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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

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Alexei Starovoitov says:

====================
pull-request: bpf 2020-04-24

The following pull-request contains BPF updates for your *net* tree.

We've added 17 non-merge commits during the last 5 day(s) which contain
a total of 19 files changed, 203 insertions(+), 85 deletions(-).

The main changes are:

1) link_update fix, from Andrii.

2) libbpf get_xdp_id fix, from David.

3) xadd verifier fix, from Jann.

4) x86-32 JIT fixes, from Luke and Wang.

5) test_btf fix, from Stanislav.

6) freplace verifier fix, from Toke.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-04-24 18:26:14 -07:00
commit 167ff131cb
19 changed files with 203 additions and 85 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
arch/x86/net/bpf_jit_comp.c
View File

@ -158,6 +158,19 @@ static bool is_ereg(u32 reg)
BIT(BPF_REG_AX));
}
/*
* is_ereg_8l() == true if BPF register 'reg' is mapped to access x86-64
* lower 8-bit registers dil,sil,bpl,spl,r8b..r15b, which need extra byte
* of encoding. al,cl,dl,bl have simpler encoding.
*/
static bool is_ereg_8l(u32 reg)
{
return is_ereg(reg) ||
(1 << reg) & (BIT(BPF_REG_1) |
BIT(BPF_REG_2) |
BIT(BPF_REG_FP));
}
static bool is_axreg(u32 reg)
{
return reg == BPF_REG_0;
@ -598,9 +611,8 @@ static void emit_stx(u8 **pprog, u32 size, u32 dst_reg, u32 src_reg, int off)
switch (size) {
case BPF_B:
/* Emit 'mov byte ptr [rax + off], al' */
if (is_ereg(dst_reg) || is_ereg(src_reg) ||
/* We have to add extra byte for x86 SIL, DIL regs */
src_reg == BPF_REG_1 || src_reg == BPF_REG_2)
if (is_ereg(dst_reg) || is_ereg_8l(src_reg))
/* Add extra byte for eregs or SIL,DIL,BPL in src_reg */
EMIT2(add_2mod(0x40, dst_reg, src_reg), 0x88);
else
EMIT1(0x88);

28
arch/x86/net/bpf_jit_comp32.c
View File

@ -1847,14 +1847,16 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_B:
case BPF_H:
case BPF_W:
if (!bpf_prog->aux->verifier_zext)
if (bpf_prog->aux->verifier_zext)
break;
if (dstk) {
EMIT3(0xC7, add_1reg(0x40, IA32_EBP),
STACK_VAR(dst_hi));
EMIT(0x0, 4);
} else {
EMIT3(0xC7, add_1reg(0xC0, dst_hi), 0);
/* xor dst_hi,dst_hi */
EMIT2(0x33,
add_2reg(0xC0, dst_hi, dst_hi));
}
break;
case BPF_DW:
@ -2013,8 +2015,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_JMP | BPF_JSET | BPF_X:
case BPF_JMP32 | BPF_JSET | BPF_X: {
bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;
u8 dreg_lo = IA32_EAX;
u8 dreg_hi = IA32_EDX;
u8 sreg_lo = sstk ? IA32_ECX : src_lo;
u8 sreg_hi = sstk ? IA32_EBX : src_hi;
@ -2026,6 +2028,13 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
add_2reg(0x40, IA32_EBP,
IA32_EDX),
STACK_VAR(dst_hi));
} else {
/* mov dreg_lo,dst_lo */
EMIT2(0x89, add_2reg(0xC0, dreg_lo, dst_lo));
if (is_jmp64)
/* mov dreg_hi,dst_hi */
EMIT2(0x89,
add_2reg(0xC0, dreg_hi, dst_hi));
}
if (sstk) {
@ -2050,8 +2059,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_JMP | BPF_JSET | BPF_K:
case BPF_JMP32 | BPF_JSET | BPF_K: {
bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;
u8 dreg_lo = IA32_EAX;
u8 dreg_hi = IA32_EDX;
u8 sreg_lo = IA32_ECX;
u8 sreg_hi = IA32_EBX;
u32 hi;
@ -2064,6 +2073,13 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
add_2reg(0x40, IA32_EBP,
IA32_EDX),
STACK_VAR(dst_hi));
} else {
/* mov dreg_lo,dst_lo */
EMIT2(0x89, add_2reg(0xC0, dreg_lo, dst_lo));
if (is_jmp64)
/* mov dreg_hi,dst_hi */
EMIT2(0x89,
add_2reg(0xC0, dreg_hi, dst_hi));
}
/* mov ecx,imm32 */

