Currently bpf_get_current_pid_tgid() is allowed in tracing, cgroup
and sk_msg progs while bpf_get_ns_current_pid_tgid() is only allowed
in tracing progs.
We have an internal use case where for an application running
in a container (with pid namespace), user wants to get
the pid associated with the pid namespace in a cgroup bpf
program. Besides cgroup, the only prog type, supporting
bpf_get_current_pid_tgid() but not bpf_get_ns_current_pid_tgid(),
is sk_msg and this patch set added it as well.
Patch 1 added the kernel support and patches 2-5 added
the test for cgroup and sk_msg.
Yonghong Song (5):
bpf: Allow helper bpf_get_ns_current_pid_tgid() in cgroup and sk_msg
programs
selftests/bpf: Replace CHECK with ASSERT_* in ns_current_pid_tgid test
selftests/bpf: Refactor out some functions in ns_current_pid_tgid test
selftests/bpf: Add a cgroup prog bpf_get_ns_current_pid_tgid() test
selftests/bpf: Add a sk_msg prog bpf_get_ns_current_pid_tgid() test
kernel/bpf/cgroup.c | 2 +
net/core/filter.c | 2 +
.../bpf/prog_tests/ns_current_pid_tgid.c | 195 +++++++++++++++---
.../bpf/progs/test_ns_current_pid_tgid.c | 31 ++-
4 files changed, 196 insertions(+), 34 deletions(-)
--
2.43.0
