[PATCH v2] mm, hwpoison: Try to recover from copy-on write faults

[Tony Luck]

If the kernel is copying a page as the result of a copy-on-write
fault and runs into an uncorrectable error, Linux will crash because
it does not have recovery code for this case where poison is consumed
by the kernel.

It is easy to set up a test case. Just inject an error into a private
page, fork(2), and have the child process write to the page.

I wrapped that neatly into a test at:

  git://git.kernel.org/pub/scm/linux/kernel/git/aegl/ras-tools.git

just enable ACPI error injection and run:

  # ./einj_mem-uc -f copy-on-write

Add a new copy_user_highpage_mc() function that uses copy_mc_to_kernel()
on architectures where that is available (currently x86 and powerpc).
When an error is detected during the page copy, return VM_FAULT_HWPOISON
to caller of wp_page_copy(). This propagates up the call stack. Both x86
and powerpc have code in their fault handler to deal with this code by
sending a SIGBUS to the application.

Note that this patch avoids a system crash and signals the process that
triggered the copy-on-write action. It does not take any action for the
memory error that is still in the shared page. To handle that a call to
memory_failure() is needed. But this cannot be done from wp_page_copy()
because it holds mmap_lock(). Perhaps the architecture fault handlers
can deal with this loose end in a subsequent patch?

On Intel/x86 this loose end will often be handled automatically because
the memory controller provides an additional notification of the h/w
poison in memory, the handler for this will call memory_failure(). This
isn't a 100% solution. If there are multiple errors, not all may be
logged in this way.

Signed-off-by: Tony Luck <tony.luck at intel.com>

---
Changes in V2:
   Naoya Horiguchi:
	1) Use -EHWPOISON error code instead of minus one.
	2) Poison path needs also to deal with old_page
   Tony Luck:
	Rewrote commit message
	Added some powerpc folks to Cc: list
---
 include/linux/highmem.h | 19 +++++++++++++++++++
 mm/memory.c             | 28 +++++++++++++++++++---------
 2 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index e9912da5441b..5967541fbf0e 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -319,6 +319,25 @@ static inline void copy_user_highpage(struct page *to, struct page *from,
 
 #endif
 
+static inline int copy_user_highpage_mc(struct page *to, struct page *from,
+					unsigned long vaddr, struct vm_area_struct *vma)
+{
+	unsigned long ret = 0;
+#ifdef copy_mc_to_kernel
+	char *vfrom, *vto;
+
+	vfrom = kmap_local_page(from);
+	vto = kmap_local_page(to);
+	ret = copy_mc_to_kernel(vto, vfrom, PAGE_SIZE);
+	kunmap_local(vto);
+	kunmap_local(vfrom);
+#else
+	copy_user_highpage(to, from, vaddr, vma);
+#endif
+
+	return ret;
+}
+
 #ifndef __HAVE_ARCH_COPY_HIGHPAGE
 
 static inline void copy_highpage(struct page *to, struct page *from)
diff --git a/mm/memory.c b/mm/memory.c
index f88c351aecd4..a32556c9b689 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2848,8 +2848,14 @@ 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:
+ *	-EHWPOISON:	copy failed due to hwpoison in source page
+ *	0:		copied failed (some other reason)
+ *	1:		copied succeeded
+ */
+static inline int __wp_page_copy_user(struct page *dst, struct page *src,
+				      struct vm_fault *vmf)
 {
 	bool ret;
 	void *kaddr;
@@ -2860,8 +2866,9 @@ 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_user_highpage_mc(dst, src, addr, vma))
+			return -EHWPOISON;
+		return 1;
 	}
 
 	/*
@@ -2888,7 +2895,7 @@ 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 = 0;
 			goto pte_unlock;
 		}
 
@@ -2913,7 +2920,7 @@ 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 = 0;
 			goto pte_unlock;
 		}
 
@@ -2932,7 +2939,7 @@ static inline bool __wp_page_copy_user(struct page *dst, struct page *src,
 		}
 	}
 
-	ret = true;
+	ret = 1;
 
 pte_unlock:
 	if (locked)
@@ -3104,6 +3111,7 @@ 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();
 
@@ -3121,19 +3129,21 @@ 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 <= 0) {
 			/*
 			 * 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);
 	}
-- 
2.37.3