The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/alpha/linux/linux_sysvec.c

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    1 /*-
    2  * Copyright (c) 1994-1996 Søren Schmidt
    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  *    in this position and unchanged.
   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. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/5.4/sys/alpha/linux/linux_sysvec.c 132199 2004-07-15 08:26:07Z phk $");
   31 
   32 /* XXX we use functions that might not exist. */
   33 #include "opt_compat.h"
   34 
   35 #ifndef COMPAT_43
   36 #error "Unable to compile Linux-emulator due to missing COMPAT_43 option!"
   37 #endif
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/exec.h>
   42 #include <sys/imgact.h>
   43 #include <sys/imgact_aout.h>
   44 #include <sys/imgact_elf.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/malloc.h>
   48 #include <sys/module.h>
   49 #include <sys/mutex.h>
   50 #include <sys/proc.h>
   51 #include <sys/signalvar.h>
   52 #include <sys/sysent.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/vm_param.h>
   56 #include <vm/vm_page.h>
   57 #include <vm/vm_extern.h>
   58 
   59 #include <machine/cpu.h>
   60 #include <machine/md_var.h>
   61 
   62 #include <alpha/linux/linux.h>
   63 #include <alpha/linux/linux_proto.h>
   64 #include <compat/linux/linux_mib.h>
   65 #include <compat/linux/linux_util.h>
   66 #undef szsigcode
   67 
   68 MODULE_VERSION(linux, 1);
   69 MODULE_DEPEND(linux, osf1, 1, 1, 1);
   70 MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
   71 MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
   72 MODULE_DEPEND(linux, sysvshm, 1, 1, 1);
   73 
   74 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
   75 
   76 #if BYTE_ORDER == LITTLE_ENDIAN
   77 #define SHELLMAGIC      0x2123 /* #! */
   78 #else
   79 #define SHELLMAGIC      0x2321
   80 #endif
   81 
   82 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
   83 
   84 void osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code);
   85 
   86 static int      elf_linux_fixup(register_t **stack_base,
   87     struct image_params *iparams);
   88 static int      exec_linux_imgact_try(struct image_params *iparams);
   89 
   90 static int
   91 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
   92 {
   93         Elf64_Auxargs *args;
   94         register_t *pos;
   95 
   96         KASSERT(curthread->td_proc == imgp->proc &&
   97             (curthread->td_proc->p_flag & P_SA) == 0,
   98             ("unsafe elf_linux_fixup(), should be curproc"));
   99         args = (Elf64_Auxargs *)imgp->auxargs;
  100         pos = *stack_base + (imgp->argc + imgp->envc + 2);
  101 
  102         if (args->trace)
  103                 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
  104         if (args->execfd != -1)
  105                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
  106         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
  107         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
  108         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
  109         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
  110         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
  111         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
  112         AUXARGS_ENTRY(pos, AT_BASE, args->base);
  113         AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
  114         AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
  115         AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
  116         AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
  117         AUXARGS_ENTRY(pos, AT_NULL, 0);
  118         
  119         free(imgp->auxargs, M_TEMP);      
  120         imgp->auxargs = NULL;
  121 
  122         (*stack_base)--;
  123         **stack_base = (register_t)imgp->argc;
  124         return 0;
  125 }
  126 
  127 /*
  128  * If a linux binary is exec'ing something, try this image activator 
  129  * first.  We override standard shell script execution in order to
  130  * be able to modify the interpreter path.  We only do this if a linux
  131  * binary is doing the exec, so we do not create an EXEC module for it.
  132  */
  133 static int
  134 exec_linux_imgact_try(imgp)
  135         struct image_params *imgp;
  136 {
  137         const char *head;
  138         int error;
  139 
  140         head = (const char *)imgp->image_header;
  141         error = -1;
  142 
  143         /*
  144          * The interpreter for shell scripts run from a linux binary needs
  145          * to be located in /compat/linux if possible in order to recursively
  146          * maintain linux path emulation.
  147          */
  148         if (((const short *)head)[0] == SHELLMAGIC) {
  149                 /*
  150                  * Run our normal shell image activator.  If it succeeds
  151                  * attempt to use the alternate path for the interpreter.  If
  152                  * an alternate path is found, use our stringspace to store it.
