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[2001:8b0:7a5a:26ff:12c:79ca:eceb:6c0e]) by smtp.gmail.com with ESMTPSA id l10sm2225084wru.59.2020.09.25.02.56.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Sep 2020 02:56:46 -0700 (PDT) From: Lorenz Bauer To: Alexei Starovoitov , Daniel Borkmann , John Fastabend , Jakub Sitnicki , Lorenz Bauer , "David S. Miller" , Jakub Kicinski Cc: kernel-team@cloudflare.com, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next 1/4] bpf: sockmap: enable map_update_elem from bpf_iter Date: Fri, 25 Sep 2020 10:56:27 +0100 Message-Id: <20200925095630.49207-2-lmb@cloudflare.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200925095630.49207-1-lmb@cloudflare.com> References: <20200925095630.49207-1-lmb@cloudflare.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Allow passing a pointer to a BTF struct sock_common* when updating a sockmap or sockhash. Since BTF pointers can fault and therefore be NULL at runtime we need to add an additional !sk check to sock_map_update_elem. Doing this allows calling map_update_elem on sockmap from bpf_iter context, which uses BTF pointers. Signed-off-by: Lorenz Bauer Reported-by: kernel test robot --- kernel/bpf/verifier.c | 2 +- net/core/sock_map.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index d4ba29fb17a6..5bd0239da8b6 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -3943,7 +3943,7 @@ static int resolve_map_arg_type(struct bpf_verifier_env *env, case BPF_MAP_TYPE_SOCKMAP: case BPF_MAP_TYPE_SOCKHASH: if (*arg_type == ARG_PTR_TO_MAP_VALUE) { - *arg_type = ARG_PTR_TO_SOCKET; + *arg_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON; } else { verbose(env, "invalid arg_type for sockmap/sockhash\n"); return -EINVAL; diff --git a/net/core/sock_map.c b/net/core/sock_map.c index e1f05e3fa1d0..497e7df466d4 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -610,6 +610,9 @@ static int sock_map_update_elem(struct bpf_map *map, void *key, struct sock *sk = (struct sock *)value; int ret; + if (unlikely(!sk)) + return -EINVAL; + if (!sock_map_sk_is_suitable(sk)) return -EOPNOTSUPP;