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* [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
       [not found] <20200414145903.GA11720@infradead.org>
@ 2020-04-14 15:05 ` Luca Stefani
  2020-06-02 16:49   ` [PATCH] " Luca Stefani
  2020-04-14 15:12 ` [PATCH v2] " Luca Stefani
  1 sibling, 1 reply; 9+ messages in thread
From: Luca Stefani @ 2020-04-14 15:05 UTC (permalink / raw)
  Cc: Luca Stefani, freak07, Anton Altaparmakov, linux-ntfs-dev, linux-kernel

If the kernel is built with CFI we hit a __cfi_check_fail
while mounting a partition

Call trace:
__cfi_check_fail+0x1c/0x24
name_to_dev_t+0x0/0x404
iget5_locked+0x594/0x5e8
ntfs_fill_super+0xbfc/0x43ec
mount_bdev+0x30c/0x3cc
ntfs_mount+0x18/0x24
mount_fs+0x1b0/0x380
vfs_kern_mount+0x90/0x398
do_mount+0x5d8/0x1a10
SyS_mount+0x108/0x144
el0_svc_naked+0x34/0x38

Fixing iget5_locked and ilookup5 callers seems enough

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Tested-by: freak07 <michalechner92@googlemail.com>

---
Changes in v2:
* Addressed comments

---
 fs/ntfs/dir.c   |  2 +-
 fs/ntfs/inode.c | 23 ++++++++++++-----------
 fs/ntfs/inode.h |  4 +---
 fs/ntfs/mft.c   |  4 ++--
 4 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
index 3c4811469ae8..e278bfc5ee7f 100644
--- a/fs/ntfs/dir.c
+++ b/fs/ntfs/dir.c
@@ -1503,7 +1503,7 @@ static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
 	na.type = AT_BITMAP;
 	na.name = I30;
 	na.name_len = 4;
-	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
+	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na);
 	if (bmp_vi) {
  		write_inode_now(bmp_vi, !datasync);
 		iput(bmp_vi);
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index d4359a1df3d5..a5d3bebe7a85 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -30,7 +30,7 @@
 /**
  * ntfs_test_inode - compare two (possibly fake) inodes for equality
  * @vi:		vfs inode which to test
- * @na:		ntfs attribute which is being tested with
+ * @data:		data which is being tested with
  *
  * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
  * inode @vi for equality with the ntfs attribute @na.
@@ -43,8 +43,9 @@
  * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
  * allowed to sleep.
  */
-int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
+int ntfs_test_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = (ntfs_attr *)data;
 	ntfs_inode *ni;
 
 	if (vi->i_ino != na->mft_no)
@@ -72,7 +73,7 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
 /**
  * ntfs_init_locked_inode - initialize an inode
  * @vi:		vfs inode to initialize
- * @na:		ntfs attribute which to initialize @vi to
+ * @data:		data which to initialize @vi to
  *
  * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
  * order to enable ntfs_test_inode() to do its work.
@@ -87,8 +88,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
  * NOTE: This function runs with the inode->i_lock spin lock held so it is not
  * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
  */
-static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
+static int ntfs_init_locked_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = (ntfs_attr *)data;
 	ntfs_inode *ni = NTFS_I(vi);
 
 	vi->i_ino = na->mft_no;
@@ -131,7 +133,6 @@ static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
 	return 0;
 }
 
-typedef int (*set_t)(struct inode *, void *);
 static int ntfs_read_locked_inode(struct inode *vi);
 static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
 static int ntfs_read_locked_index_inode(struct inode *base_vi,
@@ -164,8 +165,8 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
 	na.name = NULL;
 	na.name_len = 0;
 
-	vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(sb, mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -225,8 +226,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -280,8 +281,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
index 98e670fbdd31..363e4e820673 100644
--- a/fs/ntfs/inode.h
+++ b/fs/ntfs/inode.h
@@ -253,9 +253,7 @@ typedef struct {
 	ATTR_TYPE type;
 } ntfs_attr;
 
-typedef int (*test_t)(struct inode *, void *);
-
-extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
+extern int ntfs_test_inode(struct inode *vi, void *data);
 
 extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
 extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 3aac5c917afe..58234b42d68f 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		 * dirty code path of the inode dirty code path when writing
 		 * $MFT occurs.
 		 */
-		vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
+		vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
 	}
 	if (vi) {
 		ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
@@ -1019,7 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		vi = igrab(mft_vi);
 		BUG_ON(vi != mft_vi);
 	} else
-		vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
+		vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode,
 				&na);
 	if (!vi) {
 		/*
-- 
2.26.0


^ permalink raw reply related	[flat|nested] 9+ messages in thread
* [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
       [not found] <20200414145903.GA11720@infradead.org>
  2020-04-14 15:05 ` [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type Luca Stefani
@ 2020-04-14 15:12 ` Luca Stefani
  1 sibling, 0 replies; 9+ messages in thread
From: Luca Stefani @ 2020-04-14 15:12 UTC (permalink / raw)
  Cc: Luca Stefani, freak07, Anton Altaparmakov, linux-ntfs-dev, linux-kernel

If the kernel is built with CFI we hit a __cfi_check_fail
while mounting a partition

Call trace:
__cfi_check_fail+0x1c/0x24
name_to_dev_t+0x0/0x404
iget5_locked+0x594/0x5e8
ntfs_fill_super+0xbfc/0x43ec
mount_bdev+0x30c/0x3cc
ntfs_mount+0x18/0x24
mount_fs+0x1b0/0x380
vfs_kern_mount+0x90/0x398
do_mount+0x5d8/0x1a10
SyS_mount+0x108/0x144
el0_svc_naked+0x34/0x38

