Messages in this thread | | | Date | Mon, 28 Sep 2009 15:10:25 +0100 | From | Jamie Lokier <> | Subject | Re: [PATCH] vfs: new O_NODE open flag |
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Miklos Szeredi wrote: > > Hmm. I have just tried, and you _can _use open("/proc/self/fd/%d", > > O_RDWR) to re-open with more permissions when you can't access the > > path which /proc/self/fd/%d pretends to link to. It looks a bit > > dubious, as you might have been passed an O_RDONLY descriptor with the > > intention that you can't write to it... Oh well! > > True, /proc gives you access to the underlying "path" of an open file > descriptor. If you don't want that, don't mount /proc in your limited > namespace.
I wasn't using a limited namespace.
Just a directory without permission to be searched, and as a regular user - which is historically supposed to prevent you from opening files in it.
-- Jamie
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