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Date:   Mon, 31 Aug 2020 18:49:59 -0700
From:   Andrii Nakryiko <andriin@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>,
        Andrii Nakryiko <andriin@...com>
Subject: [PATCH v2 bpf-next 10/14] libbpf: deprecate notion of BPF program "title" in favor of "section name"

BPF program title is ambigious and misleading term. It is ELF section name, so
let's just call it that and deprecate bpf_program__title() API in favor of
bpf_program__section_name().

Additionally, using bpf_object__find_program_by_title() is now inherently
dangerous and ambiguous, as multiple BPF program can have the same section
name. So deprecate this API as well and recommend to switch to non-ambiguous
bpf_object__find_program_by_name().

Internally, clean up usage and mis-usage of BPF program section name for
denoting BPF program name. Shorten the field name to prog->sec_name to be
consistent with all other prog->sec_* variables.

Signed-off-by: Andrii Nakryiko <andriin@...com>
---
 tools/lib/bpf/libbpf.c   | 215 ++++++++++++++++++---------------------
 tools/lib/bpf/libbpf.h   |   5 +-
 tools/lib/bpf/libbpf.map |   1 +
 3 files changed, 101 insertions(+), 120 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 1485e562ec32..f65502d2963d 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -217,7 +217,7 @@ struct bpf_sec_def {
  */
 struct bpf_program {
 	const struct bpf_sec_def *sec_def;
-	char *section_name;
+	char *sec_name;
 	size_t sec_idx;
 	/* this program's instruction offset (in number of instructions)
 	 * within its containing ELF section
@@ -239,7 +239,7 @@ struct bpf_program {
 	size_t sub_insn_off;
 
 	char *name;
-	/* section_name with / replaced by _; makes recursive pinning
+	/* sec_name with / replaced by _; makes recursive pinning
 	 * in bpf_object__pin_programs easier
 	 */
 	char *pin_name;
@@ -515,7 +515,7 @@ static void bpf_program__exit(struct bpf_program *prog)
 
 	bpf_program__unload(prog);
 	zfree(&prog->name);
-	zfree(&prog->section_name);
+	zfree(&prog->sec_name);
 	zfree(&prog->pin_name);
 	zfree(&prog->insns);
 	zfree(&prog->reloc_desc);
@@ -529,7 +529,7 @@ static char *__bpf_program__pin_name(struct bpf_program *prog)
 {
 	char *name, *p;
 
-	name = p = strdup(prog->section_name);
+	name = p = strdup(prog->sec_name);
 	while ((p = strchr(p, '/')))
 		*p = '_';
 
@@ -574,8 +574,8 @@ bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog,
 	prog->instances.fds = NULL;
 	prog->instances.nr = -1;
 
-	prog->section_name = strdup(sec_name);
-	if (!prog->section_name)
+	prog->sec_name = strdup(sec_name);
+	if (!prog->sec_name)
 		goto errout;
 
 	prog->name = strdup(name);
@@ -3254,7 +3254,7 @@ bpf_object__find_program_by_title(const struct bpf_object *obj,
 	struct bpf_program *pos;
 
 	bpf_object__for_each_program(pos, obj) {
-		if (pos->section_name && !strcmp(pos->section_name, title))
+		if (pos->sec_name && !strcmp(pos->sec_name, title))
 			return pos;
 	}
 	return NULL;
@@ -4994,8 +4994,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog,
 			*val = sz;
 		} else {
 			pr_warn("prog '%s': relo %d at insn #%d can't be applied to array access\n",
-				bpf_program__title(prog, false),
-				relo->kind, relo->insn_off / 8);
+				prog->name, relo->kind, relo->insn_off / 8);
 			return -EINVAL;
 		}
 		if (validate)
@@ -5017,8 +5016,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog,
 			if (byte_sz >= 8) {
 				/* bitfield can't be read with 64-bit read */
 				pr_warn("prog '%s': relo %d at insn #%d can't be satisfied for bitfield\n",
-					bpf_program__title(prog, false),
-					relo->kind, relo->insn_off / 8);
+					prog->name, relo->kind, relo->insn_off / 8);
 				return -E2BIG;
 			}
 			byte_sz *= 2;
@@ -5183,8 +5181,8 @@ static int bpf_core_calc_relo(const struct bpf_program *prog,
 	} else if (err == -EOPNOTSUPP) {
 		/* EOPNOTSUPP means unknown/unsupported relocation */
 		pr_warn("prog '%s': relo #%d: unrecognized CO-RE relocation %s (%d) at insn #%d\n",
-			bpf_program__title(prog, false), relo_idx,
-			core_relo_kind_str(relo->kind), relo->kind, relo->insn_off / 8);
+			prog->name, relo_idx, core_relo_kind_str(relo->kind),
+			relo->kind, relo->insn_off / 8);
 	}
 