2
include/uapi/linux/bpf.h
View File

@ -1642,7 +1642,7 @@ union bpf_attr {
* ifindex, but doesn't require a map to do so.
* Return
* **XDP_REDIRECT** on success, or the value of the two lower bits
* of the **flags* argument on error.
* of the *flags* argument on error.
*
* int bpf_sk_redirect_map(struct sk_buff *skb, struct bpf_map *map, u32 key, u64 flags)
* Description

2
kernel/bpf/cpumap.c
View File

@ -469,7 +469,7 @@ static int cpu_map_update_elem(struct bpf_map *map, void *key, void *value,
return -EOVERFLOW;
/* Make sure CPU is a valid possible cpu */
if (!cpu_possible(key_cpu))
if (key_cpu >= nr_cpumask_bits || !cpu_possible(key_cpu))
return -ENODEV;
if (qsize == 0) {

13
kernel/bpf/syscall.c
View File

@ -2283,7 +2283,7 @@ static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
}
#endif
const struct file_operations bpf_link_fops = {
static const struct file_operations bpf_link_fops = {
#ifdef CONFIG_PROC_FS
.show_fdinfo = bpf_link_show_fdinfo,
#endif
@ -3628,8 +3628,10 @@ static int link_update(union bpf_attr *attr)
return PTR_ERR(link);
new_prog = bpf_prog_get(attr->link_update.new_prog_fd);
if (IS_ERR(new_prog))
return PTR_ERR(new_prog);
if (IS_ERR(new_prog)) {
ret = PTR_ERR(new_prog);
goto out_put_link;
}
if (flags & BPF_F_REPLACE) {
old_prog = bpf_prog_get(attr->link_update.old_prog_fd);
@ -3638,6 +3640,9 @@ static int link_update(union bpf_attr *attr)
old_prog = NULL;
goto out_put_progs;
}
} else if (attr->link_update.old_prog_fd) {
ret = -EINVAL;
goto out_put_progs;
}
#ifdef CONFIG_CGROUP_BPF
@ -3653,6 +3658,8 @@ out_put_progs:
bpf_prog_put(old_prog);
if (ret)
bpf_prog_put(new_prog);
out_put_link:
bpf_link_put(link);
return ret;
}

38
kernel/bpf/verifier.c
View File

@ -2118,6 +2118,15 @@ static bool register_is_const(struct bpf_reg_state *reg)
return reg->type == SCALAR_VALUE && tnum_is_const(reg->var_off);
}
static bool __is_pointer_value(bool allow_ptr_leaks,
const struct bpf_reg_state *reg)
{
if (allow_ptr_leaks)
return false;
return reg->type != SCALAR_VALUE;
}
static void save_register_state(struct bpf_func_state *state,
int spi, struct bpf_reg_state *reg)
{
@ -2308,6 +2317,16 @@ static int check_stack_read(struct bpf_verifier_env *env,
* which resets stack/reg liveness for state transitions
*/
state->regs[value_regno].live |= REG_LIVE_WRITTEN;
} else if (__is_pointer_value(env->allow_ptr_leaks, reg)) {
/* If value_regno==-1, the caller is asking us whether
* it is acceptable to use this value as a SCALAR_VALUE
* (e.g. for XADD).
* We must not allow unprivileged callers to do that
* with spilled pointers.
*/
verbose(env, "leaking pointer from stack off %d\n",
off);
return -EACCES;
}
mark_reg_read(env, reg, reg->parent, REG_LIVE_READ64);
} else {
@ -2673,15 +2692,6 @@ static int check_sock_access(struct bpf_verifier_env *env, int insn_idx,
return -EACCES;
}
static bool __is_pointer_value(bool allow_ptr_leaks,
const struct bpf_reg_state *reg)
{
if (allow_ptr_leaks)
return false;
return reg->type != SCALAR_VALUE;
}
static struct bpf_reg_state *reg_state(struct bpf_verifier_env *env, int regno)
{
return cur_regs(env) + regno;
@ -3089,7 +3099,7 @@ static int check_ptr_to_btf_access(struct bpf_verifier_env *env,
if (ret < 0)
return ret;
if (atype == BPF_READ) {
if (atype == BPF_READ && value_regno >= 0) {
if (ret == SCALAR_VALUE) {
mark_reg_unknown(env, regs, value_regno);
return 0;
@ -10487,6 +10497,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
return -EINVAL;
}
env->ops = bpf_verifier_ops[tgt_prog->type];
prog->expected_attach_type = tgt_prog->expected_attach_type;
}
if (!tgt_prog->jited) {
verbose(env, "Can attach to only JITed progs\n");
@ -10831,6 +10842,13 @@ err_release_maps:
* them now. Otherwise free_used_maps() will release them.
*/
release_maps(env);
/* extension progs temporarily inherit the attach_type of their targets
for verification purposes, so set it back to zero before returning
*/
if (env->prog->type == BPF_PROG_TYPE_EXT)
env->prog->expected_attach_type = 0;
*prog = env->prog;
err_unlock:
if (!is_priv)

