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lkl_linux/tools/testing/selftests/bpf/verifier/ref_tracking.c
Kumar Kartikeya Dwivedi 00b85860fe bpf: Rewrite kfunc argument handling 
As we continue to add more features, argument types, kfunc flags, and
different extensions to kfuncs, the code to verify the correctness of
the kfunc prototype wrt the passed in registers has become ad-hoc and
ugly to read. To make life easier, and make a very clear split between
different stages of argument processing, move all the code into
verifier.c and refactor into easier to read helpers and functions.

This also makes sharing code within the verifier easier with kfunc
argument processing. This will be more and more useful in later patches
as we are now moving to implement very core BPF helpers as kfuncs, to
keep them experimental before baking into UAPI.

Remove all kfunc related bits now from btf_check_func_arg_match, as
users have been converted away to refactored kfunc argument handling.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20221118015614.2013203-12-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2022-11-17 19:16:49 -08:00

1083 lines
31 KiB
C
Raw Blame History

{
"reference tracking: leak potential reference",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), /* leak reference */
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: leak potential reference to sock_common",
.insns = {
BPF_SK_LOOKUP(skc_lookup_tcp),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), /* leak reference */
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: leak potential reference on stack",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: leak potential reference on stack 2",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_ST_MEM(BPF_DW, BPF_REG_4, 0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: zero potential reference",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_IMM(BPF_REG_0, 0), /* leak reference */
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: zero potential reference to sock_common",
.insns = {
BPF_SK_LOOKUP(skc_lookup_tcp),
BPF_MOV64_IMM(BPF_REG_0, 0), /* leak reference */
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: copy and zero potential references",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_7, 0), /* leak reference */
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: acquire/release user key reference",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, -3),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_LSM,
.kfunc = "bpf",
.expected_attach_type = BPF_LSM_MAC,
.flags = BPF_F_SLEEPABLE,
.fixup_kfunc_btf_id = {
{ "bpf_lookup_user_key", 2 },
{ "bpf_key_put", 5 },
},
.result = ACCEPT,
},
{
"reference tracking: acquire/release system key reference",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, 1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_LSM,
.kfunc = "bpf",
.expected_attach_type = BPF_LSM_MAC,
.flags = BPF_F_SLEEPABLE,
.fixup_kfunc_btf_id = {
{ "bpf_lookup_system_key", 1 },
{ "bpf_key_put", 4 },
},
.result = ACCEPT,
},
{
"reference tracking: release user key reference without check",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, -3),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_LSM,
.kfunc = "bpf",
.expected_attach_type = BPF_LSM_MAC,
.flags = BPF_F_SLEEPABLE,
.errstr = "arg#0 expected pointer to btf or socket",
.fixup_kfunc_btf_id = {
{ "bpf_lookup_user_key", 2 },
{ "bpf_key_put", 4 },
},
.result = REJECT,
},
{
"reference tracking: release system key reference without check",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, 1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_LSM,
.kfunc = "bpf",
.expected_attach_type = BPF_LSM_MAC,
.flags = BPF_F_SLEEPABLE,
.errstr = "arg#0 expected pointer to btf or socket",
.fixup_kfunc_btf_id = {
{ "bpf_lookup_system_key", 1 },
{ "bpf_key_put", 3 },
},
.result = REJECT,
},
{
"reference tracking: release with NULL key pointer",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_LSM,
.kfunc = "bpf",
.expected_attach_type = BPF_LSM_MAC,
.flags = BPF_F_SLEEPABLE,
.errstr = "arg#0 pointer type STRUCT bpf_key must point to scalar, or struct with scalar",
.fixup_kfunc_btf_id = {
{ "bpf_key_put", 1 },
},
.result = REJECT,
},
{
"reference tracking: leak potential reference to user key",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, -3),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_LSM,
.kfunc = "bpf",
.expected_attach_type = BPF_LSM_MAC,
.flags = BPF_F_SLEEPABLE,
.errstr = "Unreleased reference",
.fixup_kfunc_btf_id = {
{ "bpf_lookup_user_key", 2 },
},
.result = REJECT,
},
{
"reference tracking: leak potential reference to system key",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, 1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_LSM,
.kfunc = "bpf",
.expected_attach_type = BPF_LSM_MAC,
.flags = BPF_F_SLEEPABLE,
.errstr = "Unreleased reference",
.fixup_kfunc_btf_id = {
{ "bpf_lookup_system_key", 1 },
},
.result = REJECT,
},
{
"reference tracking: release reference without check",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
/* reference in r0 may be NULL */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "type=sock_or_null expected=sock",
.result = REJECT,
},
{
"reference tracking: release reference to sock_common without check",
.insns = {
BPF_SK_LOOKUP(skc_lookup_tcp),
/* reference in r0 may be NULL */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "type=sock_common_or_null expected=sock",
.result = REJECT,