  153                  */
  154                 if ((error = exec_shell_imgact(imgp)) == 0) {
  155                         char *rpath = NULL;
  156 
  157                         linux_emul_find(FIRST_THREAD_IN_PROC(imgp->proc), NULL,
  158                             imgp->interpreter_name, &rpath, 0);
  159                         if (rpath != imgp->interpreter_name) {
  160                                 int len = strlen(rpath) + 1;
  161 
  162                                 if (len <= MAXSHELLCMDLEN) {
  163                                         memcpy(imgp->interpreter_name, rpath,
  164                                             len);
  165                                 }
  166                                 free(rpath, M_TEMP);
  167                         }
  168                 }
  169         }
  170         return(error);
  171 }
  172 
  173 /*
  174  * To maintain OSF/1 compat, linux uses BSD signals & errnos on their
  175  * alpha port.  This greatly simplfies things for us.
  176  */
  177 
  178 struct sysentvec elf_linux_sysvec = {
  179         LINUX_SYS_MAXSYSCALL,
  180         linux_sysent,
  181         0,
  182         0,
  183         NULL,
  184         0,
  185         NULL,
  186         NULL,
  187         elf_linux_fixup,
  188         osendsig,
  189         linux_sigcode,
  190         &linux_szsigcode,
  191         NULL,
  192         "Linux ELF",
  193         elf64_coredump,
  194         exec_linux_imgact_try,
  195         LINUX_MINSIGSTKSZ,
  196         PAGE_SIZE,
  197         VM_MIN_ADDRESS,
  198         VM_MAXUSER_ADDRESS,
  199         USRSTACK,
  200         PS_STRINGS,
  201         VM_PROT_ALL,
  202         exec_copyout_strings,
  203         exec_setregs,
  204         NULL
  205 };
  206 
  207 static Elf64_Brandinfo linux_brand = {
  208                                         ELFOSABI_LINUX,
  209                                         EM_ALPHA,
  210                                         "Linux",
  211                                         "/compat/linux",
  212                                         "/lib/ld-linux.so.1",
  213                                         &elf_linux_sysvec,
  214                                         NULL,
  215                                  };
  216 
  217 static Elf64_Brandinfo linux_glibc2brand = {
  218                                         ELFOSABI_LINUX,
  219                                         EM_ALPHA,
  220                                         "Linux",
  221                                         "/compat/linux",
  222                                         "/lib/ld-linux.so.2",
  223                                         &elf_linux_sysvec,
  224                                         NULL,
  225                                  };
  226 
  227 Elf64_Brandinfo *linux_brandlist[] = {
  228                                         &linux_brand,
  229                                         &linux_glibc2brand,
  230                                         NULL
  231                                 };
  232 
  233 static int
  234 linux_elf_modevent(module_t mod, int type, void *data)
  235 {
  236         Elf64_Brandinfo **brandinfo;
  237         int error;
  238         struct linux_ioctl_handler **lihp;
  239 
  240         error = 0;
  241 
  242         switch(type) {
  243         case MOD_LOAD:
  244                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
  245                     ++brandinfo)
  246                         if (elf64_insert_brand_entry(*brandinfo) < 0)
  247                                 error = EINVAL;
  248                 if (error == 0) {
  249                         SET_FOREACH(lihp, linux_ioctl_handler_set)
  250                                 linux_ioctl_register_handler(*lihp);
  251                         if (bootverbose)
  252                                 printf("Linux ELF exec handler installed\n");
  253                 } else
  254                         printf("cannot insert Linux ELF brand handler\n");
  255                 break;
  256         case MOD_UNLOAD:
  257                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
  258                     ++brandinfo)
  259                         if (elf64_brand_inuse(*brandinfo))
  260                                 error = EBUSY;
  261                 if (error == 0) {
  262                         for (brandinfo = &linux_brandlist[0];
  263                             *brandinfo != NULL; ++brandinfo)
  264                                 if (elf64_remove_brand_entry(*brandinfo) < 0)
  265                                         error = EINVAL;
  266                 }
  267                 if (error == 0) {
  268                         SET_FOREACH(lihp, linux_ioctl_handler_set)
  269                                 linux_ioctl_unregister_handler(*lihp);
  270                         if (bootverbose)
  271                                 printf("Linux ELF exec handler removed\n");
  272                         linux_mib_destroy();
  273                 } else
  274                         printf("Could not deinstall ELF interpreter entry\n");
  275                 break;
  276         default:
  277                 return (EOPNOTSUPP);
  278                 break;
  279         }
  280         return error;
  281 }
  282 
  283 static moduledata_t linux_elf_mod = {
  284         "linuxelf",
  285         linux_elf_modevent,
  286         0
  287 };
  288 
  289 DUMMY(rt_sigreturn);
  290 
  291 DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);

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