From: Jeff Mahoney <jeffm@xxxxxxxx>
This patch adds a module parameter to allow a group access to the
mISDN devices. Otherwise, unpriviledged users on systems with ISDN
hardware have the ability to dial out, potentially causing expensive
bills.
Based on a different implementation by Patrick Koppen <isdn4linux@xxxxxxxxx>
Acked-by: Jeff Mahoney <jeffm@xxxxxxxx>
Cc: Patrick Koppen <isdn4linux@xxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Karsten Keil <isdn@xxxxxxxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
---
drivers/isdn/mISDN/core.c | 3 +++
drivers/isdn/mISDN/core.h | 1 +
drivers/isdn/mISDN/socket.c | 8 ++++++++
3 files changed, 12 insertions(+)
diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
index e47dcb9..71f4986 100644
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -612,6 +612,10 @@ data_sock_create(struct net *net, struct socket *sock, int protocol)
{
struct sock *sk;
+ if(!capable(CAP_SYS_ADMIN) && (misdn_permitted_gid != current_gid())
@@ -694,6 +698,10 @@ base_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
case IMSETDEVNAME:
{
struct mISDN_devrename dn;
+ if(!capable(CAP_SYS_ADMIN)
+ && (misdn_permitted_gid != current_gid())
+ && (!in_group_p(misdn_permitted_gid)))