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Date: Wed, 20 Mar 2013 14:38:40 -0700
From: Andy Lutomirski <luto@...capital.net>
To: netdev@...r.kernel.org
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
containers@...ts.linux-foundation.org,
Andy Lutomirski <luto@...capital.net>
Subject: [PATCH 3/3] net: Remove sock_iocb.scm
I'm not sure why this was here. Any use after sendmsg or recvmsg
returned was bogus anyway.
Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
include/net/sock.h | 1 -
net/netlink/af_netlink.c | 27 +++++++-------------
net/socket.c | 2 --
net/unix/af_unix.c | 66 ++++++++++++++++++------------------------------
4 files changed, 33 insertions(+), 63 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 14f6e9d..87b134e 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1299,7 +1299,6 @@ struct sock_iocb {
int size;
struct socket *sock;
struct sock *sk;
- struct scm_cookie *scm;
struct msghdr *msg, async_msg;
struct kiocb *kiocb;
};
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 8245f61..874bc1f 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1359,7 +1359,6 @@ static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
- struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
struct sock *sk = sock->sk;
struct netlink_sock *nlk = nlk_sk(sk);
struct sockaddr_nl *addr = msg->msg_name;
@@ -1372,11 +1371,8 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
if (msg->msg_flags&MSG_OOB)
return -EOPNOTSUPP;
- if (NULL == siocb->scm)
- siocb->scm = &scm;
-
- scm_creds_from_current(&siocb->scm->creds);
- err = scm_send(sock, msg, siocb->scm);
+ scm_creds_from_current(&scm.creds);
+ err = scm_send(sock, msg, &scm);
if (err < 0)
return err;
@@ -1413,7 +1409,7 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
NETLINK_CB(skb).dst_group = dst_group;
/* This is mandatory. See netlink_recvmsg. */
- NETLINK_CB(skb).creds = siocb->scm->creds;
+ NETLINK_CB(skb).creds = scm.creds;
err = -EFAULT;
if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
@@ -1434,7 +1430,7 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT);
out:
- scm_destroy(siocb->scm);
+ scm_destroy(&scm);
return err;
}
@@ -1442,8 +1438,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
struct msghdr *msg, size_t len,
int flags)
{
- struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
- struct scm_cookie scm;
+ struct scm_cookie scm = SCM_COOKIE_INIT;
struct sock *sk = sock->sk;
struct netlink_sock *nlk = nlk_sk(sk);
int noblock = flags&MSG_DONTWAIT;
@@ -1502,14 +1497,10 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
if (nlk->flags & NETLINK_RECV_PKTINFO)
netlink_cmsg_recv_pktinfo(msg, skb);
- if (NULL == siocb->scm) {
- memset(&scm, 0, sizeof(scm));
- siocb->scm = &scm;
- }
/* skbs without creds are from the kernel. */
- siocb->scm->creds = *NETLINK_CREDS(skb);
- if (!siocb->scm->creds.has_creds)
- scm_creds_from_kernel(&siocb->scm->creds);
+ scm.creds = *NETLINK_CREDS(skb);
+ if (!scm.creds.has_creds)
+ scm_creds_from_kernel(&scm.creds);
if (flags & MSG_TRUNC)
copied = data_skb->len;
@@ -1524,7 +1515,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
}
}
- scm_recv(sock, msg, siocb->scm, flags);
+ scm_recv(sock, msg, &scm, flags);
out:
netlink_rcv_wake(sk);
return err ? : copied;
diff --git a/net/socket.c b/net/socket.c
index 88f759a..26a65b4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -619,7 +619,6 @@ static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
struct sock_iocb *si = kiocb_to_siocb(iocb);
si->sock = sock;
- si->scm = NULL;
si->msg = msg;
si->size = size;
@@ -781,7 +780,6 @@ static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
struct sock_iocb *si = kiocb_to_siocb(iocb);
si->sock = sock;
- si->scm = NULL;
si->msg = msg;
si->size = size;
si->flags = flags;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 0881739..e6541c1 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1422,7 +1422,6 @@ static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock,
static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
- struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
struct unix_sock *u = unix_sk(sk);
@@ -1433,14 +1432,12 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
unsigned int hash;
struct sk_buff *skb;
long timeo;
- struct scm_cookie tmp_scm = SCM_COOKIE_INIT;
+ struct scm_cookie scm = SCM_COOKIE_INIT;
int max_level;
int data_len = 0;
- if (NULL == siocb->scm)
- siocb->scm = &tmp_scm;
wait_for_unix_gc();
- err = scm_send(sock, msg, siocb->scm);
+ err = scm_send(sock, msg, &scm);
if (err < 0)
return err;
@@ -1479,11 +1476,11 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
if (skb == NULL)
goto out;
