diff options
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/cgroup.c | 30 | ||||
| -rw-r--r-- | kernel/bpf/syscall.c | 11 |
2 files changed, 32 insertions, 9 deletions
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c index bf634959885c..da6e48e802b2 100644 --- a/kernel/bpf/cgroup.c +++ b/kernel/bpf/cgroup.c @@ -557,8 +557,9 @@ found: * * Must be called with cgroup_mutex held. */ -int __cgroup_bpf_replace(struct cgroup *cgrp, struct bpf_cgroup_link *link, - struct bpf_prog *new_prog) +static int __cgroup_bpf_replace(struct cgroup *cgrp, + struct bpf_cgroup_link *link, + struct bpf_prog *new_prog) { struct list_head *progs = &cgrp->bpf.progs[link->type]; struct bpf_prog *old_prog; @@ -583,6 +584,30 @@ int __cgroup_bpf_replace(struct cgroup *cgrp, struct bpf_cgroup_link *link, return 0; } +static int cgroup_bpf_replace(struct bpf_link *link, struct bpf_prog *new_prog, + struct bpf_prog *old_prog) +{ + struct bpf_cgroup_link *cg_link; + int ret; + + cg_link = container_of(link, struct bpf_cgroup_link, link); + + mutex_lock(&cgroup_mutex); + /* link might have been auto-released by dying cgroup, so fail */ + if (!cg_link->cgroup) { + ret = -EINVAL; + goto out_unlock; + } + if (old_prog && link->prog != old_prog) { + ret = -EPERM; + goto out_unlock; + } + ret = __cgroup_bpf_replace(cg_link->cgroup, cg_link, new_prog); +out_unlock: + mutex_unlock(&cgroup_mutex); + return ret; +} + static struct bpf_prog_list *find_detach_entry(struct list_head *progs, struct bpf_prog *prog, struct bpf_cgroup_link *link, @@ -811,6 +836,7 @@ static void bpf_cgroup_link_dealloc(struct bpf_link *link) const struct bpf_link_ops bpf_cgroup_link_lops = { .release = bpf_cgroup_link_release, .dealloc = bpf_cgroup_link_dealloc, + .update_prog = cgroup_bpf_replace, }; int cgroup_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 7626b8024471..f5358e1462eb 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -3645,13 +3645,10 @@ static int link_update(union bpf_attr *attr) goto out_put_progs; } -#ifdef CONFIG_CGROUP_BPF - if (link->ops == &bpf_cgroup_link_lops) { - ret = cgroup_bpf_replace(link, old_prog, new_prog); - goto out_put_progs; - } -#endif - ret = -EINVAL; + if (link->ops->update_prog) + ret = link->ops->update_prog(link, new_prog, old_prog); + else + ret = EINVAL; out_put_progs: if (old_prog) |