Merge tag 'vfs-6.17-rc3.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs fixes from Christian Brauner:

 - Fix two memory leaks in pidfs

 - Prevent changing the idmapping of an already idmapped mount without
   OPEN_TREE_CLONE through open_tree_attr()

 - Don't fail listing extended attributes in kernfs when no extended
   attributes are set

 - Fix the return value in coredump_parse()

 - Fix the error handling for unbuffered writes in netfs

 - Fix broken data integrity guarantees for O_SYNC writes via iomap

 - Fix UAF in __mark_inode_dirty()

 - Keep inode->i_blkbits constant in fuse

 - Fix coredump selftests

 - Fix get_unused_fd_flags() usage in do_handle_open()

 - Rename EXPORT_SYMBOL_GPL_FOR_MODULES to EXPORT_SYMBOL_FOR_MODULES

 - Fix use-after-free in bh_read()

 - Fix incorrect lflags value in the move_mount() syscall

* tag 'vfs-6.17-rc3.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  signal: Fix memory leak for PIDFD_SELF* sentinels
  kernfs: don't fail listing extended attributes
  coredump: Fix return value in coredump_parse()
  fs/buffer: fix use-after-free when call bh_read() helper
  pidfs: Fix memory leak in pidfd_info()
  netfs: Fix unbuffered write error handling
  fhandle: do_handle_open() should get FD with user flags
  module: Rename EXPORT_SYMBOL_GPL_FOR_MODULES to EXPORT_SYMBOL_FOR_MODULES
  fs: fix incorrect lflags value in the move_mount syscall
  selftests/coredump: Remove the read() that fails the test
  fuse: keep inode->i_blkbits constant
  iomap: Fix broken data integrity guarantees for O_SYNC writes
  selftests/mount_setattr: add smoke tests for open_tree_attr(2) bug
  open_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE
  fs: writeback: fix use-after-free in __mark_inode_dirty()

fs/anon_inodes.c

@@ -129,7 +129,7 @@ struct inode *anon_inode_make_secure_inode(struct super_block *sb, const char *n
 	}
 	return inode;
 }
-EXPORT_SYMBOL_GPL_FOR_MODULES(anon_inode_make_secure_inode, "kvm");
+EXPORT_SYMBOL_FOR_MODULES(anon_inode_make_secure_inode, "kvm");
 
 static struct file *__anon_inode_getfile(const char *name,
 					 const struct file_operations *fops,

fs/buffer.c

@@ -157,8 +157,8 @@ static void __end_buffer_read_notouch(struct buffer_head *bh, int uptodate)
  */
 void end_buffer_read_sync(struct buffer_head *bh, int uptodate)
 {
-	__end_buffer_read_notouch(bh, uptodate);
 	put_bh(bh);
+	__end_buffer_read_notouch(bh, uptodate);
 }
 EXPORT_SYMBOL(end_buffer_read_sync);
 

fs/coredump.c

@@ -345,7 +345,7 @@ static bool coredump_parse(struct core_name *cn, struct coredump_params *cprm,
 				was_space = false;
 				err = cn_printf(cn, "%c", '\0');
 				if (err)
-					return err;
+					return false;
 				(*argv)[(*argc)++] = cn->used;
 			}
 		}

fs/fhandle.c

@@ -402,7 +402,7 @@ static long do_handle_open(int mountdirfd, struct file_handle __user *ufh,
 	if (retval)
 		return retval;
 
-	CLASS(get_unused_fd, fd)(O_CLOEXEC);
+	CLASS(get_unused_fd, fd)(open_flag);
 	if (fd < 0)
 		return fd;
 

fs/fs-writeback.c

@@ -2608,10 +2608,6 @@ void __mark_inode_dirty(struct inode *inode, int flags)
 			wakeup_bdi = inode_io_list_move_locked(inode, wb,
 							       dirty_list);
 
-			spin_unlock(&wb->list_lock);
-			spin_unlock(&inode->i_lock);
-			trace_writeback_dirty_inode_enqueue(inode);
-
 			/*
 			 * If this is the first dirty inode for this bdi,
 			 * we have to wake-up the corresponding bdi thread
@@ -2621,6 +2617,11 @@ void __mark_inode_dirty(struct inode *inode, int flags)
 			if (wakeup_bdi &&
 			    (wb->bdi->capabilities & BDI_CAP_WRITEBACK))
 				wb_wakeup_delayed(wb);
+
+			spin_unlock(&wb->list_lock);
+			spin_unlock(&inode->i_lock);
+			trace_writeback_dirty_inode_enqueue(inode);
+
 			return;
 		}
 	}

fs/fuse/inode.c

@@ -289,11 +289,6 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
 		}
 	}
 
-	if (attr->blksize != 0)
-		inode->i_blkbits = ilog2(attr->blksize);
-	else
-		inode->i_blkbits = inode->i_sb->s_blocksize_bits;
-
 	/*
 	 * Don't set the sticky bit in i_mode, unless we want the VFS
 	 * to check permissions.  This prevents failures due to the

fs/iomap/direct-io.c

@@ -363,14 +363,14 @@ static int iomap_dio_bio_iter(struct iomap_iter *iter, struct iomap_dio *dio)
 		if (iomap->flags & IOMAP_F_SHARED)
 			dio->flags |= IOMAP_DIO_COW;
 