- err = unix_scm_to_skb(siocb->scm, skb, true);
+ err = unix_scm_to_skb(&scm, skb, true);
if (err < 0)
goto out_free;
max_level = err + 1;
- unix_get_secdata(siocb->scm, skb);
+ unix_get_secdata(&scm, skb);
skb_put(skb, len - data_len);
skb->data_len = data_len;
@@ -1578,7 +1575,7 @@ restart:
unix_state_unlock(other);
other->sk_data_ready(other, len);
sock_put(other);
- scm_destroy(siocb->scm);
+ scm_destroy(&scm);
return len;
out_unlock:
@@ -1588,7 +1585,7 @@ out_free:
out:
if (other)
sock_put(other);
- scm_destroy(siocb->scm);
+ scm_destroy(&scm);
return err;
}
@@ -1596,20 +1593,17 @@ out:
static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
- struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
struct sock *sk = sock->sk;
struct sock *other = NULL;
int err, size;
struct sk_buff *skb;
int sent = 0;
- struct scm_cookie tmp_scm = SCM_COOKIE_INIT;
+ struct scm_cookie scm = SCM_COOKIE_INIT;
bool fds_sent = false;
int max_level;
- if (NULL == siocb->scm)
- siocb->scm = &tmp_scm;
wait_for_unix_gc();
- err = scm_send(sock, msg, siocb->scm);
+ err = scm_send(sock, msg, &scm);
if (err < 0)
return err;
@@ -1666,7 +1660,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
/* Only send the fds in the first buffer */
- err = unix_scm_to_skb(siocb->scm, skb, !fds_sent);
+ err = unix_scm_to_skb(&scm, skb, !fds_sent);
if (err < 0) {
kfree_skb(skb);
goto out_err;
@@ -1695,8 +1689,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
sent += size;
}
- scm_destroy(siocb->scm);
- siocb->scm = NULL;
+ scm_destroy(&scm);
return sent;
@@ -1708,8 +1701,7 @@ pipe_err:
send_sig(SIGPIPE, current, 0);
err = -EPIPE;
out_err:
- scm_destroy(siocb->scm);
- siocb->scm = NULL;
+ scm_destroy(&scm);
return sent ? : err;
}
@@ -1760,7 +1752,7 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
int flags)
{
struct sock_iocb *siocb = kiocb_to_siocb(iocb);
- struct scm_cookie tmp_scm = SCM_COOKIE_INIT;
+ struct scm_cookie scm = SCM_COOKIE_INIT;
struct sock *sk = sock->sk;
struct unix_sock *u = unix_sk(sk);
int noblock = flags & MSG_DONTWAIT;
@@ -1811,16 +1803,12 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
if (sock_flag(sk, SOCK_RCVTSTAMP))
__sock_recv_timestamp(msg, sk, skb);
- if (!siocb->scm) {
- siocb->scm = &tmp_scm;
- memset(&tmp_scm, 0, sizeof(tmp_scm));
- }
- siocb->scm->creds = UNIXCB(skb).creds;
- unix_set_secdata(siocb->scm, skb);
+ scm.creds = UNIXCB(skb).creds;
+ unix_set_secdata(&scm, skb);
if (!(flags & MSG_PEEK)) {
if (UNIXCB(skb).fp)
- unix_detach_fds(siocb->scm, skb);
+ unix_detach_fds(&scm, skb);
sk_peek_offset_bwd(sk, skb->len);
} else {
@@ -1840,11 +1828,11 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
sk_peek_offset_fwd(sk, size);
if (UNIXCB(skb).fp)
- siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
+ scm.fp = scm_fp_dup(UNIXCB(skb).fp);
}
err = (flags & MSG_TRUNC) ? skb->len - skip : size;
- scm_recv(sock, msg, siocb->scm, flags);
+ scm_recv(sock, msg, &scm, flags);
out_free:
skb_free_datagram(sk, skb);
@@ -1892,8 +1880,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size,
int flags)
{
- struct sock_iocb *siocb = kiocb_to_siocb(iocb);
- struct scm_cookie tmp_scm = SCM_COOKIE_INIT;
+ struct scm_cookie scm = SCM_COOKIE_INIT;
struct sock *sk = sock->sk;
struct unix_sock *u = unix_sk(sk);
struct sockaddr_un *sunaddr = msg->msg_name;
@@ -1921,11 +1908,6 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
* while sleeps in memcpy_tomsg
*/
- if (!siocb->scm) {
- siocb->scm = &tmp_scm;
- memset(&tmp_scm, 0, sizeof(tmp_scm));
- }
-
err = mutex_lock_interruptible(&u->readlock);
if (err) {
err = sock_intr_errno(timeo);
@@ -1987,11 +1969,11 @@ again:
if (check_creds) {
/* Never glue messages from different writers */
if (!scm_creds_equal(&UNIXCB(skb).creds,
- &siocb->scm->creds));
+ &scm.creds));
break;
} else {
/* Copy credentials */
- siocb->scm->creds = UNIXCB(skb).creds;
+ scm.creds = UNIXCB(skb).creds;
check_creds = 1;
}
@@ -2017,7 +1999,7 @@ again:
sk_peek_offset_bwd(sk, chunk);
if (UNIXCB(skb).fp)
- unix_detach_fds(siocb->scm, skb);
+ unix_detach_fds(&scm, skb);
if (skb->len)
break;
@@ -2025,13 +2007,13 @@ again:
skb_unlink(skb, &sk->sk_receive_queue);
consume_skb(skb);
- if (siocb->scm->fp)
+ if (scm.fp)
break;
} else {
/* It is questionable, see note in unix_dgram_recvmsg.
*/
if (UNIXCB(skb).fp)
- siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
+ scm.fp = scm_fp_dup(UNIXCB(skb).fp);
sk_peek_offset_fwd(sk, chunk);
@@ -2040,7 +2022,7 @@ again:
} while (size);
mutex_unlock(&u->readlock);
- scm_recv(sock, msg, siocb->scm, flags);
+ scm_recv(sock, msg, &scm, flags);
out:
return copied ? : err;
}
--
1.8.1.4
--
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