Fixing iget5_locked and ilookup5 callers seems enough

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Tested-by: freak07 <michalechner92@googlemail.com>
---
 fs/ntfs/dir.c   |  2 +-
 fs/ntfs/inode.c | 23 ++++++++++++-----------
 fs/ntfs/inode.h |  4 +---
 fs/ntfs/mft.c   |  5 ++---
 4 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
index 3c4811469ae8..e278bfc5ee7f 100644
--- a/fs/ntfs/dir.c
+++ b/fs/ntfs/dir.c
@@ -1503,7 +1503,7 @@ static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
 	na.type = AT_BITMAP;
 	na.name = I30;
 	na.name_len = 4;
-	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
+	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na);
 	if (bmp_vi) {
  		write_inode_now(bmp_vi, !datasync);
 		iput(bmp_vi);
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index d4359a1df3d5..34c919bc0dfe 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -30,7 +30,7 @@
 /**
  * ntfs_test_inode - compare two (possibly fake) inodes for equality
  * @vi:		vfs inode which to test
- * @na:		ntfs attribute which is being tested with
+ * @data:		data which is being tested with
  *
  * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
  * inode @vi for equality with the ntfs attribute @na.
@@ -43,8 +43,9 @@
  * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
  * allowed to sleep.
  */
-int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
+int ntfs_test_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = data;
 	ntfs_inode *ni;
 
 	if (vi->i_ino != na->mft_no)
@@ -72,7 +73,7 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
 /**
  * ntfs_init_locked_inode - initialize an inode
  * @vi:		vfs inode to initialize
- * @na:		ntfs attribute which to initialize @vi to
+ * @data:		data which to initialize @vi to
  *
  * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
  * order to enable ntfs_test_inode() to do its work.
@@ -87,8 +88,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
  * NOTE: This function runs with the inode->i_lock spin lock held so it is not
  * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
  */
-static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
+static int ntfs_init_locked_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = data;
 	ntfs_inode *ni = NTFS_I(vi);
 
 	vi->i_ino = na->mft_no;
@@ -131,7 +133,6 @@ static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
 	return 0;
 }
 
-typedef int (*set_t)(struct inode *, void *);
 static int ntfs_read_locked_inode(struct inode *vi);
 static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
 static int ntfs_read_locked_index_inode(struct inode *base_vi,
@@ -164,8 +165,8 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
 	na.name = NULL;
 	na.name_len = 0;
 
-	vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(sb, mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -225,8 +226,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -280,8 +281,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
index 98e670fbdd31..363e4e820673 100644
--- a/fs/ntfs/inode.h
+++ b/fs/ntfs/inode.h
@@ -253,9 +253,7 @@ typedef struct {
 	ATTR_TYPE type;
 } ntfs_attr;
 
-typedef int (*test_t)(struct inode *, void *);
-
-extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
+extern int ntfs_test_inode(struct inode *vi, void *data);
 
 extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
 extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 3aac5c917afe..1f1dbf4c41b5 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		 * dirty code path of the inode dirty code path when writing
 		 * $MFT occurs.
 		 */
-		vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
+		vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
 	}
 	if (vi) {
 		ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
@@ -1019,8 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		vi = igrab(mft_vi);
 		BUG_ON(vi != mft_vi);
 	} else
-		vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
-				&na);
+		vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode, &na);
 	if (!vi) {
 		/*
 		 * The base inode is not in icache, write this extent mft
-- 
2.26.0


^ permalink raw reply related	[flat|nested] 9+ messages in thread
* [PATCH] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
  2020-04-14 15:05 ` [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type Luca Stefani
@ 2020-06-02 16:49   ` Luca Stefani
  0 siblings, 0 replies; 9+ messages in thread
From: Luca Stefani @ 2020-06-02 16:49 UTC (permalink / raw)
  Cc: Luca Stefani, freak07, Anton Altaparmakov, linux-ntfs-dev, linux-kernel

If the kernel is built with CFI we hit a __cfi_check_fail
while mounting a partition

Call trace:
__cfi_check_fail+0x1c/0x24
name_to_dev_t+0x0/0x404
iget5_locked+0x594/0x5e8
ntfs_fill_super+0xbfc/0x43ec
mount_bdev+0x30c/0x3cc
ntfs_mount+0x18/0x24
mount_fs+0x1b0/0x380
vfs_kern_mount+0x90/0x398
do_mount+0x5d8/0x1a10
SyS_mount+0x108/0x144
el0_svc_naked+0x34/0x38

Fixing iget5_locked and ilookup5 callers seems enough

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Tested-by: freak07 <michalechner92@googlemail.com>
---
 fs/ntfs/dir.c   |  2 +-
 fs/ntfs/inode.c | 23 ++++++++++++-----------
 fs/ntfs/inode.h |  4 +---
 fs/ntfs/mft.c   |  5 ++---
 4 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
index 3c4811469ae8..e278bfc5ee7f 100644
--- a/fs/ntfs/dir.c
+++ b/fs/ntfs/dir.c
@@ -1503,7 +1503,7 @@ static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
 	na.type = AT_BITMAP;
 	na.name = I30;
 	na.name_len = 4;
-	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
+	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na);
 	if (bmp_vi) {
  		write_inode_now(bmp_vi, !datasync);
 		iput(bmp_vi);
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index d4359a1df3d5..34c919bc0dfe 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -30,7 +30,7 @@
 /**
  * ntfs_test_inode - compare two (possibly fake) inodes for equality
  * @vi:		vfs inode which to test
- * @na:		ntfs attribute which is being tested with
+ * @data:		data which is being tested with
  *
  * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
  * inode @vi for equality with the ntfs attribute @na.
@@ -43,8 +43,9 @@
  * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
  * allowed to sleep.
  */
-int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
+int ntfs_test_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = data;
 	ntfs_inode *ni;
 
 	if (vi->i_ino != na->mft_no)
@@ -72,7 +73,7 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
 /**
  * ntfs_init_locked_inode - initialize an inode
  * @vi:		vfs inode to initialize
- * @na:		ntfs attribute which to initialize @vi to
+ * @data:		data which to initialize @vi to
  *
  * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
  * order to enable ntfs_test_inode() to do its work.
@@ -87,8 +88,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
  * NOTE: This function runs with the inode->i_lock spin lock held so it is not
  * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
  */
-static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
+static int ntfs_init_locked_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = data;
 	ntfs_inode *ni = NTFS_I(vi);
 
 	vi->i_ino = na->mft_no;
@@ -131,7 +133,6 @@ static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
 	return 0;
 }
 
