1 /* $NetBSD: linux_sysctl.c,v 1.48 2023/07/10 02:31:55 christos 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 1.48 2023/07/10 02:31:55 christos 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] = "6.3.10"; 61 char linux_version[128] = "#1 SMP PREEMPT_DYNAMIC Wed Jun 28 18:34:30 UTC 2023"; 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 #if !defined(__aarch64__) 89 90 SYSCTL_SETUP(linux_sysctl_setup, "linux emulation sysctls") 91 { 92 const struct sysctlnode *node = &linux_sysctl_root; 93 94 sysctl_createv(&linux_clog, 0, &node, &node, 95 CTLFLAG_PERMANENT, 96 CTLTYPE_NODE, "kern", NULL, 97 NULL, 0, NULL, 0, 98 LINUX_CTL_KERN, CTL_EOL); 99 sysctl_createv(&linux_clog, 0, &node, NULL, 100 CTLFLAG_PERMANENT, 101 CTLTYPE_STRING, "ostype", NULL, 102 NULL, 0, linux_sysname, sizeof(linux_sysname), 103 LINUX_KERN_OSTYPE, CTL_EOL); 104 sysctl_createv(&linux_clog, 0, &node, NULL, 105 CTLFLAG_PERMANENT, 106 CTLTYPE_STRING, "osrelease", NULL, 107 NULL, 0, linux_release, sizeof(linux_release), 108 LINUX_KERN_OSRELEASE, CTL_EOL); 109 sysctl_createv(&linux_clog, 0, &node, NULL, 110 CTLFLAG_PERMANENT, 111 CTLTYPE_STRING, "version", NULL, 112 NULL, 0, linux_version, sizeof(linux_version), 113 LINUX_KERN_VERSION, CTL_EOL); 114 115 sysctl_createv(clog, 0, NULL, NULL, 116 CTLFLAG_PERMANENT, 117 CTLTYPE_NODE, "linux", 118 SYSCTL_DESCR("Linux emulation settings"), 119 NULL, 0, NULL, 0, 120 CTL_EMUL, EMUL_LINUX, CTL_EOL); 121 122 sysctl_createv(clog, 0, NULL, NULL, 123 CTLFLAG_PERMANENT, 124 CTLTYPE_NODE, "kern", 125 SYSCTL_DESCR("Linux kernel emulation settings"), 126 NULL, 0, NULL, 0, 127 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 128 sysctl_createv(clog, 0, NULL, NULL, 129 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 130 CTLTYPE_STRING, "ostype", 131 SYSCTL_DESCR("Linux operating system type"), 132 NULL, 0, linux_sysname, sizeof(linux_sysname), 133 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 134 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 135 sysctl_createv(clog, 0, NULL, NULL, 136 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 137 CTLTYPE_STRING, "osrelease", 138 SYSCTL_DESCR("Linux operating system release"), 139 NULL, 0, linux_release, sizeof(linux_release), 140 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 141 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 142 sysctl_createv(clog, 0, NULL, NULL, 143 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 144 CTLTYPE_STRING, "osversion", 145 SYSCTL_DESCR("Linux operating system revision"), 146 NULL, 0, linux_version, sizeof(linux_version), 147 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 148 EMUL_LINUX_KERN_VERSION, CTL_EOL); 149 150 sysctl_createv(clog, 0, NULL, NULL, 151 CTLFLAG_READWRITE, 152 CTLTYPE_INT, "enabled", 153 SYSCTL_DESCR("Linux compat enabled."), 154 linux_sysctl_enable, 0, &linux_enabled, 0, 155 CTL_EMUL, EMUL_LINUX, CTL_CREATE, CTL_EOL); 156 157 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 158 } 159 160 /* 161 * linux sysctl system call 162 */ 163 int 164 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 165 { 166 struct linux___sysctl ls; 167 int error, nerror, name[CTL_MAXNAME]; 168 size_t savelen = 0, oldlen = 0; 169 170 /* 171 * get linux args structure 172 */ 173 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 174 return error; 175 176 /* 177 * get oldlen 178 */ 179 oldlen = 0; 180 if (ls.oldlenp != NULL) { 181 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 182 if (error) 183 return (error); 184 } 185 savelen = oldlen; 186 187 /* 188 * top-level sysctl names may or may not be non-terminal, but 189 * we don't care 190 */ 191 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 192 return (ENOTDIR); 193 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 194 if (error) 195 return (error); 196 197 ktrmib(name, ls.nlen); 198 199 /* 200 * dispatch request into linux sysctl tree 201 */ 202 sysctl_lock(ls.newval != NULL); 203 error = sysctl_dispatch(&name[0], ls.nlen, 204 ls.oldval, &oldlen, 205 ls.newval, ls.newlen, 206 &name[0], l, &linux_sysctl_root); 207 sysctl_unlock(); 208 209 /* 210 * reset caller's oldlen, even if we got an error 211 */ 212 if (ls.oldlenp) { 213 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 214 if (error == 0) 215 error = nerror; 216 } 217 218 /* 219 * if the only problem is that we weren't given enough space, 220 * that's an ENOMEM error 221 */ 222 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 223 error = ENOMEM; 224 225 return (error); 226 } 227 #endif 228
Indexes created Sat Sep 20 22:09:52 GMT 2025