Re: [f-cpu] tlb last ! (secure bit, lib ring)

[whygee@club-internet.fr]

nicO = The Lord of the Ring(s) ? :-)

this thread is looking (at least to me, i don't
speak for other lurkers) like it's going in endless
circles.

Sure, F-CPU was not designed for security in the
beginning, and it's probably the right time to address
this issue. But remember that it must remain simple,
and what is simple for you might be out of reach
for many people.

i'll adopt a "middle" behaviour : TLB format can
be user-defined until F-CPU v1 is frozen. Though my
new job at http://www.artabel.net/ might slow the process.

All i want it something that works (and i'm not alone).
I don't need a Hurd-like project.

/me ---> /home/bed.

----Message d'origine----
>Sujet: [f-cpu] tlb last ! (secure bit, lib ring)
>De: "Nicolas Boulay" <nicolas.boulay@ifrance.com>
>
>I forgot to add for the tlb, the tagged region.
>- So one more bit in the tlb ("secure bit").
>- split the load&store in normal and secure one (to access the secure
>area).
>
>Maybe we could have one user secure bit and one superuser secure bit.
>
>[That's mainly to definitely protect the return stack from buffer
>overflow. return stack are on a secure area, and buffer are only managed
>by normal load&store. Only fonction pointer are now a problem : this
>could be solve with the use of a new ring to protect excve ? (that's
>means that to access excve a kind of trap must occur which is a very
>different thing compare to a typical function call)]
>
>[Maybe rwx right for this new (lib ?) ring could be added, too.]
>
>nicO
>
>
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