550 lines
14 KiB
C
550 lines
14 KiB
C
/* $NetBSD: vfs_syscalls_43.c,v 1.65 2020/02/27 18:19:16 pgoyette Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_43.c,v 1.65 2020/02/27 18:19:16 pgoyette Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_compat_netbsd.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/dirent.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/stat.h>
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#include <sys/malloc.h>
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#include <sys/ioctl.h>
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#include <sys/fcntl.h>
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#include <sys/syslog.h>
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#include <sys/unistd.h>
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#include <sys/resourcevar.h>
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#include <sys/mount.h>
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#include <sys/syscall.h>
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#include <sys/syscallvar.h>
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#include <sys/syscallargs.h>
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#include <sys/vfs_syscalls.h>
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#include <compat/sys/stat.h>
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#include <compat/sys/mount.h>
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#include <compat/sys/dirent.h>
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#include <compat/common/compat_util.h>
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#include <compat/common/compat_mod.h>
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static void cvttimespec(struct timespec *, struct timespec50 *);
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static void cvtstat(struct stat *, struct stat43 *);
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static struct syscall_package vfs_syscalls_43_syscalls[] = {
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{ SYS_compat_43_oquota, 0, (sy_call_t *)compat_43_sys_quota },
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{ SYS_compat_43_stat43, 0, (sy_call_t *)compat_43_sys_stat },
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{ SYS_compat_43_lstat43, 0, (sy_call_t *)compat_43_sys_lstat },
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{ SYS_compat_43_fstat43, 0, (sy_call_t *)compat_43_sys_fstat },
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{ SYS_compat_43_otruncate, 0, (sy_call_t *)compat_43_sys_ftruncate },
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{ SYS_compat_43_oftruncate, 0, (sy_call_t *)compat_43_sys_ftruncate },
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{ SYS_compat_43_olseek, 0, (sy_call_t *)compat_43_sys_lseek },
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{ SYS_compat_43_ocreat, 0, (sy_call_t *)compat_43_sys_creat },
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{ SYS_compat_43_ogetdirentries, 0,
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(sy_call_t *)compat_43_sys_getdirentries },
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{ 0, 0, NULL }
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};
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/*
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* Convert from an old to a new timespec structure.
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*/
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static void
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cvttimespec(struct timespec *ts, struct timespec50 *ots)
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{
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if (ts->tv_sec > INT_MAX) {
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#if defined(DEBUG) || 1
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static bool first = true;
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if (first) {
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first = false;
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printf("%s[%s:%d]: time_t does not fit\n",
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__func__, curlwp->l_proc->p_comm,
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curlwp->l_lid);
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}
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#endif
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ots->tv_sec = INT_MAX;
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} else
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ots->tv_sec = ts->tv_sec;
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ots->tv_nsec = ts->tv_nsec;
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}
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/*
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* Convert from an old to a new stat structure.
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*/
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static void
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cvtstat(struct stat *st, struct stat43 *ost)
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{
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/* Handle any padding. */
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memset(ost, 0, sizeof *ost);
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ost->st_dev = st->st_dev;
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ost->st_ino = st->st_ino;
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ost->st_mode = st->st_mode & 0xffff;
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ost->st_nlink = st->st_nlink;
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ost->st_uid = st->st_uid;
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ost->st_gid = st->st_gid;
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ost->st_rdev = st->st_rdev;
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if (st->st_size < (quad_t)1 << 32)
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ost->st_size = st->st_size;
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else
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ost->st_size = -2;
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cvttimespec(&st->st_atimespec, &ost->st_atimespec);
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cvttimespec(&st->st_mtimespec, &ost->st_mtimespec);
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cvttimespec(&st->st_ctimespec, &ost->st_ctimespec);
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ost->st_blksize = st->st_blksize;
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ost->st_blocks = st->st_blocks;
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ost->st_flags = st->st_flags;
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ost->st_gen = st->st_gen;
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}
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/*
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* Get file status; this version follows links.
