mm/hwpoison: fix race between hugetlb free/demotion and memory_failure_hugetlb()

There is a race condition between memory_failure_hugetlb() and hugetlb
free/demotion, which causes setting PageHWPoison flag on the wrong page.
The one simple result is that wrong processes can be killed, but another
(more serious) one is that the actual error is left unhandled, so no one
prevents later access to it, and that might lead to more serious results
like consuming corrupted data.

Think about the below race window:

  CPU 1                                   CPU 2
  memory_failure_hugetlb
  struct page *head = compound_head(p);
                                          hugetlb page might be freed to
                                          buddy, or even changed to another
                                          compound page.

  get_hwpoison_page -- page is not what we want now...

The current code first does prechecks roughly and then reconfirms after
taking refcount, but it's found that it makes code overly complicated,
so move the prechecks in a single hugetlb_lock range.

A newly introduced function, try_memory_failure_hugetlb(), always takes
hugetlb_lock (even for non-hugetlb pages).  That can be improved, but
memory_failure() is rare in principle, so should not be a big problem.

Link: https://lkml.kernel.org/r/20220408135323.1559401-2-naoya.horiguchi@linux.dev
Fixes: 761ad8d7c7b5 ("mm: hwpoison: introduce memory_failure_hugetlb()")
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reported-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 113 insertions, 42 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f8ca7cca3c1a..3fc721789743 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6785,6 +6785,16 @@ int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
 	return ret;
 }
 
+int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
+{
+	int ret;
+
+	spin_lock_irq(&hugetlb_lock);
+	ret = __get_huge_page_for_hwpoison(pfn, flags);
+	spin_unlock_irq(&hugetlb_lock);
+	return ret;
+}
+
 void putback_active_hugepage(struct page *page)
 {
 	spin_lock_irq(&hugetlb_lock);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index dcb6bb9cf731..2020944398c9 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1498,50 +1498,113 @@ static int try_to_split_thp_page(struct page *page, const char *msg)
 	return 0;
 }
 
-static int memory_failure_hugetlb(unsigned long pfn, int flags)
+/*
+ * Called from hugetlb code with hugetlb_lock held.
+ *
+ * Return values:
+ *   0             - free hugepage
+ *   1             - in-use hugepage
+ *   2             - not a hugepage
+ *   -EBUSY        - the hugepage is busy (try to retry)
+ *   -EHWPOISON    - the hugepage is already hwpoisoned
+ */
+int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
+{
+	struct page *page = pfn_to_page(pfn);
+	struct page *head = compound_head(page);
+	int ret = 2;	/* fallback to normal page handling */
+	bool count_increased = false;
+
+	if (!PageHeadHuge(head))
+		goto out;
+
+	if (flags & MF_COUNT_INCREASED) {
+		ret = 1;
+		count_increased = true;
+	} else if (HPageFreed(head) || HPageMigratable(head)) {
+		ret = get_page_unless_zero(head);
+		if (ret)
+			count_increased = true;
+	} else {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	if (TestSetPageHWPoison(head)) {
+		ret = -EHWPOISON;
+		goto out;
+	}
+
+	return ret;
+out:
+	if (count_increased)
+		put_page(head);
+	return ret;
+}
+
+#ifdef CONFIG_HUGETLB_PAGE
+/*
+ * Taking refcount of hugetlb pages needs extra care about race conditions
+ * with basic operations like hugepage allocation/free/demotion.
+ * So some of prechecks for hwpoison (pinning, and testing/setting
+ * PageHWPoison) should be done in single hugetlb_lock range.
+ */
+static int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb)
 {
-	struct page *p = pfn_to_page(pfn);
-	struct page *head = compound_head(p);
 	int res;
+	struct page *p = pfn_to_page(pfn);
+	struct page *head;
 	unsigned long page_flags;
+	bool retry = true;
 
