linux-kernel - Re: [RFC PATCH v5 0/1] Add dm verity root hash pkcs7 sig validation.

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Date:   Fri, 28 Jun 2019 16:27:28 -0700 (PDT)
From:   Jaskaran Singh Khurana <jaskarankhurana@...ux.microsoft.com>
To:     Eric Biggers <ebiggers@...nel.org>
cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, agk@...hat.com, snitzer@...hat.com,
        dm-devel@...hat.com, jmorris@...ei.org, scottsh@...rosoft.com,
        mpatocka@...hat.com, gmazyland@...il.com
Subject: Re: [RFC PATCH v5 0/1] Add dm verity root hash pkcs7 sig
 validation.


Hello Eric,

On Fri, 28 Jun 2019, Eric Biggers wrote:

>> In a datacenter like environment, this will protect the system from below
>> attacks:
>>
>> 1.Prevents attacker from deploying scripts that run arbitrary executables on the system.
>> 2.Prevents physically present malicious admin to run arbitrary code on the
>>   machine.
>>
>> Regards,
>> Jaskaran
>
> So you are trying to protect against people who already have a root shell?
>
> Can't they just e.g. run /usr/bin/python and type in some Python code?
>
> Or run /usr/bin/curl and upload all your secret data to their server.
>
> - Eric
>

You are correct, it would not be feasible for a general purpose distro, 
but for embedded systems and other cases where there is a more tightly 
locked-down system.

Regards,
Jaskaran.