Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 943 insertions, 0 deletions

diff --git a/net/compat.c b/net/compat.c
new file mode 100644
index 000000000..2778a236e
--- /dev/null
+++ b/net/compat.c
@@ -0,0 +1,943 @@
+/*
+ * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
+ *
+ * Copyright (C) 2000		VA Linux Co
+ * Copyright (C) 2000		Don Dugger <n0ano@valinux.com>
+ * Copyright (C) 1999 		Arun Sharma <arun.sharma@intel.com>
+ * Copyright (C) 1997,1998 	Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 1997 		David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 2000		Hewlett-Packard Co.
+ * Copyright (C) 2000		David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2000,2001	Andi Kleen, SuSE Labs
+ */
+
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/file.h>
+#include <linux/icmpv6.h>
+#include <linux/socket.h>
+#include <linux/syscalls.h>
+#include <linux/filter.h>
+#include <linux/compat.h>
+#include <linux/security.h>
+#include <linux/audit.h>
+#include <linux/export.h>
+
+#include <net/scm.h>
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <linux/uaccess.h>
+#include <net/compat.h>
+
+int get_compat_msghdr(struct msghdr *kmsg,
+		      struct compat_msghdr __user *umsg,
+		      struct sockaddr __user **save_addr,
+		      struct iovec **iov)
+{
+	struct compat_msghdr msg;
+	ssize_t err;
+
+	if (copy_from_user(&msg, umsg, sizeof(*umsg)))
+		return -EFAULT;
+
+	kmsg->msg_flags = msg.msg_flags;
+	kmsg->msg_namelen = msg.msg_namelen;
+
+	if (!msg.msg_name)
+		kmsg->msg_namelen = 0;
+
+	if (kmsg->msg_namelen < 0)
+		return -EINVAL;
+
+	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
+		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
+
+	kmsg->msg_control = compat_ptr(msg.msg_control);
+	kmsg->msg_controllen = msg.msg_controllen;
+
+	if (save_addr)
+		*save_addr = compat_ptr(msg.msg_name);
+
+	if (msg.msg_name && kmsg->msg_namelen) {
+		if (!save_addr) {
+			err = move_addr_to_kernel(compat_ptr(msg.msg_name),
+						  kmsg->msg_namelen,
+						  kmsg->msg_name);
+			if (err < 0)
+				return err;
+		}
+	} else {
+		kmsg->msg_name = NULL;
+		kmsg->msg_namelen = 0;
+	}
+
+	if (msg.msg_iovlen > UIO_MAXIOV)
+		return -EMSGSIZE;
+
+	kmsg->msg_iocb = NULL;
+
+	return compat_import_iovec(save_addr ? READ : WRITE,
+				   compat_ptr(msg.msg_iov), msg.msg_iovlen,
+				   UIO_FASTIOV, iov, &kmsg->msg_iter);
+}
+
+/* Bleech... */
+#define CMSG_COMPAT_ALIGN(len)	ALIGN((len), sizeof(s32))
+
+#define CMSG_COMPAT_DATA(cmsg)				\
+	((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
+#define CMSG_COMPAT_SPACE(len)				\
+	(sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
+#define CMSG_COMPAT_LEN(len)				\
+	(sizeof(struct compat_cmsghdr) + (len))
+
+#define CMSG_COMPAT_FIRSTHDR(msg)			\
+	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?	\
+	 (struct compat_cmsghdr __user *)((msg)->msg_control) :		\
+	 (struct compat_cmsghdr __user *)NULL)
+
+#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
+	((ucmlen) >= sizeof(struct compat_cmsghdr) && \
+	 (ucmlen) <= (unsigned long) \
+	 ((mhdr)->msg_controllen - \
+	  ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
+
+static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
+		struct compat_cmsghdr __user *cmsg, int cmsg_len)
+{
+	char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
+	if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
+			msg->msg_controllen)
+		return NULL;
+	return (struct compat_cmsghdr __user *)ptr;
+}
+
+/* There is a lot of hair here because the alignment rules (and
+ * thus placement) of cmsg headers and length are different for
+ * 32-bit apps.  -DaveM
+ */
+int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
+			       unsigned char *stackbuf, int stackbuf_size)
+{
+	struct compat_cmsghdr __user *ucmsg;
+	struct cmsghdr *kcmsg, *kcmsg_base;
+	compat_size_t ucmlen;
+	__kernel_size_t kcmlen, tmp;
+	int err = -EFAULT;
+
+	BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
+		     CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
+
+	kcmlen = 0;
+	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
+	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
+	while (ucmsg != NULL) {
+		if (get_user(ucmlen, &ucmsg->cmsg_len))
+			return -EFAULT;
+
+		/* Catch bogons. */
+		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
+			return -EINVAL;
+
+		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
+		tmp = CMSG_ALIGN(tmp);
+		kcmlen += tmp;
+		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
+	}
+	if (kcmlen == 0)
+		return -EINVAL;
+
+	/* The kcmlen holds the 64-bit version of the control length.
