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Message-ID: <20240115082028.9992-2-sunhao.th@gmail.com>
Date: Mon, 15 Jan 2024 09:20:28 +0100
From: Hao Sun <sunhao.th@...il.com>
To: bpf@...r.kernel.org
Cc: willemb@...gle.com,
ast@...nel.org,
andrii@...nel.org,
daniel@...earbox.net,
eddyz87@...il.com,
yonghong.song@...ux.dev,
linux-kernel@...r.kernel.org,
Hao Sun <sunhao.th@...il.com>
Subject: [PATCH v4 2/2] selftests/bpf: Add test for alu on PTR_TO_FLOW_KEYS
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 <sunhao.th@...il.com>
---
.../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";
--
2.34.1
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