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userns: signal remove unnecessary map_cred_ns 

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.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-03-13 16:04:35 -07:00
parent 65cc5a17ad
commit 54ba47edac
1 changed files with 5 additions and 15 deletions
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20
kernel/signal.c
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@ -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();
}