This is a note to let you know that I've just added the patch titled
fanotify: support secondary dir fh and name in fanotify_info
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fanotify-support-secondary-dir-fh-and-name-in-fanoti.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bfa4c11a10f11994313f27ae33240a4c61805462
Author: Amir Goldstein <amir73il@xxxxxxxxx>
Date: Mon Nov 29 22:15:33 2021 +0200
fanotify: support secondary dir fh and name in fanotify_info
[ Upstream commit 3cf984e950c1c3f41d407ed31db33beb996be132 ]
Allow storing a secondary dir fh and name tupple in fanotify_info.
This will be used to store the new parent and name information in
FAN_RENAME event.
Link: https://lore.kernel.org/r/20211129201537.1932819-8-amir73il@xxxxxxxxx
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 2b13c79cebc62..5f184b2d6ea7c 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -76,8 +76,10 @@ static bool fanotify_info_equal(struct fanotify_info *info1,
struct fanotify_info *info2)
{
if (info1->dir_fh_totlen != info2->dir_fh_totlen ||
+ info1->dir2_fh_totlen != info2->dir2_fh_totlen ||
info1->file_fh_totlen != info2->file_fh_totlen ||
- info1->name_len != info2->name_len)
+ info1->name_len != info2->name_len ||
+ info1->name2_len != info2->name2_len)
return false;
if (info1->dir_fh_totlen &&
@@ -85,14 +87,24 @@ static bool fanotify_info_equal(struct fanotify_info *info1,
fanotify_info_dir_fh(info2)))
return false;
+ if (info1->dir2_fh_totlen &&
+ !fanotify_fh_equal(fanotify_info_dir2_fh(info1),
+ fanotify_info_dir2_fh(info2)))
+ return false;
+
if (info1->file_fh_totlen &&
!fanotify_fh_equal(fanotify_info_file_fh(info1),
fanotify_info_file_fh(info2)))
return false;
- return !info1->name_len ||
- !memcmp(fanotify_info_name(info1), fanotify_info_name(info2),
- info1->name_len);
+ if (info1->name_len &&
+ memcmp(fanotify_info_name(info1), fanotify_info_name(info2),
+ info1->name_len))
+ return false;
+
+ return !info1->name2_len ||
+ !memcmp(fanotify_info_name2(info1), fanotify_info_name2(info2),
+ info1->name2_len);
}
static bool fanotify_name_event_equal(struct fanotify_name_event *fne1,
diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h
index 7ac6f9f1e4148..8fa3bc0effd45 100644
--- a/fs/notify/fanotify/fanotify.h
+++ b/fs/notify/fanotify/fanotify.h
@@ -40,31 +40,45 @@ struct fanotify_fh {
struct fanotify_info {
/* size of dir_fh/file_fh including fanotify_fh hdr size */
u8 dir_fh_totlen;
+ u8 dir2_fh_totlen;
u8 file_fh_totlen;
u8 name_len;
- u8 pad;
+ u8 name2_len;
+ u8 pad[3];
unsigned char buf[];
/*
* (struct fanotify_fh) dir_fh starts at buf[0]
- * (optional) file_fh starts at buf[dir_fh_totlen]
- * name starts at buf[dir_fh_totlen + file_fh_totlen]
+ * (optional) dir2_fh starts at buf[dir_fh_totlen]
+ * (optional) file_fh starts at buf[dir_fh_totlen + dir2_fh_totlen]
+ * name starts at buf[dir_fh_totlen + dir2_fh_totlen + file_fh_totlen]
+ * ...
*/
#define FANOTIFY_DIR_FH_SIZE(info) ((info)->dir_fh_totlen)
+#define FANOTIFY_DIR2_FH_SIZE(info) ((info)->dir2_fh_totlen)
#define FANOTIFY_FILE_FH_SIZE(info) ((info)->file_fh_totlen)
#define FANOTIFY_NAME_SIZE(info) ((info)->name_len + 1)
+#define FANOTIFY_NAME2_SIZE(info) ((info)->name2_len + 1)
#define FANOTIFY_DIR_FH_OFFSET(info) 0
-#define FANOTIFY_FILE_FH_OFFSET(info) \
+#define FANOTIFY_DIR2_FH_OFFSET(info) \
(FANOTIFY_DIR_FH_OFFSET(info) + FANOTIFY_DIR_FH_SIZE(info))
+#define FANOTIFY_FILE_FH_OFFSET(info) \
+ (FANOTIFY_DIR2_FH_OFFSET(info) + FANOTIFY_DIR2_FH_SIZE(info))
#define FANOTIFY_NAME_OFFSET(info) \
(FANOTIFY_FILE_FH_OFFSET(info) + FANOTIFY_FILE_FH_SIZE(info))
+#define FANOTIFY_NAME2_OFFSET(info) \
+ (FANOTIFY_NAME_OFFSET(info) + FANOTIFY_NAME_SIZE(info))
#define FANOTIFY_DIR_FH_BUF(info) \
((info)->buf + FANOTIFY_DIR_FH_OFFSET(info))
+#define FANOTIFY_DIR2_FH_BUF(info) \
+ ((info)->buf + FANOTIFY_DIR2_FH_OFFSET(info))
#define FANOTIFY_FILE_FH_BUF(info) \