-		if (iomap->flags & IOMAP_F_NEW) {
+		if (iomap->flags & IOMAP_F_NEW)
 			need_zeroout = true;
-		} else if (iomap->type == IOMAP_MAPPED) {
-			if (iomap_dio_can_use_fua(iomap, dio))
-				bio_opf |= REQ_FUA;
-			else
-				dio->flags &= ~IOMAP_DIO_WRITE_THROUGH;
-		}
+		else if (iomap->type == IOMAP_MAPPED &&
+			 iomap_dio_can_use_fua(iomap, dio))
+			bio_opf |= REQ_FUA;
+
+		if (!(bio_opf & REQ_FUA))
+			dio->flags &= ~IOMAP_DIO_WRITE_THROUGH;
 
 		/*
 		 * We can only do deferred completion for pure overwrites that

fs/kernfs/inode.c

@@ -142,9 +142,9 @@ ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size)
 	struct kernfs_node *kn = kernfs_dentry_node(dentry);
 	struct kernfs_iattrs *attrs;
 
-	attrs = kernfs_iattrs_noalloc(kn);
+	attrs = kernfs_iattrs(kn);
 	if (!attrs)
-		return -ENODATA;
+		return -ENOMEM;
 
 	return simple_xattr_list(d_inode(dentry), &attrs->xattrs, buf, size);
 }

fs/namespace.c

@@ -4551,20 +4551,10 @@ SYSCALL_DEFINE5(move_mount,
 	if (flags & MOVE_MOUNT_SET_GROUP)	mflags |= MNT_TREE_PROPAGATION;
 	if (flags & MOVE_MOUNT_BENEATH)		mflags |= MNT_TREE_BENEATH;
 
-	lflags = 0;
-	if (flags & MOVE_MOUNT_F_SYMLINKS)	lflags |= LOOKUP_FOLLOW;
-	if (flags & MOVE_MOUNT_F_AUTOMOUNTS)	lflags |= LOOKUP_AUTOMOUNT;
 	uflags = 0;
-	if (flags & MOVE_MOUNT_F_EMPTY_PATH)	uflags = AT_EMPTY_PATH;
-	from_name = getname_maybe_null(from_pathname, uflags);
-	if (IS_ERR(from_name))
-		return PTR_ERR(from_name);
+	if (flags & MOVE_MOUNT_T_EMPTY_PATH)
+		uflags = AT_EMPTY_PATH;
 
-	lflags = 0;
-	if (flags & MOVE_MOUNT_T_SYMLINKS)	lflags |= LOOKUP_FOLLOW;
-	if (flags & MOVE_MOUNT_T_AUTOMOUNTS)	lflags |= LOOKUP_AUTOMOUNT;
-	uflags = 0;
-	if (flags & MOVE_MOUNT_T_EMPTY_PATH)	uflags = AT_EMPTY_PATH;
 	to_name = getname_maybe_null(to_pathname, uflags);
 	if (IS_ERR(to_name))
 		return PTR_ERR(to_name);
@@ -4577,11 +4567,24 @@ SYSCALL_DEFINE5(move_mount,
 		to_path = fd_file(f_to)->f_path;
 		path_get(&to_path);
 	} else {
+		lflags = 0;
+		if (flags & MOVE_MOUNT_T_SYMLINKS)
+			lflags |= LOOKUP_FOLLOW;
+		if (flags & MOVE_MOUNT_T_AUTOMOUNTS)
+			lflags |= LOOKUP_AUTOMOUNT;
 		ret = filename_lookup(to_dfd, to_name, lflags, &to_path, NULL);
 		if (ret)
 			return ret;
 	}
 
+	uflags = 0;
+	if (flags & MOVE_MOUNT_F_EMPTY_PATH)
+		uflags = AT_EMPTY_PATH;
+
+	from_name = getname_maybe_null(from_pathname, uflags);
+	if (IS_ERR(from_name))
+		return PTR_ERR(from_name);
+
 	if (!from_name && from_dfd >= 0) {
 		CLASS(fd_raw, f_from)(from_dfd);
 		if (fd_empty(f_from))
@@ -4590,6 +4593,11 @@ SYSCALL_DEFINE5(move_mount,
 		return vfs_move_mount(&fd_file(f_from)->f_path, &to_path, mflags);
 	}
 
