1 /* $NetBSD: linux_sysctl.c,v 1.45 2020/03/16 21:20:09 pgoyette 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 1.45 2020/03/16 21:20:09 pgoyette 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 extern int linux_enabled; 72 73 SYSCTL_SETUP(linux_sysctl_setup, "linux emulation sysctls") 74 { 75 const struct sysctlnode *node = &linux_sysctl_root; 76 77 sysctl_createv(clog, 0, &node, &node, 78 CTLFLAG_PERMANENT, 79 CTLTYPE_NODE, "kern", NULL, 80 NULL, 0, NULL, 0, 81 LINUX_CTL_KERN, CTL_EOL); 82 sysctl_createv(clog, 0, &node, NULL, 83 CTLFLAG_PERMANENT, 84 CTLTYPE_STRING, "ostype", NULL, 85 NULL, 0, linux_sysname, sizeof(linux_sysname), 86 LINUX_KERN_OSTYPE, CTL_EOL); 87 sysctl_createv(clog, 0, &node, NULL, 88 CTLFLAG_PERMANENT, 89 CTLTYPE_STRING, "osrelease", NULL, 90 NULL, 0, linux_release, sizeof(linux_release), 91 LINUX_KERN_OSRELEASE, CTL_EOL); 92 sysctl_createv(clog, 0, &node, NULL, 93 CTLFLAG_PERMANENT, 94 CTLTYPE_STRING, "version", NULL, 95 NULL, 0, linux_version, sizeof(linux_version), 96 LINUX_KERN_VERSION, CTL_EOL); 97 98 sysctl_createv(clog, 0, NULL, NULL, 99 CTLFLAG_PERMANENT, 100 CTLTYPE_NODE, "linux", 101 SYSCTL_DESCR("Linux emulation settings"), 102 NULL, 0, NULL, 0, 103 CTL_EMUL, EMUL_LINUX, CTL_EOL); 104 105 sysctl_createv(clog, 0, NULL, NULL, 106 CTLFLAG_PERMANENT, 107 CTLTYPE_NODE, "kern", 108 SYSCTL_DESCR("Linux kernel emulation settings"), 109 NULL, 0, NULL, 0, 110 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 111 sysctl_createv(clog, 0, NULL, NULL, 112 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 113 CTLTYPE_STRING, "ostype", 114 SYSCTL_DESCR("Linux operating system type"), 115 NULL, 0, linux_sysname, sizeof(linux_sysname), 116 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 117 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 118 sysctl_createv(clog, 0, NULL, NULL, 119 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 120 CTLTYPE_STRING, "osrelease", 121 SYSCTL_DESCR("Linux operating system release"), 122 NULL, 0, linux_release, sizeof(linux_release), 123 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 124 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 125 sysctl_createv(clog, 0, NULL, NULL, 126 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 127 CTLTYPE_STRING, "osversion", 128 SYSCTL_DESCR("Linux operating system revision"), 129 NULL, 0, linux_version, sizeof(linux_version), 130 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 131 EMUL_LINUX_KERN_VERSION, CTL_EOL); 132 133 sysctl_createv(clog, 0, NULL, NULL, 134 CTLFLAG_READWRITE, 135 CTLTYPE_INT, "enabled", 136 SYSCTL_DESCR("Linux compat enabled."), 137 linux_sysctl_enable, 0, &linux_enabled, 0, 138 CTL_EMUL, EMUL_LINUX, CTL_CREATE, CTL_EOL); 139 140 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 141 } 142 143 /* 144 * linux sysctl system call 145 */ 146 int 147 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 148 { 149 struct linux___sysctl ls; 150 int error, nerror, name[CTL_MAXNAME]; 151 size_t savelen = 0, oldlen = 0; 152 153 /* 154 * get linux args structure 155 */ 156 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 157 return error; 158 159 /* 160 * get oldlen 161 */ 162 oldlen = 0; 163 if (ls.oldlenp != NULL) { 164 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 165 if (error) 166 return (error); 167 } 168 savelen = oldlen; 169 170 /* 171 * top-level sysctl names may or may not be non-terminal, but 172 * we don't care 173 */ 174 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 175 return (ENOTDIR); 176 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 177 if (error) 178 return (error); 179 180 ktrmib(name, ls.nlen); 181 182 /* 183 * dispatch request into linux sysctl tree 184 */ 185 sysctl_lock(ls.newval != NULL); 186 error = sysctl_dispatch(&name[0], ls.nlen, 187 ls.oldval, &oldlen, 188 ls.newval, ls.newlen, 189 &name[0], l, &linux_sysctl_root); 190 sysctl_unlock(); 191 192 /* 193 * reset caller's oldlen, even if we got an error 194 */ 195 if (ls.oldlenp) { 196 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 197 if (error == 0) 198 error = nerror; 199 } 200 201 /* 202 * if the only problem is that we weren't given enough space, 203 * that's an ENOMEM error 204 */ 205 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 206 error = ENOMEM; 207 208 return (error); 209 } 210