Date: Tue, 24 May 2022 20:18:02 +0000 From: John Haxby <john.haxby@...cle.com> To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com> Subject: Re: CVE-2022-21499: trivial lockdown break > On 24 May 2022, at 18:10, John Haxby <john.haxby@...cle.com> wrote: > > Hello All, > > CVE-2022-21499: trivial lockdown break > > We recently discovered that it is trivial to break lockdown (and secureboot) using the kernel debugger: you can use the debugger to write zero into a location of your choice ... > > I originally posted this with a preliminary patch on linux-distros. Since then we have developed a better patch that takes into account the differences between integrity and confidentiality modes. > > The updated patch will be available in the Linux mainline kernel at almost the same time as I'm sending this email. I'll reply with the commit ID as soon as I have it. If anyone wants the simpler patch that I posted to linux-bistros, please let me know, but I would encourage you to take the full patch. > > jch The commit that fixes this is eadb2f47a3ce ("lockdown: also lock down previous kgdb use")  jch  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eadb2f47a3ced5c64b23b90fd2a3463f63726066 Download attachment "signature.asc" of type "application/pgp-signature" (269 bytes)
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