824 lines
24 KiB
C
824 lines
24 KiB
C
{
|
|
"reference tracking: leak potential reference",
|
|
.insns = {
|
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BPF_SK_LOOKUP(sk_lookup_tcp),
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|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), /* leak reference */
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|
BPF_EXIT_INSN(),
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|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "Unreleased reference",
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|
.result = REJECT,
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|
},
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|
{
|
|
"reference tracking: leak potential reference to sock_common",
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|
.insns = {
|
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BPF_SK_LOOKUP(skc_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), /* leak reference */
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BPF_EXIT_INSN(),
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|
},
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|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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|
.errstr = "Unreleased reference",
|
|
.result = REJECT,
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|
},
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|
{
|
|
"reference tracking: leak potential reference on stack",
|
|
.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
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|
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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|
},
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|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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|
.errstr = "Unreleased reference",
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|
.result = REJECT,
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|
},
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|
{
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|
"reference tracking: leak potential reference on stack 2",
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|
.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
|
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BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
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BPF_EXIT_INSN(),
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|
},
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|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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|
.errstr = "Unreleased reference",
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|
.result = REJECT,
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|
},
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|
{
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|
"reference tracking: zero potential reference",
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|
.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_IMM(BPF_REG_0, 0), /* leak reference */
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BPF_EXIT_INSN(),
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},
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|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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|
.errstr = "Unreleased reference",
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.result = REJECT,
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|
},
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|
{
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|
"reference tracking: zero potential reference to sock_common",
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|
.insns = {
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BPF_SK_LOOKUP(skc_lookup_tcp),
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BPF_MOV64_IMM(BPF_REG_0, 0), /* leak reference */
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BPF_EXIT_INSN(),
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|
},
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|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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},
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{
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"reference tracking: copy and zero potential references",
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.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_MOV64_IMM(BPF_REG_7, 0), /* leak reference */
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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|
.result = REJECT,
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},
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|
{
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"reference tracking: release reference without check",
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|
.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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/* reference in r0 may be NULL */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "type=sock_or_null expected=sock",
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.result = REJECT,
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|
},
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|
{
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"reference tracking: release reference to sock_common without check",
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.insns = {
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BPF_SK_LOOKUP(skc_lookup_tcp),
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/* reference in r0 may be NULL */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "type=sock_common_or_null expected=sock",
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.result = REJECT,
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},
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{
|
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"reference tracking: release reference",
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|
.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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|
},
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{
|
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"reference tracking: release reference to sock_common",
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|
.insns = {
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BPF_SK_LOOKUP(skc_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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},
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{
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"reference tracking: release reference 2",
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.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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},
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{
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"reference tracking: release reference twice",
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.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "type=inv expected=sock",
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.result = REJECT,
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},
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{
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"reference tracking: release reference twice inside branch",
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.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3), /* goto end */
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "type=inv expected=sock",
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.result = REJECT,
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},
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{
|
|
"reference tracking: alloc, check, free in one subbranch",
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|
.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 16),
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/* if (offsetof(skb, mark) > data_len) exit; */
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BPF_JMP_REG(BPF_JLE, BPF_REG_0, BPF_REG_3, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_2,
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offsetof(struct __sk_buff, mark)),
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 1), /* mark == 0? */
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/* Leak reference in R0 */
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.errstr = "Unreleased reference",
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.result = REJECT,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"reference tracking: alloc, check, free in both subbranches",
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.insns = {
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
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offsetof(struct __sk_buff, data)),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
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offsetof(struct __sk_buff, data_end)),
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 16),
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/* if (offsetof(skb, mark) > data_len) exit; */
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BPF_JMP_REG(BPF_JLE, BPF_REG_0, BPF_REG_3, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_2,
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offsetof(struct __sk_buff, mark)),
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 4), /* mark == 0? */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
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},
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{
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"reference tracking in call: free reference in subprog",
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.insns = {
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BPF_SK_LOOKUP(sk_lookup_tcp),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), /* unchecked reference */
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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/* subprog 1 */
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 0, 1),
|
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
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BPF_EXIT_INSN(),
|
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},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
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"reference tracking in call: free reference in subprog and outside",
|
|
.insns = {
|
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BPF_SK_LOOKUP(sk_lookup_tcp),
