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authorMiklos Szeredi <mszeredi@suse.cz>2010-02-10 12:15:53 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-07-05 11:16:09 -0700
commit7ab3c6bcc33237784b5dd8ef86062d488fd65576 (patch)
treec1c7d87f17740de1d82fc19a15583746afdfdd27 /include
parent8c11d9038537657cc74fb8d2242fd18c3d6a05d5 (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 81288f0d7178..899a4d6985d4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1308,6 +1308,8 @@ extern int send_sigurg(struct fown_struct *fown);
#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
#define MNT_DETACH 0x00000002 /* Just detach from the tree */
#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
+#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
+#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
extern struct list_head super_blocks;
extern spinlock_t sb_lock;