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Merge branch 'net-tunnel-name-validate'

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Eric Dumazet says:

====================
net: better validate user provided tunnel names

This series changes dev_valid_name() to not attempt reading
a possibly too long user-provided device name, then use
this helper in five different tunnel providers.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-04-05 15:16:15 -04:00
commit d68a19f89b
6 changed files with 30 additions and 19 deletions
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2
net/core/dev.c
View File

@ -1027,7 +1027,7 @@ bool dev_valid_name(const char *name)
{
if (*name == '\0')
return false;
if (strlen(name) >= IFNAMSIZ)
if (strnlen(name, IFNAMSIZ) == IFNAMSIZ)
return false;
if (!strcmp(name, ".") || !strcmp(name, ".."))
return false;

13
net/ipv4/ip_tunnel.c
View File

@ -253,13 +253,14 @@ static struct net_device *__ip_tunnel_create(struct net *net,
struct net_device *dev;
char name[IFNAMSIZ];
if (parms->name[0])
strlcpy(name, parms->name, IFNAMSIZ);
else {
if (strlen(ops->kind) > (IFNAMSIZ - 3)) {
err = -E2BIG;
err = -E2BIG;
if (parms->name[0]) {
if (!dev_valid_name(parms->name))
goto failed;
strlcpy(name, parms->name, IFNAMSIZ);
} else {
if (strlen(ops->kind) > (IFNAMSIZ - 3))
goto failed;
}
strlcpy(name, ops->kind, IFNAMSIZ);
strncat(name, "%d", 2);
}

8
net/ipv6/ip6_gre.c
View File

@ -335,11 +335,13 @@ static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
if (t || !create)
return t;
if (parms->name[0])
if (parms->name[0]) {
if (!dev_valid_name(parms->name))
return NULL;
strlcpy(name, parms->name, IFNAMSIZ);
else
} else {
strcpy(name, "ip6gre%d");
}
dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
ip6gre_tunnel_setup);
if (!dev)

11
net/ipv6/ip6_tunnel.c
View File

@ -297,13 +297,16 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
struct net_device *dev;
struct ip6_tnl *t;
char name[IFNAMSIZ];
int err = -ENOMEM;
int err = -E2BIG;
if (p->name[0])
if (p->name[0]) {
if (!dev_valid_name(p->name))
goto failed;
strlcpy(name, p->name, IFNAMSIZ);
else
} else {
sprintf(name, "ip6tnl%%d");
}
err = -ENOMEM;
dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
ip6_tnl_dev_setup);
if (!dev)

7
net/ipv6/ip6_vti.c
View File

@ -212,10 +212,13 @@ static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p
char name[IFNAMSIZ];
int err;
if (p->name[0])
if (p->name[0]) {
if (!dev_valid_name(p->name))
goto failed;
strlcpy(name, p->name, IFNAMSIZ);
else
} else {
sprintf(name, "ip6_vti%%d");
}
dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
if (!dev)

8
net/ipv6/sit.c
View File

@ -250,11 +250,13 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
if (!create)
goto failed;
if (parms->name[0])
if (parms->name[0]) {
if (!dev_valid_name(parms->name))
goto failed;
strlcpy(name, parms->name, IFNAMSIZ);
else
} else {
strcpy(name, "sit%d");
}
dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
ipip6_tunnel_setup);
if (!dev)