[PATCH bpf-next 0/2] Add kfunc for doing pid -> task lookup

David Vernet
2022-11-22T14:54:40Z

A series of prior patches added support for storing struct task_struct *
objects as kptrs. This patch set proposes extending this with another
kfunc called bpf_task_from_pid() which performs a lookup of a task from
its pid, from the root pid namespace idr.

This allows BPF programs that don't have a kptr to a task, to instead
perform a lookup by pid. This will be useful for programs that are
tracking pids and want, e.g., to do a lookup to find task->comm.

David Vernet (2):
bpf: Add bpf_task_from_pid() kfunc
selftests/bpf: Add selftests for bpf_task_from_pid()

kernel/bpf/helpers.c | 20 +++++
.../selftests/bpf/prog_tests/task_kfunc.c | 3 +
.../selftests/bpf/progs/task_kfunc_common.h | 1 +
.../selftests/bpf/progs/task_kfunc_success.c | 73 +++++++++++++++++++
4 files changed, 97 insertions(+)

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2.38.1