From patchwork Wed Sep 2 10:21:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Brauner X-Patchwork-Id: 11750259 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 72E561575 for ; Wed, 2 Sep 2020 10:23:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6585A208DB for ; Wed, 2 Sep 2020 10:23:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726377AbgIBKXY (ORCPT ); Wed, 2 Sep 2020 06:23:24 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:49494 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726210AbgIBKXV (ORCPT ); Wed, 2 Sep 2020 06:23:21 -0400 Received: from ip5f5af70b.dynamic.kabel-deutschland.de ([95.90.247.11] helo=wittgenstein.fritz.box) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1kDPvC-00069F-UV; Wed, 02 Sep 2020 10:23:19 +0000 From: Christian Brauner To: linux-kernel@vger.kernel.org Cc: Christian Brauner , "Peter Zijlstra (Intel)" , Ingo Molnar , Thomas Gleixner , Oleg Nesterov , "Eric W. Biederman" , Kees Cook , Sargun Dhillon , Aleksa Sarai , linux-kselftest@vger.kernel.org, Josh Triplett , Jens Axboe , linux-api@vger.kernel.org, Christian Brauner , Jann Horn Subject: [PATCH v2 2/4] exit: support non-blocking pidfds Date: Wed, 2 Sep 2020 12:21:28 +0200 Message-Id: <20200902102130.147672-3-christian.brauner@ubuntu.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200902102130.147672-1-christian.brauner@ubuntu.com> References: <20200902102130.147672-1-christian.brauner@ubuntu.com> MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Passing a non-blocking pidfd to waitid() currently has no effect, i.e. is not supported. There are users which would like to use waitid() on pidfds that are O_NONBLOCK and mix it with pidfds that are blocking and both pass them to waitid(). The expected behavior is to have waitid() return -EAGAIN for non-blocking pidfds and to block for blocking pidfds without needing to perform any additional checks for flags set on the pidfd before passing it to waitid(). Non-blocking pidfds will return EAGAIN from waitid() when no child process is ready yet. Returning -EAGAIN for non-blocking pidfds makes it easier for event loops that handle EAGAIN specially. It also makes the API more consistent and uniform. In essence, waitid() is treated like a read on a non-blocking pidfd or a recvmsg() on a non-blocking socket. With the addition of support for non-blocking pidfds we support the same functionality that sockets do. For sockets() recvmsg() supports MSG_DONTWAIT for pidfds waitid() supports WNOHANG. Both flags are per-call options. In contrast non-blocking pidfds and non-blocking sockets are a setting on an open file description affecting all threads in the calling process as well as other processes that hold file descriptors referring to the same open file description. Both behaviors, per call and per open file description, have genuine use-cases. The implementation should be straightforward, we simply raise the WNOHANG flag when a non-blocking pidfd is passed and when do_wait() returns without finding an eligible task and the pidfd is non-blocking we set EAGAIN. If no child process exists non-blocking pidfd users will continue to see ECHILD but if child processes exist but have not yet exited users will see EAGAIN. A concrete use-case that was brought on-list was Josh's async pidfd library. Ever since the introduction of pidfds and more advanced async io various programming languages such as Rust have grown support for async event libraries. These libraries are created to help build epoll-based event loops around file descriptors. A common pattern is to automatically make all file descriptors they manage to O_NONBLOCK. For such libraries the EAGAIN error code is treated specially. When a function is called that returns EAGAIN the function isn't called again until the event loop indicates the the file descriptor is ready. Supporting EAGAIN when waiting on pidfds makes such libraries just work with little effort. Link: https://lore.kernel.org/lkml/20200811181236.GA18763@localhost/ Link: https://github.com/joshtriplett/async-pidfd Cc: Kees Cook Cc: Sargun Dhillon Cc: Jann Horn Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Oleg Nesterov Cc: "Peter Zijlstra (Intel)" Suggested-by: Josh Triplett Signed-off-by: Christian Brauner Reviewed-by: Oleg Nesterov Reviewed-by: Josh Triplett --- /* v2 */ - Oleg Nesterov : - Remove the eagain_error and simple set to EAGAIN in kernel_waitid() if pidfd is non-blocking and no child process has yet exited. --- kernel/exit.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/kernel/exit.c b/kernel/exit.c index 733e80f334e7..254ea3efe954 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -1474,7 +1474,7 @@ static long do_wait(struct wait_opts *wo) return retval; } -static struct pid *pidfd_get_pid(unsigned int fd) +static struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags) { struct fd f; struct pid *pid; @@ -1484,8 +1484,10 @@ static struct pid *pidfd_get_pid(unsigned int fd) return ERR_PTR(-EBADF); pid = pidfd_pid(f.file); - if (!IS_ERR(pid)) + if (!IS_ERR(pid)) { get_pid(pid); + *flags = f.file->f_flags; + } fdput(f); return pid; @@ -1498,6 +1500,7 @@ static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop, struct pid *pid = NULL; enum pid_type type; long ret; + unsigned int f_flags = 0; if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) @@ -1531,9 +1534,10 @@ static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop, if (upid < 0) return -EINVAL; - pid = pidfd_get_pid(upid); + pid = pidfd_get_pid(upid, &f_flags); if (IS_ERR(pid)) return PTR_ERR(pid); + break; default: return -EINVAL; @@ -1544,7 +1548,12 @@ static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop, wo.wo_flags = options; wo.wo_info = infop; wo.wo_rusage = ru; + if (f_flags & O_NONBLOCK) + wo.wo_flags |= WNOHANG; + ret = do_wait(&wo); + if (!ret && (f_flags & O_NONBLOCK)) + ret = -EAGAIN; put_pid(pid); return ret;