0.3.4

This release fixes the build for the Linux 6.5 release candidate, and it
should also fix a long-standing mmap bug in Linux 5.14 and above, which
resulted in null pointer dereference.

Signed-off-by: Ernesto A. Fernández <ernesto@corellium.com>

compress.c

@@ -36,8 +36,11 @@ static inline void *kvmalloc(size_t size, gfp_t flags)
 
 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0) */
 
-/* maximum size of compressed data currently supported */
-#define MAX_FBUF_SIZE		(128 * 1024 * 1024)
+/*
+ * Maximum size of compressed data currently supported. This is getting too
+ * big already. TODO: avoid vmalloc().
+ */
+#define MAX_FBUF_SIZE		(256 * 1024 * 1024)
 
 struct apfs_compress_file_data {
 	struct apfs_compress_hdr hdr;

dir.c

@@ -268,7 +268,7 @@ static int apfs_build_dentry_unhashed_key(struct qstr *qname, u64 parent_id,
 
 	apfs_key_set_hdr(APFS_TYPE_DIR_REC, parent_id, key);
 	key->name_len = cpu_to_le16(namelen);
-	strcpy(key->name, qname->name);
+	strscpy(key->name, qname->name, namelen);
 
 	*key_p = key;
 	return key_len;
@@ -297,7 +297,7 @@ static int apfs_build_dentry_hashed_key(struct qstr *qname, u64 hash, u64 parent
 
 	apfs_key_set_hdr(APFS_TYPE_DIR_REC, parent_id, key);
 	key->name_len_and_hash = cpu_to_le32(namelen | hash);
-	strcpy(key->name, qname->name);
+	strscpy(key->name, qname->name, namelen);
 
 	*key_p = key;
 	return key_len;
@@ -434,7 +434,7 @@ static int apfs_build_sibling_val(struct dentry *dentry,
 
 	val->parent_id = cpu_to_le64(apfs_ino(parent));
 	val->name_len = cpu_to_le16(namelen);
-	strcpy(val->name, qname->name);
+	strscpy(val->name, qname->name, namelen);
 
 	*val_p = val;
 	return val_len;
@@ -1089,7 +1089,7 @@ static int apfs_sibling_link_from_query(struct apfs_query *query,
 	*name = kmalloc(namelen, GFP_KERNEL);
 	if (!*name)
 		return -ENOMEM;
-	strcpy(*name, siblink->name);
+	strscpy(*name, siblink->name, namelen);
 	*parent = le64_to_cpu(siblink->parent_id);
 	return 0;
 }

dkms.conf

@@ -1,5 +1,5 @@
 PACKAGE_NAME="linux-apfs-rw"
-PACKAGE_VERSION="0.3.3"
+PACKAGE_VERSION="0.3.4"
 
 BUILT_MODULE_NAME[0]="apfs"
 DEST_MODULE_LOCATION[0]="/extra"

inode.c

@@ -679,6 +679,12 @@ static void apfs_noop_invalidate_folio(struct folio *folio, size_t offset, size_
 
 /* bmap is not implemented to avoid issues with CoW on swapfiles */
 static const struct address_space_operations apfs_aops = {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 18, 0)
+	.dirty_folio	= block_dirty_folio,
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0)
+	.set_page_dirty	= __set_page_dirty_buffers,
+#endif
+
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 19, 0)
 	.read_folio	= apfs_read_folio,
 #else

snapshot.c

@@ -116,7 +116,7 @@ static int apfs_create_snap_metadata_rec(struct inode *mntpoint, struct apfs_nod
 	raw_val->extentref_tree_type = vsb_raw->apfs_extentref_tree_type;
 	raw_val->flags = 0;
 	raw_val->name_len = cpu_to_le16(name_len + 1); /* Count the null byte */
-	strcpy(raw_val->name, name);
+	strscpy(raw_val->name, name, name_len + 1);
 
 	apfs_assert_in_transaction(sb, &vsb_raw->apfs_o);
 	raw_val->inum = vsb_raw->apfs_next_obj_id;
@@ -173,7 +173,7 @@ static int apfs_create_snap_name_rec(struct apfs_node *snap_root, const char *na
 	}
 	apfs_key_set_hdr(APFS_TYPE_SNAP_NAME, APFS_SNAP_NAME_OBJ_ID, raw_key);
 	raw_key->name_len = cpu_to_le16(name_len + 1); /* Count the null byte */
-	strcpy(raw_key->name, name);
+	strscpy(raw_key->name, name, name_len + 1);
 
 	raw_val.snap_xid = cpu_to_le64(APFS_NXI(sb)->nx_xid);
 

super.c

@@ -272,11 +272,13 @@ static void apfs_update_software_info(struct super_block *sb)
 	memmove(mod_by + 1, mod_by, (APFS_MAX_HIST - 1) * sizeof(*mod_by));
 
 	memset(mod_by->id, 0, sizeof(mod_by->id));
-	strcpy(mod_by->id, APFS_MODULE_ID_STRING);
+	strscpy(mod_by->id, APFS_MODULE_ID_STRING, sizeof(mod_by->id));
 	mod_by->timestamp = cpu_to_le64(ktime_get_real_ns());
 	mod_by->last_xid = cpu_to_le64(APFS_NXI(sb)->nx_xid);
 }
 
