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Hallyn" , Mauro Carvalho Chehab , "David S. Miller" , Greg Kroah-Hartman , Nicolas Ferre , Stanislav Fomichev , Quentin Monnet , Andrey Ignatov , Joe Stringer Subject: [PATCH bpf-next v3 03/10] bpf: lsm: Introduce types for eBPF based LSM Date: Thu, 23 Jan 2020 07:24:33 -0800 Message-Id: <20200123152440.28956-4-kpsingh@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200123152440.28956-1-kpsingh@chromium.org> References: <20200123152440.28956-1-kpsingh@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: KP Singh A new eBPF program type BPF_PROG_TYPE_LSM with an expected attach type of BPF_LSM_MAC. Attachment to LSM hooks is not implemented in this patch. On defining the types for the program, the macros expect that _prog_ops and _verifier_ops exist. This is implicitly required by the macro: BPF_PROG_TYPE(BPF_PROG_TYPE_LSM, lsm, ...) Signed-off-by: KP Singh Reviewed-by: Brendan Jackman Reviewed-by: Florent Revest Reviewed-by: Thomas Garnier --- include/linux/bpf_types.h | 4 ++++ include/uapi/linux/bpf.h | 2 ++ kernel/bpf/syscall.c | 6 ++++++ security/bpf/Makefile | 2 +- security/bpf/ops.c | 28 ++++++++++++++++++++++++++++ tools/include/uapi/linux/bpf.h | 2 ++ tools/lib/bpf/libbpf_probes.c | 1 + 7 files changed, 44 insertions(+), 1 deletion(-) create mode 100644 security/bpf/ops.c diff --git a/include/linux/bpf_types.h b/include/linux/bpf_types.h index c81d4ece79a4..c36790b202e3 100644 --- a/include/linux/bpf_types.h +++ b/include/linux/bpf_types.h @@ -70,6 +70,10 @@ BPF_PROG_TYPE(BPF_PROG_TYPE_STRUCT_OPS, bpf_struct_ops, void *, void *) BPF_PROG_TYPE(BPF_PROG_TYPE_EXT, bpf_extension, void *, void *) +#ifdef CONFIG_SECURITY_BPF +BPF_PROG_TYPE(BPF_PROG_TYPE_LSM, lsm, + void *, void *) +#endif /* CONFIG_SECURITY_BPF */ #endif BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY, array_map_ops) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index f1d74a2bd234..2f1e24a8c4a4 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -181,6 +181,7 @@ enum bpf_prog_type { BPF_PROG_TYPE_TRACING, BPF_PROG_TYPE_STRUCT_OPS, BPF_PROG_TYPE_EXT, + BPF_PROG_TYPE_LSM, }; enum bpf_attach_type { @@ -210,6 +211,7 @@ enum bpf_attach_type { BPF_TRACE_RAW_TP, BPF_TRACE_FENTRY, BPF_TRACE_FEXIT, + BPF_LSM_MAC, __MAX_BPF_ATTACH_TYPE }; diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index a91ad518c050..eab4a36ee889 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -2396,6 +2396,9 @@ static int bpf_prog_attach(const union bpf_attr *attr) case BPF_LIRC_MODE2: ptype = BPF_PROG_TYPE_LIRC_MODE2; break; + case BPF_LSM_MAC: + ptype = BPF_PROG_TYPE_LSM; + break; case BPF_FLOW_DISSECTOR: ptype = BPF_PROG_TYPE_FLOW_DISSECTOR; break; @@ -2427,6 +2430,9 @@ static int bpf_prog_attach(const union bpf_attr *attr) case BPF_PROG_TYPE_LIRC_MODE2: ret = lirc_prog_attach(attr, prog); break; + case BPF_PROG_TYPE_LSM: + ret = -EOPNOTSUPP; + break; case BPF_PROG_TYPE_FLOW_DISSECTOR: ret = skb_flow_dissector_bpf_prog_attach(attr, prog); break; diff --git a/security/bpf/Makefile b/security/bpf/Makefile index 26a0ab6f99b7..c78a8a056e7e 100644 --- a/security/bpf/Makefile +++ b/security/bpf/Makefile @@ -2,4 +2,4 @@ # # Copyright 2019 Google LLC. -obj-$(CONFIG_SECURITY_BPF) := lsm.o +obj-$(CONFIG_SECURITY_BPF) := lsm.o ops.o diff --git a/security/bpf/ops.c b/security/bpf/ops.c new file mode 100644 index 000000000000..81c2bd9c0495 --- /dev/null +++ b/security/bpf/ops.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Copyright 2019 Google LLC. + */ + +#include +#include + +const struct bpf_prog_ops lsm_prog_ops = { +}; + +static const struct bpf_func_proto *get_bpf_func_proto( + enum bpf_func_id func_id, const struct bpf_prog *prog) +{ + switch (func_id) { + case BPF_FUNC_map_lookup_elem: + return &bpf_map_lookup_elem_proto; + case BPF_FUNC_get_current_pid_tgid: + return &bpf_get_current_pid_tgid_proto; + default: + return NULL; + } +} + +const struct bpf_verifier_ops lsm_verifier_ops = { + .get_func_proto = get_bpf_func_proto, +}; diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index f1d74a2bd234..2f1e24a8c4a4 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -181,6 +181,7 @@ enum bpf_prog_type { BPF_PROG_TYPE_TRACING, BPF_PROG_TYPE_STRUCT_OPS, BPF_PROG_TYPE_EXT, + BPF_PROG_TYPE_LSM, }; enum bpf_attach_type { @@ -210,6 +211,7 @@ enum bpf_attach_type { BPF_TRACE_RAW_TP, BPF_TRACE_FENTRY, BPF_TRACE_FEXIT, + BPF_LSM_MAC, __MAX_BPF_ATTACH_TYPE }; diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c index b782ebef6ac9..2c92059c0c90 100644 --- a/tools/lib/bpf/libbpf_probes.c +++ b/tools/lib/bpf/libbpf_probes.c @@ -108,6 +108,7 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns, case BPF_PROG_TYPE_TRACING: case BPF_PROG_TYPE_STRUCT_OPS: case BPF_PROG_TYPE_EXT: + case BPF_PROG_TYPE_LSM: default: break; } -- 2.20.1