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    SubjectRe: [PATCH bpf-next v1 07/13] bpf: lsm: Implement attach, detach and execution.
    On Fri, Dec 20, 2019 at 7:43 AM KP Singh <kpsingh@chromium.org> wrote:
    >
    > From: KP Singh <kpsingh@google.com>
    >
    > A user space program can attach an eBPF program by:
    >
    > hook_fd = open("/sys/kernel/security/bpf/bprm_check_security",
    > O_RDWR|O_CLOEXEC)
    > prog_fd = bpf(BPF_PROG_LOAD, ...)
    > bpf(BPF_PROG_ATTACH, hook_fd, prog_fd)
    >
    > The following permissions are required to attach a program to a hook:
    >
    > - CAP_SYS_ADMIN to load eBPF programs
    > - CAP_MAC_ADMIN (to update the policy of an LSM)
    > - The securityfs file being a valid hook and writable (O_RDWR)
    >
    > When such an attach call is received, the attachment logic looks up the
    > dentry and appends the program to the bpf_prog_array.
    >
    > The BPF programs are stored in a bpf_prog_array and writes to the array
    > are guarded by a mutex. The eBPF programs are executed as a part of the
    > LSM hook they are attached to. If any of the eBPF programs return
    > an error (-ENOPERM) the action represented by the hook is denied.
    >
    > Signed-off-by: KP Singh <kpsingh@google.com>
    > ---

    Acked-by: Andrii Nakryiko <andriin@fb.com>

    > MAINTAINERS | 1 +
    > include/linux/bpf_lsm.h | 13 ++++
    > kernel/bpf/syscall.c | 5 +-
    > security/bpf/lsm_fs.c | 19 +++++-
    > security/bpf/ops.c | 134 ++++++++++++++++++++++++++++++++++++++++
    > 5 files changed, 169 insertions(+), 3 deletions(-)
    >

    [...]

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