[deliverable/linux.git] / net / core / scm.c

/* scm.c - Socket level control messages processing.
 *
 * Author:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *              Alignment and value checking mods by Craig Metz
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/signal.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/stat.h>
#include <linux/socket.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/security.h>
#include <linux/pid_namespace.h>
#include <linux/pid.h>
#include <linux/nsproxy.h>
#include <linux/slab.h>

#include <asm/uaccess.h>

#include <net/protocol.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/compat.h>
#include <net/scm.h>
#include <net/cls_cgroup.h>


/*
 *	Only allow a user to send credentials, that they could set with
 *	setu(g)id.
 */

static __inline__ int scm_check_creds(struct ucred *creds)
{
	const struct cred *cred = current_cred();
	kuid_t uid = make_kuid(cred->user_ns, creds->uid);
	kgid_t gid = make_kgid(cred->user_ns, creds->gid);

	if (!uid_valid(uid) || !gid_valid(gid))
		return -EINVAL;

	if ((creds->pid == task_tgid_vnr(current) ||
	     ns_capable(task_active_pid_ns(current)->user_ns, CAP_SYS_ADMIN)) &&
	    ((uid_eq(uid, cred->uid)   || uid_eq(uid, cred->euid) ||
	      uid_eq(uid, cred->suid)) || ns_capable(cred->user_ns, CAP_SETUID)) &&
	    ((gid_eq(gid, cred->gid)   || gid_eq(gid, cred->egid) ||
	      gid_eq(gid, cred->sgid)) || ns_capable(cred->user_ns, CAP_SETGID))) {
	       return 0;
	}
	return -EPERM;
}

static int scm_fp_copy(struct cmsghdr *cmsg, struct scm_fp_list **fplp)
{
	int *fdp = (int*)CMSG_DATA(cmsg);
	struct scm_fp_list *fpl = *fplp;
	struct file **fpp;
	int i, num;

	num = (cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)))/sizeof(int);

	if (num <= 0)
		return 0;

	if (num > SCM_MAX_FD)
		return -EINVAL;

	if (!fpl)
	{
		fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL);
		if (!fpl)
			return -ENOMEM;
		*fplp = fpl;
		fpl->count = 0;
		fpl->max = SCM_MAX_FD;
		fpl->user = NULL;
	}
	fpp = &fpl->fp[fpl->count];

	if (fpl->count + num > fpl->max)
		return -EINVAL;

	/*
	 *	Verify the descriptors and increment the usage count.
	 */

	for (i=0; i< num; i++)
	{
		int fd = fdp[i];
		struct file *file;

		if (fd < 0 || !(file = fget_raw(fd)))
			return -EBADF;
		*fpp++ = file;
		fpl->count++;
	}

	if (!fpl->user)
		fpl->user = get_uid(current_user());

	return num;
}

void __scm_destroy(struct scm_cookie *scm)
{
	struct scm_fp_list *fpl = scm->fp;
	int i;

	if (fpl) {
		scm->fp = NULL;
		for (i=fpl->count-1; i>=0; i--)
			fput(fpl->fp[i]);
		free_uid(fpl->user);
		kfree(fpl);
	}
}
EXPORT_SYMBOL(__scm_destroy);

int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *p)
{
	struct cmsghdr *cmsg;
	int err;

	for_each_cmsghdr(cmsg, msg) {
		err = -EINVAL;