+static struct file_system_type apfs_fs_type;
+
 /**
  * apfs_unmap_main_super - Clean up apfs_map_main_super()
  * @sbi:	in-memory superblock info
@@ -286,11 +288,15 @@ static void apfs_update_software_info(struct super_block *sb)
 static inline void apfs_unmap_main_super(struct apfs_sb_info *sbi)
 {
 	struct apfs_nxsb_info *nxi = sbi->s_nxi;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0)
 	fmode_t mode = FMODE_READ | FMODE_EXCL;
+#endif
 	struct apfs_object *obj = NULL;
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0)
 	if (nxi->nx_flags & APFS_READWRITE)
 		mode |= FMODE_WRITE;
+#endif
 
 	lockdep_assert_held(&nxs_mutex);
 
@@ -304,7 +310,12 @@ static inline void apfs_unmap_main_super(struct apfs_sb_info *sbi)
 	obj->o_bh = NULL;
 	obj = NULL;
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0)
+	blkdev_put(nxi->nx_bdev, &apfs_fs_type);
+#else
 	blkdev_put(nxi->nx_bdev, mode);
+#endif
+
 	list_del(&nxi->nx_list);
 	kfree(nxi);
 out:
@@ -1450,8 +1461,6 @@ static int apfs_set_super(struct super_block *sb, void *data)
 	return err;
 }
 
-static struct file_system_type apfs_fs_type;
-
 /*
  * Wrapper for lookup_bdev() that supports older kernels.
  */
@@ -1480,7 +1489,11 @@ static int apfs_lookup_bdev(const char *pathname, dev_t *dev)
  *
  * Returns 0 on success, or a negative error code in case of failure.
  */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0)
+static int apfs_attach_nxi(struct apfs_sb_info *sbi, const char *dev_name, blk_mode_t mode)
+#else
 static int apfs_attach_nxi(struct apfs_sb_info *sbi, const char *dev_name, fmode_t mode)
+#endif
 {
 	struct apfs_nxsb_info *nxi;
 	dev_t dev = 0;
@@ -1500,7 +1513,11 @@ static int apfs_attach_nxi(struct apfs_sb_info *sbi, const char *dev_name, fmode
 		if (!nxi)
 			return -ENOMEM;
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0)
+		bdev = blkdev_get_by_path(dev_name, mode, &apfs_fs_type, NULL);
+#else
 		bdev = blkdev_get_by_path(dev_name, mode, &apfs_fs_type);
+#endif
 		if (IS_ERR(bdev)) {
 			kfree(nxi);
 			return PTR_ERR(bdev);
@@ -1527,7 +1544,11 @@ static struct dentry *apfs_mount(struct file_system_type *fs_type, int flags,
 	struct apfs_nxsb_info *nxi;
 	struct super_block *sb;
 	struct apfs_sb_info *sbi;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0)
+	blk_mode_t mode = sb_open_mode(flags);
+#else
 	fmode_t mode = FMODE_READ | FMODE_EXCL;
+#endif
 	int error = 0;
 
 	mutex_lock(&nxs_mutex);
@@ -1544,8 +1565,10 @@ static struct dentry *apfs_mount(struct file_system_type *fs_type, int flags,
 	if (sbi->s_snap_name)
 		flags |= SB_RDONLY;
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0)
 	if (!(flags & SB_RDONLY))
 		mode |= FMODE_WRITE;
+#endif
 
 	error = apfs_attach_nxi(sbi, dev_name, mode);
 	if (error)
@@ -1572,7 +1595,9 @@ static struct dentry *apfs_mount(struct file_system_type *fs_type, int flags,
 		error = apfs_map_main_super(sb);
 		if (error)
 			goto out_deactivate_super;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0)
 		sb->s_mode = mode;
+#endif
 		snprintf(sb->s_id, sizeof(sb->s_id), "%xg", sb->s_dev);
 		error = apfs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
 		if (error)

xattr.c

@@ -465,7 +465,7 @@ static int apfs_build_xattr_key(const char *name, u64 ino, struct apfs_xattr_key
 
 	apfs_key_set_hdr(APFS_TYPE_XATTR, ino, key);
 	key->name_len = cpu_to_le16(namelen);
-	strcpy(key->name, name);
+	strscpy(key->name, name, namelen);
 
 	*key_p = key;
 	return key_len;