 	return err;
@@ -5198,7 +5196,7 @@ static void bpf_core_poison_insn(struct bpf_program *prog, int relo_idx,
 				 int insn_idx, struct bpf_insn *insn)
 {
 	pr_debug("prog '%s': relo #%d: substituting insn #%d w/ invalid insn\n",
-		 bpf_program__title(prog, false), relo_idx, insn_idx);
+		 prog->name, relo_idx, insn_idx);
 	insn->code = BPF_JMP | BPF_CALL;
 	insn->dst_reg = 0;
 	insn->src_reg = 0;
@@ -5270,14 +5268,14 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
 			return -EINVAL;
 		if (res->validate && insn->imm != orig_val) {
 			pr_warn("prog '%s': relo #%d: unexpected insn #%d (ALU/ALU64) value: got %u, exp %u -> %u\n",
-				bpf_program__title(prog, false), relo_idx,
+				prog->name, relo_idx,
 				insn_idx, insn->imm, orig_val, new_val);
 			return -EINVAL;
 		}
 		orig_val = insn->imm;
 		insn->imm = new_val;
 		pr_debug("prog '%s': relo #%d: patched insn #%d (ALU/ALU64) imm %u -> %u\n",
-			 bpf_program__title(prog, false), relo_idx, insn_idx,
+			 prog->name, relo_idx, insn_idx,
 			 orig_val, new_val);
 		break;
 	case BPF_LDX:
@@ -5285,21 +5283,18 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
 	case BPF_STX:
 		if (res->validate && insn->off != orig_val) {
 			pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDX/ST/STX) value: got %u, exp %u -> %u\n",
-				bpf_program__title(prog, false), relo_idx,
-				insn_idx, insn->off, orig_val, new_val);
+				prog->name, relo_idx, insn_idx, insn->off, orig_val, new_val);
 			return -EINVAL;
 		}
 		if (new_val > SHRT_MAX) {
 			pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) value too big: %u\n",
-				bpf_program__title(prog, false), relo_idx,
-				insn_idx, new_val);
+				prog->name, relo_idx, insn_idx, new_val);
 			return -ERANGE;
 		}
 		orig_val = insn->off;
 		insn->off = new_val;
 		pr_debug("prog '%s': relo #%d: patched insn #%d (LDX/ST/STX) off %u -> %u\n",
-			 bpf_program__title(prog, false), relo_idx, insn_idx,
-			 orig_val, new_val);
+			 prog->name, relo_idx, insn_idx, orig_val, new_val);
 		break;
 	case BPF_LD: {
 		__u64 imm;
@@ -5310,14 +5305,14 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
 		    insn[1].code != 0 || insn[1].dst_reg != 0 ||
 		    insn[1].src_reg != 0 || insn[1].off != 0) {
 			pr_warn("prog '%s': relo #%d: insn #%d (LDIMM64) has unexpected form\n",
-				bpf_program__title(prog, false), relo_idx, insn_idx);
+				prog->name, relo_idx, insn_idx);
 			return -EINVAL;
 		}
 
 		imm = insn[0].imm + ((__u64)insn[1].imm << 32);
 		if (res->validate && imm != orig_val) {
 			pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDIMM64) value: got %llu, exp %u -> %u\n",
-				bpf_program__title(prog, false), relo_idx,
+				prog->name, relo_idx,
 				insn_idx, (unsigned long long)imm,
 				orig_val, new_val);
 			return -EINVAL;
@@ -5326,15 +5321,14 @@ static int bpf_core_patch_insn(struct bpf_program *prog,
 		insn[0].imm = new_val;
 		insn[1].imm = 0; /* currently only 32-bit values are supported */
 		pr_debug("prog '%s': relo #%d: patched insn #%d (LDIMM64) imm64 %llu -> %u\n",
-			 bpf_program__title(prog, false), relo_idx, insn_idx,
+			 prog->name, relo_idx, insn_idx,
 			 (unsigned long long)imm, new_val);
 		break;
 	}
 	default:
 		pr_warn("prog '%s': relo #%d: trying to relocate unrecognized insn #%d, code:0x%x, src:0x%x, dst:0x%x, off:0x%x, imm:0x%x\n",
-			bpf_program__title(prog, false), relo_idx,
-			insn_idx, insn->code, insn->src_reg, insn->dst_reg,
-			insn->off, insn->imm);
+			prog->name, relo_idx, insn_idx, insn->code,
+			insn->src_reg, insn->dst_reg, insn->off, insn->imm);
 		return -EINVAL;
 	}
 
