linux-kernel - [4.9-stable PATCH 07/11] IB/core: disable memory registration of filesystem-dax vmas

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Date:   Fri, 23 Feb 2018 14:06:00 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     gregkh@...uxfoundation.org
Cc:     Sean Hefty <sean.hefty@...el.com>, Jan Kara <jack@...e.cz>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        linux-kernel@...r.kernel.org,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Jeff Moyer <jmoyer@...hat.com>, stable@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Inki Dae <inki.dae@...sung.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Mel Gorman <mgorman@...e.de>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: [4.9-stable PATCH 07/11] IB/core: disable memory registration of
 filesystem-dax vmas

commit 5f1d43de54164dcfb9bfa542fcc92c1e1a1b6c1d upstream.

Until there is a solution to the dma-to-dax vs truncate problem it is
not safe to allow RDMA to create long standing memory registrations
against filesytem-dax vmas.

Link: http://lkml.kernel.org/r/151068941011.7446.7766030590347262502.stgit@dwillia2-desk3.amr.corp.intel.com
Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings")
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Reported-by: Christoph Hellwig <hch@....de>
Reviewed-by: Christoph Hellwig <hch@....de>
Acked-by: Jason Gunthorpe <jgg@...lanox.com>
Acked-by: Doug Ledford <dledford@...hat.com>
Cc: Sean Hefty <sean.hefty@...el.com>
Cc: Hal Rosenstock <hal.rosenstock@...il.com>
Cc: Jeff Moyer <jmoyer@...hat.com>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc: Inki Dae <inki.dae@...sung.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Joonyoung Shim <jy0922.shim@...sung.com>
Cc: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Seung-Woo Kim <sw0312.kim@...sung.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
---
 drivers/infiniband/core/umem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index c22fde6207d1..8e973a2993a6 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -193,7 +193,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 	sg_list_start = umem->sg_head.sgl;
 
 	while (npages) {
-		ret = get_user_pages(cur_base,
+		ret = get_user_pages_longterm(cur_base,
 				     min_t(unsigned long, npages,
 					   PAGE_SIZE / sizeof (struct page *)),
 				     gup_flags, page_list, vma_list);