[merged mm-hotfixes-stable] mm-use-aligned-address-in-clear_gigantic_page.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-use-aligned-address-in-clear_gigantic_page.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: use aligned address in clear_gigantic_page()
has been removed from the -mm tree.  Its filename was
     mm-use-aligned-address-in-clear_gigantic_page.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: mm: use aligned address in clear_gigantic_page()
Date: Mon, 28 Oct 2024 22:56:55 +0800

In current kernel, hugetlb_no_page() calls folio_zero_user() with the
fault address.  Where the fault address may be not aligned with the huge
page size.  Then, folio_zero_user() may call clear_gigantic_page() with
the address, while clear_gigantic_page() requires the address to be huge
page size aligned.  So, this may cause memory corruption or information
leak, addtional, use more obvious naming 'addr_hint' instead of 'addr' for
clear_gigantic_page().

Link: https://lkml.kernel.org/r/20241028145656.932941-1-wangkefeng.wang@huawei.com
Fixes: 78fefd04c123 ("mm: memory: convert clear_huge_page() to folio_zero_user()")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/hugetlbfs/inode.c |    2 +-
 mm/memory.c          |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

--- a/fs/hugetlbfs/inode.c~mm-use-aligned-address-in-clear_gigantic_page
+++ a/fs/hugetlbfs/inode.c
@@ -825,7 +825,7 @@ static long hugetlbfs_fallocate(struct f
 			error = PTR_ERR(folio);
 			goto out;
 		}
-		folio_zero_user(folio, ALIGN_DOWN(addr, hpage_size));
+		folio_zero_user(folio, addr);
 		__folio_mark_uptodate(folio);
 		error = hugetlb_add_to_page_cache(folio, mapping, index);
 		if (unlikely(error)) {
--- a/mm/memory.c~mm-use-aligned-address-in-clear_gigantic_page
+++ a/mm/memory.c
@@ -6815,9 +6815,10 @@ static inline int process_huge_page(
 	return 0;
 }
 
-static void clear_gigantic_page(struct folio *folio, unsigned long addr,
+static void clear_gigantic_page(struct folio *folio, unsigned long addr_hint,
 				unsigned int nr_pages)
 {
+	unsigned long addr = ALIGN_DOWN(addr_hint, folio_size(folio));
 	int i;
 
 	might_sleep();
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-dont-try-thp-align-for-fs-without-get_unmapped_area.patch