linux-kernel - Re: [patch 1/8] add user mounts to the kernel

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Message-Id: <E1HfAc0-0002KK-00@dorka.pomaz.szeredi.hu>
Date:	Sat, 21 Apr 2007 10:06:28 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	akpm@...ux-foundation.org
CC:	serue@...ibm.com, viro@....linux.org.uk, linuxram@...ibm.com,
	ebiederm@...ssion.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org
Subject: Re: [patch 1/8] add user mounts to the kernel

> > From: Miklos Szeredi <mszeredi@...e.cz>
> > 
> > Add ownership information to mounts.
> > 
> > A new mount flag, MS_SETUSER is used to make a mount owned by a user.
> > If this flag is specified, then the owner will be set to the current
> > real user id and the mount will be marked with the MNT_USER flag.  On
> > remount don't preserve previous owner, and treat MS_SETUSER as for a
> > new mount.  The MS_SETUSER flag is ignored on mount move.
> 
> So is a modified mount(8) needed?  If so, is there some convenient way
> in which testers can get hold of it?

I haven't yet added this to mount(8).  I'll do that and post patches.

There's an ultra sophisticated mount tester program I use.  It's
slightly user unfriendly...

Miklos

----
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>

int main(int argc, char *argv[])
{
	int res;
	int un = (strrchr(argv[0], '/') ?: argv[0] - 1)[1] == 'u';
	if ((un && argc != 3) || (!un && argc != 6)) {
		fprintf(stderr, "usage: %s %s\n", argv[0],
			un ? "dir flags" : "dev dir type flags opts");
		return 1;
	}
	if (un)
		res = umount2(argv[1], atoi(argv[2]));
	else
		res = mount(argv[1], argv[2], argv[3], atoi(argv[4]), argv[5]);
	if (res == -1) {
		perror(argv[0]);
		return 1;
	}
	return 0;
}

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