[PATCH v5 00/18] compat_ioctl.c removal, part 2/3

[PATCH v5 00/18] compat_ioctl.c removal, part 2/3

[Arnd Bergmann]

This is a follow-up to part 1/3 that I posted after -rc2.
I hope these are still largely uncontroversial changes, and
I would like to get them into linux-5.4.

Part 1 was in

https://lore.kernel.org/lkml/CAPcyv4i_nHzV155RcgnAQ189aq2Lfd2g8pA1D5NbZqo9E_u+Dw@mail.gmail.com/

Part 3 will be one kernel release after part 2 is merged,
as that still needs a little extra work.

The entire series is available at

git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git compat_ioctl

      Arnd

Al Viro (2):
  compat_ioctl: unify copy-in of ppp filters
  compat_ioctl: move PPPIOCSCOMPRESS to ppp_generic

Arnd Bergmann (16):
  xfs: compat_ioctl: use compat_ptr()
  xfs: compat_ioctl: add missing conversions
  gfs2: add compat_ioctl support
  fs: compat_ioctl: move FITRIM emulation into file systems
  watchdog: cpwd: use generic compat_ptr_ioctl
  compat_ioctl: move WDIOC handling into wdt drivers
  compat_ioctl: reimplement SG_IO handling
  af_unix: add compat_ioctl support
  compat_ioctl: handle SIOCOUTQNSD
  compat_ioctl: move SIOCOUTQ out of compat_ioctl.c
  tty: handle compat PPP ioctls
  compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t
  compat_ioctl: ppp: move simple commands into ppp_generic.c
  compat_ioctl: move SG_GET_REQUEST_TABLE handling
  pktcdvd: add compat_ioctl handler
  scsi: sd: enable compat ioctls for sed-opal

 Documentation/networking/ppp_generic.txt  |   2 +
 arch/powerpc/platforms/52xx/mpc52xx_gpt.c |   1 +
 arch/um/drivers/harddog_kern.c            |   1 +
 block/scsi_ioctl.c                        | 132 ++++++++-
 drivers/block/pktcdvd.c                   |  25 ++
 drivers/char/ipmi/ipmi_watchdog.c         |   1 +
 drivers/hwmon/fschmd.c                    |   1 +
 drivers/net/ppp/ppp_generic.c             | 245 ++++++++++-----
 drivers/rtc/rtc-ds1374.c                  |   1 +
 drivers/scsi/sd.c                         |  14 +-
 drivers/scsi/sg.c                         |  59 +++-
 drivers/tty/tty_io.c                      |   5 +
 drivers/watchdog/acquirewdt.c             |   1 +
 drivers/watchdog/advantechwdt.c           |   1 +
 drivers/watchdog/alim1535_wdt.c           |   1 +
 drivers/watchdog/alim7101_wdt.c           |   1 +
 drivers/watchdog/ar7_wdt.c                |   1 +
 drivers/watchdog/at91rm9200_wdt.c         |   1 +
 drivers/watchdog/ath79_wdt.c              |   1 +
 drivers/watchdog/bcm63xx_wdt.c            |   1 +
 drivers/watchdog/cpu5wdt.c                |   1 +
 drivers/watchdog/cpwd.c                   |  25 +-
 drivers/watchdog/eurotechwdt.c            |   1 +
 drivers/watchdog/f71808e_wdt.c            |   1 +
 drivers/watchdog/gef_wdt.c                |   1 +
 drivers/watchdog/geodewdt.c               |   1 +
 drivers/watchdog/ib700wdt.c               |   1 +
 drivers/watchdog/ibmasr.c                 |   1 +
 drivers/watchdog/indydog.c                |   1 +
 drivers/watchdog/intel_scu_watchdog.c     |   1 +
 drivers/watchdog/iop_wdt.c                |   1 +
 drivers/watchdog/it8712f_wdt.c            |   1 +
 drivers/watchdog/ixp4xx_wdt.c             |   1 +
 drivers/watchdog/ks8695_wdt.c             |   1 +
 drivers/watchdog/m54xx_wdt.c              |   1 +
 drivers/watchdog/machzwd.c                |   1 +
 drivers/watchdog/mixcomwd.c               |   1 +
 drivers/watchdog/mtx-1_wdt.c              |   1 +
 drivers/watchdog/mv64x60_wdt.c            |   1 +
 drivers/watchdog/nuc900_wdt.c             |   1 +
 drivers/watchdog/nv_tco.c                 |   1 +
 drivers/watchdog/pc87413_wdt.c            |   1 +
 drivers/watchdog/pcwd.c                   |   1 +
 drivers/watchdog/pcwd_pci.c               |   1 +
 drivers/watchdog/pcwd_usb.c               |   1 +
 drivers/watchdog/pika_wdt.c               |   1 +
 drivers/watchdog/pnx833x_wdt.c            |   1 +
 drivers/watchdog/rc32434_wdt.c            |   1 +
 drivers/watchdog/rdc321x_wdt.c            |   1 +
 drivers/watchdog/riowd.c                  |   1 +
 drivers/watchdog/sa1100_wdt.c             |   1 +
 drivers/watchdog/sb_wdog.c                |   1 +
 drivers/watchdog/sbc60xxwdt.c             |   1 +
 drivers/watchdog/sbc7240_wdt.c            |   1 +
 drivers/watchdog/sbc_epx_c3.c             |   1 +
 drivers/watchdog/sbc_fitpc2_wdt.c         |   1 +
 drivers/watchdog/sc1200wdt.c              |   1 +
 drivers/watchdog/sc520_wdt.c              |   1 +
 drivers/watchdog/sch311x_wdt.c            |   1 +
 drivers/watchdog/scx200_wdt.c             |   1 +
 drivers/watchdog/smsc37b787_wdt.c         |   1 +
 drivers/watchdog/w83877f_wdt.c            |   1 +
 drivers/watchdog/w83977f_wdt.c            |   1 +
 drivers/watchdog/wafer5823wdt.c           |   1 +
 drivers/watchdog/watchdog_dev.c           |   1 +
 drivers/watchdog/wdrtas.c                 |   1 +
 drivers/watchdog/wdt.c                    |   1 +
 drivers/watchdog/wdt285.c                 |   1 +
 drivers/watchdog/wdt977.c                 |   1 +
 drivers/watchdog/wdt_pci.c                |   1 +
 fs/compat_ioctl.c                         | 346 +---------------------
 fs/ecryptfs/file.c                        |   1 +
 fs/ext4/ioctl.c                           |   1 +
 fs/f2fs/file.c                            |   1 +
 fs/gfs2/file.c                            |  24 ++
 fs/hpfs/dir.c                             |   1 +
 fs/hpfs/file.c                            |   1 +
 fs/nilfs2/ioctl.c                         |   1 +
 fs/ocfs2/ioctl.c                          |   1 +
 fs/xfs/xfs_ioctl32.c                      |  11 +-
 include/linux/blkdev.h                    |   2 +
 include/uapi/linux/ppp-ioctl.h            |   2 +
 include/uapi/linux/ppp_defs.h             |  14 +
 lib/iov_iter.c                            |   1 +
 net/socket.c                              |   3 +
 net/unix/af_unix.c                        |  19 ++
 86 files changed, 526 insertions(+), 472 deletions(-)

-- 
2.20.0

Cc: davem@davemloft.net
Cc: axboe@kernel.dk
Cc: linux-block@vger.kernel.org
Cc: minyard@acm.org
Cc: gregkh@linuxfoundation.org
Cc: linux@roeck-us.net
Cc: alexandre.belloni@bootlin.com
Cc: jejb@linux.ibm.com
Cc: martin.petersen@oracle.com
Cc: dgilbert@interlog.com
Cc: jslaby@suse.com
Cc: wim@linux-watchdog.org
Cc: viro@zeniv.linux.org.uk
Cc: tytso@mit.edu
Cc: adilger.kernel@dilger.ca
Cc: jaegeuk@kernel.org
Cc: rpeterso@redhat.com
Cc: agruenba@redhat.com
Cc: mikulas@artax.karlin.mff.cuni.cz
Cc: konishi.ryusuke@gmail.com
Cc: jlbec@evilplan.org
Cc: joseph.qi@linux.alibaba.com
Cc: darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: openipmi-developer@lists.sourceforge.net
Cc: linux-hwmon@vger.kernel.org
Cc: linux-ppp@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: linux-watchdog@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: ecryptfs@vger.kernel.org
Cc: linux-ext4@vger.kernel.org
Cc: linux-f2fs-devel@lists.sourceforge.net
Cc: cluster-devel@redhat.com
Cc: linux-nilfs@vger.kernel.org
Cc: ocfs2-devel@oss.oracle.com

[PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Arnd Bergmann]

For 31-bit s390 user space, we have to pass pointer arguments through
compat_ptr() in the compat_ioctl handler.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 fs/xfs/xfs_ioctl32.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index 7fcf7569743f..ad91e81a2fcf 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -547,7 +547,7 @@ xfs_file_compat_ioctl(
 	struct inode		*inode = file_inode(filp);
 	struct xfs_inode	*ip = XFS_I(inode);
 	struct xfs_mount	*mp = ip->i_mount;
-	void			__user *arg = (void __user *)p;
+	void			__user *arg = compat_ptr(p);
 	int			error;
 
 	trace_xfs_file_compat_ioctl(ip);
@@ -576,7 +576,7 @@ xfs_file_compat_ioctl(
 	case XFS_IOC_SCRUB_METADATA:
 	case XFS_IOC_BULKSTAT:
 	case XFS_IOC_INUMBERS:
-		return xfs_file_ioctl(filp, cmd, p);
+		return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
 #if !defined(BROKEN_X86_ALIGNMENT) || defined(CONFIG_X86_X32)
 	/*
 	 * These are handled fine if no alignment issues.  To support x32
@@ -602,7 +602,7 @@ xfs_file_compat_ioctl(
 	 */
 	case XFS_IOC_SWAPEXT:
 #endif
-		return xfs_file_ioctl(filp, cmd, p);
+		return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
 #endif
 #if defined(BROKEN_X86_ALIGNMENT)
 	case XFS_IOC_ALLOCSP_32:
@@ -653,7 +653,7 @@ xfs_file_compat_ioctl(
 	case XFS_IOC_SETXFLAGS_32:
 	case XFS_IOC_GETVERSION_32:
 		cmd = _NATIVE_IOC(cmd, long);
-		return xfs_file_ioctl(filp, cmd, p);
+		return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
 	case XFS_IOC_SWAPEXT_32: {
 		struct xfs_swapext	  sxp;
 		struct compat_xfs_swapext __user *sxu = arg;
-- 
2.20.0

[PATCH v5 02/18] xfs: compat_ioctl: add missing conversions

[Arnd Bergmann]

FS_IOC_GETFSLABEL/FS_IOC_SETFSLABEL were added in linux-4.18
in xfs, but not in the compat_ioctl case, so add them here.

FITRIM was added earlier and also lacks a line the same function,
but this is ok because there is an entry in fs/compat_ioctl.c for
it.

Adding all three here to keep the native and compat ioctl handlers
in sync.

Cc: stable@vger.kernel.org
Fixes: f7664b31975b ("xfs: implement online get/set fs label")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 fs/xfs/xfs_ioctl32.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index ad91e81a2fcf..63bdc4c1535b 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -576,6 +576,9 @@ xfs_file_compat_ioctl(
 	case XFS_IOC_SCRUB_METADATA:
 	case XFS_IOC_BULKSTAT:
 	case XFS_IOC_INUMBERS:
+	case FITRIM:
+	case FS_IOC_GETFSLABEL:
+	case FS_IOC_SETFSLABEL:
 		return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
 #if !defined(BROKEN_X86_ALIGNMENT) || defined(CONFIG_X86_X32)
 	/*
-- 
2.20.0

[PATCH v5 03/18] gfs2: add compat_ioctl support

[Arnd Bergmann]

Out of the four ioctl commands supported on gfs2, only FITRIM
works in compat mode.

Add a proper handler based on the ext4 implementation.

Fixes: 6ddc5c3ddf25 ("gfs2: getlabel support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 fs/gfs2/file.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 52fa1ef8400b..49287f0b96d0 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -6,6 +6,7 @@
 
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/compat.h>
 #include <linux/completion.h>
 #include <linux/buffer_head.h>
 #include <linux/pagemap.h>
@@ -354,6 +355,25 @@ static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	return -ENOTTY;
 }
 
+#ifdef CONFIG_COMPAT
+static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	/* These are just misnamed, they actually get/put from/to user an int */
+	switch(cmd) {
+	case FS_IOC32_GETFLAGS:
+		cmd = FS_IOC_GETFLAGS;
+		break;
+	case FS_IOC32_SETFLAGS:
+		cmd = FS_IOC_SETFLAGS;
+		break;
+	}
+
+	return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
+}
+#else
+#define gfs2_compat_ioctl NULL
+#endif
+
 /**
  * gfs2_size_hint - Give a hint to the size of a write request
  * @filep: The struct file
@@ -1294,6 +1314,7 @@ const struct file_operations gfs2_file_fops = {
 	.write_iter	= gfs2_file_write_iter,
 	.iopoll		= iomap_dio_iopoll,
 	.unlocked_ioctl	= gfs2_ioctl,
+	.compat_ioctl	= gfs2_compat_ioctl,
 	.mmap		= gfs2_mmap,
 	.open		= gfs2_open,
 	.release	= gfs2_release,
@@ -1309,6 +1330,7 @@ const struct file_operations gfs2_file_fops = {
 const struct file_operations gfs2_dir_fops = {
 	.iterate_shared	= gfs2_readdir,
 	.unlocked_ioctl	= gfs2_ioctl,
+	.compat_ioctl	= gfs2_compat_ioctl,
 	.open		= gfs2_open,
 	.release	= gfs2_release,
 	.fsync		= gfs2_fsync,
@@ -1325,6 +1347,7 @@ const struct file_operations gfs2_file_fops_nolock = {
 	.write_iter	= gfs2_file_write_iter,
 	.iopoll		= iomap_dio_iopoll,
 	.unlocked_ioctl	= gfs2_ioctl,
+	.compat_ioctl	= gfs2_compat_ioctl,
 	.mmap		= gfs2_mmap,
 	.open		= gfs2_open,
 	.release	= gfs2_release,
@@ -1338,6 +1361,7 @@ const struct file_operations gfs2_file_fops_nolock = {
 const struct file_operations gfs2_dir_fops_nolock = {
 	.iterate_shared	= gfs2_readdir,
 	.unlocked_ioctl	= gfs2_ioctl,
+	.compat_ioctl	= gfs2_compat_ioctl,
 	.open		= gfs2_open,
 	.release	= gfs2_release,
 	.fsync		= gfs2_fsync,
-- 
2.20.0

[PATCH v5 04/18] fs: compat_ioctl: move FITRIM emulation into file systems

[Arnd Bergmann]

Remove the special case for FITRIM, and make file systems
handle that like all other ioctl commands with their own
handlers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 fs/compat_ioctl.c  | 2 --
 fs/ecryptfs/file.c | 1 +
 fs/ext4/ioctl.c    | 1 +
 fs/f2fs/file.c     | 1 +
 fs/hpfs/dir.c      | 1 +
 fs/hpfs/file.c     | 1 +
 fs/nilfs2/ioctl.c  | 1 +
 fs/ocfs2/ioctl.c   | 1 +
 8 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 1e740f4406d3..b20228c19ccd 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -345,8 +345,6 @@ static int ppp_scompress(struct file *file, unsigned int cmd,
 static unsigned int ioctl_pointer[] = {
 /* Little t */
 COMPATIBLE_IOCTL(TIOCOUTQ)
-/* 'X' - originally XFS but some now in the VFS */
-COMPATIBLE_IOCTL(FITRIM)
 #ifdef CONFIG_BLOCK
 /* Big S */
 COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index feecb57defa7..5fb45d865ce5 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -378,6 +378,7 @@ ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		return rc;
 
 	switch (cmd) {
+	case FITRIM:
 	case FS_IOC32_GETFLAGS:
 	case FS_IOC32_SETFLAGS:
 	case FS_IOC32_GETVERSION:
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 442f7ef873fc..7a6e0f0f69e2 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -1227,6 +1227,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	}
 	case EXT4_IOC_MOVE_EXT:
 	case EXT4_IOC_RESIZE_FS:
+	case FITRIM:
 	case EXT4_IOC_PRECACHE_EXTENTS:
 	case EXT4_IOC_SET_ENCRYPTION_POLICY:
 	case EXT4_IOC_GET_ENCRYPTION_PWSALT:
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 3e58a6f697dd..befd2692160c 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3216,6 +3216,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case F2FS_IOC_RELEASE_VOLATILE_WRITE:
 	case F2FS_IOC_ABORT_VOLATILE_WRITE:
 	case F2FS_IOC_SHUTDOWN:
+	case FITRIM:
 	case F2FS_IOC_SET_ENCRYPTION_POLICY:
 	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
 	case F2FS_IOC_GET_ENCRYPTION_POLICY:
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
index d85230c84ef2..f32f15669996 100644
--- a/fs/hpfs/dir.c
+++ b/fs/hpfs/dir.c
@@ -325,4 +325,5 @@ const struct file_operations hpfs_dir_ops =
 	.release	= hpfs_dir_release,
 	.fsync		= hpfs_file_fsync,
 	.unlocked_ioctl	= hpfs_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index 1ecec124e76f..b36abf9cb345 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -215,6 +215,7 @@ const struct file_operations hpfs_file_ops =
 	.fsync		= hpfs_file_fsync,
 	.splice_read	= generic_file_splice_read,
 	.unlocked_ioctl	= hpfs_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 const struct inode_operations hpfs_file_iops =
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 91b9dac6b2cc..4ba73dbf3e8d 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -1354,6 +1354,7 @@ long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	case NILFS_IOCTL_SYNC:
 	case NILFS_IOCTL_RESIZE:
 	case NILFS_IOCTL_SET_ALLOC_RANGE:
+	case FITRIM:
 		break;
 	default:
 		return -ENOIOCTLCMD;
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index d6f7b299eb23..2d517b5ec6ac 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -985,6 +985,7 @@ long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 			return -EFAULT;
 
 		return ocfs2_info_handle(inode, &info, 1);
+	case FITRIM:
 	case OCFS2_IOC_MOVE_EXT:
 		break;
 	default:
-- 
2.20.0

[PATCH v5 05/18] watchdog: cpwd: use generic compat_ptr_ioctl

[Arnd Bergmann]

The cpwd_compat_ioctl() contains a bogus mutex that dates
back to a leftover BKL instance.

Simplify the implementation by using the new compat_ptr_ioctl()
helper function that will do the right thing for all calls
here.

