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authorAl Viro <viro@zeniv.linux.org.uk>2011-06-03 18:24:58 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-06-03 18:24:58 -0400
commit9e1f1de02c2275d7172e18dc4e7c2065777611bf (patch)
tree15e9d202e64275cdbff6ed1d54804da5966d7d8d /drivers/parport
parent1fa7b6a29c61358cc2ca6f64cef4aa0e1a7ca74c (diff)
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>
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