On Thu, Apr 10, 2014 at 12:14:27PM -0700, Andy Lutomirski wrote: > > This is the second time in a week that someone has asked for a way to > have a struct file (or struct inode or whatever) that can't be reopened > through /proc/pid/fd. This should be quite easy to implement as a > separate feature. What I suggested on a different thread was to add the following new file descriptor flags, to join FD_CLOEXEC, which would be maniuplated using the F_GETFD and F_SETFD fcntl commands: FD_NOPROCFS disallow being able to open the inode via /proc/<pid>/fd FD_NOPASSFD disallow being able to pass the fd via a unix domain socket FD_LOCKFLAGS if this bit is set, disallow any further changes of FD_CLOEXEC, FD_NOPROCFS, FD_NOPASSFD, and FD_LOCKFLAGS flags. Regardless of what else we might need to meet the use case for the proposed File Sealing API, I think this is a useful feature that could be used in many other contexts besides just the proposed memfd_create() use case. Cheers, - Ted -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>