[v5,01/10] bpf: Add eBPF program subtype and is_valid_subtype() verifier

Commit Message

Mickaël Salaün Feb. 22, 2017, 1:26 a.m. UTC

The goal of the program subtype is to be able to have different static
fine-grained verifications for a unique program type.

The struct bpf_verifier_ops gets a new optional function:
is_valid_subtype(). This new verifier is called at the beginning of the
eBPF program verification to check if the (optional) program subtype is
valid.

For now, only Landlock eBPF programs are using a program subtype (see
next commit) but this could be used by other program types in the future.

Changes since v4:
* replace the "status" field with "version" (more generic)
* replace the "access" field with "ability" (less confusing)

Changes since v3:
* remove the "origin" field
* add an "option" field
* cleanup comments

Signed-off-by: Mickaël Salaün <[e-mail]>
Cc: Alexei Starovoitov <[e-mail]>
Cc: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Daniel Borkmann <[e-mail]>
Cc: David S. Miller <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]
---
 include/linux/bpf.h                         |  7 +++--
 include/linux/filter.h                      |  1 +
 include/uapi/linux/bpf.h                    | 10 ++++++
 kernel/bpf/syscall.c                        |  5 +--
 kernel/bpf/verifier.c                       | 10 ++++--
 kernel/trace/bpf_trace.c                    | 15 ++++++---
 net/core/filter.c                           | 48 ++++++++++++++++++-----------
 samples/bpf/bpf_load.c                      |  3 +-
 samples/bpf/fds_example.c                   |  2 +-
 samples/bpf/sock_example.c                  |  2 +-
 samples/bpf/test_cgrp2_attach.c             |  2 +-
 samples/bpf/test_cgrp2_attach2.c            |  2 +-
 samples/bpf/test_cgrp2_sock.c               |  2 +-
 tools/include/uapi/linux/bpf.h              | 10 ++++++
 tools/lib/bpf/bpf.c                         |  5 ++-
 tools/lib/bpf/bpf.h                         |  2 +-
 tools/lib/bpf/libbpf.c                      |  4 +--
 tools/perf/tests/bpf.c                      |  2 +-
 tools/testing/selftests/bpf/test_tag.c      |  2 +-
 tools/testing/selftests/bpf/test_verifier.c |  3 +-
 20 files changed, 95 insertions(+), 42 deletions(-)

Patch

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 909fc033173a..dd954048aa19 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -154,19 +154,22 @@  struct bpf_prog;
 
 struct bpf_verifier_ops {
 	/* return eBPF function prototype for verification */
-	const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);
+	const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id,
+				      union bpf_prog_subtype *prog_subtype);
 
 	/* return true if 'size' wide access at offset 'off' within bpf_context
 	 * with 'type' (read or write) is allowed
 	 */
 	bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
-				enum bpf_reg_type *reg_type);
+				enum bpf_reg_type *reg_type,
+				union bpf_prog_subtype *prog_subtype);
 	int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
 			    const struct bpf_prog *prog);
 	u32 (*convert_ctx_access)(enum bpf_access_type type,
 				  const struct bpf_insn *src,
 				  struct bpf_insn *dst,
 				  struct bpf_prog *prog);
+	bool (*is_valid_subtype)(union bpf_prog_subtype *prog_subtype);
 };
 
 struct bpf_prog_type_list {
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 0c167fdee5f7..1f49b19a87c1 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -417,6 +417,7 @@  struct bpf_prog {
 	enum bpf_prog_type	type;		/* Type of BPF program */
 	u32			len;		/* Number of filter blocks */
 	u8			tag[BPF_TAG_SIZE];
+	union bpf_prog_subtype	subtype;	/* For fine-grained verifications */
 	struct bpf_prog_aux	*aux;		/* Auxiliary fields */
 	struct sock_fprog_kern	*orig_prog;	/* Original BPF program */
 	unsigned int		(*bpf_func)(const void *ctx,
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 0539a0ceef38..240c76f09d0d 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -145,6 +145,15 @@  enum bpf_attach_type {
  */
 #define BPF_F_NO_COMMON_LRU	(1U << 1)
 
