1 files changed, 4 insertions, 2 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 825a3f24ad76..2ee9573ed11f 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -642,7 +642,7 @@ static inline bool si_fromuser(const struct siginfo *info)
 static int check_kill_permission(int sig, struct siginfo *info,
                                  struct task_struct *t)
 {
-        const struct cred *cred = current_cred(), *tcred;
+        const struct cred *cred, *tcred;
         struct pid *sid;
         int error;
 
@@ -656,8 +656,10 @@ static int check_kill_permission(int sig, struct siginfo *info,
         if (error)
                 return error;
 
+        cred = current_cred();
         tcred = __task_cred(t);
-        if ((cred->euid ^ tcred->suid) &&
+        if (!same_thread_group(current, t) &&
+            (cred->euid ^ tcred->suid) &&
             (cred->euid ^ tcred->uid) &&
             (cred->uid  ^ tcred->suid) &&
             (cred->uid  ^ tcred->uid) &&