lists.openwall.net   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:   Thu, 7 Oct 2021 21:00:33 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Mimi Zohar <zohar@...ux.ibm.com>, Kees Cook <keescook@...omium.org>
Cc:     bauen1 <j2468h@...glemail.com>, akpm@...ux-foundation.org,
        arnd@...db.de, casey@...aufler-ca.com,
        christian.brauner@...ntu.com, christian@...hon.org, corbet@....net,
        cyphar@...har.com, deven.desai@...ux.microsoft.com,
        dvyukov@...gle.com, ebiggers@...nel.org, ericchiang@...gle.com,
        fweimer@...hat.com, geert@...ux-m68k.org, jack@...e.cz,
        jannh@...gle.com, jmorris@...ei.org,
        kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, luto@...nel.org,
        madvenka@...ux.microsoft.com, mjg59@...gle.com,
        mszeredi@...hat.com, mtk.manpages@...il.com,
        nramas@...ux.microsoft.com, philippe.trebuchet@....gouv.fr,
        scottsh@...rosoft.com, sgrubb@...hat.com, shuah@...nel.org,
        steve.dower@...hon.org, thibaut.sautereau@...p-os.org,
        vincent.strubel@....gouv.fr, viro@...iv.linux.org.uk,
        willy@...radead.org
Subject: Re: [PATCH v12 0/3] Add trusted_for(2) (was O_MAYEXEC)


On 07/10/2021 20:37, Mimi Zohar wrote:
> On Thu, 2021-10-07 at 20:29 +0200, Mickaël Salaün wrote:
>> On 07/10/2021 00:03, Kees Cook wrote:
>>> On Fri, Apr 09, 2021 at 07:15:42PM +0200, Mickaël Salaün wrote:
>>>> There was no new reviews, probably because the FS maintainers were busy,
>>>> and I was focused on Landlock (which is now in -next), but I plan to
>>>> send a new patch series for trusted_for(2) soon.
>>>
>>> Hi!
>>>
>>> Did this ever happen? It looks like it's in good shape, and I think it's
>>> a nice building block for userspace to have. Are you able to rebase and
>>> re-send this?
>>
>> I just sent it:
>> https://lore.kernel.org/all/20211007182321.872075-1-mic@digikod.net/
>>
>> Some Signed-off-by would be appreciated. :)
>>
> 
>>>From the cover letter, 
> 
> It is important to note that this can only enable to extend access
> control managed by the kernel.  Hence it enables current access control
> mechanism to be extended and become a superset of what they can
> currently control.  Indeed, the security policy could also be delegated
> to an LSM, either a MAC system or an integrity system.  For instance,
> this is required to close a major IMA measurement/appraisal interpreter
> integrity gap by bringing the ability to check the use of scripts [1].
> Other uses are expected, such as for magic-links [2], SGX integration
> [3], bpffs [4].
> 
>>>From a quick review of the code, I don't see a new security hook being
> defined to cover these use cases.

Indeed, there is no new hook because it would require to implement it
with a current LSM. This first step is a standalone implementation that
is useful as-is but open the way to add a new LSM hook in this new
syscall. That would be a second step for any LSM developer to implement
if interested.

> 
> thanks,
> 
> Mimi
> 
>>>
>>> I've tended to aim these things at akpm if Al gets busy. (And since
>>> you've had past review from Al, that should be hopefully sufficient.)
>>>
>>> Thanks for chasing this!
>>>
>>> -Kees
>>>
> 
> 

Powered by blists - more mailing lists