Messages in this thread | | | Date | Sun, 20 Dec 2009 21:04:04 +0000 | From | Al Viro <> | Subject | Re: [PATCH 0/3] vfs: plug some holes involving LAST_BIND symlinks and file bind mounts (try #5) |
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On Sun, Dec 20, 2009 at 08:59:03PM +0100, Pavel Machek wrote: > > WTF not? It's convenient and doesn't lose any real security. If your > > code relies on inaccessibility of <path> since some component of that > > path is inaccessible, you are *already* fscked. Consider e.g. fchdir() > > and its implications - if you have an opened descriptor for parent, > > having no exec permissions on grandparent won't stop you at all. Already. > > On all Unices, regardless of openat(), etc. > > Consider FD passing over unix socket. Passing R/O file descriptor to > the other task, then having the task write to the file is certainly bad.
You've omitted the "R/O file descriptor of a file that is writable for that other task" part...
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