Merge tag 'mm-hotfixes-stable-2023-03-04-13-12' of...

Merge tag 'mm-hotfixes-stable-2023-03-04-13-12' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "17 hotfixes.

  Eight are for MM and seven are for other parts of the kernel. Seven
  are cc:stable and eight address post-6.3 issues or were judged
  unsuitable for -stable backporting"

* tag 'mm-hotfixes-stable-2023-03-04-13-12' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  mailmap: map Dikshita Agarwal's old address to his current one
  mailmap: map Vikash Garodia's old address to his current one
  fs/cramfs/inode.c: initialize file_ra_state
  fs: hfsplus: fix UAF issue in hfsplus_put_super
  panic: fix the panic_print NMI backtrace setting
  lib: parser: update documentation for match_NUMBER functions
  kasan, x86: don't rename memintrinsics in uninstrumented files
  kasan: test: fix test for new meminstrinsic instrumentation
  kasan: treat meminstrinsic as builtins in uninstrumented files
  kasan: emit different calls for instrumentable memintrinsics
  ocfs2: fix non-auto defrag path not working issue
  ocfs2: fix defrag path triggering jbd2 ASSERT
  mailmap: map Georgi Djakov's old Linaro address to his current one
  mm/hwpoison: convert TTU_IGNORE_HWPOISON to TTU_HWPOISON
  lib/zlib: DFLTCC deflate does not write all available bits for Z_NO_FLUSH
  mm/damon/paddr: fix missing folio_put()
  mm/mremap: fix dup_anon_vma() in vma_merge() case 4

.mailmap

@@ -121,6 +121,7 @@ Dengcheng Zhu <dzhu@wavecomp.com> <dengcheng.zhu@gmail.com>
 Dengcheng Zhu <dzhu@wavecomp.com> <dengcheng.zhu@imgtec.com>
 Dengcheng Zhu <dzhu@wavecomp.com> <dengcheng.zhu@mips.com>
 <dev.kurt@vandijck-laurijssen.be> <kurt.van.dijck@eia.be>
+Dikshita Agarwal <dikshita@qti.qualcomm.com> <dikshita@codeaurora.org>
 Dmitry Baryshkov <dbaryshkov@gmail.com>
 Dmitry Baryshkov <dbaryshkov@gmail.com> <[dbaryshkov@gmail.com]>
 Dmitry Baryshkov <dbaryshkov@gmail.com> <dmitry_baryshkov@mentor.com>
@@ -150,6 +151,7 @@ Gao Xiang <xiang@kernel.org> <gaoxiang25@huawei.com>
 Gao Xiang <xiang@kernel.org> <hsiangkao@aol.com>
 Gao Xiang <xiang@kernel.org> <hsiangkao@linux.alibaba.com>
 Gao Xiang <xiang@kernel.org> <hsiangkao@redhat.com>
+Georgi Djakov <djakov@kernel.org> <georgi.djakov@linaro.org>
 Gerald Schaefer <gerald.schaefer@linux.ibm.com> <geraldsc@de.ibm.com>
 Gerald Schaefer <gerald.schaefer@linux.ibm.com> <gerald.schaefer@de.ibm.com>
 Gerald Schaefer <gerald.schaefer@linux.ibm.com> <geraldsc@linux.vnet.ibm.com>
@@ -441,6 +443,7 @@ Vasily Averin <vasily.averin@linux.dev> <vvs@openvz.org>
 Vasily Averin <vasily.averin@linux.dev> <vvs@parallels.com>
 Vasily Averin <vasily.averin@linux.dev> <vvs@sw.ru>
 Valentin Schneider <vschneid@redhat.com> <valentin.schneider@arm.com>
+Vikash Garodia <quic_vgarodia@quicinc.com> <vgarodia@codeaurora.org>
 Vinod Koul <vkoul@kernel.org> <vinod.koul@intel.com>
 Vinod Koul <vkoul@kernel.org> <vinod.koul@linux.intel.com>
 Vinod Koul <vkoul@kernel.org> <vkoul@infradead.org>

arch/x86/include/asm/string_64.h

@@ -85,25 +85,6 @@ char *strcpy(char *dest, const char *src);
 char *strcat(char *dest, const char *src);
 int strcmp(const char *cs, const char *ct);
 
