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(+) -- 2.38.1
