linux-kernel - Re: [PATCH bpf] security: Fix hook iteration for secid_to

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Date:   Wed, 20 May 2020 20:12:46 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     James Morris <jmorris@...ei.org>
Cc:     Casey Schaufler <casey@...aufler-ca.com>,
        KP Singh <kpsingh@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: [PATCH bpf] security: Fix hook iteration for secid_to_secctx

On Wed, May 20, 2020 at 7:02 PM James Morris <jmorris@...ei.org> wrote:
>
> On Wed, 20 May 2020, Alexei Starovoitov wrote:
>
> > On Wed, May 20, 2020 at 8:15 AM Casey Schaufler <casey@...aufler-ca.com> wrote:
> > >
> > >
> > > On 5/20/2020 5:56 AM, KP Singh wrote:
> > > > From: KP Singh <kpsingh@...gle.com>
> > > >
> > > > secid_to_secctx is not stackable, and since the BPF LSM registers this
> > > > hook by default, the call_int_hook logic is not suitable which
> > > > "bails-on-fail" and casues issues when other LSMs register this hook and
> > > > eventually breaks Audit.
> > > >
> > > > In order to fix this, directly iterate over the security hooks instead
> > > > of using call_int_hook as suggested in:
> > > >
> > > > https: //lore.kernel.org/bpf/9d0eb6c6-803a-ff3a-5603-9ad6d9edfc00@...aufler-ca.com/#t
> > > >
> > > > Fixes: 98e828a0650f ("security: Refactor declaration of LSM hooks")
> > > > Fixes: 625236ba3832 ("security: Fix the default value of secid_to_secctx hook"
> > > > Reported-by: Alexei Starovoitov <ast@...nel.org>
> > > > Signed-off-by: KP Singh <kpsingh@...gle.com>
> > >
> > > This looks fine.
> >
> > Tested. audit works now.
> > I fixed missing ')' in the commit log
> > and applied to bpf tree.
> > It will be on the way to Linus tree soon.
>
> Please add:
>
>
> Acked-by: James Morris <jamorris@...ux.microsoft.com>

Thank you. Done.