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*/
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/* ARGSUSED */
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int
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compat_43_sys_stat(struct lwp *l, const struct compat_43_sys_stat_args *uap, register_t *retval)
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{
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/* {
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syscallarg(char *) path;
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syscallarg(struct stat43 *) ub;
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} */
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struct stat sb;
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struct stat43 osb;
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int error;
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error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb);
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if (error)
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return (error);
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cvtstat(&sb, &osb);
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error = copyout((void *)&osb, (void *)SCARG(uap, ub), sizeof (osb));
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return (error);
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}
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/*
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* Get file status; this version does not follow links.
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*/
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/* ARGSUSED */
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int
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compat_43_sys_lstat(struct lwp *l, const struct compat_43_sys_lstat_args *uap, register_t *retval)
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{
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/* {
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syscallarg(char *) path;
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syscallarg(struct ostat *) ub;
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} */
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struct vnode *vp, *dvp;
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struct stat sb, sb1;
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struct stat43 osb;
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int error;
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struct pathbuf *pb;
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struct nameidata nd;
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int ndflags;
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error = pathbuf_copyin(SCARG(uap, path), &pb);
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if (error) {
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return error;
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}
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ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT | TRYEMULROOT;
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again:
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NDINIT(&nd, LOOKUP, ndflags, pb);
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if ((error = namei(&nd))) {
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if (error == EISDIR && (ndflags & LOCKPARENT) != 0) {
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/*
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* Should only happen on '/'. Retry without LOCKPARENT;
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* this is safe since the vnode won't be a VLNK.
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*/
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ndflags &= ~LOCKPARENT;
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goto again;
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}
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pathbuf_destroy(pb);
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return (error);
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}
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/*
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* For symbolic links, always return the attributes of its
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* containing directory, except for mode, size, and links.
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*/
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vp = nd.ni_vp;
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dvp = nd.ni_dvp;
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pathbuf_destroy(pb);
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if (vp->v_type != VLNK) {
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if ((ndflags & LOCKPARENT) != 0) {
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if (dvp == vp)
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vrele(dvp);
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else
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vput(dvp);
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}
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error = vn_stat(vp, &sb);
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vput(vp);
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if (error)
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return (error);
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} else {
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error = vn_stat(dvp, &sb);
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vput(dvp);
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if (error) {
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vput(vp);
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return (error);
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}
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error = vn_stat(vp, &sb1);
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vput(vp);
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if (error)
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return (error);
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sb.st_mode &= ~S_IFDIR;
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sb.st_mode |= S_IFLNK;
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sb.st_nlink = sb1.st_nlink;
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sb.st_size = sb1.st_size;
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sb.st_blocks = sb1.st_blocks;
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}
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cvtstat(&sb, &osb);
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error = copyout((void *)&osb, (void *)SCARG(uap, ub), sizeof (osb));
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return (error);
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}
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/*
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* Return status information about a file descriptor.
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*/
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/* ARGSUSED */
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int
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compat_43_sys_fstat(struct lwp *l, const struct compat_43_sys_fstat_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) fd;
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syscallarg(struct stat43 *) sb;
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} */
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struct stat ub;
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struct stat43 oub;
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int error;
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error = do_sys_fstat(SCARG(uap, fd), &ub);
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if (error == 0) {
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cvtstat(&ub, &oub);
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error = copyout((void *)&oub, (void *)SCARG(uap, sb),
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sizeof (oub));
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}
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return (error);
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}
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/*
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* Truncate a file given a file descriptor.
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*/
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/* ARGSUSED */
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int
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compat_43_sys_ftruncate(struct lwp *l, const struct compat_43_sys_ftruncate_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) fd;
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syscallarg(long) length;
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} */
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struct sys_ftruncate_args /* {
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syscallarg(int) fd;
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syscallarg(int) pad;
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syscallarg(off_t) length;
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} */ nuap;
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SCARG(&nuap, fd) = SCARG(uap, fd);
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SCARG(&nuap, length) = SCARG(uap, length);
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return (sys_ftruncate(l, &nuap, retval));
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}
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/*
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* Truncate a file given its path name.
