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/param.h> 30 #include <sys/lock.h> 31 #include <sys/malloc.h> 32 #include <sys/mutex.h> 33 #include <sys/sysctl.h> 34 #include <sys/sbuf.h> 35 #include <sys/vnode.h> 36 37 #ifdef COMPAT_LINUX32 38 #include <machine/../linux32/linux.h> 39 #include <machine/../linux32/linux32_proto.h> 40 #else 41 #include <machine/../linux/linux.h> 42 #include <machine/../linux/linux_proto.h> 43 #endif 44 45 #include <compat/linux/linux_dtrace.h> 46 #include <compat/linux/linux_misc.h> 47 #include <compat/linux/linux_util.h> 48 49 #define LINUX_CTL_KERN 1 50 #define LINUX_CTL_VM 2 51 #define LINUX_CTL_NET 3 52 #define LINUX_CTL_PROC 4 53 #define LINUX_CTL_FS 5 54 #define LINUX_CTL_DEBUG 6 55 #define LINUX_CTL_DEV 7 56 #define LINUX_CTL_BUS 8 57 58 /* CTL_KERN names */ 59 #define LINUX_KERN_OSTYPE 1 60 #define LINUX_KERN_OSRELEASE 2 61 #define LINUX_KERN_OSREV 3 62 #define LINUX_KERN_VERSION 4 63 64 /* DTrace init */ 65 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 66 67 /** 68 * DTrace probes in this module. 69 */ 70 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int"); 71 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int"); 72 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int"); 73 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *"); 74 75 #ifdef LINUX_LEGACY_SYSCALLS 76 static int 77 handle_string(struct l___sysctl_args *la, char *value) 78 { 79 int error; 80 81 if (la->oldval != 0) { 82 l_int len = strlen(value); 83 error = copyout(value, PTRIN(la->oldval), len + 1); 84 if (!error && la->oldlenp != 0) 85 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len)); 86 if (error) { 87 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error, 88 error); 89 return (error); 90 } 91 } 92 93 if (la->newval != 0) 94 return (ENOTDIR); 95 96 return (0); 97 } 98 99 int 100 linux_sysctl(struct thread *td, struct linux_sysctl_args *args) 101 { 102 struct l___sysctl_args la; 103 struct sbuf *sb; 104 l_int *mib; 105 char *sysctl_string; 106 int error, i; 107 108 error = copyin(args->args, &la, sizeof(la)); 109 if (error) { 110 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 111 return (error); 112 } 113 114 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) { 115 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen, 116 LINUX_CTL_MAXNAME); 117 return (ENOTDIR); 118 } 119 120 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK); 121 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int)); 122 if (error) { 123 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error); 124 free(mib, M_LINUX); 125 return (error); 126 } 127 128 switch (mib[0]) { 129 case LINUX_CTL_KERN: 130 if (la.nlen < 2) 131 break; 132 133 switch (mib[1]) { 134 case LINUX_KERN_VERSION: 135 error = handle_string(&la, version); 136 free(mib, M_LINUX); 137 return (error); 138 default: 139 break; 140 } 141 break; 142 default: 143 break; 144 } 145 146 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND); 147 if (sb == NULL) { 148 linux_msg(td, "sysctl is not implemented"); 149 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 150 "unknown sysctl, ENOMEM during lookup"); 151 } else { 152 sbuf_printf(sb, "sysctl "); 153 for (i = 0; i < la.nlen; i++) 154 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]); 155 sbuf_printf(sb, "} is not implemented"); 156 sbuf_finish(sb); 157 sysctl_string = sbuf_data(sb); 158 linux_msg(td, "%s", sysctl_string); 159 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl, 160 sysctl_string); 161 sbuf_delete(sb); 162 } 163 164 free(mib, M_LINUX); 165 166 return (ENOTDIR); 167 } 168 #endif 169