[PATCH mm-unstable v2] mm/hugetlb_vmemmap: fix memory loads ordering

[Yu Zhao <yuzhao@google.com>]

Using x86_64 as an example, for a 32KB struct page[] area describing a
2MB hugeTLB, HVO reduces the area to 4KB by the following steps:
1. Split the (r/w vmemmap) PMD mapping the area into 512 (r/w) PTEs;
2. For the 8 PTEs mapping the area, remap PTE 1-7 to the page mapped
   by PTE 0, and at the same time change the permission from r/w to
   r/o;
3. Free the pages PTE 1-7 used to map, hence the reduction from 32KB
   to 4KB.

However, the following race can happen due to improperly memory loads
ordering:
  CPU 1 (HVO)                     CPU 2 (speculative PFN walker)

  page_ref_freeze()
  synchronize_rcu()
                                  rcu_read_lock()
                                  page_is_fake_head() is false
  vmemmap_remap_pte()
  XXX: struct page[] becomes r/o

  page_ref_unfreeze()
                                  page_ref_count() is not zero

                                  atomic_add_unless(&page->_refcount)
                                  XXX: try to modify r/o struct page[]

Specifically, page_is_fake_head() must be ordered after
page_ref_count() on CPU 2 so that it can only return true for this
case, to avoid the later attempt to modify r/o struct page[].

This patch adds the missing memory barrier and makes the tests on
page_is_fake_head() and page_ref_count() done in the proper order.

Fixes: bd225530a4c7 ("mm/hugetlb_vmemmap: fix race with speculative PFN walkers")
Reported-by: Will Deacon <will@kernel.org>
Closes: https://lore.kernel.org/20241128142028.GA3506@willie-the-truck/
Signed-off-by: Yu Zhao <yuzhao@google.com>
---
 include/linux/page-flags.h | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/page_ref.h   |  2 +-
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 691506bdf2c5..16fa8f0cea02 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -225,11 +225,48 @@ static __always_inline const struct page *page_fixed_fake_head(const struct page
 	}
 	return page;
 }
+
+static __always_inline bool page_count_writable(const struct page *page, int u)
+{
+	if (!static_branch_unlikely(&hugetlb_optimize_vmemmap_key))
+		return true;
+
+	/*
+	 * The refcount check is ordered before the fake-head check to prevent
+	 * the following race:
+	 *   CPU 1 (HVO)                     CPU 2 (speculative PFN walker)
+	 *
+	 *   page_ref_freeze()
+	 *   synchronize_rcu()
+	 *                                   rcu_read_lock()
+	 *                                   page_is_fake_head() is false
+	 *   vmemmap_remap_pte()
+	 *   XXX: struct page[] becomes r/o
+	 *
+	 *   page_ref_unfreeze()
+	 *                                   page_ref_count() is not zero
+	 *
+	 *                                   atomic_add_unless(&page->_refcount)
+	 *                                   XXX: try to modify r/o struct page[]
+	 *
+	 * The refcount check also prevents modification attempts to other (r/o)
+	 * tail pages that are not fake heads.
+	 */
+	if (atomic_read_acquire(&page->_refcount) == u)
+		return false;
+
+	return page_fixed_fake_head(page) == page;
+}
 #else
 static inline const struct page *page_fixed_fake_head(const struct page *page)
 {
 	return page;
 }
+
+static inline bool page_count_writable(const struct page *page, int u)
+{
+	return true;
+}
 #endif
 
 static __always_inline int page_is_fake_head(const struct page *page)
diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index 8c236c651d1d..544150d1d5fd 100644
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -234,7 +234,7 @@ static inline bool page_ref_add_unless(struct page *page, int nr, int u)
 
 	rcu_read_lock();
 	/* avoid writing to the vmemmap area being remapped */
-	if (!page_is_fake_head(page) && page_ref_count(page) != u)
+	if (page_count_writable(page, u))
 		ret = atomic_add_unless(&page->_refcount, nr, u);
 	rcu_read_unlock();
 
-- 
2.47.1.613.gc27f4b7a9f-goog