@@ -5464,7 +5458,6 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 			       const struct btf *targ_btf,
 			       struct hashmap *cand_cache)
 {
-	const char *prog_name = bpf_program__title(prog, false);
 	struct bpf_core_spec local_spec, cand_spec, targ_spec = {};
 	const void *type_key = u32_as_hash_key(relo->type_id);
 	struct bpf_core_relo_res cand_res, targ_res;
@@ -5491,13 +5484,13 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 	err = bpf_core_parse_spec(local_btf, local_id, spec_str, relo->kind, &local_spec);
 	if (err) {
 		pr_warn("prog '%s': relo #%d: parsing [%d] %s %s + %s failed: %d\n",
-			prog_name, relo_idx, local_id, btf_kind_str(local_type),
+			prog->name, relo_idx, local_id, btf_kind_str(local_type),
 			str_is_empty(local_name) ? "<anon>" : local_name,
 			spec_str, err);
 		return -EINVAL;
 	}
 
-	pr_debug("prog '%s': relo #%d: kind <%s> (%d), spec is ", prog_name,
+	pr_debug("prog '%s': relo #%d: kind <%s> (%d), spec is ", prog->name,
 		 relo_idx, core_relo_kind_str(relo->kind), relo->kind);
 	bpf_core_dump_spec(LIBBPF_DEBUG, &local_spec);
 	libbpf_print(LIBBPF_DEBUG, "\n");
@@ -5514,7 +5507,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 	/* libbpf doesn't support candidate search for anonymous types */
 	if (str_is_empty(spec_str)) {
 		pr_warn("prog '%s': relo #%d: <%s> (%d) relocation doesn't support anonymous types\n",
-			prog_name, relo_idx, core_relo_kind_str(relo->kind), relo->kind);
+			prog->name, relo_idx, core_relo_kind_str(relo->kind), relo->kind);
 		return -EOPNOTSUPP;
 	}
 
@@ -5522,7 +5515,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 		cand_ids = bpf_core_find_cands(local_btf, local_id, targ_btf);
 		if (IS_ERR(cand_ids)) {
 			pr_warn("prog '%s': relo #%d: target candidate search failed for [%d] %s %s: %ld",
-				prog_name, relo_idx, local_id, btf_kind_str(local_type),
+				prog->name, relo_idx, local_id, btf_kind_str(local_type),
 				local_name, PTR_ERR(cand_ids));
 			return PTR_ERR(cand_ids);
 		}
@@ -5538,13 +5531,13 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 		err = bpf_core_spec_match(&local_spec, targ_btf, cand_id, &cand_spec);
 		if (err < 0) {
 			pr_warn("prog '%s': relo #%d: error matching candidate #%d ",
-				prog_name, relo_idx, i);
+				prog->name, relo_idx, i);
 			bpf_core_dump_spec(LIBBPF_WARN, &cand_spec);
 			libbpf_print(LIBBPF_WARN, ": %d\n", err);
 			return err;
 		}
 
