1 /* $NetBSD: linux32_sysctl.c,v 1.6 2007/08/15 12:07:30 ad 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 1.6 2007/08/15 12:07:30 ad Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/errno.h> 39 #include <sys/proc.h> 40 #include <sys/mount.h> 41 #include <sys/sysctl.h> 42 #include <sys/syscallargs.h> 43 #include <sys/ktrace.h> 44 45 #include <compat/netbsd32/netbsd32.h> 46 47 #include <compat/linux/common/linux_types.h> 48 #include <compat/linux/common/linux_signal.h> 49 #include <compat/linux/common/linux_sysctl.h> 50 51 #include <compat/linux/linux_syscallargs.h> 52 53 #include <compat/linux32/common/linux32_types.h> 54 #include <compat/linux32/common/linux32_signal.h> 55 #include <compat/linux32/common/linux32_sysctl.h> 56 57 #include <compat/linux32/linux32_syscallargs.h> 58 59 char linux32_sysname[128] = "Linux"; 60 char linux32_release[128] = "2.4.18"; 61 char linux32_version[128] = "#0 Wed Feb 20 20:00:02 CET 2002"; 62 63 64 SYSCTL_SETUP(sysctl_emul_linux32_setup, "sysctl emul.linux32 subtree setup") 65 { 66 67 sysctl_createv(clog, 0, NULL, NULL, 68 CTLFLAG_PERMANENT, 69 CTLTYPE_NODE, "emul", NULL, 70 NULL, 0, NULL, 0, 71 CTL_EMUL, CTL_EOL); 72 sysctl_createv(clog, 0, NULL, NULL, 73 CTLFLAG_PERMANENT, 74 CTLTYPE_NODE, "linux32", 75 SYSCTL_DESCR("Linux 32 bit emulation settings"), 76 NULL, 0, NULL, 0, 77 CTL_EMUL, EMUL_LINUX32, CTL_EOL); 78 sysctl_createv(clog, 0, NULL, NULL, 79 CTLFLAG_PERMANENT, 80 CTLTYPE_NODE, "kern", 81 SYSCTL_DESCR("Linux 32 bit kernel emulation settings"), 82 NULL, 0, NULL, 0, 83 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, CTL_EOL); 84 85 sysctl_createv(clog, 0, NULL, NULL, 86 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 87 CTLTYPE_STRING, "ostype", 88 SYSCTL_DESCR("Linux 32 bit operating system type"), 89 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 90 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 91 EMUL_LINUX32_KERN_OSTYPE, CTL_EOL); 92 sysctl_createv(clog, 0, NULL, NULL, 93 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 94 CTLTYPE_STRING, "osrelease", 95 SYSCTL_DESCR("Linux 32 bit operating system release"), 96 NULL, 0, linux32_release, sizeof(linux32_release), 97 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 98 EMUL_LINUX32_KERN_OSRELEASE, CTL_EOL); 99 sysctl_createv(clog, 0, NULL, NULL, 100 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 101 CTLTYPE_STRING, "osversion", 102 SYSCTL_DESCR("Linux 32 bit operating system revision"), 103 NULL, 0, linux32_version, sizeof(linux32_version), 104 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 105 EMUL_LINUX32_KERN_VERSION, CTL_EOL); 106 } 107 108 #ifndef _LKM 109 static 110 #endif 111 struct sysctlnode linux32_sysctl_root = { 112 .sysctl_flags = SYSCTL_VERSION| 113 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 114 .sysctl_num = 0, 115 .sysctl_name = "(linux32_root)", 116 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 117 }; 118 119 SYSCTL_SETUP(linux32_sysctl_setup, "linux32 emulated sysctl subtree setup") 120 { 121 const struct