1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/*-
* Copyright (c) 2001 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by NAI Labs, the
* Security Research Division of Network Associates, Inc. under
* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
* CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include "lomacfs.h"
#include "kernel_plm.h"
int
lomacfs_node_alloc(struct mount *mp, struct componentname *cnp,
struct vnode *dvp, struct vnode *lowervp, struct vnode **vpp) {
lomac_object_t lobj;
struct thread *td = curthread;
struct vnode *vp;
struct lomac_node *lp;
lattr_t subjlattr, objlattr;
int error;
KASSERT((cnp == NULL) == (dvp == NULL),
("lomacfs_node_alloc: dvp and cnp do not match"));
lp = malloc(sizeof(*lp), M_LOMACFS, M_WAITOK);
if (dvp != NULL) {
error = cache_lookup(dvp, vpp, cnp);
if (error == -1) { /* lost the race; return EEXIST and the vp */
vput(lowervp);
error = vget(*vpp, LK_EXCLUSIVE, td);
free(lp, M_LOMACFS);
if (error) {
*vpp = NULL;
return (error);
} else
return (EEXIST);
}
}
error = getnewvnode(VT_NULL, mp, lomacfs_vnodeop_p, vpp);
if (error) {
vput(lowervp);
free(lp, M_LOMACFS);
return (error);
}
vp = *vpp;
vp->v_type = lowervp != NULL ? lowervp->v_type : VBAD;
if (vp->v_type == VCHR)
vp->v_rdev = lowervp->v_rdev;
vp->v_data = lp;
lp->ln_vp = vp;
lp->ln_lowervp = lowervp;
if (lowervp != NULL)
vhold(lowervp);
get_subject_lattr(curthread->td_proc, &subjlattr);
lp->ln_flags = 0;
lomac_plm_init_lomacfs_vnode(dvp, vp, cnp, &subjlattr);
/* retrieve the just-initialized attributes */
lobj.lo_type = LO_TYPE_LVNODE;
lobj.lo_object.vnode = vp;
get_object_lattr(&lobj, &objlattr);
/* propogate the lattr to the underlying vnode */
lobj.lo_type = LO_TYPE_UVNODE;
lobj.lo_object.vnode = lowervp;
set_object_lattr(&lobj, objlattr);
#if defined(LOMAC_DEBUG_INCNAME)
if (cnp == NULL)
strncpy(lp->ln_name, "/", sizeof(lp->ln_name));
else {
strncpy(lp->ln_name, cnp->cn_nameptr, cnp->cn_namelen);
lp->ln_name[cnp->cn_namelen] = '\0';
}
#endif
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_THISLAYER, td);
if (error)
panic("lomacfs_node_alloc: can't lock new vnode\n");
if (cnp == NULL)
vp->v_flag |= VROOT;
else if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, vp, cnp);
#if defined(LOMAC_DEBUG_NODE_ALLOC)
printf("lomacfs: made vp %p for lvp %p \"%.*s\" in dvp %p from %s\n",
vp, lowervp, cnp ? (int)cnp->cn_namelen : 0,
cnp ? cnp->cn_nameptr : "", dvp,
lowervp != NULL ? lowervp->v_mount->mnt_stat.f_mntonname : "");
#endif
return (0);
}
|
