From: Paul Chaignon <paul.chaignon@orange.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: xiao.han@orange.com, paul.chaignon@gmail.com,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>
Subject: [PATCH bpf-next 2/2] selftests/bpf: test case for invalid call stack in dead code
Date: Wed, 20 Mar 2019 13:58:50 +0100 [thread overview]
Message-ID: <ea79f2c1e155346b1ff09b046de5c74b576aaa3a.1553085539.git.paul.chaignon@orange.com> (raw)
In-Reply-To: <cover.1553085539.git.paul.chaignon@orange.com>
This patch adds a test case with an excessive number of call stack frames
in dead code.
Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>
Tested-by: Xiao Han <xiao.han@orange.com>
---
tools/testing/selftests/bpf/verifier/calls.c | 38 ++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/tools/testing/selftests/bpf/verifier/calls.c b/tools/testing/selftests/bpf/verifier/calls.c
index 4004891afa9c..ff147fcda82b 100644
--- a/tools/testing/selftests/bpf/verifier/calls.c
+++ b/tools/testing/selftests/bpf/verifier/calls.c
@@ -907,6 +907,44 @@
.errstr = "call stack",
.result = REJECT,
},
+{
+ "calls: stack depth check in dead code",
+ .insns = {
+ /* main */
+ BPF_MOV64_IMM(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 1), /* call A */
+ BPF_EXIT_INSN(),
+ /* A */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 2), /* call B */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ /* B */
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 1), /* call C */
+ BPF_EXIT_INSN(),
+ /* C */
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 1), /* call D */
+ BPF_EXIT_INSN(),
+ /* D */
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 1), /* call E */
+ BPF_EXIT_INSN(),
+ /* E */
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 1), /* call F */
+ BPF_EXIT_INSN(),
+ /* F */
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 1), /* call G */
+ BPF_EXIT_INSN(),
+ /* G */
+ BPF_RAW_INSN(BPF_JMP|BPF_CALL, 0, 1, 0, 1), /* call H */
+ BPF_EXIT_INSN(),
+ /* H */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_XDP,
+ .errstr = "call stack",
+ .result = REJECT,
+},
{
"calls: spill into caller stack frame",
.insns = {
--
2.17.1
next prev parent reply other threads:[~2019-03-20 12:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-20 12:57 [PATCH bpf-next 0/2] bpf: remove incorrect 'verifier bug' warning Paul Chaignon
2019-03-20 12:58 ` [PATCH bpf-next 1/2] " Paul Chaignon
2019-03-20 12:58 ` Paul Chaignon [this message]
2019-03-20 23:31 ` [PATCH bpf-next 0/2] " Yonghong Song
2019-03-21 9:33 ` Paul Chaignon
2019-03-26 20:07 ` Alexei Starovoitov
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