+union bpf_prog_subtype {
+	struct {
+		__u32		version; /* cf. documentation */
+		__u32		event; /* enum landlock_subtype_event */
+		__aligned_u64	ability; /* LANDLOCK_SUBTYPE_ABILITY_* */
+		__aligned_u64	option; /* LANDLOCK_SUBTYPE_OPTION_* */
+	} landlock_rule;
+} __attribute__((aligned(8)));
+
 union bpf_attr {
 	struct { /* anonymous struct used by BPF_MAP_CREATE command */
 		__u32	map_type;	/* one of enum bpf_map_type */
@@ -173,6 +182,7 @@  union bpf_attr {
 		__u32		log_size;	/* size of user buffer */
 		__aligned_u64	log_buf;	/* user supplied buffer */
 		__u32		kern_version;	/* checked when prog_type=kprobe */
+		union bpf_prog_subtype prog_subtype;
 	};
 
 	struct { /* anonymous struct used by BPF_OBJ_* commands */
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 461eb1e66a0f..23f7ca14e898 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -628,7 +628,7 @@  static void fixup_bpf_calls(struct bpf_prog *prog)
 				continue;
 			}
 
-			fn = prog->aux->ops->get_func_proto(insn->imm);
+			fn = prog->aux->ops->get_func_proto(insn->imm, &prog->subtype);
 			/* all functions that have prototype and verifier allowed
 			 * programs to call them, must be real in-kernel functions
 			 */
@@ -827,7 +827,7 @@  struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type)
 EXPORT_SYMBOL_GPL(bpf_prog_get_type);
 
 /* last field in 'union bpf_attr' used by this command */
-#define	BPF_PROG_LOAD_LAST_FIELD kern_version
+#define	BPF_PROG_LOAD_LAST_FIELD prog_subtype
 
 static int bpf_prog_load(union bpf_attr *attr)
 {
@@ -885,6 +885,7 @@  static int bpf_prog_load(union bpf_attr *attr)
 	err = find_prog_type(type, prog);
 	if (err < 0)
 		goto free_prog;
+	prog->subtype = attr->prog_subtype;
 
 	/* run eBPF verifier */
 	err = bpf_check(&prog, attr);
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index d2bded2b250c..fe26ec007a9a 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -740,7 +740,8 @@  static int check_ctx_access(struct bpf_verifier_env *env, int off, int size,
 		return 0;
 
 	if (env->prog->aux->ops->is_valid_access &&
-	    env->prog->aux->ops->is_valid_access(off, size, t, reg_type)) {
+	    env->prog->aux->ops->is_valid_access(off, size, t, reg_type,
+					         &env->prog->subtype)) {
 		/* remember the offset of last byte accessed in ctx */
 		if (env->prog->aux->max_ctx_offset < off + size)
 			env->prog->aux->max_ctx_offset = off + size;
@@ -1290,7 +1291,8 @@  static int check_call(struct bpf_verifier_env *env, int func_id)
 	}
 
 	if (env->prog->aux->ops->get_func_proto)
-		fn = env->prog->aux->ops->get_func_proto(func_id);
+		fn = env->prog->aux->ops->get_func_proto(func_id,
+							 &env->prog->subtype);
 
 	if (!fn) {
 		verbose("unknown func %s#%d\n", func_id_name(func_id), func_id);
@@ -3261,6 +3263,10 @@  int bpf_check(struct bpf_prog **prog, union bpf_attr *attr)
 	struct bpf_verifier_env *env;
 	int ret = -EINVAL;
 
+	if ((*prog)->aux->ops->is_valid_subtype &&
+	    !(*prog)->aux->ops->is_valid_subtype(&(*prog)->subtype))
+		return -EINVAL;
+
 	/* 'struct bpf_verifier_env' can be global, but since it's not small,
 	 * allocate/free it every time bpf_check() is called
 	 */
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index cee9802cf3e0..e71ee1bb7abf 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -469,7 +469,8 @@  static const struct bpf_func_proto *tracing_func_proto(enum bpf_func_id func_id)
 	}
 }
 
-static const struct bpf_func_proto *kprobe_prog_func_proto(enum bpf_func_id func_id)
+static const struct bpf_func_proto *kprobe_prog_func_proto(enum bpf_func_id func_id,
+		union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_perf_event_output:
@@ -483,7 +484,8 @@  static const struct bpf_func_proto *kprobe_prog_func_proto(enum bpf_func_id func
 
