linux_sysctl.c revision 1.40.18.2
1 /* $NetBSD: linux_sysctl.c,v 1.40.18.2 2017/12/03 11:36:55 jdolecek 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 1.40.18.2 2017/12/03 11:36:55 jdolecek 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 extern int linux_enabled; 74 75 void 76 linux_sysctl_fini(void) 77 { 78 79 sysctl_teardown(&linux_clog2); 80 sysctl_teardown(&linux_clog1); 81 sysctl_free(&linux_sysctl_root); 82 } 83 84 void 85 linux_sysctl_init(void) 86 { 87 const struct sysctlnode *node = &linux_sysctl_root; 88 89 sysctl_createv(&linux_clog1, 0, &node, &node, 90 CTLFLAG_PERMANENT, 91 CTLTYPE_NODE, "kern", NULL, 92 NULL, 0, NULL, 0, 93 LINUX_CTL_KERN, CTL_EOL); 94 sysctl_createv(&linux_clog1, 0, &node, NULL, 95 CTLFLAG_PERMANENT, 96 CTLTYPE_STRING, "ostype", NULL, 97 NULL, 0, linux_sysname, sizeof(linux_sysname), 98 LINUX_KERN_OSTYPE, CTL_EOL); 99 sysctl_createv(&linux_clog1, 0, &node, NULL, 100 CTLFLAG_PERMANENT, 101 CTLTYPE_STRING, "osrelease", NULL, 102 NULL, 0, linux_release, sizeof(linux_release), 103 LINUX_KERN_OSRELEASE, CTL_EOL); 104 sysctl_createv(&linux_clog1, 0, &node, NULL, 105 CTLFLAG_PERMANENT, 106 CTLTYPE_STRING, "version", NULL, 107 NULL, 0, linux_version, sizeof(linux_version), 108 LINUX_KERN_VERSION, CTL_EOL); 109 110 sysctl_createv(&linux_clog2, 0, NULL, NULL, 111 CTLFLAG_PERMANENT, 112 CTLTYPE_NODE, "linux", 113 SYSCTL_DESCR("Linux emulation settings"), 114 NULL, 0, NULL, 0, 115 CTL_EMUL, EMUL_LINUX, CTL_EOL); 116 117 sysctl_createv(&linux_clog2, 0, NULL, NULL, 118 CTLFLAG_PERMANENT, 119 CTLTYPE_NODE, "kern", 120 SYSCTL_DESCR("Linux kernel emulation settings"), 121 NULL, 0, NULL, 0, 122 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 123 sysctl_createv(&linux_clog2, 0, NULL, NULL, 124 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 125 CTLTYPE_STRING, "ostype", 126 SYSCTL_DESCR("Linux operating system type"), 127 NULL, 0, linux_sysname, sizeof(linux_sysname), 128 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 129 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 130 sysctl_createv(&linux_clog2, 0, NULL, NULL, 131 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 132 CTLTYPE_STRING, "osrelease", 133 SYSCTL_DESCR("Linux operating system release"), 134 NULL, 0, linux_release, sizeof(linux_release), 135 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 136 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 137 sysctl_createv(&linux_clog2, 0, NULL, NULL, 138 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 139 CTLTYPE_STRING, "osversion", 140 SYSCTL_DESCR("Linux operating system revision"), 141 NULL, 0, linux_version, sizeof(linux_version), 142 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 143 EMUL_LINUX_KERN_VERSION, CTL_EOL); 144 145 sysctl_createv(&linux_clog2, 0, NULL, NULL, 146 CTLFLAG_READWRITE, 147 CTLTYPE_INT, "enabled", 148 SYSCTL_DESCR("Linux compat enabled."), 149 linux_sysctl_enable, 0, &linux_enabled, 0, 150 CTL_EMUL, EMUL_LINUX, CTL_CREATE, CTL_EOL); 151 152 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 153 } 154 155 /* 156 * linux sysctl system call 157 */ 158 int 159 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 160 { 161 struct linux___sysctl ls; 162 int error, nerror, name[CTL_MAXNAME]; 163 size_t savelen = 0, oldlen = 0; 164 165 /* 166 * get linux args structure 167 */ 168 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 169 return error; 170 171 /* 172 * get oldlen 173 */ 174 oldlen = 0; 175 if (ls.oldlenp != NULL) { 176 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 177 if (error) 178 return (error); 179 } 180 savelen = oldlen; 181 182 /* 183 * top-level sysctl names may or may not be non-terminal, but 184 * we don't care 185 */ 186 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 187 return (ENOTDIR); 188 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 189 if (error) 190 return (error); 191 192 ktrmib(name, ls.nlen); 193 194 /* 195 * dispatch request into linux sysctl tree 196 */ 197 sysctl_lock(ls.newval != NULL); 198 error = sysctl_dispatch(&name[0], ls.nlen, 199 ls.oldval, &oldlen, 200 ls.newval, ls.newlen, 201 &name[0], l, &linux_sysctl_root); 202 sysctl_unlock(); 203 204 /* 205 * reset caller's oldlen, even if we got an error 206 */ 207 if (ls.oldlenp) { 208 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 209 if (error == 0) 210 error = nerror; 211 } 212 213 /* 214 * if the only problem is that we weren't given enough space, 215 * that's an ENOMEM error 216 */ 217 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 218 error = ENOMEM; 219 220 return (error); 221 } 222
Indexes created Sat Sep 27 14:09:57 GMT 2025