-#if (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
-/*
- * For files that not instrumented (e.g. mm/slub.c) we
- * should use not instrumented version of mem* functions.
- */
-
-#undef memcpy
-#define memcpy(dst, src, len) __memcpy(dst, src, len)
-#undef memmove
-#define memmove(dst, src, len) __memmove(dst, src, len)
-#undef memset
-#define memset(s, c, n) __memset(s, c, n)
-
-#ifndef __NO_FORTIFY
-#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
-#endif
-
-#endif
-
 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
 #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
 void __memcpy_flushcache(void *dst, const void *src, size_t cnt);

fs/cramfs/inode.c

@@ -183,7 +183,7 @@ static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset,
 				unsigned int len)
 {
 	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
-	struct file_ra_state ra;
+	struct file_ra_state ra = {};
 	struct page *pages[BLKS_PER_BUF];
 	unsigned i, blocknr, buffer;
 	unsigned long devsize;

fs/hfsplus/super.c

@@ -295,11 +295,11 @@ static void hfsplus_put_super(struct super_block *sb)
 		hfsplus_sync_fs(sb, 1);
 	}
 
+	iput(sbi->alloc_file);
+	iput(sbi->hidden_dir);
 	hfs_btree_close(sbi->attr_tree);
 	hfs_btree_close(sbi->cat_tree);
 	hfs_btree_close(sbi->ext_tree);
-	iput(sbi->alloc_file);
-	iput(sbi->hidden_dir);
 	kfree(sbi->s_vhdr_buf);
 	kfree(sbi->s_backup_vhdr_buf);
 	unload_nls(sbi->nls);

fs/ocfs2/move_extents.c

@@ -105,14 +105,6 @@ static int __ocfs2_move_extent(handle_t *handle,
 	 */
 	replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
 
-	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
-				      context->et.et_root_bh,
-				      OCFS2_JOURNAL_ACCESS_WRITE);
-	if (ret) {
-		mlog_errno(ret);
-		goto out;
-	}
-
 	ret = ocfs2_split_extent(handle, &context->et, path, index,
 				 &replace_rec, context->meta_ac,
 				 &context->dealloc);
@@ -121,8 +113,6 @@ static int __ocfs2_move_extent(handle_t *handle,
 		goto out;
 	}
 
-	ocfs2_journal_dirty(handle, context->et.et_root_bh);
-
 	context->new_phys_cpos = new_p_cpos;
 
 	/*
@@ -444,7 +434,7 @@ static int ocfs2_find_victim_alloc_group(struct inode *inode,
 			bg = (struct ocfs2_group_desc *)gd_bh->b_data;
 
 			if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
-						le16_to_cpu(bg->bg_bits))) {
+						(le16_to_cpu(bg->bg_bits) << bits_per_unit))) {
 
 				*ret_bh = gd_bh;
 				*vict_bit = (vict_blkno - blkno) >>
@@ -559,6 +549,7 @@ static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
 			last_free_bits++;
 
 		if (last_free_bits == move_len) {
+			i -= move_len;
 			*goal_bit = i;
 			*phys_cpos = base_cpos + i;
 			break;
@@ -1030,18 +1021,19 @@ int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
 
 	context->range = &range;
 
+	/*
+	 * ok, the default theshold for the defragmentation
+	 * is 1M, since our maximum clustersize was 1M also.
+	 * any thought?
+	 */
+	if (!range.me_threshold)
+		range.me_threshold = 1024 * 1024;
+
+	if (range.me_threshold > i_size_read(inode))
+		range.me_threshold = i_size_read(inode);
+
 	if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
 		context->auto_defrag = 1;
-		/*
-		 * ok, the default theshold for the defragmentation
-		 * is 1M, since our maximum clustersize was 1M also.
-		 * any thought?
-		 */
-		if (!range.me_threshold)
-			range.me_threshold = 1024 * 1024;
-
-		if (range.me_threshold > i_size_read(inode))
-			range.me_threshold = i_size_read(inode);
 
 		if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
 			context->partial = 1;

include/linux/rmap.h

@@ -94,7 +94,7 @@ enum ttu_flags {
 	TTU_SPLIT_HUGE_PMD	= 0x4,	/* split huge PMD if any */
 	TTU_IGNORE_MLOCK	= 0x8,	/* ignore mlock */
 	TTU_SYNC		= 0x10,	/* avoid racy checks with PVMW_SYNC */
-	TTU_IGNORE_HWPOISON	= 0x20,	/* corrupted page is recoverable */
+	TTU_HWPOISON		= 0x20,	/* do convert pte to hwpoison entry */
 	TTU_BATCH_FLUSH		= 0x40,	/* Batch TLB flushes where possible
 					 * and caller guarantees they will
 					 * do a final flush if necessary */

kernel/panic.c

@@ -212,9 +212,6 @@ static void panic_print_sys_info(bool console_flush)
 		return;
 	}
 
