1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 29 /* 30 * System calls for creating and inquiring about tasks and projects 31 */ 32 33 #include <sys/param.h> 34 #include <sys/types.h> 35 #include <sys/errno.h> 36 #include <sys/thread.h> 37 #include <sys/proc.h> 38 #include <sys/task.h> 39 #include <sys/systm.h> 40 #include <sys/project.h> 41 #include <sys/cpuvar.h> 42 #include <sys/policy.h> 43 #include <sys/zone.h> 44 #include <sys/rctl.h> 45 46 /* 47 * Limit projlist to 256k projects. 48 */ 49 #define MAX_PROJLIST_BUFSIZE 1048576 50 51 typedef struct projlist_walk { 52 projid_t *pw_buf; 53 size_t pw_bufsz; 54 } projlist_walk_t; 55 56 /* 57 * taskid_t tasksys_settaskid(projid_t projid, uint_t flags); 58 * 59 * Overview 60 * Place the calling process in a new task if sufficiently privileged. If the 61 * present task is finalized, the process may not create a new task. 62 * 63 * Return values 64 * 0 on success, errno on failure. 65 */ 66 static long 67 tasksys_settaskid(projid_t projid, uint_t flags) 68 { 69 proc_t *p = ttoproc(curthread); 70 kproject_t *oldpj; 71 kproject_t *kpj; 72 task_t *tk, *oldtk; 73 rctl_entity_p_t e; 74 zone_t *zone; 75 int rctlfail = 0; 76 77 if (secpolicy_tasksys(CRED()) != 0) 78 return (set_errno(EPERM)); 79 80 if (projid < 0 || projid > MAXPROJID) 81 return (set_errno(EINVAL)); 82 83 if (flags & ~TASK_FINAL) 84 return (set_errno(EINVAL)); 85 86 mutex_enter(&pidlock); 87 if (p->p_task->tk_flags & TASK_FINAL) { 88 mutex_exit(&pidlock); 89 return (set_errno(EACCES)); 90 } 91 mutex_exit(&pidlock); 92 93 /* 94 * Try to stop all other lwps in the process while we're changing 95 * our project. This way, curthread doesn't need to grab its own 96 * thread_lock to find its project ID (see curprojid()). If this 97 * is the /proc agent lwp, we know that the other lwps are already 98 * held. If we failed to hold all lwps, bail out and return EINTR. 99 */ 100 if (curthread != p->p_agenttp && !holdlwps(SHOLDFORK1)) 101 return (set_errno(EINTR)); 102 /* 103 * Put a hold on our new project and make sure that nobody is 104 * trying to bind it to a pool while we're joining. 105 */ 106 kpj = project_hold_by_id(projid, p->p_zone, PROJECT_HOLD_INSERT); 107 e.rcep_p.proj = kpj; 108 e.rcep_t = RCENTITY_PROJECT; 109 110 mutex_enter(&p->p_lock); 111 oldpj = p->p_task->tk_proj; 112 zone = p->p_zone; 113 114 mutex_enter(&zone->zone_nlwps_lock); 115 mutex_enter(&zone->zone_mem_lock); 116 117 if (kpj->kpj_nlwps + p->p_lwpcnt > kpj->kpj_nlwps_ctl) 118 if (rctl_test_entity(rc_project_nlwps, kpj->kpj_rctls, p, &e, 119 p->p_lwpcnt, 0) & RCT_DENY) 120 rctlfail = 1; 121 122 if (kpj->kpj_ntasks + 1 > kpj->kpj_ntasks_ctl) 123 if (rctl_test_entity(rc_project_ntasks, kpj->kpj_rctls, p, &e, 124 1, 0) & RCT_DENY) 125 rctlfail = 1; 126 127 if (kpj->kpj_data.kpd_locked_mem + p->p_locked_mem 128 > kpj->kpj_data.kpd_locked_mem_ctl) 129 if (rctl_test_entity(rc_project_locked_mem, kpj->kpj_rctls, p, 130 &e, p->p_locked_mem, 0) &RCT_DENY) 131 rctlfail = 1; 132 133 if (rctlfail) { 134 mutex_exit(&zone->zone_mem_lock); 135 mutex_exit(&zone->zone_nlwps_lock); 136 if (curthread != p->p_agenttp) 137 continuelwps(p); 138 mutex_exit(&p->p_lock); 139 return (set_errno(EAGAIN)); 140 } 141 kpj->kpj_data.kpd_locked_mem += p->p_locked_mem; 142 kpj->kpj_nlwps += p->p_lwpcnt; 143 kpj->kpj_ntasks++; 144 145 oldpj->kpj_data.kpd_locked_mem -= p->p_locked_mem; 146 oldpj->kpj_nlwps -= p->p_lwpcnt; 147 148 mutex_exit(&zone->zone_mem_lock); 149 mutex_exit(&zone->zone_nlwps_lock); 150 mutex_exit(&p->p_lock); 151 152 mutex_enter(&kpj->kpj_poolbind); 153 tk = task_create(projid, curproc->p_zone); 154 mutex_enter(&cpu_lock); 155 /* 156 * Returns with p_lock held. 157 */ 158 oldtk = task_join(tk, flags); 159 if (curthread != p->p_agenttp) 160 continuelwps(p); 161 mutex_exit(&p->p_lock); 162 mutex_exit(&cpu_lock); 163 mutex_exit(&kpj->kpj_poolbind); 164 task_rele(oldtk); 165 project_rele(kpj); 166 return (tk->tk_tkid); 167 } 168 169 /* 170 * taskid_t tasksys_gettaskid(void); 171 * 172 * Overview 173 * Return the current task ID for this process. 174 * 175 * Return value 176 * The ID for the task to which the current process belongs. 177 */ 178 static long 179 tasksys_gettaskid() 180 { 181 long ret; 182 proc_t *p = ttoproc(curthread); 183 184 mutex_enter(&pidlock); 185 ret = p->p_task->tk_tkid; 186 mutex_exit(&pidlock); 187 return (ret); 188 } 189 190 /* 191 * projid_t tasksys_getprojid(void); 192 * 193 * Overview 194 * Return the current project ID for this process. 195 * 196 * Return value 197 * The ID for the project to which the current process belongs. 198 */ 199 static long 200 tasksys_getprojid() 201 { 202 long ret; 203 proc_t *p = ttoproc(curthread); 204 205 mutex_enter(&pidlock); 206 ret = p->p_task->tk_proj->kpj_id; 207 mutex_exit(&pidlock); 208 return (ret); 209 } 210 211 static int 212 tasksys_projlist_cb(kproject_t *kp, void *buf) 213 { 214 projlist_walk_t *pw = (projlist_walk_t *)buf; 215 216 if (pw && pw->pw_bufsz >= sizeof (projid_t)) { 217 *pw->pw_buf = kp->kpj_id; 218 pw->pw_buf++; 219 pw->pw_bufsz -= sizeof (projid_t); 220 } 221 222 return (0); 223 } 224 225 /* 226 * long tasksys_projlist(void *buf, size_t bufsz) 227 * 228 * Overview 229 * Return a buffer containing the project IDs of all currently active projects 230 * in the current zone. 231 * 232 * Return values 233 * The minimum size of a buffer sufficiently large to contain all of the 234 * active project IDs, or -1 if an error occurs during copyout. 235 */ 236 static long 237 tasksys_projlist(void *buf, size_t bufsz) 238 { 239 long ret = 0; 240 projlist_walk_t pw; 241 void *kbuf; 242 243 if (buf == NULL || bufsz == 0) 244 return (project_walk_all(getzoneid(), tasksys_projlist_cb, 245 NULL)); 246 247 if (bufsz > MAX_PROJLIST_BUFSIZE) 248 return (set_errno(ENOMEM)); 249 250 kbuf = pw.pw_buf = kmem_zalloc(bufsz, KM_SLEEP); 251 pw.pw_bufsz = bufsz; 252 253 ret = project_walk_all(getzoneid(), tasksys_projlist_cb, &pw); 254 255 if (copyout(kbuf, buf, bufsz) == -1) 256 ret = set_errno(EFAULT); 257 258 kmem_free(kbuf, bufsz); 259 return (ret); 260 } 261 262 long 263 tasksys(int code, projid_t projid, uint_t flags, void *projidbuf, size_t pbufsz) 264 { 265 switch (code) { 266 case 0: 267 return (tasksys_settaskid(projid, flags)); 268 case 1: 269 return (tasksys_gettaskid()); 270 case 2: 271 return (tasksys_getprojid()); 272 case 3: 273 return (tasksys_projlist(projidbuf, pbufsz)); 274 default: 275 return (set_errno(EINVAL)); 276 } 277 } 278