|
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), /* unchecked reference */
|
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
|
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
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BPF_EXIT_INSN(),
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|
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/* subprog 1 */
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
|
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 0, 1),
|
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BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "type=inv expected=sock",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking in call: alloc & leak reference in subprog",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
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BPF_EXIT_INSN(),
|
|
|
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/* subprog 1 */
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_4),
|
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BPF_SK_LOOKUP(sk_lookup_tcp),
|
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/* spill unchecked sk_ptr into stack of caller */
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "Unreleased reference",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking in call: alloc in subprog, release outside",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
|
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
|
|
/* subprog 1 */
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_EXIT_INSN(), /* return sk */
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.retval = POINTER_VALUE,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking in call: sk_ptr leak into caller stack",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
|
|
/* subprog 1 */
|
|
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_4, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 5),
|
|
/* spill unchecked sk_ptr into stack of caller */
|
|
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_5, 0),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
|
|
/* subprog 2 */
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "Unreleased reference",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking in call: sk_ptr spill into caller stack",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
|
|
/* subprog 1 */
|
|
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_4, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 8),
|
|
/* spill unchecked sk_ptr into stack of caller */
|
|
BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, -8),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_5, 0),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
|
|
/* now the sk_ptr is verified, free the reference */
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_4, 0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
|
|
/* subprog 2 */
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking: allow LD_ABS",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LD_ABS(BPF_B, 0),
|
|
BPF_LD_ABS(BPF_H, 0),
|
|
BPF_LD_ABS(BPF_W, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking: forbid LD_ABS while holding reference",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_LD_ABS(BPF_B, 0),
|
|
BPF_LD_ABS(BPF_H, 0),
|
|
BPF_LD_ABS(BPF_W, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "BPF_LD_[ABS|IND] cannot be mixed with socket references",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: allow LD_IND",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_MOV64_IMM(BPF_REG_7, 1),
|
|
BPF_LD_IND(BPF_W, BPF_REG_7, -0x200000),
|
|
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
.retval = 1,
|
|
},
|
|
{
|
|
"reference tracking: forbid LD_IND while holding reference",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),
|
|
BPF_MOV64_IMM(BPF_REG_7, 1),
|
|
BPF_LD_IND(BPF_W, BPF_REG_7, -0x200000),
|
|
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_4),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "BPF_LD_[ABS|IND] cannot be mixed with socket references",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: check reference or tail call",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
/* if (sk) bpf_sk_release() */
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 7),
|
|
/* bpf_tail_call() */
|
|
BPF_MOV64_IMM(BPF_REG_3, 2),
|
|
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_tail_call),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_prog1 = { 17 },
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking: release reference then tail call",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
/* if (sk) bpf_sk_release() */
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
/* bpf_tail_call() */
|
|
BPF_MOV64_IMM(BPF_REG_3, 2),
|
|
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_tail_call),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_prog1 = { 18 },
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking: leak possible reference over tail call",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
|
/* Look up socket and store in REG_6 */
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
/* bpf_tail_call() */
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_IMM(BPF_REG_3, 2),
|
|
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_tail_call),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
/* if (sk) bpf_sk_release() */
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_prog1 = { 16 },
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "tail_call would lead to reference leak",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: leak checked reference over tail call",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_1),
|
|
/* Look up socket and store in REG_6 */
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
/* if (!sk) goto end */
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
|
|
/* bpf_tail_call() */
|
|
BPF_MOV64_IMM(BPF_REG_3, 0),
|
|
BPF_LD_MAP_FD(BPF_REG_2, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_tail_call),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_prog1 = { 17 },
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "tail_call would lead to reference leak",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: mangle and release sock_or_null",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 5),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "R1 pointer arithmetic on sock_or_null prohibited",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: mangle and release sock",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 5),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "R1 pointer arithmetic on sock prohibited",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: access member",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_0, 4),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking: write to member",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_LD_IMM64(BPF_REG_2, 42),
|
|
BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_2,
|
|
offsetof(struct bpf_sock, mark)),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LD_IMM64(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "cannot write into sock",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: invalid 64-bit access of member",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "invalid sock access off=0 size=8",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: access after release",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.errstr = "!read_ok",
|
|
.result = REJECT,
|
|
},
|
|
{
|
|
"reference tracking: direct access for lookup",
|
|
.insns = {
|
|
/* Check that the packet is at least 64B long */
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
|
offsetof(struct __sk_buff, data)),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
|
offsetof(struct __sk_buff, data_end)),
|
|
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 64),
|
|
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 9),
|
|
/* sk = sk_lookup_tcp(ctx, skb->data, ...) */
|
|
BPF_MOV64_IMM(BPF_REG_3, sizeof(struct bpf_sock_tuple)),
|
|
BPF_MOV64_IMM(BPF_REG_4, 0),
|
|
BPF_MOV64_IMM(BPF_REG_5, 0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_lookup_tcp),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_0, 4),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking: use ptr from bpf_tcp_sock() after release",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_tcp_sock),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_7, offsetof(struct bpf_tcp_sock, snd_cwnd)),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "invalid mem access",
|
|
},
|
|
{
|
|
"reference tracking: use ptr from bpf_sk_fullsock() after release",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_fullsock),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_7, offsetof(struct bpf_sock, type)),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "invalid mem access",
|
|
},
|
|
{
|
|
"reference tracking: use ptr from bpf_sk_fullsock(tp) after release",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_tcp_sock),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_fullsock),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_6, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, offsetof(struct bpf_sock, type)),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "invalid mem access",
|
|
},
|
|
{
|
|
"reference tracking: use sk after bpf_sk_release(tp)",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_tcp_sock),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, offsetof(struct bpf_sock, type)),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "invalid mem access",
|
|
},
|
|
{
|
|
"reference tracking: use ptr from bpf_get_listener_sock() after bpf_sk_release(sk)",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_get_listener_sock),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, offsetof(struct bpf_sock, src_port)),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"reference tracking: bpf_sk_release(listen_sk)",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_get_listener_sock),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, offsetof(struct bpf_sock, type)),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "reference has not been acquired before",
|
|
},
|
|
{
|
|
/* !bpf_sk_fullsock(sk) is checked but !bpf_tcp_sock(sk) is not checked */
|
|
"reference tracking: tp->snd_cwnd after bpf_sk_fullsock(sk) and bpf_tcp_sock(sk)",
|
|
.insns = {
|
|
BPF_SK_LOOKUP(sk_lookup_tcp),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_fullsock),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_tcp_sock),
|
|
BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0, 3),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_8, offsetof(struct bpf_tcp_sock, snd_cwnd)),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_EMIT_CALL(BPF_FUNC_sk_release),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "invalid mem access",
|
|
},
|