-typedef int (*set_t)(struct inode *, void *);
 static int ntfs_read_locked_inode(struct inode *vi);
 static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
 static int ntfs_read_locked_index_inode(struct inode *base_vi,
@@ -164,8 +165,8 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
 	na.name = NULL;
 	na.name_len = 0;
 
-	vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(sb, mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -225,8 +226,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -280,8 +281,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
index 98e670fbdd31..363e4e820673 100644
--- a/fs/ntfs/inode.h
+++ b/fs/ntfs/inode.h
@@ -253,9 +253,7 @@ typedef struct {
 	ATTR_TYPE type;
 } ntfs_attr;
 
-typedef int (*test_t)(struct inode *, void *);
-
-extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
+extern int ntfs_test_inode(struct inode *vi, void *data);
 
 extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
 extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 3aac5c917afe..1f1dbf4c41b5 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		 * dirty code path of the inode dirty code path when writing
 		 * $MFT occurs.
 		 */
-		vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
+		vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
 	}
 	if (vi) {
 		ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
@@ -1019,8 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		vi = igrab(mft_vi);
 		BUG_ON(vi != mft_vi);
 	} else
-		vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
-				&na);
+		vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode, &na);
 	if (!vi) {
 		/*
 		 * The base inode is not in icache, write this extent mft
-- 
2.27.0


^ permalink raw reply related	[flat|nested] 9+ messages in thread
* Re: [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
  2021-12-09 14:38   ` Mark-PK Tsai
@ 2021-12-09 15:35     ` Greg KH
  0 siblings, 0 replies; 9+ messages in thread
From: Greg KH @ 2021-12-09 15:35 UTC (permalink / raw)
  To: Mark-PK Tsai
  Cc: luca.stefani.ge1, akpm, anton, clang-built-linux, linux-kernel,
	linux-ntfs-dev, michalechner92, stable, yj.chiang

On Thu, Dec 09, 2021 at 10:38:39PM +0800, Mark-PK Tsai wrote:
> > Clang's Control Flow Integrity (CFI) is a security mechanism that can
> > help prevent JOP chains, deployed extensively in downstream kernels
> > used in Android.
> > 
> > It's deployment is hindered by mismatches in function signatures.  For
> > this case, we make callbacks match their intended function signature,
> > and cast parameters within them rather than casting the callback when
> > passed as a parameter.
> > 
> > When running `mount -t ntfs ...` we observe the following trace:
> > 
> > Call trace:
> > __cfi_check_fail+0x1c/0x24
> > name_to_dev_t+0x0/0x404
> > iget5_locked+0x594/0x5e8
> > ntfs_fill_super+0xbfc/0x43ec
> > mount_bdev+0x30c/0x3cc
> > ntfs_mount+0x18/0x24
> > mount_fs+0x1b0/0x380
> > vfs_kern_mount+0x90/0x398
> > do_mount+0x5d8/0x1a10
> > SyS_mount+0x108/0x144
> > el0_svc_naked+0x34/0x38
> > 
> > Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
> > Tested-by: freak07 <michalechner92@googlemail.com>
> > Acked-by: Anton Altaparmakov <anton@tuxera.com>
> > ---
> >  fs/ntfs/dir.c   |  2 +-
> >  fs/ntfs/inode.c | 27 ++++++++++++++-------------
> >  fs/ntfs/inode.h |  4 +---
> >  fs/ntfs/mft.c   |  4 ++--
> >  4 files changed, 18 insertions(+), 19 deletions(-)
> > 
> 
> Hi,
> 
> I think stable tree should pick this change.
> 
> Below is the mainline commit.
> 
> (1146f7e2dc15 ntfs: fix ntfs_test_inode and ntfs_init_locked_inode function type)
> 
> 5.4 stable have the same issue when CFI is enabled.

Now queued up, thanks.

greg k-h

^ permalink raw reply	[flat|nested] 9+ messages in thread
* [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
  2020-07-18 11:25 ` [PATCH v2] " Luca Stefani
                     ` (2 preceding siblings ...)
  2020-07-20 18:09   ` Nathan Chancellor
@ 2021-12-09 14:38   ` Mark-PK Tsai
  2021-12-09 15:35     ` Greg KH
  3 siblings, 1 reply; 9+ messages in thread
From: Mark-PK Tsai @ 2021-12-09 14:38 UTC (permalink / raw)
  To: luca.stefani.ge1
  Cc: akpm, anton, clang-built-linux, linux-kernel, linux-ntfs-dev,
	michalechner92, stable, mark-pk.tsai, yj.chiang

