1/*- 2 * Copyright (c) 2001 Dag-Erling Co�dan Sm�rgrav 3 * 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 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31#include "opt_compat.h" 32 33#include <sys/param.h> 34#include <sys/lock.h> 35#include <sys/mutex.h> 36#include <sys/pioctl.h> 37#include <sys/priv.h> 38#include <sys/proc.h> 39#include <sys/signalvar.h> 40#include <sys/systm.h> 41 42#include <fs/pseudofs/pseudofs.h> 43#include <fs/procfs/procfs.h> 44 45#ifdef COMPAT_FREEBSD32 46struct procfs_status32 { 47 int state; /* Running, stopped, something else? */ 48 int flags; /* Any flags */ 49 unsigned int events; /* Events to stop on */ 50 int why; /* What event, if any, proc stopped on */ 51 unsigned int val; /* Any extra data */ 52}; 53 54#define PIOCWAIT32 _IOR('p', 4, struct procfs_status32) 55#define PIOCSTATUS32 _IOR('p', 6, struct procfs_status32) 56#endif 57 58/* 59 * Process ioctls 60 */ 61int 62procfs_ioctl(PFS_IOCTL_ARGS) 63{ 64 struct procfs_status *ps; 65#ifdef COMPAT_FREEBSD32 66 struct procfs_status32 *ps32; 67#endif 68 int error, flags, sig; 69#ifdef COMPAT_FREEBSD6 70 int ival; 71#endif 72 73 KASSERT(p != NULL, 74 ("%s() called without a process", __func__)); 75 PROC_LOCK_ASSERT(p, MA_OWNED); 76 77 error = 0; 78 switch (cmd) { 79#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 80 case _IOC(IOC_IN, 'p', 1, 0): 81#endif 82#ifdef COMPAT_FREEBSD6 83 case _IO('p', 1): 84 ival = IOCPARM_IVAL(data); 85 data = &ival; 86#endif 87 case PIOCBIS: 88 p->p_stops |= *(unsigned int *)data; 89 break; 90#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 91 case _IOC(IOC_IN, 'p', 2, 0): 92#endif 93#ifdef COMPAT_FREEBSD6 94 case _IO('p', 2): 95 ival = IOCPARM_IVAL(data); 96 data = &ival; 97#endif 98 case PIOCBIC: 99 p->p_stops &= ~*(unsigned int *)data; 100 break; 101#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 102 case _IOC(IOC_IN, 'p', 3, 0): 103#endif 104#ifdef COMPAT_FREEBSD6 105 case _IO('p', 3): 106 ival = IOCPARM_IVAL(data); 107 data = &ival; 108#endif 109 case PIOCSFL: 110 flags = *(unsigned int *)data; 111 if (flags & PF_ISUGID) { 112 /* 113 * XXXRW: Is this specific check required here, as 114 * p_candebug() should implement it, or other checks 115 * are missing. 116 */ 117 error = priv_check(td, PRIV_DEBUG_SUGID); 118 if (error) 119 break; 120 } 121 p->p_pfsflags = flags; 122 break; 123 case PIOCGFL: 124 *(unsigned int *)data = p->p_pfsflags; 125 break; 126 case PIOCWAIT: 127 while (p->p_step == 0 && (p->p_flag & P_WEXIT) == 0) { 128 /* sleep until p stops */ 129 _PHOLD(p); 130 error = msleep(&p->p_stype, &p->p_mtx, 131 PWAIT|PCATCH, "pioctl", 0); 132 _PRELE(p); 133 if (error != 0) 134 break; 135 } 136 /* fall through to PIOCSTATUS */ 137 case PIOCSTATUS: 138 ps = (struct procfs_status *)data; 139 ps->state = (p->p_step == 0); 140 ps->flags = 0; /* nope */ 141 ps->events = p->p_stops; 142 ps->why = p->p_step ? p->p_stype : 0; 143 ps->val = p->p_step ? p->p_xstat : 0; 144 break; 145#ifdef COMPAT_FREEBSD32 146 case PIOCWAIT32: 147 while (p->p_step == 0 && (p->p_flag & P_WEXIT) == 0) { 148 /* sleep until p stops */ 149 _PHOLD(p); 150 error = msleep(&p->p_stype, &p->p_mtx, 151 PWAIT|PCATCH, "pioctl", 0); 152 _PRELE(p); 153 if (error != 0) 154 break; 155 } 156 /* fall through to PIOCSTATUS32 */ 157 case PIOCSTATUS32: 158 ps32 = (struct procfs_status32 *)data; 159 ps32->state = (p->p_step == 0); 160 ps32->flags = 0; /* nope */ 161 ps32->events = p->p_stops; 162 ps32->why = p->p_step ? p->p_stype : 0; 163 ps32->val = p->p_step ? p->p_xstat : 0; 164 break; 165#endif 166#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 167 case _IOC(IOC_IN, 'p', 5, 0): 168#endif 169#ifdef COMPAT_FREEBSD6 170 case _IO('p', 5): 171 ival = IOCPARM_IVAL(data); 172 data = &ival; 173#endif 174 case PIOCCONT: 175 if (p->p_step == 0) 176 break; 177 sig = *(unsigned int *)data; 178 if (sig != 0 && !_SIG_VALID(sig)) { 179 error = EINVAL; 180 break; 181 } 182#if 0 183 p->p_step = 0; 184 if (P_SHOULDSTOP(p)) { 185 p->p_xstat = sig; 186 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG); 187 PROC_SLOCK(p); 188 thread_unsuspend(p); 189 PROC_SUNLOCK(p); 190 } else if (sig) 191 kern_psignal(p, sig); 192#else 193 if (sig) 194 kern_psignal(p, sig); 195 p->p_step = 0; 196 wakeup(&p->p_step); 197#endif 198 break; 199 default: 200 error = (ENOTTY); 201 } 202 203 return (error); 204} 205 206/* 207 * Clean up on last close 208 */ 209int 210procfs_close(PFS_CLOSE_ARGS) 211{ 212 if (p != NULL && (p->p_pfsflags & PF_LINGER) == 0) { 213 PROC_LOCK_ASSERT(p, MA_OWNED); 214 p->p_pfsflags = 0; 215 p->p_stops = 0; 216 p->p_step = 0; 217 wakeup(&p->p_step); 218 } 219 return (0); 220} 221