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libbpf: Add bpf object kern_version attribute setter

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Unfortunately some distros don't have their kernel version defined
accurately in <linux/version.h> due to different long term support
reasons.

It is important to have a way to override the bpf kern_version
attribute during runtime: some old kernels might still check for
kern_version attribute during bpf_prog_load().

Signed-off-by: Rafael David Tinoco <rafaeldtinoco@ubuntu.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210323040952.2118241-1-rafaeldtinoco@ubuntu.com
This commit is contained in:
Rafael David Tinoco
2021-03-23 01:09:52 -03:00
committed by Andrii Nakryiko
parent 53f0e7d8ec
commit b09a4999d9
3 changed files with 12 additions and 0 deletions
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10
src/libbpf.c
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@@ -8270,6 +8270,16 @@ int bpf_object__btf_fd(const struct bpf_object *obj)
return obj->btf ? btf__fd(obj->btf) : -1;
}
int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version)
{
if (obj->loaded)
return -EINVAL;
obj->kern_version = kern_version;
return 0;
}
int bpf_object__set_priv(struct bpf_object *obj, void *priv,
bpf_object_clear_priv_t clear_priv)
{