From: Coiby Xu <coxu@redhat.com>
To: Mimi Zohar <zohar@linux.ibm.com>
Cc: kexec@lists.infradead.org, Matthew Garrett <mjg59@srcf.ucam.org>,
Jiri Bohac <jbohac@suse.cz>, David Howells <dhowells@redhat.com>,
linux-integrity@vger.kernel.org,
Eric Biederman <ebiederm@xmission.com>,
James Morris <jmorris@namei.org>,
Matthew Garrett <mjg59@google.com>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled
Date: Tue, 22 Nov 2022 10:36:06 +0800 [thread overview]
Message-ID: <20221122023606.nrifkrng5nbfmkka@Rk> (raw)
In-Reply-To: <5d98172d77a8a0f1e3daab44ad51bf38978cc053.camel@linux.ibm.com>
Hi Mimi,
On Mon, Nov 21, 2022 at 01:23:57PM -0500, Mimi Zohar wrote:
>Hi Coiby,
>
>On Mon, 2022-11-21 at 15:29 +0800, Coiby Xu wrote:
>> A kernel builder may not enable KEXEC_SIG and some architectures like
>> ppc64 simply don't have KEXEC_SIG. In these cases, unless both
>> IMA_ARCH_POLICY and secure boot also enabled, lockdown doesn't prevent
>> unsigned kernel image from being kexec'ed via the kexec_file_load
>> syscall whereas it could prevent one via the kexec_load syscall. Mandate
>> signature verification for those cases.
>>
>> Fixes: 155bdd30af17 ("kexec_file: Restrict at runtime if the kernel is locked down")
>> Cc: Matthew Garrett <mjg59@srcf.ucam.org>
>> Cc: Jiri Bohac <jbohac@suse.cz>
>> Cc: David Howells <dhowells@redhat.com>
>> Cc: kexec@lists.infradead.org
>> Cc: linux-integrity@vger.kernel.org
>> Signed-off-by: Coiby Xu <coxu@redhat.com>
>
>Other than correcting the function name to mandate_signature_verificati
>on(),
Applied to v2, thanks for correcting me! Btw, I realize I overwrote the
return code of kexec_image_verify_sig with
mandate_signature_verification's. v2 has fixed this issue as well.
>
>Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
And thanks for the review!
--
Best regards,
Coiby
--
Best regards,
Coiby
next prev parent reply other threads:[~2022-11-22 2:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-21 7:29 [PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled Coiby Xu
2022-11-21 18:23 ` Mimi Zohar
2022-11-22 2:36 ` Coiby Xu [this message]
2022-11-28 17:16 ` Mimi Zohar
2022-12-30 7:00 ` Coiby Xu
2022-11-22 2:28 ` [PATCH v2] " Coiby Xu
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