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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 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 45 /* 46 * Limit projlist to 256k projects. 47 */ 48 #define MAX_PROJLIST_BUFSIZE 1048576 49 50 typedef struct projlist_walk { 51 projid_t *pw_buf; 52 size_t pw_bufsz; 53 } projlist_walk_t; 54 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, getzoneid(), 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); 115 116 if (kpj->kpj_nlwps + p->p_lwpcnt > kpj->kpj_nlwps_ctl) 117 if (rctl_test_entity(rc_project_nlwps, kpj->kpj_rctls, p, &e, 118 p->p_lwpcnt, 0) & RCT_DENY) 119 rctlfail = 1; 120 121 if (kpj->kpj_ntasks + 1 > kpj->kpj_ntasks_ctl) 122 if (rctl_test_entity(rc_project_ntasks, kpj->kpj_rctls, p, &e, 123 1, 0) & RCT_DENY) 124 rctlfail = 1; 125 126 if (rctlfail) { 127 mutex_exit(&zone->zone_nlwps_lock); 128 if (curthread != p->p_agenttp) 129 continuelwps(p); 130 mutex_exit(&p->p_lock); 131 return (set_errno(EAGAIN)); 132 } 133 kpj->kpj_nlwps += p->p_lwpcnt; 134 kpj->kpj_ntasks++; 135 136 oldpj->kpj_nlwps -= p->p_lwpcnt; 137 138 mutex_exit(&zone->zone_nlwps_lock); 139 mutex_exit(&p->p_lock); 140 141 mutex_enter(&kpj->kpj_poolbind); 142 tk = task_create(projid, curproc->p_zone); 143 mutex_enter(&cpu_lock); 144 /* 145 * Returns with p_lock held. 146 */ 147 oldtk = task_join(tk, flags); 148 if (curthread != p->p_agenttp) 149 continuelwps(p); 150 mutex_exit(&p->p_lock); 151 mutex_exit(&cpu_lock); 152 mutex_exit(&kpj->kpj_poolbind); 153 task_rele(oldtk); 154 project_rele(kpj); 155 return (tk->tk_tkid); 156 } 157 158 /* 159 * taskid_t tasksys_gettaskid(void); 160 * 161 * Overview 162 * Return the current task ID for this process. 163 * 164 * Return value 165 * The ID for the task to which the current process belongs. 166 */ 167 static long 168 tasksys_gettaskid() 169 { 170 long ret; 171 proc_t *p = ttoproc(curthread); 172 173 mutex_enter(&pidlock); 174 ret = p->p_task->tk_tkid; 175 mutex_exit(&pidlock); 176 return (ret); 177 } 178 179 /* 180 * projid_t tasksys_getprojid(void); 181 * 182 * Overview 183 * Return the current project ID for this process. 184 * 185 * Return value 186 * The ID for the project to which the current process belongs. 187 */ 188 static long 189 tasksys_getprojid() 190 { 191 long ret; 192 proc_t *p = ttoproc(curthread); 193 194 mutex_enter(&pidlock); 195 ret = p->p_task->tk_proj->kpj_id; 196 mutex_exit(&pidlock); 197 return (ret); 198 } 199 200 static int 201 tasksys_projlist_cb(kproject_t *kp, void *buf) 202 { 203 projlist_walk_t *pw = (projlist_walk_t *)buf; 204 205 if (pw && pw->pw_bufsz >= sizeof (projid_t)) { 206 *pw->pw_buf = kp->kpj_id; 207 pw->pw_buf++; 208 pw->pw_bufsz -= sizeof (projid_t); 209 } 210 211 return (0); 212 } 213 214 /* 215 * long tasksys_projlist(void *buf, size_t bufsz) 216 * 217 * Overview 218 * Return a buffer containing the project IDs of all currently active projects 219 * in the current zone. 220 * 221 * Return values 222 * The minimum size of a buffer sufficiently large to contain all of the 223 * active project IDs, or -1 if an error occurs during copyout. 224 */ 225 static long 226 tasksys_projlist(void *buf, size_t bufsz) 227 { 228 long ret = 0; 229 projlist_walk_t pw; 230 void *kbuf; 231 232 if (buf == NULL || bufsz == 0) 233 return (project_walk_all(getzoneid(), tasksys_projlist_cb, 234 NULL)); 235 236 if (bufsz > MAX_PROJLIST_BUFSIZE) 237 return (set_errno(ENOMEM)); 238 239 kbuf = pw.pw_buf = kmem_zalloc(bufsz, KM_SLEEP); 240 pw.pw_bufsz = bufsz; 241 242 ret = project_walk_all(getzoneid(), tasksys_projlist_cb, &pw); 243 244 if (copyout(kbuf, buf, bufsz) == -1) 245 ret = set_errno(EFAULT); 246 247 kmem_free(kbuf, bufsz); 248 return (ret); 249 } 250 251 long 252 tasksys(int code, projid_t projid, uint_t flags, void *projidbuf, size_t pbufsz) 253 { 254 switch (code) { 255 case 0: 256 return (tasksys_settaskid(projid, flags)); 257 case 1: 258 return (tasksys_gettaskid()); 259 case 2: 260 return (tasksys_getprojid()); 261 case 3: 262 return (tasksys_projlist(projidbuf, pbufsz)); 263 default: 264 return (set_errno(EINVAL)); 265 } 266 } 267