Merge tag 'mm-hotfixes-stable-2023-02-13-13-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "Twelve hotfixes, mostly against mm/.

  Five of these fixes are cc:stable"

* tag 'mm-hotfixes-stable-2023-02-13-13-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  of: reserved_mem: Have kmemleak ignore dynamically allocated reserved mem
  scripts/gdb: fix 'lx-current' for x86
  lib: parser: optimize match_NUMBER apis to use local array
  mm: shrinkers: fix deadlock in shrinker debugfs
  mm: hwpoison: support recovery from ksm_might_need_to_copy()
  kasan: fix Oops due to missing calls to kasan_arch_is_ready()
  revert "squashfs: harden sanity check in squashfs_read_xattr_id_table"
  fsdax: dax_unshare_iter() should return a valid length
  mm/gup: add folio to list when folio_isolate_lru() succeed
  aio: fix mremap after fork null-deref
  mailmap: add entry for Alexander Mikhalitsyn
  mm: extend max struct page size for kmsan

9 files changed, 57 insertions, 16 deletions

diff --git a/mm/gup.c b/mm/gup.c
index f45a3a5be53a..7c034514ddd8 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1914,7 +1914,7 @@ static unsigned long collect_longterm_unpinnable_pages(
 			drain_allow = false;
 		}
 
-		if (!folio_isolate_lru(folio))
+		if (folio_isolate_lru(folio))
 			continue;
 
 		list_add_tail(&folio->lru, movable_page_list);
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 833bf2cfd2a3..21e66d7f261d 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -246,6 +246,9 @@ bool __kasan_slab_free(struct kmem_cache *cache, void *object,
 
 static inline bool ____kasan_kfree_large(void *ptr, unsigned long ip)
 {
+	if (!kasan_arch_is_ready())
+		return false;
+
 	if (ptr != page_address(virt_to_head_page(ptr))) {
 		kasan_report_invalid_free(ptr, ip, KASAN_REPORT_INVALID_FREE);
 		return true;
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index b076f597a378..cb762982c8ba 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -191,7 +191,12 @@ bool kasan_check_range(unsigned long addr, size_t size, bool write,
 
 bool kasan_byte_accessible(const void *addr)
 {
-	s8 shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(addr));
+	s8 shadow_byte;
+
+	if (!kasan_arch_is_ready())
+		return true;
+
+	shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(addr));
 
 	return shadow_byte >= 0 && shadow_byte < KASAN_GRANULE_SIZE;
 }
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 2fba1f51f042..15cfb34d16a1 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -291,6 +291,9 @@ int kasan_populate_vmalloc(unsigned long addr, unsigned long size)
 	unsigned long shadow_start, shadow_end;
 	int ret;
 
+	if (!kasan_arch_is_ready())
+		return 0;
+
 	if (!is_vmalloc_or_module_addr((void *)addr))
 		return 0;
 
@@ -459,6 +462,9 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
 	unsigned long region_start, region_end;
 	unsigned long size;
 
+	if (!kasan_arch_is_ready())
+		return;
+
 	region_start = ALIGN(start, KASAN_MEMORY_PER_SHADOW_PAGE);
 	region_end = ALIGN_DOWN(end, KASAN_MEMORY_PER_SHADOW_PAGE);
 
@@ -502,6 +508,9 @@ void *__kasan_unpoison_vmalloc(const void *start, unsigned long size,
 	 * with setting memory tags, so the KASAN_VMALLOC_INIT flag is ignored.
 	 */
 
+	if (!kasan_arch_is_ready())
+		return (void *)start;
+
 	if (!is_vmalloc_or_module_addr(start))
 		return (void *)start;
 
@@ -524,6 +533,9 @@ void *__kasan_unpoison_vmalloc(const void *start, unsigned long size,
  */
 void __kasan_poison_vmalloc(const void *start, unsigned long size)
 {
+	if (!kasan_arch_is_ready())
+		return;
+
 	if (!is_vmalloc_or_module_addr(start))
 		return;
 
diff --git a/mm/ksm.c b/mm/ksm.c
index dd02780c387f..addf490da146 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2629,8 +2629,11 @@ struct page *ksm_might_need_to_copy(struct page *page,
 		new_page = NULL;
 	}
 	if (new_page) {
-		copy_user_highpage(new_page, page, address, vma);
-
+		if (copy_mc_user_highpage(new_page, page, address, vma)) {
+			put_page(new_page);
+			memory_failure_queue(page_to_pfn(page), 0);
+			return ERR_PTR(-EHWPOISON);
+		}
 		SetPageDirty(new_page);
 		__SetPageUptodate(new_page);
 		__SetPageLocked(new_page);
diff --git a/mm/memory.c b/mm/memory.c
index 3e836fecd035..f526b9152bef 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3840,6 +3840,9 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 		if (unlikely(!page)) {
 			ret = VM_FAULT_OOM;
 			goto out_page;
+		} else if (unlikely(PTR_ERR(page) == -EHWPOISON)) {
+			ret = VM_FAULT_HWPOISON;
+			goto out_page;
 		}
 		folio = page_folio(page);
 
