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bpf, cgroup: Return ENOLINK for auto-detached links on update

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Failure to update a bpf_link because it has been auto-detached by a dying
cgroup currently results in EINVAL error, even though the arguments passed
to bpf() syscall are not wrong.

bpf_links attaching to netns in this case will return ENOLINK, which
carries the message that the link is no longer attached to anything.

Change cgroup bpf_links to do the same to keep the uAPI errors consistent.

Fixes: 0c991ebc8c ("bpf: Implement bpf_prog replacement for an active bpf_cgroup_link")
Suggested-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200531082846.2117903-6-jakub@cloudflare.com
This commit is contained in:
Jakub Sitnicki 2020-05-31 10:28:39 +02:00 committed by Alexei Starovoitov
parent 7f045a49fe
commit 0c047ecbb7
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/cgroup.c
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@ -595,7 +595,7 @@ static int cgroup_bpf_replace(struct bpf_link *link, struct bpf_prog *new_prog,
mutex_lock(&cgroup_mutex);
/* link might have been auto-released by dying cgroup, so fail */
if (!cg_link->cgroup) {
ret = -EINVAL;
ret = -ENOLINK;
goto out_unlock;
}
if (old_prog && link->prog != old_prog) {