Note that WIOCSTART/WIOCSTOP don't take any arguments, so
the compat_ptr() conversion is not needed here, but it also
doesn't hurt.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/watchdog/cpwd.c | 25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index b973b31179df..9393be584e72 100644
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -473,29 +473,6 @@ static long cpwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return 0;
 }
 
-static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
-			      unsigned long arg)
-{
-	int rval = -ENOIOCTLCMD;
-
-	switch (cmd) {
-	/* solaris ioctls are specific to this driver */
-	case WIOCSTART:
-	case WIOCSTOP:
-	case WIOCGSTAT:
-		mutex_lock(&cpwd_mutex);
-		rval = cpwd_ioctl(file, cmd, arg);
-		mutex_unlock(&cpwd_mutex);
-		break;
-
-	/* everything else is handled by the generic compat layer */
-	default:
-		break;
-	}
-
-	return rval;
-}
-
 static ssize_t cpwd_write(struct file *file, const char __user *buf,
 			  size_t count, loff_t *ppos)
 {
@@ -520,7 +497,7 @@ static ssize_t cpwd_read(struct file *file, char __user *buffer,
 static const struct file_operations cpwd_fops = {
 	.owner =		THIS_MODULE,
 	.unlocked_ioctl =	cpwd_ioctl,
-	.compat_ioctl =		cpwd_compat_ioctl,
+	.compat_ioctl =		compat_ptr_ioctl,
 	.open =			cpwd_open,
 	.write =		cpwd_write,
 	.read =			cpwd_read,
-- 
2.20.0

[PATCH v5 06/18] compat_ioctl: move WDIOC handling into wdt drivers

[Arnd Bergmann]

All watchdog drivers implement the same set of ioctl commands, and
fortunately all of them are compatible between 32-bit and 64-bit
architectures.

Modern drivers always go through drivers/watchdog/wdt.c as an abstraction
layer, but older ones implement their own file_operations on a character
device for this.

Move the handling from fs/compat_ioctl.c into the individual drivers.

Note that most of the legacy drivers will never be used on 64-bit
hardware, because they are for an old 32-bit SoC implementation, but
doing them all at once is safer than trying to guess which ones do
or do not need the compat_ioctl handling.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/powerpc/platforms/52xx/mpc52xx_gpt.c |  1 +
 arch/um/drivers/harddog_kern.c            |  1 +
 drivers/char/ipmi/ipmi_watchdog.c         |  1 +
 drivers/hwmon/fschmd.c                    |  1 +
 drivers/rtc/rtc-ds1374.c                  |  1 +
 drivers/watchdog/acquirewdt.c             |  1 +
 drivers/watchdog/advantechwdt.c           |  1 +
 drivers/watchdog/alim1535_wdt.c           |  1 +
 drivers/watchdog/alim7101_wdt.c           |  1 +
 drivers/watchdog/ar7_wdt.c                |  1 +
 drivers/watchdog/at91rm9200_wdt.c         |  1 +
 drivers/watchdog/ath79_wdt.c              |  1 +
 drivers/watchdog/bcm63xx_wdt.c            |  1 +
 drivers/watchdog/cpu5wdt.c                |  1 +
 drivers/watchdog/eurotechwdt.c            |  1 +
 drivers/watchdog/f71808e_wdt.c            |  1 +
 drivers/watchdog/gef_wdt.c                |  1 +
 drivers/watchdog/geodewdt.c               |  1 +
 drivers/watchdog/ib700wdt.c               |  1 +
 drivers/watchdog/ibmasr.c                 |  1 +
 drivers/watchdog/indydog.c                |  1 +
 drivers/watchdog/intel_scu_watchdog.c     |  1 +
 drivers/watchdog/iop_wdt.c                |  1 +
 drivers/watchdog/it8712f_wdt.c            |  1 +
 drivers/watchdog/ixp4xx_wdt.c             |  1 +
 drivers/watchdog/ks8695_wdt.c             |  1 +
 drivers/watchdog/m54xx_wdt.c              |  1 +
 drivers/watchdog/machzwd.c                |  1 +
 drivers/watchdog/mixcomwd.c               |  1 +
 drivers/watchdog/mtx-1_wdt.c              |  1 +
 drivers/watchdog/mv64x60_wdt.c            |  1 +
 drivers/watchdog/nuc900_wdt.c             |  1 +
 drivers/watchdog/nv_tco.c                 |  1 +
 drivers/watchdog/pc87413_wdt.c            |  1 +
 drivers/watchdog/pcwd.c                   |  1 +
 drivers/watchdog/pcwd_pci.c               |  1 +
 drivers/watchdog/pcwd_usb.c               |  1 +
 drivers/watchdog/pika_wdt.c               |  1 +
 drivers/watchdog/pnx833x_wdt.c            |  1 +
 drivers/watchdog/rc32434_wdt.c            |  1 +
 drivers/watchdog/rdc321x_wdt.c            |  1 +
 drivers/watchdog/riowd.c                  |  1 +
 drivers/watchdog/sa1100_wdt.c             |  1 +
 drivers/watchdog/sb_wdog.c                |  1 +
 drivers/watchdog/sbc60xxwdt.c             |  1 +
 drivers/watchdog/sbc7240_wdt.c            |  1 +
 drivers/watchdog/sbc_epx_c3.c             |  1 +
 drivers/watchdog/sbc_fitpc2_wdt.c         |  1 +
 drivers/watchdog/sc1200wdt.c              |  1 +
 drivers/watchdog/sc520_wdt.c              |  1 +
 drivers/watchdog/sch311x_wdt.c            |  1 +
 drivers/watchdog/scx200_wdt.c             |  1 +
 drivers/watchdog/smsc37b787_wdt.c         |  1 +
 drivers/watchdog/w83877f_wdt.c            |  1 +
 drivers/watchdog/w83977f_wdt.c            |  1 +
 drivers/watchdog/wafer5823wdt.c           |  1 +
 drivers/watchdog/watchdog_dev.c           |  1 +
 drivers/watchdog/wdrtas.c                 |  1 +
 drivers/watchdog/wdt.c                    |  1 +
 drivers/watchdog/wdt285.c                 |  1 +
 drivers/watchdog/wdt977.c                 |  1 +
 drivers/watchdog/wdt_pci.c                |  1 +
 fs/compat_ioctl.c                         | 11 -----------
 63 files changed, 62 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
index ba12dc14a3d1..8c0d324f657e 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
@@ -650,6 +650,7 @@ static const struct file_operations mpc52xx_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= mpc52xx_wdt_write,
 	.unlocked_ioctl = mpc52xx_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= mpc52xx_wdt_open,
 	.release	= mpc52xx_wdt_release,
 };
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
index 000cb69ba0bc..e6d4f43deba8 100644
--- a/arch/um/drivers/harddog_kern.c
+++ b/arch/um/drivers/harddog_kern.c
@@ -165,6 +165,7 @@ static const struct file_operations harddog_fops = {
 	.owner		= THIS_MODULE,
 	.write		= harddog_write,
 	.unlocked_ioctl	= harddog_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= harddog_open,
 	.release	= harddog_release,
 	.llseek		= no_llseek,
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 74c6d1f34132..55986e10a124 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -893,6 +893,7 @@ static const struct file_operations ipmi_wdog_fops = {
 	.poll    = ipmi_poll,
 	.write   = ipmi_write,
 	.unlocked_ioctl = ipmi_unlocked_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open    = ipmi_open,
 	.release = ipmi_close,
 	.fasync  = ipmi_fasync,
diff --git a/drivers/hwmon/fschmd.c b/drivers/hwmon/fschmd.c
index fa0c2f1fb443..4136643d8e0c 100644
--- a/drivers/hwmon/fschmd.c
+++ b/drivers/hwmon/fschmd.c
@@ -954,6 +954,7 @@ static const struct file_operations watchdog_fops = {
 	.release = watchdog_release,
 	.write = watchdog_write,
 	.unlocked_ioctl = watchdog_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 };
 
 
diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 225a8df1d4e9..7e73be9898ac 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -586,6 +586,7 @@ static const struct file_operations ds1374_wdt_fops = {
 	.owner			= THIS_MODULE,
 	.read			= ds1374_wdt_read,
 	.unlocked_ioctl		= ds1374_wdt_unlocked_ioctl,
+	.compat_ioctl		= compat_ptr_ioctl,
 	.write			= ds1374_wdt_write,
 	.open                   = ds1374_wdt_open,
 	.release                = ds1374_wdt_release,
diff --git a/drivers/watchdog/acquirewdt.c b/drivers/watchdog/acquirewdt.c
index 848db958411e..bc6f333565d3 100644
--- a/drivers/watchdog/acquirewdt.c
+++ b/drivers/watchdog/acquirewdt.c
@@ -221,6 +221,7 @@ static const struct file_operations acq_fops = {
 	.llseek		= no_llseek,
 	.write		= acq_write,
 	.unlocked_ioctl	= acq_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= acq_open,
 	.release	= acq_close,
 };
diff --git a/drivers/watchdog/advantechwdt.c b/drivers/watchdog/advantechwdt.c
index 0d02bb275b3d..0e4c18a2aa42 100644
--- a/drivers/watchdog/advantechwdt.c
+++ b/drivers/watchdog/advantechwdt.c
@@ -220,6 +220,7 @@ static const struct file_operations advwdt_fops = {
 	.llseek		= no_llseek,
 	.write		= advwdt_write,
 	.unlocked_ioctl	= advwdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= advwdt_open,
 	.release	= advwdt_close,
 };
diff --git a/drivers/watchdog/alim1535_wdt.c b/drivers/watchdog/alim1535_wdt.c
index c157dd3d92a3..42338c7d4540 100644
--- a/drivers/watchdog/alim1535_wdt.c
+++ b/drivers/watchdog/alim1535_wdt.c
@@ -362,6 +362,7 @@ static const struct file_operations ali_fops = {
 	.llseek		=	no_llseek,
 	.write		=	ali_write,
 	.unlocked_ioctl =	ali_ioctl,
+	.compat_ioctl	= 	compat_ptr_ioctl,
 	.open		=	ali_open,
 	.release	=	ali_release,
 };
diff --git a/drivers/watchdog/alim7101_wdt.c b/drivers/watchdog/alim7101_wdt.c
index c8e3ab056767..5af0358f4390 100644
--- a/drivers/watchdog/alim7101_wdt.c
+++ b/drivers/watchdog/alim7101_wdt.c
@@ -294,6 +294,7 @@ static const struct file_operations wdt_fops = {
 	.open		=	fop_open,
 	.release	=	fop_close,
 	.unlocked_ioctl	=	fop_ioctl,
+	.compat_ioctl	= 	compat_ptr_ioctl,
 };
 
