1 /*- 2 * SPDX-License-Identifier: BSD-2-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 * 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 #include <sys/param.h> 31 #include <sys/lock.h> 32 #include <sys/malloc.h> 33 #include <sys/mutex.h> 34 #include <sys/sysctl.h> 35 #include <sys/sbuf.h> 36 #include <sys/vnode.h> 37 38 #ifdef COMPAT_LINUX32 39 #include <machine/../linux32/linux.h> 40 #include <machine/../linux32/linux32_proto.h> 41 #else 42 #include <machine/../linux/linux.h> 43 #include <machine/../linux/linux_proto.h> 44 #endif 45 46 #include <compat/linux/linux_dtrace.h> 47 #include <compat/linux/linux_misc.h> 48 #include <compat/linux/linux_util.h> 49 50 #define LINUX_CTL_KERN 1 51 #define LINUX_CTL_VM 2 52 #define LINUX_CTL_NET 3 53 #define LINUX_CTL_PROC 4 54 #define LINUX_CTL_FS 5 55 #define LINUX_CTL_DEBUG 6 56 #define LINUX_CTL_DEV 7 57 #define LINUX_CTL_BUS 8 58 59 /* CTL_KERN names */ 60 #define LINUX_KERN_OSTYPE 1 61 #define LINUX_KERN_OSRELEASE 2 62 #define LINUX_KERN_OSREV 3 63 #define LINUX_KERN_VERSION 4 64 65 /* DTrace init */ 66 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 67 68 /** 69 * DTrace probes in this module. 70 */ 71 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int"); 72 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 73 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 74 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 75 76 #ifdef LINUX_LEGACY_SYSCALLS 77 static int 78 handle_string(struct l___sysctl_args *la, char *value) 79 { 80 int error; 81 82 if (la->oldval != 0) { 83 l_int len = strlen(value); 84 error = copyout(value, PTRIN(la->oldval), len + 1); 85 if (!error && la->oldlenp != 0) 86 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 87 if (error) { 88 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 89 error); 90 return (error); 91 } 92 } 93 94 if (la->newval != 0) 95 return (ENOTDIR); 96 97 return (0); 98 } 99 100 int 101 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 102 { 103 struct l___sysctl_args la; 104 struct sbuf *sb; 105 l_int *mib; 106 char *sysctl_string; 107 int error, i; 108 109 error = copyin(args->args, &la, sizeof(la)); 110 if (error) { 111 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 112 return (error); 113 } 114 115 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 116 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 117 LINUX_CTL_MAXNAME); 118 return (ENOTDIR); 119 } 120 121 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 122 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 123 if (error) { 124 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 125 free(mib, M_LINUX); 126 return (error); 127 } 128 129 switch (mib[0]) { 130 case LINUX_CTL_KERN: 131 if (la.nlen < 2) 132 break; 133 134 switch (mib[1]) { 135 case LINUX_KERN_VERSION: 136 error = handle_string(&la, version); 137 free(mib, M_LINUX); 138 return (error); 139 default: 140 break; 141 } 142 break; 143 default: 144 break; 145 } 146 147 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 148 if (sb == NULL) { 149 linux_msg(td, "sysctl is not implemented"); 150 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 151 "unknown sysctl, ENOMEM during lookup"); 152 } else { 153 sbuf_printf(sb, "sysctl "); 154 for (i = 0; i < la.nlen; i++) 155 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 156 sbuf_printf(sb, "} is not implemented"); 157 sbuf_finish(sb); 158 sysctl_string = sbuf_data(sb); 159 linux_msg(td, "%s", sysctl_string); 160 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 161 sysctl_string); 162 sbuf_delete(sb); 163 } 164 165 free(mib, M_LINUX); 166 167 return (ENOTDIR); 168 } 169 #endif 170