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bpf: add couple of test cases for signed extended imms

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Add a couple of test cases for interpreter and JIT that are
related to an issue we faced some time ago in Cilium [1],
which is fixed in LLVM with commit e53750e1e086 ("bpf: fix
bug on silently truncating 64-bit immediate").

Test cases were run-time checking kernel to behave as intended
which should also provide some guidance for current or new
JITs in case they should trip over this. Added for cBPF and
eBPF.

  [1] https://github.com/cilium/cilium/pull/2162

Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
This commit is contained in:
Daniel Borkmann 2018-01-20 01:24:31 +01:00 • committed by Alexei Starovoitov
commit fcd1c91771
1 changed files with 104 additions and 0 deletions
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104
lib/test_bpf.c
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@ -6109,6 +6109,110 @@ static struct bpf_test tests[] = {
{ { ETH_HLEN, 42 } },
.fill_helper = bpf_fill_ld_abs_vlan_push_pop2,
},
/* Checking interpreter vs JIT wrt signed extended imms. */
{
"JNE signed compare, test 1",
.u.insns_int = {
BPF_ALU32_IMM(BPF_MOV, R1, 0xfefbbc12),
BPF_ALU32_IMM(BPF_MOV, R3, 0xffff0000),
BPF_MOV64_REG(R2, R1),
BPF_ALU64_REG(BPF_AND, R2, R3),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_JMP_IMM(BPF_JNE, R2, -17104896, 1),
BPF_ALU32_IMM(BPF_MOV, R0, 2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
{
"JNE signed compare, test 2",
.u.insns_int = {
BPF_ALU32_IMM(BPF_MOV, R1, 0xfefbbc12),
BPF_ALU32_IMM(BPF_MOV, R3, 0xffff0000),
BPF_MOV64_REG(R2, R1),
BPF_ALU64_REG(BPF_AND, R2, R3),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_JMP_IMM(BPF_JNE, R2, 0xfefb0000, 1),
BPF_ALU32_IMM(BPF_MOV, R0, 2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
{
"JNE signed compare, test 3",
.u.insns_int = {
BPF_ALU32_IMM(BPF_MOV, R1, 0xfefbbc12),
BPF_ALU32_IMM(BPF_MOV, R3, 0xffff0000),
BPF_ALU32_IMM(BPF_MOV, R4, 0xfefb0000),
BPF_MOV64_REG(R2, R1),
BPF_ALU64_REG(BPF_AND, R2, R3),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_JMP_REG(BPF_JNE, R2, R4, 1),
BPF_ALU32_IMM(BPF_MOV, R0, 2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 2 } },
},
{
"JNE signed compare, test 4",
.u.insns_int = {
BPF_LD_IMM64(R1, -17104896),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_JMP_IMM(BPF_JNE, R1, -17104896, 1),
BPF_ALU32_IMM(BPF_MOV, R0, 2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 2 } },
},
{
"JNE signed compare, test 5",
.u.insns_int = {
BPF_LD_IMM64(R1, 0xfefb0000),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_JMP_IMM(BPF_JNE, R1, 0xfefb0000, 1),
BPF_ALU32_IMM(BPF_MOV, R0, 2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
{
"JNE signed compare, test 6",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x7efb0000),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_JMP_IMM(BPF_JNE, R1, 0x7efb0000, 1),
BPF_ALU32_IMM(BPF_MOV, R0, 2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 2 } },
},
{
"JNE signed compare, test 7",
.u.insns = {
BPF_STMT(BPF_LD | BPF_IMM, 0xffff0000),
BPF_STMT(BPF_MISC | BPF_TAX, 0),
BPF_STMT(BPF_LD | BPF_IMM, 0xfefbbc12),
BPF_STMT(BPF_ALU | BPF_AND | BPF_X, 0),
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0xfefb0000, 1, 0),
BPF_STMT(BPF_RET | BPF_K, 1),
BPF_STMT(BPF_RET | BPF_K, 2),
},
CLASSIC | FLAG_NO_DATA,
{},
{ { 0, 2 } },
},
};
static struct net_device dev;