN(args->ptr), &a.arg, sizeof(a.arg));
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if (error)
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return (error);
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return (linux_semctl(td, &a));
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}
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case LINUX_SEMTIMEDOP: {
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struct linux_semtimedop_args a;
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a.semid = args->arg1;
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a.tsops = PTRIN(args->ptr);
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a.nsops = args->arg2;
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a.timeout = PTRIN(args->arg5);
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return (linux_semtimedop(td, &a));
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}
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case LINUX_MSGSND: {
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struct linux_msgsnd_args a;
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a.msqid = args->arg1;
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a.msgp = PTRIN(args->ptr);
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a.msgsz = args->arg2;
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a.msgflg = args->arg3;
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return (linux_msgsnd(td, &a));
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}
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case LINUX_MSGRCV: {
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struct linux_msgrcv_args a;
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a.msqid = args->arg1;
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a.msgsz = args->arg2;
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a.msgflg = args->arg3;
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if ((args->what >> 16) == 0) {
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struct l_ipc_kludge tmp;
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int error;
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if (args->ptr == 0)
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return (EINVAL);
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error = copyin(PTRIN(args->ptr), &tmp, sizeof(tmp));
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if (error)
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return (error);
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a.msgp = PTRIN(tmp.msgp);
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a.msgtyp = tmp.msgtyp;
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} else {
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a.msgp = PTRIN(args->ptr);
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a.msgtyp = args->arg5;
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}
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return (linux_msgrcv(td, &a));
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}
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case LINUX_MSGGET: {
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struct linux_msgget_args a;
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a.key = args->arg1;
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a.msgflg = args->arg2;
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return (linux_msgget(td, &a));
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}
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case LINUX_MSGCTL: {
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struct linux_msgctl_args a;
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a.msqid = args->arg1;
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a.cmd = args->arg2;
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a.buf = PTRIN(args->ptr);
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return (linux_msgctl(td, &a));
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}
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case LINUX_SHMAT: {
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struct linux_shmat_args a;
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l_uintptr_t addr;
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int error;
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a.shmid = args->arg1;
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a.shmaddr = PTRIN(args->ptr);
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a.shmflg = args->arg2;
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error = linux_shmat(td, &a);
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if (error != 0)
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return (error);
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addr = td->td_retval[0];
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error = copyout(&addr, PTRIN(args->arg3), sizeof(addr));
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td->td_retval[0] = 0;
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return (error);
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}
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case LINUX_SHMDT: {
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struct linux_shmdt_args a;
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a.shmaddr = PTRIN(args->ptr);
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return (linux_shmdt(td, &a));
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}
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case LINUX_SHMGET: {
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struct linux_shmget_args a;
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a.key = args->arg1;
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a.size = args->arg2;
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a.shmflg = args->arg3;
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return (linux_shmget(td, &a));
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}
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case LINUX_SHMCTL: {
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struct linux_shmctl_args a;
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a.shmid = args->arg1;
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a.cmd = args->arg2;
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a.buf = PTRIN(args->ptr);
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return (linux_shmctl(td, &a));
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}
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default:
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break;
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}
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return (EINVAL);
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}
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int
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linux_old_select(struct thread *td, struct linux_old_select_args *args)
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{
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struct l_old_select_argv linux_args;
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struct linux_select_args newsel;
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int error;
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error = copyin(args->ptr, &linux_args, sizeof(linux_args));
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if (error)
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return (error);
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newsel.nfds = linux_args.nfds;
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newsel.readfds = linux_args.readfds;
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newsel.writefds = linux_args.writefds;
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newsel.exceptfds = linux_args.exceptfds;
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newsel.timeout = linux_args.timeout;
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return (linux_select(td, &newsel));
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}
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int
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linux_set_cloned_tls(struct thread *td, void *desc)
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{
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struct segment_descriptor sd;
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struct l_user_desc info;
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int idx, error;
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int a[2];
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error = copyin(desc, &info, sizeof(struct l_user_desc));
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if (error) {
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linux_msg(td, "set_cloned_tls copyin failed!");
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} else {
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idx = info.entry_number;
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/*
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* looks like we're getting the idx we returned
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* in the set_thread_area() syscall
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*/
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if (idx != 6 && idx != 3) {
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linux_msg(td, "set_cloned_tls resetting idx!");
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idx = 3;
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}
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/* this doesnt happen in practice */
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if (idx == 6) {
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/* we might copy out the entry_number as 3 */
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info.entry_number = 3;
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error = copyout(&info, desc, sizeof(struct l_user_desc));
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if (error)
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linux_msg(td, "set_cloned_tls copyout failed!");
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}
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a[0] = LINUX_LDT_entry_a(&info);
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a[1] = LINUX_LDT_entry_b(&info);
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memcpy(&sd, &a, sizeof(a));
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/* set %gs */
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td->td_pcb->pcb_gsd = sd;
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td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
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}
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return (error);
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}
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int
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linux_set_upcall(struct thread *td, register_t stack)
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{
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if (stack)
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td->td_frame->tf_esp = stack;
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/*
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* The newly created Linux thread returns
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* to the user space by the same path that a parent do.
