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| author |   Arnd Bergmann <arnd@arndb.de> | 2021-07-27 15:45:01 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-07-27 20:11:44 +0100 |
| commit | 76b5878cffab379dd4fd84c04bdf20d21177729d (patch) | |
| tree | bbccab3b97d1853fe101be1b3df14790a381eebe /drivers/net/slip/slip.c | |
| parent | net: usb: use ndo_siocdevprivate (diff) | |
| download | linux-dev-76b5878cffab379dd4fd84c04bdf20d21177729d.tar.xz linux-dev-76b5878cffab379dd4fd84c04bdf20d21177729d.zip | |
slip/plip: use ndo_siocdevprivate
slip and plip both use a couple of SIOCDEVPRIVATE ioctl
commands that overload the ifreq layout in a way that is
incompatible with compat mode.
Convert to use ndo_siocdevprivate to allow passing the
data this way, but return an error in compat mode anyway
because the private structure is still incompatible.
This could be fixed as well to make compat work properly.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/slip/slip.c')
| -rw-r--r-- | drivers/net/slip/slip.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c index dc84cb844319..5435b5689ce6 100644 --- a/drivers/net/slip/slip.c +++ b/drivers/net/slip/slip.c @@ -62,6 +62,7 @@ */ #define SL_CHECK_TRANSMIT +#include <linux/compat.h> #include <linux/module.h> #include <linux/moduleparam.h> @@ -108,7 +109,7 @@ static void slip_unesc6(struct slip *sl, unsigned char c); #ifdef CONFIG_SLIP_SMART static void sl_keepalive(struct timer_list *t); static void sl_outfill(struct timer_list *t); -static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); +static int sl_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd); #endif /******************************** @@ -647,7 +648,7 @@ static const struct net_device_ops sl_netdev_ops = { .ndo_change_mtu = sl_change_mtu, .ndo_tx_timeout = sl_tx_timeout, #ifdef CONFIG_SLIP_SMART - .ndo_do_ioctl = sl_ioctl, + .ndo_siocdevprivate = sl_siocdevprivate, #endif }; @@ -1179,11 +1180,12 @@ static int slip_ioctl(struct tty_struct *tty, struct file *file, /* VSV changes start here */ #ifdef CONFIG_SLIP_SMART -/* function do_ioctl called from net/core/dev.c +/* function sl_siocdevprivate called from net/core/dev.c to allow get/set outfill/keepalive parameter by ifconfig */ -static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +static int sl_siocdevprivate(struct net_device *dev, struct ifreq *rq, + void __user *data, int cmd) { struct slip *sl = netdev_priv(dev); unsigned long *p = (unsigned long *)&rq->ifr_ifru; @@ -1191,6 +1193,9 @@ static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) if (sl == NULL) /* Allocation failed ?? */ return -ENODEV; + if (in_compat_syscall()) + return -EOPNOTSUPP; + spin_lock_bh(&sl->lock); if (!sl->tty) { |