linux-kernel - [PATCH 5.13 385/800] mm/shmem: fix shmem

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Date:   Mon, 12 Jul 2021 08:06:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaohe Lin <linmiaohe@...wei.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Dennis Zhou <dennis@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Alex Shi <alexs@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Minchan Kim <minchan@...nel.org>,
        Wei Yang <richard.weiyang@...il.com>,
        Yang Shi <shy828301@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Yu Zhao <yuzhao@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 385/800] mm/shmem: fix shmem_swapin() race with swapoff

From: Miaohe Lin <linmiaohe@...wei.com>

[ Upstream commit 2efa33fc7f6ec94a3a538c1a264273c889be2b36 ]

When I was investigating the swap code, I found the below possible race
window:

CPU 1                                         CPU 2
-----                                         -----
shmem_swapin
  swap_cluster_readahead
    if (likely(si->flags & (SWP_BLKDEV | SWP_FS_OPS))) {
                                              swapoff
                                                ..
                                                si->swap_file = NULL;
                                                ..
    struct inode *inode = si->swap_file->f_mapping->host;[oops!]

Close this race window by using get/put_swap_device() to guard against
concurrent swapoff.

Link: https://lkml.kernel.org/r/20210426123316.806267-5-linmiaohe@huawei.com
Fixes: 8fd2e0b505d1 ("mm: swap: check if swap backing device is congested or not")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: "Huang, Ying" <ying.huang@...el.com>
Cc: Dennis Zhou <dennis@...nel.org>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Alex Shi <alexs@...nel.org>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Wei Yang <richard.weiyang@...il.com>
Cc: Yang Shi <shy828301@...il.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Yu Zhao <yuzhao@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 mm/shmem.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 5d46611cba8d..53f21016608e 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1696,7 +1696,8 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
 	struct address_space *mapping = inode->i_mapping;
 	struct shmem_inode_info *info = SHMEM_I(inode);
 	struct mm_struct *charge_mm = vma ? vma->vm_mm : current->mm;
-	struct page *page;
+	struct swap_info_struct *si;
+	struct page *page = NULL;
 	swp_entry_t swap;
 	int error;
 
@@ -1704,6 +1705,12 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
 	swap = radix_to_swp_entry(*pagep);
 	*pagep = NULL;
 
+	/* Prevent swapoff from happening to us. */
+	si = get_swap_device(swap);
+	if (!si) {
+		error = EINVAL;
+		goto failed;
+	}
 	/* Look it up and read it in.. */
 	page = lookup_swap_cache(swap, NULL, 0);
 	if (!page) {
@@ -1765,6 +1772,8 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
 	swap_free(swap);
 
 	*pagep = page;
+	if (si)
+		put_swap_device(si);
 	return 0;
 failed:
 	if (!shmem_confirm_swap(mapping, index, swap))
@@ -1775,6 +1784,9 @@ unlock:
 		put_page(page);
 	}
 
+	if (si)
+		put_swap_device(si);
+
 	return error;
 }
 
-- 
2.30.2