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linux-stable/tools/testing/selftests/bpf/verifier/regalloc.c
Björn Töpel 6007b23cc7 selftests/bpf: Mark tests that require unaligned memory access 
A lot of tests require unaligned memory access to work. Mark the tests
as such, so that they can be avoided on unsupported architectures such
as RISC-V.

Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Luke Nelson <luke.r.nels@gmail.com>
Link: https://lore.kernel.org/bpf/20201118071640.83773-4-bjorn.topel@gmail.com
2020-11-18 17:45:35 -08:00

277 lines
9.3 KiB
C
Raw Blame History

{
"regalloc basic",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 20, 4),
BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc negative",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 24, 4),
BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = REJECT,
.errstr = "invalid access to map value, value_size=48 off=48 size=1",
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
{
"regalloc src_reg mark",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 20, 5),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_JMP_REG(BPF_JSGE, BPF_REG_3, BPF_REG_2, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc src_reg negative",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 22, 5),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_JMP_REG(BPF_JSGE, BPF_REG_3, BPF_REG_2, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = REJECT,
.errstr = "invalid access to map value, value_size=48 off=44 size=8",
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc and spill",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 11),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 20, 7),
/* r0 has upper bound that should propagate into r2 */
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8), /* spill r2 */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_2, 0), /* clear r0 and r2 */
BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_10, -8), /* fill r3 */
BPF_JMP_REG(BPF_JSGE, BPF_REG_0, BPF_REG_3, 2),
/* r3 has lower and upper bounds */
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_3),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc and spill negative",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 11),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 48, 7),
/* r0 has upper bound that should propagate into r2 */
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8), /* spill r2 */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_2, 0), /* clear r0 and r2 */
BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_10, -8), /* fill r3 */
BPF_JMP_REG(BPF_JSGE, BPF_REG_0, BPF_REG_3, 2),
/* r3 has lower and upper bounds */
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_3),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = REJECT,
.errstr = "invalid access to map value, value_size=48 off=48 size=8",
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc three regs",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 10),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_2),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_0, 12, 5),
BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 4),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_4),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc after call",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 10),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_9, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_8, 20, 4),
BPF_JMP_IMM(BPF_JSLT, BPF_REG_9, 0, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_8),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_9),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc in callee",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 20, 5),
BPF_JMP_IMM(BPF_JSLT, BPF_REG_2, 0, 4),
BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_1),
BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_2),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"regalloc, spill, JEQ",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8), /* spill r0 */
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 0),
/* The verifier will walk the rest twice with r0 == 0 and r0 == map_value */
BPF_EMIT_CALL(BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 20, 0),
/* The verifier will walk the rest two more times with r0 == 20 and r0 == unknown */
BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_10, -8), /* fill r3 with map_value */
BPF_JMP_IMM(BPF_JEQ, BPF_REG_3, 0, 1), /* skip ldx if map_value == NULL */
/* Buggy verifier will think that r3 == 20 here */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0), /* read from map_value */
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 4 },
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
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