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      1 /*	$NetBSD: procfs_auxv.c,v 1.4 2019/09/27 14:36:18 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2017 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: procfs_auxv.c,v 1.4 2019/09/27 14:36:18 christos Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/proc.h>
     37 #include <sys/kmem.h>
     38 
     39 #include <miscfs/procfs/procfs.h>
     40 
     41 int
     42 procfs_doauxv(struct lwp *curl, struct proc *p, struct pfsnode *pfs,
     43      struct uio *uio)
     44 {
     45 	int error;
     46 	void *buffer;
     47 	size_t bufsize;
     48 
     49 	if (uio->uio_rw != UIO_READ)
     50 		return EOPNOTSUPP;
     51 
     52 	if ((error = proc_getauxv(p, &buffer, &bufsize)) != 0)
     53 		return error;
     54 
     55 	if ((uintmax_t)uio->uio_offset < bufsize)
     56 		error = uiomove((char *)buffer + uio->uio_offset,
     57 		    bufsize - uio->uio_offset, uio);
     58 	else
     59 		error = 0;
     60 
     61 	kmem_free(buffer, bufsize);
     62 	return error;
     63 }
     64 
     65 int
     66 procfs_validauxv(struct lwp *l, struct mount *mp)
     67 {
     68 	return l != NULL && l->l_proc != NULL && l->l_proc->p_execsw != NULL;
     69 }
     70