 /* bpf+kprobe programs can access fields of 'struct pt_regs' */
 static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type type,
-					enum bpf_reg_type *reg_type)
+					enum bpf_reg_type *reg_type,
+					union bpf_prog_subtype *prog_subtype)
 {
 	if (off < 0 || off >= sizeof(struct pt_regs))
 		return false;
@@ -558,7 +560,8 @@  static const struct bpf_func_proto bpf_get_stackid_proto_tp = {
 	.arg3_type	= ARG_ANYTHING,
 };
 
-static const struct bpf_func_proto *tp_prog_func_proto(enum bpf_func_id func_id)
+static const struct bpf_func_proto *tp_prog_func_proto(enum bpf_func_id func_id,
+		union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_perf_event_output:
@@ -571,7 +574,8 @@  static const struct bpf_func_proto *tp_prog_func_proto(enum bpf_func_id func_id)
 }
 
 static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type,
-				    enum bpf_reg_type *reg_type)
+				    enum bpf_reg_type *reg_type,
+				    union bpf_prog_subtype *prog_subtype)
 {
 	if (off < sizeof(void *) || off >= PERF_MAX_TRACE_SIZE)
 		return false;
@@ -595,7 +599,8 @@  static struct bpf_prog_type_list tracepoint_tl __ro_after_init = {
 };
 
 static bool pe_prog_is_valid_access(int off, int size, enum bpf_access_type type,
-				    enum bpf_reg_type *reg_type)
+				    enum bpf_reg_type *reg_type,
+				    union bpf_prog_subtype *prog_subtype)
 {
 	if (off < 0 || off >= sizeof(struct bpf_perf_event_data))
 		return false;
diff --git a/net/core/filter.c b/net/core/filter.c
index e466e0040137..ac25920b5eae 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2600,7 +2600,8 @@  static const struct bpf_func_proto bpf_xdp_event_output_proto = {
 };
 
 static const struct bpf_func_proto *
-bpf_base_func_proto(enum bpf_func_id func_id)
+bpf_base_func_proto(enum bpf_func_id func_id,
+		    union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_map_lookup_elem:
@@ -2628,18 +2629,20 @@  bpf_base_func_proto(enum bpf_func_id func_id)
 }
 
 static const struct bpf_func_proto *
-sk_filter_func_proto(enum bpf_func_id func_id)
+sk_filter_func_proto(enum bpf_func_id func_id,
+		     union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_skb_load_bytes:
 		return &bpf_skb_load_bytes_proto;
 	default:
-		return bpf_base_func_proto(func_id);
+		return bpf_base_func_proto(func_id, prog_subtype);
 	}
 }
 
 static const struct bpf_func_proto *
-tc_cls_act_func_proto(enum bpf_func_id func_id)
+tc_cls_act_func_proto(enum bpf_func_id func_id,
+		      union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_skb_store_bytes:
@@ -2693,12 +2696,13 @@  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 bpf_base_func_proto(func_id);
+		return bpf_base_func_proto(func_id, prog_subtype);
 	}
 }
 
 static const struct bpf_func_proto *
-xdp_func_proto(enum bpf_func_id func_id)
+xdp_func_proto(enum bpf_func_id func_id,
+	       union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_perf_event_output:
@@ -2708,23 +2712,25 @@  xdp_func_proto(enum bpf_func_id func_id)
 	case BPF_FUNC_xdp_adjust_head:
 		return &bpf_xdp_adjust_head_proto;
 	default:
-		return bpf_base_func_proto(func_id);
+		return bpf_base_func_proto(func_id, prog_subtype);
 	}
 }
 
 static const struct bpf_func_proto *
-cg_skb_func_proto(enum bpf_func_id func_id)
+cg_skb_func_proto(enum bpf_func_id func_id,
+		  union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_skb_load_bytes:
 		return &bpf_skb_load_bytes_proto;
 	default:
-		return bpf_base_func_proto(func_id);
+		return bpf_base_func_proto(func_id, prog_subtype);
 	}
 }
 
 static const struct bpf_func_proto *
-lwt_inout_func_proto(enum bpf_func_id func_id)
+lwt_inout_func_proto(enum bpf_func_id func_id,
+		     union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_skb_load_bytes:
@@ -2746,12 +2752,13 @@  lwt_inout_func_proto(enum bpf_func_id func_id)
 	case BPF_FUNC_skb_under_cgroup:
 		return &bpf_skb_under_cgroup_proto;
 	default:
-		return bpf_base_func_proto(func_id);
+		return bpf_base_func_proto(func_id, prog_subtype);
 	}
 }
 
