The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_misc.c

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    1 /*-
    2  * Copyright (c) 2002 Doug Rabson
    3  * Copyright (c) 1994-1995 Søren Schmidt
    4  * 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  *    in this position and unchanged.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/8.0/sys/compat/linux/linux_misc.c 197255 2009-09-16 13:24:37Z kib $");
   32 
   33 #include "opt_compat.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/blist.h>
   37 #include <sys/fcntl.h>
   38 #if defined(__i386__)
   39 #include <sys/imgact_aout.h>
   40 #endif
   41 #include <sys/jail.h>
   42 #include <sys/kernel.h>
   43 #include <sys/limits.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mman.h>
   47 #include <sys/mount.h>
   48 #include <sys/mutex.h>
   49 #include <sys/namei.h>
   50 #include <sys/priv.h>
   51 #include <sys/proc.h>
   52 #include <sys/reboot.h>
   53 #include <sys/resourcevar.h>
   54 #include <sys/sched.h>
   55 #include <sys/signalvar.h>
   56 #include <sys/stat.h>
   57 #include <sys/syscallsubr.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/sysproto.h>
   60 #include <sys/systm.h>
   61 #include <sys/time.h>
   62 #include <sys/vmmeter.h>
   63 #include <sys/vnode.h>
   64 #include <sys/wait.h>
   65 #include <sys/cpuset.h>
   66 
   67 #include <security/mac/mac_framework.h>
   68 
   69 #include <vm/vm.h>
   70 #include <vm/pmap.h>
   71 #include <vm/vm_kern.h>
   72 #include <vm/vm_map.h>
   73 #include <vm/vm_extern.h>
   74 #include <vm/vm_object.h>
   75 #include <vm/swap_pager.h>
   76 
   77 #ifdef COMPAT_LINUX32
   78 #include <machine/../linux32/linux.h>
   79 #include <machine/../linux32/linux32_proto.h>
   80 #else
   81 #include <machine/../linux/linux.h>
   82 #include <machine/../linux/linux_proto.h>
   83 #endif
   84 
   85 #include <compat/linux/linux_file.h>
   86 #include <compat/linux/linux_mib.h>
   87 #include <compat/linux/linux_signal.h>
   88 #include <compat/linux/linux_util.h>
   89 #include <compat/linux/linux_sysproto.h>
   90 #include <compat/linux/linux_emul.h>
   91 #include <compat/linux/linux_misc.h>
   92 
   93 int stclohz;                            /* Statistics clock frequency */
   94 
   95 #define BSD_TO_LINUX_SIGNAL(sig)        \
   96         (((sig) <= LINUX_SIGTBLSZ) ? bsd_to_linux_signal[_SIG_IDX(sig)] : sig)
   97 
   98 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
   99         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
  100         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE,
  101         RLIMIT_MEMLOCK, RLIMIT_AS 
  102 };
  103 
  104 struct l_sysinfo {
  105         l_long          uptime;         /* Seconds since boot */
  106         l_ulong         loads[3];       /* 1, 5, and 15 minute load averages */
  107 #define LINUX_SYSINFO_LOADS_SCALE 65536
  108         l_ulong         totalram;       /* Total usable main memory size */
  109         l_ulong         freeram;        /* Available memory size */
  110         l_ulong         sharedram;      /* Amount of shared memory */
  111         l_ulong         bufferram;      /* Memory used by buffers */
  112         l_ulong         totalswap;      /* Total swap space size */
  113         l_ulong         freeswap;       /* swap space still available */
  114         l_ushort        procs;          /* Number of current processes */
  115         l_ushort        pads;
  116         l_ulong         totalbig;
  117         l_ulong         freebig;
  118         l_uint          mem_unit;
  119         char            _f[20-2*sizeof(l_long)-sizeof(l_int)];  /* padding */
  120 };
  121 int
  122 linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
  123 {
  124         struct l_sysinfo sysinfo;
  125         vm_object_t object;
  126         int i, j;
