1 /* $NetBSD: linux32_sysctl.c,v 1.19 2020/03/21 16:28:56 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 1.19 2020/03/21 16:28:56 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 /* 74 * We need our own sysctllog here because we deal with two 75 * separate sysctl trees; each clog is restricted to a 76 * single tree. 77 */ 78 79 static struct sysctllog *linux32_clog; 80 81 void 82 linux32_sysctl_fini(void) 83 { 84 85 sysctl_teardown(&linux32_clog); 86 sysctl_free(&linux32_sysctl_root); 87 } 88 89 SYSCTL_SETUP(linux32_sysctl_init, "linux32 emulation sysctls") 90 { 91 const struct sysctlnode *node = &linux32_sysctl_root; 92 93 sysctl_createv(clog, 0, NULL, NULL, 94 CTLFLAG_PERMANENT, 95 CTLTYPE_NODE, "linux32", 96 SYSCTL_DESCR("Linux 32 bit emulation settings"), 97 NULL, 0, NULL, 0, 98 CTL_EMUL, EMUL_LINUX32, CTL_EOL); 99 sysctl_createv(clog, 0, NULL, NULL, 100 CTLFLAG_PERMANENT, 101 CTLTYPE_NODE, "kern", 102 SYSCTL_DESCR("Linux 32 bit kernel emulation settings"), 103 NULL, 0, NULL, 0, 104 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, CTL_EOL); 105 106 sysctl_createv(clog, 0, NULL, NULL, 107 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 108 CTLTYPE_STRING, "ostype", 109 SYSCTL_DESCR("Linux 32 bit operating system type"), 110 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 111 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 112 EMUL_LINUX32_KERN_OSTYPE, CTL_EOL); 113 sysctl_createv(clog, 0, NULL, NULL, 114 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 115 CTLTYPE_STRING, "osrelease", 116 SYSCTL_DESCR("Linux 32 bit operating system release"), 117 NULL, 0, linux32_release, sizeof(linux32_release), 118 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 119 EMUL_LINUX32_KERN_OSRELEASE, CTL_EOL); 120 sysctl_createv(clog, 0, NULL, NULL, 121 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 122 CTLTYPE_STRING, "osversion", 123 SYSCTL_DESCR("Linux 32 bit operating system revision"), 124 NULL, 0, linux32_version, sizeof(linux32_version), 125 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, 126 EMUL_LINUX32_KERN_VERSION, CTL_EOL); 127 sysctl_createv(clog, 0, NULL, NULL, 128 CTLFLAG_READWRITE, 129 CTLTYPE_INT, "enabled", 130 SYSCTL_DESCR("Linux 32 bit compat enabled."), 131 linux32_sysctl_enable, 0, &linux32_enabled, 0, 132 CTL_EMUL, EMUL_LINUX32, CTL_CREATE, CTL_EOL); 133 134 sysctl_createv(&linux32_clog, 0, &node, &node, 135 CTLFLAG_PERMANENT, 136 CTLTYPE_NODE, "kern", NULL, 137 NULL, 0, NULL, 0, 138 LINUX_CTL_KERN, CTL_EOL); 139 140 sysctl_createv(&linux32_clog, 0, &node, NULL, 141 CTLFLAG_PERMANENT, 142 CTLTYPE_STRING, "ostype", NULL, 143 NULL, 0, linux32_sysname, sizeof(linux32_sysname), 144 LINUX_KERN_OSTYPE, CTL_EOL); 145 sysctl_createv(&linux32_clog, 0, &node, NULL, 146 CTLFLAG_PERMANENT, 147 CTLTYPE_STRING, "osrelease", NULL, 148 NULL, 0, linux32_release, sizeof(linux32_release), 149 LINUX_KERN_OSRELEASE, CTL_EOL); 150 sysctl_createv(&linux32_clog, 0, &node, NULL, 151 CTLFLAG_PERMANENT, 152 CTLTYPE_STRING, "version", NULL, 153 NULL, 0, linux32_version, sizeof(linux32_version), 154 LINUX_KERN_VERSION, CTL_EOL); 155 156 linux32_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 157 } 158 159 int 160 linux32_sys___sysctl(struct lwp *l, const struct linux32_sys___sysctl_args *uap, register_t *retval) 161 { 162 /* { 163 syscallarg(linux32___sysctlp_t) lsp; 164 } */ 165 struct linux32_sysctl ls32; 166 int name[CTL_MAXNAME]; 167 size_t savelen; 168 netbsd32_size_t oldlen32; 169 size_t oldlen; 170 int error; 171 172 /* 173 * Read sysctl arguments 174 */ 175 if ((error = copyin(SCARG_P32(uap, lsp), &ls32, sizeof(ls32))) != 0) 176 return error; 177 178 /* 179 * Read oldlen 180 */ 181 if (NETBSD32PTR64(ls32.oldlenp) != NULL) { 182 if ((error = copyin(NETBSD32PTR64(ls32.oldlenp), 183 &oldlen32, sizeof(oldlen32))) != 0) 184 return error; 185 } else { 186 oldlen32 = 0; 187 } 188 189 savelen = (size_t)oldlen32; 190 191 /* 192 * Sanity check nlen 193 */ 194 if ((ls32.nlen > CTL_MAXNAME) || (ls32.nlen < 1)) 195 return ENOTDIR; 196 197 /* 198 * Read the sysctl name 199 */ 200 if ((error = copyin(NETBSD32PTR64(ls32.name), &name, 201 ls32.nlen * sizeof(int))) != 0) 202 return error; 203 204 ktrmib(name, ls32.nlen); 205 /* 206 * First try linux32 tree, then linux tree 207 */ 208 oldlen = (size_t)oldlen32; 209 sysctl_lock(NETBSD32PTR64(ls32.newval) != NULL); 210 error = sysctl_dispatch(name, ls32.nlen, 211 NETBSD32PTR64(ls32.oldval), &oldlen, 212 NETBSD32PTR64(ls32.newval), ls32.newlen, 213 name, l, &linux32_sysctl_root); 214 oldlen32 = (netbsd32_size_t)oldlen; 215 sysctl_unlock(); 216 217 /* 218 * Check for oldlen overflow (not likely, but who knows...) 219 */ 220 if (oldlen != oldlen32) { 221 #ifdef DEBUG_LINUX 222 printf("%s: oldlen32 = %d, oldlen = %ld\n", 223 __func__, oldlen32, oldlen); 224 #endif 225 return EINVAL; 226 } 227 228 /* 229 * set caller's oldlen, even if we got an error 230 */ 231 if (NETBSD32PTR64(ls32.oldlenp)) { 232 int nerror; 233 234 nerror = copyout(&oldlen32, 235 NETBSD32PTR64(ls32.oldlenp), sizeof(oldlen32)); 236 237 if (error == 0) 238 error = nerror; 239 } 240 241 /* 242 * oldlen was too short 243 */ 244 if ((error == 0) && 245 (NETBSD32PTR64(ls32.oldval) != NULL) && 246 (savelen < oldlen32)) 247 error = ENOMEM; 248 249 return error; 250 } 251
Indexes created Wed Sep 24 15:09:51 GMT 2025