-		pr_debug("prog '%s': relo #%d: %s candidate #%d ", prog_name,
+		pr_debug("prog '%s': relo #%d: %s candidate #%d ", prog->name,
 			 relo_idx, err == 0 ? "non-matching" : "matching", i);
 		bpf_core_dump_spec(LIBBPF_DEBUG, &cand_spec);
 		libbpf_print(LIBBPF_DEBUG, "\n");
@@ -5564,7 +5557,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 			 * should all resolve to the same bit offset
 			 */
 			pr_warn("prog '%s': relo #%d: field offset ambiguity: %u != %u\n",
-				prog_name, relo_idx, cand_spec.bit_offset,
+				prog->name, relo_idx, cand_spec.bit_offset,
 				targ_spec.bit_offset);
 			return -EINVAL;
 		} else if (cand_res.poison != targ_res.poison || cand_res.new_val != targ_res.new_val) {
@@ -5573,7 +5566,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 			 * proceed due to ambiguity
 			 */
 			pr_warn("prog '%s': relo #%d: relocation decision ambiguity: %s %u != %s %u\n",
-				prog_name, relo_idx,
+				prog->name, relo_idx,
 				cand_res.poison ? "failure" : "success", cand_res.new_val,
 				targ_res.poison ? "failure" : "success", targ_res.new_val);
 			return -EINVAL;
@@ -5606,7 +5599,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 	 */
 	if (j == 0) {
 		pr_debug("prog '%s': relo #%d: no matching targets found\n",
-			 prog_name, relo_idx);
+			 prog->name, relo_idx);
 
 		/* calculate single target relo result explicitly */
 		err = bpf_core_calc_relo(prog, relo, relo_idx, &local_spec, NULL, &targ_res);
@@ -5619,7 +5612,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
 	err = bpf_core_patch_insn(prog, relo, relo_idx, &targ_res);
 	if (err) {
 		pr_warn("prog '%s': relo #%d: failed to patch insn at offset %d: %d\n",
-			prog_name, relo_idx, relo->insn_off, err);
+			prog->name, relo_idx, relo->insn_off, err);
 		return -EINVAL;
 	}
 
@@ -5673,7 +5666,7 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path)
 		prog = NULL;
 		for (i = 0; i < obj->nr_programs; i++) {
 			prog = &obj->programs[i];
-			if (strcmp(prog->section_name, sec_name) == 0)
+			if (strcmp(prog->sec_name, sec_name) == 0)
 				break;
 		}
 		if (!prog) {
@@ -5787,7 +5780,7 @@ static int adjust_prog_btf_ext_info(const struct bpf_object *obj,
 		sec_name = btf__name_by_offset(obj->btf, sec->sec_name_off);
 		if (!sec_name)
 			return -EINVAL;
-		if (strcmp(sec_name, prog->section_name) != 0)
+		if (strcmp(sec_name, prog->sec_name) != 0)
 			continue;
 
 		for_each_btf_ext_rec(ext_info, sec, i, rec) {
@@ -6438,8 +6431,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
 	int err = 0, fd, i, btf_id;
 
 	if (prog->obj->loaded) {
-		pr_warn("prog '%s'('%s'): can't load after object was loaded\n",
-			prog->name, prog->section_name);
+		pr_warn("prog '%s': can't load after object was loaded\n", prog->name);
 		return -EINVAL;
 	}
 
@@ -6455,7 +6447,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
 	if (prog->instances.nr < 0 || !prog->instances.fds) {
 		if (prog->preprocessor) {
 			pr_warn("Internal error: can't load program '%s'\n",
-				prog->section_name);
+				prog->name);
 			return -LIBBPF_ERRNO__INTERNAL;
 		}
 
@@ -6470,8 +6462,8 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
 
 	if (!prog->preprocessor) {
 		if (prog->instances.nr != 1) {
-			pr_warn("Program '%s' is inconsistent: nr(%d) != 1\n",
-				prog->section_name, prog->instances.nr);
+			pr_warn("prog '%s': inconsistent nr(%d) != 1\n",
+				prog->name, prog->instances.nr);
 		}
 		err = load_program(prog, prog->insns, prog->insns_cnt,
 				   license, kern_ver, &fd);
@@ -6489,13 +6481,13 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
 				   prog->insns_cnt, &result);
 		if (err) {
 			pr_warn("Preprocessing the %dth instance of program '%s' failed\n",
-				i, prog->section_name);
+				i, prog->name);
 			goto out;
 		}
 
 		if (!result.new_insn_ptr || !result.new_insn_cnt) {
 			pr_debug("Skip loading the %dth instance of program '%s'\n",
-				 i, prog->section_name);
+				 i, prog->name);
 			prog->instances.fds[i] = -1;
 			if (result.pfd)
 				*result.pfd = -1;
@@ -6506,7 +6498,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
 				   result.new_insn_cnt, license, kern_ver, &fd);
 		if (err) {
 			pr_warn("Loading the %dth instance of program '%s' failed\n",
-				i, prog->section_name);
+				i, prog->name);
 			goto out;
 		}
 
