2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/kern/imgact_resident.c,v 1.17 2007/04/30 07:18:53 dillon Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/sysproto.h>
42 #include <sys/imgact.h>
43 #include <sys/imgact_aout.h>
46 #include <sys/resourcevar.h>
47 #include <sys/sysent.h>
48 #include <sys/systm.h>
50 #include <sys/vnode.h>
51 #include <sys/inflate.h>
52 #include <sys/sysctl.h>
54 #include <sys/resident.h>
57 #include <vm/vm_param.h>
59 #include <vm/vm_map.h>
60 #include <vm/vm_kern.h>
61 #include <vm/vm_extern.h>
63 #include <sys/sysref2.h>
65 static int exec_res_id = 0;
67 static TAILQ_HEAD(,vmresident) exec_res_list;
69 static MALLOC_DEFINE(M_EXEC_RES, "vmresident", "resident execs");
71 /* lockmgr lock for protecting the exec_res_list */
72 static struct lock exec_list_lock;
75 vm_resident_init(void *__dummy)
77 lockinit(&exec_list_lock, "vmres", 0, 0);
78 TAILQ_INIT(&exec_res_list);
80 SYSINIT(vmres, SI_BOOT1_LOCK, SI_ORDER_ANY, vm_resident_init, 0);
83 fill_xresident(struct vmresident *vr, struct xresident *in, struct thread *td)
91 in->res_entry_addr = vr->vr_entry_addr;
92 in->res_id = vr->vr_id;
94 char *freepath, *fullpath;
95 error = vn_fullpath(td->td_proc, vrtmp, &fullpath, &freepath);
97 /* could not retrieve cached path, return zero'ed string */
98 bzero(in->res_file, MAXPATHLEN);
101 strlcpy(in->res_file, fullpath, sizeof(in->res_file));
102 kfree(freepath, M_TEMP);
105 /* indicate that we are using the vnode */
106 error = vget(vrtmp, LK_EXCLUSIVE);
110 /* retrieve underlying stat information and release vnode */
111 error = vn_stat(vrtmp, &st, td->td_proc->p_ucred);
121 kprintf("fill_xresident, error = %d\n", error);
126 sysctl_vm_resident(SYSCTL_HANDLER_ARGS)
128 struct vmresident *vmres;
133 /* only super-user should call this sysctl */
135 if ((suser(td)) != 0)
140 if (exec_res_id == 0)
143 /* client queried for number of resident binaries */
145 return SYSCTL_OUT(req, 0, exec_res_id);
147 lockmgr(&exec_list_lock, LK_SHARED);
148 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) {
149 struct xresident xres;
150 error = fill_xresident(vmres, &xres, td);
154 error = SYSCTL_OUT(req, (void *)&xres,
155 sizeof(struct xresident));
159 lockmgr(&exec_list_lock, LK_RELEASE);
163 SYSCTL_PROC(_vm, OID_AUTO, resident, CTLTYPE_OPAQUE|CTLFLAG_RD, 0, 0,
164 sysctl_vm_resident, "S,xresident", "resident executables (sys/resident.h)");
167 exec_resident_imgact(struct image_params *imgp)
169 struct vmresident *vmres;
172 * resident image activator
174 if ((vmres = imgp->vp->v_resident) == NULL)
176 exec_new_vmspace(imgp, vmres->vr_vmspace);
178 imgp->interpreted = 0;
179 imgp->proc->p_sysent = vmres->vr_sysent;
180 imgp->entry_addr = vmres->vr_entry_addr;
185 * exec_sys_register(entry)
187 * Register ourselves for resident execution. Only root can do this. This
188 * will snapshot the vmspace and cause future exec's of the specified binary
189 * to use the snapshot directly rather then load & relocate a new copy.
192 sys_exec_sys_register(struct exec_sys_register_args *uap)
194 struct vmresident *vmres;
200 if ((error = suser_cred(p->p_ucred, 0)) != 0)
202 if ((vp = p->p_textvp) == NULL)
207 vmres = kmalloc(sizeof(*vmres), M_EXEC_RES, M_WAITOK);
208 vp->v_resident = vmres;
209 vmres->vr_vnode = vp;
210 vmres->vr_sysent = p->p_sysent;
211 vmres->vr_id = ++exec_res_id;
212 vmres->vr_entry_addr = (intptr_t)uap->entry;
213 vmres->vr_vmspace = vmspace_fork(p->p_vmspace); /* XXX order */
215 lockmgr(&exec_list_lock, LK_EXCLUSIVE);
216 TAILQ_INSERT_TAIL(&exec_res_list, vmres, vr_link);
217 lockmgr(&exec_list_lock, LK_RELEASE);
223 * exec_sys_unregister(id)
225 * Unregister the specified id. If an id of -1 is used unregister
226 * the registration associated with the current process. An id of -2
227 * unregisters everything.
230 sys_exec_sys_unregister(struct exec_sys_unregister_args *uap)
232 struct vmresident *vmres;
239 if ((error = suser_cred(p->p_ucred, 0)) != 0)
243 * If id is -1, unregister ourselves
245 if ((id = uap->id) == -1 && p->p_textvp && p->p_textvp->v_resident)
246 id = p->p_textvp->v_resident->vr_id;
249 * Look for the registration
254 lockmgr(&exec_list_lock, LK_EXCLUSIVE);
256 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) {
257 if (id == -2 || vmres->vr_id == id) {
258 TAILQ_REMOVE(&exec_res_list, vmres, vr_link);
259 if (vmres->vr_vnode) {
260 vmres->vr_vnode->v_resident = NULL;
261 vdrop(vmres->vr_vnode);
262 vmres->vr_vnode = NULL;
264 if (vmres->vr_vmspace) {
265 sysref_put(&vmres->vr_vmspace->vm_sysref);
266 vmres->vr_vmspace = NULL;
268 kfree(vmres, M_EXEC_RES);
275 lockmgr(&exec_list_lock, LK_RELEASE);
277 uap->sysmsg_result = count;