netdev - [PATCH v2] selftests/bpf: Fix test_verifier after introducing resolve_pseudo

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Date:   Tue,  6 Oct 2020 18:23:13 -0700
From:   Hao Luo <haoluo@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, Hao Luo <haoluo@...gle.com>
Subject: [PATCH v2] selftests/bpf: Fix test_verifier after introducing resolve_pseudo_ldimm64

Commit 4976b718c355 ("bpf: Introduce pseudo_btf_id") switched
the order of check_subprogs() and resolve_pseudo_ldimm() in
the verifier. Now an empty prog expects to see the error "last
insn is not an the prog of a single invalid ldimm exit or jmp"
instead, because the check for subprogs comes first. It's now
pointless to validate that half of ldimm64 won't be the last
instruction.

Tested:
 # ./test_verifier
 Summary: 1129 PASSED, 537 SKIPPED, 0 FAILED
 and the full set of bpf selftests.

Fixes: 4976b718c355 ("bpf: Introduce pseudo_btf_id")
Signed-off-by: Hao Luo <haoluo@...gle.com>
---
Changelog in v2:
 - Remove the original test_verifier ld_imm64 test4
 - Updated commit message.

 tools/testing/selftests/bpf/verifier/basic.c  |  2 +-
 .../testing/selftests/bpf/verifier/ld_imm64.c | 24 +++++++------------
 2 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/tools/testing/selftests/bpf/verifier/basic.c b/tools/testing/selftests/bpf/verifier/basic.c
index b8d18642653a..de84f0d57082 100644
--- a/tools/testing/selftests/bpf/verifier/basic.c
+++ b/tools/testing/selftests/bpf/verifier/basic.c
@@ -2,7 +2,7 @@
 	"empty prog",
 	.insns = {
 	},
-	.errstr = "unknown opcode 00",
+	.errstr = "last insn is not an exit or jmp",
 	.result = REJECT,
 },
 {
diff --git a/tools/testing/selftests/bpf/verifier/ld_imm64.c b/tools/testing/selftests/bpf/verifier/ld_imm64.c
index 3856dba733e9..ed6a34991216 100644
--- a/tools/testing/selftests/bpf/verifier/ld_imm64.c
+++ b/tools/testing/selftests/bpf/verifier/ld_imm64.c
@@ -54,21 +54,13 @@
 	"test5 ld_imm64",
 	.insns = {
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, 0, 0, 0),
-	},
-	.errstr = "invalid bpf_ld_imm64 insn",
-	.result = REJECT,
-},
-{
-	"test6 ld_imm64",
-	.insns = {
-	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, 0, 0, 0),
 	BPF_RAW_INSN(0, 0, 0, 0, 0),
 	BPF_EXIT_INSN(),
 	},
 	.result = ACCEPT,
 },
 {
-	"test7 ld_imm64",
+	"test6 ld_imm64",
 	.insns = {
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, 0, 0, 1),
 	BPF_RAW_INSN(0, 0, 0, 0, 1),
@@ -78,7 +70,7 @@
 	.retval = 1,
 },
 {
-	"test8 ld_imm64",
+	"test7 ld_imm64",
 	.insns = {
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, 0, 1, 1),
 	BPF_RAW_INSN(0, 0, 0, 0, 1),
@@ -88,7 +80,7 @@
 	.result = REJECT,
 },
 {
-	"test9 ld_imm64",
+	"test8 ld_imm64",
 	.insns = {
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, 0, 0, 1),
 	BPF_RAW_INSN(0, 0, 0, 1, 1),
@@ -98,7 +90,7 @@
 	.result = REJECT,
 },
 {
-	"test10 ld_imm64",
+	"test9 ld_imm64",
 	.insns = {
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, 0, 0, 1),
 	BPF_RAW_INSN(0, BPF_REG_1, 0, 0, 1),
@@ -108,7 +100,7 @@
 	.result = REJECT,
 },
 {
-	"test11 ld_imm64",
+	"test10 ld_imm64",
 	.insns = {
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, 0, 0, 1),
 	BPF_RAW_INSN(0, 0, BPF_REG_1, 0, 1),
@@ -118,7 +110,7 @@
 	.result = REJECT,
 },
 {
-	"test12 ld_imm64",
+	"test11 ld_imm64",
 	.insns = {
 	BPF_MOV64_IMM(BPF_REG_1, 0),
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, BPF_REG_1, 0, 1),
@@ -129,7 +121,7 @@
 	.result = REJECT,
 },
 {
-	"test13 ld_imm64",
+	"test12 ld_imm64",
 	.insns = {
 	BPF_MOV64_IMM(BPF_REG_1, 0),
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, 0, BPF_REG_1, 0, 1),
@@ -140,7 +132,7 @@
 	.result = REJECT,
 },
 {
-	"test14 ld_imm64: reject 2nd imm != 0",
+	"test13 ld_imm64: reject 2nd imm != 0",
 	.insns = {
 	BPF_MOV64_IMM(BPF_REG_0, 0),
 	BPF_RAW_INSN(BPF_LD | BPF_IMM | BPF_DW, BPF_REG_1,
-- 
2.28.0.806.g8561365e88-goog