1/*- 2 * Copyright (c) 1998 Mark Newton 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Christos Zoulas. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD$"); 33 34/* XXX we use functions that might not exist. */ 35#include "opt_compat.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/proc.h> 40#include <sys/sysent.h> 41#include <sys/imgact.h> 42#include <sys/imgact_elf.h> 43#include <sys/fcntl.h> 44#include <sys/lock.h> 45#include <sys/malloc.h> 46#include <sys/module.h> 47#include <sys/mutex.h> 48#include <sys/namei.h> 49#include <sys/socket.h> 50#include <sys/syscallsubr.h> 51#include <sys/vnode.h> 52#include <vm/vm.h> 53#include <sys/exec.h> 54#include <sys/kernel.h> 55#include <machine/cpu.h> 56#include <netinet/in.h> 57 58#include <compat/svr4/svr4.h> 59#include <compat/svr4/svr4_types.h> 60#include <compat/svr4/svr4_syscall.h> 61#include <compat/svr4/svr4_signal.h> 62#include <compat/svr4/svr4_socket.h> 63#include <compat/svr4/svr4_sockio.h> 64#include <compat/svr4/svr4_errno.h> 65#include <compat/svr4/svr4_proto.h> 66#include <compat/svr4/svr4_siginfo.h> 67#include <compat/svr4/svr4_util.h> 68 69int bsd_to_svr4_errno[ELAST+1] = { 70 0, 71 SVR4_EPERM, 72 SVR4_ENOENT, 73 SVR4_ESRCH, 74 SVR4_EINTR, 75 SVR4_EIO, 76 SVR4_ENXIO, 77 SVR4_E2BIG, 78 SVR4_ENOEXEC, 79 SVR4_EBADF, 80 SVR4_ECHILD, 81 SVR4_EDEADLK, 82 SVR4_ENOMEM, 83 SVR4_EACCES, 84 SVR4_EFAULT, 85 SVR4_ENOTBLK, 86 SVR4_EBUSY, 87 SVR4_EEXIST, 88 SVR4_EXDEV, 89 SVR4_ENODEV, 90 SVR4_ENOTDIR, 91 SVR4_EISDIR, 92 SVR4_EINVAL, 93 SVR4_ENFILE, 94 SVR4_EMFILE, 95 SVR4_ENOTTY, 96 SVR4_ETXTBSY, 97 SVR4_EFBIG, 98 SVR4_ENOSPC, 99 SVR4_ESPIPE, 100 SVR4_EROFS, 101 SVR4_EMLINK, 102 SVR4_EPIPE, 103 SVR4_EDOM, 104 SVR4_ERANGE, 105 SVR4_EAGAIN, 106 SVR4_EINPROGRESS, 107 SVR4_EALREADY, 108 SVR4_ENOTSOCK, 109 SVR4_EDESTADDRREQ, 110 SVR4_EMSGSIZE, 111 SVR4_EPROTOTYPE, 112 SVR4_ENOPROTOOPT, 113 SVR4_EPROTONOSUPPORT, 114 SVR4_ESOCKTNOSUPPORT, 115 SVR4_EOPNOTSUPP, 116 SVR4_EPFNOSUPPORT, 117 SVR4_EAFNOSUPPORT, 118 SVR4_EADDRINUSE, 119 SVR4_EADDRNOTAVAIL, 120 SVR4_ENETDOWN, 121 SVR4_ENETUNREACH, 122 SVR4_ENETRESET, 123 SVR4_ECONNABORTED, 124 SVR4_ECONNRESET, 125 SVR4_ENOBUFS, 126 SVR4_EISCONN, 127 SVR4_ENOTCONN, 128 SVR4_ESHUTDOWN, 129 SVR4_ETOOMANYREFS, 130 SVR4_ETIMEDOUT, 131 SVR4_ECONNREFUSED, 132 SVR4_ELOOP, 133 SVR4_ENAMETOOLONG, 134 SVR4_EHOSTDOWN, 135 SVR4_EHOSTUNREACH, 136 SVR4_ENOTEMPTY, 137 SVR4_EPROCLIM, 138 SVR4_EUSERS, 139 SVR4_EDQUOT, 140 SVR4_ESTALE, 141 SVR4_EREMOTE, 142 SVR4_EBADRPC, 143 SVR4_ERPCMISMATCH, 144 SVR4_EPROGUNAVAIL, 145 SVR4_EPROGMISMATCH, 146 SVR4_EPROCUNAVAIL, 147 SVR4_ENOLCK, 148 SVR4_ENOSYS, 149 SVR4_EFTYPE, 150 SVR4_EAUTH, 151 SVR4_ENEEDAUTH, 152 SVR4_EIDRM, 153 SVR4_ENOMSG, 154}; 155 156 157static int svr4_fixup(register_t **stack_base, struct image_params *imgp); 158 159extern struct sysent svr4_sysent[]; 160#undef szsigcode 161#undef sigcode 162 163extern int svr4_szsigcode; 164extern char svr4_sigcode[]; 165 166struct sysentvec svr4_sysvec = { 167 .sv_size = SVR4_SYS_MAXSYSCALL, 168 .sv_table = svr4_sysent, 169 .sv_mask = 0xff, 170 .sv_sigsize = SVR4_NSIG-1, /* NB: signal trans table indexed with signno-1 */ 171 .sv_sigtbl = bsd_to_svr4_sig+1, 172 .sv_errsize = ELAST, /* ELAST */ 173 .sv_errtbl = bsd_to_svr4_errno, 174 .sv_transtrap = NULL, 175 .sv_fixup = svr4_fixup, 176 .sv_sendsig = svr4_sendsig, 177 .sv_sigcode = svr4_sigcode, 178 .sv_szsigcode = &svr4_szsigcode, 179 .sv_prepsyscall = NULL, 180 .sv_name = "SVR4", 181 .sv_coredump = elf32_coredump, 182 .sv_imgact_try = NULL, 183 .sv_minsigstksz = SVR4_MINSIGSTKSZ, 184 .sv_pagesize = PAGE_SIZE, 185 .sv_minuser = VM_MIN_ADDRESS, 186 .sv_maxuser = VM_MAXUSER_ADDRESS, 187 .sv_usrstack = USRSTACK, 188 .sv_psstrings = PS_STRINGS, 189 .sv_stackprot = VM_PROT_ALL, 190 .sv_copyout_strings = exec_copyout_strings, 191 .sv_setregs = exec_setregs, 192 .sv_fixlimit = NULL, 193 .sv_maxssiz = NULL, 194 .sv_flags = SV_ABI_UNDEF | SV_IA32 | SV_ILP32, 195 .sv_set_syscall_retval = cpu_set_syscall_retval, 196 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 197 .sv_syscallnames = NULL, 198 .sv_schedtail = NULL, 199}; 200 201const char svr4_emul_path[] = "/compat/svr4"; 202 203Elf32_Brandinfo svr4_brand = { 204 .brand = ELFOSABI_SYSV, 205 .machine = EM_386, /* XXX only implemented for x86 so far. */ 206 .compat_3_brand = "SVR4", 207 .emul_path = svr4_emul_path, 208 .interp_path = "/lib/libc.so.1", 209 .sysvec = &svr4_sysvec, 210 .interp_newpath = NULL, 211 .brand_note = NULL, 212 .flags = 0 213}; 214 215static int 216svr4_fixup(register_t **stack_base, struct image_params *imgp) 217{ 218 Elf32_Auxargs *args; 219 register_t *pos; 220 221 KASSERT(curthread->td_proc == imgp->proc, 222 ("unsafe svr4_fixup(), should be curproc")); 223 args = (Elf32_Auxargs *)imgp->auxargs; 224 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 225 226 if (args->execfd != -1) 227 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 228 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 229 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 230 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 231 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 232 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 233 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 234 AUXARGS_ENTRY(pos, AT_BASE, args->base); 235 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 236 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 237 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 238 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 239 AUXARGS_ENTRY(pos, AT_NULL, 0); 240 241 free(imgp->auxargs, M_TEMP); 242 imgp->auxargs = NULL; 243 244 (*stack_base)--; 245 **stack_base = (register_t)imgp->args->argc; 246 return 0; 247} 248 249/* 250 * Search an alternate path before passing pathname arguments on 251 * to system calls. Useful for keeping a separate 'emulation tree'. 252 * 253 * If cflag is set, we check if an attempt can be made to create 254 * the named file, i.e. we check if the directory it should 255 * be in exists. 256 */ 257int 258svr4_emul_find(struct thread *td, char *path, enum uio_seg pathseg, 259 char **pbuf, int create) 260{ 261 262 return (kern_alternate_path(td, svr4_emul_path, path, pathseg, pbuf, 263 create, AT_FDCWD)); 264} 265 266static int 267svr4_elf_modevent(module_t mod, int type, void *data) 268{ 269 int error; 270 271 error = 0; 272 273 switch(type) { 274 case MOD_LOAD: 275 if (elf32_insert_brand_entry(&svr4_brand) < 0) { 276 printf("cannot insert svr4 elf brand handler\n"); 277 error = EINVAL; 278 break; 279 } 280 if (bootverbose) 281 printf("svr4 ELF exec handler installed\n"); 282 svr4_sockcache_init(); 283 break; 284 case MOD_UNLOAD: 285 /* Only allow the emulator to be removed if it isn't in use. */ 286 if (elf32_brand_inuse(&svr4_brand) != 0) { 287 error = EBUSY; 288 } else if (elf32_remove_brand_entry(&svr4_brand) < 0) { 289 error = EINVAL; 290 } 291 292 if (error) { 293 printf("Could not deinstall ELF interpreter entry (error %d)\n", 294 error); 295 break; 296 } 297 if (bootverbose) 298 printf("svr4 ELF exec handler removed\n"); 299 svr4_sockcache_destroy(); 300 break; 301 default: 302 return (EOPNOTSUPP); 303 break; 304 } 305 return error; 306} 307 308static moduledata_t svr4_elf_mod = { 309 "svr4elf", 310 svr4_elf_modevent, 311 0 312}; 313DECLARE_MODULE_TIED(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 314MODULE_DEPEND(svr4elf, streams, 1, 1, 1); 315