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*/
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td->td_frame->tf_eax = 0;
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return (0);
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}
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int
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linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
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{
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return (linux_mmap_common(td, args->addr, args->len, args->prot,
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args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
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PAGE_SIZE));
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}
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int
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linux_mmap(struct thread *td, struct linux_mmap_args *args)
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{
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int error;
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struct l_mmap_argv linux_args;
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error = copyin(args->ptr, &linux_args, sizeof(linux_args));
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if (error)
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return (error);
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return (linux_mmap_common(td, linux_args.addr, linux_args.len,
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linux_args.prot, linux_args.flags, linux_args.fd,
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(uint32_t)linux_args.pgoff));
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}
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int
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linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
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{
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return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot));
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}
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int
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linux_madvise(struct thread *td, struct linux_madvise_args *uap)
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{
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return (linux_madvise_common(td, PTROUT(uap->addr), uap->len, uap->behav));
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}
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int
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linux_ioperm(struct thread *td, struct linux_ioperm_args *args)
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{
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int error;
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struct i386_ioperm_args iia;
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iia.start = args->start;
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iia.length = args->length;
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iia.enable = args->enable;
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error = i386_set_ioperm(td, &iia);
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return (error);
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}
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int
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linux_iopl(struct thread *td, struct linux_iopl_args *args)
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{
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int error;
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if (args->level < 0 || args->level > 3)
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return (EINVAL);
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if ((error = priv_check(td, PRIV_IO)) != 0)
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return (error);
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if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
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return (error);
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td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) |
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(args->level * (PSL_IOPL / 3));
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return (0);
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}
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int
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linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap)
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{
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int error;
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struct i386_ldt_args ldt;
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struct l_descriptor ld;
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union descriptor desc;
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int size, written;
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switch (uap->func) {
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case 0x00: /* read_ldt */
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ldt.start = 0;
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ldt.descs = uap->ptr;
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ldt.num = uap->bytecount / sizeof(union descriptor);
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error = i386_get_ldt(td, &ldt);
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td->td_retval[0] *= sizeof(union descriptor);
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break;
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case 0x02: /* read_default_ldt = 0 */
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size = 5*sizeof(struct l_desc_struct);
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if (size > uap->bytecount)
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size = uap->bytecount;
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for (written = error = 0; written < size && error == 0; written++)
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error = subyte((char *)uap->ptr + written, 0);
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td->td_retval[0] = written;
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break;
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case 0x01: /* write_ldt */
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case 0x11: /* write_ldt */
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if (uap->bytecount != sizeof(ld))
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return (EINVAL);
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error = copyin(uap->ptr, &ld, sizeof(ld));
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if (error)
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return (error);
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ldt.start = ld.entry_number;
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ldt.descs = &desc;
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ldt.num = 1;
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desc.sd.sd_lolimit = (ld.limit & 0x0000ffff);
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desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16;
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desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff);
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desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24;