-	if (panic_print & PANIC_PRINT_ALL_CPU_BT)
-		trigger_all_cpu_backtrace();
-
 	if (panic_print & PANIC_PRINT_TASK_INFO)
 		show_state();
 
@@ -244,6 +241,30 @@ void check_panic_on_warn(const char *origin)
 		      origin, limit);
 }
 
+/*
+ * Helper that triggers the NMI backtrace (if set in panic_print)
+ * and then performs the secondary CPUs shutdown - we cannot have
+ * the NMI backtrace after the CPUs are off!
+ */
+static void panic_other_cpus_shutdown(bool crash_kexec)
+{
+	if (panic_print & PANIC_PRINT_ALL_CPU_BT)
+		trigger_all_cpu_backtrace();
+
+	/*
+	 * Note that smp_send_stop() is the usual SMP shutdown function,
+	 * which unfortunately may not be hardened to work in a panic
+	 * situation. If we want to do crash dump after notifier calls
+	 * and kmsg_dump, we will need architecture dependent extra
+	 * bits in addition to stopping other CPUs, hence we rely on
+	 * crash_smp_send_stop() for that.
+	 */
+	if (!crash_kexec)
+		smp_send_stop();
+	else
+		crash_smp_send_stop();
+}
+
 /**
  *	panic - halt the system
  *	@fmt: The text string to print
@@ -334,23 +355,10 @@ void panic(const char *fmt, ...)
 	 *
 	 * Bypass the panic_cpu check and call __crash_kexec directly.
 	 */
-	if (!_crash_kexec_post_notifiers) {
+	if (!_crash_kexec_post_notifiers)
 		__crash_kexec(NULL);
 
-		/*
-		 * Note smp_send_stop is the usual smp shutdown function, which
-		 * unfortunately means it may not be hardened to work in a
-		 * panic situation.
-		 */
-		smp_send_stop();
-	} else {
-		/*
-		 * If we want to do crash dump after notifier calls and
-		 * kmsg_dump, we will need architecture dependent extra
-		 * works in addition to stopping other CPUs.
-		 */
-		crash_smp_send_stop();
-	}
+	panic_other_cpus_shutdown(_crash_kexec_post_notifiers);
 
 	/*
 	 * Run any panic handlers, including those that might need to

lib/Kconfig.kasan

@@ -49,6 +49,15 @@ menuconfig KASAN
 
 if KASAN
 
+config CC_HAS_KASAN_MEMINTRINSIC_PREFIX
+	def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=kernel-address -mllvm -asan-kernel-mem-intrinsic-prefix=1)) || \
+		 (CC_IS_GCC && $(cc-option,-fsanitize=kernel-address --param asan-kernel-mem-intrinsic-prefix=1))
+	# Don't define it if we don't need it: compilation of the test uses
+	# this variable to decide how the compiler should treat builtins.
+	depends on !KASAN_HW_TAGS
+	help
+	  The compiler is able to prefix memintrinsics with __asan or __hwasan.
+
 choice
 	prompt "KASAN mode"
 	default KASAN_GENERIC

