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selftests/bpf: Add test to access int ptr argument in tracing program

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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>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211208193245.172141-3-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2021-12-08 20:32:42 +01:00 committed by Alexei Starovoitov
parent bb6728d756
commit 2b070c2bc8
1 changed files with 12 additions and 0 deletions

12
tools/testing/selftests/bpf/verifier/btf_ctx_access.c Normal file
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@ -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",
},