		/* Verify that cmsg_len is at least sizeof(struct cmsghdr) */
		/* The first check was omitted in <= 2.2.5. The reasoning was
		   that parser checks cmsg_len in any case, so that
		   additional check would be work duplication.
		   But if cmsg_level is not SOL_SOCKET, we do not check
		   for too short ancillary data object at all! Oops.
		   OK, let's add it...
		 */
		if (!CMSG_OK(msg, cmsg))
			goto error;

		if (cmsg->cmsg_level != SOL_SOCKET)
			continue;

		switch (cmsg->cmsg_type)
		{
		case SCM_RIGHTS:
			if (!sock->ops || sock->ops->family != PF_UNIX)
				goto error;
			err=scm_fp_copy(cmsg, &p->fp);
			if (err<0)
				goto error;
			break;
		case SCM_CREDENTIALS:
		{
			struct ucred creds;
			kuid_t uid;
			kgid_t gid;
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct ucred)))
				goto error;
			memcpy(&creds, CMSG_DATA(cmsg), sizeof(struct ucred));
			err = scm_check_creds(&creds);
			if (err)
				goto error;

			p->creds.pid = creds.pid;
			if (!p->pid || pid_vnr(p->pid) != creds.pid) {
				struct pid *pid;
				err = -ESRCH;
				pid = find_get_pid(creds.pid);
				if (!pid)
					goto error;
				put_pid(p->pid);
				p->pid = pid;
			}

			err = -EINVAL;
			uid = make_kuid(current_user_ns(), creds.uid);
			gid = make_kgid(current_user_ns(), creds.gid);
			if (!uid_valid(uid) || !gid_valid(gid))
				goto error;

			p->creds.uid = uid;
			p->creds.gid = gid;
			break;
		}
		default:
			goto error;
		}
	}

	if (p->fp && !p->fp->count)
	{
		kfree(p->fp);
		p->fp = NULL;
	}
	return 0;

error:
	scm_destroy(p);
	return err;
}
EXPORT_SYMBOL(__scm_send);

int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
{
	struct cmsghdr __user *cm
		= (__force struct cmsghdr __user *)msg->msg_control;
	struct cmsghdr cmhdr;
	int cmlen = CMSG_LEN(len);
	int err;

	if (MSG_CMSG_COMPAT & msg->msg_flags)
		return put_cmsg_compat(msg, level, type, len, data);

	if (cm==NULL || msg->msg_controllen < sizeof(*cm)) {
		msg->msg_flags |= MSG_CTRUNC;
		return 0; /* XXX: return error? check spec. */
	}
	if (msg->msg_controllen < cmlen) {
		msg->msg_flags |= MSG_CTRUNC;
		cmlen = msg->msg_controllen;
	}
	cmhdr.cmsg_level = level;
	cmhdr.cmsg_type = type;
	cmhdr.cmsg_len = cmlen;

	err = -EFAULT;
	if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
		goto out;
	if (copy_to_user(CMSG_DATA(cm), data, cmlen - sizeof(struct cmsghdr)))
		goto out;
	cmlen = CMSG_SPACE(len);
	if (msg->msg_controllen < cmlen)
		cmlen = msg->msg_controllen;
	msg->msg_control += cmlen;
	msg->msg_controllen -= cmlen;
	err = 0;
out:
	return err;
}
EXPORT_SYMBOL(put_cmsg);

void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
{
	struct cmsghdr __user *cm
		= (__force struct cmsghdr __user*)msg->msg_control;

	int fdmax = 0;
	int fdnum = scm->fp->count;
	struct file **fp = scm->fp->fp;
	int __user *cmfptr;
	int err = 0, i;

	if (MSG_CMSG_COMPAT & msg->msg_flags) {
		scm_detach_fds_compat(msg, scm);
		return;
	}

	if (msg->msg_controllen > sizeof(struct cmsghdr))
		fdmax = ((msg->msg_controllen - sizeof(struct cmsghdr))
			 / sizeof(int));

	if (fdnum < fdmax)
		fdmax = fdnum;

	for (i=0, cmfptr=(__force int __user *)CMSG_DATA(cm); i<fdmax;
	     i++, cmfptr++)
	{
		struct socket *sock;
		int new_fd;
		err = security_file_receive(fp[i]);
		if (err)
			break;
		err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & msg->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. */
		sock = sock_from_file(fp[i], &err);
		if (sock) {
			sock_update_netprioidx(&sock->sk->sk_cgrp_data);
			sock_update_classid(&sock->sk->sk_cgrp_data);
		}
		fd_install(new_fd, get_file(fp[i]));
	}