 static const struct bpf_func_proto *
-lwt_xmit_func_proto(enum bpf_func_id func_id)
+lwt_xmit_func_proto(enum bpf_func_id func_id,
+		    union bpf_prog_subtype *prog_subtype)
 {
 	switch (func_id) {
 	case BPF_FUNC_skb_get_tunnel_key:
@@ -2781,7 +2788,7 @@  lwt_xmit_func_proto(enum bpf_func_id func_id)
 	case BPF_FUNC_set_hash_invalid:
 		return &bpf_set_hash_invalid_proto;
 	default:
-		return lwt_inout_func_proto(func_id);
+		return lwt_inout_func_proto(func_id, prog_subtype);
 	}
 }
 
@@ -2811,7 +2818,8 @@  static bool __is_valid_access(int off, int size)
 
 static bool sk_filter_is_valid_access(int off, int size,
 				      enum bpf_access_type type,
-				      enum bpf_reg_type *reg_type)
+				      enum bpf_reg_type *reg_type,
+				      union bpf_prog_subtype *prog_subtype)
 {
 	switch (off) {
 	case offsetof(struct __sk_buff, tc_classid):
@@ -2835,7 +2843,8 @@  static bool sk_filter_is_valid_access(int off, int size,
 
 static bool lwt_is_valid_access(int off, int size,
 				enum bpf_access_type type,
-				enum bpf_reg_type *reg_type)
+				enum bpf_reg_type *reg_type,
+				union bpf_prog_subtype *prog_subtype)
 {
 	switch (off) {
 	case offsetof(struct __sk_buff, tc_classid):
@@ -2868,7 +2877,8 @@  static bool lwt_is_valid_access(int off, int size,
 
 static bool sock_filter_is_valid_access(int off, int size,
 					enum bpf_access_type type,
-					enum bpf_reg_type *reg_type)
+					enum bpf_reg_type *reg_type,
+					union bpf_prog_subtype *prog_subtype)
 {
 	if (type == BPF_WRITE) {
 		switch (off) {
@@ -2931,7 +2941,8 @@  static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
 
 static bool tc_cls_act_is_valid_access(int off, int size,
 				       enum bpf_access_type type,
-				       enum bpf_reg_type *reg_type)
+				       enum bpf_reg_type *reg_type,
+				       union bpf_prog_subtype *prog_subtype)
 {
 	if (type == BPF_WRITE) {
 		switch (off) {
@@ -2973,7 +2984,8 @@  static bool __is_valid_xdp_access(int off, int size)
 
 static bool xdp_is_valid_access(int off, int size,
 				enum bpf_access_type type,
-				enum bpf_reg_type *reg_type)
+				enum bpf_reg_type *reg_type,
+				union bpf_prog_subtype *prog_subtype)
 {
 	if (type == BPF_WRITE)
 		return false;
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index 396e204888b3..d23dc13ab0f2 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -29,6 +29,7 @@ 
 
 static char license[128];
 static int kern_version;
+static union bpf_prog_subtype subtype = {};
 static bool processed_sec[128];
 char bpf_log_buf[BPF_LOG_BUF_SIZE];
 int map_fd[MAX_MAPS];
@@ -98,7 +99,7 @@  static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
 	}
 
 	fd = bpf_load_program(prog_type, prog, insns_cnt, license, kern_version,
-			      bpf_log_buf, BPF_LOG_BUF_SIZE);
+			      bpf_log_buf, BPF_LOG_BUF_SIZE, &subtype);
 	if (fd < 0) {
 		printf("bpf_load_program() err=%d\n%s", errno, bpf_log_buf);
 		return -1;
diff --git a/samples/bpf/fds_example.c b/samples/bpf/fds_example.c
index e29bd52ff9e8..0f4f5f6a9f9f 100644
--- a/samples/bpf/fds_example.c
+++ b/samples/bpf/fds_example.c
@@ -62,7 +62,7 @@  static int bpf_prog_create(const char *object)
 	} else {
 		return bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER,
 					insns, insns_cnt, "GPL", 0,
-					bpf_log_buf, BPF_LOG_BUF_SIZE);
+					bpf_log_buf, BPF_LOG_BUF_SIZE, NULL);
 	}
 }
 
