1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001 Marcel Moolenaar 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_compat.h" 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/mutex.h> 41 #include <sys/proc.h> 42 #include <sys/sdt.h> 43 #include <sys/sysctl.h> 44 #include <sys/systm.h> 45 #include <sys/sbuf.h> 46 47 #ifdef COMPAT_LINUX32 48 #include <machine/../linux32/linux.h> 49 #include <machine/../linux32/linux32_proto.h> 50 #else 51 #include <machine/../linux/linux.h> 52 #include <machine/../linux/linux_proto.h> 53 #endif 54 55 #include <compat/linux/linux_dtrace.h> 56 #include <compat/linux/linux_misc.h> 57 #include <compat/linux/linux_util.h> 58 59 #define LINUX_CTL_KERN 1 60 #define LINUX_CTL_VM 2 61 #define LINUX_CTL_NET 3 62 #define LINUX_CTL_PROC 4 63 #define LINUX_CTL_FS 5 64 #define LINUX_CTL_DEBUG 6 65 #define LINUX_CTL_DEV 7 66 #define LINUX_CTL_BUS 8 67 68 /* CTL_KERN names */ 69 #define LINUX_KERN_OSTYPE 1 70 #define LINUX_KERN_OSRELEASE 2 71 #define LINUX_KERN_OSREV 3 72 #define LINUX_KERN_VERSION 4 73 74 /* DTrace init */ 75 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 76 77 /** 78 * DTrace probes in this module. 79 */ 80 LIN_SDT_PROBE_DEFINE2(sysctl, handle_string, entry, "struct l___sysctl_args *", 81 "char *"); 82 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int"); 83 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, return, "int"); 84 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, entry, "struct l___sysctl_args *", 85 "struct thread *"); 86 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 87 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 88 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 89 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, return, "int"); 90 91 static int 92 handle_string(struct l___sysctl_args *la, char *value) 93 { 94 int error; 95 96 LIN_SDT_PROBE2(sysctl, handle_string, entry, la, value); 97 98 if (la->oldval != 0) { 99 l_int len = strlen(value); 100 error = copyout(value, PTRIN(la->oldval), len + 1); 101 if (!error && la->oldlenp != 0) 102 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 103 if (error) { 104 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 105 error); 106 LIN_SDT_PROBE1(sysctl, handle_string, return, error); 107 return (error); 108 } 109 } 110 111 if (la->newval != 0) { 112 LIN_SDT_PROBE1(sysctl, handle_string, return, ENOTDIR); 113 return (ENOTDIR); 114 } 115 116 LIN_SDT_PROBE1(sysctl, handle_string, return, 0); 117 return (0); 118 } 119 120 int 121 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 122 { 123 struct l___sysctl_args la; 124 struct sbuf *sb; 125 l_int *mib; 126 char *sysctl_string; 127 int error, i; 128 129 LIN_SDT_PROBE2(sysctl, linux_sysctl, entry, td, args->args); 130 131 error = copyin(args->args, &la, sizeof(la)); 132 if (error) { 133 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 134 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 135 return (error); 136 } 137 138 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 139 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 140 LINUX_CTL_MAXNAME); 141 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR); 142 return (ENOTDIR); 143 } 144 145 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 146 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 147 if (error) { 148 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 149 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 150 free(mib, M_LINUX); 151 return (error); 152 } 153 154 switch (mib[0]) { 155 case LINUX_CTL_KERN: 156 if (la.nlen < 2) 157 break; 158 159 switch (mib[1]) { 160 case LINUX_KERN_VERSION: 161 error = handle_string(&la, version); 162 free(mib, M_LINUX); 163 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 164 return (error); 165 default: 166 break; 167 } 168 break; 169 default: 170 break; 171 } 172 173 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 174 if (sb == NULL) { 175 linux_msg(td, "sysctl is not implemented"); 176 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 177 "unknown sysctl, ENOMEM during lookup"); 178 } else { 179 sbuf_printf(sb, "sysctl "); 180 for (i = 0; i < la.nlen; i++) 181 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 182 sbuf_printf(sb, "} is not implemented"); 183 sbuf_finish(sb); 184 sysctl_string = sbuf_data(sb); 185 linux_msg(td, "%s", sbuf_data(sb)); 186 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 187 sysctl_string); 188 sbuf_delete(sb); 189 } 190 191 free(mib, M_LINUX); 192 193 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR); 194 return (ENOTDIR); 195 } 196