Message ID | 20231025094224.72858-14-michael.weiss@aisec.fraunhofer.de |
---|---|
State | New |
Headers |
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device_cgroup: guard mknod for non-initial user namespace
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Commit Message
Michael Weiß
Oct. 25, 2023, 9:42 a.m. UTC
This helper can be used to check if a cgroup-bpf specific program is active for the current task. Signed-off-by: Michael Weiß <michael.weiss@aisec.fraunhofer.de> Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com> --- include/linux/bpf-cgroup.h | 2 ++ kernel/bpf/cgroup.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+)
diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h index 8506690dbb9c..655697c2a620 100644 --- a/include/linux/bpf-cgroup.h +++ b/include/linux/bpf-cgroup.h @@ -184,6 +184,8 @@ static inline bool cgroup_bpf_sock_enabled(struct sock *sk, return array != &bpf_empty_prog_array.hdr; } +bool cgroup_bpf_current_enabled(enum cgroup_bpf_attach_type type); + /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */ #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \ ({ \ diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c index 03b3d4492980..19ae3d037db7 100644 --- a/kernel/bpf/cgroup.c +++ b/kernel/bpf/cgroup.c @@ -24,6 +24,20 @@ DEFINE_STATIC_KEY_ARRAY_FALSE(cgroup_bpf_enabled_key, MAX_CGROUP_BPF_ATTACH_TYPE); EXPORT_SYMBOL(cgroup_bpf_enabled_key); +bool cgroup_bpf_current_enabled(enum cgroup_bpf_attach_type type) +{ + struct cgroup *cgrp; + struct bpf_prog_array *array; + + rcu_read_lock(); + cgrp = task_dfl_cgroup(current); + rcu_read_unlock(); + + array = rcu_access_pointer(cgrp->bpf.effective[type]); + return array != &bpf_empty_prog_array.hdr; +} +EXPORT_SYMBOL(cgroup_bpf_current_enabled); + /* __always_inline is necessary to prevent indirect call through run_prog * function pointer. */