Merge branch 'bpf-misc'

Daniel Borkmann says:

====================
Misc BPF improvements

This series adds various misc improvements to BPF, f.e. allowing
skb_load_bytes() helper to be used with filter/reuseport programs
to facilitate programming, test cases for program tag, etc. For
details, please see individual patches.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/bpf.h

@@ -522,6 +522,7 @@ enum bpf_func_id {
 /* BPF_FUNC_l4_csum_replace flags. */
 #define BPF_F_PSEUDO_HDR		(1ULL << 4)
 #define BPF_F_MARK_MANGLED_0		(1ULL << 5)
+#define BPF_F_MARK_ENFORCE		(1ULL << 6)
 
 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
 #define BPF_F_INGRESS			(1ULL << 0)

kernel/bpf/verifier.c

@@ -1566,22 +1566,54 @@ static int evaluate_reg_imm_alu(struct bpf_verifier_env *env,
 	struct bpf_reg_state *dst_reg = &regs[insn->dst_reg];
 	struct bpf_reg_state *src_reg = &regs[insn->src_reg];
 	u8 opcode = BPF_OP(insn->code);
+	u64 dst_imm = dst_reg->imm;
 
-	/* dst_reg->type == CONST_IMM here, simulate execution of 'add'/'or'
-	 * insn. Don't care about overflow or negative values, just add them
+	/* dst_reg->type == CONST_IMM here. Simulate execution of insns
+	 * containing ALU ops. Don't care about overflow or negative
+	 * values, just add/sub/... them; registers are in u64.
 	 */
-	if (opcode == BPF_ADD && BPF_SRC(insn->code) == BPF_K)
-		dst_reg->imm += insn->imm;
-	else if (opcode == BPF_ADD && BPF_SRC(insn->code) == BPF_X &&
-		 src_reg->type == CONST_IMM)
-		dst_reg->imm += src_reg->imm;
-	else if (opcode == BPF_OR && BPF_SRC(insn->code) == BPF_K)
-		dst_reg->imm |= insn->imm;
-	else if (opcode == BPF_OR && BPF_SRC(insn->code) == BPF_X &&
-		 src_reg->type == CONST_IMM)
-		dst_reg->imm |= src_reg->imm;
-	else
+	if (opcode == BPF_ADD && BPF_SRC(insn->code) == BPF_K) {
+		dst_imm += insn->imm;
+	} else if (opcode == BPF_ADD && BPF_SRC(insn->code) == BPF_X &&
+		   src_reg->type == CONST_IMM) {
+		dst_imm += src_reg->imm;
+	} else if (opcode == BPF_SUB && BPF_SRC(insn->code) == BPF_K) {
+		dst_imm -= insn->imm;
+	} else if (opcode == BPF_SUB && BPF_SRC(insn->code) == BPF_X &&
+		   src_reg->type == CONST_IMM) {
+		dst_imm -= src_reg->imm;
+	} else if (opcode == BPF_MUL && BPF_SRC(insn->code) == BPF_K) {
+		dst_imm *= insn->imm;
+	} else if (opcode == BPF_MUL && BPF_SRC(insn->code) == BPF_X &&
+		   src_reg->type == CONST_IMM) {
+		dst_imm *= src_reg->imm;
+	} else if (opcode == BPF_OR && BPF_SRC(insn->code) == BPF_K) {
+		dst_imm |= insn->imm;
+	} else if (opcode == BPF_OR && BPF_SRC(insn->code) == BPF_X &&
+		   src_reg->type == CONST_IMM) {
+		dst_imm |= src_reg->imm;
+	} else if (opcode == BPF_AND && BPF_SRC(insn->code) == BPF_K) {
+		dst_imm &= insn->imm;
+	} else if (opcode == BPF_AND && BPF_SRC(insn->code) == BPF_X &&
+		   src_reg->type == CONST_IMM) {
+		dst_imm &= src_reg->imm;
+	} else if (opcode == BPF_RSH && BPF_SRC(insn->code) == BPF_K) {
+		dst_imm >>= insn->imm;
+	} else if (opcode == BPF_RSH && BPF_SRC(insn->code) == BPF_X &&
+		   src_reg->type == CONST_IMM) {
+		dst_imm >>= src_reg->imm;
+	} else if (opcode == BPF_LSH && BPF_SRC(insn->code) == BPF_K) {
+		dst_imm <<= insn->imm;
+	} else if (opcode == BPF_LSH && BPF_SRC(insn->code) == BPF_X &&
+		   src_reg->type == CONST_IMM) {
+		dst_imm <<= src_reg->imm;
+	} else {
 		mark_reg_unknown_value(regs, insn->dst_reg);
+		goto out;
+	}
+
+	dst_reg->imm = dst_imm;
+out:
 	return 0;
 }
 
