Date: Mon, 2 Apr 2012 15:23:36 -0400 From: Richard Yao <ryao@cs.stonybrook.edu> To: Peter Wemm <peter@wemm.org> Cc: Tom Evans <tevans.uk@googlemail.com>, freebsd-stable@freebsd.org Subject: Re: Text relocations in kernel modules Message-ID: <4F79FCB8.1090003@cs.stonybrook.edu> In-Reply-To: <CAGE5yCrwLosuTT2yq0DEx%2Bz8ztKpkrB=tORmURcuh_SCz=L7qg@mail.gmail.com> References: <4F75E404.8000104@cs.stonybrook.edu> <4F75EF86.6090909@cs.stonybrook.edu> <20120330190713.GG2358@deviant.kiev.zoral.com.ua> <4F760C9E.6060405@cs.stonybrook.edu> <20120330194649.GH2358@deviant.kiev.zoral.com.ua> <4F761371.7020606@cs.stonybrook.edu> <20120330203605.GI2358@deviant.kiev.zoral.com.ua> <4F76350F.8000708@cs.stonybrook.edu> <20120330224631.GJ2358@deviant.kiev.zoral.com.ua> <4F7637F3.2060502@cs.stonybrook.edu> <CAGE5yCpuvsVrc-%2BDTVas-W4fjuP2s%2B6PQONMOTyEbGnj2CY3ig@mail.gmail.com> <4F766F29.2030803@cs.stonybrook.edu> <CAFHbX1KiZx68MP4bCAvPc0Zui3fA4O35_z3kP781zoJqLYp7Bw@mail.gmail.com> <4F79D88B.3040102@cs.stonybrook.edu> <CAFHbX1KE15G9gx7Duw2R8zC5jL1jiEir0yMB0-s5%2B4xx517WtQ@mail.gmail.com> <4F79E27E.3000509@cs.stonybrook.edu> <CAGE5yCrwLosuTT2yq0DEx%2Bz8ztKpkrB=tORmURcuh_SCz=L7qg@mail.gmail.com>
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--------------enigD2B11ADE89A5E704533C71CB Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 04/02/12 14:46, Peter Wemm wrote: > Remember.. ASLR is a userland thing. .ko files, which is what this > thread is about, already use random address layout. When you do a > "kldload virtio.ko", you have no way to predict what address it will > be loaded at. And you don't even have access to the addresses. >=20 > Of course if you want to talk about ASLR and userland .so files then > that's an entirely different thing. But this thread is about your > tools finding DT_TEXTREL in a .ko kernel file, not userland .so files. >=20 The PaX project's patches to the Linux kernel include kernel stack randomization. The Gentoo Hardened project makes use of this in their fork of the Linux kernel. --------------enigD2B11ADE89A5E704533C71CB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJPefy7AAoJELFAT5FmjZuEDkgQANVP4ETuoTEjHxSKiubdH7JD KnAQvdvEULuwJFhQNsAfEF3ls6mjMRIRDyXEQrIupzEjldMgIXCGd9gnjsT0X+PW mf60bgnc0VlIkoyYBUTeBCLZ4TWC03lSVVWohzqkiGWDCtzqONpR0G5dgcxOrRTZ 0a4IOu8AO6SxVUjne/a+zW/XKxktyXSpo2k9zdJqQX9tx5rdaCuZ6ZlzUI+VL11C Q2negh6n2pdLU0xy15xy3VRdG/figb5vAtG/WfFhHP7UYql4xnQbDIkEFEY/e8XE TyVXJ2Yy0eGCtFQcNpUGNMoNAtqDNXRXUEAVbNd9lqTmVlb6PSx5hnLWbFGVmCha 514relB4CrN5Nq4K0ATF9BkvwBQROH0cvWfOikNGCAwi8MegMaoWNH4atQV8i1xl F1xjndrlVDlGagqw7HUG8sXPIi9ZUsOAjhchA6bnctUAjgok3qk3A34+8v0xZqa4 3sdLngLk1z661YDaKmF6WUbuxbLBRElQUb/ZYeiYyX4EHja1Ya6Mmfe2EdXbRdTv CkHJZduQuEmBCAbqOi14FsL7UAEnCr1WcxDXkhfhYfL6BR6o2IuhS771i9xRo9oA E+exWU3/H5Tgl0ABNZcy/js7qARy22uELcnZujeyuI8MMJUHFCHfuSwvCk/+6YGX 6cPm06lSLrNde9fVKbCQ =LdKQ -----END PGP SIGNATURE----- --------------enigD2B11ADE89A5E704533C71CB--
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