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Date:	Mon, 26 Oct 2009 14:22:16 -0400
From:	Trond Myklebust <>
To:	Pavel Machek <>
Cc:	Jan Kara <>, "J. Bruce Fields" <>,
	"Serge E. Hallyn" <>,
	kernel list <>,,,
Subject: Re: symlinks with permissions

On Sun, 2009-10-25 at 10:36 +0100, Pavel Machek wrote:
> Well, it is unexpected and mild security hole.
> Part of the problem is that even  if you have read-only
> filedescriptor, you can upgrade it to read-write, even if path is
> inaccessible to you.
> So if someone passes you read-only filedescriptor, you can still write
> to it.
> 									Pavel

If someone passes you a file descriptor, can't you in any case play
games with, openat(fd,"",O_RDWR), in order to achieve the same thing? I
must admit I haven't tried it yet, but at a first glance I can't see
anything that prevents me from doing this...


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