1 /* $NetBSD: linux32_sysctl.c,v 1.18 2020/03/16 21:20:09 pgoyette 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 1.18 2020/03/16 21:20:09 pgoyette 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 extern int linux32_enabled; 72 73 SYSCTL_SETUP(linux32_sysctl_init, "linux32 emulation sysctls") 74 { 75 const struct sysctlnode *node = &linux32_sysctl_root; 76 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 sysctl_createv(clog, 0, NULL, NULL, 112 CTLFLAG_READWRITE, 113 CTLTYPE_INT, "enabled", 114 SYSCTL_DESCR("Linux 32 bit compat enabled."), 115 linux32_sysctl_enable, 0, &linux32_enabled, 0, 116 CTL_EMUL, EMUL_LINUX32, CTL_CREATE, CTL_EOL); 117 118 sysctl_createv(clog, 0, &node, &node, 119 CTLFLAG_PERMANENT, 120 CTLTYPE_NODE, "kern", NULL, 121 NULL, 0, NULL, 0, 122 LINUX_CTL_KERN, CTL_EOL); 123 124 sysctl_createv(clog, 0, &node, NULL, 125 CTLFLAG_PERMANENT, 126 CTLTYPE_STRING, "ostype", NULL, 127 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 128 LINUX_KERN_OSTYPE, CTL_EOL); 129 sysctl_createv(clog, 0, &node, NULL, 130 CTLFLAG_PERMANENT, 131 CTLTYPE_STRING, "osrelease", NULL, 132 NULL, 0, linux32_release, sizeof(linux32_release), 133 LINUX_KERN_OSRELEASE, CTL_EOL); 134 sysctl_createv(clog, 0, &node, NULL, 135 CTLFLAG_PERMANENT, 136 CTLTYPE_STRING, "version", NULL, 137 NULL, 0, linux32_version, sizeof(linux32_version), 138 LINUX_KERN_VERSION, CTL_EOL); 139 140 linux32_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 141 } 142 143 int 144 linux32_sys___sysctl(struct lwp *l, const struct linux32_sys___sysctl_args *uap, register_t *retval) 145 { 146 /* { 147 syscallarg(linux32___sysctlp_t) lsp; 148 } */ 149 struct linux32_sysctl ls32; 150 int name[CTL_MAXNAME]; 151 size_t savelen; 152 netbsd32_size_t oldlen32; 153 size_t oldlen; 154 int error; 155 156 /* 157 * Read sysctl arguments 158 */ 159 if ((error = copyin(SCARG_P32(uap, lsp), &ls32, sizeof(ls32))) != 0) 160 return error; 161 162 /* 163 * Read oldlen 164 */ 165 if (NETBSD32PTR64(ls32.oldlenp) != NULL) { 166 if ((error = copyin(NETBSD32PTR64(ls32.oldlenp), 167 &oldlen32, sizeof(oldlen32))) != 0) 168 return error; 169 } else { 170 oldlen32 = 0; 171 } 172 173 savelen = (size_t)oldlen32; 174 175 /* 176 * Sanity check nlen 177 */ 178 if ((ls32.nlen > CTL_MAXNAME) || (ls32.nlen < 1)) 179 return ENOTDIR; 180 181 /* 182 * Read the sysctl name 183 */ 184 if ((error = copyin(NETBSD32PTR64(ls32.name), &name, 185 ls32.nlen * sizeof(int))) != 0) 186 return error; 187 188 ktrmib(name, ls32.nlen); 189 /* 190 * First try linux32 tree, then linux tree 191 */ 192 oldlen = (size_t)oldlen32; 193 sysctl_lock(NETBSD32PTR64(ls32.newval) != NULL); 194 error = sysctl_dispatch(name, ls32.nlen, 195 NETBSD32PTR64(ls32.oldval), &oldlen, 196 NETBSD32PTR64(ls32.newval), ls32.newlen, 197 name, l, &linux32_sysctl_root); 198 oldlen32 = (netbsd32_size_t)oldlen; 199 sysctl_unlock(); 200 201 /* 202 * Check for oldlen overflow (not likely, but who knows...) 203 */ 204 if (oldlen != oldlen32) { 205 #ifdef DEBUG_LINUX 206 printf("%s: oldlen32 = %d, oldlen = %ld\n", 207 __func__, oldlen32, oldlen); 208 #endif 209 return EINVAL; 210 } 211 212 /* 213 * set caller's oldlen, even if we got an error 214 */ 215 if (NETBSD32PTR64(ls32.oldlenp)) { 216 int nerror; 217 218 nerror = copyout(&oldlen32, 219 NETBSD32PTR64(ls32.oldlenp), sizeof(oldlen32)); 220 221 if (error == 0) 222 error = nerror; 223 } 224 225 /* 226 * oldlen was too short 227 */ 228 if ((error == 0) && 229 (NETBSD32PTR64(ls32.oldval) != NULL) && 230 (savelen < oldlen32)) 231 error = ENOMEM; 232 233 return error; 234 } 235