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Date: Mon, 23 Mar 2020 17:44:11 +0100 From: KP Singh <kpsingh@...omium.org> To: linux-kernel@...r.kernel.org, bpf@...r.kernel.org, linux-security-module@...r.kernel.org Cc: Brendan Jackman <jackmanb@...gle.com>, Florent Revest <revest@...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: [PATCH bpf-next v5 3/7] bpf: lsm: provide attachment points for BPF LSM programs From: KP Singh <kpsingh@...gle.com> When CONFIG_BPF_LSM is enabled, nops functions, bpf_lsm_<hook_name>, are generated for each LSM hook. These nops are initialized as LSM hooks in a subsequent patch. Signed-off-by: KP Singh <kpsingh@...gle.com> Reviewed-by: Brendan Jackman <jackmanb@...gle.com> Reviewed-by: Florent Revest <revest@...gle.com> --- include/linux/bpf_lsm.h | 21 +++++++++++++++++++++ kernel/bpf/bpf_lsm.c | 19 +++++++++++++++++++ 2 files changed, 40 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..c6423a140220 --- /dev/null +++ b/include/linux/bpf_lsm.h @@ -0,0 +1,21 @@ +/* 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, NAME, ...) RET bpf_lsm_##NAME(__VA_ARGS__); +#include <linux/lsm_hook_names.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..530d137f7a84 100644 --- a/kernel/bpf/bpf_lsm.c +++ b/kernel/bpf/bpf_lsm.c @@ -7,6 +7,25 @@ #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 as an fexit trampoline. + */ +#define LSM_HOOK(RET, NAME, ...) LSM_HOOK_##RET(NAME, __VA_ARGS__) + +#define LSM_HOOK_int(NAME, ...) \ +noinline __weak int bpf_lsm_##NAME(__VA_ARGS__) \ +{ \ + return 0; \ +} + +#define LSM_HOOK_void(NAME, ...) \ +noinline __weak void bpf_lsm_##NAME(__VA_ARGS__) {} + +#include <linux/lsm_hook_names.h> +#undef LSM_HOOK const struct bpf_prog_ops lsm_prog_ops = { }; -- 2.20.1
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