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Merge branch 'BPF-map-value-adjust-fix'

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Daniel Borkmann says:

====================
BPF map value adjust fix

First patch in the series is the actual fix and the remaining
patches are just updates to selftests.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-07-20 15:20:28 -07:00
commit 5067f4cf23
6 changed files with 574 additions and 23 deletions
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1
include/linux/bpf_verifier.h
View File

@ -43,6 +43,7 @@ struct bpf_reg_state {
u32 min_align;
u32 aux_off;
u32 aux_off_align;
bool value_from_signed;
};
enum bpf_stack_slot_type {

108
kernel/bpf/verifier.c
View File

@ -504,6 +504,7 @@ static void reset_reg_range_values(struct bpf_reg_state *regs, u32 regno)
{
regs[regno].min_value = BPF_REGISTER_MIN_RANGE;
regs[regno].max_value = BPF_REGISTER_MAX_RANGE;
regs[regno].value_from_signed = false;
regs[regno].min_align = 0;
}
@ -777,12 +778,13 @@ static int check_ctx_access(struct bpf_verifier_env *env, int insn_idx, int off,
return -EACCES;
}
static bool is_pointer_value(struct bpf_verifier_env *env, int regno)
static bool __is_pointer_value(bool allow_ptr_leaks,
const struct bpf_reg_state *reg)
{
if (env->allow_ptr_leaks)
if (allow_ptr_leaks)
return false;
switch (env->cur_state.regs[regno].type) {
switch (reg->type) {
case UNKNOWN_VALUE:
case CONST_IMM:
return false;
@ -791,6 +793,11 @@ static bool is_pointer_value(struct bpf_verifier_env *env, int regno)
}
}
static bool is_pointer_value(struct bpf_verifier_env *env, int regno)
{
return __is_pointer_value(env->allow_ptr_leaks, &env->cur_state.regs[regno]);
}
static int check_pkt_ptr_alignment(const struct bpf_reg_state *reg,
int off, int size, bool strict)
{
@ -1832,10 +1839,24 @@ static void adjust_reg_min_max_vals(struct bpf_verifier_env *env,
dst_align = dst_reg->min_align;
/* We don't know anything about what was done to this register, mark it
* as unknown.
* as unknown. Also, if both derived bounds came from signed/unsigned
* mixed compares and one side is unbounded, we cannot really do anything
* with them as boundaries cannot be trusted. Thus, arithmetic of two
* regs of such kind will get invalidated bounds on the dst side.
*/
if (min_val == BPF_REGISTER_MIN_RANGE &&
max_val == BPF_REGISTER_MAX_RANGE) {
if ((min_val == BPF_REGISTER_MIN_RANGE &&
max_val == BPF_REGISTER_MAX_RANGE) ||
(BPF_SRC(insn->code) == BPF_X &&
((min_val != BPF_REGISTER_MIN_RANGE &&
max_val == BPF_REGISTER_MAX_RANGE) ||
(min_val == BPF_REGISTER_MIN_RANGE &&
max_val != BPF_REGISTER_MAX_RANGE) ||
(dst_reg->min_value != BPF_REGISTER_MIN_RANGE &&
dst_reg->max_value == BPF_REGISTER_MAX_RANGE) ||
(dst_reg->min_value == BPF_REGISTER_MIN_RANGE &&
dst_reg->max_value != BPF_REGISTER_MAX_RANGE)) &&
regs[insn->dst_reg].value_from_signed !=
regs[insn->src_reg].value_from_signed)) {
reset_reg_range_values(regs, insn->dst_reg);
return;
}
@ -2023,6 +2044,7 @@ static int check_alu_op(struct bpf_verifier_env *env, struct bpf_insn *insn)
regs[insn->dst_reg].max_value = insn->imm;
regs[insn->dst_reg].min_value = insn->imm;
regs[insn->dst_reg].min_align = calc_align(insn->imm);
regs[insn->dst_reg].value_from_signed = false;
}
} else if (opcode > BPF_END) {
@ -2198,40 +2220,63 @@ static void reg_set_min_max(struct bpf_reg_state *true_reg,
struct bpf_reg_state *false_reg, u64 val,
u8 opcode)
{
bool value_from_signed = true;
bool is_range = true;
switch (opcode) {
case BPF_JEQ:
/* If this is false then we know nothing Jon Snow, but if it is
* true then we know for sure.
*/
true_reg->max_value = true_reg->min_value = val;
is_range = false;
break;
case BPF_JNE:
/* If this is true we know nothing Jon Snow, but if it is false
* we know the value for sure;
*/
false_reg->max_value = false_reg->min_value = val;
is_range = false;
break;
case BPF_JGT:
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
value_from_signed = false;
