system.c

/*
 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "defs.h"

#define MS_RDONLY	 1	/* Mount read-only */
#define MS_NOSUID	 2	/* Ignore suid and sgid bits */
#define MS_NODEV	 4	/* Disallow access to device special files */
#define MS_NOEXEC	 8	/* Disallow program execution */
#define MS_SYNCHRONOUS	16	/* Writes are synced at once */
#define MS_REMOUNT	32	/* Alter flags of a mounted FS */
#define MS_MANDLOCK	64	/* Allow mandatory locks on an FS */
#define MS_DIRSYNC	128	/* Directory modifications are synchronous */
#define MS_NOATIME	1024	/* Do not update access times. */
#define MS_NODIRATIME	2048	/* Do not update directory access times */
#define MS_BIND		4096
#define MS_MOVE		8192
#define MS_REC		16384
#define MS_SILENT	32768
#define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */
#define MS_UNBINDABLE	(1<<17)	/* change to unbindable */
#define MS_PRIVATE	(1<<18)	/* change to private */
#define MS_SLAVE	(1<<19)	/* change to slave */
#define MS_SHARED	(1<<20)	/* change to shared */
#define MS_RELATIME	(1<<21)
#define MS_KERNMOUNT	(1<<22)
#define MS_I_VERSION	(1<<23)
#define MS_STRICTATIME	(1<<24)
#define MS_NOSEC	(1<<28)
#define MS_BORN		(1<<29)
#define MS_ACTIVE	(1<<30)
#define MS_NOUSER	(1<<31)
#define MS_MGC_VAL	0xc0ed0000	/* Magic flag number */
#define MS_MGC_MSK	0xffff0000	/* Magic flag mask */

#include <linux/personality.h>

#include "xlat/mount_flags.h"

int
sys_mount(struct tcb *tcp)
{
	if (entering(tcp)) {
		int ignore_type = 0, ignore_data = 0;
		unsigned long flags = tcp->u_arg[3];

		/* Discard magic */
		if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
			flags &= ~MS_MGC_MSK;

		if (flags & MS_REMOUNT)
			ignore_type = 1;
		else if (flags & (MS_BIND | MS_MOVE))
			ignore_type = ignore_data = 1;

		printpath(tcp, tcp->u_arg[0]);
		tprints(", ");

		printpath(tcp, tcp->u_arg[1]);
		tprints(", ");

		if (ignore_type && tcp->u_arg[2])
			tprintf("%#lx", tcp->u_arg[2]);
		else
			printstr(tcp, tcp->u_arg[2], -1);
		tprints(", ");

		printflags(mount_flags, tcp->u_arg[3], "MS_???");
		tprints(", ");

		if (ignore_data && tcp->u_arg[4])
			tprintf("%#lx", tcp->u_arg[4]);
		else
			printstr(tcp, tcp->u_arg[4], -1);
	}
	return 0;
}

#define MNT_FORCE	0x00000001	/* Attempt to forcibily umount */
#define MNT_DETACH	0x00000002	/* Just detach from the tree */
#define MNT_EXPIRE	0x00000004	/* Mark for expiry */

#include "xlat/umount_flags.h"

int
sys_umount2(struct tcb *tcp)
{
	if (entering(tcp)) {
		printstr(tcp, tcp->u_arg[0], -1);
		tprints(", ");
		printflags(umount_flags, tcp->u_arg[1], "MNT_???");
	}
	return 0;
}

/* These are not macros, but enums.  We just copy the values by hand
   from Linux 2.6.9 here.  */
#include "xlat/personality_options.h"

int
sys_personality(struct tcb *tcp)
{
	if (entering(tcp))
		printxval(personality_options, tcp->u_arg[0], "PER_???");
	return 0;
}