lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Fri, 03 May 2019 10:24:49 -0400
From:   Mimi Zohar <>
To:     Tetsuo Handa <>,
        Casey Schaufler <>,
        prakhar srivastava <>
        linux-security-module <>,
        Paul Moore <>,
        John Johansen <>
Subject: Re: [PATCH] kexec_buffer measure

On Fri, 2019-05-03 at 09:53 +0900, Tetsuo Handa wrote:
> On 2019/05/03 1:28, Casey Schaufler wrote:
> > On 5/2/2019 8:48 AM, Mimi Zohar wrote:
> >> [Cc'ing Paul, John, Casey]
> >>
> >> On Mon, 2019-04-22 at 20:18 -0400, Mimi Zohar wrote:
> >>> [Cc'ing LSM mailing list]
> >>>
> >>> On Fri, 2019-04-19 at 17:30 -0700, prakhar srivastava wrote:
> >>>
> >>>> 2) Adding a LSM hook
> >>>> We are doing both the command line and kernel version measurement in IMA.
> >>>> Can you please elaborate on how this can be used outside of the scenario?
> >>>> That will help me come back with a better design and code. I am
> >>>> neutral about this.
> >>> As I said previously, initially you might want to only measure the
> >>> kexec boot command line, but will you ever want to verify or audit log
> >>> the boot command line hash? Perhaps LSMs would be interested in the
> >>> boot command line. Should this be an LSM hook?
> >>   From an LSM perspective, is there any interest in the boot command line?
> > 
> > I can imagine an LSM that cares about the command line,
> > but I don't have interest in it for any work I have in progress.
> > 
> Since the kernel command line controls which LSMs to enable, I doubt that
> an LSM which cares about the command line can detect that the kernel command
> line was tampered when the kernel command line was tampered...

As the subject line indicates, this is the kexec boot command line.

This wouldn't be any different than the existing
kernel_read_file_from_fd() and security_kernel_load_data() calls in
kernel/kexec_file.c and  kernel/kexec.c, which provides the LSMs an
opportunity to comment on the kexec image and initramfs.


Powered by blists - more mailing lists