1 files changed, 10 insertions, 0 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 2852d0e76ea3..541fd805fb88 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2338,6 +2338,8 @@ struct mm_struct *copy_init_mm(void)
  *
  * It copies the process, and if successful kick-starts
  * it and waits for it to finish using the VM if required.
+ *
+ * args->exit_signal is expected to be checked for sanity by the caller.
  */
 long _do_fork(struct kernel_clone_args *args)
 {
@@ -2562,6 +2564,14 @@ noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs,
         if (copy_from_user(&args, uargs, size))
                 return -EFAULT;
 
+        /*
+         * Verify that higher 32bits of exit_signal are unset and that
+         * it is a valid signal
+         */
+        if (unlikely((args.exit_signal & ~((u64)CSIGNAL)) ||
+                     !valid_signal(args.exit_signal)))
+                return -EINVAL;
+
         *kargs = (struct kernel_clone_args){
                 .flags          = args.flags,
                 .pidfd          = u64_to_user_ptr(args.pidfd),