• Sargun Dhillon's avatar
    samples/bpf: Add test_current_task_under_cgroup test · 9e6e60ec
    Sargun Dhillon authored
    This test has a BPF program which writes the last known pid to call the
    sync syscall within a given cgroup to a map.
    
    The user mode program creates its own mount namespace, and mounts the
    cgroupsv2  hierarchy in there, as on all current test systems
    (Ubuntu 16.04, Debian), the cgroupsv2 vfs is unmounted by default.
    Once it does this, it proceeds to test.
    
    The test checks for positive and negative condition. It ensures that
    when it's part of a given cgroup, its pid is captured in the map,
    and that when it leaves the cgroup, this doesn't happen.
    
    It populate a cgroups arraymap prior to execution in userspace. This means
    that the program must be run in the same cgroups namespace as the programs
    that are being traced.
    Signed-off-by: 's avatarSargun Dhillon <sargun@sargun.me>
    Cc: Alexei Starovoitov <ast@kernel.org>
    Cc: Daniel Borkmann <daniel@iogearbox.net>
    Cc: Tejun Heo <tj@kernel.org>
    Acked-by: 's avatarAlexei Starovoitov <ast@kernel.org>
    Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
    9e6e60ec
test_current_task_under_cgroup_user.c 3.21 KB