linux-kernel - Re: [PATCH v3 0/2] let kexec_file_load use platform keyring to verify the kernel image

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Date:   Fri, 18 Jan 2019 10:16:04 +0800
From:   Kairui Song <kasong@...hat.com>
To:     Dave Young <dyoung@...hat.com>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>, linux-kernel@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        jwboyer@...oraproject.org, keyrings@...r.kernel.org,
        jmorris@...ei.org, serge@...lyn.com, bauerman@...ux.ibm.com,
        Eric Biggers <ebiggers@...gle.com>, nayna@...ux.ibm.com,
        linux-integrity <linux-integrity@...r.kernel.org>,
        kexec@...ts.infradead.org
Subject: Re: [PATCH v3 0/2] let kexec_file_load use platform keyring to verify
 the kernel image

On Fri, Jan 18, 2019 at 10:00 AM Dave Young <dyoung@...hat.com> wrote:
>
> On 01/18/19 at 09:35am, Dave Young wrote:
> > On 01/17/19 at 08:08pm, Mimi Zohar wrote:
> > > On Wed, 2019-01-16 at 18:16 +0800, Kairui Song wrote:
> > > > This patch series adds a .platform_trusted_keys in system_keyring as the
> > > > reference to .platform keyring in integrity subsystem, when platform
> > > > keyring is being initialized it will be updated. So other component could
> > > > use this keyring as well.
> > >
> > > Remove "other component could use ...".
> > > >
> > > > This patch series also let kexec_file_load use platform keyring as fall
> > > > back if it failed to verify the image against secondary keyring, make it
> > > > possible to load kernel signed by third part key if third party key is
> > > > imported in the firmware.
> > >
> > > This is the only reason for these patches.  Please remove "also".
> > >
> > > >
> > > > After this patch kexec_file_load will be able to verify a signed PE
> > > > bzImage using keys in platform keyring.
> > > >
> > > > Tested in a VM with locally signed kernel with pesign and imported the
> > > > cert to EFI's MokList variable.
> > >
> > > It's taken so long for me to review/test this patch set due to a
> > > regression in sanity_check_segment_list(), introduced somewhere
> > > between 4.20 and 5.0.0-rc1.  The sgement overlap test - "if ((mend >
> > > pstart) && (mstart < pend))" - fails, returning a -EINVAL.
> > >
> > > Is anyone else seeing this?
> >
> > Mimi, should be this issue?  I have sent a fix for that.
> > https://lore.kernel.org/lkml/20181228011247.GA9999@dhcp-128-65.nay.redhat.com/
>
> Hi, Kairui, I think you should know this while working on this series,
> It is good to mention the test dependency in cover letter so that reviewers
> can save time.
>
> BTW, Boris took it in tip already:
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=993a110319a4a60aadbd02f6defdebe048f7773b
>

Hi, thanks for the suggestion, I did apply your patch to avoid the
failure. Will add such info next time.

Will send out V4 and update commit message as suggested by Mimi


--
Best Regards,
Kairui Song