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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/fs/notify/inotify/inotify_fsnotify.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * fs/inotify_user.c - inotify support for userspace
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  *
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@@ -10,16 +11,6 @@
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  *
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  * Copyright (C) 2009 Eric Paris <Red Hat Inc>
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  * inotify was largely rewriten to make use of the fsnotify infrastructure
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License as published by the
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- * Free Software Foundation; either version 2, or (at your option) any
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- * later version.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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  */
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15
 
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 #include <linux/dcache.h> /* d_unlinked */
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@@ -43,12 +34,12 @@
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 {
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 	struct inotify_event_info *old, *new;
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-	if (old_fsn->mask & FS_IN_IGNORED)
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-		return false;
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 	old = INOTIFY_E(old_fsn);
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 	new = INOTIFY_E(new_fsn);
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-	if ((old_fsn->mask == new_fsn->mask) &&
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-	    (old_fsn->inode == new_fsn->inode) &&
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+	if (old->mask & FS_IN_IGNORED)
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+		return false;
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+	if ((old->mask == new->mask) &&
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+	    (old->wd == new->wd) &&
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 	    (old->name_len == new->name_len) &&
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 	    (!old->name_len || !strcmp(old->name, new->name)))
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 		return true;
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@@ -64,49 +55,45 @@
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 	return event_compare(last_event, event);
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 }
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-int inotify_handle_event(struct fsnotify_group *group,
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-			 struct inode *inode,
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-			 u32 mask, const void *data, int data_type,
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-			 const unsigned char *file_name, u32 cookie,
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-			 struct fsnotify_iter_info *iter_info)
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+int inotify_handle_inode_event(struct fsnotify_mark *inode_mark, u32 mask,
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+			       struct inode *inode, struct inode *dir,
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+			       const struct qstr *name, u32 cookie)
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 {
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-	struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
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 	struct inotify_inode_mark *i_mark;
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 	struct inotify_event_info *event;
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 	struct fsnotify_event *fsn_event;
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+	struct fsnotify_group *group = inode_mark->group;
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 	int ret;
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-	int len = 0;
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+	int len = 0, wd;
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 	int alloc_len = sizeof(struct inotify_event_info);
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+	struct mem_cgroup *old_memcg;
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-	if (WARN_ON(fsnotify_iter_vfsmount_mark(iter_info)))
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-		return 0;
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-
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-	if ((inode_mark->mask & FS_EXCL_UNLINK) &&
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-	    (data_type == FSNOTIFY_EVENT_PATH)) {
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-		const struct path *path = data;
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-
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-		if (d_unlinked(path->dentry))
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-			return 0;
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-	}
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-	if (file_name) {
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-		len = strlen(file_name);
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+	if (name) {
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+		len = name->len;
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 		alloc_len += len + 1;
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 	}
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-	pr_debug("%s: group=%p inode=%p mask=%x\n", __func__, group, inode,
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+	pr_debug("%s: group=%p mark=%p mask=%x\n", __func__, group, inode_mark,
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 		 mask);
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 	i_mark = container_of(inode_mark, struct inotify_inode_mark,
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 			      fsn_mark);
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 	/*
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+	 * We can be racing with mark being detached. Don't report event with
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+	 * invalid wd.
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+	 */
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+	wd = READ_ONCE(i_mark->wd);
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+	if (wd == -1)
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+		return 0;
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+	/*
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 	 * Whoever is interested in the event, pays for the allocation. Do not
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 	 * trigger OOM killer in the target monitoring memcg as it may have
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 	 * security repercussion.
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 	 */
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-	memalloc_use_memcg(group->memcg);
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+	old_memcg = set_active_memcg(group->memcg);
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 	event = kmalloc(alloc_len, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL);
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-	memalloc_unuse_memcg();
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+	set_active_memcg(old_memcg);
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 	if (unlikely(!event)) {
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 		/*
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@@ -117,13 +104,23 @@
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 		return -ENOMEM;
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 	}
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+	/*
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+	 * We now report FS_ISDIR flag with MOVE_SELF and DELETE_SELF events
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+	 * for fanotify. inotify never reported IN_ISDIR with those events.
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+	 * It looks like an oversight, but to avoid the risk of breaking
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+	 * existing inotify programs, mask the flag out from those events.
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+	 */
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+	if (mask & (IN_MOVE_SELF | IN_DELETE_SELF))
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+		mask &= ~IN_ISDIR;
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+
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 	fsn_event = &event->fse;
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-	fsnotify_init_event(fsn_event, inode, mask);
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-	event->wd = i_mark->wd;
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+	fsnotify_init_event(fsn_event, 0);
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+	event->mask = mask;
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+	event->wd = wd;
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 	event->sync_cookie = cookie;
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 	event->name_len = len;
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 	if (len)
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-		strcpy(event->name, file_name);
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+		strcpy(event->name, name->name);
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 	ret = fsnotify_add_event(group, fsn_event, inotify_merge);
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 	if (ret) {
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@@ -202,7 +199,7 @@
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 }
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 const struct fsnotify_ops inotify_fsnotify_ops = {
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-	.handle_event = inotify_handle_event,
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+	.handle_inode_event = inotify_handle_inode_event,
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 	.free_group_priv = inotify_free_group_priv,
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 	.free_event = inotify_free_event,
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 	.freeing_mark = inotify_freeing_mark,