-	if (TestSetPageHWPoison(head)) {
-		pr_err("Memory failure: %#lx: already hardware poisoned\n",
-		       pfn);
-		res = -EHWPOISON;
-		if (flags & MF_ACTION_REQUIRED)
+	*hugetlb = 1;
+retry:
+	res = get_huge_page_for_hwpoison(pfn, flags);
+	if (res == 2) { /* fallback to normal page handling */
+		*hugetlb = 0;
+		return 0;
+	} else if (res == -EHWPOISON) {
+		pr_err("Memory failure: %#lx: already hardware poisoned\n", pfn);
+		if (flags & MF_ACTION_REQUIRED) {
+			head = compound_head(p);
 			res = kill_accessing_process(current, page_to_pfn(head), flags);
+		}
 		return res;
+	} else if (res == -EBUSY) {
+		if (retry) {
+			retry = false;
+			goto retry;
+		}
+		action_result(pfn, MF_MSG_UNKNOWN, MF_IGNORED);
+		return res;
+	}
+
+	head = compound_head(p);
+	lock_page(head);
+
+	if (hwpoison_filter(p)) {
+		ClearPageHWPoison(head);
+		res = -EOPNOTSUPP;
+		goto out;
 	}
 
 	num_poisoned_pages_inc();
 
-	if (!(flags & MF_COUNT_INCREASED)) {
-		res = get_hwpoison_page(p, flags);
-		if (!res) {
-			lock_page(head);
-			if (hwpoison_filter(p)) {
-				if (TestClearPageHWPoison(head))
-					num_poisoned_pages_dec();
-				unlock_page(head);
-				return -EOPNOTSUPP;
-			}
-			unlock_page(head);
-			res = MF_FAILED;
-			if (__page_handle_poison(p)) {
-				page_ref_inc(p);
-				res = MF_RECOVERED;
-			}
-			action_result(pfn, MF_MSG_FREE_HUGE, res);
-			return res == MF_RECOVERED ? 0 : -EBUSY;
-		} else if (res < 0) {
-			action_result(pfn, MF_MSG_UNKNOWN, MF_IGNORED);
-			return -EBUSY;
+	/*
+	 * Handling free hugepage.  The possible race with hugepage allocation
+	 * or demotion can be prevented by PageHWPoison flag.
+	 */
+	if (res == 0) {
+		unlock_page(head);
+		res = MF_FAILED;
+		if (__page_handle_poison(p)) {
+			page_ref_inc(p);
+			res = MF_RECOVERED;
 		}
+		action_result(pfn, MF_MSG_FREE_HUGE, res);
+		return res == MF_RECOVERED ? 0 : -EBUSY;
 	}
 
-	lock_page(head);
-
 	/*
 	 * The page could have changed compound pages due to race window.
 	 * If this happens just bail out.
@@ -1554,14 +1617,6 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
 
 	page_flags = head->flags;
 
-	if (hwpoison_filter(p)) {
-		if (TestClearPageHWPoison(head))
-			num_poisoned_pages_dec();
-		put_page(p);
-		res = -EOPNOTSUPP;
-		goto out;
-	}
-
 	/*
 	 * TODO: hwpoison for pud-sized hugetlb doesn't work right now, so
 	 * simply disable it. In order to make it work properly, we need
@@ -1588,6 +1643,12 @@ out:
 	unlock_page(head);
 	return res;
 }
+#else
+static inline int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb)
+{
+	return 0;
+}
+#endif
 
 static int memory_failure_dev_pagemap(unsigned long pfn, int flags,
 		struct dev_pagemap *pgmap)
@@ -1712,6 +1773,7 @@ int memory_failure(unsigned long pfn, int flags)
 	int res = 0;
 	unsigned long page_flags;
 	bool retry = true;
+	int hugetlb = 0;
 
 	if (!sysctl_memory_failure_recovery)
 		panic("Memory failure on page %lx", pfn);
@@ -1739,10 +1801,9 @@ int memory_failure(unsigned long pfn, int flags)
 	}
 
 try_again:
-	if (PageHuge(p)) {
-		res = memory_failure_hugetlb(pfn, flags);
+	res = try_memory_failure_hugetlb(pfn, flags, &hugetlb);
+	if (hugetlb)
 		goto unlock_mutex;
-	}
 
 	if (TestSetPageHWPoison(p)) {
 		pr_err("Memory failure: %#lx: already hardware poisoned\n",