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desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) |
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(ld.contents << 2);
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desc.sd.sd_dpl = 3;
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desc.sd.sd_p = (ld.seg_not_present ^ 1);
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desc.sd.sd_xx = 0;
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desc.sd.sd_def32 = ld.seg_32bit;
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desc.sd.sd_gran = ld.limit_in_pages;
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error = i386_set_ldt(td, &ldt, &desc);
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break;
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default:
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error = ENOSYS;
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break;
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}
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if (error == EOPNOTSUPP) {
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linux_msg(td, "modify_ldt needs kernel option USER_LDT");
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error = ENOSYS;
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}
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return (error);
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}
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int
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linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
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{
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l_osigaction_t osa;
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l_sigaction_t act, oact;
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int error;
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if (args->nsa != NULL) {
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error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
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if (error)
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return (error);
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act.lsa_handler = osa.lsa_handler;
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act.lsa_flags = osa.lsa_flags;
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act.lsa_restorer = osa.lsa_restorer;
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LINUX_SIGEMPTYSET(act.lsa_mask);
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act.lsa_mask.__mask = osa.lsa_mask;
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}
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error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
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args->osa ? &oact : NULL);
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if (args->osa != NULL && !error) {
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osa.lsa_handler = oact.lsa_handler;
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osa.lsa_flags = oact.lsa_flags;
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osa.lsa_restorer = oact.lsa_restorer;
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osa.lsa_mask = oact.lsa_mask.__mask;
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error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
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}
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return (error);
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}
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/*
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* Linux has two extra args, restart and oldmask. We dont use these,
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* but it seems that "restart" is actually a context pointer that
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* enables the signal to happen with a different register set.
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*/
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int
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linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
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{
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sigset_t sigmask;
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l_sigset_t mask;
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LINUX_SIGEMPTYSET(mask);
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mask.__mask = args->mask;
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linux_to_bsd_sigset(&mask, &sigmask);
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return (kern_sigsuspend(td, sigmask));
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}
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int
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linux_pause(struct thread *td, struct linux_pause_args *args)
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{
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struct proc *p = td->td_proc;
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sigset_t sigmask;
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PROC_LOCK(p);
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sigmask = td->td_sigmask;
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PROC_UNLOCK(p);
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return (kern_sigsuspend(td, sigmask));
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}
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int
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linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args)
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{
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struct l_user_desc info;
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int error;
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int idx;
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int a[2];
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struct segment_descriptor sd;
|
|
|
|
error = copyin(args->desc, &info, sizeof(struct l_user_desc));
|
|
if (error)
|
|
return (error);
|
|
|
|
idx = info.entry_number;
|
|
/*
|
|
* Semantics of Linux version: every thread in the system has array of
|
|
* 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This
|
|
* syscall loads one of the selected tls decriptors with a value and
|
|
* also loads GDT descriptors 6, 7 and 8 with the content of the
|
|
* per-thread descriptors.
|
|
*
|
|
* Semantics of FreeBSD version: I think we can ignore that Linux has 3
|
|
* per-thread descriptors and use just the 1st one. The tls_array[]
|
|
* is used only in set/get-thread_area() syscalls and for loading the
|
|
* GDT descriptors. In FreeBSD we use just one GDT descriptor for TLS
|
|
* so we will load just one.
|
|
*
|
|
* XXX: this doesn't work when a user space process tries to use more
|
|
* than 1 TLS segment. Comment in the Linux sources says wine might do
|
|
* this.
|
|
*/
|
|
|
|
/*
|
|
* we support just GLIBC TLS now
|
|
* we should let 3 proceed as well because we use this segment so
|
|
* if code does two subsequent calls it should succeed
|
|
*/
|
|
if (idx != 6 && idx != -1 && idx != 3)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* we have to copy out the GDT entry we use
|
|
* FreeBSD uses GDT entry #3 for storing %gs so load that
|
|
*
|
|
* XXX: what if a user space program doesn't check this value and tries
|
|
* to use 6, 7 or 8?
