1 /* $NetBSD: linux32_sysctl.c,v 1.17 2017/09/29 17:47:29 maxv 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 1.17 2017/09/29 17:47:29 maxv 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 #include <compat/linux/common/linux_ipc.h> 51 #include <compat/linux/common/linux_sem.h> 52 #include <compat/linux/linux_syscallargs.h> 53 54 #include <compat/linux32/common/linux32_types.h> 55 #include <compat/linux32/common/linux32_signal.h> 56 #include <compat/linux32/common/linux32_sysctl.h> 57 #include <compat/linux32/linux32_syscallargs.h> 58 59 char linux32_sysname[128] = "Linux"; 60 char linux32_release[128] = "3.11.6"; 61 char linux32_version[128] = "#1 SMP PREEMPT Thu Oct 24 16:23:02 UTC 2013"; 62 63 struct sysctlnode linux32_sysctl_root = { 64 .sysctl_flags = SYSCTL_VERSION| 65 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 66 .sysctl_num = 0, 67 .sysctl_name = "(linux32_root)", 68 .sysctl_size = sizeof(struct sysctlnode), 69 }; 70 71 static struct sysctllog *linux32_clog1; 72 static struct sysctllog *linux32_clog2; 73 extern int linux32_enabled; 74 75 void 76 linux32_sysctl_fini(void) 77 { 78 79 sysctl_teardown(&linux32_clog2); 80 sysctl_teardown(&linux32_clog1); 81 sysctl_free(&linux32_sysctl_root); 82 } 83 84 void 85 linux32_sysctl_init(void) 86 { 87 const struct sysctlnode *node = &linux32_sysctl_root; 88 89 sysctl_createv(&linux32_clog1, 0, NULL, NULL, 90 CTLFLAG_PERMANENT, 91 CTLTYPE_NODE, "linux32", 92 SYSCTL_DESCR("Linux 32 bit emulation settings"), 93 NULL, 0, NULL, 0, 94 CTL_EMUL, EMUL_LINUX32, CTL_EOL); 95 sysctl_createv(&linux32_clog1, 0, NULL, NULL, 96 CTLFLAG_PERMANENT, 97 CTLTYPE_NODE, "kern", 98 SYSCTL_DESCR("Linux 32 bit kernel emulation settings"), 99 NULL, 0, NULL, 0, 100 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, CTL_EOL); 101 102 sysctl_createv(&linux32_clog1, 0, NULL, NULL, 103 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 104 CTLTYPE_STRING, "ostype", 105 SYSCTL_DESCR("Linux 32 bit operating system type"), 106 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 107 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 108 EMUL_LINUX32_KERN_OSTYPE, CTL_EOL); 109 sysctl_createv(&linux32_clog1, 0, NULL, NULL, 110 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 111 CTLTYPE_STRING, "osrelease", 112 SYSCTL_DESCR("Linux 32 bit operating system release"), 113 NULL, 0, linux32_release, sizeof(linux32_release), 114 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 115 EMUL_LINUX32_KERN_OSRELEASE, CTL_EOL); 116 sysctl_createv(&linux32_clog1, 0, NULL, NULL, 117 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 118 CTLTYPE_STRING, "osversion", 119 SYSCTL_DESCR("Linux 32 bit operating system revision"), 120 NULL, 0, linux32_version, sizeof(linux32_version), 121 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 122 EMUL_LINUX32_KERN_VERSION, CTL_EOL); 123 sysctl_createv(&linux32_clog1, 0, NULL, NULL, 124 CTLFLAG_READWRITE, 125 CTLTYPE_INT, "enabled", 