Re: Capabilities done right [diff against 2.3.1]
Martin Mares (mj@atrey.karlin.mff.cuni.cz)
Thu, 20 May 1999 12:27:39 +0200
> I just came up with a random thought ---- and I'd need to do more
> investigating about the ELF format to make sure this is actually doable,
> but I believe we can control the order in which constructurs get run,
> yes?
>
> So why not simply put the code which drops the privileges in a
> constructor which is engineered to be run first? If the way that
> constructor is setup uses a stylized code can be easily found by a
> setcap or checkcap program (i.e., give the constructor a standard name,
> and store the capability restriction in a standard variable referenced
> by the constructor), then you can get the ability to query/set the
> capabilities, but it's done in such a way which doesn't require any
> special kernel hacks to enable the feature.
We also might do it in the dynamic linker, which is `the very first
constructor'.
Have a nice fortnight
--
Martin `MJ' Mares <mj@ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
"The number of UNIX installations has grown to 10, with more expected. (6/72)"
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