 static struct miscdevice wdt_miscdev = {
diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c
index 668a1c704f28..c087027ffd5d 100644
--- a/drivers/watchdog/ar7_wdt.c
+++ b/drivers/watchdog/ar7_wdt.c
@@ -250,6 +250,7 @@ static const struct file_operations ar7_wdt_fops = {
 	.owner		= THIS_MODULE,
 	.write		= ar7_wdt_write,
 	.unlocked_ioctl	= ar7_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= ar7_wdt_open,
 	.release	= ar7_wdt_release,
 	.llseek		= no_llseek,
diff --git a/drivers/watchdog/at91rm9200_wdt.c b/drivers/watchdog/at91rm9200_wdt.c
index 907a4545dee6..6d751eb8191d 100644
--- a/drivers/watchdog/at91rm9200_wdt.c
+++ b/drivers/watchdog/at91rm9200_wdt.c
@@ -213,6 +213,7 @@ static const struct file_operations at91wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.unlocked_ioctl	= at91_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= at91_wdt_open,
 	.release	= at91_wdt_close,
 	.write		= at91_wdt_write,
diff --git a/drivers/watchdog/ath79_wdt.c b/drivers/watchdog/ath79_wdt.c
index 2e09981fe978..9ca8e5117dd8 100644
--- a/drivers/watchdog/ath79_wdt.c
+++ b/drivers/watchdog/ath79_wdt.c
@@ -234,6 +234,7 @@ static const struct file_operations ath79_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= ath79_wdt_write,
 	.unlocked_ioctl	= ath79_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= ath79_wdt_open,
 	.release	= ath79_wdt_release,
 };
diff --git a/drivers/watchdog/bcm63xx_wdt.c b/drivers/watchdog/bcm63xx_wdt.c
index e2af37c9a266..8a043b52aa2f 100644
--- a/drivers/watchdog/bcm63xx_wdt.c
+++ b/drivers/watchdog/bcm63xx_wdt.c
@@ -221,6 +221,7 @@ static const struct file_operations bcm63xx_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= bcm63xx_wdt_write,
 	.unlocked_ioctl	= bcm63xx_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= bcm63xx_wdt_open,
 	.release	= bcm63xx_wdt_release,
 };
diff --git a/drivers/watchdog/cpu5wdt.c b/drivers/watchdog/cpu5wdt.c
index d6d53014cb68..9867a3a936df 100644
--- a/drivers/watchdog/cpu5wdt.c
+++ b/drivers/watchdog/cpu5wdt.c
@@ -187,6 +187,7 @@ static const struct file_operations cpu5wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.unlocked_ioctl	= cpu5wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= cpu5wdt_open,
 	.write		= cpu5wdt_write,
 	.release	= cpu5wdt_release,
diff --git a/drivers/watchdog/eurotechwdt.c b/drivers/watchdog/eurotechwdt.c
index 3a83a48abcae..f5ffa7be066e 100644
--- a/drivers/watchdog/eurotechwdt.c
+++ b/drivers/watchdog/eurotechwdt.c
@@ -371,6 +371,7 @@ static const struct file_operations eurwdt_fops = {
 	.llseek		= no_llseek,
 	.write		= eurwdt_write,
 	.unlocked_ioctl	= eurwdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= eurwdt_open,
 	.release	= eurwdt_release,
 };
diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
index ff5cf1b48a4d..a30ac5b120c9 100644
--- a/drivers/watchdog/f71808e_wdt.c
+++ b/drivers/watchdog/f71808e_wdt.c
@@ -657,6 +657,7 @@ static const struct file_operations watchdog_fops = {
 	.release	= watchdog_release,
 	.write		= watchdog_write,
 	.unlocked_ioctl	= watchdog_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 static struct miscdevice watchdog_miscdev = {
diff --git a/drivers/watchdog/gef_wdt.c b/drivers/watchdog/gef_wdt.c
index 7d5f56994f09..f6541d1b65e3 100644
--- a/drivers/watchdog/gef_wdt.c
+++ b/drivers/watchdog/gef_wdt.c
@@ -248,6 +248,7 @@ static const struct file_operations gef_wdt_fops = {
 	.llseek = no_llseek,
 	.write = gef_wdt_write,
 	.unlocked_ioctl = gef_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open = gef_wdt_open,
 	.release = gef_wdt_release,
 };
diff --git a/drivers/watchdog/geodewdt.c b/drivers/watchdog/geodewdt.c
index 8d105d98908e..9914a4283cb2 100644
--- a/drivers/watchdog/geodewdt.c
+++ b/drivers/watchdog/geodewdt.c
@@ -201,6 +201,7 @@ static const struct file_operations geodewdt_fops = {
 	.llseek         = no_llseek,
 	.write          = geodewdt_write,
 	.unlocked_ioctl = geodewdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open           = geodewdt_open,
 	.release        = geodewdt_release,
 };
diff --git a/drivers/watchdog/ib700wdt.c b/drivers/watchdog/ib700wdt.c
index 92fd7f33bc4d..2b65ea9451d1 100644
--- a/drivers/watchdog/ib700wdt.c
+++ b/drivers/watchdog/ib700wdt.c
@@ -259,6 +259,7 @@ static const struct file_operations ibwdt_fops = {
 	.llseek		= no_llseek,
 	.write		= ibwdt_write,
 	.unlocked_ioctl	= ibwdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= ibwdt_open,
 	.release	= ibwdt_close,
 };
diff --git a/drivers/watchdog/ibmasr.c b/drivers/watchdog/ibmasr.c
index 897f7eda9e6a..4a22fe152086 100644
--- a/drivers/watchdog/ibmasr.c
+++ b/drivers/watchdog/ibmasr.c
@@ -344,6 +344,7 @@ static const struct file_operations asr_fops = {
 	.llseek =		no_llseek,
 	.write =		asr_write,
 	.unlocked_ioctl =	asr_ioctl,
+	.compat_ioctl =		compat_ptr_ioctl,
 	.open =			asr_open,
 	.release =		asr_release,
 };
diff --git a/drivers/watchdog/indydog.c b/drivers/watchdog/indydog.c
index 550358528084..9857bb74a723 100644
--- a/drivers/watchdog/indydog.c
+++ b/drivers/watchdog/indydog.c
@@ -152,6 +152,7 @@ static const struct file_operations indydog_fops = {
 	.llseek		= no_llseek,
 	.write		= indydog_write,
 	.unlocked_ioctl	= indydog_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= indydog_open,
 	.release	= indydog_release,
 };
diff --git a/drivers/watchdog/intel_scu_watchdog.c b/drivers/watchdog/intel_scu_watchdog.c
index 1c85103b750b..6ad5bf3451ec 100644
--- a/drivers/watchdog/intel_scu_watchdog.c
+++ b/drivers/watchdog/intel_scu_watchdog.c
@@ -412,6 +412,7 @@ static const struct file_operations intel_scu_fops = {
 	.llseek         = no_llseek,
 	.write          = intel_scu_write,
 	.unlocked_ioctl = intel_scu_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open           = intel_scu_open,
 	.release        = intel_scu_release,
 };
diff --git a/drivers/watchdog/iop_wdt.c b/drivers/watchdog/iop_wdt.c
index a9ccdb9a9159..6bf68d4750de 100644
--- a/drivers/watchdog/iop_wdt.c
+++ b/drivers/watchdog/iop_wdt.c
@@ -202,6 +202,7 @@ static const struct file_operations iop_wdt_fops = {
 	.llseek = no_llseek,
 	.write = iop_wdt_write,
 	.unlocked_ioctl = iop_wdt_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 	.open = iop_wdt_open,
 	.release = iop_wdt_release,
 };
diff --git a/drivers/watchdog/it8712f_wdt.c b/drivers/watchdog/it8712f_wdt.c
index 2fe1a3c499ed..2fed40d14007 100644
--- a/drivers/watchdog/it8712f_wdt.c
+++ b/drivers/watchdog/it8712f_wdt.c
@@ -345,6 +345,7 @@ static const struct file_operations it8712f_wdt_fops = {
 	.llseek = no_llseek,
 	.write = it8712f_wdt_write,
 	.unlocked_ioctl = it8712f_wdt_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 	.open = it8712f_wdt_open,
 	.release = it8712f_wdt_release,
 };
diff --git a/drivers/watchdog/ixp4xx_wdt.c b/drivers/watchdog/ixp4xx_wdt.c
index 9067998759e3..09886616fd21 100644
--- a/drivers/watchdog/ixp4xx_wdt.c
+++ b/drivers/watchdog/ixp4xx_wdt.c
@@ -163,6 +163,7 @@ static const struct file_operations ixp4xx_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= ixp4xx_wdt_write,
 	.unlocked_ioctl	= ixp4xx_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= ixp4xx_wdt_open,
 	.release	= ixp4xx_wdt_release,
 };
diff --git a/drivers/watchdog/ks8695_wdt.c b/drivers/watchdog/ks8695_wdt.c
index 1550ce3c5702..6f375f302135 100644
--- a/drivers/watchdog/ks8695_wdt.c
+++ b/drivers/watchdog/ks8695_wdt.c
@@ -221,6 +221,7 @@ static const struct file_operations ks8695wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.unlocked_ioctl	= ks8695_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= ks8695_wdt_open,
 	.release	= ks8695_wdt_close,
 	.write		= ks8695_wdt_write,
diff --git a/drivers/watchdog/m54xx_wdt.c b/drivers/watchdog/m54xx_wdt.c
index 752d03620f0a..22f335e1e164 100644
--- a/drivers/watchdog/m54xx_wdt.c
+++ b/drivers/watchdog/m54xx_wdt.c
@@ -183,6 +183,7 @@ static const struct file_operations m54xx_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= m54xx_wdt_write,
 	.unlocked_ioctl	= m54xx_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= m54xx_wdt_open,
 	.release	= m54xx_wdt_release,
 };
diff --git a/drivers/watchdog/machzwd.c b/drivers/watchdog/machzwd.c
index cef2baf59dda..80ff94688487 100644
--- a/drivers/watchdog/machzwd.c
+++ b/drivers/watchdog/machzwd.c
@@ -361,6 +361,7 @@ static const struct file_operations zf_fops = {
 	.llseek		= no_llseek,
 	.write		= zf_write,
 	.unlocked_ioctl = zf_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= zf_open,
 	.release	= zf_close,
 };
diff --git a/drivers/watchdog/mixcomwd.c b/drivers/watchdog/mixcomwd.c
index a86faa5000f1..d387bad377c4 100644
--- a/drivers/watchdog/mixcomwd.c
+++ b/drivers/watchdog/mixcomwd.c
@@ -227,6 +227,7 @@ static const struct file_operations mixcomwd_fops = {
 	.llseek		= no_llseek,
 	.write		= mixcomwd_write,
 	.unlocked_ioctl	= mixcomwd_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= mixcomwd_open,
 	.release	= mixcomwd_release,
 };
diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
index 25a92857b217..8aa1cb4a295f 100644
--- a/drivers/watchdog/mtx-1_wdt.c
+++ b/drivers/watchdog/mtx-1_wdt.c
@@ -181,6 +181,7 @@ static const struct file_operations mtx1_wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.unlocked_ioctl	= mtx1_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= mtx1_wdt_open,
 	.write		= mtx1_wdt_write,
 	.release	= mtx1_wdt_release,
diff --git a/drivers/watchdog/mv64x60_wdt.c b/drivers/watchdog/mv64x60_wdt.c
index 74bf7144a970..0bc72dd69b70 100644
--- a/drivers/watchdog/mv64x60_wdt.c
+++ b/drivers/watchdog/mv64x60_wdt.c
@@ -241,6 +241,7 @@ static const struct file_operations mv64x60_wdt_fops = {
 	.llseek = no_llseek,
 	.write = mv64x60_wdt_write,
 	.unlocked_ioctl = mv64x60_wdt_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 	.open = mv64x60_wdt_open,
 	.release = mv64x60_wdt_release,
 };
diff --git a/drivers/watchdog/nuc900_wdt.c b/drivers/watchdog/nuc900_wdt.c
index db124cebe838..bfe3e4e5d159 100644
--- a/drivers/watchdog/nuc900_wdt.c
+++ b/drivers/watchdog/nuc900_wdt.c
@@ -225,6 +225,7 @@ static const struct file_operations nuc900wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.unlocked_ioctl	= nuc900_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= nuc900_wdt_open,
 	.release	= nuc900_wdt_close,
 	.write		= nuc900_wdt_write,
diff --git a/drivers/watchdog/nv_tco.c b/drivers/watchdog/nv_tco.c
index 5f0082e300bd..d7a560e348d5 100644
--- a/drivers/watchdog/nv_tco.c
+++ b/drivers/watchdog/nv_tco.c
@@ -267,6 +267,7 @@ static const struct file_operations nv_tco_fops = {
 	.llseek =		no_llseek,
 	.write =		nv_tco_write,
 	.unlocked_ioctl =	nv_tco_ioctl,
+	.compat_ioctl =		compat_ptr_ioctl,
 	.open =			nv_tco_open,
 	.release =		nv_tco_release,
 };
diff --git a/drivers/watchdog/pc87413_wdt.c b/drivers/watchdog/pc87413_wdt.c
index 2af1a8b3f973..73fbfc99083b 100644
--- a/drivers/watchdog/pc87413_wdt.c
+++ b/drivers/watchdog/pc87413_wdt.c
@@ -473,6 +473,7 @@ static const struct file_operations pc87413_fops = {
 	.llseek		= no_llseek,
 	.write		= pc87413_write,
 	.unlocked_ioctl	= pc87413_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= pc87413_open,
 	.release	= pc87413_release,
 };
diff --git a/drivers/watchdog/pcwd.c b/drivers/watchdog/pcwd.c
index c3c93e00b320..7a0587fdc52c 100644
--- a/drivers/watchdog/pcwd.c
+++ b/drivers/watchdog/pcwd.c
@@ -752,6 +752,7 @@ static const struct file_operations pcwd_fops = {
 	.llseek		= no_llseek,
 	.write		= pcwd_write,
 	.unlocked_ioctl	= pcwd_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= pcwd_open,
 	.release	= pcwd_close,
 };
diff --git a/drivers/watchdog/pcwd_pci.c b/drivers/watchdog/pcwd_pci.c
index e30c1f762045..81508a42a90c 100644
--- a/drivers/watchdog/pcwd_pci.c
+++ b/drivers/watchdog/pcwd_pci.c
@@ -646,6 +646,7 @@ static const struct file_operations pcipcwd_fops = {
 	.llseek =	no_llseek,
 	.write =	pcipcwd_write,
 	.unlocked_ioctl = pcipcwd_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 	.open =		pcipcwd_open,
 	.release =	pcipcwd_release,
 };
diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c
index 6727f8ab2d18..2f44af1831d0 100644
--- a/drivers/watchdog/pcwd_usb.c
+++ b/drivers/watchdog/pcwd_usb.c
@@ -550,6 +550,7 @@ static const struct file_operations usb_pcwd_fops = {
 	.llseek =	no_llseek,
 	.write =	usb_pcwd_write,
 	.unlocked_ioctl = usb_pcwd_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 	.open =		usb_pcwd_open,
 	.release =	usb_pcwd_release,
 };
diff --git a/drivers/watchdog/pika_wdt.c b/drivers/watchdog/pika_wdt.c
index 205c3c68fca1..a98abd0d3146 100644
--- a/drivers/watchdog/pika_wdt.c
+++ b/drivers/watchdog/pika_wdt.c
@@ -214,6 +214,7 @@ static const struct file_operations pikawdt_fops = {
 	.release	= pikawdt_release,
 	.write		= pikawdt_write,
 	.unlocked_ioctl	= pikawdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 static struct miscdevice pikawdt_miscdev = {
diff --git a/drivers/watchdog/pnx833x_wdt.c b/drivers/watchdog/pnx833x_wdt.c
index aa53babf2bab..4097d076aab8 100644
--- a/drivers/watchdog/pnx833x_wdt.c
+++ b/drivers/watchdog/pnx833x_wdt.c
@@ -215,6 +215,7 @@ static const struct file_operations pnx833x_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= pnx833x_wdt_write,
 	.unlocked_ioctl	= pnx833x_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= pnx833x_wdt_open,
 	.release	= pnx833x_wdt_release,
 };
diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c
index a8a4b3a41a90..1dfede0abf18 100644
--- a/drivers/watchdog/rc32434_wdt.c
+++ b/drivers/watchdog/rc32434_wdt.c
@@ -245,6 +245,7 @@ static const struct file_operations rc32434_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= rc32434_wdt_write,
 	.unlocked_ioctl	= rc32434_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= rc32434_wdt_open,
 	.release	= rc32434_wdt_release,
 };
diff --git a/drivers/watchdog/rdc321x_wdt.c b/drivers/watchdog/rdc321x_wdt.c
index 2e608ae6cbc7..57187efeb86f 100644
--- a/drivers/watchdog/rdc321x_wdt.c
+++ b/drivers/watchdog/rdc321x_wdt.c
@@ -199,6 +199,7 @@ static const struct file_operations rdc321x_wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.unlocked_ioctl	= rdc321x_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= rdc321x_wdt_open,
 	.write		= rdc321x_wdt_write,
 	.release	= rdc321x_wdt_release,
diff --git a/drivers/watchdog/riowd.c b/drivers/watchdog/riowd.c
index b35f7be20c00..dc3c06a92f93 100644
--- a/drivers/watchdog/riowd.c
+++ b/drivers/watchdog/riowd.c
@@ -163,6 +163,7 @@ static const struct file_operations riowd_fops = {
 	.owner =		THIS_MODULE,
 	.llseek =		no_llseek,
 	.unlocked_ioctl =	riowd_ioctl,
+	.compat_ioctl	=	compat_ptr_ioctl,
 	.open =			riowd_open,
 	.write =		riowd_write,
 	.release =		riowd_release,
diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c
index cbd8c957182f..9b93be00109f 100644
--- a/drivers/watchdog/sa1100_wdt.c
+++ b/drivers/watchdog/sa1100_wdt.c
@@ -141,6 +141,7 @@ static const struct file_operations sa1100dog_fops = {
 	.llseek		= no_llseek,
 	.write		= sa1100dog_write,
 	.unlocked_ioctl	= sa1100dog_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= sa1100dog_open,
 	.release	= sa1100dog_release,
 };
diff --git a/drivers/watchdog/sb_wdog.c b/drivers/watchdog/sb_wdog.c
index 202fc8d8ca5f..da2dad00d473 100644
--- a/drivers/watchdog/sb_wdog.c
+++ b/drivers/watchdog/sb_wdog.c
@@ -237,6 +237,7 @@ static const struct file_operations sbwdog_fops = {
 	.llseek		= no_llseek,
 	.write		= sbwdog_write,
 	.unlocked_ioctl	= sbwdog_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= sbwdog_open,
 	.release	= sbwdog_release,
 };
diff --git a/drivers/watchdog/sbc60xxwdt.c b/drivers/watchdog/sbc60xxwdt.c
index c3151642694c..f2cbe6d880a8 100644
--- a/drivers/watchdog/sbc60xxwdt.c
+++ b/drivers/watchdog/sbc60xxwdt.c
@@ -280,6 +280,7 @@ static const struct file_operations wdt_fops = {
 	.open		= fop_open,
 	.release	= fop_close,
 	.unlocked_ioctl	= fop_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 static struct miscdevice wdt_miscdev = {
diff --git a/drivers/watchdog/sbc7240_wdt.c b/drivers/watchdog/sbc7240_wdt.c
index 12cdee7d5069..0bf583b76e6b 100644
--- a/drivers/watchdog/sbc7240_wdt.c
+++ b/drivers/watchdog/sbc7240_wdt.c
@@ -211,6 +211,7 @@ static const struct file_operations wdt_fops = {
 	.open = fop_open,
 	.release = fop_close,
 	.unlocked_ioctl = fop_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 };
 
 static struct miscdevice wdt_miscdev = {
diff --git a/drivers/watchdog/sbc_epx_c3.c b/drivers/watchdog/sbc_epx_c3.c
index 86828c28843f..5e3a9ddb952e 100644
--- a/drivers/watchdog/sbc_epx_c3.c
+++ b/drivers/watchdog/sbc_epx_c3.c
@@ -156,6 +156,7 @@ static const struct file_operations epx_c3_fops = {
 	.llseek		= no_llseek,
 	.write		= epx_c3_write,
 	.unlocked_ioctl	= epx_c3_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= epx_c3_open,
 	.release	= epx_c3_release,
 };
diff --git a/drivers/watchdog/sbc_fitpc2_wdt.c b/drivers/watchdog/sbc_fitpc2_wdt.c
index 3822a60a8d2b..1b20b33879c4 100644
--- a/drivers/watchdog/sbc_fitpc2_wdt.c
+++ b/drivers/watchdog/sbc_fitpc2_wdt.c
@@ -186,6 +186,7 @@ static const struct file_operations fitpc2_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= fitpc2_wdt_write,
 	.unlocked_ioctl	= fitpc2_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= fitpc2_wdt_open,
 	.release	= fitpc2_wdt_release,
 };
diff --git a/drivers/watchdog/sc1200wdt.c b/drivers/watchdog/sc1200wdt.c
index 960385a766b3..9673eb12dacd 100644
--- a/drivers/watchdog/sc1200wdt.c
+++ b/drivers/watchdog/sc1200wdt.c
@@ -307,6 +307,7 @@ static const struct file_operations sc1200wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= sc1200wdt_write,
 	.unlocked_ioctl = sc1200wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= sc1200wdt_open,
 	.release	= sc1200wdt_release,
 };
diff --git a/drivers/watchdog/sc520_wdt.c b/drivers/watchdog/sc520_wdt.c
index a612128c5f80..fbe79bcc9297 100644
--- a/drivers/watchdog/sc520_wdt.c
+++ b/drivers/watchdog/sc520_wdt.c
@@ -336,6 +336,7 @@ static const struct file_operations wdt_fops = {
 	.open		= fop_open,
 	.release	= fop_close,
 	.unlocked_ioctl	= fop_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 static struct miscdevice wdt_miscdev = {
diff --git a/drivers/watchdog/sch311x_wdt.c b/drivers/watchdog/sch311x_wdt.c
index 3612f1df381b..83949a385f62 100644
--- a/drivers/watchdog/sch311x_wdt.c
+++ b/drivers/watchdog/sch311x_wdt.c
@@ -337,6 +337,7 @@ static const struct file_operations sch311x_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= sch311x_wdt_write,
 	.unlocked_ioctl	= sch311x_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= sch311x_wdt_open,
 	.release	= sch311x_wdt_close,
 };
diff --git a/drivers/watchdog/scx200_wdt.c b/drivers/watchdog/scx200_wdt.c
index 46268309ee9b..c94098acb78f 100644
--- a/drivers/watchdog/scx200_wdt.c
+++ b/drivers/watchdog/scx200_wdt.c
@@ -201,6 +201,7 @@ static const struct file_operations scx200_wdt_fops = {
 	.llseek = no_llseek,
 	.write = scx200_wdt_write,
 	.unlocked_ioctl = scx200_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open = scx200_wdt_open,
 	.release = scx200_wdt_release,
 };
diff --git a/drivers/watchdog/smsc37b787_wdt.c b/drivers/watchdog/smsc37b787_wdt.c
index f5713030d0f7..43de56acd767 100644
--- a/drivers/watchdog/smsc37b787_wdt.c
+++ b/drivers/watchdog/smsc37b787_wdt.c
@@ -505,6 +505,7 @@ static const struct file_operations wb_smsc_wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= wb_smsc_wdt_write,
 	.unlocked_ioctl	= wb_smsc_wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= wb_smsc_wdt_open,
 	.release	= wb_smsc_wdt_release,
 };
diff --git a/drivers/watchdog/w83877f_wdt.c b/drivers/watchdog/w83877f_wdt.c
index 6eb5185d6ea6..6b3b667e6f23 100644
--- a/drivers/watchdog/w83877f_wdt.c
+++ b/drivers/watchdog/w83877f_wdt.c
@@ -304,6 +304,7 @@ static const struct file_operations wdt_fops = {
 	.open		= fop_open,
 	.release	= fop_close,
 	.unlocked_ioctl	= fop_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 static struct miscdevice wdt_miscdev = {
diff --git a/drivers/watchdog/w83977f_wdt.c b/drivers/watchdog/w83977f_wdt.c
index 16e9cbe72acc..5212e68c6b01 100644
--- a/drivers/watchdog/w83977f_wdt.c
+++ b/drivers/watchdog/w83977f_wdt.c
@@ -446,6 +446,7 @@ static const struct file_operations wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= wdt_write,
 	.unlocked_ioctl	= wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= wdt_open,
 	.release	= wdt_release,
 };
diff --git a/drivers/watchdog/wafer5823wdt.c b/drivers/watchdog/wafer5823wdt.c
index 6d2071a0590d..a6925847f76f 100644
--- a/drivers/watchdog/wafer5823wdt.c
+++ b/drivers/watchdog/wafer5823wdt.c
@@ -230,6 +230,7 @@ static const struct file_operations wafwdt_fops = {
 	.llseek		= no_llseek,
 	.write		= wafwdt_write,
 	.unlocked_ioctl	= wafwdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= wafwdt_open,
 	.release	= wafwdt_close,
 };
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index dbd2ad4c9294..3858094ca6ba 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -933,6 +933,7 @@ static const struct file_operations watchdog_fops = {
 	.owner		= THIS_MODULE,
 	.write		= watchdog_write,
 	.unlocked_ioctl	= watchdog_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= watchdog_open,
 	.release	= watchdog_release,
 };
diff --git a/drivers/watchdog/wdrtas.c b/drivers/watchdog/wdrtas.c
index 6ad7edb4a712..184a06a74f83 100644
--- a/drivers/watchdog/wdrtas.c
+++ b/drivers/watchdog/wdrtas.c
@@ -472,6 +472,7 @@ static const struct file_operations wdrtas_fops = {
 	.llseek		= no_llseek,
 	.write		= wdrtas_write,
 	.unlocked_ioctl	= wdrtas_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= wdrtas_open,
 	.release	= wdrtas_close,
 };
diff --git a/drivers/watchdog/wdt.c b/drivers/watchdog/wdt.c
index 7d278b37e083..f9054cb0f8e2 100644
--- a/drivers/watchdog/wdt.c
+++ b/drivers/watchdog/wdt.c
@@ -523,6 +523,7 @@ static const struct file_operations wdt_fops = {
 	.llseek		= no_llseek,
 	.write		= wdt_write,
 	.unlocked_ioctl	= wdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= wdt_open,
 	.release	= wdt_release,
 };
diff --git a/drivers/watchdog/wdt285.c b/drivers/watchdog/wdt285.c
index 4eacfb1ce1ac..4ec0580da76d 100644
--- a/drivers/watchdog/wdt285.c
+++ b/drivers/watchdog/wdt285.c
@@ -181,6 +181,7 @@ static const struct file_operations watchdog_fops = {
 	.llseek		= no_llseek,
 	.write		= watchdog_write,
 	.unlocked_ioctl	= watchdog_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= watchdog_open,
 	.release	= watchdog_release,
 };
diff --git a/drivers/watchdog/wdt977.c b/drivers/watchdog/wdt977.c
index 5c52c73e1839..066a4fb4d75b 100644
--- a/drivers/watchdog/wdt977.c
+++ b/drivers/watchdog/wdt977.c
@@ -422,6 +422,7 @@ static const struct file_operations wdt977_fops = {
 	.llseek		= no_llseek,
 	.write		= wdt977_write,
 	.unlocked_ioctl	= wdt977_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= wdt977_open,
 	.release	= wdt977_release,
 };
diff --git a/drivers/watchdog/wdt_pci.c b/drivers/watchdog/wdt_pci.c
index 66303ab95685..e528024faa41 100644
--- a/drivers/watchdog/wdt_pci.c
+++ b/drivers/watchdog/wdt_pci.c
@@ -566,6 +566,7 @@ static const struct file_operations wdtpci_fops = {
 	.llseek		= no_llseek,
 	.write		= wdtpci_write,
 	.unlocked_ioctl	= wdtpci_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= wdtpci_open,
 	.release	= wdtpci_release,
 };
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index b20228c19ccd..10ba2d9e20bc 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -412,17 +412,6 @@ COMPATIBLE_IOCTL(PPPIOCDISCONN)
 COMPATIBLE_IOCTL(PPPIOCATTCHAN)
 COMPATIBLE_IOCTL(PPPIOCGCHAN)
 COMPATIBLE_IOCTL(PPPIOCGL2TPSTATS)
-/* Watchdog */
-COMPATIBLE_IOCTL(WDIOC_GETSUPPORT)
-COMPATIBLE_IOCTL(WDIOC_GETSTATUS)
-COMPATIBLE_IOCTL(WDIOC_GETBOOTSTATUS)
-COMPATIBLE_IOCTL(WDIOC_GETTEMP)
-COMPATIBLE_IOCTL(WDIOC_SETOPTIONS)
-COMPATIBLE_IOCTL(WDIOC_KEEPALIVE)
-COMPATIBLE_IOCTL(WDIOC_SETTIMEOUT)
-COMPATIBLE_IOCTL(WDIOC_GETTIMEOUT)
-COMPATIBLE_IOCTL(WDIOC_SETPRETIMEOUT)
-COMPATIBLE_IOCTL(WDIOC_GETPRETIMEOUT)
 };
 
 /*
-- 
2.20.0

[PATCH v5 07/18] compat_ioctl: reimplement SG_IO handling

[Arnd Bergmann]

There are two code locations that implement the SG_IO ioctl: the old
sg.c driver, and the generic scsi_ioctl helper that is in turn used by
multiple drivers.

