From: Lorenzo Bianconi <lorenzo@kernel.org>
To: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
andrii@kernel.org, davem@davemloft.net, kuba@kernel.org,
edumazet@google.com, pabeni@redhat.com, pablo@netfilter.org,
fw@strlen.de, netfilter-devel@vger.kernel.org,
lorenzo.bianconi@redhat.com, brouer@redhat.com, toke@redhat.com,
memxor@gmail.com
Subject: [PATCH v3 bpf-next 2/5] selftests/bpf: Add verifier selftests for forced kfunc ref args
Date: Wed, 18 May 2022 12:43:35 +0200 [thread overview]
Message-ID: <987c9577695ef9d03c839100289dc432c7e22e4a.1652870182.git.lorenzo@kernel.org> (raw)
In-Reply-To: <cover.1652870182.git.lorenzo@kernel.org>
From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Make sure verifier rejects the bad cases and ensure the good case keeps
working. The selftests make use of the bpf_kfunc_call_test_ref kfunc
added in the previous patch only for verification.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
tools/testing/selftests/bpf/verifier/calls.c | 53 ++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/tools/testing/selftests/bpf/verifier/calls.c b/tools/testing/selftests/bpf/verifier/calls.c
index 743ed34c1238..3fb4f69b1962 100644
--- a/tools/testing/selftests/bpf/verifier/calls.c
+++ b/tools/testing/selftests/bpf/verifier/calls.c
@@ -218,6 +218,59 @@
.result = REJECT,
.errstr = "variable ptr_ access var_off=(0x0; 0x7) disallowed",
},
+{
+ "calls: invalid kfunc call: referenced arg needs refcounted PTR_TO_BTF_ID",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_1, 0, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+ BPF_EXIT_INSN(),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6, 16),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .fixup_kfunc_btf_id = {
+ { "bpf_kfunc_call_test_acquire", 3 },
+ { "bpf_kfunc_call_test_ref", 8 },
+ { "bpf_kfunc_call_test_ref", 10 },
+ },
+ .result_unpriv = REJECT,
+ .result = REJECT,
+ .errstr = "R1 must be referenced",
+},
+{
+ "calls: valid kfunc call: referenced arg needs refcounted PTR_TO_BTF_ID",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_1, 0, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+ BPF_EXIT_INSN(),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .fixup_kfunc_btf_id = {
+ { "bpf_kfunc_call_test_acquire", 3 },
+ { "bpf_kfunc_call_test_ref", 8 },
+ { "bpf_kfunc_call_test_release", 10 },
+ },
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+},
{
"calls: basic sanity",
.insns = {
--
2.35.3
next prev parent reply other threads:[~2022-05-18 10:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 10:43 [PATCH v3 bpf-next 0/5] net: netfilter: add kfunc helper to update ct timeout Lorenzo Bianconi
2022-05-18 10:43 ` [PATCH v3 bpf-next 1/5] bpf: Add support for forcing kfunc args to be referenced Lorenzo Bianconi
2022-05-18 17:58 ` Yonghong Song
2022-05-18 18:06 ` Kumar Kartikeya Dwivedi
2022-05-18 18:23 ` Yonghong Song
2022-05-18 10:43 ` Lorenzo Bianconi [this message]
2022-05-18 18:25 ` [PATCH v3 bpf-next 2/5] selftests/bpf: Add verifier selftests for forced kfunc ref args Yonghong Song
2022-05-18 10:43 ` [PATCH v3 bpf-next 3/5] net: netfilter: add kfunc helper to update ct timeout Lorenzo Bianconi
2022-05-18 20:42 ` Toke Høiland-Jørgensen
2022-05-18 10:43 ` [PATCH v3 bpf-next 4/5] net: netfilter: add kfunc helper to add a new ct entry Lorenzo Bianconi
2022-05-18 20:47 ` Toke Høiland-Jørgensen
2022-05-18 21:08 ` Lorenzo Bianconi
2022-05-18 22:14 ` Alexei Starovoitov
2022-05-18 22:43 ` Kumar Kartikeya Dwivedi
2022-05-19 10:45 ` Toke Høiland-Jørgensen
2022-05-19 11:23 ` Kumar Kartikeya Dwivedi
2022-05-19 17:00 ` Yonghong Song
2022-05-19 17:10 ` Kumar Kartikeya Dwivedi
2022-05-19 2:06 ` kernel test robot
2022-05-18 10:43 ` [PATCH v3 bpf-next 5/5] selftests/bpf: add selftest for bpf_xdp_ct_add and bpf_ct_refresh_timeout kfunc Lorenzo Bianconi
2022-05-18 18:55 ` Yonghong Song
2022-05-18 20:38 ` Lorenzo Bianconi
2022-05-20 22:04 ` Andrii Nakryiko
2022-05-21 9:56 ` Lorenzo Bianconi
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