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_DEFINE1(sysctl, handle_string, copyout_error, "int"); 79 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 80 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 81 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 82 83 #ifdef LINUX_LEGACY_SYSCALLS 84 static int 85 handle_string(struct l___sysctl_args *la, char *value) 86 { 87 int error; 88 89 if (la->oldval != 0) { 90 l_int len = strlen(value); 91 error = copyout(value, PTRIN(la->oldval), len + 1); 92 if (!error && la->oldlenp != 0) 93 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 94 if (error) { 95 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 96 error); 97 return (error); 98 } 99 } 100 101 if (la->newval != 0) 102 return (ENOTDIR); 103 104 return (0); 105 } 106 107 int 108 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 109 { 110 struct l___sysctl_args la; 111 struct sbuf *sb; 112 l_int *mib; 113 char *sysctl_string; 114 int error, i; 115 116 error = copyin(args->args, &la, sizeof(la)); 117 if (error) { 118 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 119 return (error); 120 } 121 122 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 123 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 124 LINUX_CTL_MAXNAME); 125 return (ENOTDIR); 126 } 127 128 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 129 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 130 if (error) { 131 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 132 free(mib, M_LINUX); 133 return (error); 134 } 135 136 switch (mib[0]) { 137 case LINUX_CTL_KERN: 138 if (la.nlen < 2) 139 break; 140 141 switch (mib[1]) { 142 case LINUX_KERN_VERSION: 143 error = handle_string(&la, version); 144 free(mib, M_LINUX); 145 return (error); 146 default: 147 break; 148 } 149 break; 150 default: 151 break; 152 } 153 154 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 155 if (sb == NULL) { 156 linux_msg(td, "sysctl is not implemented"); 157 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 158 "unknown sysctl, ENOMEM during lookup"); 159 } else { 160 sbuf_printf(sb, "sysctl "); 161 for (i = 0; i < la.nlen; i++) 162 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 163 sbuf_printf(sb, "} is not implemented"); 164 sbuf_finish(sb); 165 sysctl_string = sbuf_data(sb); 166 linux_msg(td, "%s", sysctl_string); 167 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 168 sysctl_string); 169 sbuf_delete(sb); 170 } 171 172 free(mib, M_LINUX); 173 174 return (ENOTDIR); 175 } 176 #endif 177