From dc8afad968a0500c9b027a4f63341d8e979fbe00 Mon Sep 17 00:00:00 2001 From: Suren Baghdasaryan Date: Wed, 17 Jul 2019 13:21:00 -0400 Subject: [PATCH] UPSTREAM: pidfd: fix a poll race when setting exit_state There is a race between reading task->exit_state in pidfd_poll and writing it after do_notify_parent calls do_notify_pidfd. Expected sequence of events is: CPU 0 CPU 1 ------------------------------------------------ exit_notify do_notify_parent do_notify_pidfd tsk->exit_state = EXIT_DEAD pidfd_poll if (tsk->exit_state) However nothing prevents the following sequence: CPU 0 CPU 1 ------------------------------------------------ exit_notify do_notify_parent do_notify_pidfd pidfd_poll if (tsk->exit_state) tsk->exit_state = EXIT_DEAD This causes a polling task to wait forever, since poll blocks because exit_state is 0 and the waiting task is not notified again. A stress test continuously doing pidfd poll and process exits uncovered this bug. To fix it, we make sure that the task's exit_state is always set before calling do_notify_pidfd. Fixes: b53b0b9d9a6 ("pidfd: add polling support") Cc: kernel-team@android.com Cc: Oleg Nesterov Signed-off-by: Suren Baghdasaryan Signed-off-by: Joel Fernandes (Google) Link: https://lore.kernel.org/r/20190717172100.261204-1-joel@joelfernandes.org [christian@brauner.io: adapt commit message and drop unneeded changes from wait_task_zombie] Signed-off-by: Christian Brauner (cherry picked from commit b191d6491be67cef2b3fa83015561caca1394ab9) Mot-CRs-fixed: (CR) Bug: 135608568 Test: test program using syscall(__NR_sys_pidfd_open,..) and poll() Change-Id: I043e54c9b69f25de88f6f19ae167920af8532de2 Signed-off-by: Suren Baghdasaryan Reviewed-on: https://gerrit.mot.com/1505858 SLTApproved: Slta Waiver SME-Granted: SME Approvals Granted Tested-by: Jira Key Reviewed-by: Wang Wang Reviewed-by: Yonghui Jia Submit-Approved: Jira Key Reviewed-on: https://gerrit.mot.com/1796167 Reviewed-by: Xiangpo Zhao --- kernel/exit.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/exit.c b/kernel/exit.c index 644e280c68ab..8b995e8b0f81 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -719,6 +719,7 @@ static void exit_notify(struct task_struct *tsk, int group_dead) if (group_dead) kill_orphaned_pgrp(tsk->group_leader, NULL); + tsk->exit_state = EXIT_ZOMBIE; if (unlikely(tsk->ptrace)) { int sig = thread_group_leader(tsk) && thread_group_empty(tsk) && -- 2.20.1