@@ -6516,7 +6508,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver)
 	}
 out:
 	if (err)
-		pr_warn("failed to load program '%s'\n", prog->section_name);
+		pr_warn("failed to load program '%s'\n", prog->name);
 	zfree(&prog->insns);
 	prog->insns_cnt = 0;
 	return err;
@@ -6608,7 +6600,7 @@ __bpf_object__open(const char *path, const void *obj_buf, size_t obj_buf_sz,
 	bpf_object__elf_finish(obj);
 
 	bpf_object__for_each_program(prog, obj) {
-		prog->sec_def = find_sec_def(prog->section_name);
+		prog->sec_def = find_sec_def(prog->sec_name);
 		if (!prog->sec_def)
 			/* couldn't guess, but user might manually specify */
 			continue;
@@ -6989,7 +6981,7 @@ int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
 
 	if (instance < 0 || instance >= prog->instances.nr) {
 		pr_warn("invalid prog instance %d of prog %s (max %d)\n",
-			instance, prog->section_name, prog->instances.nr);
+			instance, prog->name, prog->instances.nr);
 		return -EINVAL;
 	}
 
@@ -7020,7 +7012,7 @@ int bpf_program__unpin_instance(struct bpf_program *prog, const char *path,
 
 	if (instance < 0 || instance >= prog->instances.nr) {
 		pr_warn("invalid prog instance %d of prog %s (max %d)\n",
-			instance, prog->section_name, prog->instances.nr);
+			instance, prog->name, prog->instances.nr);
 		return -EINVAL;
 	}
 
@@ -7050,8 +7042,7 @@ int bpf_program__pin(struct bpf_program *prog, const char *path)
 	}
 
 	if (prog->instances.nr <= 0) {
-		pr_warn("no instances of prog %s to pin\n",
-			   prog->section_name);
+		pr_warn("no instances of prog %s to pin\n", prog->name);
 		return -EINVAL;
 	}
 
@@ -7113,8 +7104,7 @@ int bpf_program__unpin(struct bpf_program *prog, const char *path)
 	}
 
 	if (prog->instances.nr <= 0) {
-		pr_warn("no instances of prog %s to pin\n",
-			   prog->section_name);
+		pr_warn("no instances of prog %s to pin\n", prog->name);
 		return -EINVAL;
 	}
 
@@ -7649,11 +7639,16 @@ const char *bpf_program__name(const struct bpf_program *prog)
 	return prog->name;
 }
 
+const char *bpf_program__section_name(const struct bpf_program *prog)
+{
+	return prog->sec_name;
+}
+
 const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy)
 {
 	const char *title;
 
-	title = prog->section_name;
+	title = prog->sec_name;
 	if (needs_copy) {
 		title = strdup(title);
 		if (!title) {
@@ -7726,14 +7721,14 @@ int bpf_program__nth_fd(const struct bpf_program *prog, int n)
 
 	if (n >= prog->instances.nr || n < 0) {
 		pr_warn("Can't get the %dth fd from program %s: only %d instances\n",
-			n, prog->section_name, prog->instances.nr);
+			n, prog->name, prog->instances.nr);
 		return -EINVAL;
 	}
 
 	fd = prog->instances.fds[n];
 	if (fd < 0) {
 		pr_warn("%dth instance of program '%s' is invalid\n",
-			n, prog->section_name);
+			n, prog->name);
 		return -ENOENT;
 	}
 
@@ -8170,7 +8165,7 @@ static int bpf_object__collect_st_ops_relos(struct bpf_object *obj,
 		if (prog->type == BPF_PROG_TYPE_UNSPEC) {
 			const struct bpf_sec_def *sec_def;
 
-			sec_def = find_sec_def(prog->section_name);
+			sec_def = find_sec_def(prog->sec_name);
 			if (sec_def &&
 			    sec_def->prog_type != BPF_PROG_TYPE_STRUCT_OPS) {
 				/* for pr_warn */
@@ -8193,7 +8188,7 @@ static int bpf_object__collect_st_ops_relos(struct bpf_object *obj,
 
