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[208.91.0.190]) by mx.google.com with ESMTPS id p125si40279576pfp.35.2019.08.03.12.59.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 03 Aug 2019 12:59:04 -0700 (PDT) Received-SPF: pass (google.com: domain of akaher@vmware.com designates 208.91.0.190 as permitted sender) client-ip=208.91.0.190; Authentication-Results: mx.google.com; spf=pass (google.com: domain of akaher@vmware.com designates 208.91.0.190 as permitted sender) smtp.mailfrom=akaher@vmware.com; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=vmware.com Received: from sc9-mailhost2.vmware.com (10.113.161.72) by EX13-EDG-OU-002.vmware.com (10.113.208.156) with Microsoft SMTP Server id 15.0.1156.6; Sat, 3 Aug 2019 12:58:57 -0700 Received: from akaher-lnx-dev.eng.vmware.com (unknown [10.110.19.203]) by sc9-mailhost2.vmware.com (Postfix) with ESMTP id 3A639B26C6; Sat, 3 Aug 2019 15:58:56 -0400 (EDT) From: Ajay Kaher To: , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v6 2/3][v4.9.y] infiniband: fix race condition between infiniband mlx4, mlx5 driver and core dumping Date: Sun, 4 Aug 2019 09:29:26 +0530 Message-ID: <1564891168-30016-2-git-send-email-akaher@vmware.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1564891168-30016-1-git-send-email-akaher@vmware.com> References: <1564891168-30016-1-git-send-email-akaher@vmware.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: None (EX13-EDG-OU-002.vmware.com: akaher@vmware.com does not designate permitted sender hosts) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This patch is the extension of following upstream commit to fix the race condition between get_task_mm() and core dumping for IB->mlx4 and IB->mlx5 drivers: commit 04f5866e41fb ("coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping")' Thanks to Jason for pointing this. Signed-off-by: Ajay Kaher Reviewed-by: Jason Gunthorpe --- drivers/infiniband/hw/mlx4/main.c | 4 +++- drivers/infiniband/hw/mlx5/main.c | 3 +++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index 8d59a59..7ccf722 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -1172,6 +1172,8 @@ static void mlx4_ib_disassociate_ucontext(struct ib_ucontext *ibcontext) * mlx4_ib_vma_close(). */ down_write(&owning_mm->mmap_sem); + if (!mmget_still_valid(owning_mm)) + goto skip_mm; for (i = 0; i < HW_BAR_COUNT; i++) { vma = context->hw_bar_info[i].vma; if (!vma) @@ -1190,7 +1192,7 @@ static void mlx4_ib_disassociate_ucontext(struct ib_ucontext *ibcontext) /* context going to be destroyed, should not access ops any more */ context->hw_bar_info[i].vma->vm_ops = NULL; } - +skip_mm: up_write(&owning_mm->mmap_sem); mmput(owning_mm); put_task_struct(owning_process); diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index b1daf5c..f94df0e 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1307,6 +1307,8 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext) * mlx5_ib_vma_close. */ down_write(&owning_mm->mmap_sem); + if (!mmget_still_valid(owning_mm)) + goto skip_mm; list_for_each_entry_safe(vma_private, n, &context->vma_private_list, list) { vma = vma_private->vma; @@ -1321,6 +1323,7 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext) list_del(&vma_private->list); kfree(vma_private); } +skip_mm: up_write(&owning_mm->mmap_sem); mmput(owning_mm); put_task_struct(owning_process); -- 2.7.4