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Fri, 29 Dec 2023 00:15:49 -0800 (PST) Received: from localhost.localdomain ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id h12-20020a63df4c000000b005bd2b3a03eesm14339412pgj.6.2023.12.29.00.15.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Dec 2023 00:15:49 -0800 (PST) From: Menglong Dong To: andrii@kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mykolal@fb.com, shuah@kernel.org, horms@kernel.org, dhowells@redhat.com, linyunsheng@huawei.com, aleksander.lobakin@intel.com, joannelkoong@gmail.com, laoar.shao@gmail.com, kuifeng@meta.com, menglong8.dong@gmail.com, bjorn@rivosinc.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next 2/2] testcases/bpf: add testcases for skb->csum to ctx_skb.c Date: Fri, 29 Dec 2023 16:14:09 +0800 Message-Id: <20231229081409.1276386-3-menglong8.dong@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231229081409.1276386-1-menglong8.dong@gmail.com> References: <20231229081409.1276386-1-menglong8.dong@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786603444779875546 X-GMAIL-MSGID: 1786603444779875546 The testcases for read/write access of skb->csum is added to ctx_skb.c. And the read access testing for skb->ip_summed is also added. Signed-off-by: Menglong Dong --- .../testing/selftests/bpf/verifier/ctx_skb.c | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/tools/testing/selftests/bpf/verifier/ctx_skb.c b/tools/testing/selftests/bpf/verifier/ctx_skb.c index 0b394a7f7a2d..f15301686843 100644 --- a/tools/testing/selftests/bpf/verifier/ctx_skb.c +++ b/tools/testing/selftests/bpf/verifier/ctx_skb.c @@ -1193,3 +1193,46 @@ .prog_type = BPF_PROG_TYPE_SK_SKB, .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS, }, +{ + "valid access __sk_buff csum", + .insns = { + BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, + offsetof(struct __sk_buff, csum)), + BPF_EXIT_INSN(), + }, + .result = ACCEPT, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, +}, +{ + "valid access __sk_buff ip_summed", + .insns = { + BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, + offsetof(struct __sk_buff, ip_summed)), + BPF_EXIT_INSN(), + }, + .result = ACCEPT, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, +}, +{ + "check skb->csum is writeable by CLS/ACT", + .insns = { + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, + offsetof(struct __sk_buff, csum)), + BPF_EXIT_INSN(), + }, + .result = ACCEPT, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, + .errstr = "invalid bpf_context access", +}, +{ + "check skb->ip_summed is not writeable", + .insns = { + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, + offsetof(struct __sk_buff, csum)), + BPF_EXIT_INSN(), + }, + .result = REJECT, + .errstr = "invalid bpf_context access", +},