To eradicate the old compat_ioctl conversion handler for the SG_IO
command, I implement a readable pair of put_sg_io_hdr() /get_sg_io_hdr()
helper functions that can be used for both compat and native mode,
and then I call this from both drivers.

For the iovec handling, there is already a compat_import_iovec() function
that can simply be called in place of import_iovec().

To avoid having to pass the compat/native state through multiple
indirections, I mark the SG_IO command itself as compatible in
fs/compat_ioctl.c and use in_compat_syscall() to figure out where
we are called from.

As a side-effect of this, the sg.c driver now also accepts the 32-bit
sg_io_hdr format in compat mode using the read/write interface, not
just ioctl. This should improve compatiblity with old 32-bit binaries,
but it would break if any application intentionally passes the 64-bit
data structure in compat mode here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 block/scsi_ioctl.c     | 132 ++++++++++++++++++++++++++++++++++--
 drivers/scsi/sg.c      |  19 +++---
 fs/compat_ioctl.c      | 148 +----------------------------------------
 include/linux/blkdev.h |   2 +
 lib/iov_iter.c         |   1 +
 5 files changed, 143 insertions(+), 159 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index f5e0ad65e86a..cbeb629ee917 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -2,6 +2,7 @@
 /*
  * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
  */
+#include <linux/compat.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
@@ -327,7 +328,14 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 		struct iov_iter i;
 		struct iovec *iov = NULL;
 
-		ret = import_iovec(rq_data_dir(rq),
+#ifdef CONFIG_COMPAT
+		if (in_compat_syscall())
+			ret = compat_import_iovec(rq_data_dir(rq),
+				   hdr->dxferp, hdr->iovec_count,
+				   0, &iov, &i);
+		else
+#endif
+			ret = import_iovec(rq_data_dir(rq),
 				   hdr->dxferp, hdr->iovec_count,
 				   0, &iov, &i);
 		if (ret < 0)
@@ -542,6 +550,122 @@ static inline int blk_send_start_stop(struct request_queue *q,
 	return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 }
 
+#ifdef CONFIG_COMPAT
+struct compat_sg_io_hdr {
+	compat_int_t interface_id;	/* [i] 'S' for SCSI generic (required) */
+	compat_int_t dxfer_direction;	/* [i] data transfer direction  */
+	unsigned char cmd_len;		/* [i] SCSI command length ( <= 16 bytes) */
+	unsigned char mx_sb_len;	/* [i] max length to write to sbp */
+	unsigned short iovec_count;	/* [i] 0 implies no scatter gather */
+	compat_uint_t dxfer_len;	/* [i] byte count of data transfer */
+	compat_uint_t dxferp;		/* [i], [*io] points to data transfer memory
+						or scatter gather list */
+	compat_uptr_t cmdp;		/* [i], [*i] points to command to perform */
+	compat_uptr_t sbp;		/* [i], [*o] points to sense_buffer memory */
+	compat_uint_t timeout;		/* [i] MAX_UINT->no timeout (unit: millisec) */
+	compat_uint_t flags;		/* [i] 0 -> default, see SG_FLAG... */
+	compat_int_t pack_id;		/* [i->o] unused internally (normally) */
+	compat_uptr_t usr_ptr;		/* [i->o] unused internally */
+	unsigned char status;		/* [o] scsi status */
+	unsigned char masked_status;	/* [o] shifted, masked scsi status */
+	unsigned char msg_status;	/* [o] messaging level data (optional) */
+	unsigned char sb_len_wr;	/* [o] byte count actually written to sbp */
+	unsigned short host_status;	/* [o] errors from host adapter */
+	unsigned short driver_status;	/* [o] errors from software driver */
+	compat_int_t resid;		/* [o] dxfer_len - actual_transferred */
+	compat_uint_t duration;		/* [o] time taken by cmd (unit: millisec) */
+	compat_uint_t info;		/* [o] auxiliary information */
+};
+#endif
+
+int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
+{
+#ifdef CONFIG_COMPAT
+	if (in_compat_syscall()) {
+		struct compat_sg_io_hdr hdr32 =  {
+			.interface_id	 = hdr->interface_id,
+			.dxfer_direction = hdr->dxfer_direction,
+			.cmd_len	 = hdr->cmd_len,
+			.mx_sb_len	 = hdr->mx_sb_len,
+			.iovec_count	 = hdr->iovec_count,
+			.dxfer_len	 = hdr->dxfer_len,
+			.dxferp		 = (uintptr_t)hdr->dxferp,
+			.cmdp		 = (uintptr_t)hdr->cmdp,
+			.sbp		 = (uintptr_t)hdr->sbp,
+			.timeout	 = hdr->timeout,
+			.flags		 = hdr->flags,
+			.pack_id	 = hdr->pack_id,
+			.usr_ptr	 = (uintptr_t)hdr->usr_ptr,
+			.status		 = hdr->status,
+			.masked_status	 = hdr->masked_status,
+			.msg_status	 = hdr->msg_status,
+			.sb_len_wr	 = hdr->sb_len_wr,
+			.host_status	 = hdr->host_status,
+			.driver_status	 = hdr->driver_status,
+			.resid		 = hdr->resid,
+			.duration	 = hdr->duration,
+			.info		 = hdr->info,
+		};
+
+		if (copy_to_user(argp, &hdr32, sizeof(hdr)))
+			return -EFAULT;
+
+		return 0;
+	}
+#endif
+
+	if (copy_to_user(argp, &hdr, sizeof(hdr)))
+		return -EFAULT;
+
+	return 0;
+}
+EXPORT_SYMBOL(put_sg_io_hdr);
+
+int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
+{
+#ifdef CONFIG_COMPAT
+	struct compat_sg_io_hdr hdr32;
+
+	if (in_compat_syscall()) {
+		if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
+			return -EFAULT;
+
+		*hdr = (struct sg_io_hdr) {
+			.interface_id	 = hdr32.interface_id,
+			.dxfer_direction = hdr32.dxfer_direction,
+			.cmd_len	 = hdr32.cmd_len,
+			.mx_sb_len	 = hdr32.mx_sb_len,
+			.iovec_count	 = hdr32.iovec_count,
+			.dxfer_len	 = hdr32.dxfer_len,
+			.dxferp		 = compat_ptr(hdr32.dxferp),
+			.cmdp		 = compat_ptr(hdr32.cmdp),
+			.sbp		 = compat_ptr(hdr32.sbp),
+			.timeout	 = hdr32.timeout,
+			.flags		 = hdr32.flags,
+			.pack_id	 = hdr32.pack_id,
+			.usr_ptr	 = compat_ptr(hdr32.usr_ptr),
+			.status		 = hdr32.status,
+			.masked_status	 = hdr32.masked_status,
+			.msg_status	 = hdr32.msg_status,
+			.sb_len_wr	 = hdr32.sb_len_wr,
+			.host_status	 = hdr32.host_status,
+			.driver_status	 = hdr32.driver_status,
+			.resid		 = hdr32.resid,
+			.duration	 = hdr32.duration,
+			.info		 = hdr32.info,
+		};
+
+		return 0;
+	}
+#endif
+
+	if (copy_from_user(&hdr, argp, sizeof(hdr)))
+		return -EFAULT;
+
+	return 0;
+}
+EXPORT_SYMBOL(get_sg_io_hdr);
+
 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 		   unsigned int cmd, void __user *arg)
 {
@@ -581,14 +705,14 @@ int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mod
 		case SG_IO: {
 			struct sg_io_hdr hdr;
 
-			err = -EFAULT;
-			if (copy_from_user(&hdr, arg, sizeof(hdr)))
+			err = get_sg_io_hdr(&hdr, arg);
+			if (err)
 				break;
 			err = sg_io(q, bd_disk, &hdr, mode);
 			if (err == -EFAULT)
 				break;
 
-			if (copy_to_user(arg, &hdr, sizeof(hdr)))
+			if (put_sg_io_hdr(&hdr, arg))
 				err = -EFAULT;
 			break;
 		}
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index cce757506383..8ae096af2667 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -447,8 +447,7 @@ sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
 					retval = -ENOMEM;
 					goto free_old_hdr;
 				}
-				retval =__copy_from_user
-				    (new_hdr, buf, SZ_SG_IO_HDR);
+				retval = get_sg_io_hdr(new_hdr, buf);
 				req_pack_id = new_hdr->pack_id;
 				kfree(new_hdr);
 				if (retval) {
@@ -589,10 +588,7 @@ sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
 	}
 	if (hp->masked_status || hp->host_status || hp->driver_status)
 		hp->info |= SG_INFO_CHECK;
-	if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
-		err = -EFAULT;
-		goto err_out;
-	}
+	err = put_sg_io_hdr(hp, buf);
 err_out:
 	err2 = sg_finish_rem_req(srp);
 	sg_remove_request(sfp, srp);
@@ -735,7 +731,7 @@ sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
 	}
 	srp->sg_io_owned = sg_io_owned;
 	hp = &srp->header;
-	if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
+	if (get_sg_io_hdr(hp, buf)) {
 		sg_remove_request(sfp, srp);
 		return -EFAULT;
 	}
@@ -1797,7 +1793,14 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
 		struct iovec *iov = NULL;
 		struct iov_iter i;
 
-		res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
+#ifdef CONFIG_COMPAT
+		if (in_compat_syscall())
+			res = compat_import_iovec(rw, hp->dxferp, iov_count,
+						  0, &iov, &i);
+		else
+#endif
+			res = import_iovec(rw, hp->dxferp, iov_count,
+					   0, &iov, &i);
 		if (res < 0)
 			return res;
 
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 10ba2d9e20bc..f279e77df256 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -64,151 +64,6 @@ static int do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 }
 
 #ifdef CONFIG_BLOCK
-typedef struct sg_io_hdr32 {
-	compat_int_t interface_id;	/* [i] 'S' for SCSI generic (required) */
-	compat_int_t dxfer_direction;	/* [i] data transfer direction  */
-	unsigned char cmd_len;		/* [i] SCSI command length ( <= 16 bytes) */
-	unsigned char mx_sb_len;		/* [i] max length to write to sbp */
-	unsigned short iovec_count;	/* [i] 0 implies no scatter gather */
-	compat_uint_t dxfer_len;		/* [i] byte count of data transfer */
-	compat_uint_t dxferp;		/* [i], [*io] points to data transfer memory
-					      or scatter gather list */
-	compat_uptr_t cmdp;		/* [i], [*i] points to command to perform */
-	compat_uptr_t sbp;		/* [i], [*o] points to sense_buffer memory */
-	compat_uint_t timeout;		/* [i] MAX_UINT->no timeout (unit: millisec) */
-	compat_uint_t flags;		/* [i] 0 -> default, see SG_FLAG... */
-	compat_int_t pack_id;		/* [i->o] unused internally (normally) */
-	compat_uptr_t usr_ptr;		/* [i->o] unused internally */
-	unsigned char status;		/* [o] scsi status */
-	unsigned char masked_status;	/* [o] shifted, masked scsi status */
-	unsigned char msg_status;		/* [o] messaging level data (optional) */
-	unsigned char sb_len_wr;		/* [o] byte count actually written to sbp */
-	unsigned short host_status;	/* [o] errors from host adapter */
-	unsigned short driver_status;	/* [o] errors from software driver */
-	compat_int_t resid;		/* [o] dxfer_len - actual_transferred */
-	compat_uint_t duration;		/* [o] time taken by cmd (unit: millisec) */
-	compat_uint_t info;		/* [o] auxiliary information */
-} sg_io_hdr32_t;  /* 64 bytes long (on sparc32) */
-
-typedef struct sg_iovec32 {
-	compat_uint_t iov_base;
-	compat_uint_t iov_len;
-} sg_iovec32_t;
-
-static int sg_build_iovec(sg_io_hdr_t __user *sgio, void __user *dxferp, u16 iovec_count)
-{
-	sg_iovec_t __user *iov = (sg_iovec_t __user *) (sgio + 1);
-	sg_iovec32_t __user *iov32 = dxferp;
-	int i;
-
-	for (i = 0; i < iovec_count; i++) {
-		u32 base, len;
-
-		if (get_user(base, &iov32[i].iov_base) ||
-		    get_user(len, &iov32[i].iov_len) ||
-		    put_user(compat_ptr(base), &iov[i].iov_base) ||
-		    put_user(len, &iov[i].iov_len))
-			return -EFAULT;
-	}
-
-	if (put_user(iov, &sgio->dxferp))
-		return -EFAULT;
-	return 0;
-}
-
-static int sg_ioctl_trans(struct file *file, unsigned int cmd,
-			sg_io_hdr32_t __user *sgio32)
-{
-	sg_io_hdr_t __user *sgio;
-	u16 iovec_count;
-	u32 data;
-	void __user *dxferp;
-	int err;
-	int interface_id;
-
-	if (get_user(interface_id, &sgio32->interface_id))
-		return -EFAULT;
-	if (interface_id != 'S')
-		return do_ioctl(file, cmd, (unsigned long)sgio32);
-
-	if (get_user(iovec_count, &sgio32->iovec_count))
-		return -EFAULT;
-
-	{
-		void __user *top = compat_alloc_user_space(0);
-		void __user *new = compat_alloc_user_space(sizeof(sg_io_hdr_t) +
-				       (iovec_count * sizeof(sg_iovec_t)));
-		if (new > top)
-			return -EINVAL;
-
-		sgio = new;
-	}
-
-	/* Ok, now construct.  */
-	if (copy_in_user(&sgio->interface_id, &sgio32->interface_id,
-			 (2 * sizeof(int)) +
-			 (2 * sizeof(unsigned char)) +
-			 (1 * sizeof(unsigned short)) +
-			 (1 * sizeof(unsigned int))))
-		return -EFAULT;
-
-	if (get_user(data, &sgio32->dxferp))
-		return -EFAULT;
-	dxferp = compat_ptr(data);
-	if (iovec_count) {
-		if (sg_build_iovec(sgio, dxferp, iovec_count))
-			return -EFAULT;
-	} else {
-		if (put_user(dxferp, &sgio->dxferp))
-			return -EFAULT;
-	}
-
-	{
-		unsigned char __user *cmdp;
-		unsigned char __user *sbp;
-
-		if (get_user(data, &sgio32->cmdp))
-			return -EFAULT;
-		cmdp = compat_ptr(data);
-
-		if (get_user(data, &sgio32->sbp))
-			return -EFAULT;
-		sbp = compat_ptr(data);
-
-		if (put_user(cmdp, &sgio->cmdp) ||
-		    put_user(sbp, &sgio->sbp))
-			return -EFAULT;
-	}
-
-	if (copy_in_user(&sgio->timeout, &sgio32->timeout,
-			 3 * sizeof(int)))
-		return -EFAULT;
-
-	if (get_user(data, &sgio32->usr_ptr))
-		return -EFAULT;
-	if (put_user(compat_ptr(data), &sgio->usr_ptr))
-		return -EFAULT;
-
-	err = do_ioctl(file, cmd, (unsigned long) sgio);
-
-	if (err >= 0) {
-		void __user *datap;
-
-		if (copy_in_user(&sgio32->pack_id, &sgio->pack_id,
-				 sizeof(int)) ||
-		    get_user(datap, &sgio->usr_ptr) ||
-		    put_user((u32)(unsigned long)datap,
-			     &sgio32->usr_ptr) ||
-		    copy_in_user(&sgio32->status, &sgio->status,
-				 (4 * sizeof(unsigned char)) +
-				 (2 * sizeof(unsigned short)) +
-				 (3 * sizeof(int))))
-			err = -EFAULT;
-	}
-
-	return err;
-}
-
 struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
 	char req_state;
 	char orphan;
@@ -358,6 +213,7 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
 #endif
 #ifdef CONFIG_BLOCK
 /* SG stuff */
+COMPATIBLE_IOCTL(SG_IO)
 COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
 COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
 COMPATIBLE_IOCTL(SG_EMULATED_HOST)
@@ -435,8 +291,6 @@ static long do_ioctl_trans(unsigned int cmd,
 	case PPPIOCSACTIVE32:
 		return ppp_sock_fprog_ioctl_trans(file, cmd, argp);
 #ifdef CONFIG_BLOCK
-	case SG_IO:
-		return sg_ioctl_trans(file, cmd, argp);
 	case SG_GET_REQUEST_TABLE:
 		return sg_grt_trans(file, cmd, argp);
 #endif
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1ef375dafb1c..a1050710d846 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -853,6 +853,8 @@ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
 			  unsigned int, void __user *);
 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
 			 struct scsi_ioctl_command __user *);
+extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
+extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);
 
 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
 extern void blk_queue_exit(struct request_queue *q);
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index f1e0569b4539..7baaa989404b 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1678,6 +1678,7 @@ ssize_t compat_import_iovec(int type,
 	*iov = p == *iov ? NULL : p;
 	return n;
 }
+EXPORT_SYMBOL(compat_import_iovec);
 #endif
 
 int import_single_range(int rw, void __user *buf, size_t len,
-- 
2.20.0

[PATCH v5 08/18] af_unix: add compat_ioctl support

[Arnd Bergmann]

The af_unix protocol family has a custom ioctl command (inexplicibly
based on SIOCPROTOPRIVATE), but never had a compat_ioctl handler for
32-bit applications.

