From: Alexei Starovoitov Date: Tue, 8 Oct 2019 03:16:34 +0000 (-0700) Subject: Merge branch 'enforce-global-flow-dissector' X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=72ccd9200f218a7eb2933a93e69a79a1ac984d83;p=linux.git Merge branch 'enforce-global-flow-dissector' Stanislav Fomichev says: ==================== While having a per-net-ns flow dissector programs is convenient for testing, security-wise it's better to have only one vetted global flow dissector implementation. Let's have a convention that when BPF flow dissector is installed in the root namespace, child namespaces can't override it. The intended use-case is to attach global BPF flow dissector early from the init scripts/systemd. Attaching global dissector is prohibited if some non-root namespace already has flow dissector attached. Also, attaching to non-root namespace is prohibited when there is flow dissector attached to the root namespace. v3: * drop extra check and empty line (Andrii Nakryiko) v2: * EPERM -> EEXIST (Song Liu) * Make sure we don't have dissector attached to non-root namespaces when attaching the global one (Andrii Nakryiko) ==================== Signed-off-by: Alexei Starovoitov --- 72ccd9200f218a7eb2933a93e69a79a1ac984d83