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*/
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/* ARGSUSED */
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int
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compat_43_sys_truncate(struct lwp *l, const struct compat_43_sys_truncate_args *uap, register_t *retval)
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{
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/* {
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syscallarg(char *) path;
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syscallarg(long) length;
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} */
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struct sys_truncate_args /* {
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syscallarg(char *) path;
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syscallarg(int) pad;
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syscallarg(off_t) length;
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} */ nuap;
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SCARG(&nuap, path) = SCARG(uap, path);
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SCARG(&nuap, length) = SCARG(uap, length);
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return (sys_truncate(l, &nuap, retval));
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}
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/*
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* Reposition read/write file offset.
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*/
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int
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compat_43_sys_lseek(struct lwp *l, const struct compat_43_sys_lseek_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) fd;
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syscallarg(long) offset;
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syscallarg(int) whence;
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} */
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struct sys_lseek_args /* {
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syscallarg(int) fd;
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syscallarg(int) pad;
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syscallarg(off_t) offset;
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syscallarg(int) whence;
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} */ nuap;
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off_t qret;
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int error;
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SCARG(&nuap, fd) = SCARG(uap, fd);
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SCARG(&nuap, offset) = SCARG(uap, offset);
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SCARG(&nuap, whence) = SCARG(uap, whence);
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error = sys_lseek(l, &nuap, (register_t *)&qret);
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*(long *)retval = qret;
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return (error);
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}
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/*
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* Create a file.
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*/
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int
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compat_43_sys_creat(struct lwp *l, const struct compat_43_sys_creat_args *uap, register_t *retval)
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{
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/* {
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syscallarg(char *) path;
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syscallarg(int) mode;
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} */
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struct sys_open_args /* {
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syscallarg(char *) path;
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syscallarg(int) flags;
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syscallarg(int) mode;
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} */ nuap;
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SCARG(&nuap, path) = SCARG(uap, path);
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SCARG(&nuap, mode) = SCARG(uap, mode);
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SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC;
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return (sys_open(l, &nuap, retval));
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}
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/*ARGSUSED*/
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int
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compat_43_sys_quota(struct lwp *l, const void *v, register_t *retval)
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{
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return (ENOSYS);
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}
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/*
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* Read a block of directory entries in a file system independent format.
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*/
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int
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compat_43_sys_getdirentries(struct lwp *l, const struct compat_43_sys_getdirentries_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) fd;
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syscallarg(char *) buf;
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syscallarg(u_int) count;
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syscallarg(long *) basep;
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} */
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struct dirent *bdp;
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struct vnode *vp;
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void *tbuf; /* Current-format */
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char *inp; /* Current-format */
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int len, reclen; /* Current-format */
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char *outp; /* Dirent12-format */
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int resid, old_reclen = 0; /* Dirent12-format */
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struct file *fp;
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struct uio auio;
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struct iovec aiov;
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struct dirent43 idb;
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off_t off; /* true file offset */
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int buflen, error, eofflag, nbytes;
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struct vattr va;
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off_t *cookiebuf = NULL, *cookie;
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int ncookies;
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long loff;
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/* fd_getvnode() will use the descriptor for us */
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if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
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return (error);
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if ((fp->f_flag & FREAD) == 0) {
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error = EBADF;
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goto out1;
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}
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vp = fp->f_vnode;
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if (vp->v_type != VDIR) {
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error = ENOTDIR;
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goto out1;
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}
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vn_lock(vp, LK_SHARED | LK_RETRY);
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error = VOP_GETATTR(vp, &va, l->l_cred);
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VOP_UNLOCK(vp);
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if (error)
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goto out1;
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loff = fp->f_offset;
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nbytes = SCARG(uap, count);
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buflen = uimin(MAXBSIZE, nbytes);
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if (buflen < va.va_blocksize)
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buflen = va.va_blocksize;
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tbuf = malloc(buflen, M_TEMP, M_WAITOK);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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off = fp->f_offset;
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again:
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aiov.iov_base = tbuf;
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aiov.iov_len = buflen;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_rw = UIO_READ;
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auio.uio_resid = buflen;
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auio.uio_offset = off;
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UIO_SETUP_SYSSPACE(&auio);
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/*
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* First we read into the malloc'ed buffer, then
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* we massage it into user space, one record at a time.
