(__pthread_kill): Disallow sending SIGCANCEL.

diff --git a/nptl/sysdeps/unix/sysv/linux/pthread_kill.c b/nptl/sysdeps/unix/sysv/linux/pthread_kill.c
index 2caa728..a35a3f0 100644 (file)
--- a/nptl/sysdeps/unix/sysv/linux/pthread_kill.c
+++ b/nptl/sysdeps/unix/sysv/linux/pthread_kill.c
@@ -36,6 +36,10 @@ __pthread_kill (threadid, signo)
     /* Not a valid thread handle.  */
     return ESRCH;
 
+  /* Disallow sending the signal we use for cancellation.  */
+  if (signo == SIGCANCEL)
+    return EINVAL;
+
   /* We have a special syscall to do the work.  */
   INTERNAL_SYSCALL_DECL (err);