1 /* $NetBSD: linux_sysctl.c,v 1.46 2020/03/21 16:28:56 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 1.46 2020/03/21 16:28:56 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 /* 74 * We need an additional sysctllog here since each log can only 75 * deal with a single root node. 76 */ 77 78 static struct sysctllog *linux_clog; 79 80 void 81 linux_sysctl_fini(void) 82 { 83 84 sysctl_teardown(&linux_clog); 85 sysctl_free(&linux_sysctl_root); 86 } 87 88 SYSCTL_SETUP(linux_sysctl_setup, "linux emulation sysctls") 89 { 90 const struct sysctlnode *node = &linux_sysctl_root; 91 92 sysctl_createv(&linux_clog, 0, &node, &node, 93 CTLFLAG_PERMANENT, 94 CTLTYPE_NODE, "kern", NULL, 95 NULL, 0, NULL, 0, 96 LINUX_CTL_KERN, CTL_EOL); 97 sysctl_createv(&linux_clog, 0, &node, NULL, 98 CTLFLAG_PERMANENT, 99 CTLTYPE_STRING, "ostype", NULL, 100 NULL, 0, linux_sysname, sizeof(linux_sysname), 101 LINUX_KERN_OSTYPE, CTL_EOL); 102 sysctl_createv(&linux_clog, 0, &node, NULL, 103 CTLFLAG_PERMANENT, 104 CTLTYPE_STRING, "osrelease", NULL, 105 NULL, 0, linux_release, sizeof(linux_release), 106 LINUX_KERN_OSRELEASE, CTL_EOL); 107 sysctl_createv(&linux_clog, 0, &node, NULL, 108 CTLFLAG_PERMANENT, 109 CTLTYPE_STRING, "version", NULL, 110 NULL, 0, linux_version, sizeof(linux_version), 111 LINUX_KERN_VERSION, CTL_EOL); 112 113 sysctl_createv(clog, 0, NULL, NULL, 114 CTLFLAG_PERMANENT, 115 CTLTYPE_NODE, "linux", 116 SYSCTL_DESCR("Linux emulation settings"), 117 NULL, 0, NULL, 0, 118 CTL_EMUL, EMUL_LINUX, CTL_EOL); 119 120 sysctl_createv(clog, 0, NULL, NULL, 121 CTLFLAG_PERMANENT, 122 CTLTYPE_NODE, "kern", 123 SYSCTL_DESCR("Linux kernel emulation settings"), 124 NULL, 0, NULL, 0, 125 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 126 sysctl_createv(clog, 0, NULL, NULL, 127 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 128 CTLTYPE_STRING, "ostype", 129 SYSCTL_DESCR("Linux operating system type"), 130 NULL, 0, linux_sysname, sizeof(linux_sysname), 131 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 132 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 133 sysctl_createv(clog, 0, NULL, NULL, 134 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 135 CTLTYPE_STRING, "osrelease", 136 SYSCTL_DESCR("Linux operating system release"), 137 NULL, 0, linux_release, sizeof(linux_release), 138 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 139 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 140 sysctl_createv(clog, 0, NULL, NULL, 141 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 142 CTLTYPE_STRING, "osversion", 143 SYSCTL_DESCR("Linux operating system revision"), 144 NULL, 0, linux_version, sizeof(linux_version), 145 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 146 EMUL_LINUX_KERN_VERSION, CTL_EOL); 147 148 sysctl_createv(clog, 0, NULL, NULL, 149 CTLFLAG_READWRITE, 150 CTLTYPE_INT, "enabled", 151 SYSCTL_DESCR("Linux compat enabled."), 152 linux_sysctl_enable, 0, &linux_enabled, 0, 153 CTL_EMUL, EMUL_LINUX, CTL_CREATE, CTL_EOL); 154 155 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 156 } 157 158 /* 159 * linux sysctl system call 160 */ 161 int 162 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 163 { 164 struct linux___sysctl ls; 165 int error, nerror, name[CTL_MAXNAME]; 166 size_t savelen = 0, oldlen = 0; 167 168 /* 169 * get linux args structure 170 */ 171 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 172 return error; 173 174 /* 175 * get oldlen 176 */ 177 oldlen = 0; 178 if (ls.oldlenp != NULL) { 179 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 180 if (error) 181 return (error); 182 } 183 savelen = oldlen; 184 185 /* 186 * top-level sysctl names may or may not be non-terminal, but 187 * we don't care 188 */ 189 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 190 return (ENOTDIR); 191 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 192 if (error) 193 return (error); 194 195 ktrmib(name, ls.nlen); 196 197 /* 198 * dispatch request into linux sysctl tree 199 */ 200 sysctl_lock(ls.newval != NULL); 201 error = sysctl_dispatch(&name[0], ls.nlen, 202 ls.oldval, &oldlen, 203 ls.newval, ls.newlen, 204 &name[0], l, &linux_sysctl_root); 205 sysctl_unlock(); 206 207 /* 208 * reset caller's oldlen, even if we got an error 209 */ 210 if (ls.oldlenp) { 211 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 212 if (error == 0) 213 error = nerror; 214 } 215 216 /* 217 * if the only problem is that we weren't given enough space, 218 * that's an ENOMEM error 219 */ 220 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 221 error = ENOMEM; 222 223 return (error); 224 } 225