libbpf: set BTF FD for prog only when there is supported .BTF.ext data

5d01ab7bac46 ("libbpf: fix erroneous multi-closing of BTF FD")
introduced backwards-compatibility issue, manifesting itself as -E2BIG
error returned on program load due to unknown non-zero btf_fd attribute
value for BPF_PROG_LOAD sys_bpf() sub-command.

This patch fixes bug by ensuring that we only ever associate BTF FD with
program if there is a BTF.ext data that was successfully loaded into
kernel, which automatically means kernel supports func_info/line_info
and associated BTF FD for progs (checked and ensured also by BTF
sanitization code).

Fixes: 5d01ab7bac46 ("libbpf: fix erroneous multi-closing of BTF FD")
Reported-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 2e84fa5b8479..2b57d7ea7836 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2472,7 +2472,11 @@ load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt,
         load_attr.license = license;
         load_attr.kern_version = kern_version;
         load_attr.prog_ifindex = prog->prog_ifindex;
-        btf_fd = bpf_object__btf_fd(prog->obj);
+        /* if .BTF.ext was loaded, kernel supports associated BTF for prog */
+        if (prog->obj->btf_ext)
+                btf_fd = bpf_object__btf_fd(prog->obj);
+        else
+                btf_fd = -1;
         load_attr.prog_btf_fd = btf_fd >= 0 ? btf_fd : 0;
         load_attr.func_info = prog->func_info;
         load_attr.func_info_rec_size = prog->func_info_rec_size;