94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
{
|
|
"context stores via ST",
|
|
.insns = {
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_1, offsetof(struct __sk_buff, mark), 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.errstr = "BPF_ST stores into R1 ctx is not allowed",
|
|
.result = REJECT,
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
},
|
|
{
|
|
"context stores via XADD",
|
|
.insns = {
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_RAW_INSN(BPF_STX | BPF_XADD | BPF_W, BPF_REG_1,
|
|
BPF_REG_0, offsetof(struct __sk_buff, mark), 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.errstr = "BPF_XADD stores into R1 ctx is not allowed",
|
|
.result = REJECT,
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
},
|
|
{
|
|
"arithmetic ops make PTR_TO_CTX unusable",
|
|
.insns = {
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1,
|
|
offsetof(struct __sk_buff, data) -
|
|
offsetof(struct __sk_buff, mark)),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
|
|
offsetof(struct __sk_buff, mark)),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.errstr = "dereference of modified ctx ptr",
|
|
.result = REJECT,
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
},
|
|
{
|
|
"pass unmodified ctx pointer to helper",
|
|
.insns = {
|
|
BPF_MOV64_IMM(BPF_REG_2, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_csum_update),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"pass modified ctx pointer to helper, 1",
|
|
.insns = {
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -612),
|
|
BPF_MOV64_IMM(BPF_REG_2, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_csum_update),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "dereference of modified ctx ptr",
|
|
},
|
|
{
|
|
"pass modified ctx pointer to helper, 2",
|
|
.insns = {
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -612),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_get_socket_cookie),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.result_unpriv = REJECT,
|
|
.result = REJECT,
|
|
.errstr_unpriv = "dereference of modified ctx ptr",
|
|
.errstr = "dereference of modified ctx ptr",
|
|
},
|
|
{
|
|
"pass modified ctx pointer to helper, 3",
|
|
.insns = {
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1, 0),
|
|
BPF_ALU64_IMM(BPF_AND, BPF_REG_3, 4),
|
|
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_3),
|
|
BPF_MOV64_IMM(BPF_REG_2, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_csum_update),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.result = REJECT,
|
|
.errstr = "variable ctx access var_off=(0x0; 0x4)",
|
|
},
|