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 <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/mutex.h> 37 #include <sys/proc.h> 38 #include <sys/sdt.h> 39 #include <sys/sysctl.h> 40 #include <sys/systm.h> 41 #include <sys/sbuf.h> 42 43 #ifdef COMPAT_LINUX32 44 #include <machine/../linux32/linux.h> 45 #include <machine/../linux32/linux32_proto.h> 46 #else 47 #include <machine/../linux/linux.h> 48 #include <machine/../linux/linux_proto.h> 49 #endif 50 51 #include <compat/linux/linux_dtrace.h> 52 #include <compat/linux/linux_misc.h> 53 #include <compat/linux/linux_util.h> 54 55 #define LINUX_CTL_KERN 1 56 #define LINUX_CTL_VM 2 57 #define LINUX_CTL_NET 3 58 #define LINUX_CTL_PROC 4 59 #define LINUX_CTL_FS 5 60 #define LINUX_CTL_DEBUG 6 61 #define LINUX_CTL_DEV 7 62 #define LINUX_CTL_BUS 8 63 64 /* CTL_KERN names */ 65 #define LINUX_KERN_OSTYPE 1 66 #define LINUX_KERN_OSRELEASE 2 67 #define LINUX_KERN_OSREV 3 68 #define LINUX_KERN_VERSION 4 69 70 /* DTrace init */ 71 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 72 73 /** 74 * DTrace probes in this module. 75 */ 76 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int"); 77 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 78 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 79 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 80 81 #ifdef LINUX_LEGACY_SYSCALLS 82 static int 83 handle_string(struct l___sysctl_args *la, char *value) 84 { 85 int error; 86 87 if (la->oldval != 0) { 88 l_int len = strlen(value); 89 error = copyout(value, PTRIN(la->oldval), len + 1); 90 if (!error && la->oldlenp != 0) 91 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 92 if (error) { 93 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 94 error); 95 return (error); 96 } 97 } 98 99 if (la->newval != 0) 100 return (ENOTDIR); 101 102 return (0); 103 } 104 105 int 106 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 107 { 108 struct l___sysctl_args la; 109 struct sbuf *sb; 110 l_int *mib; 111 char *sysctl_string; 112 int error, i; 113 114 error = copyin(args->args, &la, sizeof(la)); 115 if (error) { 116 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 117 return (error); 118 } 119 120 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 121 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 122 LINUX_CTL_MAXNAME); 123 return (ENOTDIR); 124 } 125 126 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 127 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 128 if (error) { 129 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 130 free(mib, M_LINUX); 131 return (error); 132 } 133 134 switch (mib[0]) { 135 case LINUX_CTL_KERN: 136 if (la.nlen < 2) 137 break; 138 139 switch (mib[1]) { 140 case LINUX_KERN_VERSION: 141 error = handle_string(&la, version); 142 free(mib, M_LINUX); 143 return (error); 144 default: 145 break; 146 } 147 break; 148 default: 149 break; 150 } 151 152 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 153 if (sb == NULL) { 154 linux_msg(td, "sysctl is not implemented"); 155 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 156 "unknown sysctl, ENOMEM during lookup"); 157 } else { 158 sbuf_printf(sb, "sysctl "); 159 for (i = 0; i < la.nlen; i++) 160 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 161 sbuf_printf(sb, "} is not implemented"); 162 sbuf_finish(sb); 163 sysctl_string = sbuf_data(sb); 164 linux_msg(td, "%s", sysctl_string); 165 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 166 sysctl_string); 167 sbuf_delete(sb); 168 } 169 170 free(mib, M_LINUX); 171 172 return (ENOTDIR); 173 } 174 #endif 175