|
|
*/
|
|
idx = info.entry_number = 3;
|
|
error = copyout(&info, args->desc, sizeof(struct l_user_desc));
|
|
if (error)
|
|
return (error);
|
|
|
|
if (LINUX_LDT_empty(&info)) {
|
|
a[0] = 0;
|
|
a[1] = 0;
|
|
} else {
|
|
a[0] = LINUX_LDT_entry_a(&info);
|
|
a[1] = LINUX_LDT_entry_b(&info);
|
|
}
|
|
|
|
memcpy(&sd, &a, sizeof(a));
|
|
/* this is taken from i386 version of cpu_set_user_tls() */
|
|
critical_enter();
|
|
/* set %gs */
|
|
td->td_pcb->pcb_gsd = sd;
|
|
PCPU_GET(fsgs_gdt)[1] = sd;
|
|
load_gs(GSEL(GUGS_SEL, SEL_UPL));
|
|
critical_exit();
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args)
|
|
{
|
|
|
|
struct l_user_desc info;
|
|
int error;
|
|
int idx;
|
|
struct l_desc_struct desc;
|
|
struct segment_descriptor sd;
|
|
|
|
error = copyin(args->desc, &info, sizeof(struct l_user_desc));
|
|
if (error)
|
|
return (error);
|
|
|
|
idx = info.entry_number;
|
|
/* XXX: I am not sure if we want 3 to be allowed too. */
|
|
if (idx != 6 && idx != 3)
|
|
return (EINVAL);
|
|
|
|
idx = 3;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
|
|
sd = PCPU_GET(fsgs_gdt)[1];
|
|
|
|
memcpy(&desc, &sd, sizeof(desc));
|
|
|
|
info.entry_number = idx;
|
|
info.base_addr = LINUX_GET_BASE(&desc);
|
|
info.limit = LINUX_GET_LIMIT(&desc);
|
|
info.seg_32bit = LINUX_GET_32BIT(&desc);
|
|
info.contents = LINUX_GET_CONTENTS(&desc);
|
|
info.read_exec_only = !LINUX_GET_WRITABLE(&desc);
|
|
info.limit_in_pages = LINUX_GET_LIMIT_PAGES(&desc);
|
|
info.seg_not_present = !LINUX_GET_PRESENT(&desc);
|
|
info.useable = LINUX_GET_USEABLE(&desc);
|
|
|
|
error = copyout(&info, args->desc, sizeof(struct l_user_desc));
|
|
if (error)
|
|
return (EFAULT);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* XXX: this wont work with module - convert it */
|
|
int
|
|
linux_mq_open(struct thread *td, struct linux_mq_open_args *args)
|
|
{
|
|
#ifdef P1003_1B_MQUEUE
|
|
return (sys_kmq_open(td, (struct kmq_open_args *)args));
|
|
#else
|
|
return (ENOSYS);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args)
|
|
{
|
|
#ifdef P1003_1B_MQUEUE
|
|
return (sys_kmq_unlink(td, (struct kmq_unlink_args *)args));
|
|
#else
|
|
return (ENOSYS);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args)
|
|
{
|
|
#ifdef P1003_1B_MQUEUE
|
|
return (sys_kmq_timedsend(td, (struct kmq_timedsend_args *)args));
|
|
#else
|
|
return (ENOSYS);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args)
|
|
{
|
|
#ifdef P1003_1B_MQUEUE
|
|
return (sys_kmq_timedreceive(td, (struct kmq_timedreceive_args *)args));
|
|
#else
|
|
return (ENOSYS);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args)
|
|
{
|
|
#ifdef P1003_1B_MQUEUE
|
|
return (sys_kmq_notify(td, (struct kmq_notify_args *)args));
|
|
#else
|
|
return (ENOSYS);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args)
|
|
{
|
|
#ifdef P1003_1B_MQUEUE
|
|
return (sys_kmq_setattr(td, (struct kmq_setattr_args *)args));
|
|
#else
|
|
return (ENOSYS);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
bsd_to_linux_regset(const struct reg *b_reg,
|
|
struct linux_pt_regset *l_regset)
|
|
{
|
|
|
|
l_regset->ebx = b_reg->r_ebx;
|
|
l_regset->ecx = b_reg->r_ecx;
|
|
l_regset->edx = b_reg->r_edx;
|
|
l_regset->esi = b_reg->r_esi;
|
|
l_regset->edi = b_reg->r_edi;
|
|
l_regset->ebp = b_reg->r_ebp;
|
|
l_regset->eax = b_reg->r_eax;
|
|
l_regset->ds = b_reg->r_ds;
|
|
l_regset->es = b_reg->r_es;
|
|
l_regset->fs = b_reg->r_fs;
|
|
l_regset->gs = b_reg->r_gs;
|
|
l_regset->orig_eax = b_reg->r_eax;
|
|
l_regset->eip = b_reg->r_eip;
|
|
l_regset->cs = b_reg->r_cs;
|
|
