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[2001:67c:10ec:5784:8000::16b]) by smtp.gmail.com with ESMTPSA id u17-20020a05600c19d100b0040e47dc2e8fsm14981194wmq.6.2024.01.15.00.20.36 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 15 Jan 2024 00:20:36 -0800 (PST) From: Hao Sun To: bpf@vger.kernel.org Cc: willemb@google.com, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, yonghong.song@linux.dev, linux-kernel@vger.kernel.org, Hao Sun Subject: [PATCH v4 2/2] selftests/bpf: Add test for alu on PTR_TO_FLOW_KEYS Date: Mon, 15 Jan 2024 09:20:28 +0100 Message-ID: <20240115082028.9992-2-sunhao.th@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240115082028.9992-1-sunhao.th@gmail.com> References: <20240115082028.9992-1-sunhao.th@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: 1788144034850788099 X-GMAIL-MSGID: 1788144034850788099 Add a test case for PTR_TO_FLOW_KEYS alu. Testing if alu with variable offset on flow_keys is rejected. Signed-off-by: Hao Sun Acked-by: Yonghong Song --- .../bpf/progs/verifier_value_illegal_alu.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c b/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c index 71814a753216..a9ab37d3b9e2 100644 --- a/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c +++ b/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c @@ -146,4 +146,23 @@ l0_%=: exit; \ : __clobber_all); } +SEC("flow_dissector") +__description("flow_keys illegal alu op with variable offset") +__failure __msg("R7 pointer arithmetic on flow_keys prohibited") +__naked void flow_keys_illegal_variable_offset_alu(void) +{ + asm volatile(" \ + r6 = r1; \ + r7 = *(u64*)(r6 + %[flow_keys_off]); \ + r8 = 8; \ + r8 /= 1; \ + r8 &= 8; \ + r7 += r8; \ + r0 = *(u64*)(r7 + 0); \ + exit; \ +" : + : __imm_const(flow_keys_off, offsetof(struct __sk_buff, flow_keys)) + : __clobber_all); +} + char _license[] SEC("license") = "GPL";