diff --git a/mm/shrinker_debug.c b/mm/shrinker_debug.c
index b05295bab322..39c3491e28a3 100644
--- a/mm/shrinker_debug.c
+++ b/mm/shrinker_debug.c
@@ -246,18 +246,21 @@ int shrinker_debugfs_rename(struct shrinker *shrinker, const char *fmt, ...)
 }
 EXPORT_SYMBOL(shrinker_debugfs_rename);
 
-void shrinker_debugfs_remove(struct shrinker *shrinker)
+struct dentry *shrinker_debugfs_remove(struct shrinker *shrinker)
 {
+	struct dentry *entry = shrinker->debugfs_entry;
+
 	lockdep_assert_held(&shrinker_rwsem);
 
 	kfree_const(shrinker->name);
 	shrinker->name = NULL;
 
-	if (!shrinker->debugfs_entry)
-		return;
+	if (entry) {
+		ida_free(&shrinker_debugfs_ida, shrinker->debugfs_id);
+		shrinker->debugfs_entry = NULL;
+	}
 
-	debugfs_remove_recursive(shrinker->debugfs_entry);
-	ida_free(&shrinker_debugfs_ida, shrinker->debugfs_id);
+	return entry;
 }
 
 static int __init shrinker_debugfs_init(void)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 4fa440e87cd6..eb9b0bf1fcdd 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1764,12 +1764,15 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
 	struct page *swapcache;
 	spinlock_t *ptl;
 	pte_t *pte, new_pte;
+	bool hwposioned = false;
 	int ret = 1;
 
 	swapcache = page;
 	page = ksm_might_need_to_copy(page, vma, addr);
 	if (unlikely(!page))
 		return -ENOMEM;
+	else if (unlikely(PTR_ERR(page) == -EHWPOISON))
+		hwposioned = true;
 
 	pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 	if (unlikely(!pte_same_as_swp(*pte, swp_entry_to_pte(entry)))) {
@@ -1777,15 +1780,19 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
 		goto out;
 	}
 
-	if (unlikely(!PageUptodate(page))) {
-		pte_t pteval;
+	if (unlikely(hwposioned || !PageUptodate(page))) {
+		swp_entry_t swp_entry;
 
 		dec_mm_counter(vma->vm_mm, MM_SWAPENTS);
-		pteval = swp_entry_to_pte(make_swapin_error_entry());
-		set_pte_at(vma->vm_mm, addr, pte, pteval);
-		swap_free(entry);
+		if (hwposioned) {
+			swp_entry = make_hwpoison_entry(swapcache);
+			page = swapcache;
+		} else {
+			swp_entry = make_swapin_error_entry();
+		}
+		new_pte = swp_entry_to_pte(swp_entry);
 		ret = 0;
-		goto out;
+		goto setpte;
 	}
 
 	/* See do_swap_page() */
@@ -1817,6 +1824,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
 		new_pte = pte_mksoft_dirty(new_pte);
 	if (pte_swp_uffd_wp(*pte))
 		new_pte = pte_mkuffd_wp(new_pte);
+setpte:
 	set_pte_at(vma->vm_mm, addr, pte, new_pte);
 	swap_free(entry);
 out:
diff --git a/mm/vmscan.c b/mm/vmscan.c
index bf3eedf0209c..5b7b8d4f5297 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -741,6 +741,8 @@ EXPORT_SYMBOL(register_shrinker);
  */
 void unregister_shrinker(struct shrinker *shrinker)
 {
+	struct dentry *debugfs_entry;
+
 	if (!(shrinker->flags & SHRINKER_REGISTERED))
 		return;
 
@@ -749,9 +751,11 @@ void unregister_shrinker(struct shrinker *shrinker)
 	shrinker->flags &= ~SHRINKER_REGISTERED;
 	if (shrinker->flags & SHRINKER_MEMCG_AWARE)
 		unregister_memcg_shrinker(shrinker);
-	shrinker_debugfs_remove(shrinker);
+	debugfs_entry = shrinker_debugfs_remove(shrinker);
 	up_write(&shrinker_rwsem);
 
+	debugfs_remove_recursive(debugfs_entry);
+
 	kfree(shrinker->nr_deferred);
 	shrinker->nr_deferred = NULL;
 }