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| author | Jakub Sitnicki <jakub@cloudflare.com> | 2020-05-31 10:28:39 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-06-01 15:21:03 -0700 |
| commit | 0c047ecbb7bab4c1d2136f5f04bb47a66a9a12b8 (patch) | |
| tree | 0efdb4ab26c8013322151d42e1eaf31968ce0ed4 | |
| parent | 7f045a49fee04b5662cbdeaf0838f9322ae8c63a (diff) | |
| download | linux-0c047ecbb7bab4c1d2136f5f04bb47a66a9a12b8.tar.gz | |
bpf, cgroup: Return ENOLINK for auto-detached links on update
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: 0c991ebc8c69 ("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
| -rw-r--r-- | kernel/bpf/cgroup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c index 5c0e964105ac..fdf7836750a3 100644 --- a/kernel/bpf/cgroup.c +++ b/kernel/bpf/cgroup.c @@ -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) { |