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Date: Sun, 12 Nov 2017 08:04:01 -0800
From: Yonghong Song <yhs@...com>
To: <ast@...com>, <daniel@...earbox.net>, <netdev@...r.kernel.org>
CC: <kernel-team@...com>
Subject: [PATCH net-next 3/3 v2] bpf: fix and add test cases for ARG_CONST_SIZE_OR_ZERO semantics change
Fix a few test cases to allow non-NULL map/packet/stack pointer
with size = 0. Change a few tests using bpf_probe_read to use
bpf_probe_write_user so ARG_CONST_SIZE arg can still be properly
tested. One existing test case already covers size = 0 with non-NULL
packet pointer, so add additional tests so all cases of
size = 0 and 0 <= size <= legal_upper_bound with non-NULL
map/packet/stack pointer are covered.
Signed-off-by: Yonghong Song <yhs@...com>
Acked-by: Alexei Starovoitov <ast@...nel.org>
---
tools/testing/selftests/bpf/test_verifier.c | 131 ++++++++++++++++++++++++----
1 file changed, 112 insertions(+), 19 deletions(-)
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index bb3c4ad..bf092b8 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -3579,7 +3579,7 @@ static struct bpf_test tests[] = {
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
- "helper access to packet: test19, cls helper fail range zero",
+ "helper access to packet: test19, cls helper range zero",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
offsetof(struct __sk_buff, data)),
@@ -3599,8 +3599,7 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
- .result = REJECT,
- .errstr = "invalid access to packet",
+ .result = ACCEPT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
@@ -4379,10 +4378,10 @@ static struct bpf_test tests[] = {
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
- BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
- BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_1, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_read),
+ BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
@@ -4486,9 +4485,10 @@ static struct bpf_test tests[] = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1,
offsetof(struct test_val, foo)),
- BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
+ BPF_MOV64_IMM(BPF_REG_1, 0),
BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_read),
+ BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
@@ -4622,13 +4622,14 @@ static struct bpf_test tests[] = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_3),
- BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
+ BPF_MOV64_IMM(BPF_REG_1, 0),
BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_read),
+ BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
- .errstr = "R1 min value is outside of the array range",
+ .errstr = "R2 min value is outside of the array range",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
@@ -4765,13 +4766,14 @@ static struct bpf_test tests[] = {
BPF_JMP_IMM(BPF_JGT, BPF_REG_3,
offsetof(struct test_val, foo), 4),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_3),
- BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
+ BPF_MOV64_IMM(BPF_REG_1, 0),
BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_read),
+ BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
- .errstr = "R1 min value is outside of the array range",
+ .errstr = "R2 min value is outside of the array range",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
@@ -5350,7 +5352,7 @@ static struct bpf_test tests[] = {
BPF_EMIT_CALL(BPF_FUNC_probe_read),
BPF_EXIT_INSN(),
},
- .errstr = "invalid stack type R1 off=-64 access_size=0",
+ .errstr = "invalid indirect read from stack off -64+0 size 64",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
@@ -5505,7 +5507,7 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
- .errstr = "invalid stack type R1 off=-64 access_size=0",
+ .errstr = "invalid indirect read from stack off -64+0 size 64",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
@@ -5668,7 +5670,7 @@ static struct bpf_test tests[] = {
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
- "helper access to variable memory: size = 0 not allowed on != NULL",
+ "helper access to variable memory: size = 0 allowed on != NULL stack pointer",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
@@ -5681,8 +5683,99 @@ static struct bpf_test tests[] = {
BPF_EMIT_CALL(BPF_FUNC_csum_diff),
BPF_EXIT_INSN(),
},
- .errstr = "invalid stack type R1 off=-8 access_size=0",
- .result = REJECT,
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "helper access to variable memory: size = 0 allowed on != NULL map pointer",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_map_lookup_elem),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_IMM(BPF_REG_4, 0),
+ BPF_MOV64_IMM(BPF_REG_5, 0),
+ BPF_EMIT_CALL(BPF_FUNC_csum_diff),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_map1 = { 3 },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "helper access to variable memory: size possible = 0 allowed on != NULL stack pointer",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_map_lookup_elem),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
+ BPF_JMP_IMM(BPF_JGT, BPF_REG_2, 8, 7),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+ BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_IMM(BPF_REG_4, 0),
+ BPF_MOV64_IMM(BPF_REG_5, 0),
+ BPF_EMIT_CALL(BPF_FUNC_csum_diff),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_map1 = { 3 },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "helper access to variable memory: size possible = 0 allowed on != NULL map pointer",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_map_lookup_elem),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
+ BPF_JMP_IMM(BPF_JGT, BPF_REG_2, 8, 4),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_IMM(BPF_REG_4, 0),
+ BPF_MOV64_IMM(BPF_REG_5, 0),
+ BPF_EMIT_CALL(BPF_FUNC_csum_diff),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_map1 = { 3 },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ },
+ {
+ "helper access to variable memory: size possible = 0 allowed on != NULL packet pointer",
+ .insns = {
+ BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
+ offsetof(struct __sk_buff, data)),
+ BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
+ offsetof(struct __sk_buff, data_end)),
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_6),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
+ BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 7),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6, 0),
+ BPF_JMP_IMM(BPF_JGT, BPF_REG_2, 8, 4),
+ BPF_MOV64_IMM(BPF_REG_3, 0),
+ BPF_MOV64_IMM(BPF_REG_4, 0),
+ BPF_MOV64_IMM(BPF_REG_5, 0),
+ BPF_EMIT_CALL(BPF_FUNC_csum_diff),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
--
2.9.5
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