@@ -2225,14 +2257,8 @@ static int check_ld_imm(struct bpf_verifier_env *env, struct bpf_insn *insn)
 		return err;
 
 	if (insn->src_reg == 0) {
-		/* generic move 64-bit immediate into a register,
-		 * only analyzer needs to collect the ld_imm value.
-		 */
 		u64 imm = ((u64)(insn + 1)->imm << 32) | (u32)insn->imm;
 
-		if (!env->analyzer_ops)
-			return 0;
-
 		regs[insn->dst_reg].type = CONST_IMM;
 		regs[insn->dst_reg].imm = imm;
 		return 0;

net/core/filter.c

@@ -1522,10 +1522,11 @@ BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
 {
 	bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
 	bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
+	bool do_mforce = flags & BPF_F_MARK_ENFORCE;
 	__sum16 *ptr;
 
-	if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_PSEUDO_HDR |
-			       BPF_F_HDR_FIELD_MASK)))
+	if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
+			       BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
 		return -EINVAL;
 	if (unlikely(offset > 0xffff || offset & 1))
 		return -EFAULT;
@@ -1533,7 +1534,7 @@ BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
 		return -EFAULT;
 
 	ptr = (__sum16 *)(skb->data + offset);
-	if (is_mmzero && !*ptr)
+	if (is_mmzero && !do_mforce && !*ptr)
 		return 0;
 
 	switch (flags & BPF_F_HDR_FIELD_MASK) {
@@ -2598,7 +2599,7 @@ static const struct bpf_func_proto bpf_xdp_event_output_proto = {
 };
 
 static const struct bpf_func_proto *
-sk_filter_func_proto(enum bpf_func_id func_id)
+bpf_base_func_proto(enum bpf_func_id func_id)
 {
 	switch (func_id) {
 	case BPF_FUNC_map_lookup_elem:
@@ -2625,6 +2626,17 @@ sk_filter_func_proto(enum bpf_func_id func_id)
 	}
 }
 
+static const struct bpf_func_proto *
+sk_filter_func_proto(enum bpf_func_id func_id)
+{
+	switch (func_id) {
+	case BPF_FUNC_skb_load_bytes:
+		return &bpf_skb_load_bytes_proto;
+	default:
+		return bpf_base_func_proto(func_id);
+	}
+}
+
 static const struct bpf_func_proto *
 tc_cls_act_func_proto(enum bpf_func_id func_id)
 {
@@ -2680,7 +2692,7 @@ tc_cls_act_func_proto(enum bpf_func_id func_id)
 	case BPF_FUNC_skb_under_cgroup:
 		return &bpf_skb_under_cgroup_proto;
 	default:
-		return sk_filter_func_proto(func_id);
+		return bpf_base_func_proto(func_id);
 	}
 }
 
@@ -2695,7 +2707,7 @@ xdp_func_proto(enum bpf_func_id func_id)
 	case BPF_FUNC_xdp_adjust_head:
 		return &bpf_xdp_adjust_head_proto;
 	default:
-		return sk_filter_func_proto(func_id);
+		return bpf_base_func_proto(func_id);
 	}
 }
 
@@ -2706,7 +2718,7 @@ cg_skb_func_proto(enum bpf_func_id func_id)
 	case BPF_FUNC_skb_load_bytes:
 		return &bpf_skb_load_bytes_proto;
 	default:
-		return sk_filter_func_proto(func_id);
+		return bpf_base_func_proto(func_id);
 	}
 }
 
@@ -2733,7 +2745,7 @@ lwt_inout_func_proto(enum bpf_func_id func_id)
 	case BPF_FUNC_skb_under_cgroup:
 		return &bpf_skb_under_cgroup_proto;
 	default:
-		return sk_filter_func_proto(func_id);
+		return bpf_base_func_proto(func_id);
 	}
 }
 
