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(host-176-36-0-241.b024.la.net.ua. [176.36.0.241]) by smtp.gmail.com with ESMTPSA id c10-20020a19e34a000000b004b4930d53b5sm3876784lfk.134.2022.12.31.08.31.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 31 Dec 2022 08:31:55 -0800 (PST) From: Eduard Zingerman To: bpf@vger.kernel.org, ast@kernel.org Cc: andrii@kernel.org, daniel@iogearbox.net, kernel-team@fb.com, yhs@fb.com, Eduard Zingerman Subject: [RFC bpf-next 2/5] selftests/bpf: check if verifier tracks constants spilled by BPF_ST_MEM Date: Sat, 31 Dec 2022 18:31:19 +0200 Message-Id: <20221231163122.1360813-3-eddyz87@gmail.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221231163122.1360813-1-eddyz87@gmail.com> References: <20221231163122.1360813-1-eddyz87@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Check that verifier tracks the value of 'imm' spilled to stack by BPF_ST_MEM instruction. Cover the following cases: - write of non-zero constant to stack; - write of a zero constant to stack. Signed-off-by: Eduard Zingerman --- .../selftests/bpf/verifier/bpf_st_mem.c | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 tools/testing/selftests/bpf/verifier/bpf_st_mem.c diff --git a/tools/testing/selftests/bpf/verifier/bpf_st_mem.c b/tools/testing/selftests/bpf/verifier/bpf_st_mem.c new file mode 100644 index 000000000000..d3aa293f1a9d --- /dev/null +++ b/tools/testing/selftests/bpf/verifier/bpf_st_mem.c @@ -0,0 +1,29 @@ +{ + "BPF_ST_MEM stack imm non-zero", + .insns = { + BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 42), + BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8), + BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, -42), + /* if value is tracked correctly R0 is zero */ + BPF_EXIT_INSN(), + }, + .result = ACCEPT, +}, +{ + "BPF_ST_MEM stack imm zero", + .insns = { + /* mark stack 0000 0000 */ + BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), + /* read and sum a few bytes */ + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -8), + BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1), + BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -4), + BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1), + BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, -1), + BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1), + /* if value is tracked correctly R0 is zero */ + BPF_EXIT_INSN(), + }, + .result = ACCEPT, +}, -- 2.39.0