sysctlnode *node = &linux32_sysctl_root; 122 123 sysctl_createv(clog, 0, &node, &node, 124 CTLFLAG_PERMANENT, 125 CTLTYPE_NODE, "kern", NULL, 126 NULL, 0, NULL, 0, 127 LINUX_CTL_KERN, CTL_EOL); 128 129 sysctl_createv(clog, 0, &node, NULL, 130 CTLFLAG_PERMANENT, 131 CTLTYPE_STRING, "ostype", NULL, 132 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 133 LINUX_KERN_OSTYPE, CTL_EOL); 134 sysctl_createv(clog, 0, &node, NULL, 135 CTLFLAG_PERMANENT, 136 CTLTYPE_STRING, "osrelease", NULL, 137 NULL, 0, linux32_release, sizeof(linux32_release), 138 LINUX_KERN_OSRELEASE, CTL_EOL); 139 sysctl_createv(clog, 0, &node, NULL, 140 CTLFLAG_PERMANENT, 141 CTLTYPE_STRING, "version", NULL, 142 NULL, 0, linux32_version, sizeof(linux32_version), 143 LINUX_KERN_VERSION, CTL_EOL); 144 145 linux32_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 146 } 147 148 int 149 linux32_sys___sysctl(l, v, retval) 150 struct lwp *l; 151 void *v; 152 register_t *retval; 153 { 154 struct linux32_sys___sysctl_args /* { 155 syscallarg(linux32___sysctlp_t) lsp; 156 } */ *uap = v; 157 struct linux32_sysctl ls32; 158 int name[CTL_MAXNAME]; 159 size_t savelen; 160 netbsd32_size_t oldlen32; 161 size_t oldlen; 162 int error; 163 164 /* 165 * Read sysctl arguments 166 */ 167 if ((error = copyin(SCARG_P32(uap, lsp), &ls32, sizeof(ls32))) != 0) 168 return error; 169 170 /* 171 * Read oldlen 172 */ 173 if (NETBSD32PTR64(ls32.oldlenp) != NULL) { 174 if ((error = copyin(NETBSD32PTR64(ls32.oldlenp), 175 &oldlen32, sizeof(oldlen32))) != 0) 176 return error; 177 } else { 178 oldlen32 = 0; 179 } 180 181 savelen = (size_t)oldlen32; 182 183 /* 184 * Sanity check nlen 185 */ 186 if ((ls32.nlen > CTL_MAXNAME) || (ls32.nlen < 1)) 187 return EINVAL; 188 189 /* 190 * Read the sysctl name 191 */ 192 if ((error = copyin(NETBSD32PTR64(ls32.name), &name, 193 ls32.nlen * sizeof(int))) != 0) 194 return error; 195 196 ktrmib(name, ls32.nlen); 197 198 if ((error = sysctl_lock(l, 199 NETBSD32PTR64(ls32.oldval), savelen)) != 0) 200 return error; 201 202 /* 203 * First try linux32 tree, then linux tree 204 */ 205 oldlen = (size_t)oldlen32; 206 error = sysctl_dispatch(name, ls32.nlen, 207 NETBSD32PTR64(ls32.oldval), &oldlen, 208 NETBSD32PTR64(ls32.newval), ls32.newlen, 209 name, l, &linux32_sysctl_root); 210 oldlen32 = (netbsd32_size_t)oldlen; 211 212 sysctl_unlock(l); 213 214 /* 215 * Check for oldlen overflow (not likely, but who knows...) 216 */ 217 if (oldlen != oldlen32) { 218 #ifdef DEBUG_LINUX 219 printf("%s: oldlen32 = %d, oldlen = %ld\n", 220 __func__, oldlen32, oldlen); 221 #endif 222 return EINVAL; 223 } 224 225 /* 226 * set caller's oldlen, even if we got an error 227 */ 228 if (NETBSD32PTR64(ls32.oldlenp)) { 229 int nerror; 230 231 nerror = copyout(&oldlen32, 232 NETBSD32PTR64(ls32.oldlenp), sizeof(oldlen32)); 233 234 if (error == 0) 235 error = nerror; 236 } 237 238 /* 239 * oldlen was too short 240 */ 241 if ((error == 0) && 242 (NETBSD32PTR64(ls32.oldval) != NULL) && 243 (savelen < oldlen32)) 244 error = ENOMEM; 245 246 return error; 247 } 248