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libbpf: Reject static entry-point BPF programs
author
Andrii Nakryiko
<andrii@kernel.org>
Fri, 14 May 2021 19:55:34 +0000
(12:55 -0700)
committer
Alexei Starovoitov
<ast@kernel.org>
Fri, 14 May 2021 23:11:09 +0000
(16:11 -0700)
Detect use of static entry-point BPF programs (those with SEC() markings) and
emit error message. This is similar to
c1cccec9c636
("libbpf: Reject static maps") but for BPF programs.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link:
https://lore.kernel.org/bpf/20210514195534.1440970-1-andrii@kernel.org
tools/lib/bpf/libbpf.c
patch
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diff --git
a/tools/lib/bpf/libbpf.c
b/tools/lib/bpf/libbpf.c
index
182bd3d
..
e58f51b
100644
(file)
--- a/
tools/lib/bpf/libbpf.c
+++ b/
tools/lib/bpf/libbpf.c
@@
-677,6
+677,11
@@
bpf_object__add_programs(struct bpf_object *obj, Elf_Data *sec_data,
return -LIBBPF_ERRNO__FORMAT;
}
+ if (sec_idx != obj->efile.text_shndx && GELF_ST_BIND(sym.st_info) == STB_LOCAL) {
+ pr_warn("sec '%s': program '%s' is static and not supported\n", sec_name, name);
+ return -ENOTSUP;
+ }
+
pr_debug("sec '%s': found program '%s' at insn offset %zu (%zu bytes), code size %zu insns (%zu bytes)\n",
sec_name, name, sec_off / BPF_INSN_SZ, sec_off, prog_sz / BPF_INSN_SZ, prog_sz);