+	 * It may not be modified as we do not stick it into the kmsg
+	 * until we have successfully copied over all of the data
+	 * from the user.
+	 */
+	if (kcmlen > stackbuf_size)
+		kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
+	if (kcmsg == NULL)
+		return -ENOMEM;
+
+	/* Now copy them over neatly. */
+	memset(kcmsg, 0, kcmlen);
+	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
+	while (ucmsg != NULL) {
+		if (__get_user(ucmlen, &ucmsg->cmsg_len))
+			goto Efault;
+		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
+			goto Einval;
+		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
+		if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
+			goto Einval;
+		kcmsg->cmsg_len = tmp;
+		tmp = CMSG_ALIGN(tmp);
+		if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
+		    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
+		    copy_from_user(CMSG_DATA(kcmsg),
+				   CMSG_COMPAT_DATA(ucmsg),
+				   (ucmlen - sizeof(*ucmsg))))
+			goto Efault;
+
+		/* Advance. */
+		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
+		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
+	}
+
+	/*
+	 * check the length of messages copied in is the same as the
+	 * what we get from the first loop
+	 */
+	if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
+		goto Einval;
+
+	/* Ok, looks like we made it.  Hook it up and return success. */
+	kmsg->msg_control = kcmsg_base;
+	kmsg->msg_controllen = kcmlen;
+	return 0;
+
+Einval:
+	err = -EINVAL;
+Efault:
+	if (kcmsg_base != (struct cmsghdr *)stackbuf)
+		sock_kfree_s(sk, kcmsg_base, kcmlen);
+	return err;
+}
+
+int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
+{
+	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
+	struct compat_cmsghdr cmhdr;
+	struct compat_timeval ctv;
+	struct compat_timespec cts[3];
+	int cmlen;
+
+	if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
+		kmsg->msg_flags |= MSG_CTRUNC;
+		return 0; /* XXX: return error? check spec. */
+	}
+
+	if (!COMPAT_USE_64BIT_TIME) {
+		if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
+			struct timeval *tv = (struct timeval *)data;
+			ctv.tv_sec = tv->tv_sec;
+			ctv.tv_usec = tv->tv_usec;
+			data = &ctv;
+			len = sizeof(ctv);
+		}
+		if (level == SOL_SOCKET &&
+		    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
+			int count = type == SCM_TIMESTAMPNS ? 1 : 3;
+			int i;
+			struct timespec *ts = (struct timespec *)data;
+			for (i = 0; i < count; i++) {
+				cts[i].tv_sec = ts[i].tv_sec;
+				cts[i].tv_nsec = ts[i].tv_nsec;
+			}
+			data = &cts;
+			len = sizeof(cts[0]) * count;
+		}
+	}
+
+	cmlen = CMSG_COMPAT_LEN(len);
+	if (kmsg->msg_controllen < cmlen) {
+		kmsg->msg_flags |= MSG_CTRUNC;
+		cmlen = kmsg->msg_controllen;
+	}
+	cmhdr.cmsg_level = level;
+	cmhdr.cmsg_type = type;
+	cmhdr.cmsg_len = cmlen;
+
+	if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
+		return -EFAULT;
+	if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
+		return -EFAULT;
+	cmlen = CMSG_COMPAT_SPACE(len);
+	if (kmsg->msg_controllen < cmlen)
+		cmlen = kmsg->msg_controllen;
+	kmsg->msg_control += cmlen;
+	kmsg->msg_controllen -= cmlen;
+	return 0;
+}
+
+void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
+{
+	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
+	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
+	int fdnum = scm->fp->count;
+	struct file **fp = scm->fp->fp;
+	int __user *cmfptr;
+	int err = 0, i;
+
+	if (fdnum < fdmax)
+		fdmax = fdnum;
+
+	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
+		int new_fd;
+		err = security_file_receive(fp[i]);
+		if (err)
+			break;
