cloudabi64_module.c

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    1 /*-
    2  * Copyright (c) 2015 Nuxi, https://nuxi.nl/
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/11.2/sys/compat/cloudabi64/cloudabi64_module.c 325858 2017-11-15 15:56:08Z ed $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/imgact.h>
   31 #include <sys/kernel.h>
   32 #include <sys/module.h>
   33 #include <sys/proc.h>
   34 #include <sys/smp.h>
   35 #include <sys/sysctl.h>
   36 #include <sys/sysent.h>
   37 #include <sys/systm.h>
   38 
   39 #include <contrib/cloudabi/cloudabi64_types.h>
   40 
   41 #include <compat/cloudabi/cloudabi_util.h>
   42 
   43 #include <compat/cloudabi64/cloudabi64_util.h>
   44 
   45 extern char _binary_cloudabi64_vdso_o_start[];
   46 extern char _binary_cloudabi64_vdso_o_end[];
   47 
   48 register_t *
   49 cloudabi64_copyout_strings(struct image_params *imgp)
   50 {
   51         struct image_args *args;
   52         uintptr_t begin;
   53         size_t len;
   54 
   55         /* Copy out program arguments. */
   56         args = imgp->args;
   57         len = args->begin_envv - args->begin_argv;
   58         begin = rounddown2(imgp->sysent->sv_usrstack - len, sizeof(register_t));
   59         copyout(args->begin_argv, (void *)begin, len);
   60         return ((register_t *)begin);
   61 }
   62 
   63 int
   64 cloudabi64_fixup(register_t **stack_base, struct image_params *imgp)
   65 {
   66         char canarybuf[64], pidbuf[16];
   67         Elf64_Auxargs *args;
   68         struct thread *td;
   69         void *argdata, *canary, *pid;
   70         size_t argdatalen;
   71         int error;
   72 
   73         /*
   74          * CloudABI executables do not store the FreeBSD OS release
   75          * number in their header. Set the OS release number to the
   76          * latest version of FreeBSD, so that system calls behave as if
   77          * called natively.
   78          */
   79         td = curthread;
   80         td->td_proc->p_osrel = __FreeBSD_version;
   81 
   82         argdata = *stack_base;
   83 
   84         /* Store canary for stack smashing protection. */
   85         arc4rand(canarybuf, sizeof(canarybuf), 0);
   86         *stack_base -= howmany(sizeof(canarybuf), sizeof(register_t));
   87         canary = *stack_base;
   88         error = copyout(canarybuf, canary, sizeof(canarybuf));
   89         if (error != 0)
   90                 return (error);
   91 
   92         /*
   93          * Generate a random UUID that identifies the process. Right now
   94          * we don't store this UUID in the kernel. Ideally, it should be
   95          * exposed through ps(1).
   96          */
   97         arc4rand(pidbuf, sizeof(pidbuf), 0);
   98         pidbuf[6] = (pidbuf[6] & 0x0f) | 0x40;
   99         pidbuf[8] = (pidbuf[8] & 0x3f) | 0x80;
  100         *stack_base -= howmany(sizeof(pidbuf), sizeof(register_t));
  101         pid = *stack_base;
  102         error = copyout(pidbuf, pid, sizeof(pidbuf));
  103         if (error != 0)
  104                 return (error);
  105 
  106         /*
  107          * Compute length of program arguments. As the argument data is
  108          * binary safe, we had to add a trailing null byte in
  109          * exec_copyin_data_fds(). Undo this by reducing the length.
  110          */
  111         args = (Elf64_Auxargs *)imgp->auxargs;
  112         argdatalen = imgp->args->begin_envv - imgp->args->begin_argv;
  113         if (argdatalen > 0)
  114                 --argdatalen;
  115 
  116         /* Write out an auxiliary vector. */
  117         cloudabi64_auxv_t auxv[] = {
  118 #define VAL(type, val)  { .a_type = (type), .a_val = (val) }
  119 #define PTR(type, ptr)  { .a_type = (type), .a_ptr = (uintptr_t)(ptr) }
  120                 PTR(CLOUDABI_AT_ARGDATA, argdata),
  121                 VAL(CLOUDABI_AT_ARGDATALEN, argdatalen),
  122                 VAL(CLOUDABI_AT_BASE, args->base),
  123                 PTR(CLOUDABI_AT_CANARY, canary),
  124                 VAL(CLOUDABI_AT_CANARYLEN, sizeof(canarybuf)),
  125                 VAL(CLOUDABI_AT_NCPUS, mp_ncpus),
  126                 VAL(CLOUDABI_AT_PAGESZ, args->pagesz),
  127                 PTR(CLOUDABI_AT_PHDR, args->phdr),
  128                 VAL(CLOUDABI_AT_PHNUM, args->phnum),
  129                 PTR(CLOUDABI_AT_PID, pid),
  130                 PTR(CLOUDABI_AT_SYSINFO_EHDR,
  131                     imgp->proc->p_sysent->sv_shared_page_base),
  132                 VAL(CLOUDABI_AT_TID, td->td_tid),
  133 #undef VAL
  134 #undef PTR
  135                 { .a_type = CLOUDABI_AT_NULL },
  136         };
  137         *stack_base -= howmany(sizeof(auxv), sizeof(register_t));
  138         error = copyout(auxv, *stack_base, sizeof(auxv));
  139         if (error != 0)
  140                 return (error);
  141 
  142         /* Reserve space for storing the TCB. */
  143         *stack_base -= howmany(sizeof(cloudabi64_tcb_t), sizeof(register_t));
  144         return (0);
  145 }
  146 
  147 static int
  148 cloudabi64_modevent(module_t mod, int type, void *data)
  149 {
  150 
  151         switch (type) {
  152         case MOD_LOAD:
  153                 cloudabi_vdso_init(cloudabi64_brand.sysvec,
  154                     _binary_cloudabi64_vdso_o_start,
  155                     _binary_cloudabi64_vdso_o_end);
  156                 if (elf64_insert_brand_entry(&cloudabi64_brand) < 0) {
  157                         printf("Failed to add CloudABI ELF brand handler\n");
  158                         return (EINVAL);
  159                 }
  160                 return (0);
  161         case MOD_UNLOAD:
  162                 if (elf64_brand_inuse(&cloudabi64_brand))
  163                         return (EBUSY);
  164                 if (elf64_remove_brand_entry(&cloudabi64_brand) < 0) {
  165                         printf("Failed to remove CloudABI ELF brand handler\n");
  166                         return (EINVAL);
  167                 }
  168                 cloudabi_vdso_destroy(cloudabi64_brand.sysvec);
  169                 return (0);
  170         default:
  171                 return (EOPNOTSUPP);
  172         }
  173 }
  174 
  175 static moduledata_t cloudabi64_module = {
  176         "cloudabi64",
  177         cloudabi64_modevent,
  178         NULL
  179 };
  180 
  181 DECLARE_MODULE_TIED(cloudabi64, cloudabi64_module, SI_SUB_EXEC, SI_ORDER_ANY);
  182 MODULE_DEPEND(cloudabi64, cloudabi, 1, 1, 1);
  183 FEATURE(cloudabi64, "CloudABI 64bit support");

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FreeBSD/Linux Kernel Cross Reference sys/compat/cloudabi64/cloudabi64_module.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/cloudabi64/cloudabi64_module.c