1 /* $NetBSD: linux_sysctl.c,v 1.43 2014/05/16 12:22:32 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2003, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Brown. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * sysctl system call. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: linux_sysctl.c,v 1.43 2014/05/16 12:22:32 martin Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/proc.h> 43 #include <sys/mount.h> 44 #include <sys/sysctl.h> 45 #include <sys/sched.h> 46 #include <sys/syscallargs.h> 47 #include <sys/ktrace.h> 48 49 #include <compat/linux/common/linux_types.h> 50 #include <compat/linux/common/linux_signal.h> 51 #include <compat/linux/common/linux_ipc.h> 52 #include <compat/linux/common/linux_sem.h> 53 54 #include <compat/linux/linux_syscallargs.h> 55 #include <compat/linux/common/linux_sysctl.h> 56 #include <compat/linux/common/linux_exec.h> 57 #include <compat/linux/common/linux_machdep.h> 58 59 char linux_sysname[128] = "Linux"; 60 char linux_release[128] = "3.11.6"; 61 char linux_version[128] = "#1 SMP PREEMPT Thu Oct 24 16:23:02 UTC 2013"; 62 63 struct sysctlnode linux_sysctl_root = { 64 .sysctl_flags = SYSCTL_VERSION| 65 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 66 .sysctl_num = 0, 67 .sysctl_name = "(linux_root)", 68 .sysctl_size = sizeof(struct sysctlnode), 69 }; 70 71 static struct sysctllog *linux_clog1; 72 static struct sysctllog *linux_clog2; 73 74 void 75 linux_sysctl_fini(void) 76 { 77 78 sysctl_teardown(&linux_clog2); 79 sysctl_teardown(&linux_clog1); 80 sysctl_free(&linux_sysctl_root); 81 } 82 83 void 84 linux_sysctl_init(void) 85 { 86 const struct sysctlnode *node = &linux_sysctl_root; 87 88 sysctl_createv(&linux_clog1, 0, &node, &node, 89 CTLFLAG_PERMANENT, 90 CTLTYPE_NODE, "kern", NULL, 91 NULL, 0, NULL, 0, 92 LINUX_CTL_KERN, CTL_EOL); 93 sysctl_createv(&linux_clog1, 0, &node, NULL, 94 CTLFLAG_PERMANENT, 95 CTLTYPE_STRING, "ostype", NULL, 96 NULL, 0, linux_sysname, sizeof(linux_sysname), 97 LINUX_KERN_OSTYPE, CTL_EOL); 98 sysctl_createv(&linux_clog1, 0, &node, NULL, 99 CTLFLAG_PERMANENT, 100 CTLTYPE_STRING, "osrelease", NULL, 101 NULL, 0, linux_release, sizeof(linux_release), 102 LINUX_KERN_OSRELEASE, CTL_EOL); 103 sysctl_createv(&linux_clog1, 0, &node, NULL, 104 CTLFLAG_PERMANENT, 105 CTLTYPE_STRING, "version", NULL, 106 NULL, 0, linux_version, sizeof(linux_version), 107 LINUX_KERN_VERSION, CTL_EOL); 108 109 sysctl_createv(&linux_clog2, 0, NULL, NULL, 110 CTLFLAG_PERMANENT, 111 CTLTYPE_NODE, "linux", 112 SYSCTL_DESCR("Linux emulation settings"), 113 NULL, 0, NULL, 0, 114 CTL_EMUL, EMUL_LINUX, CTL_EOL); 115 sysctl_createv(&linux_clog2, 0, NULL, NULL, 116 CTLFLAG_PERMANENT, 117 CTLTYPE_NODE, "kern", 118 SYSCTL_DESCR("Linux kernel emulation settings"), 119 NULL, 0, NULL, 0, 120 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 121 sysctl_createv(&linux_clog2, 0, NULL, NULL, 122 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 123 CTLTYPE_STRING, "ostype", 124 SYSCTL_DESCR("Linux operating system type"), 125 NULL, 0, linux_sysname, sizeof(linux_sysname), 126 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 127 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 128 sysctl_createv(&linux_clog2, 0, NULL, NULL, 129 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 130 CTLTYPE_STRING, "osrelease", 131 SYSCTL_DESCR("Linux operating system release"), 132 NULL, 0, linux_release, sizeof(linux_release), 133 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 134 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 135 sysctl_createv(&linux_clog2, 0, NULL, NULL, 136 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 137 CTLTYPE_STRING, "osversion", 138 SYSCTL_DESCR("Linux operating system revision"), 139 NULL, 0, linux_version, sizeof(linux_version), 140 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 141 EMUL_LINUX_KERN_VERSION, CTL_EOL); 142 143 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 144 } 145 146 /* 147 * linux sysctl system call 148 */ 149 int 150 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 151 { 152 struct linux___sysctl ls; 153 int error, nerror, name[CTL_MAXNAME]; 154 size_t savelen = 0, oldlen = 0; 155 156 /* 157 * get linux args structure 158 */ 159 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 160 return error; 161 162 /* 163 * get oldlen 164 */ 165 oldlen = 0; 166 if (ls.oldlenp != NULL) { 167 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 168 if (error) 169 return (error); 170 } 171 savelen = oldlen; 172 173 /* 174 * top-level sysctl names may or may not be non-terminal, but 175 * we don't care 176 */ 177 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 178 return (ENOTDIR); 179 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 180 if (error) 181 return (error); 182 183 ktrmib(name, ls.nlen); 184 185 /* 186 * dispatch request into linux sysctl tree 187 */ 188 sysctl_lock(ls.newval != NULL); 189 error = sysctl_dispatch(&name[0], ls.nlen, 190 ls.oldval, &oldlen, 191 ls.newval, ls.newlen, 192 &name[0], l, &linux_sysctl_root); 193 sysctl_unlock(); 194 195 /* 196 * reset caller's oldlen, even if we got an error 197 */ 198 if (ls.oldlenp) { 199 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 200 if (error == 0) 201 error = nerror; 202 } 203 204 /* 205 * if the only problem is that we weren't given enough space, 206 * that's an ENOMEM error 207 */ 208 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 209 error = ENOMEM; 210 211 return (error); 212 } 213