+		err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
+					  ? O_CLOEXEC : 0);
+		if (err < 0)
+			break;
+		new_fd = err;
+		err = put_user(new_fd, cmfptr);
+		if (err) {
+			put_unused_fd(new_fd);
+			break;
+		}
+		/* Bump the usage count and install the file. */
+		__receive_sock(fp[i]);
+		fd_install(new_fd, get_file(fp[i]));
+	}
+
+	if (i > 0) {
+		int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
+		err = put_user(SOL_SOCKET, &cm->cmsg_level);
+		if (!err)
+			err = put_user(SCM_RIGHTS, &cm->cmsg_type);
+		if (!err)
+			err = put_user(cmlen, &cm->cmsg_len);
+		if (!err) {
+			cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
+			kmsg->msg_control += cmlen;
+			kmsg->msg_controllen -= cmlen;
+		}
+	}
+	if (i < fdnum)
+		kmsg->msg_flags |= MSG_CTRUNC;
+
+	/*
+	 * All of the files that fit in the message have had their
+	 * usage counts incremented, so we just free the list.
+	 */
+	__scm_destroy(scm);
+}
+
+/* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
+struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
+{
+	struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
+	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
+	struct compat_sock_fprog f32;
+	struct sock_fprog f;
+
+	if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
+		return NULL;
+	memset(&f, 0, sizeof(f));
+	f.len = f32.len;
+	f.filter = compat_ptr(f32.filter);
+	if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
+		return NULL;
+
+	return kfprog;
+}
+EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
+
+static int do_set_attach_filter(struct socket *sock, int level, int optname,
+				char __user *optval, unsigned int optlen)
+{
+	struct sock_fprog __user *kfprog;
+
+	kfprog = get_compat_bpf_fprog(optval);
+	if (!kfprog)
+		return -EFAULT;
+
+	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
+			      sizeof(struct sock_fprog));
+}
+
+static int do_set_sock_timeout(struct socket *sock, int level,
+		int optname, char __user *optval, unsigned int optlen)
+{
+	struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
+	struct timeval ktime;
+	mm_segment_t old_fs;
+	int err;
+
+	if (optlen < sizeof(*up))
+		return -EINVAL;
+	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
+	    __get_user(ktime.tv_sec, &up->tv_sec) ||
+	    __get_user(ktime.tv_usec, &up->tv_usec))
+		return -EFAULT;
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
+	set_fs(old_fs);
+
+	return err;
+}
+
+static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
+				char __user *optval, unsigned int optlen)
+{
+	if (optname == SO_ATTACH_FILTER ||
+	    optname == SO_ATTACH_REUSEPORT_CBPF)
+		return do_set_attach_filter(sock, level, optname,
+					    optval, optlen);
+	if (!COMPAT_USE_64BIT_TIME &&
+	    (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
+		return do_set_sock_timeout(sock, level, optname, optval, optlen);
+
+	return sock_setsockopt(sock, level, optname, optval, optlen);
+}
+
+static int __compat_sys_setsockopt(int fd, int level, int optname,
+				   char __user *optval, unsigned int optlen)
+{
+	int err;
+	struct socket *sock = sockfd_lookup(fd, &err);
+
+	if (sock) {
+		err = security_socket_setsockopt(sock, level, optname);
+		if (err) {
+			sockfd_put(sock);
+			return err;
+		}
+
+		if (level == SOL_SOCKET)
+			err = compat_sock_setsockopt(sock, level,
+					optname, optval, optlen);
+		else if (sock->ops->compat_setsockopt)
+			err = sock->ops->compat_setsockopt(sock, level,
+					optname, optval, optlen);
+		else
+			err = sock->ops->setsockopt(sock, level,
+					optname, optval, optlen);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
