From: Kees Cook <keescook@chromium.org>
To: KP Singh <kpsingh@chromium.org>
Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
linux-security-module@vger.kernel.org,
Brendan Jackman <jackmanb@google.com>,
Florent Revest <revest@google.com>, Yonghong Song <yhs@fb.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
James Morris <jmorris@namei.org>, Paul Turner <pjt@google.com>,
Jann Horn <jannh@google.com>,
Florent Revest <revest@chromium.org>,
Brendan Jackman <jackmanb@chromium.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH bpf-next v6 3/8] bpf: lsm: provide attachment points for BPF LSM programs
Date: Wed, 25 Mar 2020 12:28:59 -0700 [thread overview]
Message-ID: <202003251225.923FF1DD7@keescook> (raw)
In-Reply-To: <20200325152629.6904-4-kpsingh@chromium.org>
On Wed, Mar 25, 2020 at 04:26:24PM +0100, KP Singh wrote:
> From: KP Singh <kpsingh@google.com>
>
> When CONFIG_BPF_LSM is enabled, nop functions, bpf_lsm_<hook_name>, are
> generated for each LSM hook. These functions are initialized as LSM
> hooks in a subsequent patch.
>
> Signed-off-by: KP Singh <kpsingh@google.com>
> Reviewed-by: Brendan Jackman <jackmanb@google.com>
> Reviewed-by: Florent Revest <revest@google.com>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Acked-by: Yonghong Song <yhs@fb.com>
> ---
> include/linux/bpf_lsm.h | 22 ++++++++++++++++++++++
> kernel/bpf/bpf_lsm.c | 14 ++++++++++++++
> 2 files changed, 36 insertions(+)
> create mode 100644 include/linux/bpf_lsm.h
>
> diff --git a/include/linux/bpf_lsm.h b/include/linux/bpf_lsm.h
> new file mode 100644
> index 000000000000..83b96895829f
> --- /dev/null
> +++ b/include/linux/bpf_lsm.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/*
> + * Copyright (C) 2020 Google LLC.
> + */
> +
> +#ifndef _LINUX_BPF_LSM_H
> +#define _LINUX_BPF_LSM_H
> +
> +#include <linux/bpf.h>
> +#include <linux/lsm_hooks.h>
> +
> +#ifdef CONFIG_BPF_LSM
> +
> +#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
> + RET bpf_lsm_##NAME(__VA_ARGS__);
> +#include <linux/lsm_hook_defs.h>
> +#undef LSM_HOOK
> +
> +#endif /* CONFIG_BPF_LSM */
> +
> +#endif /* _LINUX_BPF_LSM_H */
> diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
> index 82875039ca90..1210a819ca52 100644
> --- a/kernel/bpf/bpf_lsm.c
> +++ b/kernel/bpf/bpf_lsm.c
> @@ -7,6 +7,20 @@
> #include <linux/filter.h>
> #include <linux/bpf.h>
> #include <linux/btf.h>
> +#include <linux/lsm_hooks.h>
> +#include <linux/bpf_lsm.h>
> +
> +/* For every LSM hook that allows attachment of BPF programs, declare a nop
> + * function where a BPF program can be attached.
> + */
> +#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
> +noinline __weak RET bpf_lsm_##NAME(__VA_ARGS__) \
I don't think the __weak is needed any more here?
> +{ \
> + return DEFAULT; \
I'm impressed that LSM_RET_VOID actually works. :)
-Kees
> +}
> +
> +#include <linux/lsm_hook_defs.h>
> +#undef LSM_HOOK
>
> const struct bpf_prog_ops lsm_prog_ops = {
> };
> --
> 2.20.1
>
--
Kees Cook
next prev parent reply other threads:[~2020-03-25 19:29 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 15:26 [PATCH bpf-next v6 0/8] MAC and Audit policy using eBPF (KRSI) KP Singh
2020-03-25 15:26 ` [PATCH bpf-next v6 1/8] bpf: Introduce BPF_PROG_TYPE_LSM KP Singh
2020-03-26 1:51 ` Andrii Nakryiko
2020-03-26 13:11 ` KP Singh
2020-03-25 15:26 ` [PATCH bpf-next v6 2/8] security: Refactor declaration of LSM hooks KP Singh
2020-03-25 22:25 ` Casey Schaufler
2020-03-25 23:46 ` KP Singh
2020-03-25 15:26 ` [PATCH bpf-next v6 3/8] bpf: lsm: provide attachment points for BPF LSM programs KP Singh
2020-03-25 19:28 ` Kees Cook [this message]
2020-03-25 19:39 ` KP Singh
2020-03-25 20:07 ` Kees Cook
2020-03-25 20:14 ` KP Singh
2020-03-25 15:26 ` [PATCH bpf-next v6 4/8] bpf: lsm: Implement attach, detach and execution KP Singh
2020-03-26 1:49 ` Andrii Nakryiko
2020-03-26 13:35 ` KP Singh
2020-03-25 15:26 ` [PATCH bpf-next v6 5/8] bpf: lsm: Initialize the BPF LSM hooks KP Singh
2020-03-25 19:30 ` Kees Cook
2020-03-25 15:26 ` [PATCH bpf-next v6 6/8] tools/libbpf: Add support for BPF_PROG_TYPE_LSM KP Singh
2020-03-26 1:56 ` Andrii Nakryiko
2020-03-25 15:26 ` [PATCH bpf-next v6 7/8] bpf: lsm: Add selftests " KP Singh
2020-03-26 2:01 ` Andrii Nakryiko
2020-03-26 13:36 ` KP Singh
2020-03-25 15:26 ` [PATCH bpf-next v6 8/8] bpf: lsm: Add Documentation KP Singh
2020-03-25 19:24 ` [PATCH bpf-next v6 0/8] MAC and Audit policy using eBPF (KRSI) Kees Cook
2020-03-25 19:42 ` KP Singh
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