sctp: use memdup_user instead of vmemdup_user

In sctp_setsockopt_bindx()/__sctp_setsockopt_connectx(), it allocates
memory with addrs_size which is passed from userspace. We used flag
GFP_USER to put some more restrictions on it in Commit cacc06215271
("sctp: use GFP_USER for user-controlled kmalloc").

However, since Commit c981f254cc82 ("sctp: use vmemdup_user() rather
than badly open-coding memdup_user()"), vmemdup_user() has been used,
which doesn't check GFP_USER flag when goes to vmalloc_*(). So when
addrs_size is a huge value, it could exhaust memory and even trigger
oom killer.

This patch is to use memdup_user() instead, in which GFP_USER would
work to limit the memory allocation with a huge addrs_size.

Note we can't fix it by limiting 'addrs_size', as there's no demand
for it from RFC.

Reported-by: syzbot+ec1b7575afef85a0e5ca@syzkaller.appspotmail.com
Fixes: c981f254cc82 ("sctp: use vmemdup_user() rather than badly open-coding memdup_user()")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 011c349..9874e60 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -999,7 +999,7 @@ static int sctp_setsockopt_bindx(struct sock *sk,
        if (unlikely(addrs_size <= 0))
                return -EINVAL;
 
-       kaddrs = vmemdup_user(addrs, addrs_size);
+       kaddrs = memdup_user(addrs, addrs_size);
        if (unlikely(IS_ERR(kaddrs)))
                return PTR_ERR(kaddrs);
 
@@ -1007,7 +1007,7 @@ static int sctp_setsockopt_bindx(struct sock *sk,
        addr_buf = kaddrs;
        while (walk_size < addrs_size) {
                if (walk_size + sizeof(sa_family_t) > addrs_size) {
-                       kvfree(kaddrs);
+                       kfree(kaddrs);
                        return -EINVAL;
                }
 
@@ -1018,7 +1018,7 @@ static int sctp_setsockopt_bindx(struct sock *sk,
                 * causes the address buffer to overflow return EINVAL.
                 */
                if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
-                       kvfree(kaddrs);
+                       kfree(kaddrs);
                        return -EINVAL;
                }
                addrcnt++;
@@ -1054,7 +1054,7 @@ static int sctp_setsockopt_bindx(struct sock *sk,
        }
 
 out:
-       kvfree(kaddrs);
+       kfree(kaddrs);
 
        return err;
 }
@@ -1329,7 +1329,7 @@ static int __sctp_setsockopt_connectx(struct sock *sk,
        if (unlikely(addrs_size <= 0))
                return -EINVAL;
 
-       kaddrs = vmemdup_user(addrs, addrs_size);
+       kaddrs = memdup_user(addrs, addrs_size);
        if (unlikely(IS_ERR(kaddrs)))
                return PTR_ERR(kaddrs);
 
@@ -1349,7 +1349,7 @@ static int __sctp_setsockopt_connectx(struct sock *sk,
        err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
 
 out_free:
-       kvfree(kaddrs);
+       kfree(kaddrs);
 
        return err;
 }