Since all commands are compatible here, add a trivial wrapper that
performs the compat_ptr() conversion for SIOCOUTQ/SIOCINQ.  SIOCUNIXFILE
does not use the argument, but it doesn't hurt to also use compat_ptr()
here.

Fixes: ba94f3088b79 ("unix: add ioctl to open a unix socket file with O_PATH")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 net/unix/af_unix.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 67e87db5877f..e18ca6d9f3d4 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -646,6 +646,9 @@ static __poll_t unix_poll(struct file *, struct socket *, poll_table *);
 static __poll_t unix_dgram_poll(struct file *, struct socket *,
 				    poll_table *);
 static int unix_ioctl(struct socket *, unsigned int, unsigned long);
+#ifdef CONFIG_COMPAT
+static int unix_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
+#endif
 static int unix_shutdown(struct socket *, int);
 static int unix_stream_sendmsg(struct socket *, struct msghdr *, size_t);
 static int unix_stream_recvmsg(struct socket *, struct msghdr *, size_t, int);
@@ -687,6 +690,9 @@ static const struct proto_ops unix_stream_ops = {
 	.getname =	unix_getname,
 	.poll =		unix_poll,
 	.ioctl =	unix_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	unix_compat_ioctl,
+#endif
 	.listen =	unix_listen,
 	.shutdown =	unix_shutdown,
 	.setsockopt =	sock_no_setsockopt,
@@ -710,6 +716,9 @@ static const struct proto_ops unix_dgram_ops = {
 	.getname =	unix_getname,
 	.poll =		unix_dgram_poll,
 	.ioctl =	unix_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	unix_compat_ioctl,
+#endif
 	.listen =	sock_no_listen,
 	.shutdown =	unix_shutdown,
 	.setsockopt =	sock_no_setsockopt,
@@ -732,6 +741,9 @@ static const struct proto_ops unix_seqpacket_ops = {
 	.getname =	unix_getname,
 	.poll =		unix_dgram_poll,
 	.ioctl =	unix_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	unix_compat_ioctl,
+#endif
 	.listen =	unix_listen,
 	.shutdown =	unix_shutdown,
 	.setsockopt =	sock_no_setsockopt,
@@ -2582,6 +2594,13 @@ static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	return err;
 }
 
+#ifdef CONFIG_COMPAT
+static int unix_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	return unix_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static __poll_t unix_poll(struct file *file, struct socket *sock, poll_table *wait)
 {
 	struct sock *sk = sock->sk;
-- 
2.20.0

[PATCH v5 09/18] compat_ioctl: handle SIOCOUTQNSD

[Arnd Bergmann]

Unlike the normal SIOCOUTQ, SIOCOUTQNSD was never handled in compat
mode. Add it to the common socket compat handler along with similar
ones.

Fixes: 2f4e1b397097 ("tcp: ioctl type SIOCOUTQNSD returns amount of data not sent")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 net/socket.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/socket.c b/net/socket.c
index 6a9ab7a8b1d2..a60f48ab2130 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3452,6 +3452,7 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 	case SIOCSARP:
 	case SIOCGARP:
 	case SIOCDARP:
+	case SIOCOUTQNSD:
 	case SIOCATMARK:
 		return sock_do_ioctl(net, sock, cmd, arg);
 	}
-- 
2.20.0

[PATCH v5 10/18] compat_ioctl: move SIOCOUTQ out of compat_ioctl.c

[Arnd Bergmann]

All users of this call are in socket or tty code, so handling
it there means we can avoid the table entry in fs/compat_ioctl.c.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/tty/tty_io.c | 1 +
 fs/compat_ioctl.c    | 2 --
 net/socket.c         | 2 ++
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 566728fbaf3c..cee8b69c6f72 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2755,6 +2755,7 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
 	int retval = -ENOIOCTLCMD;
 
 	switch (cmd) {
+	case TIOCOUTQ:
 	case TIOCSTI:
 	case TIOCGWINSZ:
 	case TIOCSWINSZ:
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index f279e77df256..d537888f3660 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -198,8 +198,6 @@ static int ppp_scompress(struct file *file, unsigned int cmd,
 
 #define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
 static unsigned int ioctl_pointer[] = {
-/* Little t */
-COMPATIBLE_IOCTL(TIOCOUTQ)
 #ifdef CONFIG_BLOCK
 /* Big S */
 COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
diff --git a/net/socket.c b/net/socket.c
index a60f48ab2130..371999a024fa 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -100,6 +100,7 @@
 #include <linux/if_tun.h>
 #include <linux/ipv6_route.h>
 #include <linux/route.h>
+#include <linux/termios.h>
 #include <linux/sockios.h>
 #include <net/busy_poll.h>
 #include <linux/errqueue.h>
@@ -3452,6 +3453,7 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 	case SIOCSARP:
 	case SIOCGARP:
 	case SIOCDARP:
+	case SIOCOUTQ:
 	case SIOCOUTQNSD:
 	case SIOCATMARK:
 		return sock_do_ioctl(net, sock, cmd, arg);
-- 
2.20.0

[PATCH v5 11/18] tty: handle compat PPP ioctls

[Arnd Bergmann]

Multiple tty devices are have tty devices that handle the
PPPIOCGUNIT and PPPIOCGCHAN ioctls. To avoid adding a compat_ioctl
handler to each of those, add it directly in tty_compat_ioctl
so we can remove the calls from fs/compat_ioctl.c.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/tty/tty_io.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index cee8b69c6f72..bf5241e0d772 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -87,6 +87,7 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/poll.h>
+#include <linux/ppp-ioctl.h>
 #include <linux/proc_fs.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -2811,6 +2812,9 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
 #endif
 	case TIOCGSOFTCAR:
 	case TIOCSSOFTCAR:
+
+	case PPPIOCGCHAN:
+	case PPPIOCGUNIT:
 		return tty_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 	case TIOCCONS:
 	case TIOCEXCL:
-- 
2.20.0

[PATCH v5 12/18] compat_ioctl: unify copy-in of ppp filters

[Arnd Bergmann]

From: Al Viro <viro@zeniv.linux.org.uk>

Now that isdn4linux is gone, the is only one implementation of PPPIOCSPASS
and PPPIOCSACTIVE in ppp_generic.c, so this is where the compat_ioctl
support should be implemented.

The two commands are implemented in very similar ways, so introduce
new helpers to allow sharing between the two and between native and
compat mode.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[arnd: rebased, and added changelog text]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/ppp/ppp_generic.c | 169 ++++++++++++++++++++++------------
 fs/compat_ioctl.c             |  37 --------
 2 files changed, 108 insertions(+), 98 deletions(-)

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index a30e41a56085..e3f207767589 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -554,29 +554,58 @@ static __poll_t ppp_poll(struct file *file, poll_table *wait)
 }
 
 #ifdef CONFIG_PPP_FILTER
-static int get_filter(void __user *arg, struct sock_filter **p)
+static struct bpf_prog *get_filter(struct sock_fprog *uprog)
+{
+	struct sock_fprog_kern fprog;
+	struct bpf_prog *res = NULL;
+	int err;
+
+	if (!uprog->len)
+		return NULL;
+
+	/* uprog->len is unsigned short, so no overflow here */
+	fprog.len = uprog->len * sizeof(struct sock_filter);
+	fprog.filter = memdup_user(uprog->filter, fprog.len);
+	if (IS_ERR(fprog.filter))
+		return ERR_CAST(fprog.filter);
+
+	err = bpf_prog_create(&res, &fprog);
+	kfree(fprog.filter);
+
+	return err ? ERR_PTR(err) : res;
+}
+
+static struct bpf_prog *ppp_get_filter(struct sock_fprog __user *p)
 {
 	struct sock_fprog uprog;
-	struct sock_filter *code = NULL;
-	int len;
 
-	if (copy_from_user(&uprog, arg, sizeof(uprog)))
-		return -EFAULT;
+	if (copy_from_user(&uprog, p, sizeof(struct sock_fprog)))
+		return ERR_PTR(-EFAULT);
+	return get_filter(&uprog);
+}
 
-	if (!uprog.len) {
-		*p = NULL;
-		return 0;
-	}
+#ifdef CONFIG_COMPAT
+struct sock_fprog32 {
+	unsigned short len;
+	compat_caddr_t filter;
+};
 
-	len = uprog.len * sizeof(struct sock_filter);
-	code = memdup_user(uprog.filter, len);
-	if (IS_ERR(code))
-		return PTR_ERR(code);
+#define PPPIOCSPASS32		_IOW('t', 71, struct sock_fprog32)
+#define PPPIOCSACTIVE32		_IOW('t', 70, struct sock_fprog32)
 
-	*p = code;
-	return uprog.len;
+static struct bpf_prog *compat_ppp_get_filter(struct sock_fprog32 __user *p)
+{
+	struct sock_fprog32 uprog32;
+	struct sock_fprog uprog;
+
+	if (copy_from_user(&uprog32, p, sizeof(struct sock_fprog32)))
+		return ERR_PTR(-EFAULT);
+	uprog.len = uprog32.len;
+	uprog.filter = compat_ptr(uprog32.filter);
+	return get_filter(&uprog);
 }
-#endif /* CONFIG_PPP_FILTER */
+#endif
+#endif
 
 static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
@@ -753,55 +782,25 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 #ifdef CONFIG_PPP_FILTER
 	case PPPIOCSPASS:
-	{
-		struct sock_filter *code;
-
-		err = get_filter(argp, &code);
-		if (err >= 0) {
-			struct bpf_prog *pass_filter = NULL;
-			struct sock_fprog_kern fprog = {
-				.len = err,
-				.filter = code,
-			};
-
-			err = 0;
-			if (fprog.filter)
-				err = bpf_prog_create(&pass_filter, &fprog);
-			if (!err) {
-				ppp_lock(ppp);
-				if (ppp->pass_filter)
-					bpf_prog_destroy(ppp->pass_filter);
-				ppp->pass_filter = pass_filter;
-				ppp_unlock(ppp);
-			}
-			kfree(code);
-		}
-		break;
-	}
 	case PPPIOCSACTIVE:
 	{
-		struct sock_filter *code;
+		struct bpf_prog *filter = ppp_get_filter(argp);
+		struct bpf_prog **which;
 
-		err = get_filter(argp, &code);
-		if (err >= 0) {
-			struct bpf_prog *active_filter = NULL;
-			struct sock_fprog_kern fprog = {
-				.len = err,
-				.filter = code,
-			};
-
-			err = 0;
-			if (fprog.filter)
-				err = bpf_prog_create(&active_filter, &fprog);
-			if (!err) {
-				ppp_lock(ppp);
-				if (ppp->active_filter)
-					bpf_prog_destroy(ppp->active_filter);
-				ppp->active_filter = active_filter;
-				ppp_unlock(ppp);
-			}
-			kfree(code);
+		if (IS_ERR(filter)) {
+			err = PTR_ERR(filter);
+			break;
 		}
+		if (cmd == PPPIOCSPASS)
+			which = &ppp->pass_filter;
+		else
+			which = &ppp->active_filter;
+		ppp_lock(ppp);
+		if (*which)
+			bpf_prog_destroy(*which);
+		*which = filter;
+		ppp_unlock(ppp);
+		err = 0;
 		break;
 	}
 #endif /* CONFIG_PPP_FILTER */
@@ -827,6 +826,51 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return err;
 }
 
+#ifdef CONFIG_COMPAT
+static long ppp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct ppp_file *pf;
+	int err = -ENOIOCTLCMD;
+	void __user *argp = (void __user *)arg;
+
+	mutex_lock(&ppp_mutex);
+
+	pf = file->private_data;
+	if (pf && pf->kind == INTERFACE) {
+		struct ppp *ppp = PF_TO_PPP(pf);
+		switch (cmd) {
+#ifdef CONFIG_PPP_FILTER
+		case PPPIOCSPASS32:
+		case PPPIOCSACTIVE32:
+		{
+			struct bpf_prog *filter = compat_ppp_get_filter(argp);
+			struct bpf_prog **which;
+
+			if (IS_ERR(filter)) {
+				err = PTR_ERR(filter);
+				break;
+			}
+			if (cmd == PPPIOCSPASS32)
+				which = &ppp->pass_filter;
+			else
+				which = &ppp->active_filter;
+			ppp_lock(ppp);
+			if (*which)
+				bpf_prog_destroy(*which);
+			*which = filter;
+			ppp_unlock(ppp);
+			err = 0;
+			break;
+		}
+#endif /* CONFIG_PPP_FILTER */
+		}
+	}
+	mutex_unlock(&ppp_mutex);
+
+	return err;
+}
+#endif
+
 static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf,
 			struct file *file, unsigned int cmd, unsigned long arg)
 {
@@ -895,6 +939,9 @@ static const struct file_operations ppp_device_fops = {
 	.write		= ppp_write,
 	.poll		= ppp_poll,
 	.unlocked_ioctl	= ppp_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= ppp_compat_ioctl,
+#endif
 	.open		= ppp_open,
 	.release	= ppp_release,
 	.llseek		= noop_llseek,
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index d537888f3660..eda41b2537f0 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -99,40 +99,6 @@ static int sg_grt_trans(struct file *file,
 }
 #endif /* CONFIG_BLOCK */
 
-struct sock_fprog32 {
-	unsigned short	len;
-	compat_caddr_t	filter;
-};
-
-#define PPPIOCSPASS32	_IOW('t', 71, struct sock_fprog32)
-#define PPPIOCSACTIVE32	_IOW('t', 70, struct sock_fprog32)
-
-static int ppp_sock_fprog_ioctl_trans(struct file *file,
-		unsigned int cmd, struct sock_fprog32 __user *u_fprog32)
-{
-	struct sock_fprog __user *u_fprog64 = compat_alloc_user_space(sizeof(struct sock_fprog));
-	void __user *fptr64;
-	u32 fptr32;
-	u16 flen;
-
-	if (get_user(flen, &u_fprog32->len) ||
-	    get_user(fptr32, &u_fprog32->filter))
-		return -EFAULT;
-
-	fptr64 = compat_ptr(fptr32);
-
-	if (put_user(flen, &u_fprog64->len) ||
-	    put_user(fptr64, &u_fprog64->filter))
-		return -EFAULT;
-
-	if (cmd == PPPIOCSPASS32)
-		cmd = PPPIOCSPASS;
-	else
-		cmd = PPPIOCSACTIVE;
-
-	return do_ioctl(file, cmd, (unsigned long) u_fprog64);
-}
-
 struct ppp_option_data32 {
 	compat_caddr_t	ptr;
 	u32			length;
@@ -285,9 +251,6 @@ static long do_ioctl_trans(unsigned int cmd,
 		return ppp_gidle(file, cmd, argp);
 	case PPPIOCSCOMPRESS32:
 		return ppp_scompress(file, cmd, argp);
-	case PPPIOCSPASS32:
-	case PPPIOCSACTIVE32:
-		return ppp_sock_fprog_ioctl_trans(file, cmd, argp);
 #ifdef CONFIG_BLOCK
 	case SG_GET_REQUEST_TABLE:
 		return sg_grt_trans(file, cmd, argp);
-- 
2.20.0

[PATCH v5 13/18] compat_ioctl: move PPPIOCSCOMPRESS to ppp_generic

[Arnd Bergmann]

From: Al Viro <viro@zeniv.linux.org.uk>

Rather than using a compat_alloc_user_space() buffer, moving
this next to the native handler allows sharing most of
the code, leaving only the user copy portion distinct.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/ppp/ppp_generic.c | 53 +++++++++++++++++++++++++----------
 fs/compat_ioctl.c             | 32 ---------------------
 2 files changed, 38 insertions(+), 47 deletions(-)

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index e3f207767589..2ab67bad6224 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -270,7 +270,7 @@ static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb);
 static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp);
 static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb);
 #endif /* CONFIG_PPP_MULTILINK */
-static int ppp_set_compress(struct ppp *ppp, unsigned long arg);
+static int ppp_set_compress(struct ppp *ppp, struct ppp_option_data *data);
 static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound);
 static void ppp_ccp_closed(struct ppp *ppp);
 static struct compressor *find_compressor(int type);
@@ -708,9 +708,14 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		break;
 
 	case PPPIOCSCOMPRESS:
-		err = ppp_set_compress(ppp, arg);
+	{
+		struct ppp_option_data data;
+		if (copy_from_user(&data, argp, sizeof(data)))
+			err = -EFAULT;
+		else
+			err = ppp_set_compress(ppp, &data);
 		break;
-
+	}
 	case PPPIOCGUNIT:
 		if (put_user(ppp->file.index, p))
 			break;
@@ -827,6 +832,13 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 }
 
 #ifdef CONFIG_COMPAT
+struct ppp_option_data32 {
+	compat_uptr_t		ptr;
+	u32			length;
+	compat_int_t		transmit;
+};
+#define PPPIOCSCOMPRESS32	_IOW('t', 77, struct ppp_option_data32)
+
 static long ppp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct ppp_file *pf;
@@ -863,6 +875,21 @@ static long ppp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long
 			break;
 		}
 #endif /* CONFIG_PPP_FILTER */
+		case PPPIOCSCOMPRESS32:
+		{
+			struct ppp_option_data32 data32;
+			if (copy_from_user(&data32, argp, sizeof(data32))) {
+				err = -EFAULT;
+			} else {
+				struct ppp_option_data data = {
+					.ptr = compat_ptr(data32.ptr),
+					.length = data32.length,
+					.transmit = data32.transmit
+				};
+				err = ppp_set_compress(ppp, &data);
+			}
+			break;
+		}
 		}
 	}
 	mutex_unlock(&ppp_mutex);
@@ -2781,24 +2808,20 @@ ppp_output_wakeup(struct ppp_channel *chan)
 