@@ -2784,19 +2796,8 @@ static bool __is_valid_access(int off, int size)
 	switch (off) {
 	case offsetof(struct __sk_buff, cb[0]) ...
 	     offsetof(struct __sk_buff, cb[4]) + sizeof(__u32) - 1:
-		if (size == sizeof(__u16) &&
-		    off > offsetof(struct __sk_buff, cb[4]) + sizeof(__u16))
-			return false;
-		if (size == sizeof(__u32) &&
-		    off > offsetof(struct __sk_buff, cb[4]))
-			return false;
-		if (size == sizeof(__u64) &&
-		    off > offsetof(struct __sk_buff, cb[2]))
-			return false;
-		if (size != sizeof(__u8)  &&
-		    size != sizeof(__u16) &&
-		    size != sizeof(__u32) &&
-		    size != sizeof(__u64))
+		if (off + size >
+		    offsetof(struct __sk_buff, cb[4]) + sizeof(__u32))
 			return false;
 		break;
 	default:
@@ -2994,10 +2995,10 @@ void bpf_warn_invalid_xdp_action(u32 act)
 }
 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
 
-static u32 sk_filter_convert_ctx_access(enum bpf_access_type type,
-					const struct bpf_insn *si,
-					struct bpf_insn *insn_buf,
-					struct bpf_prog *prog)
+static u32 bpf_convert_ctx_access(enum bpf_access_type type,
+				  const struct bpf_insn *si,
+				  struct bpf_insn *insn_buf,
+				  struct bpf_prog *prog)
 {
 	struct bpf_insn *insn = insn_buf;
 	int off;
@@ -3221,7 +3222,7 @@ static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
 				      offsetof(struct net_device, ifindex));
 		break;
 	default:
-		return sk_filter_convert_ctx_access(type, si, insn_buf, prog);
+		return bpf_convert_ctx_access(type, si, insn_buf, prog);
 	}
 
 	return insn - insn_buf;
@@ -3253,7 +3254,7 @@ static u32 xdp_convert_ctx_access(enum bpf_access_type type,
 static const struct bpf_verifier_ops sk_filter_ops = {
 	.get_func_proto		= sk_filter_func_proto,
 	.is_valid_access	= sk_filter_is_valid_access,
-	.convert_ctx_access	= sk_filter_convert_ctx_access,
+	.convert_ctx_access	= bpf_convert_ctx_access,
 };
 
 static const struct bpf_verifier_ops tc_cls_act_ops = {
@@ -3272,24 +3273,24 @@ static const struct bpf_verifier_ops xdp_ops = {
 static const struct bpf_verifier_ops cg_skb_ops = {
 	.get_func_proto		= cg_skb_func_proto,
 	.is_valid_access	= sk_filter_is_valid_access,
-	.convert_ctx_access	= sk_filter_convert_ctx_access,
+	.convert_ctx_access	= bpf_convert_ctx_access,
 };
 
 static const struct bpf_verifier_ops lwt_inout_ops = {
 	.get_func_proto		= lwt_inout_func_proto,
 	.is_valid_access	= lwt_is_valid_access,
-	.convert_ctx_access	= sk_filter_convert_ctx_access,
+	.convert_ctx_access	= bpf_convert_ctx_access,
 };
 
 static const struct bpf_verifier_ops lwt_xmit_ops = {
 	.get_func_proto		= lwt_xmit_func_proto,
 	.is_valid_access	= lwt_is_valid_access,
-	.convert_ctx_access	= sk_filter_convert_ctx_access,
+	.convert_ctx_access	= bpf_convert_ctx_access,
 	.gen_prologue		= tc_cls_act_prologue,
 };
 
 static const struct bpf_verifier_ops cg_sock_ops = {
-	.get_func_proto		= sk_filter_func_proto,
+	.get_func_proto		= bpf_base_func_proto,
 	.is_valid_access	= sock_filter_is_valid_access,
 	.convert_ctx_access	= sock_filter_convert_ctx_access,
 };

tools/testing/selftests/bpf/Makefile

 CFLAGS += -Wall -O2 -I../../../../usr/include
 
-test_objs = test_verifier test_maps test_lru_map test_lpm_map
+test_objs = test_verifier test_tag test_maps test_lru_map test_lpm_map
 
