linux-kernel - Re: [PATCH V8 3/3] Call ima_kexec_cmdline to measure the cmdline args

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Date:   Thu, 13 Jun 2019 16:07:36 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Dave Young <dyoung@...hat.com>
Cc:     Prakhar Srivastava <prsriva02@...il.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, roberto.sassu@...wei.com,
        "Eric W. Biederman" <ebiederm@...ssion.com>, vgoyal@...hat.com,
        kexec <kexec@...ts.infradead.org>
Subject: Re: [PATCH V8 3/3] Call ima_kexec_cmdline to measure the cmdline
 args

On Thu, 2019-06-13 at 16:26 +0800, Dave Young wrote:
> On 06/12/19 at 06:31pm, Mimi Zohar wrote:
> > [Cc: kexec mailing list]
> > 
> > Hi Eric, Dave,
> > 
> > On Wed, 2019-06-12 at 15:15 -0700, Prakhar Srivastava wrote:
> > > During soft reboot(kexec_file_load) boot cmdline args
> > > are not measured.Thus the new kernel on load boots with
> > > an assumption of cold reboot.
> > > 
> > > This patch makes a call to the ima hook ima_kexec_cmdline,
> > > added in "Define a new IMA hook to measure the boot command
> > > line arguments"
> > > to measure the boot cmdline args into the ima log.
> > > 
> > > - call ima_kexec_cmdline from kexec_file_load.
> > > - move the call ima_add_kexec_buffer after the cmdline
> > > args have been measured.
> > > 
> > > Signed-off-by: Prakhar Srivastava <prsriva02@...il.com>
> > Cc: Eric W. Biederman <ebiederm@...ssion.com>
> > Cc: Dave Young <dyoung@...hat.com>
> > 
> > Any chance we could get some Acks?
> 
> The ima_* is blackbox functions to me, looks like this patch is trying
> to measure kexec cmdline buffer and save in some ima logs and then add all the
> measure results including those for kernel/initrd to a kexec_buf and pass to 2nd

Right, including the new boot command line measurement.

> kernel.
> 
> It should be good and only take effect when IMA enabled. If all the
> assumptions are right:
> 
> Acked-by: Dave Young <dyoung@...hat.com>

Thanks, Dave.