/* fallthrough */
case BPF_JSGT:
if (true_reg->value_from_signed != value_from_signed)
reset_reg_range_values(true_reg, 0);
if (false_reg->value_from_signed != value_from_signed)
reset_reg_range_values(false_reg, 0);
if (opcode == BPF_JGT) {
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
}
/* If this is false then we know the maximum val is val,
* otherwise we know the min val is val+1.
*/
false_reg->max_value = val;
false_reg->value_from_signed = value_from_signed;
true_reg->min_value = val + 1;
true_reg->value_from_signed = value_from_signed;
break;
case BPF_JGE:
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
value_from_signed = false;
/* fallthrough */
case BPF_JSGE:
if (true_reg->value_from_signed != value_from_signed)
reset_reg_range_values(true_reg, 0);
if (false_reg->value_from_signed != value_from_signed)
reset_reg_range_values(false_reg, 0);
if (opcode == BPF_JGE) {
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
}
/* If this is false then we know the maximum value is val - 1,
* otherwise we know the mimimum value is val.
*/
false_reg->max_value = val - 1;
false_reg->value_from_signed = value_from_signed;
true_reg->min_value = val;
true_reg->value_from_signed = value_from_signed;
break;
default:
break;
@ -2239,6 +2284,12 @@ static void reg_set_min_max(struct bpf_reg_state *true_reg,
check_reg_overflow(false_reg);
check_reg_overflow(true_reg);
if (is_range) {
if (__is_pointer_value(false, false_reg))
reset_reg_range_values(false_reg, 0);
if (__is_pointer_value(false, true_reg))
reset_reg_range_values(true_reg, 0);
}
}
/* Same as above, but for the case that dst_reg is a CONST_IMM reg and src_reg
@ -2248,41 +2299,64 @@ static void reg_set_min_max_inv(struct bpf_reg_state *true_reg,
struct bpf_reg_state *false_reg, u64 val,
u8 opcode)
{
bool value_from_signed = true;
bool is_range = true;
switch (opcode) {
case BPF_JEQ:
/* If this is false then we know nothing Jon Snow, but if it is
* true then we know for sure.
*/
true_reg->max_value = true_reg->min_value = val;
is_range = false;
break;
case BPF_JNE:
/* If this is true we know nothing Jon Snow, but if it is false
* we know the value for sure;
*/
false_reg->max_value = false_reg->min_value = val;
is_range = false;
break;
case BPF_JGT:
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
value_from_signed = false;
/* fallthrough */
case BPF_JSGT:
if (true_reg->value_from_signed != value_from_signed)
reset_reg_range_values(true_reg, 0);
if (false_reg->value_from_signed != value_from_signed)
reset_reg_range_values(false_reg, 0);
if (opcode == BPF_JGT) {
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
}
/*
* If this is false, then the val is <= the register, if it is
* true the register <= to the val.
*/
false_reg->min_value = val;
false_reg->value_from_signed = value_from_signed;
true_reg->max_value = val - 1;
true_reg->value_from_signed = value_from_signed;
break;
case BPF_JGE:
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
value_from_signed = false;
/* fallthrough */
case BPF_JSGE:
if (true_reg->value_from_signed != value_from_signed)
reset_reg_range_values(true_reg, 0);
if (false_reg->value_from_signed != value_from_signed)
reset_reg_range_values(false_reg, 0);
if (opcode == BPF_JGE) {
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
}
/* If this is false then constant < register, if it is true then
* the register < constant.
*/
false_reg->min_value = val + 1;
false_reg->value_from_signed = value_from_signed;
true_reg->max_value = val;
true_reg->value_from_signed = value_from_signed;
break;
default:
break;
@ -2290,6 +2364,12 @@ static void reg_set_min_max_inv(struct bpf_reg_state *true_reg,
check_reg_overflow(false_reg);
check_reg_overflow(true_reg);
if (is_range) {
if (__is_pointer_value(false, false_reg))
reset_reg_range_values(false_reg, 0);
if (__is_pointer_value(false, true_reg))
reset_reg_range_values(true_reg, 0);
}
}
static void mark_map_reg(struct bpf_reg_state *regs, u32 regno, u32 id,

