| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 1 Jul 2008 15:46:06 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: "Adam Langley" <agl@...erialviolet.org>
Cc: netdev@...r.kernel.org
Subject: Re: MD5 SG fix
On Tue, 1 Jul 2008 15:38:14 -0700
"Adam Langley" <agl@...erialviolet.org> wrote:
> Cut three,
> * I should use sg_set_page, not sg_set_buf with page_address
> * Make the version that tcp_output etc use take an SKB
> * Replicate fix to IPv6
>
> Cheers,
>
>
> AGL
>
> include/net/tcp.h | 6 +--
> net/ipv4/tcp_ipv4.c | 112 +++++++++++++++++++++++++++++++++++++------------
> net/ipv4/tcp_output.c | 11 ++---
> net/ipv6/tcp_ipv6.c | 65 ++++++++++++++++++----------
> 4 files changed, 133 insertions(+), 61 deletions(-)
>
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 633147c..a9130a1 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -1120,9 +1120,8 @@ extern int tcp_v4_calc_md5_hash(char *md5_hash,
> struct sock *sk,
> struct dst_entry *dst,
> struct request_sock *req,
> - struct tcphdr *th,
> int protocol,
> - unsigned int tcplen);
> + struct sk_buff *skb);
> extern struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk,
> struct sock *addr_sk);
>
> @@ -1370,9 +1369,8 @@ struct tcp_sock_af_ops {
> struct sock *sk,
> struct dst_entry *dst,
> struct request_sock *req,
> - struct tcphdr *th,
> int protocol,
> - unsigned int len);
> + struct sk_buff *skb);
> int (*md5_add) (struct sock *sk,
> struct sock *addr_sk,
> u8 *newkey,
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index cd601a8..90a5f41 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -95,8 +95,9 @@ static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk,
> __be32 addr);
> static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
> __be32 saddr, __be32 daddr,
> - struct tcphdr *th, int protocol,
> - unsigned int tcplen);
> + int protocol,
> + struct tcphdr *th, int data_off, int tcplen,
> + struct skb_shared_info *frags);
> #endif
>
> struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
> @@ -586,8 +587,9 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
> key,
> ip_hdr(skb)->daddr,
> ip_hdr(skb)->saddr,
> - &rep.th, IPPROTO_TCP,
> - arg.iov[0].iov_len);
> + IPPROTO_TCP, &rep.th,
> + arg.iov[0].iov_len, arg.iov[0].iov_len,
> + NULL);
> }
> #endif
> arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
> @@ -680,8 +682,9 @@ static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk,
> key,
> ip_hdr(skb)->daddr,
> ip_hdr(skb)->saddr,
> - &rep.th, IPPROTO_TCP,
> - arg.iov[0].iov_len);
> + IPPROTO_TCP, &rep.th,
> + arg.iov[0].iov_len, arg.iov[0].iov_len,
> + NULL);
> }
> #endif
> arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
> @@ -1004,20 +1007,56 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval,
> newkey, cmd.tcpm_keylen);
> }
>
> +/*
> +static void
> +md5_dump(struct scatterlist *sglist, int nsg, unsigned nbytes, int data_off, int tcplen, char frags) {
> + struct scatterlist *sg;
> + unsigned e;
> +
> + printk(KERN_INFO "MD5: %d %d %d %d %d\n", nsg, nbytes, data_off, tcplen, frags);
> + for_each_sg(sglist, sg, nsg, e) {
> + u8 *buf = sg_virt(sg);
> + unsigned i;
> +
> + for (i = 0; i < sg->length; ++i)
> + printk(" %02x", buf[i]);
> +
> + printk("\n");
> + }
> +
> + printk("\n");
> +}*/
> +
> +/**
> + * tcp_v4_do_calc_md5_hash - calculate an MD5 hash (RFC 2385)
> + * @md5_hash: (output) a 16 byte space into which the MD5 sig is written
> + * @key: the key that is appened to the hash input
> + * @saddr: source IP address for the packet
> + * @daddr: destination IP address for the packet
> + * @protocol: the protocol number in the IP header (see the RFC)
> + * @th: the TCP header, followed by options and (optional) data
> + * @data_off: the offset of the optional data (in bytes) from @th
> + * @tcplen: the length of the buffer (in bytes) pointed to by @th. If
> + * @tcplen == @data_off then there is no data following the header
> + * @frags: (maybe NULL) a list of additional fragments of data
> + *
> + * We don't always have the SKB when this function is called, thus the pointer
> + * to the TCP header and all the length arguments.
> + */
> static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
> - __be32 saddr, __be32 daddr,
> - struct tcphdr *th, int protocol,
> - unsigned int tcplen)
> + __be32 saddr, __be32 daddr, int protocol,
> + struct tcphdr *th, int data_off, int tcplen,
> + struct skb_shared_info *frags)
> {
> - struct scatterlist sg[4];
> - __u16 data_len;
> + struct scatterlist sg[MAX_SKB_FRAGS + 3];
Since this can be big, why not allocate with kmalloc()?
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists