procfs_ioctl.c revision 164033
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: head/sys/fs/procfs/procfs_ioctl.c 164033 2006-11-06 13:42:10Z rwatson $ 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_IA32 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_IA32 66 struct procfs_status32 *ps32; 67#endif 68 int error, flags, sig; 69#ifdef COMPAT_FREEBSD6 70 int ival; 71#endif 72 73 PROC_LOCK(p); 74 error = 0; 75 switch (cmd) { 76#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 77 case _IOC(IOC_IN, 'p', 1, 0): 78#endif 79#ifdef COMPAT_FREEBSD6 80 case _IO('p', 1): 81 ival = IOCPARM_IVAL(data); 82 data = &ival; 83#endif 84 case PIOCBIS: 85 p->p_stops |= *(unsigned int *)data; 86 break; 87#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 88 case _IOC(IOC_IN, 'p', 2, 0): 89#endif 90#ifdef COMPAT_FREEBSD6 91 case _IO('p', 2): 92 ival = IOCPARM_IVAL(data); 93 data = &ival; 94#endif 95 case PIOCBIC: 96 p->p_stops &= ~*(unsigned int *)data; 97 break; 98#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 99 case _IOC(IOC_IN, 'p', 3, 0): 100#endif 101#ifdef COMPAT_FREEBSD6 102 case _IO('p', 3): 103 ival = IOCPARM_IVAL(data); 104 data = &ival; 105#endif 106 case PIOCSFL: 107 flags = *(unsigned int *)data; 108 if (flags & PF_ISUGID) { 109 /* 110 * XXXRW: Is this specific check required here, as 111 * p_candebug() should implement it, or other checks 112 * are missing. 113 * 114 * XXXRW: Other debugging privileges are granted in 115 * jail, why isn't this? 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) { 128 /* sleep until p stops */ 129 error = msleep(&p->p_stype, &p->p_mtx, 130 PWAIT|PCATCH, "pioctl", 0); 131 if (error != 0) 132 break; 133 } 134 /* fall through to PIOCSTATUS */ 135 case PIOCSTATUS: 136 ps = (struct procfs_status *)data; 137 ps->state = (p->p_step == 0); 138 ps->flags = 0; /* nope */ 139 ps->events = p->p_stops; 140 ps->why = p->p_step ? p->p_stype : 0; 141 ps->val = p->p_step ? p->p_xstat : 0; 142 break; 143#ifdef COMPAT_IA32 144 case PIOCWAIT32: 145 while (p->p_step == 0) { 146 /* sleep until p stops */ 147 error = msleep(&p->p_stype, &p->p_mtx, 148 PWAIT|PCATCH, "pioctl", 0); 149 if (error != 0) 150 break; 151 } 152 /* fall through to PIOCSTATUS32 */ 153 case PIOCSTATUS32: 154 ps32 = (struct procfs_status32 *)data; 155 ps32->state = (p->p_step == 0); 156 ps32->flags = 0; /* nope */ 157 ps32->events = p->p_stops; 158 ps32->why = p->p_step ? p->p_stype : 0; 159 ps32->val = p->p_step ? p->p_xstat : 0; 160 break; 161#endif 162#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 163 case _IOC(IOC_IN, 'p', 5, 0): 164#endif 165#ifdef COMPAT_FREEBSD6 166 case _IO('p', 5): 167 ival = IOCPARM_IVAL(data); 168 data = &ival; 169#endif 170 case PIOCCONT: 171 if (p->p_step == 0) 172 break; 173 sig = *(unsigned int *)data; 174 if (sig != 0 && !_SIG_VALID(sig)) { 175 error = EINVAL; 176 break; 177 } 178#if 0 179 p->p_step = 0; 180 if (P_SHOULDSTOP(p)) { 181 p->p_xstat = sig; 182 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG); 183 mtx_lock_spin(&sched_lock); 184 thread_unsuspend(p); 185 mtx_unlock_spin(&sched_lock); 186 } else if (sig) 187 psignal(p, sig); 188#else 189 if (sig) 190 psignal(p, sig); 191 p->p_step = 0; 192 wakeup(&p->p_step); 193#endif 194 break; 195 default: 196 error = (ENOTTY); 197 } 198 PROC_UNLOCK(p); 199 200 return (error); 201} 202 203/* 204 * Clean up on last close 205 */ 206int 207procfs_close(PFS_CLOSE_ARGS) 208{ 209 if (p != NULL && (p->p_pfsflags & PF_LINGER) == 0) { 210 PROC_LOCK_ASSERT(p, MA_OWNED); 211 p->p_pfsflags = 0; 212 p->p_stops = 0; 213 p->p_step = 0; 214 wakeup(&p->p_step); 215 } 216 return (0); 217} 218