compat.c 23.9 KB
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/*
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 * 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>
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 * Copyright (C) 2000,2001	Andi Kleen, SuSE Labs
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 */

#include <linux/kernel.h>
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#include <linux/gfp.h>
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#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>
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#include <linux/export.h>
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#include <net/scm.h>
#include <net/sock.h>
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#include <net/ip.h>
#include <net/ipv6.h>
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#include <asm/uaccess.h>
#include <net/compat.h>

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int get_compat_msghdr(struct msghdr *kmsg,
		      struct compat_msghdr __user *umsg,
		      struct sockaddr __user **save_addr,
		      struct iovec **iov)
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{
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	compat_uptr_t uaddr, uiov, tmp3;
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	compat_size_t nr_segs;
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	ssize_t err;
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	if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
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	    __get_user(uaddr, &umsg->msg_name) ||
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	    __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
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	    __get_user(uiov, &umsg->msg_iov) ||
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	    __get_user(nr_segs, &umsg->msg_iovlen) ||
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	    __get_user(tmp3, &umsg->msg_control) ||
	    __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
	    __get_user(kmsg->msg_flags, &umsg->msg_flags))
		return -EFAULT;
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	if (!uaddr)
		kmsg->msg_namelen = 0;

	if (kmsg->msg_namelen < 0)
		return -EINVAL;

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	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
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		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
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	kmsg->msg_control = compat_ptr(tmp3);

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	if (save_addr)
		*save_addr = compat_ptr(uaddr);
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	if (uaddr && kmsg->msg_namelen) {
		if (!save_addr) {
			err = move_addr_to_kernel(compat_ptr(uaddr),
						  kmsg->msg_namelen,
						  kmsg->msg_name);
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			if (err < 0)
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				return err;
		}
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	} else {
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		kmsg->msg_name = NULL;
		kmsg->msg_namelen = 0;
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	}
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	if (nr_segs > UIO_MAXIOV)
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		return -EMSGSIZE;

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	kmsg->msg_iocb = NULL;

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	return compat_import_iovec(save_addr ? READ : WRITE,
				   compat_ptr(uiov), nr_segs,
				   UIO_FASTIOV, iov, &kmsg->msg_iter);
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}

/* Bleech... */
#define CMSG_COMPAT_ALIGN(len)	ALIGN((len), sizeof(s32))

#define CMSG_COMPAT_DATA(cmsg)				\
	((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
#define CMSG_COMPAT_SPACE(len)				\
	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
#define CMSG_COMPAT_LEN(len)				\
	(CMSG_COMPAT_ALIGN(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
 */
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int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
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			       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;
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	int err = -EFAULT;
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	kcmlen = 0;
	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
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	while (ucmsg != NULL) {
		if (get_user(ucmlen, &ucmsg->cmsg_len))
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			return -EFAULT;

		/* Catch bogons. */
		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
			return -EINVAL;

		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
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		tmp = CMSG_ALIGN(tmp);
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		kcmlen += tmp;
		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	}
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	if (kcmlen == 0)
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		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.
	 */
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	if (kcmlen > stackbuf_size)
		kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
	if (kcmsg == NULL)
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		return -ENOBUFS;

	/* Now copy them over neatly. */
	memset(kcmsg, 0, kcmlen);
	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
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	while (ucmsg != NULL) {
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		if (__get_user(ucmlen, &ucmsg->cmsg_len))
			goto Efault;
		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
			goto Einval;
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		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
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		if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
			goto Einval;
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		kcmsg->cmsg_len = tmp;
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		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 - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
			goto Efault;
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		/* Advance. */
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		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
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		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	}

	/* Ok, looks like we made it.  Hook it up and return success. */
	kmsg->msg_control = kcmsg_base;
	kmsg->msg_controllen = kcmlen;
	return 0;

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Einval:
	err = -EINVAL;
Efault:
	if (kcmsg_base != (struct cmsghdr *)stackbuf)
		sock_kfree_s(sk, kcmsg_base, kcmlen);
	return err;
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}

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;
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	struct compat_timeval ctv;
	struct compat_timespec cts[3];
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	int cmlen;

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	if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
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		kmsg->msg_flags |= MSG_CTRUNC;
		return 0; /* XXX: return error? check spec. */
	}

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	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;
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		}
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	}

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	cmlen = CMSG_COMPAT_LEN(len);
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	if (kmsg->msg_controllen < cmlen) {
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		kmsg->msg_flags |= MSG_CTRUNC;
		cmlen = kmsg->msg_controllen;
	}
	cmhdr.cmsg_level = level;
	cmhdr.cmsg_type = type;
	cmhdr.cmsg_len = cmlen;

