Messages in this thread | | | Date | Sun, 3 Aug 2003 21:18:33 +0200 | From | bert hubert <> | Subject | Re: [PATCH] Allow /dev/{,k}mem to be disabled to prevent kernel from being modified easily |
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On Sun, Aug 03, 2003 at 09:11:02PM +0200, Willy Tarreau wrote:
> Why not make this change dynamic instead ? eg : your system boots unlocked, > and definitely locks /dev/{,k}mem once you do something such as > > echo foo > /proc/path_to_magic_entry
I thought about something like that but then for loading modules too - which would allow for a modular boot but a lock afterwards.
> So the same config can be used with kernel with and without X, it's just a > matter of runtime configuration. It could even be a sysctl, as long as there's > no way to unset it.
Well, I fear the runtime overhead - as it is, I suspect this patch is somewhat inflamatory anyhow ('tough luck you were hacked', 'you are fscked anyhow').
However, the check would be in {,k}mem_open and in sys_init_module, which are not heavily used functions.
I'll whip up a dynamic patch soonish - I'm unsure about the right location, /proc/sys/ something?
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