From: Miklos Szeredi <mszeredi@suse.cz>
Date: Wed, 10 Feb 2010 11:15:53 +0000 (+0100)
Subject: vfs: add NOFOLLOW flag to umount(2)
X-Git-Tag: v2.6.27.48~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23b5e014564bb71eb05871af019912957263f158;p=pandora-kernel.git

vfs: add NOFOLLOW flag to umount(2)

commit db1f05bb85d7966b9176e293f3ceead1cb8b5d79 upstream.

Add a new UMOUNT_NOFOLLOW flag to umount(2).  This is needed to prevent
symlink attacks in unprivileged unmounts (fuse, samba, ncpfs).

Additionally, return -EINVAL if an unknown flag is used (and specify
an explicitly unused flag: UMOUNT_UNUSED).  This makes it possible for
the caller to determine if a flag is supported or not.

CC: Eugene Teo <eugene@redhat.com>
CC: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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