	if (i > 0)
	{
		int cmlen = CMSG_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_SPACE(i*sizeof(int));
			if (msg->msg_controllen < cmlen)
				cmlen = msg->msg_controllen;
			msg->msg_control += cmlen;
			msg->msg_controllen -= cmlen;
		}
	}
	if (i < fdnum || (fdnum && fdmax <= 0))
		msg->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);
}
EXPORT_SYMBOL(scm_detach_fds);

struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl)
{
	struct scm_fp_list *new_fpl;
	int i;

	if (!fpl)
		return NULL;

	new_fpl = kmemdup(fpl, offsetof(struct scm_fp_list, fp[fpl->count]),
			  GFP_KERNEL);
	if (new_fpl) {
		for (i = 0; i < fpl->count; i++)
			get_file(fpl->fp[i]);
		new_fpl->max = new_fpl->count;
		new_fpl->user = get_uid(fpl->user);
	}
	return new_fpl;
}
EXPORT_SYMBOL(scm_fp_dup);
Commit	Line	Data
1da177e4 LT	1	/* scm.c - Socket level control messages processing.
	2	*
	3	* Author: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	4	* Alignment and value checking mods by Craig Metz
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/signal.h>
4fc268d2	14	#include <linux/capability.h>
1da177e4 LT	15	#include <linux/errno.h>
	16	#include <linux/sched.h>
	17	#include <linux/mm.h>
	18	#include <linux/kernel.h>
1da177e4 LT	19	#include <linux/stat.h>
	20	#include <linux/socket.h>
	21	#include <linux/file.h>
	22	#include <linux/fcntl.h>
	23	#include <linux/net.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/netdevice.h>
	26	#include <linux/security.h>
92f28d97	27	#include <linux/pid_namespace.h>
b488893a PE	28	#include <linux/pid.h>
b488893a PE	29	#include <linux/nsproxy.h>
5a0e3ad6	30	#include <linux/slab.h>
1da177e4	31
1da177e4 LT	32	#include <asm/uaccess.h>
	33
	34	#include <net/protocol.h>
	35	#include <linux/skbuff.h>
	36	#include <net/sock.h>
	37	#include <net/compat.h>
	38	#include <net/scm.h>
d8429506	39	#include <net/cls_cgroup.h>
1da177e4 LT	40
	41
	42	/*
4ec93edb	43	* Only allow a user to send credentials, that they could set with
1da177e4 LT	44	* setu(g)id.
	45	*/
	46
	47	static __inline__ int scm_check_creds(struct ucred *creds)
	48	{
86a264ab	49	const struct cred *cred = current_cred();
b2e4f544 EB	50	kuid_t uid = make_kuid(cred->user_ns, creds->uid);
	51	kgid_t gid = make_kgid(cred->user_ns, creds->gid);
	52
	53	if (!uid_valid(uid) \|\| !gid_valid(gid))
	54	return -EINVAL;
b6dff3ec	55
92f28d97	56	if ((creds->pid == task_tgid_vnr(current) \|\|
d661684c	57	ns_capable(task_active_pid_ns(current)->user_ns, CAP_SYS_ADMIN)) &&
b2e4f544	58	((uid_eq(uid, cred->uid) \|\| uid_eq(uid, cred->euid) \|\|
c7b96acf	59	uid_eq(uid, cred->suid)) \|\| ns_capable(cred->user_ns, CAP_SETUID)) &&
b2e4f544	60	((gid_eq(gid, cred->gid) \|\| gid_eq(gid, cred->egid) \|\|
