linux-kernel - [PATCH 5.15 09/73] mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic

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Message-Id: <20220902121404.745542492@linuxfoundation.org>
Date:   Fri,  2 Sep 2022 14:18:33 +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>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Peter Xu <peterx@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 5.15 09/73] mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte

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

commit ab74ef708dc51df7cf2b8a890b9c6990fac5c0c6 upstream.

In MCOPY_ATOMIC_CONTINUE case with a non-shared VMA, pages in the page
cache are installed in the ptes.  But hugepage_add_new_anon_rmap is called
for them mistakenly because they're not vm_shared.  This will corrupt the
page->mapping used by page cache code.

Link: https://lkml.kernel.org/r/20220712130542.18836-1-linmiaohe@huawei.com
Fixes: f619147104c8 ("userfaultfd: add UFFDIO_CONTINUE ioctl")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
Cc: Axel Rasmussen <axelrasmussen@...gle.com>
Cc: Peter Xu <peterx@...hat.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 mm/hugetlb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5371,7 +5371,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_s
 	if (!huge_pte_none(huge_ptep_get(dst_pte)))
 		goto out_release_unlock;
 
-	if (vm_shared) {
+	if (page_in_pagecache) {
 		page_dup_rmap(page, true);
 	} else {
 		ClearHPageRestoreReserve(page);