> Clang's Control Flow Integrity (CFI) is a security mechanism that can
> help prevent JOP chains, deployed extensively in downstream kernels
> used in Android.
> 
> It's deployment is hindered by mismatches in function signatures.  For
> this case, we make callbacks match their intended function signature,
> and cast parameters within them rather than casting the callback when
> passed as a parameter.
> 
> When running `mount -t ntfs ...` we observe the following trace:
> 
> Call trace:
> __cfi_check_fail+0x1c/0x24
> name_to_dev_t+0x0/0x404
> iget5_locked+0x594/0x5e8
> ntfs_fill_super+0xbfc/0x43ec
> mount_bdev+0x30c/0x3cc
> ntfs_mount+0x18/0x24
> mount_fs+0x1b0/0x380
> vfs_kern_mount+0x90/0x398
> do_mount+0x5d8/0x1a10
> SyS_mount+0x108/0x144
> el0_svc_naked+0x34/0x38
> 
> Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
> Tested-by: freak07 <michalechner92@googlemail.com>
> Acked-by: Anton Altaparmakov <anton@tuxera.com>
> ---
>  fs/ntfs/dir.c   |  2 +-
>  fs/ntfs/inode.c | 27 ++++++++++++++-------------
>  fs/ntfs/inode.h |  4 +---
>  fs/ntfs/mft.c   |  4 ++--
>  4 files changed, 18 insertions(+), 19 deletions(-)
> 

Hi,

I think stable tree should pick this change.

Below is the mainline commit.

(1146f7e2dc15 ntfs: fix ntfs_test_inode and ntfs_init_locked_inode function type)

5.4 stable have the same issue when CFI is enabled.

^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
  2020-07-18 11:25 ` [PATCH v2] " Luca Stefani
  2020-07-18 11:55   ` Anton Altaparmakov
  2020-07-20 16:12   ` Nick Desaulniers
@ 2020-07-20 18:09   ` Nathan Chancellor
  2021-12-09 14:38   ` Mark-PK Tsai
  3 siblings, 0 replies; 9+ messages in thread
From: Nathan Chancellor @ 2020-07-20 18:09 UTC (permalink / raw)
  To: Luca Stefani
  Cc: akpm, freak07, Anton Altaparmakov, linux-ntfs-dev, linux-kernel,
	clang-built-linux

On Sat, Jul 18, 2020 at 01:25:13PM +0200, Luca Stefani wrote:
> Clang's Control Flow Integrity (CFI) is a security mechanism that can
> help prevent JOP chains, deployed extensively in downstream kernels
> used in Android.
> 
> It's deployment is hindered by mismatches in function signatures.  For
> this case, we make callbacks match their intended function signature,
> and cast parameters within them rather than casting the callback when
> passed as a parameter.
> 
> When running `mount -t ntfs ...` we observe the following trace:
> 
> Call trace:
> __cfi_check_fail+0x1c/0x24
> name_to_dev_t+0x0/0x404
> iget5_locked+0x594/0x5e8
> ntfs_fill_super+0xbfc/0x43ec
> mount_bdev+0x30c/0x3cc
> ntfs_mount+0x18/0x24
> mount_fs+0x1b0/0x380
> vfs_kern_mount+0x90/0x398
> do_mount+0x5d8/0x1a10
> SyS_mount+0x108/0x144
> el0_svc_naked+0x34/0x38
> 
> Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
> Tested-by: freak07 <michalechner92@googlemail.com>
> Acked-by: Anton Altaparmakov <anton@tuxera.com>

Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>

> ---
>  fs/ntfs/dir.c   |  2 +-
>  fs/ntfs/inode.c | 27 ++++++++++++++-------------
>  fs/ntfs/inode.h |  4 +---
>  fs/ntfs/mft.c   |  4 ++--
>  4 files changed, 18 insertions(+), 19 deletions(-)
> 
> diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
> index 3c4811469ae8..e278bfc5ee7f 100644
> --- a/fs/ntfs/dir.c
> +++ b/fs/ntfs/dir.c
> @@ -1503,7 +1503,7 @@ static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
>  	na.type = AT_BITMAP;
>  	na.name = I30;
>  	na.name_len = 4;
> -	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
> +	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na);
>  	if (bmp_vi) {
>   		write_inode_now(bmp_vi, !datasync);
>  		iput(bmp_vi);
> diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
> index d4359a1df3d5..9bb9f0952b18 100644
> --- a/fs/ntfs/inode.c
> +++ b/fs/ntfs/inode.c
> @@ -30,10 +30,10 @@
>  /**
>   * ntfs_test_inode - compare two (possibly fake) inodes for equality
>   * @vi:		vfs inode which to test
> - * @na:		ntfs attribute which is being tested with
> + * @data:	data which is being tested with
>   *
>   * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
> - * inode @vi for equality with the ntfs attribute @na.
> + * inode @vi for equality with the ntfs attribute @data.
>   *
>   * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
>   * @na->name and @na->name_len are then ignored.
> @@ -43,8 +43,9 @@
>   * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
>   * allowed to sleep.
>   */
> -int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
> +int ntfs_test_inode(struct inode *vi, void *data)
>  {
> +	ntfs_attr *na = (ntfs_attr *)data;
>  	ntfs_inode *ni;
>  
>  	if (vi->i_ino != na->mft_no)
> @@ -72,9 +73,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
>  /**
>   * ntfs_init_locked_inode - initialize an inode
>   * @vi:		vfs inode to initialize
> - * @na:		ntfs attribute which to initialize @vi to
> + * @data:	data which to initialize @vi to
>   *
> - * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
> + * Initialize the vfs inode @vi with the values from the ntfs attribute @data in
>   * order to enable ntfs_test_inode() to do its work.
>   *
>   * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
> @@ -87,8 +88,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
>   * NOTE: This function runs with the inode->i_lock spin lock held so it is not
>   * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
>   */
> -static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
> +static int ntfs_init_locked_inode(struct inode *vi, void *data)
>  {
> +	ntfs_attr *na = (ntfs_attr *)data;
>  	ntfs_inode *ni = NTFS_I(vi);
>  
>  	vi->i_ino = na->mft_no;
> @@ -131,7 +133,6 @@ static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
>  	return 0;
>  }
>  
> -typedef int (*set_t)(struct inode *, void *);
>  static int ntfs_read_locked_inode(struct inode *vi);
>  static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
>  static int ntfs_read_locked_index_inode(struct inode *base_vi,
> @@ -164,8 +165,8 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
>  	na.name = NULL;
>  	na.name_len = 0;
>  
> -	vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
> -			(set_t)ntfs_init_locked_inode, &na);
> +	vi = iget5_locked(sb, mft_no, ntfs_test_inode,
> +			ntfs_init_locked_inode, &na);
>  	if (unlikely(!vi))
>  		return ERR_PTR(-ENOMEM);
>  
> @@ -225,8 +226,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
>  	na.name = name;
>  	na.name_len = name_len;
>  
> -	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
> -			(set_t)ntfs_init_locked_inode, &na);
> +	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
> +			ntfs_init_locked_inode, &na);
>  	if (unlikely(!vi))
>  		return ERR_PTR(-ENOMEM);
>  
> @@ -280,8 +281,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
>  	na.name = name;
>  	na.name_len = name_len;
>  
> -	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
> -			(set_t)ntfs_init_locked_inode, &na);
> +	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
> +			ntfs_init_locked_inode, &na);
>  	if (unlikely(!vi))
>  		return ERR_PTR(-ENOMEM);
>  
> diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
> index 98e670fbdd31..363e4e820673 100644
> --- a/fs/ntfs/inode.h
> +++ b/fs/ntfs/inode.h
> @@ -253,9 +253,7 @@ typedef struct {
>  	ATTR_TYPE type;
>  } ntfs_attr;
>  
> -typedef int (*test_t)(struct inode *, void *);
> -
> -extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
> +extern int ntfs_test_inode(struct inode *vi, void *data);
>  
>  extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
>  extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
> diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
> index fbb9f1bc623d..0d62cd5bb7f8 100644
> --- a/fs/ntfs/mft.c
> +++ b/fs/ntfs/mft.c
> @@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
>  		 * dirty code path of the inode dirty code path when writing
>  		 * $MFT occurs.
>  		 */
> -		vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
> +		vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
>  	}
>  	if (vi) {
>  		ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
> @@ -1019,7 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
>  		vi = igrab(mft_vi);
>  		BUG_ON(vi != mft_vi);
>  	} else
> -		vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
> +		vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode,
>  				&na);
>  	if (!vi) {
>  		/*
> -- 
> 2.27.0
> 

