netdev - [PATCH net-next 2/2] samples/bpf: fix bpf loader

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Message-ID: <1479862329-2361912-2-git-send-email-ast@fb.com>
Date:   Tue, 22 Nov 2016 16:52:09 -0800
From:   Alexei Starovoitov <ast@...com>
To:     "David S . Miller" <davem@...emloft.net>
CC:     Daniel Borkmann <daniel@...earbox.net>, <netdev@...r.kernel.org>
Subject: [PATCH net-next 2/2] samples/bpf: fix bpf loader

llvm can emit relocations into sections other than program code
(like debug info sections). Ignore them during parsing of elf file

Signed-off-by: Alexei Starovoitov <ast@...nel.org>
---
 samples/bpf/bpf_load.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index 97913e109b14..62f54d6eb8bf 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -317,6 +317,10 @@ int load_bpf_file(char *path)
 				    &shdr_prog, &data_prog))
 				continue;

+			if (shdr_prog.sh_type != SHT_PROGBITS ||
+			    !(shdr_prog.sh_flags & SHF_EXECINSTR))
+				continue;
+
 			insns = (struct bpf_insn *) data_prog->d_buf;

 			processed_sec[shdr.sh_info] = true;
-- 
2.8.0