From: Willem de Bruijn Date: Thu, 10 Mar 2016 02:58:32 +0000 (-0500) Subject: net: validate variable length ll headers X-Git-Tag: v3.2.80~12 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=b5518429e70cd783b8ca52335456172c1a0589f6 net: validate variable length ll headers [ Upstream commit 2793a23aacbd754dbbb5cb75093deb7e4103bace ] Netdevice parameter hard_header_len is variously interpreted both as an upper and lower bound on link layer header length. The field is used as upper bound when reserving room at allocation, as lower bound when validating user input in PF_PACKET. Clarify the definition to be maximum header length. For validation of untrusted headers, add an optional validate member to header_ops. Allow bypassing of validation by passing CAP_SYS_RAWIO, for instance for deliberate testing of corrupt input. In this case, pad trailing bytes, as some device drivers expect completely initialized headers. See also http://comments.gmane.org/gmane.linux.network/401064 Signed-off-by: Willem de Bruijn Signed-off-by: David S. Miller [bwh: Backported to 3.2: net_device has inline comments instead of kernel-doc] Signed-off-by: Ben Hutchings --- diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 4b04097c748c..700c94821db1 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -293,6 +293,7 @@ struct header_ops { void (*cache_update)(struct hh_cache *hh, const struct net_device *dev, const unsigned char *haddr); + bool (*validate)(const char *ll_header, unsigned int len); }; /* These flag bits are private to the generic network queueing @@ -1119,7 +1120,7 @@ struct net_device { unsigned int mtu; /* interface MTU value */ unsigned short type; /* interface hardware type */ - unsigned short hard_header_len; /* hardware hdr length */ + unsigned short hard_header_len; /* maximum hardware hdr length */ /* extra head- and tailroom the hardware may need, but not in all cases * can this be guaranteed, especially tailroom. Some cases also use @@ -1728,6 +1729,24 @@ static inline int dev_rebuild_header(struct sk_buff *skb) return dev->header_ops->rebuild(skb); } +/* ll_header must have at least hard_header_len allocated */ +static inline bool dev_validate_header(const struct net_device *dev, + char *ll_header, int len) +{ + if (likely(len >= dev->hard_header_len)) + return true; + + if (capable(CAP_SYS_RAWIO)) { + memset(ll_header + len, 0, dev->hard_header_len - len); + return true; + } + + if (dev->header_ops && dev->header_ops->validate) + return dev->header_ops->validate(ll_header, len); + + return false; +} + typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); static inline int unregister_gifconf(unsigned int family)