4
tools/lib/bpf/bpf.c
View File

@ -120,7 +120,7 @@ int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
size_t insns_cnt, int strict_alignment,
const char *license, __u32 kern_version,
char *log_buf, size_t log_buf_sz)
char *log_buf, size_t log_buf_sz, int log_level)
{
union bpf_attr attr;
@ -131,7 +131,7 @@ int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
attr.license = ptr_to_u64(license);
attr.log_buf = ptr_to_u64(log_buf);
attr.log_size = log_buf_sz;
attr.log_level = 2;
attr.log_level = log_level;
log_buf[0] = 0;
attr.kern_version = kern_version;
attr.prog_flags = strict_alignment ? BPF_F_STRICT_ALIGNMENT : 0;

2
tools/lib/bpf/bpf.h
View File

@ -38,7 +38,7 @@ int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
size_t insns_cnt, int strict_alignment,
const char *license, __u32 kern_version,
char *log_buf, size_t log_buf_sz);
char *log_buf, size_t log_buf_sz, int log_level);
int bpf_map_update_elem(int fd, const void *key, const void *value,
__u64 flags);

2
tools/testing/selftests/bpf/test_align.c
View File

@ -380,7 +380,7 @@ static int do_test_single(struct bpf_align_test *test)
prog_len = probe_filter_length(prog);
fd_prog = bpf_verify_program(prog_type ? : BPF_PROG_TYPE_SOCKET_FILTER,
prog, prog_len, 1, "GPL", 0,
bpf_vlog, sizeof(bpf_vlog));
bpf_vlog, sizeof(bpf_vlog), 2);
if (fd_prog < 0) {
printf("Failed to load program.\n");
printf("%s", bpf_vlog);