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*/
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error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
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&ncookies);
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if (error)
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goto out;
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inp = (char *)tbuf;
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outp = SCARG(uap, buf);
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resid = nbytes;
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if ((len = buflen - auio.uio_resid) == 0)
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goto eof;
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for (cookie = cookiebuf; len > 0; len -= reclen) {
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bdp = (struct dirent *)inp;
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reclen = bdp->d_reclen;
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if (reclen & 3) {
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error = EIO;
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goto out;
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}
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if (bdp->d_fileno == 0) {
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inp += reclen; /* it is a hole; squish it out */
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if (cookie)
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off = *cookie++;
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else
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off += reclen;
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continue;
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}
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if (bdp->d_namlen >= sizeof(idb.d_name))
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idb.d_namlen = sizeof(idb.d_name) - 1;
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else
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idb.d_namlen = bdp->d_namlen;
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old_reclen = _DIRENT_RECLEN(&idb, bdp->d_namlen);
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if (reclen > len || resid < old_reclen) {
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/* entry too big for buffer, so just stop */
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outp++;
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break;
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}
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/*
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* Massage in place to make a Dirent12-shaped dirent (otherwise
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* we have to worry about touching user memory outside of
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* the copyout() call).
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*/
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idb.d_fileno = (uint32_t)bdp->d_fileno;
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idb.d_reclen = (uint16_t)old_reclen;
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idb.d_fileno = (uint32_t)bdp->d_fileno;
|
|
(void)memcpy(idb.d_name, bdp->d_name, idb.d_namlen);
|
|
memset(idb.d_name + idb.d_namlen, 0,
|
|
idb.d_reclen - _DIRENT_NAMEOFF(&idb) - idb.d_namlen);
|
|
if ((error = copyout(&idb, outp, old_reclen)))
|
|
goto out;
|
|
/* advance past this real entry */
|
|
inp += reclen;
|
|
if (cookie)
|
|
off = *cookie++; /* each entry points to itself */
|
|
else
|
|
off += reclen;
|
|
/* advance output past Dirent12-shaped entry */
|
|
outp += old_reclen;
|
|
resid -= old_reclen;
|
|
}
|
|
|
|
/* if we squished out the whole block, try again */
|
|
if (outp == SCARG(uap, buf)) {
|
|
if (cookiebuf)
|
|
free(cookiebuf, M_TEMP);
|
|
cookiebuf = NULL;
|
|
goto again;
|
|
}
|
|
fp->f_offset = off; /* update the vnode offset */
|
|
|
|
eof:
|
|
*retval = nbytes - resid;
|
|
out:
|
|
VOP_UNLOCK(vp);
|
|
if (cookiebuf)
|
|
free(cookiebuf, M_TEMP);
|
|
free(tbuf, M_TEMP);
|
|
out1:
|
|
fd_putfile(SCARG(uap, fd));
|
|
if (error)
|
|
return error;
|
|
return copyout(&loff, SCARG(uap, basep), sizeof(long));
|
|
}
|
|
|
|
int
|
|
vfs_syscalls_43_init(void)
|
|
{
|
|
|
|
return syscall_establish(NULL, vfs_syscalls_43_syscalls);
|
|
}
|
|
|
|
int
|
|
vfs_syscalls_43_fini(void)
|
|
{
|
|
|
|
return syscall_disestablish(NULL, vfs_syscalls_43_syscalls);
|
|
}
|