1 files changed, 14 insertions, 13 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index b7953934aa99..cd83cc376767 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3513,7 +3513,6 @@ SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
         return kill_something_info(sig, &info, pid);
 }
 
-#ifdef CONFIG_PROC_FS
 /*
  * Verify that the signaler and signalee either are in the same pid namespace
  * or that the signaler's pid namespace is an ancestor of the signalee's pid
@@ -3550,6 +3549,14 @@ static int copy_siginfo_from_user_any(kernel_siginfo_t *kinfo, siginfo_t *info)
         return copy_siginfo_from_user(kinfo, info);
 }
 
+static struct pid *pidfd_to_pid(const struct file *file)
+{
+        if (file->f_op == &pidfd_fops)
+                return file->private_data;
+
+        return tgid_pidfd_to_pid(file);
+}
+
 /**
  * sys_pidfd_send_signal - send a signal to a process through a task file
  *                          descriptor
@@ -3581,12 +3588,12 @@ SYSCALL_DEFINE4(pidfd_send_signal, int, pidfd, int, sig,
         if (flags)
                 return -EINVAL;
 
-        f = fdget_raw(pidfd);
+        f = fdget(pidfd);
         if (!f.file)
                 return -EBADF;
 
         /* Is this a pidfd? */
-        pid = tgid_pidfd_to_pid(f.file);
+        pid = pidfd_to_pid(f.file);
         if (IS_ERR(pid)) {
                 ret = PTR_ERR(pid);
                 goto err;
@@ -3605,16 +3612,11 @@ SYSCALL_DEFINE4(pidfd_send_signal, int, pidfd, int, sig,
                 if (unlikely(sig != kinfo.si_signo))
                         goto err;
 
+                /* Only allow sending arbitrary signals to yourself. */
+                ret = -EPERM;
                 if ((task_pid(current) != pid) &&
-                    (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL)) {
-                        /* Only allow sending arbitrary signals to yourself. */
-                        ret = -EPERM;
-                        if (kinfo.si_code != SI_USER)
-                                goto err;
-
-                        /* Turn this into a regular kill signal. */
-                        prepare_kill_siginfo(sig, &kinfo);
-                }
+                    (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
+                        goto err;
         } else {
                 prepare_kill_siginfo(sig, &kinfo);
         }
@@ -3625,7 +3627,6 @@ err:
         fdput(f);
         return ret;
 }
-#endif /* CONFIG_PROC_FS */
 
 static int
 do_send_specific(pid_t tgid, pid_t pid, int sig, struct kernel_siginfo *info)