svr4_sysvec.c

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    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 
   69 int 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 
  157 static int      svr4_fixup(register_t **stack_base, struct image_params *imgp);
  158 
  159 extern struct sysent svr4_sysent[];
  160 #undef szsigcode
  161 #undef sigcode
  162 
  163 extern int svr4_szsigcode;
  164 extern char svr4_sigcode[];
  165 
  166 struct 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 
  201 const char      svr4_emul_path[] = "/compat/svr4";
  202 
  203 Elf32_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 
  215 static int
  216 svr4_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  */
  257 int
  258 svr4_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 
  266 static int
  267 svr4_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 
  308 static moduledata_t svr4_elf_mod = {
  309         "svr4elf",
  310         svr4_elf_modevent,
  311         0
  312 };
  313 DECLARE_MODULE_TIED(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
  314 MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
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FreeBSD/Linux Kernel Cross Reference sys/compat/svr4/svr4_sysvec.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/svr4/svr4_sysvec.c
