196 lines
6.3 KiB
C
196 lines
6.3 KiB
C
{
|
|
"pointer/scalar confusion in state equality check (way 1)",
|
|
.insns = {
|
|
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_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
|
|
BPF_JMP_A(1),
|
|
BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
|
|
BPF_JMP_A(0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_map_hash_8b = { 3 },
|
|
.result = ACCEPT,
|
|
.retval = POINTER_VALUE,
|
|
.result_unpriv = REJECT,
|
|
.errstr_unpriv = "R0 leaks addr as return value"
|
|
},
|
|
{
|
|
"pointer/scalar confusion in state equality check (way 2)",
|
|
.insns = {
|
|
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_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
|
|
BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
|
|
BPF_JMP_A(1),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_map_hash_8b = { 3 },
|
|
.result = ACCEPT,
|
|
.retval = POINTER_VALUE,
|
|
.result_unpriv = REJECT,
|
|
.errstr_unpriv = "R0 leaks addr as return value"
|
|
},
|
|
{
|
|
"liveness pruning and write screening",
|
|
.insns = {
|
|
/* Get an unknown value */
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 0),
|
|
/* branch conditions teach us nothing about R2 */
|
|
BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.errstr = "R0 !read_ok",
|
|
.result = REJECT,
|
|
.prog_type = BPF_PROG_TYPE_LWT_IN,
|
|
},
|
|
{
|
|
"varlen_map_value_access pruning",
|
|
.insns = {
|
|
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_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
|
|
BPF_MOV32_IMM(BPF_REG_2, MAX_ENTRIES),
|
|
BPF_JMP_REG(BPF_JSGT, BPF_REG_2, BPF_REG_1, 1),
|
|
BPF_MOV32_IMM(BPF_REG_1, 0),
|
|
BPF_ALU32_IMM(BPF_LSH, BPF_REG_1, 2),
|
|
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
|
|
BPF_JMP_IMM(BPF_JA, 0, 0, 0),
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, offsetof(struct test_val, foo)),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_map_hash_48b = { 3 },
|
|
.errstr_unpriv = "R0 leaks addr",
|
|
.errstr = "R0 unbounded memory access",
|
|
.result_unpriv = REJECT,
|
|
.result = REJECT,
|
|
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
|
|
},
|
|
{
|
|
"search pruning: all branches should be verified (nop operation)",
|
|
.insns = {
|
|
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_JEQ, BPF_REG_0, 0, 11),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_3, 0xbeef, 2),
|
|
BPF_MOV64_IMM(BPF_REG_4, 0),
|
|
BPF_JMP_A(1),
|
|
BPF_MOV64_IMM(BPF_REG_4, 1),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_4, -16),
|
|
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_5, BPF_REG_10, -16),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_5, 0, 2),
|
|
BPF_MOV64_IMM(BPF_REG_6, 0),
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_6, 0, 0xdead),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_map_hash_8b = { 3 },
|
|
.errstr = "R6 invalid mem access 'inv'",
|
|
.result = REJECT,
|
|
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
|
|
},
|
|
{
|
|
"search pruning: all branches should be verified (invalid stack access)",
|
|
.insns = {
|
|
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_JEQ, BPF_REG_0, 0, 8),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0),
|
|
BPF_MOV64_IMM(BPF_REG_4, 0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_3, 0xbeef, 2),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_4, -16),
|
|
BPF_JMP_A(1),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_4, -24),
|
|
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_5, BPF_REG_10, -16),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.fixup_map_hash_8b = { 3 },
|
|
.errstr_unpriv = "invalid read from stack off -16+0 size 8",
|
|
.result_unpriv = REJECT,
|
|
/* in privileged mode reads from uninitialized stack locations are permitted */
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"allocated_stack",
|
|
.insns = {
|
|
BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
|
|
BPF_ALU64_REG(BPF_MOV, BPF_REG_7, BPF_REG_0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_10, -8),
|
|
BPF_STX_MEM(BPF_B, BPF_REG_10, BPF_REG_7, -9),
|
|
BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_10, -9),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.result = ACCEPT,
|
|
.result_unpriv = ACCEPT,
|
|
.insn_processed = 15,
|
|
},
|
|
/* The test performs a conditional 64-bit write to a stack location
|
|
* fp[-8], this is followed by an unconditional 8-bit write to fp[-8],
|
|
* then data is read from fp[-8]. This sequence is unsafe.
|
|
*
|
|
* The test would be mistakenly marked as safe w/o dst register parent
|
|
* preservation in verifier.c:copy_register_state() function.
|
|
*
|
|
* Note the usage of BPF_F_TEST_STATE_FREQ to force creation of the
|
|
* checkpoint state after conditional 64-bit assignment.
|
|
*/
|
|
{
|
|
"write tracking and register parent chain bug",
|
|
.insns = {
|
|
/* r6 = ktime_get_ns() */
|
|
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
|
/* r0 = ktime_get_ns() */
|
|
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
|
|
/* if r0 > r6 goto +1 */
|
|
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_6, 1),
|
|
/* *(u64 *)(r10 - 8) = 0xdeadbeef */
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_FP, -8, 0xdeadbeef),
|
|
/* r1 = 42 */
|
|
BPF_MOV64_IMM(BPF_REG_1, 42),
|
|
/* *(u8 *)(r10 - 8) = r1 */
|
|
BPF_STX_MEM(BPF_B, BPF_REG_FP, BPF_REG_1, -8),
|
|
/* r2 = *(u64 *)(r10 - 8) */
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_FP, -8),
|
|
/* exit(0) */
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.flags = BPF_F_TEST_STATE_FREQ,
|
|
.errstr_unpriv = "invalid read from stack off -8+1 size 8",
|
|
.result_unpriv = REJECT,
|
|
/* in privileged mode reads from uninitialized stack locations are permitted */
|
|
.result = ACCEPT,
|
|
},
|