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authorMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>2016-03-08 10:34:28 -0300
committerDavid S. Miller <davem@davemloft.net>2016-03-08 15:04:08 -0500
commit133800d1f0288b9ddfc0d0aded10d9efa82d5b8c (patch)
treefa156a2753d1c80c12910790cb12ddf6db7da30b /net/sctp
parente2857b8f11a289ed2b61d18d0665e05c1053c446 (diff)
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sctp: fix copying more bytes than expected in sctp_add_bind_addr
Dmitry reported that sctp_add_bind_addr may read more bytes than expected in case the parameter is a IPv4 addr supplied by the user through calls such as sctp_bindx_add(), because it always copies sizeof(union sctp_addr) while the buffer may be just a struct sockaddr_in, which is smaller. This patch then fixes it by limiting the memcpy to the min between the union size and a (new parameter) provided addr size. Where possible this parameter still is the size of that union, except for reading from user-provided buffers, which then it accounts for protocol type. Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/bind_addr.c14
-rw-r--r--net/sctp/protocol.c1
-rw-r--r--net/sctp/sm_make_chunk.c3
-rw-r--r--net/sctp/socket.c4
4 files changed, 14 insertions, 8 deletions
diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index 871cdf9567e6..401c60750b20 100644
--- a/net/sctp/bind_addr.c
+++ b/net/sctp/bind_addr.c
@@ -111,7 +111,8 @@ int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
dest->port = src->port;
list_for_each_entry(addr, &src->address_list, list) {
- error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
+ error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a),
+ 1, gfp);
if (error < 0)
break;
}
@@ -150,7 +151,7 @@ void sctp_bind_addr_free(struct sctp_bind_addr *bp)
/* Add an address to the bind address list in the SCTP_bind_addr structure. */
int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
- __u8 addr_state, gfp_t gfp)
+ int new_size, __u8 addr_state, gfp_t gfp)
{
struct sctp_sockaddr_entry *addr;
@@ -159,7 +160,7 @@ int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
if (!addr)
return -ENOMEM;
- memcpy(&addr->a, new, sizeof(*new));
+ memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size));
/* Fix up the port if it has not yet been set.
* Both v4 and v6 have the port at the same offset.
@@ -291,7 +292,8 @@ int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
}
af->from_addr_param(&addr, rawaddr, htons(port), 0);
- retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
+ retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
+ SCTP_ADDR_SRC, gfp);
if (retval) {
/* Can't finish building the list, clean up. */
sctp_bind_addr_clean(bp);
@@ -453,8 +455,8 @@ static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
(((AF_INET6 == addr->sa.sa_family) &&
(flags & SCTP_ADDR6_ALLOWED) &&
(flags & SCTP_ADDR6_PEERSUPP))))
- error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
- gfp);
+ error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
+ SCTP_ADDR_SRC, gfp);
}
return error;
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 1099e99a53c4..d3d50daa248b 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -216,6 +216,7 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
(copy_flags & SCTP_ADDR6_ALLOWED) &&
(copy_flags & SCTP_ADDR6_PEERSUPP)))) {
error = sctp_add_bind_addr(bp, &addr->a,
+ sizeof(addr->a),
SCTP_ADDR_SRC, GFP_ATOMIC);
if (error)
goto end_copy;
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 5d6a03fad378..7fe971e30ad6 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1830,7 +1830,8 @@ no_hmac:
/* Also, add the destination address. */
if (list_empty(&retval->base.bind_addr.address_list)) {
sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
- SCTP_ADDR_SRC, GFP_ATOMIC);
+ sizeof(chunk->dest), SCTP_ADDR_SRC,
+ GFP_ATOMIC);
}
retval->next_tsn = retval->c.initial_tsn;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e878da0949db..0e3de0c71137 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -386,7 +386,8 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
/* Add the address to the bind address list.
* Use GFP_ATOMIC since BHs will be disabled.
*/
- ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
+ ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
+ SCTP_ADDR_SRC, GFP_ATOMIC);
/* Copy back into socket for getsockname() use. */
if (!ret) {
@@ -577,6 +578,7 @@ static int sctp_send_asconf_add_ip(struct sock *sk,
af = sctp_get_af_specific(addr->v4.sin_family);
memcpy(&saveaddr, addr, af->sockaddr_len);
retval = sctp_add_bind_addr(bp, &saveaddr,
+ sizeof(saveaddr),
SCTP_ADDR_NEW, GFP_ATOMIC);
addr_buf += af->sockaddr_len;
}