^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
  2020-07-18 11:25 ` [PATCH v2] " Luca Stefani
  2020-07-18 11:55   ` Anton Altaparmakov
@ 2020-07-20 16:12   ` Nick Desaulniers
  2020-07-20 18:09   ` Nathan Chancellor
  2021-12-09 14:38   ` Mark-PK Tsai
  3 siblings, 0 replies; 9+ messages in thread
From: Nick Desaulniers @ 2020-07-20 16:12 UTC (permalink / raw)
  To: Luca Stefani
  Cc: Andrew Morton, freak07, Anton Altaparmakov, linux-ntfs-dev, LKML,
	clang-built-linux

On Sat, Jul 18, 2020 at 4:25 AM Luca Stefani <luca.stefani.ge1@gmail.com> wrote:
>
> Clang's Control Flow Integrity (CFI) is a security mechanism that can
> help prevent JOP chains, deployed extensively in downstream kernels
> used in Android.
>
> It's deployment is hindered by mismatches in function signatures.  For
> this case, we make callbacks match their intended function signature,
> and cast parameters within them rather than casting the callback when
> passed as a parameter.
>
> When running `mount -t ntfs ...` we observe the following trace:
>
> Call trace:
> __cfi_check_fail+0x1c/0x24
> name_to_dev_t+0x0/0x404
> iget5_locked+0x594/0x5e8
> ntfs_fill_super+0xbfc/0x43ec
> mount_bdev+0x30c/0x3cc
> ntfs_mount+0x18/0x24
> mount_fs+0x1b0/0x380
> vfs_kern_mount+0x90/0x398
> do_mount+0x5d8/0x1a10
> SyS_mount+0x108/0x144
> el0_svc_naked+0x34/0x38
>
> Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
> Tested-by: freak07 <michalechner92@googlemail.com>
> Acked-by: Anton Altaparmakov <anton@tuxera.com>

Make sure to set an explicit --to!

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
>  fs/ntfs/dir.c   |  2 +-
>  fs/ntfs/inode.c | 27 ++++++++++++++-------------
>  fs/ntfs/inode.h |  4 +---
>  fs/ntfs/mft.c   |  4 ++--
>  4 files changed, 18 insertions(+), 19 deletions(-)
>
> diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
> index 3c4811469ae8..e278bfc5ee7f 100644
> --- a/fs/ntfs/dir.c
> +++ b/fs/ntfs/dir.c
> @@ -1503,7 +1503,7 @@ static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
>         na.type = AT_BITMAP;
>         na.name = I30;
>         na.name_len = 4;
> -       bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
> +       bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na);
>         if (bmp_vi) {
>                 write_inode_now(bmp_vi, !datasync);
>                 iput(bmp_vi);
> diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
> index d4359a1df3d5..9bb9f0952b18 100644
> --- a/fs/ntfs/inode.c
> +++ b/fs/ntfs/inode.c
> @@ -30,10 +30,10 @@
>  /**
>   * ntfs_test_inode - compare two (possibly fake) inodes for equality
>   * @vi:                vfs inode which to test
> - * @na:                ntfs attribute which is being tested with
> + * @data:      data which is being tested with
>   *
>   * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
> - * inode @vi for equality with the ntfs attribute @na.
> + * inode @vi for equality with the ntfs attribute @data.
>   *
>   * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
>   * @na->name and @na->name_len are then ignored.
> @@ -43,8 +43,9 @@
>   * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
>   * allowed to sleep.
>   */
> -int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
> +int ntfs_test_inode(struct inode *vi, void *data)
>  {
> +       ntfs_attr *na = (ntfs_attr *)data;
>         ntfs_inode *ni;
>
>         if (vi->i_ino != na->mft_no)
> @@ -72,9 +73,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
>  /**
>   * ntfs_init_locked_inode - initialize an inode
>   * @vi:                vfs inode to initialize
> - * @na:                ntfs attribute which to initialize @vi to
> + * @data:      data which to initialize @vi to
>   *
> - * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
> + * Initialize the vfs inode @vi with the values from the ntfs attribute @data in
>   * order to enable ntfs_test_inode() to do its work.
>   *
>   * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
> @@ -87,8 +88,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
>   * NOTE: This function runs with the inode->i_lock spin lock held so it is not
>   * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
>   */
> -static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
> +static int ntfs_init_locked_inode(struct inode *vi, void *data)
>  {
> +       ntfs_attr *na = (ntfs_attr *)data;
>         ntfs_inode *ni = NTFS_I(vi);
>
>         vi->i_ino = na->mft_no;
> @@ -131,7 +133,6 @@ static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
>         return 0;
>  }
>
> -typedef int (*set_t)(struct inode *, void *);
>  static int ntfs_read_locked_inode(struct inode *vi);
>  static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
>  static int ntfs_read_locked_index_inode(struct inode *base_vi,
> @@ -164,8 +165,8 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
>         na.name = NULL;
>         na.name_len = 0;
>
> -       vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
> -                       (set_t)ntfs_init_locked_inode, &na);
> +       vi = iget5_locked(sb, mft_no, ntfs_test_inode,
> +                       ntfs_init_locked_inode, &na);
>         if (unlikely(!vi))
>                 return ERR_PTR(-ENOMEM);
>
> @@ -225,8 +226,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
>         na.name = name;
>         na.name_len = name_len;
>
> -       vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
> -                       (set_t)ntfs_init_locked_inode, &na);
> +       vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
> +                       ntfs_init_locked_inode, &na);
>         if (unlikely(!vi))
>                 return ERR_PTR(-ENOMEM);
>
> @@ -280,8 +281,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
>         na.name = name;
>         na.name_len = name_len;
>
> -       vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
> -                       (set_t)ntfs_init_locked_inode, &na);
> +       vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
> +                       ntfs_init_locked_inode, &na);
>         if (unlikely(!vi))
>                 return ERR_PTR(-ENOMEM);
>
> diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
> index 98e670fbdd31..363e4e820673 100644
> --- a/fs/ntfs/inode.h
> +++ b/fs/ntfs/inode.h
> @@ -253,9 +253,7 @@ typedef struct {
>         ATTR_TYPE type;
>  } ntfs_attr;
>
> -typedef int (*test_t)(struct inode *, void *);
> -
> -extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
> +extern int ntfs_test_inode(struct inode *vi, void *data);
>
>  extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
>  extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
> diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
> index fbb9f1bc623d..0d62cd5bb7f8 100644
> --- a/fs/ntfs/mft.c
> +++ b/fs/ntfs/mft.c
> @@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
>                  * dirty code path of the inode dirty code path when writing
>                  * $MFT occurs.
>                  */
> -               vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
> +               vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
>         }
>         if (vi) {
>                 ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
> @@ -1019,7 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
>                 vi = igrab(mft_vi);
>                 BUG_ON(vi != mft_vi);
>         } else
> -               vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
> +               vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode,
>                                 &na);
>         if (!vi) {
>                 /*
> --
> 2.27.0
>
> --

-- 
Thanks,
~Nick Desaulniers

^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
  2020-07-18 11:25 ` [PATCH v2] " Luca Stefani
@ 2020-07-18 11:55   ` Anton Altaparmakov
  2020-07-20 16:12   ` Nick Desaulniers
                     ` (2 subsequent siblings)
  3 siblings, 0 replies; 9+ messages in thread
From: Anton Altaparmakov @ 2020-07-18 11:55 UTC (permalink / raw)
  To: Andrew Morton
  Cc: freak07, linux-ntfs-dev, LKML, clang-built-linux, Luca Stefani

Hi Andrew,

Please can you merge this patch?  Thanks a lot in advance!

Luca, thank you for the updated patch!

Best regards,

	Anton

> On 18 Jul 2020, at 12:25, Luca Stefani <luca.stefani.ge1@gmail.com> wrote:
> 
> Clang's Control Flow Integrity (CFI) is a security mechanism that can
> help prevent JOP chains, deployed extensively in downstream kernels
> used in Android.
> 
> It's deployment is hindered by mismatches in function signatures.  For
> this case, we make callbacks match their intended function signature,
> and cast parameters within them rather than casting the callback when
> passed as a parameter.
> 
> When running `mount -t ntfs ...` we observe the following trace:
> 
> Call trace:
> __cfi_check_fail+0x1c/0x24
> name_to_dev_t+0x0/0x404
> iget5_locked+0x594/0x5e8
> ntfs_fill_super+0xbfc/0x43ec
> mount_bdev+0x30c/0x3cc
> ntfs_mount+0x18/0x24
> mount_fs+0x1b0/0x380
> vfs_kern_mount+0x90/0x398
> do_mount+0x5d8/0x1a10
> SyS_mount+0x108/0x144
> el0_svc_naked+0x34/0x38
> 
> Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
> Tested-by: freak07 <michalechner92@googlemail.com>
> Acked-by: Anton Altaparmakov <anton@tuxera.com>
> ---
> fs/ntfs/dir.c   |  2 +-
> fs/ntfs/inode.c | 27 ++++++++++++++-------------
> fs/ntfs/inode.h |  4 +---
> fs/ntfs/mft.c   |  4 ++--
> 4 files changed, 18 insertions(+), 19 deletions(-)
> 
> diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
> index 3c4811469ae8..e278bfc5ee7f 100644
> --- a/fs/ntfs/dir.c
> +++ b/fs/ntfs/dir.c
> @@ -1503,7 +1503,7 @@ static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
> 	na.type = AT_BITMAP;
> 	na.name = I30;
> 	na.name_len = 4;
> -	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
> +	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na);
> 	if (bmp_vi) {
>  		write_inode_now(bmp_vi, !datasync);
> 		iput(bmp_vi);
> diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
> index d4359a1df3d5..9bb9f0952b18 100644
> --- a/fs/ntfs/inode.c
> +++ b/fs/ntfs/inode.c
> @@ -30,10 +30,10 @@
> /**
>  * ntfs_test_inode - compare two (possibly fake) inodes for equality
>  * @vi:		vfs inode which to test
> - * @na:		ntfs attribute which is being tested with
> + * @data:	data which is being tested with
>  *
>  * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
> - * inode @vi for equality with the ntfs attribute @na.
> + * inode @vi for equality with the ntfs attribute @data.
>  *
>  * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
>  * @na->name and @na->name_len are then ignored.
> @@ -43,8 +43,9 @@
>  * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
>  * allowed to sleep.
>  */
> -int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
> +int ntfs_test_inode(struct inode *vi, void *data)
> {
> +	ntfs_attr *na = (ntfs_attr *)data;
> 	ntfs_inode *ni;
> 
> 	if (vi->i_ino != na->mft_no)
> @@ -72,9 +73,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
> /**
>  * ntfs_init_locked_inode - initialize an inode
>  * @vi:		vfs inode to initialize
> - * @na:		ntfs attribute which to initialize @vi to
> + * @data:	data which to initialize @vi to
>  *
> - * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
> + * Initialize the vfs inode @vi with the values from the ntfs attribute @data in
>  * order to enable ntfs_test_inode() to do its work.
>  *
>  * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
> @@ -87,8 +88,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
>  * NOTE: This function runs with the inode->i_lock spin lock held so it is not
>  * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
>  */
> -static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
> +static int ntfs_init_locked_inode(struct inode *vi, void *data)
> {
> +	ntfs_attr *na = (ntfs_attr *)data;
> 	ntfs_inode *ni = NTFS_I(vi);
> 
> 	vi->i_ino = na->mft_no;
> @@ -131,7 +133,6 @@ static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
> 	return 0;
> }
> 
> -typedef int (*set_t)(struct inode *, void *);
> static int ntfs_read_locked_inode(struct inode *vi);
> static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
> static int ntfs_read_locked_index_inode(struct inode *base_vi,
> @@ -164,8 +165,8 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
> 	na.name = NULL;
> 	na.name_len = 0;
> 
> -	vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
> -			(set_t)ntfs_init_locked_inode, &na);
> +	vi = iget5_locked(sb, mft_no, ntfs_test_inode,
> +			ntfs_init_locked_inode, &na);
> 	if (unlikely(!vi))
> 		return ERR_PTR(-ENOMEM);
> 
> @@ -225,8 +226,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
> 	na.name = name;
> 	na.name_len = name_len;
> 
> -	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
> -			(set_t)ntfs_init_locked_inode, &na);
> +	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
> +			ntfs_init_locked_inode, &na);
> 	if (unlikely(!vi))
> 		return ERR_PTR(-ENOMEM);
> 
> @@ -280,8 +281,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
> 	na.name = name;
> 	na.name_len = name_len;
> 
> -	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
> -			(set_t)ntfs_init_locked_inode, &na);
> +	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
> +			ntfs_init_locked_inode, &na);
> 	if (unlikely(!vi))
> 		return ERR_PTR(-ENOMEM);
> 
> diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
> index 98e670fbdd31..363e4e820673 100644
> --- a/fs/ntfs/inode.h
> +++ b/fs/ntfs/inode.h
> @@ -253,9 +253,7 @@ typedef struct {
> 	ATTR_TYPE type;
> } ntfs_attr;
> 
> -typedef int (*test_t)(struct inode *, void *);
> -
> -extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
> +extern int ntfs_test_inode(struct inode *vi, void *data);
> 
> extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
> extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
> diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
> index fbb9f1bc623d..0d62cd5bb7f8 100644
> --- a/fs/ntfs/mft.c
> +++ b/fs/ntfs/mft.c
> @@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
> 		 * dirty code path of the inode dirty code path when writing
> 		 * $MFT occurs.
> 		 */
> -		vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
> +		vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
> 	}
> 	if (vi) {
> 		ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
> @@ -1019,7 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
> 		vi = igrab(mft_vi);
> 		BUG_ON(vi != mft_vi);
> 	} else
> -		vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
> +		vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode,
> 				&na);
> 	if (!vi) {
> 		/*
> -- 
> 2.27.0
> 


-- 
Anton Altaparmakov <anton at tuxera.com> (replace at with @)
Lead in File System Development, Tuxera Inc., http://www.tuxera.com/
Linux NTFS maintainer


^ permalink raw reply	[flat|nested] 9+ messages in thread
* [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type
  2020-06-27 19:02 [PATCH] " Luca Stefani
@ 2020-07-18 11:25 ` Luca Stefani
  2020-07-18 11:55   ` Anton Altaparmakov
                     ` (3 more replies)
  0 siblings, 4 replies; 9+ messages in thread
From: Luca Stefani @ 2020-07-18 11:25 UTC (permalink / raw)
  Cc: akpm, Luca Stefani, freak07, Anton Altaparmakov, linux-ntfs-dev,
	linux-kernel, clang-built-linux

Clang's Control Flow Integrity (CFI) is a security mechanism that can
help prevent JOP chains, deployed extensively in downstream kernels
used in Android.

