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    Subject[PATCH 21/43] userns: Convert sched_set_affinity and sched_set_scheduler's permission checks
    From: Eric W. Biederman <ebiederm@xmission.com>

    - Compare kuids with uid_eq
    - kuid are uniuqe across all user namespaces so there is no longer the
    need for a user_namespace comparison.

    Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
    ---
    kernel/sched/core.c | 7 ++-----
    1 files changed, 2 insertions(+), 5 deletions(-)

    diff --git a/kernel/sched/core.c b/kernel/sched/core.c
    index 96bff85..b189fec 100644
    --- a/kernel/sched/core.c
    +++ b/kernel/sched/core.c
    @@ -4042,11 +4042,8 @@ static bool check_same_owner(struct task_struct *p)

    rcu_read_lock();
    pcred = __task_cred(p);
    - if (cred->user_ns == pcred->user_ns)
    - match = (cred->euid == pcred->euid ||
    - cred->euid == pcred->uid);
    - else
    - match = false;
    + match = (uid_eq(cred->euid, pcred->euid) ||
    + uid_eq(cred->euid, pcred->uid));
    rcu_read_unlock();
    return match;
    }
    --
    1.7.2.5


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