package/kernel/linux/latest-fast-path-exec.patch

   1 diff --git a/fs/exec.c b/fs/exec.c
   2 index 9a5ca7b82bfc..fe786aeb2f1b 100644
   3 --- a/fs/exec.c
   4 +++ b/fs/exec.c
   5 @@ -1881,6 +1881,16 @@ static int do_execveat_common(int fd, struct filename *filename,
   6         if (IS_ERR(filename))
   7                 return PTR_ERR(filename);
   8
   9 +       /* Fast-path ENOENT for $PATH search failures, before we alloc an mm or
  10 +        * parse arguments. */
  11 +       if (fd == AT_FDCWD && flags == 0 && filename->name[0] == '/') {
  12 +               struct path path;
  13 +               retval = filename_lookup(AT_FDCWD, filename, 0, &path, NULL);
  14 +               if (retval == -ENOENT)
  15 +                       goto out_ret;
  16 +               path_put(&path);
  17 +       }
  18 +
  19         /*
  20          * We move the actual failure in case of RLIMIT_NPROC excess from
  21          * set*uid() to execve() because too many poorly written programs