1 /* 2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 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 16 * distribution. 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. 20 * 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 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/kern/imgact_resident.c,v 1.7 2005/01/31 17:53:57 joerg Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/sysproto.h> 41 #include <sys/exec.h> 42 #include <sys/imgact.h> 43 #include <sys/imgact_aout.h> 44 #include <sys/mman.h> 45 #include <sys/proc.h> 46 #include <sys/resourcevar.h> 47 #include <sys/sysent.h> 48 #include <sys/systm.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 #include <sys/inflate.h> 52 #include <sys/sysctl.h> 53 #include <sys/lock.h> 54 #include <sys/resident.h> 55 56 #include <vm/vm.h> 57 #include <vm/vm_param.h> 58 #include <vm/pmap.h> 59 #include <vm/vm_map.h> 60 #include <vm/vm_kern.h> 61 #include <vm/vm_extern.h> 62 63 static int exec_res_id = 0; 64 65 static TAILQ_HEAD(,vmresident) exec_res_list; 66 67 static MALLOC_DEFINE(M_EXEC_RES, "vmresident", "resident execs"); 68 69 /* lockmgr lock for protecting the exec_res_list */ 70 static struct lock exec_list_lock; 71 72 static void 73 vm_resident_init(void *__dummy) 74 { 75 lockinit(&exec_list_lock, 0, "vmres", 0, 0); 76 TAILQ_INIT(&exec_res_list); 77 } 78 SYSINIT(vmres, SI_SUB_VM, SI_ORDER_ANY, vm_resident_init, 0); 79 80 static int 81 fill_xresident(struct vmresident *vr, struct xresident *in, struct thread *td) 82 { 83 struct stat st; 84 struct vnode *vrtmp; 85 int error = 0; 86 87 vrtmp = vr->vr_vnode; 88 89 in->res_entry_addr = vr->vr_entry_addr; 90 in->res_id = vr->vr_id; 91 if (vrtmp) { 92 char *freepath, *fullpath; 93 error = vn_fullpath(td->td_proc, vrtmp, &fullpath, &freepath); 94 if (error != 0) { 95 /* could not retrieve cached path, return zero'ed string */ 96 bzero(in->res_file, MAXPATHLEN); 97 error = 0; 98 } else { 99 strlcpy(in->res_file, fullpath, sizeof(in->res_file)); 100 free(freepath, M_TEMP); 101 } 102 103 /* indicate that we are using the vnode */ 104 error = vget(vrtmp, LK_EXCLUSIVE, td); 105 if (error) 106 goto done; 107 108 /* retrieve underlying stat information and release vnode */ 109 error = vn_stat(vrtmp, &st, td); 110 vput(vrtmp); 111 if (error) 112 goto done; 113 114 in->res_stat = st; 115 } 116 117 done: 118 if (error) 119 printf("fill_xresident, error = %d\n", error); 120 return (error); 121 } 122 123 static int 124 sysctl_vm_resident(SYSCTL_HANDLER_ARGS) 125 { 126 struct vmresident *vmres; 127 struct thread *td; 128 int error; 129 int count; 130 131 /* only super-user should call this sysctl */ 132 td = req->td; 133 if ((suser(td)) != 0) 134 return EPERM; 135 136 error = count = 0; 137 138 if (exec_res_id == 0) 139 return error; 140 141 /* client queried for number of resident binaries */ 142 if (!req->oldptr) 143 return SYSCTL_OUT(req, 0, exec_res_id); 144 145 lockmgr(&exec_list_lock, LK_SHARED, NULL, td); 146 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) { 147 struct xresident xres; 148 error = fill_xresident(vmres, &xres, td); 149 if (error != 0) 150 break; 151 152 error = SYSCTL_OUT(req, (void *)&xres, 153 sizeof(struct xresident)); 154 if (error != 0) 155 break; 156 } 157 lockmgr(&exec_list_lock, LK_RELEASE, NULL, td); 158 159 return (error); 160 } 161 SYSCTL_PROC(_vm, OID_AUTO, resident, CTLTYPE_OPAQUE|CTLFLAG_RD, 0, 0, 162 sysctl_vm_resident, "S,xresident", "resident executables (sys/resident.h)"); 163 164 int 165 exec_resident_imgact(struct image_params *imgp) 166 { 167 struct vmresident *vmres; 168 169 /* 170 * resident image activator 171 */ 172 if ((vmres = imgp->vp->v_resident) == NULL) 173 return(-1); 174 exec_new_vmspace(imgp, vmres->vr_vmspace); 175 imgp->resident = 1; 176 imgp->interpreted = 0; 177 imgp->proc->p_sysent = vmres->vr_sysent; 178 imgp->entry_addr = vmres->vr_entry_addr; 179 return(0); 180 } 181 182 /* 183 * exec_sys_register(entry) 184 * 185 * Register ourselves for resident execution. Only root can do this. This 186 * will snapshot the vmspace and cause future exec's of the specified binary 187 * to use the snapshot directly rather then load & relocate a new copy. 188 */ 189 int 190 exec_sys_register(struct exec_sys_register_args *uap) 191 { 192 struct vmresident *vmres; 193 struct vnode *vp; 194 struct proc *p; 195 int error; 196 197 p = curproc; 198 if ((error = suser(p->p_thread)) != 0) 199 return(error); 200 if ((vp = p->p_textvp) == NULL) 201 return(ENOENT); 202 if (vp->v_resident) 203 return(EEXIST); 204 vhold(vp); 205 vmres = malloc(sizeof(*vmres), M_EXEC_RES, M_WAITOK); 206 vp->v_resident = vmres; 207 vmres->vr_vnode = vp; 208 vmres->vr_sysent = p->p_sysent; 209 vmres->vr_id = ++exec_res_id; 210 vmres->vr_entry_addr = (intptr_t)uap->entry; 211 vmres->vr_vmspace = vmspace_fork(p->p_vmspace); /* XXX order */ 212 213 lockmgr(&exec_list_lock, LK_EXCLUSIVE, NULL, curthread); 214 TAILQ_INSERT_TAIL(&exec_res_list, vmres, vr_link); 215 lockmgr(&exec_list_lock, LK_RELEASE, NULL, curthread); 216 217 return(0); 218 } 219 220 /* 221 * exec_sys_unregister(id) 222 * 223 * Unregister the specified id. If an id of -1 is used unregister 224 * the registration associated with the current process. An id of -2 225 * unregisters everything. 226 */ 227 int 228 exec_sys_unregister(struct exec_sys_unregister_args *uap) 229 { 230 struct vmresident *vmres; 231 struct proc *p; 232 int error; 233 int id; 234 int count; 235 236 p = curproc; 237 if ((error = suser(p->p_thread)) != 0) 238 return(error); 239 240 /* 241 * If id is -1, unregister ourselves 242 */ 243 if ((id = uap->id) == -1 && p->p_textvp && p->p_textvp->v_resident) 244 id = p->p_textvp->v_resident->vr_id; 245 246 /* 247 * Look for the registration 248 */ 249 error = ENOENT; 250 count = 0; 251 252 lockmgr(&exec_list_lock, LK_EXCLUSIVE, NULL, curthread); 253 restart: 254 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) { 255 if (id == -2 || vmres->vr_id == id) { 256 TAILQ_REMOVE(&exec_res_list, vmres, vr_link); 257 if (vmres->vr_vnode) { 258 vmres->vr_vnode->v_resident = NULL; 259 vdrop(vmres->vr_vnode); 260 vmres->vr_vnode = NULL; 261 } 262 if (vmres->vr_vmspace) { 263 vmspace_free(vmres->vr_vmspace); 264 vmres->vr_vmspace = NULL; 265 } 266 free(vmres, M_EXEC_RES); 267 exec_res_id--; 268 error = 0; 269 ++count; 270 goto restart; 271 } 272 } 273 lockmgr(&exec_list_lock, LK_RELEASE, NULL, curthread); 274 if (error == 0) 275 uap->sysmsg_result = count; 276 return(error); 277 } 278 279