1 /* $NetBSD: linux32_sysctl.c,v 1.3 2006/09/23 22:12:00 manu Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Emmanuel Dreyfus, all rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Emmanuel Dreyfus 17 * 4. The name of the author may not be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS'' 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux32_sysctl.c,v 1.3 2006/09/23 22:12:00 manu Exp $"); 35 36 #include "opt_ktrace.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/errno.h> 41 #include <sys/proc.h> 42 #include <sys/mount.h> 43 #include <sys/sysctl.h> 44 #include <sys/sa.h> 45 #include <sys/syscallargs.h> 46 #ifdef KTRACE 47 #include <sys/ktrace.h> 48 #endif 49 50 #include <compat/netbsd32/netbsd32.h> 51 52 #include <compat/linux/common/linux_types.h> 53 #include <compat/linux/common/linux_signal.h> 54 #include <compat/linux/common/linux_sysctl.h> 55 56 #include <compat/linux/linux_syscallargs.h> 57 58 #include <compat/linux32/common/linux32_types.h> 59 #include <compat/linux32/common/linux32_signal.h> 60 #include <compat/linux32/common/linux32_sysctl.h> 61 62 #include <compat/linux32/linux32_syscallargs.h> 63 64 char linux32_sysname[128] = "Linux"; 65 char linux32_release[128] = "2.4.18"; 66 char linux32_version[128] = "#0 Wed Feb 20 20:00:02 CET 2002"; 67 68 69 SYSCTL_SETUP(sysctl_emul_linux32_setup, "sysctl emul.linux32 subtree setup") 70 { 71 72 sysctl_createv(clog, 0, NULL, NULL, 73 CTLFLAG_PERMANENT, 74 CTLTYPE_NODE, "emul", NULL, 75 NULL, 0, NULL, 0, 76 CTL_EMUL, CTL_EOL); 77 sysctl_createv(clog, 0, NULL, NULL, 78 CTLFLAG_PERMANENT, 79 CTLTYPE_NODE, "linux32", 80 SYSCTL_DESCR("Linux 32 bit emulation settings"), 81 NULL, 0, NULL, 0, 82 CTL_EMUL, EMUL_LINUX32, CTL_EOL); 83 sysctl_createv(clog, 0, NULL, NULL, 84 CTLFLAG_PERMANENT, 85 CTLTYPE_NODE, "kern", 86 SYSCTL_DESCR("Linux 32 bit kernel emulation settings"), 87 NULL, 0, NULL, 0, 88 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, CTL_EOL); 89 90 sysctl_createv(clog, 0, NULL, NULL, 91 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 92 CTLTYPE_STRING, "ostype", 93 SYSCTL_DESCR("Linux 32 bit operating system type"), 94 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 95 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 96 EMUL_LINUX32_KERN_OSTYPE, CTL_EOL); 97 sysctl_createv(clog, 0, NULL, NULL, 98 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 99 CTLTYPE_STRING, "osrelease", 100 SYSCTL_DESCR("Linux 32 bit operating system release"), 101 NULL, 0, linux32_release, sizeof(linux32_release), 102 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 103 EMUL_LINUX32_KERN_OSRELEASE, CTL_EOL); 104 sysctl_createv(clog, 0, NULL, NULL, 105 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 106 CTLTYPE_STRING, "osversion", 107 SYSCTL_DESCR("Linux 32 bit operating system revision"), 108 NULL, 0, linux32_version, sizeof(linux32_version), 109 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 110 EMUL_LINUX32_KERN_VERSION, CTL_EOL); 111 } 112 113 #ifndef _LKM 114 static 115 #endif 116 struct sysctlnode linux32_sysctl_root = { 117 .sysctl_flags = SYSCTL_VERSION| 118 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 119 .sysctl_num = 0, 120 .sysctl_name = "(linux32_root)", 121 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 