Has anyone tried running grsec with xen (2.4) ?
Are there any expected problems, or should it be ok "out-of-the-box"?
I have not yet tried patching xen-patched kernel with grsec.. Just wanted to
ask if somebody has already tried this.
-- Pasi Kärkkäinen
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Pasi Kärkkäinen wrote:> Has anyone tried running grsec with xen (2.4) ? > > Are there any expected problems, or should it be ok "out-of-the-box"? > I have not yet tried patching xen-patched kernel with grsec.. Just wanted to > ask if somebody has already tried this.I am fairly sure you will run into infinite page-fault loops if you are trying to use the PaX ''software NX'' implementation, because the call to Xen to update the page tables will frequently exhaust the associativity of the data-TLB. You could find a way of implementing this part inside Xen though, by using an AVL or reserved bit to signify ''no execute'', but this may be too much hassle. The rest of grsec looks (from the description on the website) like it can be applied without problems. Jacob ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 23 Nov 2004 11:42:46 +0100 Jacob Gorm Hansen <jacobg@diku.dk> wrote:> Pasi Kärkkäinen wrote: > > Has anyone tried running grsec with xen (2.4) ? > > > > Are there any expected problems, or should it be ok "out-of-the-box"? > > I have not yet tried patching xen-patched kernel with grsec.. Just wanted to > > ask if somebody has already tried this. > > I am fairly sure you will run into infinite page-fault loops if you are > trying to use the PaX ''software NX'' implementation, [...]What about hardware implementations? IIRC, the Athlon64 processors (amongst others) implement such feature in hardware? While I know that there''s usable version of Xen for AMD64 so far, can this feature also be used in 32-Bit-mode? (On the other hand, I''m not aware whether PaX will use this feature or not...) ...just jumping in because I''m interested in this too... Regards, Milan - -- Milan Holzäpfel alias jagdfalke alias jag Antworten direkt an mich Answers directly to me gehen bitte an eine Addresse, go to an address one die man hier finden kann: can find here, please: Kontaktinfos sowie Contact infos as well as Öff GnuPG-Schlüssel <URL:http://con.mjh.name/> GnuPG Public Key GnuPG Fingerabdruck 4C8A 5FAF 5D32 6125 89D1 GnuPG Fingerprint 0CE5 DB0C AF4F 6583 7966 http://www.deppenleerzeichen.de/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFBo47Y2wyvT2WDeWYRAi3NAKDG+cjJZHY0RcRT46O4pNMA0h0rOwCgqnUK a+BIZn7JTL/Nx6ExQI9XPBk=86hT -----END PGP SIGNATURE----- ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Milan Holzäpfel wrote:> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1> What about hardware implementations? IIRC, the Athlon64 processors > (amongst others) implement such feature in hardware? While I know that > there''s usable version of Xen for AMD64 so far, can this feature also be > used in 32-Bit-mode? (On the other hand, I''m not aware whether PaX will > use this feature or not...) > ...just jumping in because I''m interested in this too...I suppose that would just work, though I think it requires PAE mode (64 bit page table entries), does Xen support PAE now, I guess it does? There was another similar patch from Redhat using segments instead of playing with the TLB, that will probably work with few or no modifications. Jacob ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel