Quoting Eric W. Beiderman (ebiederm@xxxxxxxxxxxx):
> From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
>
> map_cred_ns is a light wrapper around from_kuid with the order of the arguments
> reversed. Replace map_cred_ns with from_kuid and remove map_cred_ns.
>
> Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
> ---
> kernel/signal.c | 20 +++++---------------
> 1 files changed, 5 insertions(+), 15 deletions(-)
>
> diff --git a/kernel/signal.c b/kernel/signal.c
> index 9797939..6aca310 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -1019,15 +1019,6 @@ static inline int legacy_queue(struct sigpending *signals, int sig)
> return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);
> }
>
> -/*
> - * map the uid in struct cred into user namespace *ns
> - */
> -static inline uid_t map_cred_ns(const struct cred *cred,
> - struct user_namespace *ns)
> -{
> - return from_kuid_munged(ns, cred->uid);
> -}
> -
> #ifdef CONFIG_USER_NS
> static inline void userns_fixup_signal_uid(struct siginfo *info, struct task_struct *t)
> {
> @@ -1677,8 +1668,8 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
> */
> rcu_read_lock();
> info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
> - info.si_uid = map_cred_ns(__task_cred(tsk),
> - task_cred_xxx(tsk->parent, user_ns));
> + info.si_uid = from_kuid_munged(task_cred_xxx(tsk->parent, user_ns),
> + task_uid(tsk));
> rcu_read_unlock();
>
> info.si_utime = cputime_to_clock_t(tsk->utime + tsk->signal->utime);
> @@ -1761,8 +1752,7 @@ static void do_notify_parent_cldstop(struct task_struct *tsk,
> */
> rcu_read_lock();
> info.si_pid = task_pid_nr_ns(tsk, parent->nsproxy->pid_ns);
> - info.si_uid = map_cred_ns(__task_cred(tsk),
> - task_cred_xxx(parent, user_ns));
> + info.si_uid = from_kuid_munged(task_cred_xxx(parent, user_ns), task_uid(tsk));
> rcu_read_unlock();
>
> info.si_utime = cputime_to_clock_t(tsk->utime);
> @@ -2180,8 +2170,8 @@ static int ptrace_signal(int signr, siginfo_t *info,
> info->si_code = SI_USER;
> rcu_read_lock();
> info->si_pid = task_pid_vnr(current->parent);
> - info->si_uid = map_cred_ns(__task_cred(current->parent),
> - current_user_ns());
> + info->si_uid = from_kuid_munged(current_user_ns(),
> + task_uid(current->parent));
> rcu_read_unlock();
> }
>
> --
> 1.7.2.5
>
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