l_regset->eflags = b_reg->r_eflags;
|
|
l_regset->esp = b_reg->r_esp;
|
|
l_regset->ss = b_reg->r_ss;
|
|
}
|
|
|
|
int
|
|
linux_uselib(struct thread *td, struct linux_uselib_args *args)
|
|
{
|
|
struct nameidata ni;
|
|
struct vnode *vp;
|
|
struct exec *a_out;
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
struct vattr attr;
|
|
vm_offset_t vmaddr;
|
|
unsigned long file_offset;
|
|
unsigned long bss_size;
|
|
char *library;
|
|
ssize_t aresid;
|
|
int error;
|
|
bool locked, opened, textset;
|
|
|
|
a_out = NULL;
|
|
vp = NULL;
|
|
locked = false;
|
|
textset = false;
|
|
opened = false;
|
|
|
|
if (!LUSECONVPATH(td)) {
|
|
NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1,
|
|
UIO_USERSPACE, args->library);
|
|
error = namei(&ni);
|
|
} else {
|
|
LCONVPATHEXIST(args->library, &library);
|
|
NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1,
|
|
UIO_SYSSPACE, library);
|
|
error = namei(&ni);
|
|
LFREEPATH(library);
|
|
}
|
|
if (error)
|
|
goto cleanup;
|
|
|
|
vp = ni.ni_vp;
|
|
NDFREE_PNBUF(&ni);
|
|
|
|
/*
|
|
* From here on down, we have a locked vnode that must be unlocked.
|
|
* XXX: The code below largely duplicates exec_check_permissions().
|
|
*/
|
|
locked = true;
|
|
|
|
/* Executable? */
|
|
error = VOP_GETATTR(vp, &attr, td->td_ucred);
|
|
if (error)
|
|
goto cleanup;
|
|
|
|
if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
|
|
((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) {
|
|
/* EACCESS is what exec(2) returns. */
|
|
error = ENOEXEC;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Sensible size? */
|
|
if (attr.va_size == 0) {
|
|
error = ENOEXEC;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Can we access it? */
|
|
error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
|
|
if (error)
|
|
goto cleanup;
|
|
|
|
/*
|
|
* XXX: This should use vn_open() so that it is properly authorized,
|
|
* and to reduce code redundancy all over the place here.
|
|
* XXX: Not really, it duplicates far more of exec_check_permissions()
|
|
* than vn_open().
|
|
*/
|
|
#ifdef MAC
|
|
error = mac_vnode_check_open(td->td_ucred, vp, VREAD);
|
|
if (error)
|
|
goto cleanup;
|
|
#endif
|
|
error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
|
|
if (error)
|
|
goto cleanup;
|
|
opened = true;
|
|
|
|
/* Pull in executable header into exec_map */
|
|
error = vm_mmap(exec_map, (vm_offset_t *)&a_out, PAGE_SIZE,
|
|
VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0);
|
|
if (error)
|
|
goto cleanup;
|
|
|
|
/* Is it a Linux binary ? */
|
|
if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
|
|
error = ENOEXEC;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* While we are here, we should REALLY do some more checks
|
|
*/
|
|
|
|
/* Set file/virtual offset based on a.out variant. */
|
|
switch ((int)(a_out->a_magic & 0xffff)) {
|
|
case 0413: /* ZMAGIC */
|
|
file_offset = 1024;
|
|
break;
|
|
case 0314: /* QMAGIC */
|
|
file_offset = 0;
|
|
break;
|
|
default:
|
|
error = ENOEXEC;
|
|
goto cleanup;
|
|
}
|
|
|
|
bss_size = round_page(a_out->a_bss);
|
|
|
|
/* Check various fields in header for validity/bounds. */
|
|
if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
|
|
error = ENOEXEC;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* text + data can't exceed file size */
|
|
if (a_out->a_data + a_out->a_text > attr.va_size) {
|
|
error = EFAULT;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* text/data/bss must not exceed limits
|
|
* XXX - this is not complete. it should check current usage PLUS
|
|
* the resources needed by this library.
