From: Lorenz Bauer <lmb@cloudflare.com>
To: ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org,
bpf@vger.kernel.org
Cc: kafai@fb.com, theojulienne@github.com, Lorenz Bauer <lmb@cloudflare.com>
Subject: [PATCH v2 7/8] selftests/bpf: test references to sock_common
Date: Thu, 14 Mar 2019 11:39:53 +0000 [thread overview]
Message-ID: <20190314113954.10210-8-lmb@cloudflare.com> (raw)
In-Reply-To: <20190314113954.10210-1-lmb@cloudflare.com>
Make sure that returning a struct sock_common * reference invokes
the reference tracking machinery in the verifier.
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
---
.../selftests/bpf/verifier/ref_tracking.c | 48 +++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/tools/testing/selftests/bpf/verifier/ref_tracking.c b/tools/testing/selftests/bpf/verifier/ref_tracking.c
index a6905e5017dc..ebcbf154c460 100644
--- a/tools/testing/selftests/bpf/verifier/ref_tracking.c
+++ b/tools/testing/selftests/bpf/verifier/ref_tracking.c
@@ -9,6 +9,17 @@
.errstr = "Unreleased reference",
.result = REJECT,
},
+{
+ "reference tracking: leak potential reference to sock_common",
+ .insns = {
+ BPF_SK_LOOKUP(skc_lookup_tcp),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), /* leak reference */
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .errstr = "Unreleased reference",
+ .result = REJECT,
+},
{
"reference tracking: leak potential reference on stack",
.insns = {
@@ -49,6 +60,17 @@
.errstr = "Unreleased reference",
.result = REJECT,
},
+{
+ "reference tracking: zero potential reference to sock_common",
+ .insns = {
+ BPF_SK_LOOKUP(skc_lookup_tcp),
+ BPF_MOV64_IMM(BPF_REG_0, 0), /* leak reference */
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .errstr = "Unreleased reference",
+ .result = REJECT,
+},
{
"reference tracking: copy and zero potential references",
.insns = {
@@ -76,6 +98,20 @@
.errstr = "type=sock_or_null expected=sock",
.result = REJECT,
},
+{
+ "reference tracking: release reference to sock_common without check",
+ .insns = {
+ BPF_SK_LOOKUP(skc_lookup_tcp),
+ /* reference in r0 may be NULL */
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_EMIT_CALL(BPF_FUNC_sk_release),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .errstr = "type=sock_common_or_null expected=sock",
+ .result = REJECT,
+},
{
"reference tracking: release reference",
.insns = {
@@ -88,6 +124,18 @@
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
+{
+ "reference tracking: release reference to sock_common",
+ .insns = {
+ BPF_SK_LOOKUP(skc_lookup_tcp),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
+ BPF_EMIT_CALL(BPF_FUNC_sk_release),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .result = ACCEPT,
+},
{
"reference tracking: release reference 2",
.insns = {
--
2.19.1
next prev parent reply other threads:[~2019-03-14 11:40 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190222095057.9442-1-lmb@cloudflare.com>
2019-03-14 11:39 ` [PATCH v2 0/8] Allow checking SYN cookies from XDP and tc cls act Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 1/8] bpf: track references based on is_acquire_func Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 2/8] bpf: allow helpers to return PTR_TO_SOCK_COMMON Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 3/8] bpf: add skc_lookup_tcp helper Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 4/8] bpf: add helper to check for a valid SYN cookie Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 5/8] tools: update include/uapi/linux/bpf.h Lorenz Bauer
2019-03-14 11:39 ` [PATCH v2 6/8] selftests/bpf: allow specifying helper for BPF_SK_LOOKUP Lorenz Bauer
2019-03-14 11:39 ` Lorenz Bauer [this message]
2019-03-14 11:39 ` [PATCH v2 8/8] selftests/bpf: add tests for bpf_tcp_check_syncookie and bpf_skc_lookup_tcp Lorenz Bauer
2019-03-15 20:42 ` [PATCH v2 0/8] Allow checking SYN cookies from XDP and tc cls act Alexei Starovoitov
2019-03-19 10:20 ` Lorenz Bauer
2019-03-19 10:20 ` [PATCH v2 1/8] bpf: track references based on is_acquire_func Lorenz Bauer
2019-03-19 10:20 ` [PATCH v2 2/8] bpf: allow helpers to return PTR_TO_SOCK_COMMON Lorenz Bauer
2019-03-19 10:20 ` [PATCH v2 3/8] bpf: add skc_lookup_tcp helper Lorenz Bauer
2019-03-19 21:30 ` Alexei Starovoitov
2019-03-19 10:20 ` [PATCH v2 4/8] bpf: add helper to check for a valid SYN cookie Lorenz Bauer
2019-03-19 22:17 ` Alexei Starovoitov
2019-03-21 2:09 ` Lorenz Bauer
2019-03-21 3:03 ` Alexei Starovoitov
2019-03-21 4:53 ` Lorenz Bauer
2019-03-21 5:50 ` Alexei Starovoitov
2019-03-19 10:21 ` [PATCH v2 5/8] tools: update include/uapi/linux/bpf.h Lorenz Bauer
2019-03-19 10:21 ` [PATCH v2 6/8] selftests/bpf: allow specifying helper for BPF_SK_LOOKUP Lorenz Bauer
2019-03-19 10:21 ` [PATCH v2 7/8] selftests/bpf: test references to sock_common Lorenz Bauer
2019-03-19 10:21 ` [PATCH v2 8/8] selftests/bpf: add tests for bpf_tcp_check_syncookie and bpf_skc_lookup_tcp Lorenz Bauer
2019-03-22 1:53 ` [PATCH bpf-next v3 0/8] Allow checking SYN cookies from XDP and tc cls act Lorenz Bauer
2019-03-22 1:53 ` [PATCH bpf-next v3 1/8] bpf: track references based on is_acquire_func Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 2/8] bpf: allow helpers to return PTR_TO_SOCK_COMMON Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 3/8] bpf: add skc_lookup_tcp helper Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 4/8] bpf: add helper to check for a valid SYN cookie Lorenz Bauer
2019-03-22 2:06 ` Alexei Starovoitov
2019-03-22 2:52 ` Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 5/8] tools: update include/uapi/linux/bpf.h Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 6/8] selftests/bpf: allow specifying helper for BPF_SK_LOOKUP Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 7/8] selftests/bpf: test references to sock_common Lorenz Bauer
2019-03-22 1:54 ` [PATCH bpf-next v3 8/8] selftests/bpf: add tests for bpf_tcp_check_syncookie and bpf_skc_lookup_tcp Lorenz Bauer
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