 invalid_prog:
 	pr_warn("struct_ops reloc %s: cannot use prog %s in sec %s with type %u attach_btf_id %u expected_attach_type %u for func ptr %s\n",
-		map->name, prog->name, prog->section_name, prog->type,
+		map->name, prog->name, prog->sec_name, prog->type,
 		prog->attach_btf_id, prog->expected_attach_type, name);
 	return -EINVAL;
 }
@@ -8297,7 +8292,7 @@ static int libbpf_find_attach_btf_id(struct bpf_program *prog)
 {
 	enum bpf_attach_type attach_type = prog->expected_attach_type;
 	__u32 attach_prog_fd = prog->attach_prog_fd;
-	const char *name = prog->section_name;
+	const char *name = prog->sec_name;
 	int i, err;
 
 	if (!name)
@@ -8824,14 +8819,14 @@ struct bpf_link *bpf_program__attach_perf_event(struct bpf_program *prog,
 	int prog_fd, err;
 
 	if (pfd < 0) {
-		pr_warn("program '%s': invalid perf event FD %d\n",
-			bpf_program__title(prog, false), pfd);
+		pr_warn("prog '%s': invalid perf event FD %d\n",
+			prog->name, pfd);
 		return ERR_PTR(-EINVAL);
 	}
 	prog_fd = bpf_program__fd(prog);
 	if (prog_fd < 0) {
-		pr_warn("program '%s': can't attach BPF program w/o FD (did you load it?)\n",
-			bpf_program__title(prog, false));
+		pr_warn("prog '%s': can't attach BPF program w/o FD (did you load it?)\n",
+			prog->name);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -8844,20 +8839,18 @@ struct bpf_link *bpf_program__attach_perf_event(struct bpf_program *prog,
 	if (ioctl(pfd, PERF_EVENT_IOC_SET_BPF, prog_fd) < 0) {
 		err = -errno;
 		free(link);
-		pr_warn("program '%s': failed to attach to pfd %d: %s\n",
-			bpf_program__title(prog, false), pfd,
-			   libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
+		pr_warn("prog '%s': failed to attach to pfd %d: %s\n",
+			prog->name, pfd, libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
 		if (err == -EPROTO)
-			pr_warn("program '%s': try add PERF_SAMPLE_CALLCHAIN to or remove exclude_callchain_[kernel|user] from pfd %d\n",
-				bpf_program__title(prog, false), pfd);
+			pr_warn("prog '%s': try add PERF_SAMPLE_CALLCHAIN to or remove exclude_callchain_[kernel|user] from pfd %d\n",
+				prog->name, pfd);
 		return ERR_PTR(err);
 	}
 	if (ioctl(pfd, PERF_EVENT_IOC_ENABLE, 0) < 0) {
 		err = -errno;
 		free(link);
-		pr_warn("program '%s': failed to enable pfd %d: %s\n",
-			bpf_program__title(prog, false), pfd,
-			   libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
+		pr_warn("prog '%s': failed to enable pfd %d: %s\n",
+			prog->name, pfd, libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
 		return ERR_PTR(err);
 	}
 	return link;
@@ -8979,9 +8972,8 @@ struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog,
 	pfd = perf_event_open_probe(false /* uprobe */, retprobe, func_name,
 				    0 /* offset */, -1 /* pid */);
 	if (pfd < 0) {
-		pr_warn("program '%s': failed to create %s '%s' perf event: %s\n",
-			bpf_program__title(prog, false),
-			retprobe ? "kretprobe" : "kprobe", func_name,
+		pr_warn("prog '%s': failed to create %s '%s' perf event: %s\n",
+			prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
 			libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
 		return ERR_PTR(pfd);
 	}
@@ -8989,9 +8981,8 @@ struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog,
 	if (IS_ERR(link)) {
 		close(pfd);
 		err = PTR_ERR(link);
-		pr_warn("program '%s': failed to attach to %s '%s': %s\n",
-			bpf_program__title(prog, false),
-			retprobe ? "kretprobe" : "kprobe", func_name,
+		pr_warn("prog '%s': failed to attach to %s '%s': %s\n",
+			prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
 			libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
 		return link;
 	}
@@ -9004,7 +8995,7 @@ static struct bpf_link *attach_kprobe(const struct bpf_sec_def *sec,
 	const char *func_name;
 	bool retprobe;
 