diff --git a/samples/bpf/sock_example.c b/samples/bpf/sock_example.c
index 6fc6e193ef1b..615f4d8c29dc 100644
--- a/samples/bpf/sock_example.c
+++ b/samples/bpf/sock_example.c
@@ -60,7 +60,7 @@  static int test_sock(void)
 	size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
 
 	prog_fd = bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER, prog, insns_cnt,
-				   "GPL", 0, bpf_log_buf, BPF_LOG_BUF_SIZE);
+				   "GPL", 0, bpf_log_buf, BPF_LOG_BUF_SIZE, NULL);
 	if (prog_fd < 0) {
 		printf("failed to load prog '%s'\n", strerror(errno));
 		goto cleanup;
diff --git a/samples/bpf/test_cgrp2_attach.c b/samples/bpf/test_cgrp2_attach.c
index 4bfcaf93fcf3..f8a91d2b7896 100644
--- a/samples/bpf/test_cgrp2_attach.c
+++ b/samples/bpf/test_cgrp2_attach.c
@@ -72,7 +72,7 @@  static int prog_load(int map_fd, int verdict)
 
 	return bpf_load_program(BPF_PROG_TYPE_CGROUP_SKB,
 				prog, insns_cnt, "GPL", 0,
-				bpf_log_buf, BPF_LOG_BUF_SIZE);
+				bpf_log_buf, BPF_LOG_BUF_SIZE, NULL);
 }
 
 static int usage(const char *argv0)
diff --git a/samples/bpf/test_cgrp2_attach2.c b/samples/bpf/test_cgrp2_attach2.c
index 3049b1f26267..31a0f4bd665f 100644
--- a/samples/bpf/test_cgrp2_attach2.c
+++ b/samples/bpf/test_cgrp2_attach2.c
@@ -45,7 +45,7 @@  static int prog_load(int verdict)
 
 	ret = bpf_load_program(BPF_PROG_TYPE_CGROUP_SKB,
 			       prog, insns_cnt, "GPL", 0,
-			       bpf_log_buf, BPF_LOG_BUF_SIZE);
+			       bpf_log_buf, BPF_LOG_BUF_SIZE, NULL);
 
 	if (ret < 0) {
 		log_err("Loading program");
diff --git a/samples/bpf/test_cgrp2_sock.c b/samples/bpf/test_cgrp2_sock.c
index c3cfb23e23b5..697f2db30e6a 100644
--- a/samples/bpf/test_cgrp2_sock.c
+++ b/samples/bpf/test_cgrp2_sock.c
@@ -38,7 +38,7 @@  static int prog_load(int idx)
 	size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
 
 	return bpf_load_program(BPF_PROG_TYPE_CGROUP_SOCK, prog, insns_cnt,
-				"GPL", 0, bpf_log_buf, BPF_LOG_BUF_SIZE);
+				"GPL", 0, bpf_log_buf, BPF_LOG_BUF_SIZE, NULL);
 }
 
 static int usage(const char *argv0)
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 0539a0ceef38..240c76f09d0d 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -145,6 +145,15 @@  enum bpf_attach_type {
  */
 #define BPF_F_NO_COMMON_LRU	(1U << 1)
 
+union bpf_prog_subtype {
+	struct {
+		__u32		version; /* cf. documentation */
+		__u32		event; /* enum landlock_subtype_event */
+		__aligned_u64	ability; /* LANDLOCK_SUBTYPE_ABILITY_* */
+		__aligned_u64	option; /* LANDLOCK_SUBTYPE_OPTION_* */
+	} landlock_rule;
+} __attribute__((aligned(8)));
+
 union bpf_attr {
 	struct { /* anonymous struct used by BPF_MAP_CREATE command */
 		__u32	map_type;	/* one of enum bpf_map_type */
@@ -173,6 +182,7 @@  union bpf_attr {
 		__u32		log_size;	/* size of user buffer */
 		__aligned_u64	log_buf;	/* user supplied buffer */
 		__u32		kern_version;	/* checked when prog_type=kprobe */
+		union bpf_prog_subtype prog_subtype;
 	};
 
 	struct { /* anonymous struct used by BPF_OBJ_* commands */
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index d48b70ceb25a..eb423a28e974 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -71,10 +71,12 @@  int bpf_create_map(enum bpf_map_type map_type, int key_size,
 