It's deployment is hindered by mismatches in function signatures.  For
this case, we make callbacks match their intended function signature,
and cast parameters within them rather than casting the callback when
passed as a parameter.

When running `mount -t ntfs ...` we observe the following trace:

Call trace:
__cfi_check_fail+0x1c/0x24
name_to_dev_t+0x0/0x404
iget5_locked+0x594/0x5e8
ntfs_fill_super+0xbfc/0x43ec
mount_bdev+0x30c/0x3cc
ntfs_mount+0x18/0x24
mount_fs+0x1b0/0x380
vfs_kern_mount+0x90/0x398
do_mount+0x5d8/0x1a10
SyS_mount+0x108/0x144
el0_svc_naked+0x34/0x38

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Tested-by: freak07 <michalechner92@googlemail.com>
Acked-by: Anton Altaparmakov <anton@tuxera.com>
---
 fs/ntfs/dir.c   |  2 +-
 fs/ntfs/inode.c | 27 ++++++++++++++-------------
 fs/ntfs/inode.h |  4 +---
 fs/ntfs/mft.c   |  4 ++--
 4 files changed, 18 insertions(+), 19 deletions(-)

diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
index 3c4811469ae8..e278bfc5ee7f 100644
--- a/fs/ntfs/dir.c
+++ b/fs/ntfs/dir.c
@@ -1503,7 +1503,7 @@ static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
 	na.type = AT_BITMAP;
 	na.name = I30;
 	na.name_len = 4;
-	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
+	bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na);
 	if (bmp_vi) {
  		write_inode_now(bmp_vi, !datasync);
 		iput(bmp_vi);
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index d4359a1df3d5..9bb9f0952b18 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -30,10 +30,10 @@
 /**
  * ntfs_test_inode - compare two (possibly fake) inodes for equality
  * @vi:		vfs inode which to test
- * @na:		ntfs attribute which is being tested with
+ * @data:	data which is being tested with
  *
  * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
- * inode @vi for equality with the ntfs attribute @na.
+ * inode @vi for equality with the ntfs attribute @data.
  *
  * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
  * @na->name and @na->name_len are then ignored.
@@ -43,8 +43,9 @@
  * NOTE: This function runs with the inode_hash_lock spin lock held so it is not
  * allowed to sleep.
  */
-int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
+int ntfs_test_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = (ntfs_attr *)data;
 	ntfs_inode *ni;
 
 	if (vi->i_ino != na->mft_no)
@@ -72,9 +73,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
 /**
  * ntfs_init_locked_inode - initialize an inode
  * @vi:		vfs inode to initialize
- * @na:		ntfs attribute which to initialize @vi to
+ * @data:	data which to initialize @vi to
  *
- * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
+ * Initialize the vfs inode @vi with the values from the ntfs attribute @data in
  * order to enable ntfs_test_inode() to do its work.
  *
  * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
@@ -87,8 +88,9 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
  * NOTE: This function runs with the inode->i_lock spin lock held so it is not
  * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
  */
-static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
+static int ntfs_init_locked_inode(struct inode *vi, void *data)
 {
+	ntfs_attr *na = (ntfs_attr *)data;
 	ntfs_inode *ni = NTFS_I(vi);
 
 	vi->i_ino = na->mft_no;
@@ -131,7 +133,6 @@ static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
 	return 0;
 }
 
-typedef int (*set_t)(struct inode *, void *);
 static int ntfs_read_locked_inode(struct inode *vi);
 static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
 static int ntfs_read_locked_index_inode(struct inode *base_vi,
@@ -164,8 +165,8 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
 	na.name = NULL;
 	na.name_len = 0;
 
-	vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(sb, mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -225,8 +226,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
@@ -280,8 +281,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
 	na.name = name;
 	na.name_len = name_len;
 
-	vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
-			(set_t)ntfs_init_locked_inode, &na);
+	vi = iget5_locked(base_vi->i_sb, na.mft_no, ntfs_test_inode,
+			ntfs_init_locked_inode, &na);
 	if (unlikely(!vi))
 		return ERR_PTR(-ENOMEM);
 
diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
index 98e670fbdd31..363e4e820673 100644
--- a/fs/ntfs/inode.h
+++ b/fs/ntfs/inode.h
@@ -253,9 +253,7 @@ typedef struct {
 	ATTR_TYPE type;
 } ntfs_attr;
 
-typedef int (*test_t)(struct inode *, void *);
-
-extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
+extern int ntfs_test_inode(struct inode *vi, void *data);
 
 extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
 extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index fbb9f1bc623d..0d62cd5bb7f8 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		 * dirty code path of the inode dirty code path when writing
 		 * $MFT occurs.
 		 */
-		vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
+		vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
 	}
 	if (vi) {
 		ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
@@ -1019,7 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
 		vi = igrab(mft_vi);
 		BUG_ON(vi != mft_vi);
 	} else
-		vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
+		vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode,
 				&na);
 	if (!vi) {
 		/*
-- 
2.27.0


^ permalink raw reply related	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2021-12-09 15:35 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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2020-04-14 15:05 ` [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode function type Luca Stefani
2020-06-02 16:49   ` [PATCH] " Luca Stefani
2020-04-14 15:12 ` [PATCH v2] " Luca Stefani
2020-06-27 19:02 [PATCH] " Luca Stefani
2020-07-18 11:25 ` [PATCH v2] " Luca Stefani
2020-07-18 11:55   ` Anton Altaparmakov
2020-07-20 16:12   ` Nick Desaulniers
2020-07-20 18:09   ` Nathan Chancellor
2021-12-09 14:38   ` Mark-PK Tsai
2021-12-09 15:35     ` Greg KH

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