lib/parser.c

@@ -133,7 +133,7 @@ EXPORT_SYMBOL(match_token);
  * as a number in that base.
  *
  * Return: On success, sets @result to the integer represented by the
- * string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ * string and returns 0. Returns -EINVAL or -ERANGE on failure.
  */
 static int match_number(substring_t *s, int *result, int base)
 {
@@ -165,7 +165,7 @@ static int match_number(substring_t *s, int *result, int base)
  * as a number in that base.
  *
  * Return: On success, sets @result to the integer represented by the
- * string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ * string and returns 0. Returns -EINVAL or -ERANGE on failure.
  */
 static int match_u64int(substring_t *s, u64 *result, int base)
 {
@@ -189,7 +189,7 @@ static int match_u64int(substring_t *s, u64 *result, int base)
  * Description: Attempts to parse the &substring_t @s as a decimal integer.
  *
  * Return: On success, sets @result to the integer represented by the string
- * and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ * and returns 0. Returns -EINVAL or -ERANGE on failure.
  */
 int match_int(substring_t *s, int *result)
 {
@@ -205,7 +205,7 @@ EXPORT_SYMBOL(match_int);
  * Description: Attempts to parse the &substring_t @s as a decimal integer.
  *
  * Return: On success, sets @result to the integer represented by the string
- * and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ * and returns 0. Returns -EINVAL or -ERANGE on failure.
  */
 int match_uint(substring_t *s, unsigned int *result)
 {
@@ -228,7 +228,7 @@ EXPORT_SYMBOL(match_uint);
  * integer.
  *
  * Return: On success, sets @result to the integer represented by the string
- * and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ * and returns 0. Returns -EINVAL or -ERANGE on failure.
  */
 int match_u64(substring_t *s, u64 *result)
 {
@@ -244,7 +244,7 @@ EXPORT_SYMBOL(match_u64);
  * Description: Attempts to parse the &substring_t @s as an octal integer.
  *
  * Return: On success, sets @result to the integer represented by the string
- * and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ * and returns 0. Returns -EINVAL or -ERANGE on failure.
  */
 int match_octal(substring_t *s, int *result)
 {
@@ -260,7 +260,7 @@ EXPORT_SYMBOL(match_octal);
  * Description: Attempts to parse the &substring_t @s as a hexadecimal integer.
  *
  * Return: On success, sets @result to the integer represented by the string
- * and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ * and returns 0. Returns -EINVAL or -ERANGE on failure.
  */
 int match_hex(substring_t *s, int *result)
 {

lib/zlib_deflate/defutil.h

@@ -420,9 +420,11 @@ static inline void flush_pending(
 	z_streamp strm
 )
 {
+    unsigned len;
     deflate_state *s = (deflate_state *) strm->state;
-    unsigned len = s->pending;
 
+    bi_flush(s);
+    len = s->pending;
     if (len > strm->avail_out) len = strm->avail_out;
     if (len == 0) return;
 

mm/damon/paddr.c

@@ -250,12 +250,11 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s)
 			folio_put(folio);
 			continue;
 		}
-		if (folio_test_unevictable(folio)) {
+		if (folio_test_unevictable(folio))
 			folio_putback_lru(folio);
-		} else {
+		else
 			list_add(&folio->lru, &folio_list);
-			folio_put(folio);
-		}
+		folio_put(folio);
 	}
 	applied = reclaim_pages(&folio_list);
 	cond_resched();

mm/kasan/Makefile

@@ -35,7 +35,14 @@ CFLAGS_shadow.o := $(CC_FLAGS_KASAN_RUNTIME)
 CFLAGS_hw_tags.o := $(CC_FLAGS_KASAN_RUNTIME)
 CFLAGS_sw_tags.o := $(CC_FLAGS_KASAN_RUNTIME)
 
-CFLAGS_KASAN_TEST := $(CFLAGS_KASAN) -fno-builtin $(call cc-disable-warning, vla)
+CFLAGS_KASAN_TEST := $(CFLAGS_KASAN) $(call cc-disable-warning, vla)
+ifndef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
+# If compiler instruments memintrinsics by prefixing them with __asan/__hwasan,
+# we need to treat them normally (as builtins), otherwise the compiler won't
+# recognize them as instrumentable. If it doesn't instrument them, we need to
+# pass -fno-builtin, so the compiler doesn't inline them.
+CFLAGS_KASAN_TEST += -fno-builtin
+endif
 
 CFLAGS_kasan_test.o := $(CFLAGS_KASAN_TEST)
 CFLAGS_kasan_test_module.o := $(CFLAGS_KASAN_TEST)

mm/kasan/kasan.h

@@ -666,4 +666,8 @@ void __hwasan_storeN_noabort(unsigned long addr, size_t size);
 
 void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size);
 