-	func_name = bpf_program__title(prog, false) + sec->len;
+	func_name = prog->sec_name + sec->len;
 	retprobe = strcmp(sec->sec, "kretprobe/") == 0;
 
 	return bpf_program__attach_kprobe(prog, retprobe, func_name);
@@ -9022,9 +9013,8 @@ struct bpf_link *bpf_program__attach_uprobe(struct bpf_program *prog,
 	pfd = perf_event_open_probe(true /* uprobe */, retprobe,
 				    binary_path, func_offset, pid);
 	if (pfd < 0) {
-		pr_warn("program '%s': failed to create %s '%s:0x%zx' perf event: %s\n",
-			bpf_program__title(prog, false),
-			retprobe ? "uretprobe" : "uprobe",
+		pr_warn("prog '%s': failed to create %s '%s:0x%zx' perf event: %s\n",
+			prog->name, retprobe ? "uretprobe" : "uprobe",
 			binary_path, func_offset,
 			libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
 		return ERR_PTR(pfd);
@@ -9033,9 +9023,8 @@ struct bpf_link *bpf_program__attach_uprobe(struct bpf_program *prog,
 	if (IS_ERR(link)) {
 		close(pfd);
 		err = PTR_ERR(link);
-		pr_warn("program '%s': failed to attach to %s '%s:0x%zx': %s\n",
-			bpf_program__title(prog, false),
-			retprobe ? "uretprobe" : "uprobe",
+		pr_warn("prog '%s': failed to attach to %s '%s:0x%zx': %s\n",
+			prog->name, retprobe ? "uretprobe" : "uprobe",
 			binary_path, func_offset,
 			libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
 		return link;
@@ -9103,9 +9092,8 @@ struct bpf_link *bpf_program__attach_tracepoint(struct bpf_program *prog,
 
 	pfd = perf_event_open_tracepoint(tp_category, tp_name);
 	if (pfd < 0) {
-		pr_warn("program '%s': failed to create tracepoint '%s/%s' perf event: %s\n",
-			bpf_program__title(prog, false),
-			tp_category, tp_name,
+		pr_warn("prog '%s': failed to create tracepoint '%s/%s' perf event: %s\n",
+			prog->name, tp_category, tp_name,
 			libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
 		return ERR_PTR(pfd);
 	}
@@ -9113,9 +9101,8 @@ struct bpf_link *bpf_program__attach_tracepoint(struct bpf_program *prog,
 	if (IS_ERR(link)) {
 		close(pfd);
 		err = PTR_ERR(link);
-		pr_warn("program '%s': failed to attach to tracepoint '%s/%s': %s\n",
-			bpf_program__title(prog, false),
-			tp_category, tp_name,
+		pr_warn("prog '%s': failed to attach to tracepoint '%s/%s': %s\n",
+			prog->name, tp_category, tp_name,
 			libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
 		return link;
 	}
@@ -9128,7 +9115,7 @@ static struct bpf_link *attach_tp(const struct bpf_sec_def *sec,
 	char *sec_name, *tp_cat, *tp_name;
 	struct bpf_link *link;
 
-	sec_name = strdup(bpf_program__title(prog, false));
+	sec_name = strdup(prog->sec_name);
 	if (!sec_name)
 		return ERR_PTR(-ENOMEM);
 
@@ -9157,8 +9144,7 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
 
 	prog_fd = bpf_program__fd(prog);
 	if (prog_fd < 0) {
-		pr_warn("program '%s': can't attach before loaded\n",
-			bpf_program__title(prog, false));
+		pr_warn("prog '%s': can't attach before loaded\n", prog->name);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -9171,9 +9157,8 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
 	if (pfd < 0) {
 		pfd = -errno;
 		free(link);
-		pr_warn("program '%s': failed to attach to raw tracepoint '%s': %s\n",
-			bpf_program__title(prog, false), tp_name,
-			libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
+		pr_warn("prog '%s': failed to attach to raw tracepoint '%s': %s\n",
+			prog->name, tp_name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
 		return ERR_PTR(pfd);
 	}
 	link->fd = pfd;
@@ -9183,7 +9168,7 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
 static struct bpf_link *attach_raw_tp(const struct bpf_sec_def *sec,
 				      struct bpf_program *prog)
 {
-	const char *tp_name = bpf_program__title(prog, false) + sec->len;
+	const char *tp_name = prog->sec_name + sec->len;
 
 	return bpf_program__attach_raw_tracepoint(prog, tp_name);
 }
@@ -9197,8 +9182,7 @@ static struct bpf_link *bpf_program__attach_btf_id(struct bpf_program *prog)
 