},
{
"reference tracking: release reference",
.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, 1),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
{
"reference tracking: release reference to sock_common",
.insns = {
BPF_SK_LOOKUP(skc_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_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
{
"reference tracking: release reference 2",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
{
"reference tracking: release reference twice",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
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 = "type=scalar expected=sock",
.result = REJECT,
},
{
"reference tracking: release reference twice inside branch",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3), /* goto end */
BPF_EMIT_CALL(BPF_FUNC_sk_release),
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 = "type=scalar expected=sock",
.result = REJECT,
},
{
"reference tracking: alloc, check, free in one subbranch",
.insns = {
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, 16),
/* if (offsetof(skb, mark) > data_len) exit; */
BPF_JMP_REG(BPF_JLE, BPF_REG_0, BPF_REG_3, 1),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_2,
offsetof(struct __sk_buff, mark)),
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 1), /* mark == 0? */
/* Leak reference in R0 */
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "Unreleased reference",
.result = REJECT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"reference tracking: alloc, check, free in both subbranches",
.insns = {
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, 16),
/* if (offsetof(skb, mark) > data_len) exit; */
BPF_JMP_REG(BPF_JLE, BPF_REG_0, BPF_REG_3, 1),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_2,
offsetof(struct __sk_buff, mark)),
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 4), /* mark == 0? */
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* sk NULL? */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"reference tracking in call: free reference in subprog",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), /* unchecked reference */
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_2, BPF_REG_1),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 0, 1),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
{
"reference tracking in call: free reference in subprog and outside",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), /* unchecked reference */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 0, 1),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.errstr = "type=scalar 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),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_4),
BPF_SK_LOOKUP(sk_lookup_tcp),
/* 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),
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, 3),
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, 3),
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, 3),
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",
.flags = F_NEEDS_EFFICIENT_UNALIGNED_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",
.flags = F_NEEDS_EFFICIENT_UNALIGNED_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",
.flags = F_NEEDS_EFFICIENT_UNALIGNED_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",
.flags = F_NEEDS_EFFICIENT_UNALIGNED_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 = "R1 must be referenced when passed to release function",
},
{
/* !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",
},
{
"reference tracking: branch tracking valid pointer null comparison",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_3, 1),
BPF_JMP_IMM(BPF_JNE, BPF_REG_6, 0, 1),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 2),
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: branch tracking valid pointer value comparison",
.insns = {
BPF_SK_LOOKUP(sk_lookup_tcp),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_3, 1),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 4),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 1234, 2),
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 = "Unreleased reference",
.result = REJECT,
},
{
"reference tracking: bpf_sk_release(btf_tcp_sock)",
.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_skc_to_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_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.result_unpriv = REJECT,
.errstr_unpriv = "unknown func",
},
{
"reference tracking: use ptr from bpf_skc_to_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_skc_to_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_B, BPF_REG_0, BPF_REG_7, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = REJECT,
.errstr = "invalid mem access",
.result_unpriv = REJECT,
.errstr_unpriv = "unknown func",
},
{
"reference tracking: try to leak released ptr reg",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_9, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_MOV64_IMM(BPF_REG_2, 8),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_EMIT_CALL(BPF_FUNC_ringbuf_reserve),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_EMIT_CALL(BPF_FUNC_ringbuf_discard),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_STX_MEM(BPF_DW, BPF_REG_9, BPF_REG_8, 0),
BPF_EXIT_INSN()
},
.fixup_map_array_48b = { 4 },
.fixup_map_ringbuf = { 11 },
.result = ACCEPT,
.result_unpriv = REJECT,
.errstr_unpriv = "R8 !read_ok"
},
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