From: Yonghong Song <yhs@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>,
John Fastabend <john.fastabend@gmail.com>
Subject: [PATCH bpf 2/2] tools/bpf: add a verifier test for assigning 32bit reg states to 64bit ones
Date: Thu, 28 May 2020 09:50:44 -0700 [thread overview]
Message-ID: <20200528165044.1568896-1-yhs@fb.com> (raw)
In-Reply-To: <20200528165043.1568623-1-yhs@fb.com>
Added a verifier test for assigning 32bit reg states to
64bit where 32bit reg holds a constant value of 0.
Without previous kernel verifier.c fix, the test in
this patch will fail.
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
---
tools/testing/selftests/bpf/verifier/bounds.c | 22 +++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/tools/testing/selftests/bpf/verifier/bounds.c b/tools/testing/selftests/bpf/verifier/bounds.c
index a253a064e6e0..e2739ca2abec 100644
--- a/tools/testing/selftests/bpf/verifier/bounds.c
+++ b/tools/testing/selftests/bpf/verifier/bounds.c
@@ -539,3 +539,25 @@
},
.result = ACCEPT
},
+{
+ "assigning 32bit bounds to 64bit for wA = 0, wB = wA",
+ .insns = {
+ BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_1,
+ offsetof(struct __sk_buff, data_end)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
+ offsetof(struct __sk_buff, data)),
+ BPF_MOV32_IMM(BPF_REG_9, 0),
+ BPF_MOV32_REG(BPF_REG_2, BPF_REG_9),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_7),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_2),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 8),
+ BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_8, 1),
+ BPF_LDX_MEM(BPF_W, BPF_REG_5, BPF_REG_6, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .result = ACCEPT,
+ .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
+},
--
2.24.1
prev parent reply other threads:[~2020-05-28 17:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-28 16:50 [PATCH bpf 0/2] bpf: fix a verifier issue when assigning 32bit reg states to 64bit ones Yonghong Song
2020-05-28 16:50 ` [PATCH bpf 1/2] " Yonghong Song
2020-05-28 20:36 ` Alexei Starovoitov
2020-05-28 21:22 ` Yonghong Song
2020-05-28 21:30 ` John Fastabend
2020-05-28 21:58 ` Yonghong Song
2020-05-28 16:50 ` Yonghong Song [this message]
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