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    Subject[PATCH v5 2/4] bpf-lsm: Make bpf_lsm_userns_create() sleepable
    Date
    Users may want to audit calls to security_create_user_ns() and access
    user space memory. Also create_user_ns() runs without
    pagefault_disabled(). Therefore, make bpf_lsm_userns_create() sleepable
    for mandatory access control policies.

    Acked-by: Alexei Starovoitov <ast@kernel.org>
    Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
    Acked-by: KP Singh <kpsingh@kernel.org>
    Signed-off-by: Frederick Lawler <fred@cloudflare.com>

    ---
    Changes since v4:
    - None
    Changes since v3:
    - None
    Changes since v2:
    - Rename create_user_ns hook to userns_create
    Changes since v1:
    - None
    ---
    kernel/bpf/bpf_lsm.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
    index fa71d58b7ded..761998fda762 100644
    --- a/kernel/bpf/bpf_lsm.c
    +++ b/kernel/bpf/bpf_lsm.c
    @@ -335,6 +335,7 @@ BTF_ID(func, bpf_lsm_task_getsecid_obj)
    BTF_ID(func, bpf_lsm_task_prctl)
    BTF_ID(func, bpf_lsm_task_setscheduler)
    BTF_ID(func, bpf_lsm_task_to_inode)
    +BTF_ID(func, bpf_lsm_userns_create)
    BTF_SET_END(sleepable_lsm_hooks)

    bool bpf_lsm_is_sleepable_hook(u32 btf_id)
    --
    2.30.2
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