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unshare(CLONE_NEWPID) can return EINVAL if the kernel does not have the CONFIG_PID_NS option enabled. Add a check on these calls to skip the test if we receive EINVAL. Signed-off-by: Terry Tritton <terry.tritton@linaro.org> Link: https://lore.kernel.org/r/20240124141357.1243457-2-terry.tritton@linaro.org Signed-off-by: Kees Cook <keescook@chromium.org>