 /* Process the PPPIOCSCOMPRESS ioctl. */
 static int
-ppp_set_compress(struct ppp *ppp, unsigned long arg)
+ppp_set_compress(struct ppp *ppp, struct ppp_option_data *data)
 {
-	int err;
+	int err = -EFAULT;
 	struct compressor *cp, *ocomp;
-	struct ppp_option_data data;
 	void *state, *ostate;
 	unsigned char ccp_option[CCP_MAX_OPTION_LENGTH];
 
-	err = -EFAULT;
-	if (copy_from_user(&data, (void __user *) arg, sizeof(data)))
-		goto out;
-	if (data.length > CCP_MAX_OPTION_LENGTH)
+	if (data->length > CCP_MAX_OPTION_LENGTH)
 		goto out;
-	if (copy_from_user(ccp_option, (void __user *) data.ptr, data.length))
+	if (copy_from_user(ccp_option, data->ptr, data->length))
 		goto out;
 
 	err = -EINVAL;
-	if (data.length < 2 || ccp_option[1] < 2 || ccp_option[1] > data.length)
+	if (data->length < 2 || ccp_option[1] < 2 || ccp_option[1] > data->length)
 		goto out;
 
 	cp = try_then_request_module(
@@ -2808,8 +2831,8 @@ ppp_set_compress(struct ppp *ppp, unsigned long arg)
 		goto out;
 
 	err = -ENOBUFS;
-	if (data.transmit) {
-		state = cp->comp_alloc(ccp_option, data.length);
+	if (data->transmit) {
+		state = cp->comp_alloc(ccp_option, data->length);
 		if (state) {
 			ppp_xmit_lock(ppp);
 			ppp->xstate &= ~SC_COMP_RUN;
@@ -2827,7 +2850,7 @@ ppp_set_compress(struct ppp *ppp, unsigned long arg)
 			module_put(cp->owner);
 
 	} else {
-		state = cp->decomp_alloc(ccp_option, data.length);
+		state = cp->decomp_alloc(ccp_option, data->length);
 		if (state) {
 			ppp_recv_lock(ppp);
 			ppp->rstate &= ~SC_DECOMP_RUN;
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index eda41b2537f0..0b5a732d7afd 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -99,13 +99,6 @@ static int sg_grt_trans(struct file *file,
 }
 #endif /* CONFIG_BLOCK */
 
-struct ppp_option_data32 {
-	compat_caddr_t	ptr;
-	u32			length;
-	compat_int_t		transmit;
-};
-#define PPPIOCSCOMPRESS32	_IOW('t', 77, struct ppp_option_data32)
-
 struct ppp_idle32 {
 	compat_time_t xmit_idle;
 	compat_time_t recv_idle;
@@ -133,29 +126,6 @@ static int ppp_gidle(struct file *file, unsigned int cmd,
 	return err;
 }
 
-static int ppp_scompress(struct file *file, unsigned int cmd,
-	struct ppp_option_data32 __user *odata32)
-{
-	struct ppp_option_data __user *odata;
-	__u32 data;
-	void __user *datap;
-
-	odata = compat_alloc_user_space(sizeof(*odata));
-
-	if (get_user(data, &odata32->ptr))
-		return -EFAULT;
-
-	datap = compat_ptr(data);
-	if (put_user(datap, &odata->ptr))
-		return -EFAULT;
-
-	if (copy_in_user(&odata->length, &odata32->length,
-			 sizeof(__u32) + sizeof(int)))
-		return -EFAULT;
-
-	return do_ioctl(file, PPPIOCSCOMPRESS, (unsigned long) odata);
-}
-
 /*
  * simple reversible transform to make our table more evenly
  * distributed after sorting.
@@ -249,8 +219,6 @@ static long do_ioctl_trans(unsigned int cmd,
 	switch (cmd) {
 	case PPPIOCGIDLE32:
 		return ppp_gidle(file, cmd, argp);
-	case PPPIOCSCOMPRESS32:
-		return ppp_scompress(file, cmd, argp);
 #ifdef CONFIG_BLOCK
 	case SG_GET_REQUEST_TABLE:
 		return sg_grt_trans(file, cmd, argp);
-- 
2.20.0

[PATCH v5 14/18] compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t

[Arnd Bergmann]

The ppp_idle structure is defined in terms of __kernel_time_t, which is
defined as 'long' on all architectures, and this usage is not affected
by the y2038 problem since it transports a time interval rather than an
absolute time.

However, the ppp user space defines the same structure as time_t, which
may be 64-bit wide on new libc versions even on 32-bit architectures.

It's easy enough to just handle both possible structure layouts on
all architectures, to deal with the possibility that a user space ppp
implementation comes with its own ppp_idle structure definition, as well
as to document the fact that the driver is y2038-safe.

Doing this also avoids the need for a special compat mode translation,
since 32-bit and 64-bit kernels now support the same interfaces.  The old
32-bit structure is also available on native 64-bit architectures now,
but this is harmless.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 Documentation/networking/ppp_generic.txt |  2 ++
 drivers/net/ppp/ppp_generic.c            | 19 ++++++++++----
 fs/compat_ioctl.c                        | 32 ++----------------------
 include/uapi/linux/ppp-ioctl.h           |  2 ++
 include/uapi/linux/ppp_defs.h            | 14 +++++++++++
 5 files changed, 34 insertions(+), 35 deletions(-)

diff --git a/Documentation/networking/ppp_generic.txt b/Documentation/networking/ppp_generic.txt
index 61daf4b39600..fd563aff5fc9 100644
--- a/Documentation/networking/ppp_generic.txt
+++ b/Documentation/networking/ppp_generic.txt
@@ -378,6 +378,8 @@ an interface unit are:
   CONFIG_PPP_FILTER option is enabled, the set of packets which reset
   the transmit and receive idle timers is restricted to those which
   pass the `active' packet filter.
+  Two versions of this command exist, to deal with user space
+  expecting times as either 32-bit or 64-bit time_t seconds.
 
 * PPPIOCSMAXCID sets the maximum connection-ID parameter (and thus the
   number of connection slots) for the TCP header compressor and
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 2ab67bad6224..6b4e227cb002 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -612,7 +612,8 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	struct ppp_file *pf;
 	struct ppp *ppp;
 	int err = -EFAULT, val, val2, i;
-	struct ppp_idle idle;
+	struct ppp_idle32 idle32;
+	struct ppp_idle64 idle64;
 	struct npioctl npi;
 	int unit, cflags;
 	struct slcompress *vj;
@@ -735,10 +736,18 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		err = 0;
 		break;
 
-	case PPPIOCGIDLE:
-		idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ;
-		idle.recv_idle = (jiffies - ppp->last_recv) / HZ;
-		if (copy_to_user(argp, &idle, sizeof(idle)))
+	case PPPIOCGIDLE32:
+                idle32.xmit_idle = (jiffies - ppp->last_xmit) / HZ;
+                idle32.recv_idle = (jiffies - ppp->last_recv) / HZ;
+                if (copy_to_user(argp, &idle32, sizeof(idle32)))
+			break;
+		err = 0;
+		break;
+
+	case PPPIOCGIDLE64:
+		idle64.xmit_idle = (jiffies - ppp->last_xmit) / HZ;
+		idle64.recv_idle = (jiffies - ppp->last_recv) / HZ;
+		if (copy_to_user(argp, &idle64, sizeof(idle64)))
 			break;
 		err = 0;
 		break;
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 0b5a732d7afd..f97cf698cfdd 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -99,33 +99,6 @@ static int sg_grt_trans(struct file *file,
 }
 #endif /* CONFIG_BLOCK */
 
-struct ppp_idle32 {
-	compat_time_t xmit_idle;
-	compat_time_t recv_idle;
-};
-#define PPPIOCGIDLE32		_IOR('t', 63, struct ppp_idle32)
-
-static int ppp_gidle(struct file *file, unsigned int cmd,
-		struct ppp_idle32 __user *idle32)
-{
-	struct ppp_idle __user *idle;
-	__kernel_time_t xmit, recv;
-	int err;
-
-	idle = compat_alloc_user_space(sizeof(*idle));
-
-	err = do_ioctl(file, PPPIOCGIDLE, (unsigned long) idle);
-
-	if (!err) {
-		if (get_user(xmit, &idle->xmit_idle) ||
-		    get_user(recv, &idle->recv_idle) ||
-		    put_user(xmit, &idle32->xmit_idle) ||
-		    put_user(recv, &idle32->recv_idle))
-			err = -EFAULT;
-	}
-	return err;
-}
-
 /*
  * simple reversible transform to make our table more evenly
  * distributed after sorting.
@@ -192,7 +165,8 @@ COMPATIBLE_IOCTL(PPPIOCGDEBUG)
 COMPATIBLE_IOCTL(PPPIOCSDEBUG)
 /* PPPIOCSPASS is translated */
 /* PPPIOCSACTIVE is translated */
-/* PPPIOCGIDLE is translated */
+COMPATIBLE_IOCTL(PPPIOCGIDLE32)
+COMPATIBLE_IOCTL(PPPIOCGIDLE64)
 COMPATIBLE_IOCTL(PPPIOCNEWUNIT)
 COMPATIBLE_IOCTL(PPPIOCATTACH)
 COMPATIBLE_IOCTL(PPPIOCDETACH)
@@ -217,8 +191,6 @@ static long do_ioctl_trans(unsigned int cmd,
 	void __user *argp = compat_ptr(arg);
 
 	switch (cmd) {
-	case PPPIOCGIDLE32:
-		return ppp_gidle(file, cmd, argp);
 #ifdef CONFIG_BLOCK
 	case SG_GET_REQUEST_TABLE:
 		return sg_grt_trans(file, cmd, argp);
diff --git a/include/uapi/linux/ppp-ioctl.h b/include/uapi/linux/ppp-ioctl.h
index 88b5f9990320..7bd2a5a75348 100644
--- a/include/uapi/linux/ppp-ioctl.h
+++ b/include/uapi/linux/ppp-ioctl.h
@@ -104,6 +104,8 @@ struct pppol2tp_ioc_stats {
 #define PPPIOCGDEBUG	_IOR('t', 65, int)	/* Read debug level */
 #define PPPIOCSDEBUG	_IOW('t', 64, int)	/* Set debug level */
 #define PPPIOCGIDLE	_IOR('t', 63, struct ppp_idle) /* get idle time */
+#define PPPIOCGIDLE32	_IOR('t', 63, struct ppp_idle32) /* 32-bit times */
+#define PPPIOCGIDLE64	_IOR('t', 63, struct ppp_idle64) /* 64-bit times */
 #define PPPIOCNEWUNIT	_IOWR('t', 62, int)	/* create new ppp unit */
 #define PPPIOCATTACH	_IOW('t', 61, int)	/* attach to ppp unit */
 #define PPPIOCDETACH	_IOW('t', 60, int)	/* obsolete, do not use */
diff --git a/include/uapi/linux/ppp_defs.h b/include/uapi/linux/ppp_defs.h
index fff51b91b409..0039fa39a358 100644
--- a/include/uapi/linux/ppp_defs.h
+++ b/include/uapi/linux/ppp_defs.h
@@ -142,10 +142,24 @@ struct ppp_comp_stats {
 /*
  * The following structure records the time in seconds since
  * the last NP packet was sent or received.
+ *
+ * Linux implements both 32-bit and 64-bit time_t versions
+ * for compatibility with user space that defines ppp_idle
+ * based on the libc time_t.
  */
 struct ppp_idle {
     __kernel_time_t xmit_idle;	/* time since last NP packet sent */
     __kernel_time_t recv_idle;	/* time since last NP packet received */
 };
 
+struct ppp_idle32 {
+    __s32 xmit_idle;		/* time since last NP packet sent */
+    __s32 recv_idle;		/* time since last NP packet received */
+};
+
+struct ppp_idle64 {
+    __s64 xmit_idle;		/* time since last NP packet sent */
+    __s64 recv_idle;		/* time since last NP packet received */
+};
+
 #endif /* _UAPI_PPP_DEFS_H_ */
-- 
2.20.0

[PATCH v5 15/18] compat_ioctl: ppp: move simple commands into ppp_generic.c

[Arnd Bergmann]

All ppp commands that are not already handled in ppp_compat_ioctl()
are compatible, so they can now handled by calling the native
ppp_ioctl() directly.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/ppp/ppp_generic.c |  4 ++++
 fs/compat_ioctl.c             | 32 --------------------------------
 2 files changed, 4 insertions(+), 32 deletions(-)

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 6b4e227cb002..ea1507c7c40e 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -903,6 +903,10 @@ static long ppp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long
 	}
 	mutex_unlock(&ppp_mutex);
 
+	/* all other commands have compatible arguments */
+	if (err == -ENOIOCTLCMD)
+		err = ppp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+
 	return err;
 }
 #endif
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index f97cf698cfdd..3d127bb6357a 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -144,38 +144,6 @@ COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
 COMPATIBLE_IOCTL(SG_SET_KEEP_ORPHAN)
 COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN)
 #endif
-/* PPP stuff */
-COMPATIBLE_IOCTL(PPPIOCGFLAGS)
-COMPATIBLE_IOCTL(PPPIOCSFLAGS)
-COMPATIBLE_IOCTL(PPPIOCGASYNCMAP)
-COMPATIBLE_IOCTL(PPPIOCSASYNCMAP)
-COMPATIBLE_IOCTL(PPPIOCGUNIT)
-COMPATIBLE_IOCTL(PPPIOCGRASYNCMAP)
-COMPATIBLE_IOCTL(PPPIOCSRASYNCMAP)
-COMPATIBLE_IOCTL(PPPIOCGMRU)
-COMPATIBLE_IOCTL(PPPIOCSMRU)
-COMPATIBLE_IOCTL(PPPIOCSMAXCID)
-COMPATIBLE_IOCTL(PPPIOCGXASYNCMAP)
-COMPATIBLE_IOCTL(PPPIOCSXASYNCMAP)
-COMPATIBLE_IOCTL(PPPIOCXFERUNIT)
-/* PPPIOCSCOMPRESS is translated */
-COMPATIBLE_IOCTL(PPPIOCGNPMODE)
-COMPATIBLE_IOCTL(PPPIOCSNPMODE)
-COMPATIBLE_IOCTL(PPPIOCGDEBUG)
-COMPATIBLE_IOCTL(PPPIOCSDEBUG)
-/* PPPIOCSPASS is translated */
-/* PPPIOCSACTIVE is translated */
-COMPATIBLE_IOCTL(PPPIOCGIDLE32)
-COMPATIBLE_IOCTL(PPPIOCGIDLE64)
-COMPATIBLE_IOCTL(PPPIOCNEWUNIT)
-COMPATIBLE_IOCTL(PPPIOCATTACH)
-COMPATIBLE_IOCTL(PPPIOCDETACH)
-COMPATIBLE_IOCTL(PPPIOCSMRRU)
-COMPATIBLE_IOCTL(PPPIOCCONNECT)
-COMPATIBLE_IOCTL(PPPIOCDISCONN)
-COMPATIBLE_IOCTL(PPPIOCATTCHAN)
-COMPATIBLE_IOCTL(PPPIOCGCHAN)
-COMPATIBLE_IOCTL(PPPIOCGL2TPSTATS)
 };
 
 /*
-- 
2.20.0

[PATCH v5 16/18] compat_ioctl: move SG_GET_REQUEST_TABLE handling

[Arnd Bergmann]

SG_GET_REQUEST_TABLE is now the last ioctl command that needs a conversion
handler. This is only used in a single file, so the implementation should
be there.

I'm trying to simplify it in the process, to get rid of
the compat_alloc_user_space() and extra copy, by adding a
put_compat_request_table() function instead, which copies the data in
the right format to user space.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/scsi/sg.c | 40 ++++++++++++++++++++++++++++++-----
 fs/compat_ioctl.c | 54 +----------------------------------------------
 2 files changed, 36 insertions(+), 58 deletions(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 8ae096af2667..9e4ef22b3579 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -889,6 +889,33 @@ sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo)
 	}
 }
 
+#ifdef CONFIG_COMPAT
+struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
+	char req_state;
+	char orphan;
+	char sg_io_owned;
+	char problem;
+	int pack_id;
+	compat_uptr_t usr_ptr;
+	unsigned int duration;
+	int unused;
+};
+
+static int put_compat_request_table(struct compat_sg_req_info __user *o,
+				    struct sg_req_info *rinfo)
+{
+	int i;
+	for (i = 0; i < SG_MAX_QUEUE; i++) {
+		if (copy_to_user(o + i, rinfo + i, offsetof(sg_req_info_t, usr_ptr)) ||
+		    put_user((uintptr_t)rinfo[i].usr_ptr, &o[i].usr_ptr) ||
+		    put_user(rinfo[i].duration, &o[i].duration) ||
+		    put_user(rinfo[i].unused, &o[i].unused))
+			return -EFAULT;
+	}
+	return 0;
+}
+#endif
+
 static long
 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 {
@@ -1069,9 +1096,7 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 		val = (sdp->device ? 1 : 0);
 		return put_user(val, ip);
 	case SG_GET_REQUEST_TABLE:
-		if (!access_ok(p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
-			return -EFAULT;
-		else {
+		{
 			sg_req_info_t *rinfo;
 
 			rinfo = kcalloc(SG_MAX_QUEUE, SZ_SG_REQ_INFO,
@@ -1081,8 +1106,13 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 			read_lock_irqsave(&sfp->rq_list_lock, iflags);
 			sg_fill_request_table(sfp, rinfo);
 			read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
-			result = __copy_to_user(p, rinfo,
-						SZ_SG_REQ_INFO * SG_MAX_QUEUE);
+	#ifdef CONFIG_COMPAT
+			if (in_compat_syscall())
+				result = put_compat_request_table(p, rinfo);
+			else
+	#endif
+				result = copy_to_user(p, rinfo,
+						      SZ_SG_REQ_INFO * SG_MAX_QUEUE);
 			result = result ? -EFAULT : 0;
 			kfree(rinfo);
 			return result;
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 3d127bb6357a..6837a3904b8c 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -52,53 +52,6 @@
 
 #include <linux/sort.h>
 
-static int do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	int err;
-
-	err = security_file_ioctl(file, cmd, arg);
-	if (err)
-		return err;
-
-	return vfs_ioctl(file, cmd, arg);
-}
-
-#ifdef CONFIG_BLOCK
-struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
-	char req_state;
-	char orphan;
-	char sg_io_owned;
-	char problem;
-	int pack_id;
-	compat_uptr_t usr_ptr;
-	unsigned int duration;
-	int unused;
-};
-
-static int sg_grt_trans(struct file *file,
-		unsigned int cmd, struct compat_sg_req_info __user *o)
-{
-	int err, i;
-	sg_req_info_t __user *r;
-	r = compat_alloc_user_space(sizeof(sg_req_info_t)*SG_MAX_QUEUE);
-	err = do_ioctl(file, cmd, (unsigned long)r);
-	if (err < 0)
-		return err;
-	for (i = 0; i < SG_MAX_QUEUE; i++) {
-		void __user *ptr;
-		int d;
-
-		if (copy_in_user(o + i, r + i, offsetof(sg_req_info_t, usr_ptr)) ||
-		    get_user(ptr, &r[i].usr_ptr) ||
-		    get_user(d, &r[i].duration) ||
-		    put_user((u32)(unsigned long)(ptr), &o[i].usr_ptr) ||
-		    put_user(d, &o[i].duration))
-			return -EFAULT;
-	}
-	return err;
-}
-#endif /* CONFIG_BLOCK */
-
 /*
  * simple reversible transform to make our table more evenly
  * distributed after sorting.
@@ -121,6 +74,7 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
 #ifdef CONFIG_BLOCK
 /* SG stuff */
 COMPATIBLE_IOCTL(SG_IO)
+COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
 COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
 COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
 COMPATIBLE_IOCTL(SG_EMULATED_HOST)
@@ -156,13 +110,7 @@ COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN)
 static long do_ioctl_trans(unsigned int cmd,
 		 unsigned long arg, struct file *file)
 {
-	void __user *argp = compat_ptr(arg);
-
 	switch (cmd) {
-#ifdef CONFIG_BLOCK
-	case SG_GET_REQUEST_TABLE:
-		return sg_grt_trans(file, cmd, argp);
-#endif
 	}
 
 	return -ENOIOCTLCMD;
-- 
2.20.0

[PATCH v5 17/18] pktcdvd: add compat_ioctl handler

[Arnd Bergmann]

pkt_ioctl() implements the generic SCSI_IOCTL_SEND_COMMAND
and some cdrom ioctls by forwarding to the underlying block
device. For compat_ioctl handling, this always takes a
roundtrip through fs/compat_ioctl.c that we should try
to avoid, at least for the compatible commands.

