From: Yonghong Song <yhs@xxxxxx>
[ Upstream commit ac4e0e055fee5751c78bba1fc9ce508a6874d916 ]
For a host which has a lower rlimit for max locked memory (e.g., 64KB),
the following error occurs in one of our production systems:
# /usr/sbin/bpftool prog load /paragon/pods/52877437/home/mark.o \
/sys/fs/bpf/paragon_mark_21 type cgroup/skb \
map idx 0 pinned /sys/fs/bpf/paragon_map_21
libbpf: Error in bpf_object__probe_name():Operation not permitted(1).
Couldn't load basic 'r0 = 0' BPF program.
Error: failed to open object file
The reason is due to low locked memory during bpf_object__probe_name()
which probes whether program name is supported in kernel or not
during __bpf_object__open_xattr().
bpftool program load already tries to relax mlock rlimit before
bpf_object__load(). Let us move set_max_rlimit() before
__bpf_object__open_xattr(), which fixed the issue here.
Fixes: 47eff61777c7 ("bpf, libbpf: introduce bpf_object__probe_caps to test BPF capabilities")
Signed-off-by: Yonghong Song <yhs@xxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/bpf/bpftool/prog.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index d2be5a06c339..ed8ef5c82256 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -873,6 +873,8 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
}
}
+ set_max_rlimit();
+
obj = __bpf_object__open_xattr(&attr, bpf_flags);
if (IS_ERR_OR_NULL(obj)) {
p_err("failed to open object file");
@@ -952,8 +954,6 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
goto err_close_obj;
}
- set_max_rlimit();
-
err = bpf_object__load(obj);
if (err) {
p_err("failed to load object file");
--
2.20.1
