1 files changed, 20 insertions, 10 deletions

diff --git a/mm/memory.c b/mm/memory.c
index e0555ddd71b5..13b1fe661d86 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2798,10 +2798,16 @@ static inline int pte_unmap_same(struct vm_fault *vmf)
 	return same;
 }
 
-static inline bool __wp_page_copy_user(struct page *dst, struct page *src,
-				       struct vm_fault *vmf)
+/*
+ * Return:
+ *	0:		copied succeeded
+ *	-EHWPOISON:	copy failed due to hwpoison in source page
+ *	-EAGAIN:	copied failed (some other reason)
+ */
+static inline int __wp_page_copy_user(struct page *dst, struct page *src,
+				      struct vm_fault *vmf)
 {
-	bool ret;
+	int ret;
 	void *kaddr;
 	void __user *uaddr;
 	bool locked = false;
@@ -2810,8 +2816,9 @@ static inline bool __wp_page_copy_user(struct page *dst, struct page *src,
 	unsigned long addr = vmf->address;
 
 	if (likely(src)) {
-		copy_user_highpage(dst, src, addr, vma);
-		return true;
+		if (copy_mc_user_highpage(dst, src, addr, vma))
+			return -EHWPOISON;
+		return 0;
 	}
 
 	/*
@@ -2838,7 +2845,7 @@ static inline bool __wp_page_copy_user(struct page *dst, struct page *src,
 			 * and update local tlb only
 			 */
 			update_mmu_tlb(vma, addr, vmf->pte);
-			ret = false;
+			ret = -EAGAIN;
 			goto pte_unlock;
 		}
 
@@ -2863,7 +2870,7 @@ static inline bool __wp_page_copy_user(struct page *dst, struct page *src,
 		if (!likely(pte_same(*vmf->pte, vmf->orig_pte))) {
 			/* The PTE changed under us, update local tlb */
 			update_mmu_tlb(vma, addr, vmf->pte);
-			ret = false;
+			ret = -EAGAIN;
 			goto pte_unlock;
 		}
 
@@ -2882,7 +2889,7 @@ warn:
 		}
 	}
 
-	ret = true;
+	ret = 0;
 
 pte_unlock:
 	if (locked)
@@ -3054,6 +3061,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
 	pte_t entry;
 	int page_copied = 0;
 	struct mmu_notifier_range range;
+	int ret;
 
 	delayacct_wpcopy_start();
 
@@ -3071,19 +3079,21 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
 		if (!new_page)
 			goto oom;
 
-		if (!__wp_page_copy_user(new_page, old_page, vmf)) {
+		ret = __wp_page_copy_user(new_page, old_page, vmf);
+		if (ret) {
 			/*
 			 * COW failed, if the fault was solved by other,
 			 * it's fine. If not, userspace would re-fault on
 			 * the same address and we will handle the fault
 			 * from the second attempt.
+			 * The -EHWPOISON case will not be retried.
 			 */
 			put_page(new_page);
 			if (old_page)
 				put_page(old_page);
 
 			delayacct_wpcopy_end();
-			return 0;
+			return ret == -EHWPOISON ? VM_FAULT_HWPOISON : 0;
 		}
 		kmsan_copy_page_meta(new_page, old_page);
 	}