CDROM_SEND_PACKET is an exception here, it requires special
translation in compat_blkdev_driver_ioctl().

CDROM_LAST_WRITTEN has no compat handling at the moment.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/block/pktcdvd.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 024060165afa..b5950b7851b0 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2664,6 +2664,28 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+static int pkt_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	/* compatible */
+	case CDROMEJECT:
+	case CDROMMULTISESSION:
+	case CDROMREADTOCENTRY:
+	case SCSI_IOCTL_SEND_COMMAND:
+		return pkt_ioctl(bdev, mode, cmd, (unsigned long)compat_ptr(arg));
+
+
+	/* FIXME: no handler so far */
+	case CDROM_LAST_WRITTEN:
+	/* handled in compat_blkdev_driver_ioctl */
+	case CDROM_SEND_PACKET:
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+#endif
+
 static unsigned int pkt_check_events(struct gendisk *disk,
 				     unsigned int clearing)
 {
@@ -2685,6 +2707,9 @@ static const struct block_device_operations pktcdvd_ops = {
 	.open =			pkt_open,
 	.release =		pkt_close,
 	.ioctl =		pkt_ioctl,
+#ifdef CONFIG_COMPAT
+	.ioctl =		pkt_compat_ioctl,
+#endif
 	.check_events =		pkt_check_events,
 };
 
-- 
2.20.0

[PATCH v5 18/18] scsi: sd: enable compat ioctls for sed-opal

[Arnd Bergmann]

The sed_ioctl() function is written to be compatible between
32-bit and 64-bit processes, however compat mode is only
wired up for nvme, not for sd.

Add the missing call to sed_ioctl() in sd_compat_ioctl().

Fixes: d80210f25ff0 ("sd: add support for TCG OPAL self encrypting disks")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/scsi/sd.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 149d406aacc9..8b71664c54bd 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1693,20 +1693,30 @@ static void sd_rescan(struct device *dev)
 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
 			   unsigned int cmd, unsigned long arg)
 {
-	struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
+	struct gendisk *disk = bdev->bd_disk;
+	struct scsi_disk *sdkp = scsi_disk(disk);
+	struct scsi_device *sdev = sdkp->device;
+	void __user *p = compat_ptr(arg);
 	int error;
 
+	error = scsi_verify_blk_ioctl(bdev, cmd);
+	if (error < 0)
+		return error;
+
 	error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
 			(mode & FMODE_NDELAY) != 0);
 	if (error)
 		return error;
+
+	if (is_sed_ioctl(cmd))
+		return sed_ioctl(sdkp->opal_dev, cmd, p);
 	       
 	/* 
 	 * Let the static ioctl translation table take care of it.
 	 */
 	if (!sdev->host->hostt->compat_ioctl)
 		return -ENOIOCTLCMD; 
-	return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
+	return sdev->host->hostt->compat_ioctl(sdev, cmd, p);
 }
 #endif
 
-- 
2.20.0

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Dave Chinner]

On Wed, Aug 14, 2019 at 10:42:28PM +0200, Arnd Bergmann wrote:
> For 31-bit s390 user space, we have to pass pointer arguments through
> compat_ptr() in the compat_ioctl handler.

Seems fair enough, but...
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  fs/xfs/xfs_ioctl32.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
> index 7fcf7569743f..ad91e81a2fcf 100644
> --- a/fs/xfs/xfs_ioctl32.c
> +++ b/fs/xfs/xfs_ioctl32.c
> @@ -547,7 +547,7 @@ xfs_file_compat_ioctl(
>  	struct inode		*inode = file_inode(filp);
>  	struct xfs_inode	*ip = XFS_I(inode);
>  	struct xfs_mount	*mp = ip->i_mount;
> -	void			__user *arg = (void __user *)p;
> +	void			__user *arg = compat_ptr(p);
>  	int			error;
>  
>  	trace_xfs_file_compat_ioctl(ip);
> @@ -576,7 +576,7 @@ xfs_file_compat_ioctl(
>  	case XFS_IOC_SCRUB_METADATA:
>  	case XFS_IOC_BULKSTAT:
>  	case XFS_IOC_INUMBERS:
> -		return xfs_file_ioctl(filp, cmd, p);
> +		return xfs_file_ioctl(filp, cmd, (unsigned long)arg);

I don't really like having to sprinkle special casts through the
code because of this.

Perhaps do something like:

static inline unsigned long compat_ptr_mask(unsigned long p)
{
	return (unsigned long)compat_ptr(p);
}

and then up front you can do:

	void	__user *arg;

	p = compat_ptr_mask(p);
	arg = (void __user *)p;


and then the rest of the code remains unchanged by now uses p
correctly instead of having to change all the code to cast arg back
to an unsigned long...

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Arnd Bergmann]

On Wed, Aug 14, 2019 at 11:39 PM Dave Chinner <david@fromorbit.com> wrote:
> >       case XFS_IOC_BULKSTAT:
> >       case XFS_IOC_INUMBERS:
> > -             return xfs_file_ioctl(filp, cmd, p);
> > +             return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
>
> I don't really like having to sprinkle special casts through the
> code because of this.
>
> Perhaps do something like:
>
> static inline unsigned long compat_ptr_mask(unsigned long p)
> {
>         return (unsigned long)compat_ptr(p);
> }
>
> and then up front you can do:
>
>         void    __user *arg;
>
>         p = compat_ptr_mask(p);
>         arg = (void __user *)p;
>
>
> and then the rest of the code remains unchanged by now uses p
> correctly instead of having to change all the code to cast arg back
> to an unsigned long...
>

In part 1 of the series, I define this function as a global:

long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
        if (!file->f_op->unlocked_ioctl)
                return -ENOIOCTLCMD;

        return file->f_op->unlocked_ioctl(file, cmd, (unsigned
long)compat_ptr(arg));
}

How about using that to replace the individual casts:

-       return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
+      return compat_ptr_ioctl(filp, cmd, arg);

It adds another indirection, but it avoids all the casts and
uses existing mechanism.

     Arnd

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Christoph Hellwig]

On Thu, Aug 15, 2019 at 07:37:53AM +1000, Dave Chinner wrote:
> > @@ -576,7 +576,7 @@ xfs_file_compat_ioctl(
> >  	case XFS_IOC_SCRUB_METADATA:
> >  	case XFS_IOC_BULKSTAT:
> >  	case XFS_IOC_INUMBERS:
> > -		return xfs_file_ioctl(filp, cmd, p);
> > +		return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
> 
> I don't really like having to sprinkle special casts through the
> code because of this.

True.  But the proper fix is to not do the indirection through
xfs_file_ioctl but instead to call xfs_ioc_scrub_metadata,
xfs_ioc_bulkstat, etc directly which all take a void __user
arguments already.

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Arnd Bergmann]

On Thu, Aug 15, 2019 at 9:13 AM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Thu, Aug 15, 2019 at 07:37:53AM +1000, Dave Chinner wrote:
> > > @@ -576,7 +576,7 @@ xfs_file_compat_ioctl(
> > >     case XFS_IOC_SCRUB_METADATA:
> > >     case XFS_IOC_BULKSTAT:
> > >     case XFS_IOC_INUMBERS:
> > > -           return xfs_file_ioctl(filp, cmd, p);
> > > +           return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
> >
> > I don't really like having to sprinkle special casts through the
> > code because of this.
>
> True.  But the proper fix is to not do the indirection through
> xfs_file_ioctl but instead to call xfs_ioc_scrub_metadata,
> xfs_ioc_bulkstat, etc directly which all take a void __user
> arguments already.

I'm not sure that's better: This would end up duplicating all
of xfs_file_ioctl(), which is already a fairly long function, compared
to the current way of having a large set of commands all handled
with a single line.

From looking at other subsystems, what I find to work best is to
move the compat handler into the same file as the native code
and then structure the files so that shared handlers get
put into one place, something like

/* these are the ones that have the same ABI for 32-bit and 64-bit tasks */
static int xfs_compatible_file_ioctl(struct file *filp, unsigned cmd,
void __user *p)
{
      int ret = -ENOIOCTLCMD;

       switch (cmd) {
       case XFS_IOC_DIOINFO:
            ...
        case ...
     }

     return ret;
}

long
xfs_file_compat_ioctl(
        struct file             *filp,
        unsigned                cmd,
        unsigned long           p)
{
       ret = xfs_compatible_file_ioctl(filp, cmd, compat_ptr(p));
       if (ret != -ENOIOCTLCMD)
              return ret;

      /* all incompatible ones below */
      switch (cmd) {
         ...
      }
}
Having them in one place makes it more obvious to readers how the
native and compat handlers fit together, and makes it easier to keep
the two in sync.

That would of course be a much larger change to how it's done today,
and it's way out of scope of what I want to achieve in my (already
too long) series.

     Arnd

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Christoph Hellwig]

In many ways I'd actually much rather have a table driven approach.
Let me try something..

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Christoph Hellwig]

On Thu, Aug 15, 2019 at 01:02:11AM -0700, Christoph Hellwig wrote:
> In many ways I'd actually much rather have a table driven approach.
> Let me try something..

Ok, it seems like we don't even need a table containing native and
compat as we can just fall back.  The tables still seem nicer to read,
though.

Let me know what you think of this:

http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table

I also wonder if we should life the ioctl handler tables to the
VFS..

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Arnd Bergmann]

On Thu, Aug 15, 2019 at 12:26 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Thu, Aug 15, 2019 at 01:02:11AM -0700, Christoph Hellwig wrote:
> > In many ways I'd actually much rather have a table driven approach.
> > Let me try something..
>
> Ok, it seems like we don't even need a table containing native and
> compat as we can just fall back.  The tables still seem nicer to read,
> though.
>
> Let me know what you think of this:
>
> http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table

These all look like useful cleanups, but I'm a little worried about introducing
merge conflicts with my own patches. I would want to have my series get
merged as a complete branch since each patch that removes a bit of
fs/compat_ioctl.c would clash with a patch removing the adjacent bits
otherwise.

I still haven't heard from Al regarding what he thinks of my v5 series.
If he wants me to send a pull request for it, I can of course add in
your patches  after they are fully reviewed.

> I also wonder if we should life the ioctl handler tables to the VFS.

The idea of these tables has come up a few times in the past,
and there are a couple of subsystems that have something like it,
e.g. drivers/media.

Usually you'd want to combine the table with a more generic way to
do the copy_from_user()/copy_to_user() on the argument, but that
in turn requires all commands to be defined correctly (a lot of drivers
have some commands that specify the wrong direction or the wrong
size, or one that predates the _IO() macro).

What I could imaging having in the long run is to have the ioctl table
attached to the file_operations structure, and then define it in a way
that handles at least the more common variations:

- copy_from_user to stack, pass a kernel pointer to handler
- a single entry for commands that are 32/64-bit compatible
- entries that are only used for native vs compat mode if they
  have incompatible arguments (this could also be handled
  by calling in_compat_syscall() in the handler itself).
- a flag to specify handlers that require the __user pointer instead
  of the implied copy.

Doing this right will certainly require several revisions of patch
series and lots of discussions, and is unrelated to the removal
of fs/compat_ioctl.c, so I'd much prefer to get this series merged
before we start working on that.

       Arnd

Re: [PATCH v5 03/18] gfs2: add compat_ioctl support

[Bob Peterson]

----- Original Message -----
> Out of the four ioctl commands supported on gfs2, only FITRIM
> works in compat mode.
> 
> Add a proper handler based on the ext4 implementation.
> 
> Fixes: 6ddc5c3ddf25 ("gfs2: getlabel support")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  fs/gfs2/file.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)

Hi,

Reviewed-by: Bob Peterson <rpeterso@redhat.com>

Regards,

Bob Peterson

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Dave Chinner]

On Thu, Aug 15, 2019 at 03:26:49AM -0700, Christoph Hellwig wrote:
> On Thu, Aug 15, 2019 at 01:02:11AM -0700, Christoph Hellwig wrote:
> > In many ways I'd actually much rather have a table driven approach.
> > Let me try something..
> 
> Ok, it seems like we don't even need a table containing native and
> compat as we can just fall back.  The tables still seem nicer to read,
> though.
> 
> Let me know what you think of this:
> 
> http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table

Lots to like in that handful of patches. :)

It can easily go before or after Arnd's patch, and the merge
conflict either way would be minor, so I'm not really fussed either
way this gets sorted out...

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Christoph Hellwig]

On Thu, Aug 15, 2019 at 10:15:12PM +1000, Dave Chinner wrote:
> > http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table
> 
> Lots to like in that handful of patches. :)
> 
> It can easily go before or after Arnd's patch, and the merge
> conflict either way would be minor, so I'm not really fussed either
> way this gets sorted out...

The other thing we could do is to just pick the two important ones:

http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table-5.3

and throw that into Arnds series, or even 5.3, and then defer the
table thing until later.

Re: [PATCH v5 10/18] compat_ioctl: move SIOCOUTQ out of compat_ioctl.c

[Greg Kroah-Hartman]

On Wed, Aug 14, 2019 at 10:54:45PM +0200, Arnd Bergmann wrote:
> All users of this call are in socket or tty code, so handling
> it there means we can avoid the table entry in fs/compat_ioctl.c.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/tty/tty_io.c | 1 +
>  fs/compat_ioctl.c    | 2 --
>  net/socket.c         | 2 ++
>  3 files changed, 3 insertions(+), 2 deletions(-)a

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH v5 11/18] tty: handle compat PPP ioctls

[Greg Kroah-Hartman]

On Wed, Aug 14, 2019 at 10:54:46PM +0200, Arnd Bergmann wrote:
> Multiple tty devices are have tty devices that handle the
> PPPIOCGUNIT and PPPIOCGCHAN ioctls. To avoid adding a compat_ioctl
> handler to each of those, add it directly in tty_compat_ioctl
> so we can remove the calls from fs/compat_ioctl.c.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH v5 05/18] watchdog: cpwd: use generic compat_ptr_ioctl

[Guenter Roeck]

On Wed, Aug 14, 2019 at 10:42:32PM +0200, Arnd Bergmann wrote:
> The cpwd_compat_ioctl() contains a bogus mutex that dates
> back to a leftover BKL instance.
> 
> Simplify the implementation by using the new compat_ptr_ioctl()
> helper function that will do the right thing for all calls
> here.
> 
> Note that WIOCSTART/WIOCSTOP don't take any arguments, so
> the compat_ptr() conversion is not needed here, but it also
> doesn't hurt.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

Re: [PATCH v5 06/18] compat_ioctl: move WDIOC handling into wdt drivers

[Guenter Roeck]

On Wed, Aug 14, 2019 at 10:49:18PM +0200, Arnd Bergmann wrote:
> All watchdog drivers implement the same set of ioctl commands, and
> fortunately all of them are compatible between 32-bit and 64-bit
> architectures.
> 
> Modern drivers always go through drivers/watchdog/wdt.c as an abstraction
> layer, but older ones implement their own file_operations on a character
> device for this.
> 
> Move the handling from fs/compat_ioctl.c into the individual drivers.
> 
> Note that most of the legacy drivers will never be used on 64-bit
> hardware, because they are for an old 32-bit SoC implementation, but
> doing them all at once is safer than trying to guess which ones do
> or do not need the compat_ioctl handling.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

This patch doesn't seem to have a useful base (or at least git says so).
It does not apply to mainline nor to my own watchdog-next branch.
I assume you plan to apply the entire series together. Please not
that there will be conflicts against watchdog-next when you do so.

Guenter

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Arnd Bergmann]

On Thu, Aug 15, 2019 at 4:04 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Thu, Aug 15, 2019 at 10:15:12PM +1000, Dave Chinner wrote:
> > > http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table
> >
> > Lots to like in that handful of patches. :)
> >
> > It can easily go before or after Arnd's patch, and the merge
> > conflict either way would be minor, so I'm not really fussed either
> > way this gets sorted out...
>
> The other thing we could do is to just pick the two important ones:
>
> http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table-5.3
>
> and throw that into Arnds series, or even 5.3, and then defer the
> table thing until later.

If we can have your "xfs: fall back to native ioctls for unhandled compat
ones" in 5.3, that would be ideal from my side, then I can just drop the
corresponding patch from my series and have the rest merged for 5.4.

The compat_ptr addition is independent of my series, I just added it
because I noticed it was missing, so we can merged that through
the xfs tree along with your other changes, either for 5.3 or 5.4.