+void *__hwasan_memset(void *addr, int c, size_t len);
+void *__hwasan_memmove(void *dest, const void *src, size_t len);
+void *__hwasan_memcpy(void *dest, const void *src, size_t len);
+
 #endif /* __MM_KASAN_KASAN_H */

mm/kasan/kasan_test.c

@@ -165,6 +165,15 @@ static void kasan_test_exit(struct kunit *test)
 		kunit_skip((test), "Test requires " #config "=n");	\
 } while (0)
 
+#define KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test) do {		\
+	if (IS_ENABLED(CONFIG_KASAN_HW_TAGS))				\
+		break;  /* No compiler instrumentation. */		\
+	if (IS_ENABLED(CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX))	\
+		break;  /* Should always be instrumented! */		\
+	if (IS_ENABLED(CONFIG_GENERIC_ENTRY))				\
+		kunit_skip((test), "Test requires checked mem*()");	\
+} while (0)
+
 static void kmalloc_oob_right(struct kunit *test)
 {
 	char *ptr;
@@ -454,6 +463,8 @@ static void kmalloc_oob_16(struct kunit *test)
 		u64 words[2];
 	} *ptr1, *ptr2;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	/* This test is specifically crafted for the generic mode. */
 	KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
 
@@ -476,6 +487,8 @@ static void kmalloc_uaf_16(struct kunit *test)
 		u64 words[2];
 	} *ptr1, *ptr2;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	ptr1 = kmalloc(sizeof(*ptr1), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
 
@@ -498,6 +511,8 @@ static void kmalloc_oob_memset_2(struct kunit *test)
 	char *ptr;
 	size_t size = 128 - KASAN_GRANULE_SIZE;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	ptr = kmalloc(size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
@@ -511,6 +526,8 @@ static void kmalloc_oob_memset_4(struct kunit *test)
 	char *ptr;
 	size_t size = 128 - KASAN_GRANULE_SIZE;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	ptr = kmalloc(size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
@@ -524,6 +541,8 @@ static void kmalloc_oob_memset_8(struct kunit *test)
 	char *ptr;
 	size_t size = 128 - KASAN_GRANULE_SIZE;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	ptr = kmalloc(size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
@@ -537,6 +556,8 @@ static void kmalloc_oob_memset_16(struct kunit *test)
 	char *ptr;
 	size_t size = 128 - KASAN_GRANULE_SIZE;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	ptr = kmalloc(size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
@@ -550,6 +571,8 @@ static void kmalloc_oob_in_memset(struct kunit *test)
 	char *ptr;
 	size_t size = 128 - KASAN_GRANULE_SIZE;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	ptr = kmalloc(size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
@@ -566,6 +589,8 @@ static void kmalloc_memmove_negative_size(struct kunit *test)
 	size_t size = 64;
 	size_t invalid_size = -2;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	/*
 	 * Hardware tag-based mode doesn't check memmove for negative size.
 	 * As a result, this test introduces a side-effect memory corruption,
@@ -590,6 +615,8 @@ static void kmalloc_memmove_invalid_size(struct kunit *test)
 	size_t size = 64;
 	size_t invalid_size = size;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	ptr = kmalloc(size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
@@ -618,6 +645,8 @@ static void kmalloc_uaf_memset(struct kunit *test)
 	char *ptr;
 	size_t size = 33;
 
+	KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
+
 	/*
 	 * Only generic KASAN uses quarantine, which is required to avoid a
 	 * kernel memory corruption this test causes.

mm/kasan/shadow.c

@@ -38,11 +38,14 @@ bool __kasan_check_write(const volatile void *p, unsigned int size)
 }
 EXPORT_SYMBOL(__kasan_check_write);
 
-#ifndef CONFIG_GENERIC_ENTRY
+#if !defined(CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX) && !defined(CONFIG_GENERIC_ENTRY)
 /*
  * CONFIG_GENERIC_ENTRY relies on compiler emitted mem*() calls to not be
  * instrumented. KASAN enabled toolchains should emit __asan_mem*() functions
  * for the sites they want to instrument.
+ *
+ * If we have a compiler that can instrument meminstrinsics, never override
+ * these, so that non-instrumented files can safely consider them as builtins.
  */
 #undef memset
 void *memset(void *addr, int c, size_t len)
@@ -107,6 +110,17 @@ void *__asan_memcpy(void *dest, const void *src, size_t len)
 }
 EXPORT_SYMBOL(__asan_memcpy);
 
