+ mm-memory-failurec-add-hwpoison_filter-for-soft-offline.patch added to mm-unstable branch

+ mm-memory-failurec-add-hwpoison_filter-for-soft-offline.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/memory-failure.c: add hwpoison_filter for soft offline
has been added to the -mm mm-unstable branch.  Its filename is
     mm-memory-failurec-add-hwpoison_filter-for-soft-offline.patch

This patch should soon appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: zhenwei pi <pizhenwei@bytedance.com>
Subject: mm/memory-failure.c: add hwpoison_filter for soft offline

hwpoison_filter is missing in the soft offline path, this leads an issue:
after enabling the corrupt filter, the user process still has a chance to
inject hwpoison fault by madvise(addr, len, MADV_SOFT_OFFLINE) at PFN
which is expected to reject.

Also do a minor change in comment of memory_failure().

Link: https://lkml.kernel.org/r/20220509105641.491313-4-pizhenwei@bytedance.com
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory-failure.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

--- a/mm/memory-failure.c~mm-memory-failurec-add-hwpoison_filter-for-soft-offline
+++ a/mm/memory-failure.c
@@ -1751,7 +1751,7 @@ static DEFINE_MUTEX(mf_mutex);
  * enabled and no spinlocks hold.
  *
  * Return: 0 for successfully handled the memory error,
- *         -EOPNOTSUPP for memory_filter() filtered the error event,
+ *         -EOPNOTSUPP for hwpoison_filter() filtered the error event,
  *         < 0(except -EOPNOTSUPP) on failure.
  */
 int memory_failure(unsigned long pfn, int flags)
@@ -2295,7 +2295,9 @@ static void put_ref_page(struct page *pa
  * @pfn: pfn to soft-offline
  * @flags: flags. Same as memory_failure().
  *
- * Returns 0 on success, otherwise negated errno.
+ * Returns 0 on success
+ *         -EOPNOTSUPP for hwpoison_filter() filtered the error event
+ *         < 0 otherwise negated errno.
  *
  * Soft offline a page, by migration or invalidation,
  * without killing anything. This is for the case when
@@ -2346,6 +2348,16 @@ retry:
 	ret = get_hwpoison_page(page, flags | MF_SOFT_OFFLINE);
 	put_online_mems();
 
+	if (hwpoison_filter(page)) {
+		if (ret > 0)
+			put_page(page);
+		else
+			put_ref_page(ref_page);
+
+		mutex_unlock(&mf_mutex);
+		return -EOPNOTSUPP;
+	}
+
 	if (ret > 0) {
 		ret = soft_offline_in_use_page(page);
 	} else if (ret == 0) {
_

Patches currently in -mm which might be from pizhenwei@bytedance.com are

mm-memory-failurec-move-clear_hwpoisoned_pages.patch
mm-memory-failurec-simplify-num_poisoned_pages_dec.patch
mm-memory-failurec-add-hwpoison_filter-for-soft-offline.patch
mm-hwpoison-disable-hwpoison-filter-during-removing.patch
mm-memory-failurec-simplify-num_poisoned_pages_inc-dec.patch