c7b96acf	61	gid_eq(gid, cred->sgid)) \|\| ns_capable(cred->user_ns, CAP_SETGID))) {
1da177e4 LT	62	return 0;
	63	}
	64	return -EPERM;
	65	}
	66
	67	static int scm_fp_copy(struct cmsghdr cmsg, struct scm_fp_list *fplp)
	68	{
	69	int fdp = (int)CMSG_DATA(cmsg);
	70	struct scm_fp_list fpl = fplp;
	71	struct file **fpp;
	72	int i, num;
	73
	74	num = (cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)))/sizeof(int);
	75
	76	if (num <= 0)
	77	return 0;
	78
	79	if (num > SCM_MAX_FD)
	80	return -EINVAL;
	81
	82	if (!fpl)
	83	{
	84	fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL);
	85	if (!fpl)
	86	return -ENOMEM;
	87	*fplp = fpl;
	88	fpl->count = 0;
bba14de9	89	fpl->max = SCM_MAX_FD;
415e3d3e	90	fpl->user = NULL;
1da177e4 LT	91	}
	92	fpp = &fpl->fp[fpl->count];
	93
bba14de9	94	if (fpl->count + num > fpl->max)
1da177e4	95	return -EINVAL;
4ec93edb	96
1da177e4 LT	97	/*
	98	* Verify the descriptors and increment the usage count.
	99	*/
4ec93edb	100
1da177e4 LT	101	for (i=0; i< num; i++)
	102	{
	103	int fd = fdp[i];
	104	struct file *file;
	105
326be7b4	106	if (fd < 0 \|\| !(file = fget_raw(fd)))
1da177e4 LT	107	return -EBADF;
	108	*fpp++ = file;
	109	fpl->count++;
	110	}
415e3d3e HFS	111
	112	if (!fpl->user)
	113	fpl->user = get_uid(current_user());
	114
1da177e4 LT	115	return num;
	116	}
	117
	118	void __scm_destroy(struct scm_cookie *scm)
	119	{
	120	struct scm_fp_list *fpl = scm->fp;
	121	int i;
	122
	123	if (fpl) {
	124	scm->fp = NULL;
6120d3db AV	125	for (i=fpl->count-1; i>=0; i--)
6120d3db AV	126	fput(fpl->fp[i]);
415e3d3e	127	free_uid(fpl->user);
6120d3db	128	kfree(fpl);
1da177e4 LT	129	}
1da177e4 LT	130	}
9e34a5b5	131	EXPORT_SYMBOL(__scm_destroy);
1da177e4 LT	132
	133	int __scm_send(struct socket sock, struct msghdr msg, struct scm_cookie *p)
	134	{
	135	struct cmsghdr *cmsg;
	136	int err;
	137
f95b414e	138	for_each_cmsghdr(cmsg, msg) {
1da177e4 LT	139	err = -EINVAL;
	140
	141	/* Verify that cmsg_len is at least sizeof(struct cmsghdr) */
	142	/* The first check was omitted in <= 2.2.5. The reasoning was
	143	that parser checks cmsg_len in any case, so that
	144	additional check would be work duplication.
4ec93edb	145	But if cmsg_level is not SOL_SOCKET, we do not check
1da177e4 LT	146	for too short ancillary data object at all! Oops.
	147	OK, let's add it...
	148	*/
	149	if (!CMSG_OK(msg, cmsg))
	150	goto error;
	151
	152	if (cmsg->cmsg_level != SOL_SOCKET)
	153	continue;
	154
	155	switch (cmsg->cmsg_type)
	156	{
	157	case SCM_RIGHTS:
76dadd76 EB	158	if (!sock->ops \|\| sock->ops->family != PF_UNIX)
76dadd76 EB	159	goto error;
1da177e4 LT	160	err=scm_fp_copy(cmsg, &p->fp);
	161	if (err<0)
	162	goto error;
	163	break;
	164	case SCM_CREDENTIALS:
b2e4f544	165	{
dbe9a417	166	struct ucred creds;