+	lflags = 0;
+	if (flags & MOVE_MOUNT_F_SYMLINKS)
+		lflags |= LOOKUP_FOLLOW;
+	if (flags & MOVE_MOUNT_F_AUTOMOUNTS)
+		lflags |= LOOKUP_AUTOMOUNT;
 	ret = filename_lookup(from_dfd, from_name, lflags, &from_path, NULL);
 	if (ret)
 		return ret;
@@ -5176,7 +5184,8 @@ SYSCALL_DEFINE5(open_tree_attr, int, dfd, const char __user *, filename,
 		int ret;
 		struct mount_kattr kattr = {};
 
-		kattr.kflags = MOUNT_KATTR_IDMAP_REPLACE;
+		if (flags & OPEN_TREE_CLONE)
+			kattr.kflags = MOUNT_KATTR_IDMAP_REPLACE;
 		if (flags & AT_RECURSIVE)
 			kattr.kflags |= MOUNT_KATTR_RECURSE;
 

fs/netfs/read_collect.c

@@ -281,8 +281,10 @@ reassess:
 		} else if (test_bit(NETFS_RREQ_SHORT_TRANSFER, &rreq->flags)) {
 			notes |= MADE_PROGRESS;
 		} else {
-			if (!stream->failed)
+			if (!stream->failed) {
 				stream->transferred += transferred;
+				stream->transferred_valid = true;
+			}
 			if (front->transferred < front->len)
 				set_bit(NETFS_RREQ_SHORT_TRANSFER, &rreq->flags);
 			notes |= MADE_PROGRESS;

fs/netfs/write_collect.c

@@ -254,6 +254,7 @@ reassess_streams:
 			if (front->start + front->transferred > stream->collected_to) {
 				stream->collected_to = front->start + front->transferred;
 				stream->transferred = stream->collected_to - wreq->start;
+				stream->transferred_valid = true;
 				notes |= MADE_PROGRESS;
 			}
 			if (test_bit(NETFS_SREQ_FAILED, &front->flags)) {
@@ -356,6 +357,7 @@ bool netfs_write_collection(struct netfs_io_request *wreq)
 {
 	struct netfs_inode *ictx = netfs_inode(wreq->inode);
 	size_t transferred;
+	bool transferred_valid = false;
 	int s;
 
 	_enter("R=%x", wreq->debug_id);
@@ -376,12 +378,16 @@ bool netfs_write_collection(struct netfs_io_request *wreq)
 			continue;
 		if (!list_empty(&stream->subrequests))
 			return false;
-		if (stream->transferred < transferred)
+		if (stream->transferred_valid &&
+		    stream->transferred < transferred) {
 			transferred = stream->transferred;
+			transferred_valid = true;
+		}
 	}
 
 	/* Okay, declare that all I/O is complete. */
-	wreq->transferred = transferred;
+	if (transferred_valid)
+		wreq->transferred = transferred;
 	trace_netfs_rreq(wreq, netfs_rreq_trace_write_done);
 
 	if (wreq->io_streams[1].active &&

fs/netfs/write_issue.c

@@ -118,12 +118,12 @@ struct netfs_io_request *netfs_create_write_req(struct address_space *mapping,
 	wreq->io_streams[0].prepare_write	= ictx->ops->prepare_write;
 	wreq->io_streams[0].issue_write		= ictx->ops->issue_write;
 	wreq->io_streams[0].collected_to	= start;
-	wreq->io_streams[0].transferred		= LONG_MAX;
+	wreq->io_streams[0].transferred		= 0;
 
 	wreq->io_streams[1].stream_nr		= 1;
 	wreq->io_streams[1].source		= NETFS_WRITE_TO_CACHE;
 	wreq->io_streams[1].collected_to	= start;
-	wreq->io_streams[1].transferred		= LONG_MAX;
+	wreq->io_streams[1].transferred		= 0;
 	if (fscache_resources_valid(&wreq->cache_resources)) {
 		wreq->io_streams[1].avail	= true;
 		wreq->io_streams[1].active	= true;

fs/pidfs.c

@@ -296,12 +296,12 @@ static __u32 pidfs_coredump_mask(unsigned long mm_flags)
 static long pidfd_info(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct pidfd_info __user *uinfo = (struct pidfd_info __user *)arg;
+	struct task_struct *task __free(put_task) = NULL;
 	struct pid *pid = pidfd_pid(file);
 	size_t usize = _IOC_SIZE(cmd);
 	struct pidfd_info kinfo = {};
 	struct pidfs_exit_info *exit_info;
 	struct user_namespace *user_ns;
-	struct task_struct *task;
 	struct pidfs_attr *attr;
 	const struct cred *c;
 	__u64 mask;

fs/splice.c

@@ -739,6 +739,9 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
 		sd.pos = kiocb.ki_pos;
 		if (ret <= 0)
 			break;
+		WARN_ONCE(ret > sd.total_len - left,
+			  "Splice Exceeded! ret=%zd tot=%zu left=%zu\n",
+			  ret, sd.total_len, left);
 
 		sd.num_spliced += ret;
 		sd.total_len -= ret;