3.16.55-rc1 review patch. If anyone has any objections, please let me know.
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From: Herbert Xu herbert@gondor.apana.org.au
commit c008ba5bdc9fa830e1a349b20b0be5a137bdef7a upstream.
Ever since raw_probe_proto_opt was added it had the problem of causing the user iov to be read twice, once during the probe for the protocol header and once again in ip_append_data.
This is a potential security problem since it means that whatever we're probing may be invalid. This patch plugs the hole by firstly advancing the iov so we don't read the same spot again, and secondly saving what we read the first time around for use by ip_append_data.
Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Ben Hutchings ben@decadent.org.uk --- net/ipv4/raw.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 54 insertions(+), 8 deletions(-)
--- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -78,6 +78,16 @@ #include <linux/netfilter.h> #include <linux/netfilter_ipv4.h> #include <linux/compat.h> +#include <linux/uio.h> + +struct raw_frag_vec { + struct iovec *iov; + union { + struct icmphdr icmph; + char c[1]; + } hdr; + int hlen; +};
static struct raw_hashinfo raw_v4_hashinfo = { .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), @@ -415,25 +425,57 @@ error: return err; }
-static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg) +static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) { - struct icmphdr icmph; int err;
if (fl4->flowi4_proto != IPPROTO_ICMP) return 0;
/* We only need the first two bytes. */ - err = memcpy_fromiovecend((void *)&icmph, msg->msg_iov, 0, 2); + rfv->hlen = 2; + + err = memcpy_fromiovec(rfv->hdr.c, rfv->iov, rfv->hlen); if (err) return err;
- fl4->fl4_icmp_type = icmph.type; - fl4->fl4_icmp_code = icmph.code; + fl4->fl4_icmp_type = rfv->hdr.icmph.type; + fl4->fl4_icmp_code = rfv->hdr.icmph.code;
return 0; }
+static int raw_getfrag(void *from, char *to, int offset, int len, int odd, + struct sk_buff *skb) +{ + struct raw_frag_vec *rfv = from; + + if (offset < rfv->hlen) { + int copy = min(rfv->hlen - offset, len); + + if (skb->ip_summed == CHECKSUM_PARTIAL) + memcpy(to, rfv->hdr.c + offset, copy); + else + skb->csum = csum_block_add( + skb->csum, + csum_partial_copy_nocheck(rfv->hdr.c + offset, + to, copy, 0), + odd); + + odd = 0; + offset += copy; + to += copy; + len -= copy; + + if (!len) + return 0; + } + + offset -= rfv->hlen; + + return ip_generic_getfrag(rfv->iov, to, offset, len, odd, skb); +} + static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) { @@ -447,6 +489,7 @@ static int raw_sendmsg(struct kiocb *ioc u8 tos; int err; struct ip_options_data opt_copy; + struct raw_frag_vec rfv;
err = -EMSGSIZE; if (len > 0xFFFF) @@ -554,7 +597,10 @@ static int raw_sendmsg(struct kiocb *ioc daddr, saddr, 0, 0);
if (!inet->hdrincl) { - err = raw_probe_proto_opt(&fl4, msg); + rfv.iov = msg->msg_iov; + rfv.hlen = 0; + + err = raw_probe_proto_opt(&rfv, &fl4); if (err) goto done; } @@ -583,8 +629,8 @@ back_from_confirm: if (!ipc.addr) ipc.addr = fl4.daddr; lock_sock(sk); - err = ip_append_data(sk, &fl4, ip_generic_getfrag, - msg->msg_iov, len, 0, + err = ip_append_data(sk, &fl4, raw_getfrag, + &rfv, len, 0, &ipc, &rt, msg->msg_flags); if (err) ip_flush_pending_frames(sk);