b2e4f544 EB	167	kuid_t uid;
b2e4f544 EB	168	kgid_t gid;
1da177e4 LT	169	if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct ucred)))
1da177e4 LT	170	goto error;
dbe9a417 EB	171	memcpy(&creds, CMSG_DATA(cmsg), sizeof(struct ucred));
dbe9a417 EB	172	err = scm_check_creds(&creds);
1da177e4 LT	173	if (err)
1da177e4 LT	174	goto error;
257b5358	175
dbe9a417 EB	176	p->creds.pid = creds.pid;
dbe9a417 EB	177	if (!p->pid \|\| pid_vnr(p->pid) != creds.pid) {
257b5358 EB	178	struct pid *pid;
257b5358 EB	179	err = -ESRCH;
dbe9a417	180	pid = find_get_pid(creds.pid);
257b5358 EB	181	if (!pid)
	182	goto error;
	183	put_pid(p->pid);
	184	p->pid = pid;
	185	}
	186
b2e4f544	187	err = -EINVAL;
dbe9a417 EB	188	uid = make_kuid(current_user_ns(), creds.uid);
dbe9a417 EB	189	gid = make_kgid(current_user_ns(), creds.gid);
b2e4f544 EB	190	if (!uid_valid(uid) \|\| !gid_valid(gid))
	191	goto error;
	192
dbe9a417 EB	193	p->creds.uid = uid;
dbe9a417 EB	194	p->creds.gid = gid;
1da177e4	195	break;
b2e4f544	196	}
1da177e4 LT	197	default:
	198	goto error;
	199	}
	200	}
	201
	202	if (p->fp && !p->fp->count)
	203	{
	204	kfree(p->fp);
	205	p->fp = NULL;
	206	}
	207	return 0;
4ec93edb	208
1da177e4 LT	209	error:
	210	scm_destroy(p);
	211	return err;
	212	}
9e34a5b5	213	EXPORT_SYMBOL(__scm_send);
1da177e4 LT	214
	215	int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
	216	{
cfcabdcc SH	217	struct cmsghdr __user *cm
cfcabdcc SH	218	= (__force struct cmsghdr __user *)msg->msg_control;
1da177e4 LT	219	struct cmsghdr cmhdr;
	220	int cmlen = CMSG_LEN(len);
	221	int err;
	222
	223	if (MSG_CMSG_COMPAT & msg->msg_flags)
	224	return put_cmsg_compat(msg, level, type, len, data);
	225
	226	if (cm==NULL \|\| msg->msg_controllen < sizeof(*cm)) {
	227	msg->msg_flags \|= MSG_CTRUNC;
	228	return 0; /* XXX: return error? check spec. */
	229	}
	230	if (msg->msg_controllen < cmlen) {
	231	msg->msg_flags \|= MSG_CTRUNC;
	232	cmlen = msg->msg_controllen;
	233	}
	234	cmhdr.cmsg_level = level;
	235	cmhdr.cmsg_type = type;
	236	cmhdr.cmsg_len = cmlen;
	237
	238	err = -EFAULT;
	239	if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
4ec93edb	240	goto out;
1da177e4 LT	241	if (copy_to_user(CMSG_DATA(cm), data, cmlen - sizeof(struct cmsghdr)))
	242	goto out;
	243	cmlen = CMSG_SPACE(len);
1ac70e7a WY	244	if (msg->msg_controllen < cmlen)
1ac70e7a WY	245	cmlen = msg->msg_controllen;
1da177e4 LT	246	msg->msg_control += cmlen;
	247	msg->msg_controllen -= cmlen;
	248	err = 0;
	249	out:
	250	return err;
	251	}
9e34a5b5	252	EXPORT_SYMBOL(put_cmsg);
1da177e4 LT	253
	254	void scm_detach_fds(struct msghdr msg, struct scm_cookie scm)
	255	{
cfcabdcc SH	256	struct cmsghdr __user *cm
cfcabdcc SH	257	= (__force struct cmsghdr __user*)msg->msg_control;