+		       char __user *, optval, unsigned int, optlen)
+{
+	return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
+}
+
+static int do_get_sock_timeout(struct socket *sock, int level, int optname,
+		char __user *optval, int __user *optlen)
+{
+	struct compat_timeval __user *up;
+	struct timeval ktime;
+	mm_segment_t old_fs;
+	int len, err;
+
+	up = (struct compat_timeval __user *) optval;
+	if (get_user(len, optlen))
+		return -EFAULT;
+	if (len < sizeof(*up))
+		return -EINVAL;
+	len = sizeof(ktime);
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
+	set_fs(old_fs);
+
+	if (!err) {
+		if (put_user(sizeof(*up), optlen) ||
+		    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
+		    __put_user(ktime.tv_sec, &up->tv_sec) ||
+		    __put_user(ktime.tv_usec, &up->tv_usec))
+			err = -EFAULT;
+	}
+	return err;
+}
+
+static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
+				char __user *optval, int __user *optlen)
+{
+	if (!COMPAT_USE_64BIT_TIME &&
+	    (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
+		return do_get_sock_timeout(sock, level, optname, optval, optlen);
+	return sock_getsockopt(sock, level, optname, optval, optlen);
+}
+
+int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
+{
+	struct compat_timeval __user *ctv;
+	int err;
+	struct timeval tv;
+
+	if (COMPAT_USE_64BIT_TIME)
+		return sock_get_timestamp(sk, userstamp);
+
+	ctv = (struct compat_timeval __user *) userstamp;
+	err = -ENOENT;
+	sock_enable_timestamp(sk, SOCK_TIMESTAMP);
+	tv = ktime_to_timeval(sock_read_timestamp(sk));
+
+	if (tv.tv_sec == -1)
+		return err;
+	if (tv.tv_sec == 0) {
+		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) ||
+			put_user(tv.tv_usec, &ctv->tv_usec))
+		err = -EFAULT;
+	return err;
+}
+EXPORT_SYMBOL(compat_sock_get_timestamp);
+
+int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
+{
+	struct compat_timespec __user *ctv;
+	int err;
+	struct timespec ts;
+
+	if (COMPAT_USE_64BIT_TIME)
+		return sock_get_timestampns (sk, userstamp);
+
+	ctv = (struct compat_timespec __user *) userstamp;
+	err = -ENOENT;
+	sock_enable_timestamp(sk, SOCK_TIMESTAMP);
+	ts = ktime_to_timespec(sock_read_timestamp(sk));
+	if (ts.tv_sec == -1)
+		return err;
+	if (ts.tv_sec == 0) {
+		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) ||
+			put_user(ts.tv_nsec, &ctv->tv_nsec))
+		err = -EFAULT;
+	return err;
+}
+EXPORT_SYMBOL(compat_sock_get_timestampns);
+
+static int __compat_sys_getsockopt(int fd, int level, int optname,
+				   char __user *optval,
+				   int __user *optlen)
+{
+	int err;
+	struct socket *sock = sockfd_lookup(fd, &err);
+
+	if (sock) {
+		err = security_socket_getsockopt(sock, level, optname);
+		if (err) {
+			sockfd_put(sock);
+			return err;
+		}
+
+		if (level == SOL_SOCKET)
+			err = compat_sock_getsockopt(sock, level,
+					optname, optval, optlen);
+		else if (sock->ops->compat_getsockopt)
+			err = sock->ops->compat_getsockopt(sock, level,
+					optname, optval, optlen);
+		else
+			err = sock->ops->getsockopt(sock, level,
+					optname, optval, optlen);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
+		       char __user *, optval, int __user *, optlen)
+{
+	return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
+}
+
+struct compat_group_req {
+	__u32				 gr_interface;
+	struct __kernel_sockaddr_storage gr_group
+		__aligned(4);
+} __packed;
+
+struct compat_group_source_req {
+	__u32				 gsr_interface;
+	struct __kernel_sockaddr_storage gsr_group
+		__aligned(4);
+	struct __kernel_sockaddr_storage gsr_source
+		__aligned(4);
+} __packed;
+
+struct compat_group_filter {
+	__u32				 gf_interface;
+	struct __kernel_sockaddr_storage gf_group
