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Commit caaaa166 authored by Johan Almbladh's avatar Johan Almbladh Committed by Daniel Borkmann
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bpf/tests: Add tests of BPF_LDX and BPF_STX with small sizes 

This patch adds a series of tests to verify the behavior of BPF_LDX and
BPF_STX with BPF_B//W sizes in isolation. In particular, it checks that
BPF_LDX zero-extendeds the result, and that BPF_STX does not overwrite
adjacent bytes in memory.

BPF_ST and operations on BPF_DW size are deemed to be sufficiently
tested by existing tests.
Signed-off-by: default avatarJohan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211001130348.3670534-2-johan.almbladh@anyfinetworks.com
parent 6bbc7103
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lib/test_bpf.c
View file @ caaaa166
......@@ -6907,6 +6907,260 @@ static struct bpf_test tests[] = {
{ },
{ { 0, (u32) (cpu_to_le64(0xfedcba9876543210ULL) >> 32) } },
},
/* BPF_LDX_MEM B/H/W/DW */
{
"BPF_LDX_MEM | BPF_B",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0102030405060708ULL),
BPF_LD_IMM64(R2, 0x0000000000000008ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_LDX_MEM(BPF_B, R0, R10, -1),
#else
BPF_LDX_MEM(BPF_B, R0, R10, -8),
#endif
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_LDX_MEM | BPF_B, MSB set",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8182838485868788ULL),
BPF_LD_IMM64(R2, 0x0000000000000088ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_LDX_MEM(BPF_B, R0, R10, -1),
#else
BPF_LDX_MEM(BPF_B, R0, R10, -8),
#endif
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_LDX_MEM | BPF_H",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0102030405060708ULL),
BPF_LD_IMM64(R2, 0x0000000000000708ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_LDX_MEM(BPF_H, R0, R10, -2),
#else
BPF_LDX_MEM(BPF_H, R0, R10, -8),
#endif
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_LDX_MEM | BPF_H, MSB set",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8182838485868788ULL),
BPF_LD_IMM64(R2, 0x0000000000008788ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_LDX_MEM(BPF_H, R0, R10, -2),
#else
BPF_LDX_MEM(BPF_H, R0, R10, -8),
#endif
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_LDX_MEM | BPF_W",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0102030405060708ULL),
BPF_LD_IMM64(R2, 0x0000000005060708ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_LDX_MEM(BPF_W, R0, R10, -4),
#else
BPF_LDX_MEM(BPF_W, R0, R10, -8),
#endif
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_LDX_MEM | BPF_W, MSB set",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8182838485868788ULL),
BPF_LD_IMM64(R2, 0x0000000085868788ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_LDX_MEM(BPF_W, R0, R10, -4),
#else
BPF_LDX_MEM(BPF_W, R0, R10, -8),
#endif
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
/* BPF_STX_MEM B/H/W/DW */
{
"BPF_STX_MEM | BPF_B",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8090a0b0c0d0e0f0ULL),
BPF_LD_IMM64(R2, 0x0102030405060708ULL),
BPF_LD_IMM64(R3, 0x8090a0b0c0d0e008ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_STX_MEM(BPF_B, R10, R2, -1),
#else
BPF_STX_MEM(BPF_B, R10, R2, -8),
#endif
BPF_LDX_MEM(BPF_DW, R0, R10, -8),
BPF_JMP_REG(BPF_JNE, R0, R3, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_STX_MEM | BPF_B, MSB set",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8090a0b0c0d0e0f0ULL),
BPF_LD_IMM64(R2, 0x8182838485868788ULL),
BPF_LD_IMM64(R3, 0x8090a0b0c0d0e088ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_STX_MEM(BPF_B, R10, R2, -1),
#else
BPF_STX_MEM(BPF_B, R10, R2, -8),
#endif
BPF_LDX_MEM(BPF_DW, R0, R10, -8),
BPF_JMP_REG(BPF_JNE, R0, R3, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_STX_MEM | BPF_H",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8090a0b0c0d0e0f0ULL),
BPF_LD_IMM64(R2, 0x0102030405060708ULL),
BPF_LD_IMM64(R3, 0x8090a0b0c0d00708ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_STX_MEM(BPF_H, R10, R2, -2),
#else
BPF_STX_MEM(BPF_H, R10, R2, -8),
#endif
BPF_LDX_MEM(BPF_DW, R0, R10, -8),
BPF_JMP_REG(BPF_JNE, R0, R3, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_STX_MEM | BPF_H, MSB set",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8090a0b0c0d0e0f0ULL),
BPF_LD_IMM64(R2, 0x8182838485868788ULL),
BPF_LD_IMM64(R3, 0x8090a0b0c0d08788ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_STX_MEM(BPF_H, R10, R2, -2),
#else
BPF_STX_MEM(BPF_H, R10, R2, -8),
#endif
BPF_LDX_MEM(BPF_DW, R0, R10, -8),
BPF_JMP_REG(BPF_JNE, R0, R3, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_STX_MEM | BPF_W",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8090a0b0c0d0e0f0ULL),
BPF_LD_IMM64(R2, 0x0102030405060708ULL),
BPF_LD_IMM64(R3, 0x8090a0b005060708ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_STX_MEM(BPF_W, R10, R2, -4),
#else
BPF_STX_MEM(BPF_W, R10, R2, -8),
#endif
BPF_LDX_MEM(BPF_DW, R0, R10, -8),
BPF_JMP_REG(BPF_JNE, R0, R3, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
{
"BPF_STX_MEM | BPF_W, MSB set",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x8090a0b0c0d0e0f0ULL),
BPF_LD_IMM64(R2, 0x8182838485868788ULL),
BPF_LD_IMM64(R3, 0x8090a0b085868788ULL),
BPF_STX_MEM(BPF_DW, R10, R1, -8),
#ifdef __BIG_ENDIAN
BPF_STX_MEM(BPF_W, R10, R2, -4),
#else
BPF_STX_MEM(BPF_W, R10, R2, -8),
#endif
BPF_LDX_MEM(BPF_DW, R0, R10, -8),
BPF_JMP_REG(BPF_JNE, R0, R3, 1),
BPF_ALU64_IMM(BPF_MOV, R0, 0),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 8,
},
/* BPF_ST(X) | BPF_MEM | BPF_B/H/W/DW */
{
"ST_MEM_B: Store/Load byte: max negative",
......
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