122 }; 123 124 SYSCTL_SETUP(linux32_sysctl_setup, "linux32 emulated sysctl subtree setup") 125 { 126 const struct sysctlnode *node = &linux32_sysctl_root; 127 128 sysctl_createv(clog, 0, &node, &node, 129 CTLFLAG_PERMANENT, 130 CTLTYPE_NODE, "kern", NULL, 131 NULL, 0, NULL, 0, 132 LINUX_CTL_KERN, CTL_EOL); 133 134 sysctl_createv(clog, 0, &node, NULL, 135 CTLFLAG_PERMANENT, 136 CTLTYPE_STRING, "ostype", NULL, 137 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 138 LINUX_KERN_OSTYPE, CTL_EOL); 139 sysctl_createv(clog, 0, &node, NULL, 140 CTLFLAG_PERMANENT, 141 CTLTYPE_STRING, "osrelease", NULL, 142 NULL, 0, linux32_release, sizeof(linux32_release), 143 LINUX_KERN_OSRELEASE, CTL_EOL); 144 sysctl_createv(clog, 0, &node, NULL, 145 CTLFLAG_PERMANENT, 146 CTLTYPE_STRING, "version", NULL, 147 NULL, 0, linux32_version, sizeof(linux32_version), 148 LINUX_KERN_VERSION, CTL_EOL); 149 150 linux32_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 151 } 152 153 int 154 linux32_sys___sysctl(l, v, retval) 155 struct lwp *l; 156 void *v; 157 register_t *retval; 158 { 159 struct linux32_sys___sysctl_args /* { 160 syscallarg(linux32___sysctlp_t) lsp; 161 } */ *uap = v; 162 struct linux32_sysctl ls32; 163 int name[CTL_MAXNAME]; 164 size_t savelen; 165 netbsd32_size_t oldlen32; 166 size_t oldlen; 167 int error; 168 169 /* 170 * Read sysctl arguments 171 */ 172 if ((error = copyin(NETBSD32PTR64(SCARG(uap, lsp)), 173 &ls32, sizeof(ls32))) != 0) 174 return error; 175 176 /* 177 * Read oldlen 178 */ 179 if (NETBSD32PTR64(ls32.oldlenp) != NULL) { 180 if ((error = copyin(NETBSD32PTR64(ls32.oldlenp), 181 &oldlen32, sizeof(oldlen32))) != 0) 182 return error; 183 } else { 184 oldlen32 = 0; 185 } 186 187 savelen = (size_t)oldlen32; 188 189 /* 190 * Sanity check nlen 191 */ 192 if ((ls32.nlen > CTL_MAXNAME) || (ls32.nlen < 1)) 193 return EINVAL; 194 195 /* 196 * Read the sysctl name 197 */ 198 if ((error = copyin(NETBSD32PTR64(ls32.name), &name, 199 ls32.nlen * sizeof(int))) != 0) 200 return error; 201 202 #ifdef KTRACE 203 if (KTRPOINT(l->l_proc, KTR_MIB)) 204 ktrmib(l, name, ls32.nlen); 205 #endif 206 207 if ((error = sysctl_lock(l, 208 NETBSD32PTR64(ls32.oldval), savelen)) != 0) 209 return error; 210 211 /* 212 * First try linux32 tree, then linux tree 213 */ 214 oldlen = (size_t)oldlen32; 215 error = sysctl_dispatch(name, ls32.nlen, 216 NETBSD32PTR64(ls32.oldval), &oldlen, 217 NETBSD32PTR64(ls32.newval), ls32.newlen, 218 name, l, &linux32_sysctl_root); 219 oldlen32 = (netbsd32_size_t)oldlen; 220 221 sysctl_unlock(l); 222 223 /* 224 * Check for oldlen overflow (not likely, but who knows...) 225 */ 226 if (oldlen != oldlen32) { 227 #ifdef DEBUG_LINUX 228 printf("%s: oldlen32 = %d, oldlen = %ld\n", 229 __func__, oldlen32, oldlen); 230 #endif 231 return EINVAL; 232 } 233 234 /* 235 * set caller's oldlen, even if we got an error 236 */ 237 if (NETBSD32PTR64(ls32.oldlenp)) { 238 int nerror; 239 240 nerror = copyout(&oldlen32, 241 NETBSD32PTR64(ls32.oldlenp), sizeof(oldlen32)); 242 243 if (error == 0) 244 error = nerror; 245 } 246 247 /* 248 * oldlen was too short 249 */ 250 if ((error == 0) && 251 (NETBSD32PTR64(ls32.oldval) != NULL) && 252 (savelen < oldlen32)) 253 error = ENOMEM; 254 255 return error; 256 } 257