+		__aligned(4);
+	__u32				 gf_fmode;
+	__u32				 gf_numsrc;
+	struct __kernel_sockaddr_storage gf_slist[1]
+		__aligned(4);
+} __packed;
+
+#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
+			sizeof(struct __kernel_sockaddr_storage))
+
+
+int compat_mc_setsockopt(struct sock *sock, int level, int optname,
+	char __user *optval, unsigned int optlen,
+	int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
+{
+	char __user	*koptval = optval;
+	int		koptlen = optlen;
+
+	switch (optname) {
+	case MCAST_JOIN_GROUP:
+	case MCAST_LEAVE_GROUP:
+	{
+		struct compat_group_req __user *gr32 = (void *)optval;
+		struct group_req __user *kgr =
+			compat_alloc_user_space(sizeof(struct group_req));
+		u32 interface;
+
+		if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
+		    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
+		    __get_user(interface, &gr32->gr_interface) ||
+		    __put_user(interface, &kgr->gr_interface) ||
+		    copy_in_user(&kgr->gr_group, &gr32->gr_group,
+				sizeof(kgr->gr_group)))
+			return -EFAULT;
+		koptval = (char __user *)kgr;
+		koptlen = sizeof(struct group_req);
+		break;
+	}
+	case MCAST_JOIN_SOURCE_GROUP:
+	case MCAST_LEAVE_SOURCE_GROUP:
+	case MCAST_BLOCK_SOURCE:
+	case MCAST_UNBLOCK_SOURCE:
+	{
+		struct compat_group_source_req __user *gsr32 = (void *)optval;
+		struct group_source_req __user *kgsr = compat_alloc_user_space(
+			sizeof(struct group_source_req));
+		u32 interface;
+
+		if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
+		    !access_ok(VERIFY_WRITE, kgsr,
+			sizeof(struct group_source_req)) ||
+		    __get_user(interface, &gsr32->gsr_interface) ||
+		    __put_user(interface, &kgsr->gsr_interface) ||
+		    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
+				sizeof(kgsr->gsr_group)) ||
+		    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
+				sizeof(kgsr->gsr_source)))
+			return -EFAULT;
+		koptval = (char __user *)kgsr;
+		koptlen = sizeof(struct group_source_req);
+		break;
+	}
+	case MCAST_MSFILTER:
+	{
+		struct compat_group_filter __user *gf32 = (void *)optval;
+		struct group_filter __user *kgf;
+		u32 interface, fmode, numsrc;
+
+		if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
+		    __get_user(interface, &gf32->gf_interface) ||
+		    __get_user(fmode, &gf32->gf_fmode) ||
+		    __get_user(numsrc, &gf32->gf_numsrc))
+			return -EFAULT;
+		koptlen = optlen + sizeof(struct group_filter) -
+				sizeof(struct compat_group_filter);
+		if (koptlen < GROUP_FILTER_SIZE(numsrc))
+			return -EINVAL;
+		kgf = compat_alloc_user_space(koptlen);
+		if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
+		    __put_user(interface, &kgf->gf_interface) ||
+		    __put_user(fmode, &kgf->gf_fmode) ||
+		    __put_user(numsrc, &kgf->gf_numsrc) ||
+		    copy_in_user(&kgf->gf_group, &gf32->gf_group,
+				sizeof(kgf->gf_group)) ||
+		    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
+				numsrc * sizeof(kgf->gf_slist[0]))))
+			return -EFAULT;
+		koptval = (char __user *)kgf;
+		break;
+	}
+
+	default:
+		break;
+	}
+	return setsockopt(sock, level, optname, koptval, koptlen);
+}
+EXPORT_SYMBOL(compat_mc_setsockopt);
+
+int compat_mc_getsockopt(struct sock *sock, int level, int optname,
+	char __user *optval, int __user *optlen,
+	int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
+{
+	struct compat_group_filter __user *gf32 = (void *)optval;
+	struct group_filter __user *kgf;
+	int __user	*koptlen;
+	u32 interface, fmode, numsrc;
+	int klen, ulen, err;
+
+	if (optname != MCAST_MSFILTER)
+		return getsockopt(sock, level, optname, optval, optlen);
+