|
|
*/
|
|
PROC_LOCK(td->td_proc);
|
|
if (a_out->a_text > maxtsiz ||
|
|
a_out->a_data + bss_size > lim_cur_proc(td->td_proc, RLIMIT_DATA) ||
|
|
racct_set(td->td_proc, RACCT_DATA, a_out->a_data +
|
|
bss_size) != 0) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
error = ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
|
|
/*
|
|
* Prevent more writers.
|
|
*/
|
|
error = VOP_SET_TEXT(vp);
|
|
if (error != 0)
|
|
goto cleanup;
|
|
textset = true;
|
|
|
|
/*
|
|
* Lock no longer needed
|
|
*/
|
|
locked = false;
|
|
VOP_UNLOCK(vp);
|
|
|
|
/*
|
|
* Check if file_offset page aligned. Currently we cannot handle
|
|
* misalinged file offsets, and so we read in the entire image
|
|
* (what a waste).
|
|
*/
|
|
if (file_offset & PAGE_MASK) {
|
|
/* Map text+data read/write/execute */
|
|
|
|
/* a_entry is the load address and is page aligned */
|
|
vmaddr = trunc_page(a_out->a_entry);
|
|
|
|
/* get anon user mapping, read+write+execute */
|
|
error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
|
|
&vmaddr, a_out->a_text + a_out->a_data, 0, VMFS_NO_SPACE,
|
|
VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
if (error)
|
|
goto cleanup;
|
|
|
|
error = vn_rdwr(UIO_READ, vp, (void *)vmaddr, file_offset,
|
|
a_out->a_text + a_out->a_data, UIO_USERSPACE, 0,
|
|
td->td_ucred, NOCRED, &aresid, td);
|
|
if (error != 0)
|
|
goto cleanup;
|
|
if (aresid != 0) {
|
|
error = ENOEXEC;
|
|
goto cleanup;
|
|
}
|
|
} else {
|
|
/*
|
|
* for QMAGIC, a_entry is 20 bytes beyond the load address
|
|
* to skip the executable header
|
|
*/
|
|
vmaddr = trunc_page(a_out->a_entry);
|
|
|
|
/*
|
|
* Map it all into the process's space as a single
|
|
* copy-on-write "data" segment.
|
|
*/
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
error = vm_mmap(map, &vmaddr,
|
|
a_out->a_text + a_out->a_data, VM_PROT_ALL, VM_PROT_ALL,
|
|
MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, file_offset);
|
|
if (error)
|
|
goto cleanup;
|
|
vm_map_lock(map);
|
|
if (!vm_map_lookup_entry(map, vmaddr, &entry)) {
|
|
vm_map_unlock(map);
|
|
error = EDOOFUS;
|
|
goto cleanup;
|
|
}
|
|
entry->eflags |= MAP_ENTRY_VN_EXEC;
|
|
vm_map_unlock(map);
|
|
textset = false;
|
|
}
|
|
|
|
if (bss_size != 0) {
|
|
/* Calculate BSS start address */
|
|
vmaddr = trunc_page(a_out->a_entry) + a_out->a_text +
|
|
a_out->a_data;
|
|
|
|
/* allocate some 'anon' space */
|
|
error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
|
|
&vmaddr, bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL,
|
|
VM_PROT_ALL, 0);
|
|
if (error)
|
|
goto cleanup;
|
|
}
|
|
|
|
cleanup:
|
|
if (opened) {
|
|
if (locked)
|
|
VOP_UNLOCK(vp);
|
|
locked = false;
|
|
VOP_CLOSE(vp, FREAD, td->td_ucred, td);
|
|
}
|
|
if (textset) {
|
|
if (!locked) {
|
|
locked = true;
|
|
VOP_LOCK(vp, LK_SHARED | LK_RETRY);
|
|
}
|
|
VOP_UNSET_TEXT_CHECKED(vp);
|
|
}
|
|
if (locked)
|
|
VOP_UNLOCK(vp);
|
|
|
|
/* Release the temporary mapping. */
|
|
if (a_out)
|
|
kmap_free_wakeup(exec_map, (vm_offset_t)a_out, PAGE_SIZE);
|
|
|
|
return (error);
|
|
}
|