8
tools/bpf/bpftool/struct_ops.c
View File

@ -479,6 +479,7 @@ static int do_unregister(int argc, char **argv)
static int do_register(int argc, char **argv)
{
struct bpf_object_load_attr load_attr = {};
const struct bpf_map_def *def;
struct bpf_map_info info = {};
__u32 info_len = sizeof(info);
@ -499,7 +500,12 @@ static int do_register(int argc, char **argv)
set_max_rlimit();
if (bpf_object__load(obj)) {
load_attr.obj = obj;
if (verifier_logs)
/* log_level1 + log_level2 + stats, but not stable UAPI */
load_attr.log_level = 1 + 2 + 4;
if (bpf_object__load_xattr(&load_attr)) {
bpf_object__close(obj);
return -1;
}

2
tools/bpf/runqslower/Makefile
View File

@ -8,7 +8,7 @@ BPFTOOL ?= $(DEFAULT_BPFTOOL)
LIBBPF_SRC := $(abspath ../../lib/bpf)
BPFOBJ := $(OUTPUT)/libbpf.a
BPF_INCLUDE := $(OUTPUT)
INCLUDES := -I$(BPF_INCLUDE) -I$(OUTPUT) -I$(abspath ../../lib)
INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../lib)
CFLAGS := -g -Wall
# Try to detect best kernel BTF source

2
tools/include/uapi/linux/bpf.h
View File

@ -1642,7 +1642,7 @@ union bpf_attr {
* ifindex, but doesn't require a map to do so.
* Return
* **XDP_REDIRECT** on success, or the value of the two lower bits
* of the **flags* argument on error.
* of the *flags* argument on error.
*
* int bpf_sk_redirect_map(struct sk_buff *skb, struct bpf_map *map, u32 key, u64 flags)
* Description

2
tools/lib/bpf/netlink.c
View File

@ -321,6 +321,8 @@ int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
static __u32 get_xdp_id(struct xdp_link_info *info, __u32 flags)
{
flags &= XDP_FLAGS_MODES;
if (info->attach_mode != XDP_ATTACHED_MULTI && !flags)
return info->prog_id;
if (flags & XDP_FLAGS_DRV_MODE)

30
tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
View File

@ -5,7 +5,8 @@
static void test_fexit_bpf2bpf_common(const char *obj_file,
const char *target_obj_file,
int prog_cnt,
const char **prog_name)
const char **prog_name,
bool run_prog)
{
struct bpf_object *obj = NULL, *pkt_obj;
int err, pkt_fd, i;
@ -18,7 +19,8 @@ static void test_fexit_bpf2bpf_common(const char *obj_file,
err = bpf_prog_load(target_obj_file, BPF_PROG_TYPE_UNSPEC,
&pkt_obj, &pkt_fd);
if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n",
target_obj_file, err, errno))
return;
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
.attach_prog_fd = pkt_fd,
@ -33,7 +35,7 @@ static void test_fexit_bpf2bpf_common(const char *obj_file,
obj = bpf_object__open_file(obj_file, &opts);
if (CHECK(IS_ERR_OR_NULL(obj), "obj_open",
"failed to open fexit_bpf2bpf: %ld\n",
"failed to open %s: %ld\n", obj_file,
PTR_ERR(obj)))
goto close_prog;
@ -49,6 +51,10 @@ static void test_fexit_bpf2bpf_common(const char *obj_file,
if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n"))
goto close_prog;
}
if (!run_prog)
goto close_prog;
data_map = bpf_object__find_map_by_name(obj, "fexit_bp.bss");
if (CHECK(!data_map, "find_data_map", "data map not found\n"))
goto close_prog;
@ -89,7 +95,7 @@ static void test_target_no_callees(void)
test_fexit_bpf2bpf_common("./fexit_bpf2bpf_simple.o",
"./test_pkt_md_access.o",
ARRAY_SIZE(prog_name),
prog_name);
prog_name, true);
}
static void test_target_yes_callees(void)
@ -103,7 +109,7 @@ static void test_target_yes_callees(void)
test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o",
"./test_pkt_access.o",
ARRAY_SIZE(prog_name),
prog_name);
prog_name, true);
}
static void test_func_replace(void)
@ -120,7 +126,18 @@ static void test_func_replace(void)
test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o",
"./test_pkt_access.o",
ARRAY_SIZE(prog_name),
prog_name);
prog_name, true);
}
static void test_func_replace_verify(void)
{
const char *prog_name[] = {
"freplace/do_bind",
};
test_fexit_bpf2bpf_common("./freplace_connect4.o",
"./connect4_prog.o",
ARRAY_SIZE(prog_name),
prog_name, false);
}
void test_fexit_bpf2bpf(void)
@ -128,4 +145,5 @@ void test_fexit_bpf2bpf(void)
test_target_no_callees();
test_target_yes_callees();
test_func_replace();
test_func_replace_verify();
}