+#ifdef CONFIG_KASAN_SW_TAGS
+void *__hwasan_memset(void *addr, int c, size_t len) __alias(__asan_memset);
+EXPORT_SYMBOL(__hwasan_memset);
+#ifdef __HAVE_ARCH_MEMMOVE
+void *__hwasan_memmove(void *dest, const void *src, size_t len) __alias(__asan_memmove);
+EXPORT_SYMBOL(__hwasan_memmove);
+#endif
+void *__hwasan_memcpy(void *dest, const void *src, size_t len) __alias(__asan_memcpy);
+EXPORT_SYMBOL(__hwasan_memcpy);
+#endif
+
 void kasan_poison(const void *addr, size_t size, u8 value, bool init)
 {
 	void *shadow_start, *shadow_end;

mm/memory-failure.c

@@ -1069,7 +1069,7 @@ static int me_pagecache_dirty(struct page_state *ps, struct page *p)
  * cache and swap cache(ie. page is freshly swapped in). So it could be
  * referenced concurrently by 2 types of PTEs:
  * normal PTEs and swap PTEs. We try to handle them consistently by calling
- * try_to_unmap(TTU_IGNORE_HWPOISON) to convert the normal PTEs to swap PTEs,
+ * try_to_unmap(!TTU_HWPOISON) to convert the normal PTEs to swap PTEs,
  * and then
  *      - clear dirty bit to prevent IO
  *      - remove from LRU
@@ -1486,7 +1486,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
 				  int flags, struct page *hpage)
 {
 	struct folio *folio = page_folio(hpage);
-	enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_SYNC;
+	enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_SYNC | TTU_HWPOISON;
 	struct address_space *mapping;
 	LIST_HEAD(tokill);
 	bool unmap_success;
@@ -1516,7 +1516,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
 
 	if (PageSwapCache(p)) {
 		pr_err("%#lx: keeping poisoned page in swap cache\n", pfn);
-		ttu |= TTU_IGNORE_HWPOISON;
+		ttu &= ~TTU_HWPOISON;
 	}
 
 	/*
@@ -1531,7 +1531,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
 		if (page_mkclean(hpage)) {
 			SetPageDirty(hpage);
 		} else {
-			ttu |= TTU_IGNORE_HWPOISON;
+			ttu &= ~TTU_HWPOISON;
 			pr_info("%#lx: corrupted page was clean: dropped without side effects\n",
 				pfn);
 		}

mm/mmap.c

@@ -973,7 +973,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 			vma_end = addr;
 			adjust = mid;
 			adj_next = -(vma->vm_end - addr);
-			err = dup_anon_vma(res, adjust);
+			err = dup_anon_vma(adjust, prev);
 		} else {
 			vma = next;			/* case 3 */
 			vma_start = addr;

mm/rmap.c

@@ -1602,7 +1602,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
 		/* Update high watermark before we lower rss */
 		update_hiwater_rss(mm);
 
-		if (PageHWPoison(subpage) && !(flags & TTU_IGNORE_HWPOISON)) {
+		if (PageHWPoison(subpage) && (flags & TTU_HWPOISON)) {
 			pteval = swp_entry_to_pte(make_hwpoison_entry(subpage));
 			if (folio_test_hugetlb(folio)) {
 				hugetlb_count_sub(folio_nr_pages(folio), mm);

scripts/Makefile.kasan

 # SPDX-License-Identifier: GPL-2.0
+
+ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
+# Safe for compiler to generate meminstrinsic calls in uninstrumented files.
+CFLAGS_KASAN_NOSANITIZE :=
+else
+# Don't let compiler generate memintrinsic calls in uninstrumented files
+# because they are instrumented.
 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
+endif
+
 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
 
 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
@@ -38,6 +47,11 @@ endif
 
 CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
 
+# Instrument memcpy/memset/memmove calls by using instrumented __asan_mem*()
+# instead. With compilers that don't support this option, compiler-inserted
+# memintrinsics won't be checked by KASAN on GENERIC_ENTRY architectures.
+CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1)
+
 endif # CONFIG_KASAN_GENERIC
 
 ifdef CONFIG_KASAN_SW_TAGS
@@ -54,6 +68,9 @@ CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
 		$(call cc-param,hwasan-inline-all-checks=0) \
 		$(instrumentation_flags)
 
+# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
+CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1)
+
 endif # CONFIG_KASAN_SW_TAGS
 
 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE