linux-kernel - [PATCH 2/8] mm: memory-failure: ensure moving HWPoison flag to the raw error pages

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Message-ID: <20230708085744.3599311-3-linmiaohe@huawei.com>
Date:   Sat, 8 Jul 2023 16:57:38 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <naoya.horiguchi@....com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH 2/8] mm: memory-failure: ensure moving HWPoison flag to the raw error pages

If hugetlb_vmemmap_optimized is enabled, folio_clear_hugetlb_hwpoison()
called from try_memory_failure_hugetlb() won't transfer HWPoison flag to
subpages while folio's HWPoison flag is cleared. So when trying to free
this hugetlb page into buddy, folio_clear_hugetlb_hwpoison() is not called
to move HWPoison flag from head page to the raw error pages even if now
hugetlb_vmemmap_optimized is cleared. This will results in HWPoisoned page
being used again and raw_hwp_page leak.

Fixes: ac5fcde0a96a ("mm, hwpoison: make unpoison aware of raw error info in hwpoisoned hugepage")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/memory-failure.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index d21ee27ad412..c155122e3c66 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1913,6 +1913,8 @@ void folio_clear_hugetlb_hwpoison(struct folio *folio)
 {
 	if (folio_test_hugetlb_raw_hwp_unreliable(folio))
 		return;
+	if (folio_test_hugetlb_vmemmap_optimized(folio))
+		return;
 	folio_clear_hwpoison(folio);
 	folio_free_raw_hwp(folio, true);
 }
-- 
2.33.0