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Biederman) To: David Howells Cc: Andy Lutomirski , Jann Horn , Linus Torvalds , Matthew Garrett , Ard Biesheuvel , James Morris , Alan Cox , Greg Kroah-Hartman , Linux Kernel Mailing List , Justin Forbes , linux-man , joeyli , LSM List , Linux API , Kees Cook , linux-efi References: <30459.1522739219@warthog.procyon.org.uk> <9758.1522775763@warthog.procyon.org.uk> <13189.1522784944@warthog.procyon.org.uk> <9349.1522794769@warthog.procyon.org.uk> <20736.1522829117@warthog.procyon.org.uk> Date: Wed, 04 Apr 2018 10:43:57 -0500 In-Reply-To: <20736.1522829117@warthog.procyon.org.uk> (David Howells's message of "Wed, 04 Apr 2018 09:05:17 +0100") Message-ID: <87fu4bj7sy.fsf@xmission.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1f3kav-0007rS-Pt;;;mid=<87fu4bj7sy.fsf@xmission.com>;;;hst=in02.mta.xmission.com;;;ip=67.3.145.25;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1+Ck+qhCKGvXg7Sf9Tw5GDCuSznbdYMMI4= X-SA-Exim-Connect-IP: 67.3.145.25 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Remote-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on sa01.xmission.com X-Remote-Spam-Level: ** X-Remote-Spam-Status: No, score=2.1 required=8.0 tests=ALL_TRUSTED,BAYES_50, DCC_CHECK_NEGATIVE,TVD_RCVD_IP,T_TM2_M_HEADER_IN_MSG,XMSubMetaSxObfu_03, XMSubMetaSx_00 autolearn=disabled version=3.4.0 X-Remote-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.0 TVD_RCVD_IP Message was received from an IP address * 0.0 T_TM2_M_HEADER_IN_MSG BODY: No description available. * 0.8 BAYES_50 BODY: Bayes spam probability is 40 to 60% * [score: 0.5000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa01 1397; Body=1 Fuz1=1 Fuz2=1] * 1.2 XMSubMetaSxObfu_03 Obfuscated Sexy Noun-People * 1.0 XMSubMetaSx_00 1+ Sexy Words X-Remote-Spam-DCC: XMission; sa01 1397; Body=1 Fuz1=1 Fuz2=1 X-Remote-Spam-Combo: **;David Howells X-Remote-Spam-Relay-Country: X-Remote-Spam-Timing: total 476 ms - load_scoreonly_sql: 0.06 (0.0%), signal_user_changed: 3.3 (0.7%), b_tie_ro: 2.3 (0.5%), parse: 1.38 (0.3%), extract_message_metadata: 4.6 (1.0%), get_uri_detail_list: 1.95 (0.4%), tests_pri_-1000: 8 (1.7%), tests_pri_-950: 2.2 (0.5%), tests_pri_-900: 1.72 (0.4%), tests_pri_-400: 35 (7.3%), check_bayes: 33 (6.9%), b_tokenize: 14 (2.9%), b_tok_get_all: 8 (1.8%), b_comp_prob: 4.5 (1.0%), b_tok_touch_all: 2.9 (0.6%), b_finish: 0.82 (0.2%), tests_pri_0: 392 (82.2%), check_dkim_signature: 0.88 (0.2%), check_dkim_adsp: 4.4 (0.9%), tests_pri_500: 7 (1.4%), rewrite_mail: 0.00 (0.0%) Subject: Re: [GIT PULL] Kernel lockdown for secure boot X-Remote-Spam-Flag: No X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: David Howells writes: > Andy Lutomirski wrote: > >> As far as I can tell, what's really going on here is that there's a >> significant contingent here that wants to prevent Linux from >> chainloading something that isn't Linux. > > You have completely the wrong end of the stick. No one has said that or even > implied that. You are alleging dishonesty on our part. > > What we *have* said is that *if* we want to pass the secure boot state across > kexec, then we have to make sure that: > > (1) no one tampers with the intermediate kernel between boot and kexec > otherwise the secure boot state is effectively invalidated, and > > (2) the image that gets kexec'ed is trusted. > > Remember: you cannot know (2) if you don't have (1). > > And if someone tampers with the aim of breaking, say, Windows, then someone, > e.g. Microsoft, might blacklist the shim. *Wow* You just denied this isn't about not booting Windows and a few lines later said that is your concern. I was thinking I would have to dig up old archives where I had been told this before, but you just nicely repeated all of the old arguments so I don't see the point. Eric