-TEST_PROGS := test_verifier test_maps test_lru_map test_lpm_map test_kmod.sh
+TEST_PROGS := $(test_objs) test_kmod.sh
 TEST_FILES := $(test_objs)
 
 all: $(test_objs)

tools/testing/selftests/bpf/test_tag.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <time.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <sched.h>
+#include <limits.h>
+#include <assert.h>
+
+#include <sys/socket.h>
+#include <sys/resource.h>
+
+#include <linux/filter.h>
+#include <linux/bpf.h>
+#include <linux/if_alg.h>
+
+#include "../../../include/linux/filter.h"
+
+#include "bpf_sys.h"
+
+static struct bpf_insn prog[BPF_MAXINSNS];
+
+static void bpf_gen_imm_prog(unsigned int insns, int fd_map)
+{
+	int i;
+
+	srand(time(NULL));
+	for (i = 0; i < insns; i++)
+		prog[i] = BPF_ALU64_IMM(BPF_MOV, i % BPF_REG_10, rand());
+	prog[i - 1] = BPF_EXIT_INSN();
+}
+
+static void bpf_gen_map_prog(unsigned int insns, int fd_map)
+{
+	int i, j = 0;
+
+	for (i = 0; i + 1 < insns; i += 2) {
+		struct bpf_insn tmp[] = {
+			BPF_LD_MAP_FD(j++ % BPF_REG_10, fd_map)
+		};
+
+		memcpy(&prog[i], tmp, sizeof(tmp));
+	}
+	if (insns % 2 == 0)
+		prog[insns - 2] = BPF_ALU64_IMM(BPF_MOV, i % BPF_REG_10, 42);
+	prog[insns - 1] = BPF_EXIT_INSN();
+}
+
+static int bpf_try_load_prog(int insns, int fd_map,
+			     void (*bpf_filler)(unsigned int insns,
+						int fd_map))
+{
+	int fd_prog;
+
+	bpf_filler(insns, fd_map);
+	fd_prog = bpf_prog_load(BPF_PROG_TYPE_SCHED_CLS, prog, insns *
+				sizeof(struct bpf_insn), "", NULL, 0);
+	assert(fd_prog > 0);
+	if (fd_map > 0)
+		bpf_filler(insns, 0);
+	return fd_prog;
+}
+
+static int __hex2bin(char ch)
+{
+	if ((ch >= '0') && (ch <= '9'))
+		return ch - '0';
+	ch = tolower(ch);
+	if ((ch >= 'a') && (ch <= 'f'))
+		return ch - 'a' + 10;
+	return -1;
+}
+
+static int hex2bin(uint8_t *dst, const char *src, size_t count)
+{
+	while (count--) {
+		int hi = __hex2bin(*src++);
+		int lo = __hex2bin(*src++);
+
+		if ((hi < 0) || (lo < 0))
+			return -1;
+		*dst++ = (hi << 4) | lo;
+	}
+	return 0;
+}
+
+static void tag_from_fdinfo(int fd_prog, uint8_t *tag, uint32_t len)
+{
+	const int prefix_len = sizeof("prog_tag:\t") - 1;
+	char buff[256];
+	int ret = -1;
+	FILE *fp;
+
+	snprintf(buff, sizeof(buff), "/proc/%d/fdinfo/%d", getpid(),
+		 fd_prog);
+	fp = fopen(buff, "r");
+	assert(fp);
+
+	while (fgets(buff, sizeof(buff), fp)) {
+		if (strncmp(buff, "prog_tag:\t", len))
+			continue;
+		ret = hex2bin(tag, buff + prefix_len, len);
+		break;
+	}
+
+	fclose(fp);
+	assert(!ret);
+}
+
+static void tag_from_alg(int insns, uint8_t *tag, uint32_t len)
+{
+	static const struct sockaddr_alg alg = {
+		.salg_family	= AF_ALG,
+		.salg_type	= "hash",
+		.salg_name	= "sha1",
+	};
+	int fd_base, fd_alg, ret;
+	ssize_t size;
+
+	fd_base = socket(AF_ALG, SOCK_SEQPACKET, 0);
+	assert(fd_base > 0);
+
+	ret = bind(fd_base, (struct sockaddr *)&alg, sizeof(alg));
+	assert(!ret);
+
+	fd_alg = accept(fd_base, NULL, 0);
+	assert(fd_alg > 0);
+
+	insns *= sizeof(struct bpf_insn);
+	size = write(fd_alg, prog, insns);
+	assert(size == insns);
+
+	size = read(fd_alg, tag, len);
+	assert(size == len);
+
+	close(fd_alg);
+	close(fd_base);
+}
+
+static void tag_dump(const char *prefix, uint8_t *tag, uint32_t len)
+{
+	int i;
+
+	printf("%s", prefix);
+	for (i = 0; i < len; i++)
+		printf("%02x", tag[i]);
+	printf("\n");
+}
+
+static void tag_exit_report(int insns, int fd_map, uint8_t *ftag,
+			    uint8_t *atag, uint32_t len)
+{
+	printf("Program tag mismatch for %d insns%s!\n", insns,
+	       fd_map < 0 ? "" : " with map");
+
+	tag_dump("  fdinfo result: ", ftag, len);
+	tag_dump("  af_alg result: ", atag, len);
+	exit(1);
+}
+
+static void do_test(uint32_t *tests, int start_insns, int fd_map,
+		    void (*bpf_filler)(unsigned int insns, int fd))
+{
+	int i, fd_prog;
+
+	for (i = start_insns; i <= BPF_MAXINSNS; i++) {
+		uint8_t ftag[8], atag[sizeof(ftag)];
+
+		fd_prog = bpf_try_load_prog(i, fd_map, bpf_filler);
+		tag_from_fdinfo(fd_prog, ftag, sizeof(ftag));
+		tag_from_alg(i, atag, sizeof(atag));
+		if (memcmp(ftag, atag, sizeof(ftag)))
+			tag_exit_report(i, fd_map, ftag, atag, sizeof(ftag));
+
+		close(fd_prog);
+		sched_yield();
+		(*tests)++;
+	}
+}
+
+int main(void)
+{
+	struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
+	uint32_t tests = 0;
+	int i, fd_map;
+
+	setrlimit(RLIMIT_MEMLOCK, &rinf);
+	fd_map = bpf_map_create(BPF_MAP_TYPE_HASH, sizeof(int),
+				sizeof(int), 1, BPF_F_NO_PREALLOC);
+	assert(fd_map > 0);
+
+	for (i = 0; i < 5; i++) {
+		do_test(&tests, 2, -1,     bpf_gen_imm_prog);
+		do_test(&tests, 3, fd_map, bpf_gen_map_prog);
+	}
+
+	printf("test_tag: OK (%u tests)\n", tests);
+	close(fd_map);
+	return 0;
+}

