3 files changed, 20 insertions, 26 deletions

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 24e0a5a94824..a232bb59d93f 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -198,13 +198,12 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
                 return 0;
         rcu_read_lock();
         tcred = __task_cred(task);
-        if (cred->user_ns == tcred->user_ns &&
-            (cred->uid == tcred->euid &&
-             cred->uid == tcred->suid &&
-             cred->uid == tcred->uid  &&
-             cred->gid == tcred->egid &&
-             cred->gid == tcred->sgid &&
-             cred->gid == tcred->gid))
+        if (uid_eq(cred->uid, tcred->euid) &&
+            uid_eq(cred->uid, tcred->suid) &&
+            uid_eq(cred->uid, tcred->uid)  &&
+            gid_eq(cred->gid, tcred->egid) &&
+            gid_eq(cred->gid, tcred->sgid) &&
+            gid_eq(cred->gid, tcred->gid))
                 goto ok;
         if (ptrace_has_cap(tcred->user_ns, mode))
                 goto ok;
diff --git a/kernel/signal.c b/kernel/signal.c
index d6303277a640..aef629c65c87 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -767,11 +767,10 @@ static int kill_ok_by_cred(struct task_struct *t)
         const struct cred *cred = current_cred();
         const struct cred *tcred = __task_cred(t);
 
-        if (cred->user_ns == tcred->user_ns &&
-            (cred->euid == tcred->suid ||
-             cred->euid == tcred->uid ||
-             cred->uid  == tcred->suid ||
-             cred->uid  == tcred->uid))
+        if (uid_eq(cred->euid, tcred->suid) ||
+            uid_eq(cred->euid, tcred->uid)  ||
+            uid_eq(cred->uid,  tcred->suid) ||
+            uid_eq(cred->uid,  tcred->uid))
                 return 1;
 
         if (ns_capable(tcred->user_ns, CAP_KILL))
@@ -1389,10 +1388,8 @@ static int kill_as_cred_perm(const struct cred *cred,
                              struct task_struct *target)
 {
         const struct cred *pcred = __task_cred(target);
-        if (cred->user_ns != pcred->user_ns)
-                return 0;
-        if (cred->euid != pcred->suid && cred->euid != pcred->uid &&
-            cred->uid  != pcred->suid && cred->uid  != pcred->uid)
+        if (!uid_eq(cred->euid, pcred->suid) && !uid_eq(cred->euid, pcred->uid) &&
+            !uid_eq(cred->uid,  pcred->suid) && !uid_eq(cred->uid,  pcred->uid))
                 return 0;
         return 1;
 }
diff --git a/kernel/sys.c b/kernel/sys.c
index aff09f208eb3..f484077b6b14 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -131,9 +131,8 @@ static bool set_one_prio_perm(struct task_struct *p)
 {
         const struct cred *cred = current_cred(), *pcred = __task_cred(p);
 
-        if (pcred->user_ns == cred->user_ns &&
-            (pcred->uid  == cred->euid ||
-             pcred->euid == cred->euid))
+        if (uid_eq(pcred->uid,  cred->euid) ||
+            uid_eq(pcred->euid, cred->euid))
                 return true;
         if (ns_capable(pcred->user_ns, CAP_SYS_NICE))
                 return true;
@@ -1582,13 +1581,12 @@ static int check_prlimit_permission(struct task_struct *task)
                 return 0;
 
         tcred = __task_cred(task);
-        if (cred->user_ns == tcred->user_ns &&
-            (cred->uid == tcred->euid &&
-             cred->uid == tcred->suid &&
-             cred->uid == tcred->uid &&
-             cred->gid == tcred->egid &&
-             cred->gid == tcred->sgid &&
-                    cred->gid == tcred->gid))
+        if (uid_eq(cred->uid, tcred->euid) &&
+            uid_eq(cred->uid, tcred->suid) &&
+            uid_eq(cred->uid, tcred->uid)  &&
+            gid_eq(cred->gid, tcred->egid) &&
+            gid_eq(cred->gid, tcred->sgid) &&
+            gid_eq(cred->gid, tcred->gid))
                 return 0;
         if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE))
                 return 0;