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Miller" , "Michael S . Tsirkin" Subject: [RFC net-next 18/18] virtio_net: restrict bpf helper calls from offloaded program Date: Tue, 26 Nov 2019 19:07:44 +0900 Message-Id: <20191126100744.5083-19-prashantbhole.linux@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191126100744.5083-1-prashantbhole.linux@gmail.com> References: <20191126100744.5083-1-prashantbhole.linux@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::1043 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , Jakub Kicinski , Jesper Dangaard Brouer , Daniel Borkmann , netdev@vger.kernel.org, Jason Wang , John Fastabend , Alexei Starovoitov , qemu-devel@nongnu.org, Prashant Bhole , kvm@vger.kernel.org, Yonghong Song , Andrii Nakryiko , Martin KaFai Lau Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Since we are offloading this program to the host, some of the helper calls will not make sense. For example get_numa_node_id. Some helpers can not be used because we don't handle them yet. So let's allow a small set of helper calls for now. Signed-off-by: Prashant Bhole --- drivers/net/virtio_net.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 91a94b787c64..ab5be6b95bbd 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -2549,6 +2549,25 @@ static struct virtnet_bpf_map *virtnet_get_bpf_map(s= truct virtnet_info *vi, return NULL; } =20 +static int virtnet_bpf_check_helper_call(struct bpf_insn *insn) +{ + switch (insn->imm) { + case BPF_FUNC_map_lookup_elem: + case BPF_FUNC_map_update_elem: + case BPF_FUNC_map_delete_elem: + case BPF_FUNC_ktime_get_ns: + case BPF_FUNC_get_prandom_u32: + case BPF_FUNC_csum_update: + case BPF_FUNC_xdp_adjust_head: + case BPF_FUNC_xdp_adjust_meta: + case BPF_FUNC_xdp_adjust_tail: + case BPF_FUNC_strtol: + case BPF_FUNC_strtoul: + return 0; + } + return -EOPNOTSUPP; +} + static int virtnet_bpf_verify_insn(struct bpf_verifier_env *env, int insn_= idx, int prev_insn) { @@ -2830,6 +2849,7 @@ static int virtnet_bpf_verifier_setup(struct bpf_prog= *prog) struct virtnet_bpf_bound_prog *state; struct virtnet_bpf_map *virtnet_map; struct bpf_map *map; + u8 opcode, class; struct fd mapfd; int i, err =3D 0; =20 @@ -2846,6 +2866,16 @@ static int virtnet_bpf_verifier_setup(struct bpf_pro= g *prog) for (i =3D 0; i < state->len; i++) { struct bpf_insn *insn =3D &state->insnsi[i]; =20 + opcode =3D BPF_OP(insn->code); + class =3D BPF_CLASS(insn->code); + + if ((class =3D=3D BPF_JMP || class =3D=3D BPF_JMP32) && + opcode =3D=3D BPF_CALL && insn->src_reg !=3D BPF_PSEUDO_CALL) { + if (virtnet_bpf_check_helper_call(insn)) + return -EOPNOTSUPP; + continue; + } + if (insn->code !=3D (BPF_LD | BPF_IMM | BPF_DW)) continue; =20 --=20 2.20.1