linux-kernel - [PATCH 4.15 16/84] libbpf: prefer global symbols as bpf program name source

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Message-Id: <20180323095414.374570704@linuxfoundation.org>
Date:   Fri, 23 Mar 2018 10:53:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Roman Gushchin <guro@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Martin KaFai Lau <kafai@...com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        David Ahern <dsahern@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.15 16/84] libbpf: prefer global symbols as bpf program name source

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roman Gushchin <guro@...com>


[ Upstream commit fe4d44b23f6b38194a92c6b8a50d921a071c4db4 ]

Libbpf picks the name of the first symbol in the corresponding
elf section to use as a program name. But without taking symbol's
scope into account it may end's up with some local label
as a program name. E.g.:

$ bpftool prog
1: type 15  name LBB0_10    tag 0390a5136ba23f5c
	loaded_at Dec 07/17:22  uid 0
	xlated 456B  not jited  memlock 4096B

Fix this by preferring global symbols as program name.

For instance:
$ bpftool prog
1: type 15  name bpf_prog1  tag 0390a5136ba23f5c
	loaded_at Dec 07/17:26  uid 0
	xlated 456B  not jited  memlock 4096B

Signed-off-by: Roman Gushchin <guro@...com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: Martin KaFai Lau <kafai@...com>
Cc: Quentin Monnet <quentin.monnet@...ronome.com>
Cc: David Ahern <dsahern@...il.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/lib/bpf/libbpf.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -387,6 +387,8 @@ bpf_object__init_prog_names(struct bpf_o
 				continue;
 			if (sym.st_shndx != prog->idx)
 				continue;
+			if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL)
+				continue;
 
 			name = elf_strptr(obj->efile.elf,
 					  obj->efile.strtabidx,