netdev - [PATCH v3 15/26] compat_ioctl: move isdn/capi ioctl translation into driver

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Message-Id: <20190416202701.127745-4-arnd@arndb.de>
Date:   Tue, 16 Apr 2019 22:25:36 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     linux-fsdevel@...r.kernel.org, y2038@...ts.linaro.org,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Karsten Keil <isdn@...ux-pingi.de>,
        Kees Cook <keescook@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Randy Dunlap <rdunlap@...radead.org>, netdev@...r.kernel.org
Subject: [PATCH v3 15/26] compat_ioctl: move isdn/capi ioctl translation into driver

Neither the old isdn4linux interface nor the newer mISDN stack
ever had working 32-bit compat mode as far as I can tell.

However, the CAPI stack has some ioctl commands that are
correctly listed in fs/compat_ioctl.c.

We can trivially move all of those into the corresponding
file that implement the native handlers by adding a compat_ioctl
redirect to that.

I did notice that treating CAPI_MANUFACTURER_CMD() as compatible
is broken, so I'm also adding a handler for that, realizing that
in all likelyhood, nobody is ever going to call it.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/isdn/capi/capi.c | 31 +++++++++++++++++++++++++++++++
 fs/compat_ioctl.c        | 17 -----------------
 2 files changed, 31 insertions(+), 17 deletions(-)

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index e1da70a9530c..744cfdeb9ecf 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -942,6 +942,34 @@ capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+static long
+capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	if (cmd == CAPI_MANUFACTURER_CMD) {
+		struct {
+			unsigned long cmd;
+			compat_uptr_t data;
+		} mcmd32;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+		if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32)))
+			return -EFAULT;
+
+		mutex_lock(&capi_mutex);
+		ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data));
+		mutex_unlock(&capi_mutex);
+
+		return ret;
+	}
+
+	return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static int capi_open(struct inode *inode, struct file *file)
 {
 	struct capidev *cdev;
@@ -988,6 +1016,9 @@ static const struct file_operations capi_fops =
 	.write		= capi_write,
 	.poll		= capi_poll,
 	.unlocked_ioctl	= capi_unlocked_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= capi_compat_ioctl,
+#endif
 	.open		= capi_open,
 	.release	= capi_release,
 };
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index a0f230650de2..aad7071eaee0 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -44,9 +44,6 @@
 #include <net/bluetooth/hci_sock.h>
 #include <net/bluetooth/rfcomm.h>
 
-#include <linux/capi.h>
-#include <linux/gigaset_dev.h>
-
 #ifdef CONFIG_BLOCK
 #include <linux/cdrom.h>
 #include <linux/fd.h>
@@ -622,20 +619,6 @@ COMPATIBLE_IOCTL(RFCOMMRELEASEDEV)
 COMPATIBLE_IOCTL(RFCOMMGETDEVLIST)
 COMPATIBLE_IOCTL(RFCOMMGETDEVINFO)
 COMPATIBLE_IOCTL(RFCOMMSTEALDLC)
-/* CAPI */
-COMPATIBLE_IOCTL(CAPI_REGISTER)
-COMPATIBLE_IOCTL(CAPI_GET_MANUFACTURER)
-COMPATIBLE_IOCTL(CAPI_GET_VERSION)
-COMPATIBLE_IOCTL(CAPI_GET_SERIAL)
-COMPATIBLE_IOCTL(CAPI_GET_PROFILE)
-COMPATIBLE_IOCTL(CAPI_MANUFACTURER_CMD)
-COMPATIBLE_IOCTL(CAPI_GET_ERRCODE)
-COMPATIBLE_IOCTL(CAPI_INSTALLED)
-COMPATIBLE_IOCTL(CAPI_GET_FLAGS)
-COMPATIBLE_IOCTL(CAPI_SET_FLAGS)
-COMPATIBLE_IOCTL(CAPI_CLR_FLAGS)
-COMPATIBLE_IOCTL(CAPI_NCCI_OPENCOUNT)
-COMPATIBLE_IOCTL(CAPI_NCCI_GETUNIT)
 /* Misc. */
 COMPATIBLE_IOCTL(PCIIOC_CONTROLLER)
 COMPATIBLE_IOCTL(PCIIOC_MMAP_IS_IO)
-- 
2.20.0