4 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
6 * This code is derived from software contributed to The DragonFly Project
7 * by Matthew Dillon <dillon@backplane.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
19 * 3. Neither the name of The DragonFly Project nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific, prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * $DragonFly: src/sys/kern/imgact_resident.c,v 1.17 2007/04/30 07:18:53 dillon Exp $
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/sysproto.h>
44 #include <sys/imgact.h>
45 #include <sys/imgact_aout.h>
49 #include <sys/resourcevar.h>
50 #include <sys/sysent.h>
51 #include <sys/systm.h>
53 #include <sys/vnode.h>
54 #include <sys/inflate.h>
55 #include <sys/sysctl.h>
57 #include <sys/resident.h>
60 #include <vm/vm_param.h>
62 #include <vm/vm_map.h>
63 #include <vm/vm_kern.h>
64 #include <vm/vm_extern.h>
66 #include <sys/sysref2.h>
68 static int exec_res_id = 0;
70 static TAILQ_HEAD(,vmresident) exec_res_list;
72 static MALLOC_DEFINE(M_EXEC_RES, "vmresident", "resident execs");
74 /* lockmgr lock for protecting the exec_res_list */
75 static struct lock exec_list_lock;
78 vm_resident_init(void *__dummy)
80 lockinit(&exec_list_lock, "vmres", 0, 0);
81 TAILQ_INIT(&exec_res_list);
83 SYSINIT(vmres, SI_BOOT1_LOCK, SI_ORDER_ANY, vm_resident_init, 0);
86 fill_xresident(struct vmresident *vr, struct xresident *in, struct thread *td)
94 in->res_entry_addr = vr->vr_entry_addr;
95 in->res_id = vr->vr_id;
97 char *freepath, *fullpath;
98 error = vn_fullpath(td->td_proc, vrtmp, &fullpath, &freepath, 0);
100 /* could not retrieve cached path, return zero'ed string */
101 bzero(in->res_file, MAXPATHLEN);
104 strlcpy(in->res_file, fullpath, sizeof(in->res_file));
105 kfree(freepath, M_TEMP);
108 /* indicate that we are using the vnode */
109 error = vget(vrtmp, LK_EXCLUSIVE);
113 /* retrieve underlying stat information and release vnode */
114 error = vn_stat(vrtmp, &st, td->td_ucred);
124 kprintf("fill_xresident, error = %d\n", error);
129 sysctl_vm_resident(SYSCTL_HANDLER_ARGS)
131 struct vmresident *vmres;
136 /* only super-user should call this sysctl */
138 if ((priv_check(td, PRIV_VM_RESIDENT)) != 0)
143 if (exec_res_id == 0)
146 /* client queried for number of resident binaries */
148 return SYSCTL_OUT(req, 0, exec_res_id);
150 lockmgr(&exec_list_lock, LK_SHARED);
152 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) {
153 struct xresident xres;
154 error = fill_xresident(vmres, &xres, td);
158 error = SYSCTL_OUT(req, (void *)&xres,
159 sizeof(struct xresident));
163 lockmgr(&exec_list_lock, LK_RELEASE);
167 SYSCTL_PROC(_vm, OID_AUTO, resident, CTLTYPE_OPAQUE|CTLFLAG_RD, 0, 0,
168 sysctl_vm_resident, "S,xresident", "resident executables (sys/resident.h)");
171 exec_resident_imgact(struct image_params *imgp)
173 struct vmresident *vmres;
176 * resident image activator
178 lockmgr(&exec_list_lock, LK_SHARED);
179 if ((vmres = imgp->vp->v_resident) == NULL) {
180 lockmgr(&exec_list_lock, LK_RELEASE);
183 atomic_add_int(&vmres->vr_refs, 1);
184 lockmgr(&exec_list_lock, LK_RELEASE);
187 * We want to exec the new vmspace without holding the lock to
188 * improve concurrency.
190 exec_new_vmspace(imgp, vmres->vr_vmspace);
192 imgp->interpreted = 0;
193 imgp->proc->p_sysent = vmres->vr_sysent;
194 imgp->entry_addr = vmres->vr_entry_addr;
195 atomic_subtract_int(&vmres->vr_refs, 1);
201 * exec_sys_register(entry)
203 * Register ourselves for resident execution. Only root (i.e. a process with
204 * PRIV_VM_RESIDENT credentials) can do this. This
205 * will snapshot the vmspace and cause future exec's of the specified binary
206 * to use the snapshot directly rather then load & relocate a new copy.
211 sys_exec_sys_register(struct exec_sys_register_args *uap)
213 struct thread *td = curthread;
214 struct vmresident *vmres;
220 error = priv_check_cred(td->td_ucred, PRIV_VM_RESIDENT, 0);
224 if ((vp = p->p_textvp) == NULL)
227 lockmgr(&exec_list_lock, LK_EXCLUSIVE);
229 if (vp->v_resident) {
230 lockmgr(&exec_list_lock, LK_RELEASE);
235 vmres = kmalloc(sizeof(*vmres), M_EXEC_RES, M_WAITOK | M_ZERO);
236 vmres->vr_vnode = vp;
237 vmres->vr_sysent = p->p_sysent;
238 vmres->vr_id = ++exec_res_id;
239 vmres->vr_entry_addr = (intptr_t)uap->entry;
240 vmres->vr_vmspace = vmspace_fork(p->p_vmspace); /* XXX order */
241 pmap_pinit2(vmspace_pmap(vmres->vr_vmspace));
242 vp->v_resident = vmres;
244 TAILQ_INSERT_TAIL(&exec_res_list, vmres, vr_link);
245 lockmgr(&exec_list_lock, LK_RELEASE);
251 * exec_sys_unregister(id)
253 * Unregister the specified id. If an id of -1 is used unregister
254 * the registration associated with the current process. An id of -2
255 * unregisters everything.
260 sys_exec_sys_unregister(struct exec_sys_unregister_args *uap)
262 struct thread *td = curthread;
263 struct vmresident *vmres;
270 error = priv_check_cred(td->td_ucred, PRIV_VM_RESIDENT, 0);
275 * If id is -1, unregister ourselves
277 lockmgr(&exec_list_lock, LK_EXCLUSIVE);
279 if ((id = uap->id) == -1 && p->p_textvp && p->p_textvp->v_resident)
280 id = p->p_textvp->v_resident->vr_id;
283 * Look for the registration
289 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) {
290 if (id == -2 || vmres->vr_id == id) {
292 * Check race against exec
294 if (vmres->vr_refs) {
295 lockmgr(&exec_list_lock, LK_RELEASE);
296 tsleep(vmres, 0, "vmres", 1);
297 lockmgr(&exec_list_lock, LK_EXCLUSIVE);
304 TAILQ_REMOVE(&exec_res_list, vmres, vr_link);
305 if (vmres->vr_vnode) {
306 vmres->vr_vnode->v_resident = NULL;
307 vdrop(vmres->vr_vnode);
308 vmres->vr_vnode = NULL;
310 if (vmres->vr_vmspace) {
311 sysref_put(&vmres->vr_vmspace->vm_sysref);
312 vmres->vr_vmspace = NULL;
314 kfree(vmres, M_EXEC_RES);
321 lockmgr(&exec_list_lock, LK_RELEASE);
324 uap->sysmsg_result = count;