 	prog_fd = bpf_program__fd(prog);
 	if (prog_fd < 0) {
-		pr_warn("program '%s': can't attach before loaded\n",
-			bpf_program__title(prog, false));
+		pr_warn("prog '%s': can't attach before loaded\n", prog->name);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -9211,9 +9195,8 @@ static struct bpf_link *bpf_program__attach_btf_id(struct bpf_program *prog)
 	if (pfd < 0) {
 		pfd = -errno;
 		free(link);
-		pr_warn("program '%s': failed to attach: %s\n",
-			bpf_program__title(prog, false),
-			libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
+		pr_warn("prog '%s': failed to attach: %s\n",
+			prog->name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
 		return ERR_PTR(pfd);
 	}
 	link->fd = pfd;
@@ -9259,8 +9242,7 @@ bpf_program__attach_fd(struct bpf_program *prog, int target_fd,
 
 	prog_fd = bpf_program__fd(prog);
 	if (prog_fd < 0) {
-		pr_warn("program '%s': can't attach before loaded\n",
-			bpf_program__title(prog, false));
+		pr_warn("prog '%s': can't attach before loaded\n", prog->name);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -9274,8 +9256,8 @@ bpf_program__attach_fd(struct bpf_program *prog, int target_fd,
 	if (link_fd < 0) {
 		link_fd = -errno;
 		free(link);
-		pr_warn("program '%s': failed to attach to %s: %s\n",
-			bpf_program__title(prog, false), target_name,
+		pr_warn("prog '%s': failed to attach to %s: %s\n",
+			prog->name, target_name,
 			libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
 		return ERR_PTR(link_fd);
 	}
@@ -9319,8 +9301,7 @@ bpf_program__attach_iter(struct bpf_program *prog,
 
 	prog_fd = bpf_program__fd(prog);
 	if (prog_fd < 0) {
-		pr_warn("program '%s': can't attach before loaded\n",
-			bpf_program__title(prog, false));
+		pr_warn("prog '%s': can't attach before loaded\n", prog->name);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -9334,9 +9315,8 @@ bpf_program__attach_iter(struct bpf_program *prog,
 	if (link_fd < 0) {
 		link_fd = -errno;
 		free(link);
-		pr_warn("program '%s': failed to attach to iterator: %s\n",
-			bpf_program__title(prog, false),
-			libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
+		pr_warn("prog '%s': failed to attach to iterator: %s\n",
+			prog->name, libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
 		return ERR_PTR(link_fd);
 	}
 	link->fd = link_fd;
@@ -9347,7 +9327,7 @@ struct bpf_link *bpf_program__attach(struct bpf_program *prog)
 {
 	const struct bpf_sec_def *sec_def;
 
-	sec_def = find_sec_def(bpf_program__title(prog, false));
+	sec_def = find_sec_def(prog->sec_name);
 	if (!sec_def || !sec_def->attach_fn)
 		return ERR_PTR(-ESRCH);
 
@@ -10417,12 +10397,11 @@ int bpf_object__attach_skeleton(struct bpf_object_skeleton *s)
 		struct bpf_program *prog = *s->progs[i].prog;
 		struct bpf_link **link = s->progs[i].link;
 		const struct bpf_sec_def *sec_def;
-		const char *sec_name = bpf_program__title(prog, false);
 
 		if (!prog->load)
 			continue;
 
-		sec_def = find_sec_def(sec_name);
+		sec_def = find_sec_def(prog->sec_name);
 		if (!sec_def || !sec_def->attach_fn)
 			continue;
 
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 308e0ded8f14..a750f67a23f6 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -198,8 +198,9 @@ LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
 					 __u32 ifindex);
 
 LIBBPF_API const char *bpf_program__name(const struct bpf_program *prog);
-LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog,
-					  bool needs_copy);
+LIBBPF_API const char *bpf_program__section_name(const struct bpf_program *prog);
+LIBBPF_API LIBBPF_DEPRECATED("BPF program title is confusing term; please use bpf_program__section_name() instead")
+const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy);
 LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog);
 LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload);
 
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 3fedcdc4ae2f..92ceb48a5ca2 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -302,6 +302,7 @@ LIBBPF_0.1.0 {
 
 LIBBPF_0.2.0 {
 	global:
+		bpf_program__section_name;
 		perf_buffer__buffer_cnt;
 		perf_buffer__buffer_fd;
 		perf_buffer__epoll_fd;
-- 
2.24.1

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