((info)->buf + FANOTIFY_FILE_FH_OFFSET(info))
#define FANOTIFY_NAME_BUF(info) \
((info)->buf + FANOTIFY_NAME_OFFSET(info))
+#define FANOTIFY_NAME2_BUF(info) \
+ ((info)->buf + FANOTIFY_NAME2_OFFSET(info))
} __aligned(4);
static inline bool fanotify_fh_has_ext_buf(struct fanotify_fh *fh)
@@ -106,6 +120,20 @@ static inline struct fanotify_fh *fanotify_info_dir_fh(struct fanotify_info *inf
return (struct fanotify_fh *)FANOTIFY_DIR_FH_BUF(info);
}
+static inline int fanotify_info_dir2_fh_len(struct fanotify_info *info)
+{
+ if (!info->dir2_fh_totlen ||
+ WARN_ON_ONCE(info->dir2_fh_totlen < FANOTIFY_FH_HDR_LEN))
+ return 0;
+
+ return info->dir2_fh_totlen - FANOTIFY_FH_HDR_LEN;
+}
+
+static inline struct fanotify_fh *fanotify_info_dir2_fh(struct fanotify_info *info)
+{
+ return (struct fanotify_fh *)FANOTIFY_DIR2_FH_BUF(info);
+}
+
static inline int fanotify_info_file_fh_len(struct fanotify_info *info)
{
if (!info->file_fh_totlen ||
@@ -128,31 +156,55 @@ static inline char *fanotify_info_name(struct fanotify_info *info)
return FANOTIFY_NAME_BUF(info);
}
+static inline char *fanotify_info_name2(struct fanotify_info *info)
+{
+ if (!info->name2_len)
+ return NULL;
+
+ return FANOTIFY_NAME2_BUF(info);
+}
+
static inline void fanotify_info_init(struct fanotify_info *info)
{
BUILD_BUG_ON(FANOTIFY_FH_HDR_LEN + MAX_HANDLE_SZ > U8_MAX);
BUILD_BUG_ON(NAME_MAX > U8_MAX);
info->dir_fh_totlen = 0;
+ info->dir2_fh_totlen = 0;
info->file_fh_totlen = 0;
info->name_len = 0;
+ info->name2_len = 0;
}
/* These set/copy helpers MUST be called by order */
static inline void fanotify_info_set_dir_fh(struct fanotify_info *info,
unsigned int totlen)
{
- if (WARN_ON_ONCE(info->file_fh_totlen > 0) ||
- WARN_ON_ONCE(info->name_len > 0))
+ if (WARN_ON_ONCE(info->dir2_fh_totlen > 0) ||
+ WARN_ON_ONCE(info->file_fh_totlen > 0) ||
+ WARN_ON_ONCE(info->name_len > 0) ||
+ WARN_ON_ONCE(info->name2_len > 0))
return;
info->dir_fh_totlen = totlen;
}
+static inline void fanotify_info_set_dir2_fh(struct fanotify_info *info,
+ unsigned int totlen)
+{
+ if (WARN_ON_ONCE(info->file_fh_totlen > 0) ||
+ WARN_ON_ONCE(info->name_len > 0) ||
+ WARN_ON_ONCE(info->name2_len > 0))
+ return;
+
+ info->dir2_fh_totlen = totlen;
+}
+
static inline void fanotify_info_set_file_fh(struct fanotify_info *info,
unsigned int totlen)
{
- if (WARN_ON_ONCE(info->name_len > 0))
+ if (WARN_ON_ONCE(info->name_len > 0) ||
+ WARN_ON_ONCE(info->name2_len > 0))
return;
info->file_fh_totlen = totlen;
@@ -161,13 +213,24 @@ static inline void fanotify_info_set_file_fh(struct fanotify_info *info,
static inline void fanotify_info_copy_name(struct fanotify_info *info,
const struct qstr *name)
{
- if (WARN_ON_ONCE(name->len > NAME_MAX))
+ if (WARN_ON_ONCE(name->len > NAME_MAX) ||
+ WARN_ON_ONCE(info->name2_len > 0))
return;
info->name_len = name->len;
strcpy(fanotify_info_name(info), name->name);
}
+static inline void fanotify_info_copy_name2(struct fanotify_info *info,
+ const struct qstr *name)
+{
+ if (WARN_ON_ONCE(name->len > NAME_MAX))
+ return;
+
+ info->name2_len = name->len;
+ strcpy(fanotify_info_name2(info), name->name);
+}
+
/*
* Common structure for fanotify events. Concrete structs are allocated in
* fanotify_handle_event() and freed when the information is retrieved by
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 6b058d652f47b..d69570db5efd2 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -327,11 +327,10 @@ static int process_access_response(struct fsnotify_group *group,
static size_t copy_error_info_to_user(struct fanotify_event *event,
char __user *buf, int count)
{
- struct fanotify_event_info_error info;
+ struct fanotify_event_info_error info = { };
struct fanotify_error_event *fee = FANOTIFY_EE(event);
info.hdr.info_type = FAN_EVENT_INFO_TYPE_ERROR;
- info.hdr.pad = 0;
info.hdr.len = FANOTIFY_ERROR_INFO_LEN;
if (WARN_ON(count < info.hdr.len))
