linux-kernel - Re: [PATCH bpf-next v7 7/8] bpf: lsm: Add selftests for BPF_PROG_TYPE

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Date:   Thu, 26 Mar 2020 20:44:00 +0100
From:   KP Singh <kpsingh@...omium.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, linux-security-module@...r.kernel.org,
        Brendan Jackman <jackmanb@...gle.com>,
        Florent Revest <revest@...gle.com>,
        Thomas Garnier <thgarnie@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        James Morris <jmorris@...ei.org>,
        Kees Cook <keescook@...omium.org>,
        Paul Turner <pjt@...gle.com>, Jann Horn <jannh@...gle.com>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH bpf-next v7 7/8] bpf: lsm: Add selftests for
 BPF_PROG_TYPE_LSM

On 26-Mär 12:24, Andrii Nakryiko wrote:
> On Thu, Mar 26, 2020 at 7:30 AM KP Singh <kpsingh@...omium.org> wrote:
> >
> > From: KP Singh <kpsingh@...gle.com>
> >
> > * Load/attach a BPF program that hooks to file_mprotect (int)
> >   and bprm_committed_creds (void).
> > * Perform an action that triggers the hook.
> > * Verify if the audit event was received using the shared global
> >   variables for the process executed.
> > * Verify if the mprotect returns a -EPERM.
> >
> > Signed-off-by: KP Singh <kpsingh@...gle.com>
> > Reviewed-by: Brendan Jackman <jackmanb@...gle.com>
> > Reviewed-by: Florent Revest <revest@...gle.com>
> > Reviewed-by: Thomas Garnier <thgarnie@...gle.com>
> > ---
> 
> Please fix endlines below. With that:
> 
> Acked-by: Andrii Nakryiko <andriin@...com>
> 
> >  tools/testing/selftests/bpf/config            |  2 +
> >  .../selftests/bpf/prog_tests/test_lsm.c       | 86 +++++++++++++++++++
> >  tools/testing/selftests/bpf/progs/lsm.c       | 48 +++++++++++
> >  3 files changed, 136 insertions(+)
> >  create mode 100644 tools/testing/selftests/bpf/prog_tests/test_lsm.c
> >  create mode 100644 tools/testing/selftests/bpf/progs/lsm.c
> >
> 
> [...]
> 
> > +void test_test_lsm(void)
> > +{
> > +       struct lsm *skel = NULL;
> > +       int err, duration = 0;
> > +
> > +       skel = lsm__open_and_load();
> > +       if (CHECK(!skel, "skel_load", "lsm skeleton failed\n"))
> > +               goto close_prog;
> > +
> > +       err = lsm__attach(skel);
> > +       if (CHECK(err, "attach", "lsm attach failed: %d\n", err))
> > +               goto close_prog;
> > +
> > +       err = exec_cmd(&skel->bss->monitored_pid);
> > +       if (CHECK(err < 0, "exec_cmd", "err %d errno %d\n", err, errno))
> > +               goto close_prog;
> > +
> > +       CHECK(skel->bss->bprm_count != 1, "bprm_count", "bprm_count = %d",
> 
> \n is missing

Done.

> 
> > +             skel->bss->bprm_count);
> > +
> > +       skel->bss->monitored_pid = getpid();
> > +
> > +       err = heap_mprotect();
> > +       if (CHECK(errno != EPERM, "heap_mprotect", "want errno=EPERM, got %d\n",
> > +                 errno))
> > +               goto close_prog;
> > +
> > +       CHECK(skel->bss->mprotect_count != 1, "mprotect_count",
> > +             "mprotect_count = %d", skel->bss->mprotect_count);
> 
> \n is missing

Done.

- KP

> 
> > +
> > +close_prog:
> > +       lsm__destroy(skel);
> > +}
> 
> [...]