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Message-ID: <a60142bf-7da7-29be-340f-2e06b0d3cbc0@solarflare.com>
Date: Fri, 23 Feb 2018 17:41:36 +0000
From: Edward Cree <ecree@...arflare.com>
To: netdev <netdev@...r.kernel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>
Subject: [RFC PATCH bpf-next 08/12] bpf/verifier: selftests for bounded loops
Mainly consists of tests that broke (or I expected to break) earlier
versions of the bounded-loop handling.
Also updated some existing tests to deal with changed error messages,
programs now being accepted etc.
Signed-off-by: Edward Cree <ecree@...arflare.com>
---
tools/testing/selftests/bpf/test_verifier.c | 198 +++++++++++++++++++++++++++-
1 file changed, 191 insertions(+), 7 deletions(-)
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 722a16b2e9c4..fda35a5a0ff9 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -9338,7 +9338,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
- .errstr = "frames is too deep",
+ .errstr = "recursive call",
.result = REJECT,
},
{
@@ -9389,8 +9389,8 @@ static struct bpf_test tests[] = {
BPF_JMP_IMM(BPF_JA, 0, 0, -6),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
- .errstr = "back-edge from insn",
- .result = REJECT,
+ .result = ACCEPT,
+ .retval = 1,
},
{
"calls: conditional call 4",
@@ -9424,8 +9424,8 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
- .errstr = "back-edge from insn",
- .result = REJECT,
+ .result = ACCEPT,
+ .retval = 1,
},
{
"calls: conditional call 6",
@@ -9666,7 +9666,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
- .errstr = "frames is too deep",
+ .errstr = "recursive call",
.result = REJECT,
},
{
@@ -9678,7 +9678,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
- .errstr = "frames is too deep",
+ .errstr = "recursive call",
.result = REJECT,
},
{
@@ -11135,6 +11135,190 @@ static struct bpf_test tests[] = {
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
+ {
+ "bounded loop, count to 4",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ .retval = 4,
+ },
+ {
+ "bounded loop, count to 20",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 20, -2),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "r0 is increasing too slowly",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
+ {
+ "bounded loop, count from positive unknown to 4",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
+ 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_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
+ BPF_JMP_IMM(BPF_JSLT, BPF_REG_0, 0, 2),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_map1 = { 3 },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ .retval = 4,
+ },
+ {
+ "bounded loop, count from totally unknown to 4",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
+ 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, 3),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_map1 = { 3 },
+ .result = REJECT,
+ .errstr = "r0 is not increasing",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
+ {
+ "bounded loop, count to 4 with equality",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, -2),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "loop with this opcode not supported",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
+ {
+ "bounded loop, start in the middle",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_JMP_A(1),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ .retval = 4,
+ },
+ {
+ "bounded loop containing a forward jump",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_0, 0),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -3),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ .retval = 4,
+ },
+ {
+ "bounded loop that jumps out rather than in",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
+ 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_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, 1),
+ BPF_JMP_A(-3),
+ BPF_EXIT_INSN(),
+ },
+ .fixup_map1 = { 3 },
+ .result = REJECT,
+ .errstr = "loop on conditional fallthrough",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
+ {
+ "infinite loop after a conditional jump",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 5),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, 2),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_JMP_A(-2),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "back-edge from insn 3 to 2",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
+ {
+ "bounded recursion",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+ BPF_EXIT_INSN(),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_1, 4, 1),
+ BPF_EXIT_INSN(),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -5),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "recursive call",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
+ {
+ "infinite loop in two jumps",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_JMP_A(0),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "loop variable r0 is not increasing",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
+ {
+ "infinite loop: three-jump trick",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1),
+ BPF_EXIT_INSN(),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1),
+ BPF_EXIT_INSN(),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
+ BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
+ BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, -11),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "loop from insn 11 to 1 ceased to be bounded",
+ .prog_type = BPF_PROG_TYPE_TRACEPOINT,
+ },
};
static int probe_filter_length(const struct bpf_insn *fp)
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