     Arnd

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Darrick J. Wong]

On Thu, Aug 15, 2019 at 09:20:32PM +0200, Arnd Bergmann wrote:
> On Thu, Aug 15, 2019 at 4:04 PM Christoph Hellwig <hch@infradead.org> wrote:
> >
> > On Thu, Aug 15, 2019 at 10:15:12PM +1000, Dave Chinner wrote:
> > > > http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table
> > >
> > > Lots to like in that handful of patches. :)
> > >
> > > It can easily go before or after Arnd's patch, and the merge
> > > conflict either way would be minor, so I'm not really fussed either
> > > way this gets sorted out...
> >
> > The other thing we could do is to just pick the two important ones:
> >
> > http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table-5.3
> >
> > and throw that into Arnds series, or even 5.3, and then defer the
> > table thing until later.
> 
> If we can have your "xfs: fall back to native ioctls for unhandled compat
> ones" in 5.3, that would be ideal from my side, then I can just drop the
> corresponding patch from my series and have the rest merged for 5.4.
> 
> The compat_ptr addition is independent of my series, I just added it
> because I noticed it was missing, so we can merged that through
> the xfs tree along with your other changes, either for 5.3 or 5.4.

Er... do the two patches in the -5.3 branch actually fix something
that's broken?  I sense s390 is missing a pointer sanitization check or
something...?

--D

>      Arnd

Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

[Arnd Bergmann]

On Thu, Aug 15, 2019 at 9:28 PM Darrick J. Wong <darrick.wong@oracle.com> wrote:
>
> On Thu, Aug 15, 2019 at 09:20:32PM +0200, Arnd Bergmann wrote:
> > On Thu, Aug 15, 2019 at 4:04 PM Christoph Hellwig <hch@infradead.org> wrote:
> > >
> > > On Thu, Aug 15, 2019 at 10:15:12PM +1000, Dave Chinner wrote:
> > > > > http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table
> > > >
> > > > Lots to like in that handful of patches. :)
> > > >
> > > > It can easily go before or after Arnd's patch, and the merge
> > > > conflict either way would be minor, so I'm not really fussed either
> > > > way this gets sorted out...
> > >
> > > The other thing we could do is to just pick the two important ones:
> > >
> > > http://git.infradead.org/users/hch/xfs.git/shortlog/refs/heads/xfs-ioctl-table-5.3
> > >
> > > and throw that into Arnds series, or even 5.3, and then defer the
> > > table thing until later.
> >
> > If we can have your "xfs: fall back to native ioctls for unhandled compat
> > ones" in 5.3, that would be ideal from my side, then I can just drop the
> > corresponding patch from my series and have the rest merged for 5.4.
> >
> > The compat_ptr addition is independent of my series, I just added it
> > because I noticed it was missing, so we can merged that through
> > the xfs tree along with your other changes, either for 5.3 or 5.4.
>
> Er... do the two patches in the -5.3 branch actually fix something
> that's broken?  I sense s390 is missing a pointer sanitization check or
> something...?

s390 is indeed missing the pointer conversion, the other patch
adds compat ioctl support for FS_IOC_GETFSLABEL and
FS_IOC_SETFSLABEL, which were missing, and it ensures that
FITRIM keeps working after I remove it from the list in
fs/compat_ioctl.c

       Arnd

Re: [PATCH v5 03/18] gfs2: add compat_ioctl support

[Andreas Gruenbacher]

Arnd,

On Wed, Aug 14, 2019 at 10:45 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> Out of the four ioctl commands supported on gfs2, only FITRIM
> works in compat mode.
>
> Add a proper handler based on the ext4 implementation.
>
> Fixes: 6ddc5c3ddf25 ("gfs2: getlabel support")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  fs/gfs2/file.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index 52fa1ef8400b..49287f0b96d0 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -6,6 +6,7 @@
>
>  #include <linux/slab.h>
>  #include <linux/spinlock.h>
> +#include <linux/compat.h>
>  #include <linux/completion.h>
>  #include <linux/buffer_head.h>
>  #include <linux/pagemap.h>
> @@ -354,6 +355,25 @@ static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>         return -ENOTTY;
>  }
>
> +#ifdef CONFIG_COMPAT
> +static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> +{
> +       /* These are just misnamed, they actually get/put from/to user an int */
> +       switch(cmd) {
> +       case FS_IOC32_GETFLAGS:
> +               cmd = FS_IOC_GETFLAGS;
> +               break;
> +       case FS_IOC32_SETFLAGS:
> +               cmd = FS_IOC_SETFLAGS;
> +               break;

I'd like the code to be more explicit here:

        case FITRIM:
        case FS_IOC_GETFSLABEL:
              break;
        default:
              return -ENOIOCTLCMD;

> +       }
> +
> +       return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
> +}
> +#else
> +#define gfs2_compat_ioctl NULL
> +#endif
> +
>  /**
>   * gfs2_size_hint - Give a hint to the size of a write request
>   * @filep: The struct file
> @@ -1294,6 +1314,7 @@ const struct file_operations gfs2_file_fops = {
>         .write_iter     = gfs2_file_write_iter,
>         .iopoll         = iomap_dio_iopoll,
>         .unlocked_ioctl = gfs2_ioctl,
> +       .compat_ioctl   = gfs2_compat_ioctl,
>         .mmap           = gfs2_mmap,
>         .open           = gfs2_open,
>         .release        = gfs2_release,
> @@ -1309,6 +1330,7 @@ const struct file_operations gfs2_file_fops = {
>  const struct file_operations gfs2_dir_fops = {
>         .iterate_shared = gfs2_readdir,
>         .unlocked_ioctl = gfs2_ioctl,
> +       .compat_ioctl   = gfs2_compat_ioctl,
>         .open           = gfs2_open,
>         .release        = gfs2_release,
>         .fsync          = gfs2_fsync,
> @@ -1325,6 +1347,7 @@ const struct file_operations gfs2_file_fops_nolock = {
>         .write_iter     = gfs2_file_write_iter,
>         .iopoll         = iomap_dio_iopoll,
>         .unlocked_ioctl = gfs2_ioctl,
> +       .compat_ioctl   = gfs2_compat_ioctl,
>         .mmap           = gfs2_mmap,
>         .open           = gfs2_open,
>         .release        = gfs2_release,
> @@ -1338,6 +1361,7 @@ const struct file_operations gfs2_file_fops_nolock = {
>  const struct file_operations gfs2_dir_fops_nolock = {
>         .iterate_shared = gfs2_readdir,
>         .unlocked_ioctl = gfs2_ioctl,
> +       .compat_ioctl   = gfs2_compat_ioctl,
>         .open           = gfs2_open,
>         .release        = gfs2_release,
>         .fsync          = gfs2_fsync,
> --
> 2.20.0
>

Should we feed this through the gfs2 tree?

Thanks,
Andreas

Re: [PATCH v5 03/18] gfs2: add compat_ioctl support

[Arnd Bergmann]

On Fri, Aug 16, 2019 at 7:32 PM Andreas Gruenbacher <agruenba@redhat.com> wrote:
>
> On Wed, Aug 14, 2019 at 10:45 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > +       /* These are just misnamed, they actually get/put from/to user an int */
> > +       switch(cmd) {
> > +       case FS_IOC32_GETFLAGS:
> > +               cmd = FS_IOC_GETFLAGS;
> > +               break;
> > +       case FS_IOC32_SETFLAGS:
> > +               cmd = FS_IOC_SETFLAGS;
> > +               break;
>
> I'd like the code to be more explicit here:
>
>         case FITRIM:
>         case FS_IOC_GETFSLABEL:
>               break;
>         default:
>               return -ENOIOCTLCMD;

I've looked at it again: if we do this, the function actually becomes
longer than
the native gfs2_ioctl(). Should we just make a full copy then?

static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
        switch(cmd) {
        case FS_IOC32_GETFLAGS:
                return gfs2_get_flags(filp, (u32 __user *)arg);
        case FS_IOC32_SETFLAGS:
                return gfs2_set_flags(filp, (u32 __user *)arg);
        case FITRIM:
                return gfs2_fitrim(filp, (void __user *)arg);
        case FS_IOC_GETFSLABEL:
                return gfs2_getlabel(filp, (char __user *)arg);
        }

        return -ENOTTY;
}

> Should we feed this through the gfs2 tree?

A later patch that removes the FITRIM handling from fs/compat_ioctl.c
depends on it, so I'd like to keep everything together.

         Arnd

Re: [PATCH v5 03/18] gfs2: add compat_ioctl support

[Andreas Grünbacher]

Am So., 18. Aug. 2019 um 21:32 Uhr schrieb Arnd Bergmann <arnd@arndb.de>:
> On Fri, Aug 16, 2019 at 7:32 PM Andreas Gruenbacher <agruenba@redhat.com> wrote:
> > On Wed, Aug 14, 2019 at 10:45 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > > +       /* These are just misnamed, they actually get/put from/to user an int */
> > > +       switch(cmd) {
> > > +       case FS_IOC32_GETFLAGS:
> > > +               cmd = FS_IOC_GETFLAGS;
> > > +               break;
> > > +       case FS_IOC32_SETFLAGS:
> > > +               cmd = FS_IOC_SETFLAGS;
> > > +               break;
> >
> > I'd like the code to be more explicit here:
> >
> >         case FITRIM:
> >         case FS_IOC_GETFSLABEL:
> >               break;
> >         default:
> >               return -ENOIOCTLCMD;
>
> I've looked at it again: if we do this, the function actually becomes
> longer than the native gfs2_ioctl(). Should we just make a full copy then?

I don't think the length of gfs2_compat_ioctl is really an issue as
long as the function is that simple.

> static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd,
> unsigned long arg)
> {
>         switch(cmd) {
>         case FS_IOC32_GETFLAGS:
>                 return gfs2_get_flags(filp, (u32 __user *)arg);
>         case FS_IOC32_SETFLAGS:
>                 return gfs2_set_flags(filp, (u32 __user *)arg);
>         case FITRIM:
>                 return gfs2_fitrim(filp, (void __user *)arg);
>         case FS_IOC_GETFSLABEL:
>                 return gfs2_getlabel(filp, (char __user *)arg);
>         }
>
>         return -ENOTTY;
> }

Don't we still need the compat_ptr conversion? That seems to be the
main point of having a compat_ioctl operation.

> > Should we feed this through the gfs2 tree?
>
> A later patch that removes the FITRIM handling from fs/compat_ioctl.c
> depends on it, so I'd like to keep everything together.

Ok, fine for me.

Thanks,
Andreas

Re: [PATCH v5 03/18] gfs2: add compat_ioctl support

[Arnd Bergmann]

On Sun, Aug 18, 2019 at 10:17 PM Andreas Grünbacher
<andreas.gruenbacher@gmail.com> wrote:
> Am So., 18. Aug. 2019 um 21:32 Uhr schrieb Arnd Bergmann <arnd@arndb.de>:
> > On Fri, Aug 16, 2019 at 7:32 PM Andreas Gruenbacher <agruenba@redhat.com> wrote:
> > > On Wed, Aug 14, 2019 at 10:45 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > > > +       /* These are just misnamed, they actually get/put from/to user an int */
> > > > +       switch(cmd) {
> > > > +       case FS_IOC32_GETFLAGS:
> > > > +               cmd = FS_IOC_GETFLAGS;
> > > > +               break;
> > > > +       case FS_IOC32_SETFLAGS:
> > > > +               cmd = FS_IOC_SETFLAGS;
> > > > +               break;
> > >
> > > I'd like the code to be more explicit here:
> > >
> > >         case FITRIM:
> > >         case FS_IOC_GETFSLABEL:
> > >               break;
> > >         default:
> > >               return -ENOIOCTLCMD;
> >
> > I've looked at it again: if we do this, the function actually becomes
> > longer than the native gfs2_ioctl(). Should we just make a full copy then?
>
> I don't think the length of gfs2_compat_ioctl is really an issue as
> long as the function is that simple.

True. The most important goal should just be to make it easy to
add the correct handler the next time another command is added
to the ioctl function.

Just let me know which version you want for that:

1. my original patch
2. the version from your reply
3. my version below with compat_ptr() added
4. ...

> > static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd,
> > unsigned long arg)
> > {
> >         switch(cmd) {
> >         case FS_IOC32_GETFLAGS:
> >                 return gfs2_get_flags(filp, (u32 __user *)arg);
> >         case FS_IOC32_SETFLAGS:
> >                 return gfs2_set_flags(filp, (u32 __user *)arg);
> >         case FITRIM:
> >                 return gfs2_fitrim(filp, (void __user *)arg);
> >         case FS_IOC_GETFSLABEL:
> >                 return gfs2_getlabel(filp, (char __user *)arg);
> >         }
> >
> >         return -ENOTTY;
> > }
>
> Don't we still need the compat_ptr conversion? That seems to be the
> main point of having a compat_ioctl operation.

Right, of course. Fixed now in my tree.

         Arnd

Re: [PATCH v5 03/18] gfs2: add compat_ioctl support

[Andreas Gruenbacher]

On Mon, Aug 19, 2019 at 11:09 AM Arnd Bergmann <arnd@arndb.de> wrote:
> On Sun, Aug 18, 2019 at 10:17 PM Andreas Grünbacher
> <andreas.gruenbacher@gmail.com> wrote:
> > Am So., 18. Aug. 2019 um 21:32 Uhr schrieb Arnd Bergmann <arnd@arndb.de>:
> > > On Fri, Aug 16, 2019 at 7:32 PM Andreas Gruenbacher <agruenba@redhat.com> wrote:
> > > > On Wed, Aug 14, 2019 at 10:45 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > > > > +       /* These are just misnamed, they actually get/put from/to user an int */
> > > > > +       switch(cmd) {
> > > > > +       case FS_IOC32_GETFLAGS:
> > > > > +               cmd = FS_IOC_GETFLAGS;
> > > > > +               break;
> > > > > +       case FS_IOC32_SETFLAGS:
> > > > > +               cmd = FS_IOC_SETFLAGS;
> > > > > +               break;
> > > >
> > > > I'd like the code to be more explicit here:
> > > >
> > > >         case FITRIM:
> > > >         case FS_IOC_GETFSLABEL:
> > > >               break;
> > > >         default:
> > > >               return -ENOIOCTLCMD;
> > >
> > > I've looked at it again: if we do this, the function actually becomes
> > > longer than the native gfs2_ioctl(). Should we just make a full copy then?
> >
> > I don't think the length of gfs2_compat_ioctl is really an issue as
> > long as the function is that simple.
>
> True. The most important goal should just be to make it easy to
> add the correct handler the next time another command is added
> to the ioctl function.
>
> Just let me know which version you want for that:
>
> 1. my original patch
> 2. the version from your reply

That one, please.

> 3. my version below with compat_ptr() added
> 4. ...
>
> > > static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd,
> > > unsigned long arg)
> > > {
> > >         switch(cmd) {
> > >         case FS_IOC32_GETFLAGS:
> > >                 return gfs2_get_flags(filp, (u32 __user *)arg);
> > >         case FS_IOC32_SETFLAGS:
> > >                 return gfs2_set_flags(filp, (u32 __user *)arg);
> > >         case FITRIM:
> > >                 return gfs2_fitrim(filp, (void __user *)arg);
> > >         case FS_IOC_GETFSLABEL:
> > >                 return gfs2_getlabel(filp, (char __user *)arg);
> > >         }
> > >
> > >         return -ENOTTY;
> > > }
> >
> > Don't we still need the compat_ptr conversion? That seems to be the
> > main point of having a compat_ioctl operation.
>
> Right, of course. Fixed now in my tree.
>
>          Arnd

Thanks,
Andreas

Re: [PATCH v5 05/18] watchdog: cpwd: use generic compat_ptr_ioctl

[Guenter Roeck]

Arnd,

On Wed, Aug 14, 2019 at 10:42:32PM +0200, Arnd Bergmann wrote:
> The cpwd_compat_ioctl() contains a bogus mutex that dates
> back to a leftover BKL instance.
> 
> Simplify the implementation by using the new compat_ptr_ioctl()
> helper function that will do the right thing for all calls
> here.
> 
> Note that WIOCSTART/WIOCSTOP don't take any arguments, so
> the compat_ptr() conversion is not needed here, but it also
> doesn't hurt.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>

This patch made it into the kernel, but the infrastructure didn't make it.
Do we need to revert it ?

Guenter

> ---
>  drivers/watchdog/cpwd.c | 25 +------------------------
>  1 file changed, 1 insertion(+), 24 deletions(-)
> 
> diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
> index b973b31179df..9393be584e72 100644
> --- a/drivers/watchdog/cpwd.c
> +++ b/drivers/watchdog/cpwd.c
> @@ -473,29 +473,6 @@ static long cpwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  	return 0;
>  }
>  
> -static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
> -			      unsigned long arg)
> -{
> -	int rval = -ENOIOCTLCMD;
> -
> -	switch (cmd) {
> -	/* solaris ioctls are specific to this driver */
> -	case WIOCSTART:
> -	case WIOCSTOP:
> -	case WIOCGSTAT:
> -		mutex_lock(&cpwd_mutex);
> -		rval = cpwd_ioctl(file, cmd, arg);
> -		mutex_unlock(&cpwd_mutex);
> -		break;
> -
> -	/* everything else is handled by the generic compat layer */
> -	default:
> -		break;
> -	}
> -
> -	return rval;
> -}
> -
>  static ssize_t cpwd_write(struct file *file, const char __user *buf,
>  			  size_t count, loff_t *ppos)
>  {
> @@ -520,7 +497,7 @@ static ssize_t cpwd_read(struct file *file, char __user *buffer,
>  static const struct file_operations cpwd_fops = {
>  	.owner =		THIS_MODULE,
>  	.unlocked_ioctl =	cpwd_ioctl,
> -	.compat_ioctl =		cpwd_compat_ioctl,
> +	.compat_ioctl =		compat_ptr_ioctl,
>  	.open =			cpwd_open,
>  	.write =		cpwd_write,
>  	.read =			cpwd_read,

Re: [PATCH v5 05/18] watchdog: cpwd: use generic compat_ptr_ioctl

[Arnd Bergmann]

On Tue, Oct 8, 2019 at 1:30 AM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On Wed, Aug 14, 2019 at 10:42:32PM +0200, Arnd Bergmann wrote:
> > The cpwd_compat_ioctl() contains a bogus mutex that dates
> > back to a leftover BKL instance.
> >
> > Simplify the implementation by using the new compat_ptr_ioctl()
> > helper function that will do the right thing for all calls
> > here.
> >
> > Note that WIOCSTART/WIOCSTOP don't take any arguments, so
> > the compat_ptr() conversion is not needed here, but it also
> > doesn't hurt.
> >
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > Reviewed-by: Guenter Roeck <linux@roeck-us.net>
>
> This patch made it into the kernel, but the infrastructure didn't make it.
> Do we need to revert it ?

Sorry I had not realized that this patch got queued in the watchdog tree
and relied on the other patches. I ended up not sending the series after
a runtime regression in another driver, combined with the series not
having spent much time in linux-next before the merge window.

I've sent a fixup patch now that will make it do the right thing
regardless of my series, please apply that for v5.4.

        Arnd