linux-kernel - [PATCH v2 5/5] dnotify: Pass argument of fcntl

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Date:   Fri, 14 Apr 2023 16:24:59 +0100
From:   Luca Vizzarro <Luca.Vizzarro@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Luca Vizzarro <Luca.Vizzarro@....com>, Jan Kara <jack@...e.cz>,
        Amir Goldstein <amir73il@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Jeff Layton <jlayton@...nel.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Kevin Brodsky <Kevin.Brodsky@....com>,
        Vincenzo Frascino <Vincenzo.Frascino@....com>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>,
        "Theodore Ts'o" <tytso@....edu>,
        David Laight <David.Laight@...LAB.com>,
        Mark Rutland <Mark.Rutland@....com>,
        linux-fsdevel@...r.kernel.org, linux-morello@...lists.linaro.org
Subject: [PATCH v2 5/5] dnotify: Pass argument of fcntl_dirnotify as int

The interface for fcntl expects the argument passed for the command
F_DIRNOTIFY to be of type int. The current code wrongly treats it as
a long. In order to avoid access to undefined bits, we should explicitly
cast the argument to int.

Cc: Jan Kara <jack@...e.cz>
Cc: Amir Goldstein <amir73il@...il.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Jeff Layton <jlayton@...nel.org>
Cc: Chuck Lever <chuck.lever@...cle.com>
Cc: Kevin Brodsky <Kevin.Brodsky@....com>
Cc: Vincenzo Frascino <Vincenzo.Frascino@....com>
Cc: Szabolcs Nagy <Szabolcs.Nagy@....com>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: David Laight <David.Laight@...LAB.com>
Cc: Mark Rutland <Mark.Rutland@....com>
Cc: linux-fsdevel@...r.kernel.org
Cc: linux-morello@...lists.linaro.org
Acked-by: Jan Kara <jack@...e.cz>
Signed-off-by: Luca Vizzarro <Luca.Vizzarro@....com>
---
 fs/notify/dnotify/dnotify.c | 4 ++--
 include/linux/dnotify.h     | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 190aa717fa32..ebdcc25df0f7 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -199,7 +199,7 @@ void dnotify_flush(struct file *filp, fl_owner_t id)
 }
 
 /* this conversion is done only at watch creation */
-static __u32 convert_arg(unsigned long arg)
+static __u32 convert_arg(unsigned int arg)
 {
 	__u32 new_mask = FS_EVENT_ON_CHILD;
 
@@ -258,7 +258,7 @@ static int attach_dn(struct dnotify_struct *dn, struct dnotify_mark *dn_mark,
  * up here.  Allocate both a mark for fsnotify to add and a dnotify_struct to be
  * attached to the fsnotify_mark.
  */
-int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
+int fcntl_dirnotify(int fd, struct file *filp, unsigned int arg)
 {
 	struct dnotify_mark *new_dn_mark, *dn_mark;
 	struct fsnotify_mark *new_fsn_mark, *fsn_mark;
diff --git a/include/linux/dnotify.h b/include/linux/dnotify.h
index b1d26f9f1c9f..9f183a679277 100644
--- a/include/linux/dnotify.h
+++ b/include/linux/dnotify.h
@@ -30,7 +30,7 @@ struct dnotify_struct {
 			    FS_MOVED_FROM | FS_MOVED_TO)
 
 extern void dnotify_flush(struct file *, fl_owner_t);
-extern int fcntl_dirnotify(int, struct file *, unsigned long);
+extern int fcntl_dirnotify(int, struct file *, unsigned int);
 
 #else
 
@@ -38,7 +38,7 @@ static inline void dnotify_flush(struct file *filp, fl_owner_t id)
 {
 }
 
-static inline int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
+static inline int fcntl_dirnotify(int fd, struct file *filp, unsigned int arg)
 {
 	return -EINVAL;
 }
-- 
2.34.1