28
tools/testing/selftests/bpf/progs/connect4_prog.c
View File

@ -18,11 +18,25 @@
int _version SEC("version") = 1;
__attribute__ ((noinline))
int do_bind(struct bpf_sock_addr *ctx)
{
struct sockaddr_in sa = {};
sa.sin_family = AF_INET;
sa.sin_port = bpf_htons(0);
sa.sin_addr.s_addr = bpf_htonl(SRC_REWRITE_IP4);
if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
return 0;
return 1;
}
SEC("cgroup/connect4")
int connect_v4_prog(struct bpf_sock_addr *ctx)
{
struct bpf_sock_tuple tuple = {};
struct sockaddr_in sa;
struct bpf_sock *sk;
/* Verify that new destination is available. */
@ -56,17 +70,7 @@ int connect_v4_prog(struct bpf_sock_addr *ctx)
ctx->user_ip4 = bpf_htonl(DST_REWRITE_IP4);
ctx->user_port = bpf_htons(DST_REWRITE_PORT4);
/* Rewrite source. */
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = bpf_htons(0);
sa.sin_addr.s_addr = bpf_htonl(SRC_REWRITE_IP4);
if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
return 0;
return 1;
return do_bind(ctx) ? 1 : 0;
}
char _license[] SEC("license") = "GPL";

18
tools/testing/selftests/bpf/progs/freplace_connect4.c Normal file
View File

@ -0,0 +1,18 @@
#include <linux/stddef.h>
#include <linux/ipv6.h>
#include <linux/bpf.h>
#include <linux/in.h>
#include <sys/socket.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
SEC("freplace/do_bind")
int new_do_bind(struct bpf_sock_addr *ctx)
{
struct sockaddr_in sa = {};
bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa));
return 0;
}
char _license[] SEC("license") = "GPL";

18
tools/testing/selftests/bpf/progs/test_btf_haskv.c
View File

@ -20,20 +20,12 @@ struct bpf_map_def SEC("maps") btf_map = {
BPF_ANNOTATE_KV_PAIR(btf_map, int, struct ipv_counts);
struct dummy_tracepoint_args {
unsigned long long pad;
struct sock *sock;
};
__attribute__((noinline))
int test_long_fname_2(struct dummy_tracepoint_args *arg)
int test_long_fname_2(void)
{
struct ipv_counts *counts;
int key = 0;
if (!arg->sock)
return 0;
counts = bpf_map_lookup_elem(&btf_map, &key);
if (!counts)
return 0;
@ -44,15 +36,15 @@ int test_long_fname_2(struct dummy_tracepoint_args *arg)
}
__attribute__((noinline))
int test_long_fname_1(struct dummy_tracepoint_args *arg)
int test_long_fname_1(void)
{
return test_long_fname_2(arg);
return test_long_fname_2();
}
SEC("dummy_tracepoint")
int _dummy_tracepoint(struct dummy_tracepoint_args *arg)
int _dummy_tracepoint(void *arg)
{
return test_long_fname_1(arg);
return test_long_fname_1();
}
char _license[] SEC("license") = "GPL";

