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authorMiklos Szeredi <mszeredi@suse.cz>2010-02-10 12:15:53 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2010-03-03 14:08:00 -0500
commitdb1f05bb85d7966b9176e293f3ceead1cb8b5d79 (patch)
tree65a1d746f84cb8aa9be2a69c59eb627859b9fa0d /include
parent440b3c6c160f7d0a985f24ad1f4c24e00ee2d936 (diff)
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vfs: add NOFOLLOW flag to umount(2)
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>
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 e764f24..5b3182c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1305,6 +1305,8 @@ 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;
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