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Test for the NULL argv argument producing a single empty string on exec. Cc: Eric Biederman <ebiederm@xmission.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Yang Yingliang <yangyingliang@huawei.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-kselftest@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/lkml/20220201011637.2457646-1-keescook@chromium.org