Re: [PATCH 0/3] Taming execve, setuid, and LSMs

[Andrew Lutomirski]

On Tue, Apr 20, 2010 at 10:35 AM, Serge E. Hallyn <serue@xxxxxxxxxx> wrote:
>>
>> True,  but I think it's still asking for trouble -- other LSMs could
>> (and almost certainly will, especially the out-of-tree ones) do
>> something, and I think that any action at all that an LSM takes in the
>> bprm_set_creds hook for a nosuid (or whatever it's called) process is
>> wrong or at best misguided.
>
> I could be wrong, but I think the point is that your reasoning is
> correct, and that the same reasoning must apply if we're just
> executing a file out of an fs which has been mounted with '-o nosuid'.

I tend to agree, except that only root can set nosuid (presumably) and
making that change will change existing behavior.  Is that a problem?

--Andy
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