18
tools/testing/selftests/bpf/progs/test_btf_newkv.c
View File

@ -28,20 +28,12 @@ struct {
__type(value, struct ipv_counts);
} btf_map SEC(".maps");
struct dummy_tracepoint_args {
unsigned long long pad;
struct sock *sock;
};
__attribute__((noinline))
int test_long_fname_2(struct dummy_tracepoint_args *arg)
int test_long_fname_2(void)
{
struct ipv_counts *counts;
int key = 0;
if (!arg->sock)
return 0;
counts = bpf_map_lookup_elem(&btf_map, &key);
if (!counts)
return 0;
@ -57,15 +49,15 @@ int test_long_fname_2(struct dummy_tracepoint_args *arg)
}
__attribute__((noinline))
int test_long_fname_1(struct dummy_tracepoint_args *arg)
int test_long_fname_1(void)
{
return test_long_fname_2(arg);
return test_long_fname_2();
}
SEC("dummy_tracepoint")
int _dummy_tracepoint(struct dummy_tracepoint_args *arg)
int _dummy_tracepoint(void *arg)
{
return test_long_fname_1(arg);
return test_long_fname_1();
}
char _license[] SEC("license") = "GPL";

18
tools/testing/selftests/bpf/progs/test_btf_nokv.c
View File

@ -17,20 +17,12 @@ struct bpf_map_def SEC("maps") btf_map = {
.max_entries = 4,
};
struct dummy_tracepoint_args {
unsigned long long pad;
struct sock *sock;
};
__attribute__((noinline))
int test_long_fname_2(struct dummy_tracepoint_args *arg)
int test_long_fname_2(void)
{
struct ipv_counts *counts;
int key = 0;
if (!arg->sock)
return 0;
counts = bpf_map_lookup_elem(&btf_map, &key);
if (!counts)
return 0;
@ -41,15 +33,15 @@ int test_long_fname_2(struct dummy_tracepoint_args *arg)
}
__attribute__((noinline))
int test_long_fname_1(struct dummy_tracepoint_args *arg)
int test_long_fname_1(void)
{
return test_long_fname_2(arg);
return test_long_fname_2();
}
SEC("dummy_tracepoint")
int _dummy_tracepoint(struct dummy_tracepoint_args *arg)
int _dummy_tracepoint(void *arg)
{
return test_long_fname_1(arg);
return test_long_fname_1();
}
char _license[] SEC("license") = "GPL";

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

@ -2854,7 +2854,7 @@ static struct btf_raw_test raw_tests[] = {
.value_type_id = 1,
.max_entries = 4,
.btf_load_err = true,
.err_str = "vlen != 0",
.err_str = "Invalid func linkage",
},
{

40
tools/testing/selftests/bpf/verifier/stack_ptr.c
View File

@ -315,3 +315,43 @@
},
.result = ACCEPT,
},
{
"store PTR_TO_STACK in R10 to array map using BPF_B",
.insns = {
/* Load pointer to map. */
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_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 2),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
/* Copy R10 to R9. */
BPF_MOV64_REG(BPF_REG_9, BPF_REG_10),
/* Pollute other registers with unaligned values. */
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_MOV64_IMM(BPF_REG_3, -1),
BPF_MOV64_IMM(BPF_REG_4, -1),
BPF_MOV64_IMM(BPF_REG_5, -1),
BPF_MOV64_IMM(BPF_REG_6, -1),
BPF_MOV64_IMM(BPF_REG_7, -1),
BPF_MOV64_IMM(BPF_REG_8, -1),
/* Store both R9 and R10 with BPF_B and read back. */
BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_10, 0),
BPF_LDX_MEM(BPF_B, BPF_REG_2, BPF_REG_1, 0),
BPF_STX_MEM(BPF_B, BPF_REG_1, BPF_REG_9, 0),
BPF_LDX_MEM(BPF_B, BPF_REG_3, BPF_REG_1, 0),
/* Should read back as same value. */
BPF_JMP_REG(BPF_JEQ, BPF_REG_2, BPF_REG_3, 2),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 42),
BPF_EXIT_INSN(),
},
.fixup_map_array_48b = { 3 },
.result = ACCEPT,
.retval = 42,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},

1
tools/testing/selftests/bpf/verifier/value_illegal_alu.c
View File

@ -88,6 +88,7 @@
BPF_EXIT_INSN(),
},
.fixup_map_hash_48b = { 3 },
.errstr_unpriv = "leaking pointer from stack off -8",
.errstr = "R0 invalid mem access 'inv'",
.result = REJECT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,