Commit 3a0ed3e9 authored by Deepa Dinamani's avatar Deepa Dinamani Committed by David S. Miller
Browse files

sock: Make sock->sk_stamp thread-safe 



Al Viro mentioned (Message-ID
<20170626041334.GZ10672@ZenIV.linux.org.uk>)
that there is probably a race condition
lurking in accesses of sk_stamp on 32-bit machines.

sock->sk_stamp is of type ktime_t which is always an s64.
On a 32 bit architecture, we might run into situations of
unsafe access as the access to the field becomes non atomic.

Use seqlocks for synchronization.
This allows us to avoid using spinlocks for readers as
readers do not need mutual exclusion.

Another approach to solve this is to require sk_lock for all
modifications of the timestamps. The current approach allows
for timestamps to have their own lock: sk_stamp_lock.
This allows for the patch to not compete with already
existing critical sections, and side effects are limited
to the paths in the patch.

The addition of the new field maintains the data locality
optimizations from
commit 9115e8cd ("net: reorganize struct sock for better data
locality")

Note that all the instances of the sk_stamp accesses
are either through the ioctl or the syscall recvmsg.

Signed-off-by: default avatarDeepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 756af9c6

include/net/sock.h

+35 −3
Original line number Diff line number Diff line
@@ -298,6 +298,7 @@ struct sock_common { 
  *	@sk_filter: socket filtering instructions

  *	@sk_timer: sock cleanup timer

  *	@sk_stamp: time stamp of last packet received

  *	@sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only

  *	@sk_tsflags: SO_TIMESTAMPING socket options

  *	@sk_tskey: counter to disambiguate concurrent tstamp requests

  *	@sk_zckey: counter to order MSG_ZEROCOPY notifications
@@ -474,6 +475,9 @@ struct sock { 
	const struct cred	*sk_peer_cred;

	long			sk_rcvtimeo;

	ktime_t			sk_stamp;

#if BITS_PER_LONG==32

	seqlock_t		sk_stamp_seq;

#endif

	u16			sk_tsflags;

	u8			sk_shutdown;

	u32			sk_tskey;
@@ -2297,6 +2301,34 @@ static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) 
	atomic_add(segs, &sk->sk_drops);

}



static inline ktime_t sock_read_timestamp(struct sock *sk)

{

#if BITS_PER_LONG==32

	unsigned int seq;

	ktime_t kt;



	do {

		seq = read_seqbegin(&sk->sk_stamp_seq);

		kt = sk->sk_stamp;

	} while (read_seqretry(&sk->sk_stamp_seq, seq));



	return kt;

#else

	return sk->sk_stamp;

#endif

}



static inline void sock_write_timestamp(struct sock *sk, ktime_t kt)

{

#if BITS_PER_LONG==32

	write_seqlock(&sk->sk_stamp_seq);

	sk->sk_stamp = kt;

	write_sequnlock(&sk->sk_stamp_seq);

#else

	sk->sk_stamp = kt;

#endif

}



void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,

			   struct sk_buff *skb);

void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
@@ -2321,7 +2353,7 @@ sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) 
	     (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE)))

		__sock_recv_timestamp(msg, sk, skb);

	else

		sk->sk_stamp = kt;

		sock_write_timestamp(sk, kt);



	if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid)

		__sock_recv_wifi_status(msg, sk, skb);
@@ -2342,9 +2374,9 @@ static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 
	if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY)

		__sock_recv_ts_and_drops(msg, sk, skb);

	else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP)))

		sk->sk_stamp = skb->tstamp;

		sock_write_timestamp(sk, skb->tstamp);

	else if (unlikely(sk->sk_stamp == SK_DEFAULT_STAMP))

		sk->sk_stamp = 0;

		sock_write_timestamp(sk, 0);

}



void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags);

net/compat.c

+9 −6
Original line number Diff line number Diff line
@@ -467,12 +467,14 @@ int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 
	ctv = (struct compat_timeval __user *) userstamp;

	err = -ENOENT;

	sock_enable_timestamp(sk, SOCK_TIMESTAMP);

	tv = ktime_to_timeval(sk->sk_stamp);

	tv = ktime_to_timeval(sock_read_timestamp(sk));



	if (tv.tv_sec == -1)

		return err;

	if (tv.tv_sec == 0) {

		sk->sk_stamp = ktime_get_real();

		tv = ktime_to_timeval(sk->sk_stamp);

		ktime_t kt = ktime_get_real();

		sock_write_timestamp(sk, kt);

		tv = ktime_to_timeval(kt);

	}

	err = 0;

	if (put_user(tv.tv_sec, &ctv->tv_sec) ||
@@ -494,12 +496,13 @@ int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *usersta 
	ctv = (struct compat_timespec __user *) userstamp;

	err = -ENOENT;

	sock_enable_timestamp(sk, SOCK_TIMESTAMP);

	ts = ktime_to_timespec(sk->sk_stamp);

	ts = ktime_to_timespec(sock_read_timestamp(sk));

	if (ts.tv_sec == -1)

		return err;

	if (ts.tv_sec == 0) {

		sk->sk_stamp = ktime_get_real();

		ts = ktime_to_timespec(sk->sk_stamp);

		ktime_t kt = ktime_get_real();

		sock_write_timestamp(sk, kt);

		ts = ktime_to_timespec(kt);

	}

	err = 0;

	if (put_user(ts.tv_sec, &ctv->tv_sec) ||

net/core/sock.c

+10 −5
Original line number Diff line number Diff line
@@ -2751,6 +2751,9 @@ void sock_init_data(struct socket *sock, struct sock *sk) 
	sk->sk_sndtimeo		=	MAX_SCHEDULE_TIMEOUT;



	sk->sk_stamp = SK_DEFAULT_STAMP;

#if BITS_PER_LONG==32

	seqlock_init(&sk->sk_stamp_seq);

#endif

	atomic_set(&sk->sk_zckey, 0);



#ifdef CONFIG_NET_RX_BUSY_POLL
@@ -2850,12 +2853,13 @@ int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 
	struct timeval tv;



	sock_enable_timestamp(sk, SOCK_TIMESTAMP);

	tv = ktime_to_timeval(sk->sk_stamp);

	tv = ktime_to_timeval(sock_read_timestamp(sk));

	if (tv.tv_sec == -1)

		return -ENOENT;

	if (tv.tv_sec == 0) {

		sk->sk_stamp = ktime_get_real();

		tv = ktime_to_timeval(sk->sk_stamp);

		ktime_t kt = ktime_get_real();

		sock_write_timestamp(sk, kt);

		tv = ktime_to_timeval(kt);

	}

	return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;

}
@@ -2866,11 +2870,12 @@ int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 
	struct timespec ts;



	sock_enable_timestamp(sk, SOCK_TIMESTAMP);

	ts = ktime_to_timespec(sk->sk_stamp);

	ts = ktime_to_timespec(sock_read_timestamp(sk));

	if (ts.tv_sec == -1)

		return -ENOENT;

	if (ts.tv_sec == 0) {

		sk->sk_stamp = ktime_get_real();

		ktime_t kt = ktime_get_real();

		sock_write_timestamp(sk, kt);

		ts = ktime_to_timespec(sk->sk_stamp);

	}

	return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;

net/sunrpc/svcsock.c

+1 −1
Original line number Diff line number Diff line
@@ -549,7 +549,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp) 
		/* Don't enable netstamp, sunrpc doesn't

		   need that much accuracy */

	}

	svsk->sk_sk->sk_stamp = skb->tstamp;

	sock_write_timestamp(svsk->sk_sk, skb->tstamp);

	set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */



	len  = skb->len;

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