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[2/2] hugetlb: fix copy_huge_page_from_user contig page struct assumption

Message ID 20210217184926.33567-2-mike.kravetz@oracle.com
State Accepted
Commit 3272cfc2525b3a2810a59312d7a1e6f04a0ca3ef
Headers show
Series [1/2] hugetlb: fix update_and_free_page contig page struct assumption | expand

Commit Message

Mike Kravetz Feb. 17, 2021, 6:49 p.m. UTC 
page structs are not guaranteed to be contiguous for gigantic pages.
The routine copy_huge_page_from_user can encounter gigantic pages, yet it
assumes page structs are contiguous when copying pages from user space.

Since page structs for the target gigantic page are not contiguous,
the data copied from user space could overwrite other pages not
associated with the gigantic page and cause data corruption.

Non-contiguous page structs are generally not an issue.  However, they can
exist with a specific kernel configuration and hotplug operations.  For
example: Configure the kernel with CONFIG_SPARSEMEM and
!CONFIG_SPARSEMEM_VMEMMAP.  Then, hotplug add memory for the area where the
gigantic page will be allocated.

Fixes: 8fb5debc5fcd ("userfaultfd: hugetlbfs: add hugetlb_mcopy_atomic_pte for userfaultfd support")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: <stable@vger.kernel.org>
---
 mm/memory.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
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Patch

diff --git a/mm/memory.c b/mm/memory.c
index feff48e1465a..241bec4199b5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5173,17 +5173,19 @@  long copy_huge_page_from_user(struct page *dst_page,
 	void *page_kaddr;
 	unsigned long i, rc = 0;
 	unsigned long ret_val = pages_per_huge_page * PAGE_SIZE;
+	struct page *subpage = dst_page;
 
-	for (i = 0; i < pages_per_huge_page; i++) {
+	for (i = 0; i < pages_per_huge_page;
+	     i++, subpage = mem_map_next(subpage, dst_page, i)) {
 		if (allow_pagefault)
-			page_kaddr = kmap(dst_page + i);
+			page_kaddr = kmap(subpage);
 		else
-			page_kaddr = kmap_atomic(dst_page + i);
+			page_kaddr = kmap_atomic(subpage);
 		rc = copy_from_user(page_kaddr,
 				(const void __user *)(src + i * PAGE_SIZE),
 				PAGE_SIZE);
 		if (allow_pagefault)
-			kunmap(dst_page + i);
+			kunmap(subpage);
 		else
 			kunmap_atomic(page_kaddr);