linux-kernel - Re: [PATCH] pidfd: add ioctl to retrieve pid info

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Message-ID: <CAHC9VhRY81Wp-=jC6-G=6y4e=TSe-dznO=j87i-i+t6GVq4m3w@mail.gmail.com>
Date: Sat, 5 Oct 2024 12:05:57 -0400
From: Paul Moore <paul@...l-moore.com>
To: Luca Boccassi <luca.boccassi@...il.com>
Cc: linux-kernel@...r.kernel.org, christian@...uner.io, 
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH] pidfd: add ioctl to retrieve pid info

On Fri, Oct 4, 2024 at 2:48 PM Luca Boccassi <luca.boccassi@...il.com> wrote:
> On Wed, 2 Oct 2024 at 15:48, Paul Moore <paul@...l-moore.com> wrote:
> > On Wed, Oct 2, 2024 at 10:25 AM <luca.boccassi@...il.com> wrote:

...

> > [NOTE: please CC the LSM list on changes like this]
> >
> > Thanks Luca :)
> >
> > With the addition of the LSM syscalls we've created a lsm_ctx struct
> > (see include/uapi/linux/lsm.h) that properly supports multiple LSMs.
> > The original char ptr "secctx" approach worked back when only a single
> > LSM was supported at any given time, but now that multiple LSMs are
> > supported we need something richer, and it would be good to use this
> > new struct in any new userspace API.
> >
> > See the lsm_get_self_attr(2) syscall for an example (defined in
> > security/lsm_syscalls.c but effectively implemented via
> > security_getselfattr() in security/security.c).
>
> Thanks for the review, makes sense to me - I had a look at those
> examples but unfortunately it is getting a bit beyond my (very low)
> kernel skills, so I've dropped the string-based security_context from
> v2 but without adding something else, is there someone more familiar
> with the LSM world that could help implementing that side?

We are running a little short on devs/time in LSM land right now so I
guess I'm the only real option (not that I have any time, but you know
how it goes).  If you can put together the ioctl side of things I can
likely put together the LSM side fairly quickly - sound good?

-- 
paul-moore.com