[PATCH bpf] security: Fix hook iteration for secid_to_secctx

[Alexei Starovoitov]

On Wed, May 20, 2020 at 7:02 PM James Morris <jmorris at namei.org> wrote:
>
> On Wed, 20 May 2020, Alexei Starovoitov wrote:
>
> > On Wed, May 20, 2020 at 8:15 AM Casey Schaufler <casey at schaufler-ca.com> wrote:
> > >
> > >
> > > On 5/20/2020 5:56 AM, KP Singh wrote:
> > > > From: KP Singh <kpsingh at google.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 at schaufler-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 at kernel.org>
> > > > Signed-off-by: KP Singh <kpsingh at google.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 at linux.microsoft.com>

Thank you. Done.