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selftests/bpf: add basic verifier tests for loops 

This set of tests is a rewrite of Edward's earlier tests:
https://patchwork.ozlabs.org/patch/877221/

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov 2019-06-15 12:12:23 -07:00 committed by Daniel Borkmann
parent aeee380ccf
commit 0d3679e99a
1 changed files with 161 additions and 0 deletions
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161
tools/testing/selftests/bpf/verifier/loops1.c Normal file
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{
"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, 3),
BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 20, -2),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
{
"bounded loop, count from positive unknown to 4",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
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(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.retval = 4,
},
{
"bounded loop, count from totally unknown to 4",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
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,
},
{
"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 = ACCEPT,
.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 = REJECT,
.errstr = "back-edge",
.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_IMM(BPF_REG_6, 0),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),
BPF_JMP_IMM(BPF_JGT, BPF_REG_6, 10000, 2),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
BPF_JMP_A(-4),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.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 = "program is too large",
.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 = "back-edge",
.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 detected",
.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 detected",
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},