+	koptlen = compat_alloc_user_space(sizeof(*koptlen));
+	if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
+	    __get_user(ulen, optlen))
+		return -EFAULT;
+
+	/* adjust len for pad */
+	klen = ulen + sizeof(*kgf) - sizeof(*gf32);
+
+	if (klen < GROUP_FILTER_SIZE(0))
+		return -EINVAL;
+
+	if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
+	    __put_user(klen, koptlen))
+		return -EFAULT;
+
+	/* have to allow space for previous compat_alloc_user_space, too */
+	kgf = compat_alloc_user_space(klen+sizeof(*optlen));
+
+	if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
+	    __get_user(interface, &gf32->gf_interface) ||
+	    __get_user(fmode, &gf32->gf_fmode) ||
+	    __get_user(numsrc, &gf32->gf_numsrc) ||
+	    __put_user(interface, &kgf->gf_interface) ||
+	    __put_user(fmode, &kgf->gf_fmode) ||
+	    __put_user(numsrc, &kgf->gf_numsrc) ||
+	    copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
+		return -EFAULT;
+
+	err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
+	if (err)
+		return err;
+
+	if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
+	    __get_user(klen, koptlen))
+		return -EFAULT;
+
+	ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
+
+	if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
+	    __put_user(ulen, optlen))
+		return -EFAULT;
+
+	if (!access_ok(VERIFY_READ, kgf, klen) ||
+	    !access_ok(VERIFY_WRITE, gf32, ulen) ||
+	    __get_user(interface, &kgf->gf_interface) ||
+	    __get_user(fmode, &kgf->gf_fmode) ||
+	    __get_user(numsrc, &kgf->gf_numsrc) ||
+	    __put_user(interface, &gf32->gf_interface) ||
+	    __put_user(fmode, &gf32->gf_fmode) ||
+	    __put_user(numsrc, &gf32->gf_numsrc))
+		return -EFAULT;
+	if (numsrc) {
+		int copylen;
+
+		klen -= GROUP_FILTER_SIZE(0);
+		copylen = numsrc * sizeof(gf32->gf_slist[0]);
+		if (copylen > klen)
+			copylen = klen;
+		if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
+			return -EFAULT;
+	}
+	return err;
+}
+EXPORT_SYMBOL(compat_mc_getsockopt);
+
+
+/* Argument list sizes for compat_sys_socketcall */
+#define AL(x) ((x) * sizeof(u32))
+static unsigned char nas[21] = {
+	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
+	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
+	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
+	AL(4), AL(5), AL(4)
+};
+#undef AL
+
+static inline long __compat_sys_sendmsg(int fd,
+					struct compat_msghdr __user *msg,
+					unsigned int flags)
+{
+	return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
+			     flags | MSG_CMSG_COMPAT, false);
+}
+
+COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
+		       unsigned int, flags)
+{
+	return __compat_sys_sendmsg(fd, msg, flags);
+}
+
+static inline long __compat_sys_sendmmsg(int fd,
+					 struct compat_mmsghdr __user *mmsg,
+					 unsigned int vlen, unsigned int flags)
+{
+	return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
+			      flags | MSG_CMSG_COMPAT, false);
+}
+
+COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
+		       unsigned int, vlen, unsigned int, flags)
+{
+	return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
+}
+
+static inline long __compat_sys_recvmsg(int fd,
+					struct compat_msghdr __user *msg,
+					unsigned int flags)
+{
+	return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
+			     flags | MSG_CMSG_COMPAT, false);
+}
+
+COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
+		       unsigned int, flags)
+{
+	return __compat_sys_recvmsg(fd, msg, flags);
+}
+
+static inline long __compat_sys_recvfrom(int fd, void __user *buf,
+					 compat_size_t len, unsigned int flags,
+					 struct sockaddr __user *addr,
