From: Ondrej Mosnacek <omosnace@redhat.com>
To: Paul Moore <paul@paul-moore.com>
Cc: Scott Mayhew <smayhew@redhat.com>,
SElinux list <selinux@vger.kernel.org>,
linux-nfs <linux-nfs@vger.kernel.org>,
Linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFC v2 1/2] selinux: Fix selinux_sb_mnt_opts_compat()
Date: Tue, 1 Feb 2022 15:38:16 +0100 [thread overview]
Message-ID: <CAFqZXNs7P+p0B-uZ2owMH1qa04unbq870tMqQ4Kwup7dXJ9z=g@mail.gmail.com> (raw)
In-Reply-To: <CAHC9VhQE4JPhTjkKwV3ovRSuPceiHDrP3MDW4RPDcNtLkb7tAQ@mail.gmail.com>
On Mon, Jan 31, 2022 at 5:16 PM Paul Moore <paul@paul-moore.com> wrote:
> On Mon, Jan 31, 2022 at 7:46 AM Ondrej Mosnacek <omosnace@redhat.com> wrote:
> > On Fri, Jan 28, 2022 at 3:28 AM Paul Moore <paul@paul-moore.com> wrote:
> > > On Thu, Jan 27, 2022 at 4:54 AM Ondrej Mosnacek <omosnace@redhat.com> wrote:
> > > > I wonder if we could make this all much simpler by *always* doing the
> > > > label parsing in selinux_add_opt() and just returning an error when
> > > > !selinux_initialized(&selinux_state). Before the new mount API, mount
> > > > options were always passed directly to the mount(2) syscall, so it
> > > > wasn't possible to pass any SELinux mount options before the SELinux
> > > > policy was loaded. I don't see why we need to jump through hoops here
> > > > just to support this pseudo-feature of stashing an unparsed label into
> > > > an fs_context before policy is loaded... Userspace should never need
> > > > to do that.
> > >
> > > I could agree with that, although part of my mind is a little nervous
> > > about the "userspace should *never* ..." because that always seems to
> > > bite us. Although I'm struggling to think of a case where userspace
> > > would need to set explicit SELinux mount options without having a
> > > policy loaded.
> >
> > I get that, but IMO this is enough of an odd "use case" that I
> > wouldn't worry too much ...
>
> I understand, but seeing as I'm the only one that defends these things
> with Linus and others lets do this:
It's not all black and white:
https://lore.kernel.org/lkml/Pine.LNX.4.64.0512291322560.3298@g5.osdl.org/
> 1. Fix what we have now using Scott's patches once he incorporates the feedback.
> 2. Merge another patch (separate patch(set) please!) which does the
> parsing in selinux_add_opt().
>
> ... this was if we have to revert #2 we still have the fixes in #1.
Sounds good to me. I can prepare the simplification patch. If anyone
does come to complain, then by all means, let's revert it.
--
Ondrej Mosnacek
Software Engineer, Linux Security - SELinux kernel
Red Hat, Inc.
next prev parent reply other threads:[~2022-02-01 14:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-20 21:49 [PATCH RFC v2 0/2] selinux: parse sids earlier to avoid doing memory allocations under spinlock Scott Mayhew
2022-01-20 21:49 ` [PATCH RFC v2 1/2] selinux: Fix selinux_sb_mnt_opts_compat() Scott Mayhew
2022-01-24 21:27 ` Paul Moore
2022-01-25 17:30 ` Scott Mayhew
2022-01-25 17:45 ` Paul Moore
2022-01-25 18:51 ` Scott Mayhew
2022-01-25 22:32 ` Paul Moore
2022-01-26 20:41 ` Scott Mayhew
2022-01-28 1:53 ` Paul Moore
2022-01-27 9:54 ` Ondrej Mosnacek
2022-01-28 2:25 ` Paul Moore
2022-01-31 12:46 ` Ondrej Mosnacek
2022-01-31 16:16 ` Paul Moore
2022-02-01 14:38 ` Ondrej Mosnacek [this message]
2022-02-01 16:19 ` Paul Moore
2022-01-20 21:49 ` [PATCH RFC v2 2/2] selinux: try to use preparsed sid before calling parse_sid() Scott Mayhew
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