From: Jiri Olsa <jolsa@redhat.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>
Subject: [PATCHv2 bpf-next 2/5] selftests/bpf: Add test to access int ptr argument in tracing program
Date: Wed, 8 Dec 2021 20:32:42 +0100 [thread overview]
Message-ID: <20211208193245.172141-3-jolsa@kernel.org> (raw)
In-Reply-To: <20211208193245.172141-1-jolsa@kernel.org>
Adding verifier test for accessing int pointer argument in
tracing programs.
The test program loads 2nd argument of bpf_modify_return_test
function which is int pointer and checks that verifier allows
that.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
.../testing/selftests/bpf/verifier/btf_ctx_access.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
create mode 100644 tools/testing/selftests/bpf/verifier/btf_ctx_access.c
diff --git a/tools/testing/selftests/bpf/verifier/btf_ctx_access.c b/tools/testing/selftests/bpf/verifier/btf_ctx_access.c
new file mode 100644
index 000000000000..6340db6b46dc
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/btf_ctx_access.c
@@ -0,0 +1,12 @@
+{
+ "btf_ctx_access accept",
+ .insns = {
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 8), /* load 2nd argument value (int pointer) */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_TRACING,
+ .expected_attach_type = BPF_TRACE_FENTRY,
+ .kfunc = "bpf_modify_return_test",
+},
--
2.33.1
next prev parent reply other threads:[~2021-12-08 19:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-08 19:32 [PATCHv2 bpf-next 0/5] bpf: Add helpers to access traced function arguments Jiri Olsa
2021-12-08 19:32 ` [PATCHv2 bpf-next 1/5] bpf: Allow access to int pointer arguments in tracing programs Jiri Olsa
2021-12-08 19:32 ` Jiri Olsa [this message]
2021-12-08 19:32 ` [PATCHv2 bpf-next 3/5] bpf, x64: Replace some stack_size usage with offset variables Jiri Olsa
2021-12-08 19:32 ` [PATCHv2 bpf-next 4/5] bpf: Add get_func_[arg|ret|arg_cnt] helpers Jiri Olsa
2021-12-13 17:45 ` Alexei Starovoitov
2021-12-08 19:32 ` [PATCHv2 bpf-next 5/5] selftests/bpf: Add tests for " Jiri Olsa
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