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linux-stable/tools/testing/selftests/bpf/verifier/stack_ptr.c
Daniel Borkmann 1bad6fd52b bpf, selftests: Adjust few selftest result_unpriv outcomes 
Given we don't need to simulate the speculative domain for registers with
immediates anymore since the verifier uses direct imm-based rewrites instead
of having to mask, we can also lift a few cases that were previously rejected.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
2021-05-25 22:08:53 +02:00

359 lines
9.6 KiB
C
Raw Blame History

{
"PTR_TO_STACK store/load",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -10),
BPF_ST_MEM(BPF_DW, BPF_REG_1, 2, 0xfaceb00c),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 2),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0xfaceb00c,
},
{
"PTR_TO_STACK store/load - bad alignment on off",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_ST_MEM(BPF_DW, BPF_REG_1, 2, 0xfaceb00c),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 2),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "misaligned stack access off (0x0; 0x0)+-8+2 size 8",
},
{
"PTR_TO_STACK store/load - bad alignment on reg",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -10),
BPF_ST_MEM(BPF_DW, BPF_REG_1, 8, 0xfaceb00c),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 8),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "misaligned stack access off (0x0; 0x0)+-10+8 size 8",
},
{
"PTR_TO_STACK store/load - out of bounds low",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -80000),
BPF_ST_MEM(BPF_DW, BPF_REG_1, 8, 0xfaceb00c),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 8),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "invalid write to stack R1 off=-79992 size=8",
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
},
{
"PTR_TO_STACK store/load - out of bounds high",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_ST_MEM(BPF_DW, BPF_REG_1, 8, 0xfaceb00c),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 8),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "invalid write to stack R1 off=0 size=8",
},
{
"PTR_TO_STACK check high 1",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -1),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 42,
},
{
"PTR_TO_STACK check high 2",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ST_MEM(BPF_B, BPF_REG_1, -1, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, -1),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 42,
},
{
"PTR_TO_STACK check high 3",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0),
BPF_ST_MEM(BPF_B, BPF_REG_1, -1, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, -1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.result_unpriv = REJECT,
.result = ACCEPT,
.retval = 42,
},
{
"PTR_TO_STACK check high 4",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.errstr = "invalid write to stack R1 off=0 size=1",
.result = REJECT,
},
{
"PTR_TO_STACK check high 5",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, (1 << 29) - 1),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.errstr = "invalid write to stack R1",
},
{
"PTR_TO_STACK check high 6",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, (1 << 29) - 1),
BPF_ST_MEM(BPF_B, BPF_REG_1, SHRT_MAX, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, SHRT_MAX),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.errstr = "invalid write to stack",
},
{
"PTR_TO_STACK check high 7",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, (1 << 29) - 1),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, (1 << 29) - 1),
BPF_ST_MEM(BPF_B, BPF_REG_1, SHRT_MAX, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, SHRT_MAX),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.errstr = "fp pointer offset",
},
{
"PTR_TO_STACK check low 1",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -512),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 42,
},
{
"PTR_TO_STACK check low 2",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -513),
BPF_ST_MEM(BPF_B, BPF_REG_1, 1, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 1),
BPF_EXIT_INSN(),
},
.result_unpriv = REJECT,
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.result = ACCEPT,
.retval = 42,
},
{
"PTR_TO_STACK check low 3",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -513),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.errstr = "invalid write to stack R1 off=-513 size=1",
.result = REJECT,
},
{
"PTR_TO_STACK check low 4",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, INT_MIN),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "math between fp pointer",
},
{
"PTR_TO_STACK check low 5",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -((1 << 29) - 1)),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.errstr = "invalid write to stack",
},
{
"PTR_TO_STACK check low 6",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -((1 << 29) - 1)),
BPF_ST_MEM(BPF_B, BPF_REG_1, SHRT_MIN, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, SHRT_MIN),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "invalid write to stack",
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
},
{
"PTR_TO_STACK check low 7",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -((1 << 29) - 1)),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -((1 << 29) - 1)),
BPF_ST_MEM(BPF_B, BPF_REG_1, SHRT_MIN, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, SHRT_MIN),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr_unpriv = "R1 stack pointer arithmetic goes out of range",
.errstr = "fp pointer offset",
},
{
"PTR_TO_STACK mixed reg/k, 1",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -3),
BPF_MOV64_IMM(BPF_REG_2, -3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_2),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 42,
},
{
"PTR_TO_STACK mixed reg/k, 2",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -3),
BPF_MOV64_IMM(BPF_REG_2, -3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_2),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_5, -6),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 42,
},
{
"PTR_TO_STACK mixed reg/k, 3",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -3),
BPF_MOV64_IMM(BPF_REG_2, -3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_2),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = -3,
},
{
"PTR_TO_STACK reg",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_MOV64_IMM(BPF_REG_2, -3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_2),
BPF_ST_MEM(BPF_B, BPF_REG_1, 0, 42),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 42,
},
{
"stack pointer arithmetic",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, 4),
BPF_JMP_IMM(BPF_JA, 0, 0, 0),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -10),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1),
BPF_ST_MEM(0, BPF_REG_2, 4, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, 8),
BPF_ST_MEM(0, BPF_REG_2, 4, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
},
{
"store PTR_TO_STACK in R10 to array map using BPF_B",
.insns = {
/* Load pointer to map. */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 2),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
/* Copy R10 to R9. */
BPF_MOV64_REG(BPF_REG_9, BPF_REG_10),
/* Pollute other registers with unaligned values. */
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_MOV64_IMM(BPF_REG_3, -1),
BPF_MOV64_IMM(BPF_REG_4, -1),
BPF_MOV64_IMM(BPF_REG_5, -1),
BPF_MOV64_IMM(BPF_REG_6, -1),
BPF_MOV64_IMM(BPF_REG_7, -1),
BPF_MOV64_IMM(BPF_REG_8, -1),
/* Store both R9 and R10 with BPF_B and read back. */
BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, 0),
BPF_LDX_MEM(BPF_B, BPF_REG_2, BPF_REG_1, 0),
BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_9, 0),
BPF_LDX_MEM(BPF_B, BPF_REG_3, BPF_REG_1, 0),
/* Should read back as same value. */
BPF_JMP_REG(BPF_JEQ, BPF_REG_2, BPF_REG_3, 2),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 42),
BPF_EXIT_INSN(),
},
.fixup_map_array_48b = { 3 },
.result = ACCEPT,
.retval = 42,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
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