480
tools/testing/selftests/bpf/test_verifier.c
View File

@ -4969,7 +4969,7 @@ static struct bpf_test tests[] = {
BPF_JMP_IMM(BPF_JSGT, BPF_REG_2,
sizeof(struct test_val), 4),
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_JMP_REG(BPF_JGE, BPF_REG_4, BPF_REG_2, 2),
BPF_JMP_REG(BPF_JSGE, BPF_REG_4, BPF_REG_2, 2),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_EMIT_CALL(BPF_FUNC_probe_read),
BPF_MOV64_IMM(BPF_REG_0, 0),
@ -4995,7 +4995,7 @@ static struct bpf_test tests[] = {
BPF_JMP_IMM(BPF_JSGT, BPF_REG_2,
sizeof(struct test_val) + 1, 4),
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_JMP_REG(BPF_JGE, BPF_REG_4, BPF_REG_2, 2),
BPF_JMP_REG(BPF_JSGE, BPF_REG_4, BPF_REG_2, 2),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_EMIT_CALL(BPF_FUNC_probe_read),
BPF_MOV64_IMM(BPF_REG_0, 0),
@ -5023,7 +5023,7 @@ static struct bpf_test tests[] = {
BPF_JMP_IMM(BPF_JSGT, BPF_REG_2,
sizeof(struct test_val) - 20, 4),
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_JMP_REG(BPF_JGE, BPF_REG_4, BPF_REG_2, 2),
BPF_JMP_REG(BPF_JSGE, BPF_REG_4, BPF_REG_2, 2),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_EMIT_CALL(BPF_FUNC_probe_read),
BPF_MOV64_IMM(BPF_REG_0, 0),
@ -5050,7 +5050,7 @@ static struct bpf_test tests[] = {
BPF_JMP_IMM(BPF_JSGT, BPF_REG_2,
sizeof(struct test_val) - 19, 4),
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_JMP_REG(BPF_JGE, BPF_REG_4, BPF_REG_2, 2),
BPF_JMP_REG(BPF_JSGE, BPF_REG_4, BPF_REG_2, 2),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_EMIT_CALL(BPF_FUNC_probe_read),
BPF_MOV64_IMM(BPF_REG_0, 0),
@ -5510,6 +5510,476 @@ static struct bpf_test tests[] = {
.errstr = "invalid bpf_context access",
.prog_type = BPF_PROG_TYPE_LWT_IN,
},
{
"bounds checks mixing signed and unsigned, positive bounds",
.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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 2),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 3),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 4, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned",
.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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 3),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 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_JEQ, BPF_REG_0, 0, 9),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 5),
BPF_MOV64_IMM(BPF_REG_8, 0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_8, BPF_REG_1),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_8, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_8),
BPF_ST_MEM(BPF_B, BPF_REG_8, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R8 invalid mem access 'inv'",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 3",
.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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 4),
BPF_MOV64_REG(BPF_REG_8, BPF_REG_1),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_8, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_8),
BPF_ST_MEM(BPF_B, BPF_REG_8, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R8 invalid mem access 'inv'",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 4",
.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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 1),
BPF_ALU64_REG(BPF_AND, BPF_REG_1, BPF_REG_2),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 5",
.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, 9),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 5),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 4),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 4),
BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 invalid mem access",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 6",
.insns = {
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -512),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_6, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_6, 5),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_4, 1, 4),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 1),
BPF_MOV64_IMM(BPF_REG_5, 0),
BPF_ST_MEM(BPF_H, BPF_REG_10, -512, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_skb_load_bytes),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R4 min value is negative, either use unsigned",
.errstr = "R4 min value is negative, either use unsigned",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 7",
.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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 1024 * 1024 * 1024),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 3),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 8",
.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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 1024 * 1024 * 1024 + 1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 3),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 9",
.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, 9),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_1, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 10",
.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, 10),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_LD_IMM64(BPF_REG_2, -9223372036854775808ULL),
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_1, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 11",
.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, 9),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_1, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 12",
.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, 9),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
/* Dead branch. */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 13",
.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, 9),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -6),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 14",
.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, 6),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 2),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
BPF_MOV64_IMM(BPF_REG_7, 1),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_7, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_1),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_7, 4, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_7),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 15",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_9, BPF_REG_1,
offsetof(struct __sk_buff, mark)),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_MOV64_IMM(BPF_REG_8, 2),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_9, 42, 6),
BPF_JMP_REG(BPF_JSGT, BPF_REG_8, BPF_REG_1, 3),
BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 1, 2),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, -3),
BPF_JMP_IMM(BPF_JA, 0, 0, -7),
},
.fixup_map1 = { 4 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 16",
.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, 4),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -6),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_JMP_IMM(BPF_JGT, BPF_REG_0, 1, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_ST_MEM(BPF_B, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map1 = { 3 },
.errstr_unpriv = "R0 pointer arithmetic prohibited",
.errstr = "R0 min value is negative",
.result = REJECT,
.result_unpriv = REJECT,
},
};
static int probe_filter_length(const struct bpf_insn *fp)
@ -5633,7 +6103,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
fd_prog = bpf_verify_program(prog_type ? : BPF_PROG_TYPE_SOCKET_FILTER,
prog, prog_len, test->flags & F_LOAD_WITH_STRICT_ALIGNMENT,
"GPL", 0, bpf_vlog, sizeof(bpf_vlog));
"GPL", 0, bpf_vlog, sizeof(bpf_vlog), 1);
expected_ret = unpriv && test->result_unpriv != UNDEF ?
test->result_unpriv : test->result;