1da177e4 LT	258
	259	int fdmax = 0;
	260	int fdnum = scm->fp->count;
	261	struct file **fp = scm->fp->fp;
	262	int __user *cmfptr;
	263	int err = 0, i;
	264
	265	if (MSG_CMSG_COMPAT & msg->msg_flags) {
	266	scm_detach_fds_compat(msg, scm);
	267	return;
	268	}
	269
	270	if (msg->msg_controllen > sizeof(struct cmsghdr))
	271	fdmax = ((msg->msg_controllen - sizeof(struct cmsghdr))
	272	/ sizeof(int));
	273
	274	if (fdnum < fdmax)
	275	fdmax = fdnum;
	276
cfcabdcc SH	277	for (i=0, cmfptr=(__force int __user *)CMSG_DATA(cm); i<fdmax;
cfcabdcc SH	278	i++, cmfptr++)
1da177e4	279	{
48a87cc2	280	struct socket *sock;
1da177e4 LT	281	int new_fd;
	282	err = security_file_receive(fp[i]);
	283	if (err)
	284	break;
4a19542e UD	285	err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & msg->msg_flags
4a19542e UD	286	? O_CLOEXEC : 0);
1da177e4 LT	287	if (err < 0)
	288	break;
	289	new_fd = err;
	290	err = put_user(new_fd, cmfptr);
	291	if (err) {
	292	put_unused_fd(new_fd);
	293	break;
	294	}
	295	/* Bump the usage count and install the file. */
48a87cc2	296	sock = sock_from_file(fp[i], &err);
d8429506	297	if (sock) {
2a56a1fe TH	298	sock_update_netprioidx(&sock->sk->sk_cgrp_data);
2a56a1fe TH	299	sock_update_classid(&sock->sk->sk_cgrp_data);
d8429506	300	}
cb0942b8	301	fd_install(new_fd, get_file(fp[i]));
1da177e4 LT	302	}
	303
	304	if (i > 0)
	305	{
	306	int cmlen = CMSG_LEN(i*sizeof(int));
effee6a0	307	err = put_user(SOL_SOCKET, &cm->cmsg_level);
1da177e4 LT	308	if (!err)
	309	err = put_user(SCM_RIGHTS, &cm->cmsg_type);
	310	if (!err)
	311	err = put_user(cmlen, &cm->cmsg_len);
	312	if (!err) {
	313	cmlen = CMSG_SPACE(i*sizeof(int));
6900317f DB	314	if (msg->msg_controllen < cmlen)
6900317f DB	315	cmlen = msg->msg_controllen;
1da177e4 LT	316	msg->msg_control += cmlen;
	317	msg->msg_controllen -= cmlen;
	318	}
	319	}
	320	if (i < fdnum \|\| (fdnum && fdmax <= 0))
	321	msg->msg_flags \|= MSG_CTRUNC;
	322
	323	/*
	324	* All of the files that fit in the message have had their
	325	* usage counts incremented, so we just free the list.
	326	*/
	327	__scm_destroy(scm);
	328	}
9e34a5b5	329	EXPORT_SYMBOL(scm_detach_fds);
1da177e4 LT	330
	331	struct scm_fp_list scm_fp_dup(struct scm_fp_list fpl)
	332	{
	333	struct scm_fp_list *new_fpl;
	334	int i;
	335
	336	if (!fpl)
	337	return NULL;
	338
bba14de9 ED	339	new_fpl = kmemdup(fpl, offsetof(struct scm_fp_list, fp[fpl->count]),
bba14de9 ED	340	GFP_KERNEL);
1da177e4	341	if (new_fpl) {
bba14de9	342	for (i = 0; i < fpl->count; i++)
1da177e4	343	get_file(fpl->fp[i]);
bba14de9	344	new_fpl->max = new_fpl->count;
415e3d3e	345	new_fpl->user = get_uid(fpl->user);
1da177e4 LT	346	}
	347	return new_fpl;
	348	}
1da177e4	349	EXPORT_SYMBOL(scm_fp_dup);