From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
To: bpf@vger.kernel.org
Cc: "Yonghong Song" <yhs@fb.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Pablo Neira Ayuso" <pablo@netfilter.org>,
"Florian Westphal" <fw@strlen.de>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
"Lorenzo Bianconi" <lorenzo@kernel.org>,
netdev@vger.kernel.org, netfilter-devel@vger.kernel.org
Subject: [PATCH bpf-next v7 10/13] selftests/bpf: Add verifier tests for trusted kfunc args
Date: Thu, 21 Jul 2022 15:42:42 +0200 [thread overview]
Message-ID: <20220721134245.2450-11-memxor@gmail.com> (raw)
In-Reply-To: <20220721134245.2450-1-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.
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
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 = {
--
2.34.1
next prev parent reply other threads:[~2022-07-21 13:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-21 13:42 [PATCH bpf-next v7 00/13] New nf_conntrack kfuncs for insertion, changing timeout, status Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 01/13] bpf: Introduce 8-byte BTF set Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 02/13] tools/resolve_btfids: Add support for 8-byte BTF sets Kumar Kartikeya Dwivedi
2022-07-21 20:51 ` Jiri Olsa
2022-07-21 13:42 ` [PATCH bpf-next v7 03/13] bpf: Switch to new kfunc flags infrastructure Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 04/13] bpf: Add support for forcing kfunc args to be trusted Kumar Kartikeya Dwivedi
2022-07-22 4:10 ` Alexei Starovoitov
2022-07-22 10:26 ` Kumar Kartikeya Dwivedi
2022-07-25 9:52 ` Roberto Sassu
2022-07-26 9:30 ` Kumar Kartikeya Dwivedi
2022-07-26 10:02 ` Roberto Sassu
2022-07-26 12:55 ` Kumar Kartikeya Dwivedi
2022-07-26 12:58 ` Roberto Sassu
2022-07-21 13:42 ` [PATCH bpf-next v7 05/13] bpf: Add documentation for kfuncs Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 06/13] net: netfilter: Deduplicate code in bpf_{xdp,skb}_ct_lookup Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 07/13] net: netfilter: Add kfuncs to allocate and insert CT Kumar Kartikeya Dwivedi
2022-07-22 9:02 ` Pablo Neira Ayuso
2022-07-22 9:39 ` Kumar Kartikeya Dwivedi
2022-07-23 7:50 ` Pablo Neira Ayuso
2022-07-25 8:52 ` Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 08/13] net: netfilter: Add kfuncs to set and change CT timeout Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 09/13] net: netfilter: Add kfuncs to set and change CT status Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` Kumar Kartikeya Dwivedi [this message]
2022-07-21 13:42 ` [PATCH bpf-next v7 11/13] selftests/bpf: Add tests for new nf_conntrack kfuncs Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 12/13] selftests/bpf: Add negative " Kumar Kartikeya Dwivedi
2022-07-21 13:42 ` [PATCH bpf-next v7 13/13] selftests/bpf: Fix test_verifier failed test in unprivileged mode Kumar Kartikeya Dwivedi
2022-07-21 17:28 ` [PATCH bpf-next v7 00/13] New nf_conntrack kfuncs for insertion, changing timeout, status Zvi Effron
2022-07-21 18:01 ` Kumar Kartikeya Dwivedi
2022-07-22 4:10 ` patchwork-bot+netdevbpf
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