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Message-ID: <727e50150612281352m524cc325gc8695b9c5087aade@mail.gmail.com>
Date: Thu, 28 Dec 2006 16:52:24 -0500
From: "Aaron Cohen" <aaron@...onance.org>
To: "LKML List" <linux-kernel@...r.kernel.org>
Subject: CAP_LINUX_IMMUTABLE question
CAP_LINUX_IMMUTABLE currently makes it impossible both to chattr +i or
chattr -i.
I think it would be convenient if there was someone to make it only
illegal for chattr -i. So that I could still make files unchangeable,
while not allowing myself to ever make them changeable again without
the capability.
I'm currently using CAP_LINUX_IMMUTABLE (along with CAP_SYS_RAWIO and
CAP_SYS_MODULE) to make a poor-man's readonly bootable USB key for USB
drives that don't have a physical R/W switch. (The priviledges are
dropped in my initscripts).
The only problem is that such a USB key isn't able to make a copy of
itself because it can't remove the mutability of files which is a
little inconvenient. :)
I doubt it would be possible to change the semantics for
CAP_LINUX_IMMUTABLE but would it be stupid of me to try to add a
CAP_LINUX_MUTABLE flag that does what I want?
Thanks,
Aaron
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