linux/fs/fuse
Al Viro 9e1f1de02c more conservative S_NOSEC handling
Caching "we have already removed suid/caps" was overenthusiastic as merged.
On network filesystems we might have had suid/caps set on another client,
silently picked by this client on revalidate, all of that *without* clearing
the S_NOSEC flag.

AFAICS, the only reasonably sane way to deal with that is
	* new superblock flag; unless set, S_NOSEC is not going to be set.
	* local block filesystems set it in their ->mount() (more accurately,
mount_bdev() does, so does btrfs ->mount(), users of mount_bdev() other than
local block ones clear it)
	* if any network filesystem (or a cluster one) wants to use S_NOSEC,
it'll need to set MS_NOSEC in sb->s_flags *AND* take care to clear S_NOSEC when
inode attribute changes are picked from other clients.

It's not an earth-shattering hole (anybody that can set suid on another client
will almost certainly be able to write to the file before doing that anyway),
but it's a bug that needs fixing.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-06-03 18:24:58 -04:00
..
Kconfig fs/Kconfig: move fuse out 2009-01-22 13:15:55 +03:00
Makefile CUSE: implement CUSE - Character device in Userspace 2009-06-09 11:24:11 +02:00
control.c convert get_sb_single() users 2010-10-29 04:16:28 -04:00
cuse.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2011-03-22 10:42:43 -07:00
dev.c mm: add replace_page_cache_page() function 2011-03-22 17:44:02 -07:00
dir.c fuse: remove unnecessary dentry_unhash on rmdir, dir rename 2011-05-28 01:02:53 -04:00
file.c Fix common misspellings 2011-03-31 11:26:23 -03:00
fuse_i.h fuse: reduce size of struct fuse_request 2011-03-21 13:58:05 +01:00
inode.c more conservative S_NOSEC handling 2011-06-03 18:24:58 -04:00