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lib/test_bpf: Add test to check for result of 32-bit add that overflows 

BPF_ALU32 and BPF_ALU64 tests for adding two 32-bit values that results in
32-bit overflow.

Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Naveen N. Rao 2016-04-05 15:32:55 +05:30 committed by David S. Miller
parent c7395d6bd7
commit b64b50eac4
1 changed files with 64 additions and 0 deletions
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64
lib/test_bpf.c
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@ -2443,6 +2443,22 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 4294967295U } },
},
{
"ALU_ADD_X: 2 + 4294967294 = 0",
.u.insns_int = {
BPF_LD_IMM64(R0, 2),
BPF_LD_IMM64(R1, 4294967294U),
BPF_ALU32_REG(BPF_ADD, R0, R1),
BPF_JMP_IMM(BPF_JEQ, R0, 0, 2),
BPF_ALU32_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
{
"ALU64_ADD_X: 1 + 2 = 3",
.u.insns_int = {
@ -2467,6 +2483,23 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 4294967295U } },
},
{
"ALU64_ADD_X: 2 + 4294967294 = 4294967296",
.u.insns_int = {
BPF_LD_IMM64(R0, 2),
BPF_LD_IMM64(R1, 4294967294U),
BPF_LD_IMM64(R2, 4294967296ULL),
BPF_ALU64_REG(BPF_ADD, R0, R1),
BPF_JMP_REG(BPF_JEQ, R0, R2, 2),
BPF_MOV32_IMM(R0, 0),
BPF_EXIT_INSN(),
BPF_MOV32_IMM(R0, 1),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
/* BPF_ALU | BPF_ADD | BPF_K */
{
"ALU_ADD_K: 1 + 2 = 3",
@ -2501,6 +2534,21 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 4294967295U } },
},
{
"ALU_ADD_K: 4294967294 + 2 = 0",
.u.insns_int = {
BPF_LD_IMM64(R0, 4294967294U),
BPF_ALU32_IMM(BPF_ADD, R0, 2),
BPF_JMP_IMM(BPF_JEQ, R0, 0, 2),
BPF_ALU32_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
{
"ALU_ADD_K: 0 + (-1) = 0x00000000ffffffff",
.u.insns_int = {
@ -2550,6 +2598,22 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 2147483647 } },
},
{
"ALU64_ADD_K: 4294967294 + 2 = 4294967296",
.u.insns_int = {
BPF_LD_IMM64(R0, 4294967294U),
BPF_LD_IMM64(R1, 4294967296ULL),
BPF_ALU64_IMM(BPF_ADD, R0, 2),
BPF_JMP_REG(BPF_JEQ, R0, R1, 2),
BPF_ALU32_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
BPF_ALU32_IMM(BPF_MOV, R0, 1),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
{
"ALU64_ADD_K: 2147483646 + -2147483647 = -1",
.u.insns_int = {