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	if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
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		return -EFAULT;
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	if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
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		return -EFAULT;
	cmlen = CMSG_COMPAT_SPACE(len);
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	if (kmsg->msg_controllen < cmlen)
		cmlen = kmsg->msg_controllen;
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	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;
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		err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
					  ? O_CLOEXEC : 0);
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		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. */
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		fd_install(new_fd, get_file(fp[i]));
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	}

	if (i > 0) {
		int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
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		err = put_user(SOL_SOCKET, &cm->cmsg_level);
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		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);
}

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static int do_set_attach_filter(struct socket *sock, int level, int optname,
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				char __user *optval, unsigned int optlen)
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{
	struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
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	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
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	compat_uptr_t ptr;
	u16 len;

	if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
	    !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
	    __get_user(len, &fprog32->len) ||
	    __get_user(ptr, &fprog32->filter) ||
	    __put_user(len, &kfprog->len) ||
	    __put_user(compat_ptr(ptr), &kfprog->filter))
		return -EFAULT;

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	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
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			      sizeof(struct sock_fprog));
}

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static int do_set_sock_timeout(struct socket *sock, int level,
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		int optname, char __user *optval, unsigned int optlen)
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{
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	struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
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	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);
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	err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
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	set_fs(old_fs);

	return err;
}

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static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
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				char __user *optval, unsigned int optlen)
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{
	if (optname == SO_ATTACH_FILTER)
		return do_set_attach_filter(sock, level, optname,
					    optval, optlen);
	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
		return do_set_sock_timeout(sock, level, optname, optval, optlen);

	return sock_setsockopt(sock, level, optname, optval, optlen);
}

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COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		       char __user *, optval, unsigned int, optlen)
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{
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	int err;
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	struct socket *sock = sockfd_lookup(fd, &err);
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	if (sock) {
		err = security_socket_setsockopt(sock, level, optname);
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		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;
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}

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static int do_get_sock_timeout(struct socket *sock, int level, int optname,
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		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);
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	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
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	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;
}

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static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
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				char __user *optval, int __user *optlen)
{
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	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
		return do_get_sock_timeout(sock, level, optname, optval, optlen);
	return sock_getsockopt(sock, level, optname, optval, optlen);
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}

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int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
{
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	struct compat_timeval __user *ctv;
	int err;
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	struct timeval tv;
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	if (COMPAT_USE_64BIT_TIME)
		return sock_get_timestamp(sk, userstamp);

	ctv = (struct compat_timeval __user *) userstamp;
	err = -ENOENT;
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	if (!sock_flag(sk, SOCK_TIMESTAMP))
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		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
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	tv = ktime_to_timeval(sk->sk_stamp);
	if (tv.tv_sec == -1)
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		return err;
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	if (tv.tv_sec == 0) {
		sk->sk_stamp = ktime_get_real();
		tv = ktime_to_timeval(sk->sk_stamp);
	}
	err = 0;
	if (put_user(tv.tv_sec, &ctv->tv_sec) ||
			put_user(tv.tv_usec, &ctv->tv_usec))
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		err = -EFAULT;
	return err;
}
EXPORT_SYMBOL(compat_sock_get_timestamp);

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int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
{
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	struct compat_timespec __user *ctv;
	int err;
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	struct timespec ts;

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	if (COMPAT_USE_64BIT_TIME)
		return sock_get_timestampns (sk, userstamp);

	ctv = (struct compat_timespec __user *) userstamp;
	err = -ENOENT;
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	if (!sock_flag(sk, SOCK_TIMESTAMP))
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		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
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	ts = ktime_to_timespec(sk->sk_stamp);
	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);
	}
	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);

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COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		       char __user *, optval, int __user *, optlen)
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{
	int err;
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	struct socket *sock = sockfd_lookup(fd, &err);
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	if (sock) {
		err = security_socket_getsockopt(sock, level, optname);
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		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;
}
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struct compat_group_req {
	__u32				 gr_interface;
	struct __kernel_sockaddr_storage gr_group
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		__aligned(4);
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} __packed;
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struct compat_group_source_req {
	__u32				 gsr_interface;
	struct __kernel_sockaddr_storage gsr_group
522
		__aligned(4);
523
	struct __kernel_sockaddr_storage gsr_source
524
		__aligned(4);
525
} __packed;
526 527 528 529

struct compat_group_filter {
	__u32				 gf_interface;
	struct __kernel_sockaddr_storage gf_group
530
		__aligned(4);
531 532 533
	__u32				 gf_fmode;
	__u32				 gf_numsrc;
	struct __kernel_sockaddr_storage gf_slist[1]
534
		__aligned(4);
535
} __packed;
536

