From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E607DC433F5 for ; Fri, 1 Apr 2022 14:28:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347097AbiDAO3w (ORCPT ); Fri, 1 Apr 2022 10:29:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347094AbiDAO27 (ORCPT ); Fri, 1 Apr 2022 10:28:59 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4303282B1D; Fri, 1 Apr 2022 07:27:00 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 364BF61C43; Fri, 1 Apr 2022 14:27:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 23563C34112; Fri, 1 Apr 2022 14:26:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648823219; bh=F3FQSc1hP6nwyBj6FyFPyZKn+Qy0aHxvWMd3vhQLYRM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BusjT5Ek0Y2Sj9ZVREQJVIwVh4BrWDZAAnvYzAlsZW7Jjr1jUaruJHawEEhtjVo5d pX2iKoS/U6nXU429GzKEchZlMAWmv+iNZFateAK+CT3Dw0/J/3ZpgRPsV6aXvVixvI 5UJF9LINRbN0a0I3KPIt5/tam72Dfwb/3/Zbd1Zj67aqkvLyWbs7hpdrQsFP90T/UX NOlQvZMuNafGWkK3O/Zwgqa6UcPP/zuMd+s7FEcf66fvGcFb0PKESvEc0siP0/SFMC oNc60OGaFXi0QQeus7xYtUvmjcYzTJRrySfHxTsIDiGbcadQofPxG5rBRtq+JcIxGa Nqnl+Sb3LIdlA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Philip Yang , Ruili Ji , Felix Kuehling , Alex Deucher , Sasha Levin , christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@linux.ie, daniel@ffwll.ch, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.17 022/149] drm/amdkfd: Ensure mm remain valid in svm deferred_list work Date: Fri, 1 Apr 2022 10:23:29 -0400 Message-Id: <20220401142536.1948161-22-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220401142536.1948161-1-sashal@kernel.org> References: <20220401142536.1948161-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Philip Yang [ Upstream commit 367c9b0f1b8750a704070e7ae85234d591290434 ] svm_deferred_list work should continue to handle deferred_range_list which maybe split to child range to avoid child range leak, and remove ranges mmu interval notifier to avoid mm mm_count leak. So taking mm reference when adding range to deferred list, to ensure mm is valid in the scheduled deferred_list_work, and drop the mm referrence after range is handled. Signed-off-by: Philip Yang Reported-by: Ruili Ji Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 62 ++++++++++++++++------------ 1 file changed, 36 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index f2805ba74c80..225affcddbc1 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -1985,10 +1985,9 @@ svm_range_update_notifier_and_interval_tree(struct mm_struct *mm, } static void -svm_range_handle_list_op(struct svm_range_list *svms, struct svm_range *prange) +svm_range_handle_list_op(struct svm_range_list *svms, struct svm_range *prange, + struct mm_struct *mm) { - struct mm_struct *mm = prange->work_item.mm; - switch (prange->work_item.op) { case SVM_OP_NULL: pr_debug("NULL OP 0x%p prange 0x%p [0x%lx 0x%lx]\n", @@ -2071,34 +2070,41 @@ static void svm_range_deferred_list_work(struct work_struct *work) pr_debug("enter svms 0x%p\n", svms); p = container_of(svms, struct kfd_process, svms); - /* Avoid mm is gone when inserting mmu notifier */ - mm = get_task_mm(p->lead_thread); - if (!mm) { - pr_debug("svms 0x%p process mm gone\n", svms); - return; - } -retry: - mmap_write_lock(mm); - - /* Checking for the need to drain retry faults must be inside - * mmap write lock to serialize with munmap notifiers. - */ - if (unlikely(atomic_read(&svms->drain_pagefaults))) { - mmap_write_unlock(mm); - svm_range_drain_retry_fault(svms); - goto retry; - } spin_lock(&svms->deferred_list_lock); while (!list_empty(&svms->deferred_range_list)) { prange = list_first_entry(&svms->deferred_range_list, struct svm_range, deferred_list); - list_del_init(&prange->deferred_list); spin_unlock(&svms->deferred_list_lock); pr_debug("prange 0x%p [0x%lx 0x%lx] op %d\n", prange, prange->start, prange->last, prange->work_item.op); + mm = prange->work_item.mm; +retry: + mmap_write_lock(mm); + + /* Checking for the need to drain retry faults must be inside + * mmap write lock to serialize with munmap notifiers. + */ + if (unlikely(atomic_read(&svms->drain_pagefaults))) { + mmap_write_unlock(mm); + svm_range_drain_retry_fault(svms); + goto retry; + } + + /* Remove from deferred_list must be inside mmap write lock, for + * two race cases: + * 1. unmap_from_cpu may change work_item.op and add the range + * to deferred_list again, cause use after free bug. + * 2. svm_range_list_lock_and_flush_work may hold mmap write + * lock and continue because deferred_list is empty, but + * deferred_list work is actually waiting for mmap lock. + */ + spin_lock(&svms->deferred_list_lock); + list_del_init(&prange->deferred_list); + spin_unlock(&svms->deferred_list_lock); + mutex_lock(&svms->lock); mutex_lock(&prange->migrate_mutex); while (!list_empty(&prange->child_list)) { @@ -2109,19 +2115,20 @@ static void svm_range_deferred_list_work(struct work_struct *work) pr_debug("child prange 0x%p op %d\n", pchild, pchild->work_item.op); list_del_init(&pchild->child_list); - svm_range_handle_list_op(svms, pchild); + svm_range_handle_list_op(svms, pchild, mm); } mutex_unlock(&prange->migrate_mutex); - svm_range_handle_list_op(svms, prange); + svm_range_handle_list_op(svms, prange, mm); mutex_unlock(&svms->lock); + mmap_write_unlock(mm); + + /* Pairs with mmget in svm_range_add_list_work */ + mmput(mm); spin_lock(&svms->deferred_list_lock); } spin_unlock(&svms->deferred_list_lock); - - mmap_write_unlock(mm); - mmput(mm); pr_debug("exit svms 0x%p\n", svms); } @@ -2139,6 +2146,9 @@ svm_range_add_list_work(struct svm_range_list *svms, struct svm_range *prange, prange->work_item.op = op; } else { prange->work_item.op = op; + + /* Pairs with mmput in deferred_list_work */ + mmget(mm); prange->work_item.mm = mm; list_add_tail(&prange->deferred_list, &prange->svms->deferred_range_list); -- 2.34.1