+					 int __user *addrlen)
+{
+	return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
+			      addrlen);
+}
+
+COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
+{
+	return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
+}
+
+COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
+		       unsigned int, flags, struct sockaddr __user *, addr,
+		       int __user *, addrlen)
+{
+	return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
+}
+
+static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
+				 unsigned int vlen, unsigned int flags,
+				 struct compat_timespec __user *timeout)
+{
+	int datagrams;
+	struct timespec ktspec;
+
+	if (timeout == NULL)
+		return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
+				      flags | MSG_CMSG_COMPAT, NULL);
+
+	if (compat_get_timespec(&ktspec, timeout))
+		return -EFAULT;
+
+	datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
+				   flags | MSG_CMSG_COMPAT, &ktspec);
+	if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
+		datagrams = -EFAULT;
+
+	return datagrams;
+}
+
+COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
+		       unsigned int, vlen, unsigned int, flags,
+		       struct compat_timespec __user *, timeout)
+{
+	return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
+}
+
+COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
+{
+	u32 a[AUDITSC_ARGS];
+	unsigned int len;
+	u32 a0, a1;
+	int ret;
+
+	if (call < SYS_SOCKET || call > SYS_SENDMMSG)
+		return -EINVAL;
+	len = nas[call];
+	if (len > sizeof(a))
+		return -EINVAL;
+
+	if (copy_from_user(a, args, len))
+		return -EFAULT;
+
+	ret = audit_socketcall_compat(len / sizeof(a[0]), a);
+	if (ret)
+		return ret;
+
+	a0 = a[0];
+	a1 = a[1];
+
+	switch (call) {
+	case SYS_SOCKET:
+		ret = __sys_socket(a0, a1, a[2]);
+		break;
+	case SYS_BIND:
+		ret = __sys_bind(a0, compat_ptr(a1), a[2]);
+		break;
+	case SYS_CONNECT:
+		ret = __sys_connect(a0, compat_ptr(a1), a[2]);
+		break;
+	case SYS_LISTEN:
+		ret = __sys_listen(a0, a1);
+		break;
+	case SYS_ACCEPT:
+		ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
+		break;
+	case SYS_GETSOCKNAME:
+		ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
+		break;
+	case SYS_GETPEERNAME:
+		ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
+		break;
+	case SYS_SOCKETPAIR:
+		ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
+		break;
+	case SYS_SEND:
+		ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
+		break;
+	case SYS_SENDTO:
+		ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
+				   compat_ptr(a[4]), a[5]);
+		break;
+	case SYS_RECV:
+		ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
+					    NULL, NULL);
+		break;
+	case SYS_RECVFROM:
+		ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
+					    compat_ptr(a[4]),
+					    compat_ptr(a[5]));
+		break;
+	case SYS_SHUTDOWN:
+		ret = __sys_shutdown(a0, a1);
+		break;
+	case SYS_SETSOCKOPT:
+		ret = __compat_sys_setsockopt(a0, a1, a[2],
+					      compat_ptr(a[3]), a[4]);
+		break;
+	case SYS_GETSOCKOPT:
+		ret = __compat_sys_getsockopt(a0, a1, a[2],
+					      compat_ptr(a[3]),
+					      compat_ptr(a[4]));
+		break;
+	case SYS_SENDMSG:
+		ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
+		break;
+	case SYS_SENDMMSG:
+		ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
+		break;
+	case SYS_RECVMSG:
+		ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
+		break;
+	case SYS_RECVMMSG:
+		ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
+					    compat_ptr(a[4]));
+		break;
+	case SYS_ACCEPT4:
+		ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}