Re: [PATCH v17 01/15] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privs

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

On Thu, 29 Mar 2012 15:01:46 -0500
Will Drewry <wad@xxxxxxxxxxxx> wrote:

> From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
> 
> With this set, a lot of dangerous operations (chroot, unshare, etc)
> become a lot less dangerous because there is no possibility of
> subverting privileged binaries.

The changelog doesn't explain the semantics of the new syscall. 
There's a comment way-down-there which I guess suffices, if you hunt
for it.

And the changelog doesn't explain why this is being added.  Presumably
seccomp_filter wants/needs this feature but whowhatwherewhenwhy?  Spell
it all out, please.

The new syscall mode will be documented in the prctl manpage.  Please
cc linux-man@xxxxxxxxxxxxxxx and work with Michael on getting this
done?

>
> ...
>
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