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bpf: add couple of test cases for div/mod by zero 

Add couple of missing test cases for eBPF div/mod by zero to the
new test_verifier prog runtime feature. Also one for an empty prog
and only exit.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-01-20 01:24:32 +01:00 committed by Alexei Starovoitov
parent fcd1c91771
commit 87c1793b1b
1 changed files with 87 additions and 0 deletions
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87
tools/testing/selftests/bpf/test_verifier.c
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@ -101,6 +101,93 @@ static struct bpf_test tests[] = {
.result = ACCEPT,
.retval = -3,
},
{
"DIV32 by 0, zero check 1",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, 42),
BPF_MOV32_IMM(BPF_REG_1, 0),
BPF_MOV32_IMM(BPF_REG_2, 1),
BPF_ALU32_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0,
},
{
"DIV32 by 0, zero check 2",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, 42),
BPF_LD_IMM64(BPF_REG_1, 0xffffffff00000000LL),
BPF_MOV32_IMM(BPF_REG_2, 1),
BPF_ALU32_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0,
},
{
"DIV64 by 0, zero check",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, 42),
BPF_MOV32_IMM(BPF_REG_1, 0),
BPF_MOV32_IMM(BPF_REG_2, 1),
BPF_ALU64_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0,
},
{
"MOD32 by 0, zero check 1",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, 42),
BPF_MOV32_IMM(BPF_REG_1, 0),
BPF_MOV32_IMM(BPF_REG_2, 1),
BPF_ALU32_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0,
},
{
"MOD32 by 0, zero check 2",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, 42),
BPF_LD_IMM64(BPF_REG_1, 0xffffffff00000000LL),
BPF_MOV32_IMM(BPF_REG_2, 1),
BPF_ALU32_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0,
},
{
"MOD64 by 0, zero check",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, 42),
BPF_MOV32_IMM(BPF_REG_1, 0),
BPF_MOV32_IMM(BPF_REG_2, 1),
BPF_ALU64_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0,
},
{
"empty prog",
.insns = {
},
.errstr = "last insn is not an exit or jmp",
.result = REJECT,
},
{
"only exit insn",
.insns = {
BPF_EXIT_INSN(),
},
.errstr = "R0 !read_ok",
.result = REJECT,
},
{
"unreachable",
.insns = {