Re: [RFC PATCH bpf-next seccomp 12/12] seccomp-ebpf: support task storage from BPF-LSM, defaulting to group leader
From: Alexei Starovoitov <hidden>
Date: 2021-05-11 01:58:22
Also in:
bpf
On Mon, May 10, 2021 at 12:22:49PM -0500, YiFei Zhu wrote:
quoted hunk ↗ jump to hunk
+ +BPF_CALL_4(bpf_task_storage_get_default_leader, struct bpf_map *, map, + struct task_struct *, task, void *, value, u64, flags) +{ + if (!task) + task = current->group_leader;
Did you actually need it to be group_leader or current is enough? If so loading BTF is not necessary. You could have exposed it bpf_get_current_task_btf() and passed its return value into bpf_task_storage_get. On the other side loading BTF can be relaxed to unpriv, but doing current->group_leader deref will make it priv only anyway.