126 SYSCTL_DESCR("Linux 32 bit compat enabled."), 127 linux32_sysctl_enable, 0, &linux32_enabled, 0, 128 CTL_EMUL, EMUL_LINUX32, CTL_CREATE, CTL_EOL); 129 130 sysctl_createv(&linux32_clog2, 0, &node, &node, 131 CTLFLAG_PERMANENT, 132 CTLTYPE_NODE, "kern", NULL, 133 NULL, 0, NULL, 0, 134 LINUX_CTL_KERN, CTL_EOL); 135 136 sysctl_createv(&linux32_clog2, 0, &node, NULL, 137 CTLFLAG_PERMANENT, 138 CTLTYPE_STRING, "ostype", NULL, 139 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 140 LINUX_KERN_OSTYPE, CTL_EOL); 141 sysctl_createv(&linux32_clog2, 0, &node, NULL, 142 CTLFLAG_PERMANENT, 143 CTLTYPE_STRING, "osrelease", NULL, 144 NULL, 0, linux32_release, sizeof(linux32_release), 145 LINUX_KERN_OSRELEASE, CTL_EOL); 146 sysctl_createv(&linux32_clog2, 0, &node, NULL, 147 CTLFLAG_PERMANENT, 148 CTLTYPE_STRING, "version", NULL, 149 NULL, 0, linux32_version, sizeof(linux32_version), 150 LINUX_KERN_VERSION, CTL_EOL); 151 152 linux32_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 153 } 154 155 int 156 linux32_sys___sysctl(struct lwp *l, const struct linux32_sys___sysctl_args *uap, register_t *retval) 157 { 158 /* { 159 syscallarg(linux32___sysctlp_t) lsp; 160 } */ 161 struct linux32_sysctl ls32; 162 int name[CTL_MAXNAME]; 163 size_t savelen; 164 netbsd32_size_t oldlen32; 165 size_t oldlen; 166 int error; 167 168 /* 169 * Read sysctl arguments 170 */ 171 if ((error = copyin(SCARG_P32(uap, lsp), &ls32, sizeof(ls32))) != 0) 172 return error; 173 174 /* 175 * Read oldlen 176 */ 177 if (NETBSD32PTR64(ls32.oldlenp) != NULL) { 178 if ((error = copyin(NETBSD32PTR64(ls32.oldlenp), 179 &oldlen32, sizeof(oldlen32))) != 0) 180 return error; 181 } else { 182 oldlen32 = 0; 183 } 184 185 savelen = (size_t)oldlen32; 186 187 /* 188 * Sanity check nlen 189 */ 190 if ((ls32.nlen > CTL_MAXNAME) || (ls32.nlen < 1)) 191 return ENOTDIR; 192 193 /* 194 * Read the sysctl name 195 */ 196 if ((error = copyin(NETBSD32PTR64(ls32.name), &name, 197 ls32.nlen * sizeof(int))) != 0) 198 return error; 199 200 ktrmib(name, ls32.nlen); 201 /* 202 * First try linux32 tree, then linux tree 203 */ 204 oldlen = (size_t)oldlen32; 205 sysctl_lock(NETBSD32PTR64(ls32.newval) != NULL); 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 sysctl_unlock(); 212 213 /* 214 * Check for oldlen overflow (not likely, but who knows...) 215 */ 216 if (oldlen != oldlen32) { 217 #ifdef DEBUG_LINUX 218 printf("%s: oldlen32 = %d, oldlen = %ld\n", 219 __func__, oldlen32, oldlen); 220 #endif 221 return EINVAL; 222 } 223 224 /* 225 * set caller's oldlen, even if we got an error 226 */ 227 if (NETBSD32PTR64(ls32.oldlenp)) { 228 int nerror; 229 230 nerror = copyout(&oldlen32, 231 NETBSD32PTR64(ls32.oldlenp), sizeof(oldlen32)); 232 233 if (error == 0) 234 error = nerror; 235 } 236 237 /* 238 * oldlen was too short 239 */ 240 if ((error == 0) && 241 (NETBSD32PTR64(ls32.oldval) != NULL) && 242 (savelen < oldlen32)) 243 error = ENOMEM; 244 245 return error; 246 } 247