When populating maps in bpf_object__init_global_data_maps(), recognized
sections with no data (e.g. a .bss with size 0) lead to an mmap of 0
bytes which fails with EINVAL.
Add a check to skip mapping sections which are present, but empty.
Signed-off-by: David Faust <david.faust@xxxxxxxxxx>
---
tools/lib/bpf/libbpf.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index b01fe01b0761..4e7ceb4f5a27 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1642,6 +1642,10 @@ static int bpf_object__init_global_data_maps(struct bpf_object *obj)
for (sec_idx = 1; sec_idx < obj->efile.sec_cnt; sec_idx++) {
sec_desc = &obj->efile.secs[sec_idx];
+ /* Skip recognized sections with size 0. */
+ if (sec_desc->data && sec_desc->data->d_size == 0)
+ continue;
+
switch (sec_desc->sec_type) {
case SEC_DATA:
sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, sec_idx));
--
2.36.1
