1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/mutex.h> 39 #include <sys/proc.h> 40 #include <sys/sdt.h> 41 #include <sys/sysctl.h> 42 #include <sys/systm.h> 43 #include <sys/sbuf.h> 44 45 #ifdef COMPAT_LINUX32 46 #include <machine/../linux32/linux.h> 47 #include <machine/../linux32/linux32_proto.h> 48 #else 49 #include <machine/../linux/linux.h> 50 #include <machine/../linux/linux_proto.h> 51 #endif 52 53 #include <compat/linux/linux_dtrace.h> 54 #include <compat/linux/linux_misc.h> 55 #include <compat/linux/linux_util.h> 56 57 #define LINUX_CTL_KERN 1 58 #define LINUX_CTL_VM 2 59 #define LINUX_CTL_NET 3 60 #define LINUX_CTL_PROC 4 61 #define LINUX_CTL_FS 5 62 #define LINUX_CTL_DEBUG 6 63 #define LINUX_CTL_DEV 7 64 #define LINUX_CTL_BUS 8 65 66 /* CTL_KERN names */ 67 #define LINUX_KERN_OSTYPE 1 68 #define LINUX_KERN_OSRELEASE 2 69 #define LINUX_KERN_OSREV 3 70 #define LINUX_KERN_VERSION 4 71 72 /* DTrace init */ 73 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 74 75 /** 76 * DTrace probes in this module. 77 */ 78 LIN_SDT_PROBE_DEFINE2(sysctl, handle_string, entry, "struct l___sysctl_args *", 79 "char *"); 80 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int"); 81 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, return, "int"); 82 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, entry, "struct l___sysctl_args *", 83 "struct thread *"); 84 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 85 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 86 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 87 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, return, "int"); 88 89 #ifdef LINUX_LEGACY_SYSCALLS 90 static int 91 handle_string(struct l___sysctl_args *la, char *value) 92 { 93 int error; 94 95 LIN_SDT_PROBE2(sysctl, handle_string, entry, la, value); 96 97 if (la->oldval != 0) { 98 l_int len = strlen(value); 99 error = copyout(value, PTRIN(la->oldval), len + 1); 100 if (!error && la->oldlenp != 0) 101 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 102 if (error) { 103 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 104 error); 105 LIN_SDT_PROBE1(sysctl, handle_string, return, error); 106 return (error); 107 } 108 } 109 110 if (la->newval != 0) { 111 LIN_SDT_PROBE1(sysctl, handle_string, return, ENOTDIR); 112 return (ENOTDIR); 113 } 114 115 LIN_SDT_PROBE1(sysctl, handle_string, return, 0); 116 return (0); 117 } 118 119 int 120 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 121 { 122 struct l___sysctl_args la; 123 struct sbuf *sb; 124 l_int *mib; 125 char *sysctl_string; 126 int error, i; 127 128 LIN_SDT_PROBE2(sysctl, linux_sysctl, entry, td, args->args); 129 130 error = copyin(args->args, &la, sizeof(la)); 131 if (error) { 132 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 133 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 134 return (error); 135 } 136 137 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 138 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 139 LINUX_CTL_MAXNAME); 140 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR); 141 return (ENOTDIR); 142 } 143 144 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 145 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 146 if (error) { 147 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 148 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 149 free(mib, M_LINUX); 150 return (error); 151 } 152 153 switch (mib[0]) { 154 case LINUX_CTL_KERN: 155 if (la.nlen < 2) 156 break; 157 158 switch (mib[1]) { 159 case LINUX_KERN_VERSION: 160 error = handle_string(&la, version); 161 free(mib, M_LINUX); 162 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error); 163 return (error); 164 default: 165 break; 166 } 167 break; 168 default: 169 break; 170 } 171 172 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 173 if (sb == NULL) { 174 linux_msg(td, "sysctl is not implemented"); 175 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 176 "unknown sysctl, ENOMEM during lookup"); 177 } else { 178 sbuf_printf(sb, "sysctl "); 179 for (i = 0; i < la.nlen; i++) 180 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 181 sbuf_printf(sb, "} is not implemented"); 182 sbuf_finish(sb); 183 sysctl_string = sbuf_data(sb); 184 linux_msg(td, "%s", sbuf_data(sb)); 185 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 186 sysctl_string); 187 sbuf_delete(sb); 188 } 189 190 free(mib, M_LINUX); 191 192 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR); 193 return (ENOTDIR); 194 } 195 #endif 196