1 /* 2 * Copyright (c) 1996, 1997, 1998 3 * HD Associates, Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by HD Associates, Inc 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35 /* p1003_1b: Real Time common code. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/module.h> 43 #include <sys/mutex.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 #include <sys/sysent.h> 47 #include <sys/syslog.h> 48 #include <sys/sysproto.h> 49 50 #include <posix4/posix4.h> 51 52 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); 53 54 /* p31b_proc: Return a proc struct corresponding to a pid to operate on. 55 * 56 * Enforce permission policy. 57 * 58 * The policy is the same as for sending signals except there 59 * is no notion of process groups. 60 * 61 * pid == 0 means my process. 62 * 63 * This is disabled until I've got a permission gate in again: 64 * only root can do this. 65 */ 66 67 #if 0 68 /* 69 * This is stolen from CANSIGNAL in kern_sig: 70 * 71 * Can process with credential cr1 do "write flavor" operations to credential 72 * cr2. This check needs to use generalized checks. 73 */ 74 #define CAN_AFFECT(cr1, cr2) \ 75 (!suser_xxx(cr1, NULL, PRISON_ROOT) || \ 76 (c1)->cr_ruid == (cr2)->cr_ruid || \ 77 (c1)->cr_uid == (cr2)->cr_ruid || \ 78 (c1)->cr_ruid == (cr2)->cr_uid || \ 79 (c1)->cr_uid == (cr2)->cr_uid) 80 #else 81 #define CAN_AFFECT(cr1, cr2) (!suser_xxx(cr1, NULL, PRISON_ROOT)) 82 #endif 83 84 /* 85 * p31b_proc: Look up a proc from a PID. If proc is 0 it is 86 * my own proc. 87 */ 88 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) 89 { 90 int ret = 0; 91 struct proc *other_proc = 0; 92 93 if (pid == 0) { 94 other_proc = p; 95 PROC_LOCK(p); 96 } else 97 other_proc = pfind(pid); 98 99 if (other_proc) 100 { 101 /* Enforce permission policy. 102 */ 103 if (CAN_AFFECT(p->p_ucred, other_proc->p_ucred)) 104 *pp = other_proc; 105 else 106 ret = EPERM; 107 PROC_UNLOCK(other_proc); 108 } 109 else 110 ret = ESRCH; 111 112 return ret; 113 } 114 115 /* The system calls return ENOSYS if an entry is called that is 116 * not run-time supported. I am also logging since some programs 117 * start to use this when they shouldn't. That will be removed if annoying. 118 */ 119 int 120 syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap) 121 { 122 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 123 p->p_comm, p->p_pid, s); 124 125 /* a " return nosys(p, uap); " here causes a core dump. 126 */ 127 128 return ENOSYS; 129 } 130 131 #if !defined(_KPOSIX_PRIORITY_SCHEDULING) 132 133 /* Not configured but loadable via a module: 134 */ 135 136 static int sched_attach(void) 137 { 138 return 0; 139 } 140 141 SYSCALL_NOT_PRESENT_GEN(sched_setparam) 142 SYSCALL_NOT_PRESENT_GEN(sched_getparam) 143 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 144 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 145 SYSCALL_NOT_PRESENT_GEN(sched_yield) 146 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 147 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 148 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 149 150 #else 151 152 /* Configured in kernel version: 153 */ 154 static struct ksched *ksched; 155 156 static int sched_attach(void) 157 { 158 int ret = ksched_attach(&ksched); 159 160 if (ret == 0) 161 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 162 163 return ret; 164 } 165 166 int sched_setparam(struct proc *p, 167 struct sched_setparam_args *uap) 168 { 169 int e; 170 171 struct sched_param sched_param; 172 copyin(uap->param, &sched_param, sizeof(sched_param)); 173 174 (void) (0 175 || (e = p31b_proc(p, uap->pid, &p)) 176 || (e = ksched_setparam(&p->p_retval[0], ksched, p, 177 (const struct sched_param *)&sched_param)) 178 ); 179 180 return e; 181 } 182 183 int sched_getparam(struct proc *p, 184 struct sched_getparam_args *uap) 185 { 186 int e; 187 struct sched_param sched_param; 188 189 (void) (0 190 || (e = p31b_proc(p, uap->pid, &p)) 191 || (e = ksched_getparam(&p->p_retval[0], ksched, p, &sched_param)) 192 ); 193 194 if (!e) 195 copyout(&sched_param, uap->param, sizeof(sched_param)); 196 197 return e; 198 } 199 int sched_setscheduler(struct proc *p, 200 struct sched_setscheduler_args *uap) 201 { 202 int e; 203 204 struct sched_param sched_param; 205 copyin(uap->param, &sched_param, sizeof(sched_param)); 206 207 (void) (0 208 || (e = p31b_proc(p, uap->pid, &p)) 209 || (e = ksched_setscheduler(&p->p_retval[0], 210 ksched, p, uap->policy, 211 (const struct sched_param *)&sched_param)) 212 ); 213 214 return e; 215 } 216 int sched_getscheduler(struct proc *p, 217 struct sched_getscheduler_args *uap) 218 { 219 int e; 220 (void) (0 221 || (e = p31b_proc(p, uap->pid, &p)) 222 || (e = ksched_getscheduler(&p->p_retval[0], ksched, p)) 223 ); 224 225 return e; 226 } 227 int sched_yield(struct proc *p, 228 struct sched_yield_args *uap) 229 { 230 return ksched_yield(&p->p_retval[0], ksched); 231 } 232 int sched_get_priority_max(struct proc *p, 233 struct sched_get_priority_max_args *uap) 234 { 235 return ksched_get_priority_max(&p->p_retval[0], 236 ksched, uap->policy); 237 } 238 int sched_get_priority_min(struct proc *p, 239 struct sched_get_priority_min_args *uap) 240 { 241 return ksched_get_priority_min(&p->p_retval[0], 242 ksched, uap->policy); 243 } 244 int sched_rr_get_interval(struct proc *p, 245 struct sched_rr_get_interval_args *uap) 246 { 247 int e; 248 249 (void) (0 250 || (e = p31b_proc(p, uap->pid, &p)) 251 || (e = ksched_rr_get_interval(&p->p_retval[0], ksched, 252 p, uap->interval)) 253 ); 254 255 return e; 256 } 257 258 #endif 259 260 static void p31binit(void *notused) 261 { 262 (void) sched_attach(); 263 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 264 } 265 266 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 267