537 538 539
#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
			sizeof(struct __kernel_sockaddr_storage))

540 541

int compat_mc_setsockopt(struct sock *sock, int level, int optname,
542
	char __user *optval, unsigned int optlen,
543
	int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
{
	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;
574
		struct group_source_req __user *kgsr = compat_alloc_user_space(
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594
			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;
595
		struct group_filter __user *kgf;
596 597
		u32 interface, fmode, numsrc;

598
		if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
		    __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)) ||
614
		    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
615 616 617 618 619 620 621 622 623 624 625 626 627
				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);

628 629
int compat_mc_getsockopt(struct sock *sock, int level, int optname,
	char __user *optval, int __user *optlen,
630
	int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665
{
	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) ||
666
	    copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
		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;
699
		if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
700 701 702 703 704 705
			return -EFAULT;
	}
	return err;
}
EXPORT_SYMBOL(compat_mc_getsockopt);

706

L
Linus Torvalds 已提交
707 708
/* Argument list sizes for compat_sys_socketcall */
#define AL(x) ((x) * sizeof(u32))
709
static unsigned char nas[21] = {
710 711 712
	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),
713
	AL(4), AL(5), AL(4)
714
};
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715 716
#undef AL

717
COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
L
Linus Torvalds 已提交
718
{
719
	return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
L
Linus Torvalds 已提交
720 721
}

722 723
COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
		       unsigned int, vlen, unsigned int, flags)
724 725 726 727 728
{
	return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
			      flags | MSG_CMSG_COMPAT);
}

729
COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
L
Linus Torvalds 已提交
730
{
731
	return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
L
Linus Torvalds 已提交
732 733
}

734
COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
735 736 737 738
{
	return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
}

739 740 741
COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
		       unsigned int, flags, struct sockaddr __user *, addr,
		       int __user *, addrlen)
742 743 744 745
{
	return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
}

746 747 748
COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
		       unsigned int, vlen, unsigned int, flags,
		       struct compat_timespec __user *, timeout)
749 750 751 752
{
	int datagrams;
	struct timespec ktspec;

753 754 755 756
	if (timeout == NULL)
		return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
				      flags | MSG_CMSG_COMPAT, NULL);

757
	if (compat_get_timespec(&ktspec, timeout))
758 759 760 761
		return -EFAULT;

	datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
				   flags | MSG_CMSG_COMPAT, &ktspec);
762
	if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
763 764 765 766 767
		datagrams = -EFAULT;

	return datagrams;
}

768
COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
L
Linus Torvalds 已提交
769 770 771 772
{
	int ret;
	u32 a[6];
	u32 a0, a1;
773

774
	if (call < SYS_SOCKET || call > SYS_SENDMMSG)
L
Linus Torvalds 已提交
775 776 777 778 779
		return -EINVAL;
	if (copy_from_user(a, args, nas[call]))
		return -EFAULT;
	a0 = a[0];
	a1 = a[1];
780

781
	switch (call) {
L
Linus Torvalds 已提交
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	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:
U
Ulrich Drepper 已提交
795
		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
L
Linus Torvalds 已提交
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
		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_send(a0, compat_ptr(a1), a[2], a[3]);
		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:
813
		ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
L
Linus Torvalds 已提交
814 815
		break;
	case SYS_RECVFROM:
816 817
		ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
					  compat_ptr(a[4]), compat_ptr(a[5]));
L
Linus Torvalds 已提交
818 819
		break;
	case SYS_SHUTDOWN:
820
		ret = sys_shutdown(a0, a1);
L
Linus Torvalds 已提交
821 822 823 824 825 826 827 828 829 830 831 832
		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;
833 834 835
	case SYS_SENDMMSG:
		ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
		break;
L
Linus Torvalds 已提交
836 837 838
	case SYS_RECVMSG:
		ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
		break;
839 840 841 842
	case SYS_RECVMMSG:
		ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
					  compat_ptr(a[4]));
		break;
U
Ulrich Drepper 已提交
843 844
	case SYS_ACCEPT4:
		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
U
Ulrich Drepper 已提交
845
		break;
L
Linus Torvalds 已提交
846 847 848 849 850 851
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}
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