Date: Thu, 30 Nov 2023 14:41:45 -0700 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: sahil patidar <sahilpatidar60@gmail.com> Cc: hackers@freebsd.org Subject: Re: kernel control flow integrity (kcfi) Message-ID: <20231130214145.a5hfw4k36yljayoo@mutt-hbsd> In-Reply-To: <CAE-x4DF3_5x1phxqc9e5oTiLs=AHD4ZLJOetsX9yHDAQht39Dg@mail.gmail.com> References: <CAE-x4DF3_5x1phxqc9e5oTiLs=AHD4ZLJOetsX9yHDAQht39Dg@mail.gmail.com>
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[-- Attachment #1 --] On Tue, Jan 10, 2023 at 11:48:43AM +0530, sahil patidar wrote: > hello Hackers, > I want to work on the Freebsd idealist project KCFI (kernel control > flow integrity), I am new in this community and want to be involved in > the Freebsd community and become a contributor. > so I want to know if this project is already done or if someone is > working on it. > if no one working on this project so how can I start work on this project? > I am interested in compiler or kernel dev. Hey Sahil, For the past few years, I've slowly been working on Cross-DSO CFI in HardenedBSD's base userland. I've recently started looking at applying kCFI to the kernel. When compiling/linking kernel modules with -fsanitize=kcfi, ld.lld emits relocation entries that are not supported by the ELF loader in the kernel. Implementing support for the relocation type R_X86_64_REX_GOTPCRELX would be a good first step. I'm a little unsure what needs to happen after implementing support for that relocation type. But, either way, I'm hoping to find out here soon. :-) I'm pretty early on in my research for kCFI integration. I'm curious if you have made progress and if you have any additional insight. Thanks, -- Shawn Webb Cofounder / Security Engineer HardenedBSD https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEA6TL67gupaZ9nzhT/y5nonf44foFAmVpAZMACgkQ/y5nonf4 4frqeg/6AvYv72c0eC9J4G/v+NPpqtHK1H3Equm49m1W2D3LPD+j0kkLLdcmxUG8 eEwecUqHdakZuH49uD3q/L7T45UHveIkOUpYJyCoooRhPlPcxR0Sb42xD2m1sbsf axwrpmwWLE2uUQAqxBTEyl2cqdGhGiipobyVqI0psIQLh66krip8Z+R2DP1g+qaE IV9VaXQvSiY2YPWdXhv/GxZazeKOr/4Mk2tg4VP/9wejW1ctvFIZOYDNoO98qme4 B0w+vm0LT44mjUyzlhAnD2M0iNEKcQY6g1+1Y+a+8uelwCpywtaVoqd1fAdr2Ls+ 12RiETZsGe2mSjaSsMzAIy36WCPM624THw6tYXrp+vY30I37KvTrNjnthFRPpz9v vAwL3qi1N4Jl3kXFejCznEliiBN55rUJoWhfq0B3yJUVeSicjzoE7AqThI3Kn7KX ExO/jpIlRnuBdwd0GvBmmVl5QWxOr75bV63yLESLwG5AbxihSTUfoQS1Ryj1wW// OzsUWyTvyUXEnEu6IgB7niNlF89hgKj6i6Lo0BYm5nAUJYbNqV0a1hVbQF8FX/Ok olYslsaO6GcT5pPDUhT+/cRkWZys5W1EULqW9JV9JZPCNhz7IAz2LZpelcUDlBo3 9J+nkPboLzFiNA2FuNHc78i9izu9Vd+hEFMk0ly3aQ0o/z3jZ9Y= =1eCE -----END PGP SIGNATURE-----
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