 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 		     size_t insns_cnt, const char *license,
-		     __u32 kern_version, char *log_buf, size_t log_buf_sz)
+		     __u32 kern_version, char *log_buf, size_t log_buf_sz,
+		     union bpf_prog_subtype *subtype)
 {
 	int fd;
 	union bpf_attr attr;
+	union bpf_prog_subtype st_none = {};
 
 	bzero(&attr, sizeof(attr));
 	attr.prog_type = type;
@@ -85,6 +87,7 @@  int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 	attr.log_size = 0;
 	attr.log_level = 0;
 	attr.kern_version = kern_version;
+	attr.prog_subtype = subtype ? *subtype : st_none;
 
 	fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
 	if (fd >= 0 || !log_buf || !log_buf_sz)
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 09c3dcac0496..c2ddecfbbbba 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -32,7 +32,7 @@  int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 		     size_t insns_cnt, const char *license,
 		     __u32 kern_version, char *log_buf,
-		     size_t log_buf_sz);
+		     size_t log_buf_sz, union bpf_prog_subtype *subtype);
 
 int bpf_map_update_elem(int fd, const void *key, const void *value,
 			__u64 flags);
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 84e6b35da4bd..c9a680faead2 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -975,7 +975,7 @@  load_program(enum bpf_prog_type type, struct bpf_insn *insns,
 		pr_warning("Alloc log buffer for bpf loader error, continue without log\n");
 
 	ret = bpf_load_program(type, insns, insns_cnt, license,
-			       kern_version, log_buf, BPF_LOG_BUF_SIZE);
+			       kern_version, log_buf, BPF_LOG_BUF_SIZE, NULL);
 
 	if (ret >= 0) {
 		*pfd = ret;
@@ -1002,7 +1002,7 @@  load_program(enum bpf_prog_type type, struct bpf_insn *insns,
 
 			fd = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
 					      insns_cnt, license, kern_version,
-					      NULL, 0);
+					      NULL, 0, NULL);
 			if (fd >= 0) {
 				close(fd);
 				ret = -LIBBPF_ERRNO__PROGTYPE;
diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
index 92343f43e44a..1b67c7c39127 100644
--- a/tools/perf/tests/bpf.c
+++ b/tools/perf/tests/bpf.c
@@ -266,7 +266,7 @@  static int check_env(void)
 
 	err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
 			       sizeof(insns) / sizeof(insns[0]),
-			       license, kver_int, NULL, 0);
+			       license, kver_int, NULL, 0, NULL);
 	if (err < 0) {
 		pr_err("Missing basic BPF support, skip this test: %s\n",
 		       strerror(errno));
diff --git a/tools/testing/selftests/bpf/test_tag.c b/tools/testing/selftests/bpf/test_tag.c
index de409fc50c35..cf7892c87b5a 100644
--- a/tools/testing/selftests/bpf/test_tag.c
+++ b/tools/testing/selftests/bpf/test_tag.c
@@ -57,7 +57,7 @@  static int bpf_try_load_prog(int insns, int fd_map,
 
 	bpf_filler(insns, fd_map);
 	fd_prog = bpf_load_program(BPF_PROG_TYPE_SCHED_CLS, prog, insns, "", 0,
-				   NULL, 0);
+				   NULL, 0, NULL);
 	assert(fd_prog > 0);
 	if (fd_map > 0)
 		bpf_filler(insns, 0);
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index e1f5b9eea1e8..15eeb79104fe 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -51,6 +51,7 @@  struct bpf_test {
 		REJECT
 	} result, result_unpriv;
 	enum bpf_prog_type prog_type;
+	union bpf_prog_subtype prog_subtype;
 };
 
 /* Note we want this to be 64 bit aligned so that the end of our array is
@@ -4539,7 +4540,7 @@  static void do_test_single(struct bpf_test *test, bool unpriv,
 
 	fd_prog = bpf_load_program(prog_type ? : BPF_PROG_TYPE_SOCKET_FILTER,
 				   prog, prog_len, "GPL", 0, bpf_vlog,
-				   sizeof(bpf_vlog));
+				   sizeof(bpf_vlog), &test->prog_subtype);
 
 	expected_ret = unpriv && test->result_unpriv != UNDEF ?
 		       test->result_unpriv : test->result;