tools/testing/selftests/bpf/test_verifier.c

@@ -2325,6 +2325,84 @@ static struct bpf_test tests[] = {
 		.result = REJECT,
 		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
 	},
+	{
+		"direct packet access: test11 (shift, good access)",
+		.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, 22),
+			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 8),
+			BPF_MOV64_IMM(BPF_REG_3, 144),
+			BPF_MOV64_REG(BPF_REG_5, BPF_REG_3),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 23),
+			BPF_ALU64_IMM(BPF_RSH, BPF_REG_5, 3),
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_2),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_5),
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.result = ACCEPT,
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+	},
+	{
+		"direct packet access: test12 (and, good access)",
+		.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, 22),
+			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 8),
+			BPF_MOV64_IMM(BPF_REG_3, 144),
+			BPF_MOV64_REG(BPF_REG_5, BPF_REG_3),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 23),
+			BPF_ALU64_IMM(BPF_AND, BPF_REG_5, 15),
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_2),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_5),
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.result = ACCEPT,
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+	},
+	{
+		"direct packet access: test13 (branches, good access)",
+		.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, 22),
+			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 13),
+			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
+				    offsetof(struct __sk_buff, mark)),
+			BPF_MOV64_IMM(BPF_REG_4, 1),
+			BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_4, 2),
+			BPF_MOV64_IMM(BPF_REG_3, 14),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_3, 24),
+			BPF_MOV64_REG(BPF_REG_5, BPF_REG_3),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 23),
+			BPF_ALU64_IMM(BPF_AND, BPF_REG_5, 15),
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_2),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_5),
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.result = ACCEPT,
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+	},
 	{
 		"helper access to packet: test1, valid packet_ptr range",
 		.insns = {
@@ -4208,6 +4286,8 @@ static struct bpf_test tests[] = {
 		.insns = {
 			BPF_MOV64_IMM(BPF_REG_1, 0),
 			BPF_MOV64_IMM(BPF_REG_2, 0),
+			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -128),
+			BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -128),
 			BPF_ALU64_IMM(BPF_AND, BPF_REG_2, 64),
 			BPF_MOV64_IMM(BPF_REG_3, 0),
 			BPF_MOV64_IMM(BPF_REG_4, 0),
@@ -4251,6 +4331,8 @@ static struct bpf_test tests[] = {
 			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
 			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
 			BPF_MOV64_IMM(BPF_REG_2, 0),
+			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -128),
+			BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -128),
 			BPF_ALU64_IMM(BPF_AND, BPF_REG_2, 63),
 			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, 1),
 			BPF_MOV64_IMM(BPF_REG_3, 0),