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      1 /*	$NetBSD: netbsd32_fd.c,v 1.1 2018/12/24 21:27:05 mrg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998, 2001, 2008, 2018 Matthew R. Green
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * from: NetBSD: netbsd32_netbsd.c,v 1.221 2018/12/24 20:44:39 mrg Exp
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: netbsd32_fd.c,v 1.1 2018/12/24 21:27:05 mrg Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/filedesc.h>
     37 #include <sys/namei.h>
     38 #include <sys/vnode.h>
     39 #include <sys/vfs_syscalls.h>
     40 #include <sys/kauth.h>
     41 
     42 #include <compat/netbsd32/netbsd32.h>
     43 #include <compat/netbsd32/netbsd32_syscall.h>
     44 #include <compat/netbsd32/netbsd32_syscallargs.h>
     45 #include <compat/netbsd32/netbsd32_conv.h>
     46 
     47 
     48 int
     49 netbsd32___getfh30(struct lwp *l, const struct netbsd32___getfh30_args *uap, register_t *retval)
     50 {
     51 	/* {
     52 		syscallarg(const netbsd32_charp) fname;
     53 		syscallarg(netbsd32_fhandlep_t) fhp;
     54 		syscallarg(netbsd32_size_tp) fh_size;
     55 	} */
     56 	struct vnode *vp;
     57 	fhandle_t *fh;
     58 	int error;
     59 	struct pathbuf *pb;
     60 	struct nameidata nd;
     61 	netbsd32_size_t usz32, sz32;
     62 	size_t sz;
     63 
     64 	/*
     65 	 * Must be super user
     66 	 */
     67 	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE,
     68 	    0, NULL, NULL, NULL);
     69 	if (error)
     70 		return error;
     71 
     72 	error = pathbuf_copyin(SCARG_P32(uap, fname), &pb);
     73 	if (error) {
     74 		return error;
     75 	}
     76 
     77 	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb);
     78 	error = namei(&nd);
     79 	if (error) {
     80 		pathbuf_destroy(pb);
     81 		return error;
     82 	}
     83 	vp = nd.ni_vp;
     84 	pathbuf_destroy(pb);
     85 
     86 	error = vfs_composefh_alloc(vp, &fh);
     87 	vput(vp);
     88 	if (error != 0) {
     89 		return error;
     90 	}
     91 	error = copyin(SCARG_P32(uap, fh_size), &usz32, sizeof(usz32));
     92 	if (error != 0) {
     93 		goto out;
     94 	}
     95 	sz = FHANDLE_SIZE(fh);
     96 	sz32 = sz;
     97 
     98 	error = copyout(&sz32, SCARG_P32(uap, fh_size), sizeof(sz32));
     99 	if (error != 0) {
    100 		goto out;
    101 	}
    102 	if (usz32 >= sz32) {
    103 		error = copyout(fh, SCARG_P32(uap, fhp), sz);
    104 	} else {
    105 		error = E2BIG;
    106 	}
    107 out:
    108 	vfs_composefh_free(fh);
    109 	return error;
    110 }
    111 
    112 int
    113 netbsd32_pipe2(struct lwp *l, const struct netbsd32_pipe2_args *uap,
    114 	       register_t *retval)
    115 {
    116 	/* {
    117 		syscallarg(netbsd32_intp) fildes;
    118 		syscallarg(int) flags;
    119 	} */
    120 	int fd[2], error;
    121 
    122 	error = pipe1(l, fd, SCARG(uap, flags));
    123 	if (error != 0)
    124 		return error;
    125 
    126 	error = copyout(fd, SCARG_P32(uap, fildes), sizeof(fd));
    127 	if (error != 0)
    128 		return error;
    129 
    130 	retval[0] = 0;
    131 	return 0;
    132 }
    133