  127         struct timespec ts;
  128 
  129         getnanouptime(&ts);
  130         if (ts.tv_nsec != 0)
  131                 ts.tv_sec++;
  132         sysinfo.uptime = ts.tv_sec;
  133 
  134         /* Use the information from the mib to get our load averages */
  135         for (i = 0; i < 3; i++)
  136                 sysinfo.loads[i] = averunnable.ldavg[i] *
  137                     LINUX_SYSINFO_LOADS_SCALE / averunnable.fscale;
  138 
  139         sysinfo.totalram = physmem * PAGE_SIZE;
  140         sysinfo.freeram = sysinfo.totalram - cnt.v_wire_count * PAGE_SIZE;
  141 
  142         sysinfo.sharedram = 0;
  143         mtx_lock(&vm_object_list_mtx);
  144         TAILQ_FOREACH(object, &vm_object_list, object_list)
  145                 if (object->shadow_count > 1)
  146                         sysinfo.sharedram += object->resident_page_count;
  147         mtx_unlock(&vm_object_list_mtx);
  148 
  149         sysinfo.sharedram *= PAGE_SIZE;
  150         sysinfo.bufferram = 0;
  151 
  152         swap_pager_status(&i, &j);
  153         sysinfo.totalswap = i * PAGE_SIZE;
  154         sysinfo.freeswap = (i - j) * PAGE_SIZE;
  155 
  156         sysinfo.procs = nprocs;
  157 
  158         /* The following are only present in newer Linux kernels. */
  159         sysinfo.totalbig = 0;
  160         sysinfo.freebig = 0;
  161         sysinfo.mem_unit = 1;
  162 
  163         return copyout(&sysinfo, args->info, sizeof(sysinfo));
  164 }
  165 
  166 int
  167 linux_alarm(struct thread *td, struct linux_alarm_args *args)
  168 {
  169         struct itimerval it, old_it;
  170         u_int secs;
  171         int error;
  172 
  173 #ifdef DEBUG
  174         if (ldebug(alarm))
  175                 printf(ARGS(alarm, "%u"), args->secs);
  176 #endif
  177         
  178         secs = args->secs;
  179 
  180         if (secs > INT_MAX)
  181                 secs = INT_MAX;
  182 
  183         it.it_value.tv_sec = (long) secs;
  184         it.it_value.tv_usec = 0;
  185         it.it_interval.tv_sec = 0;
  186         it.it_interval.tv_usec = 0;
  187         error = kern_setitimer(td, ITIMER_REAL, &it, &old_it);
  188         if (error)
  189                 return (error);
  190         if (timevalisset(&old_it.it_value)) {
  191                 if (old_it.it_value.tv_usec != 0)
  192                         old_it.it_value.tv_sec++;
  193                 td->td_retval[0] = old_it.it_value.tv_sec;
  194         }
  195         return (0);
  196 }
  197 
  198 int
  199 linux_brk(struct thread *td, struct linux_brk_args *args)
  200 {
  201         struct vmspace *vm = td->td_proc->p_vmspace;
  202         vm_offset_t new, old;
  203         struct obreak_args /* {
  204                 char * nsize;
  205         } */ tmp;
  206 
  207 #ifdef DEBUG
  208         if (ldebug(brk))
  209                 printf(ARGS(brk, "%p"), (void *)(uintptr_t)args->dsend);
  210 #endif
  211         old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
  212         new = (vm_offset_t)args->dsend;
  213         tmp.nsize = (char *)new;
  214         if (((caddr_t)new > vm->vm_daddr) && !obreak(td, &tmp))
  215                 td->td_retval[0] = (long)new;
  216         else
  217                 td->td_retval[0] = (long)old;
  218 
  219         return 0;
  220 }
  221 
  222 #if defined(__i386__)
  223 /* XXX: what about amd64/linux32? */
  224 
  225 int
  226 linux_uselib(struct thread *td, struct linux_uselib_args *args)
  227 {
  228         struct nameidata ni;
  229         struct vnode *vp;
  230         struct exec *a_out;
  231         struct vattr attr;
  232         vm_offset_t vmaddr;
  233         unsigned long file_offset;
  234         vm_offset_t buffer;
  235         unsigned long bss_size;
  236         char *library;
  237         int error;
  238         int locked, vfslocked;
  239 
  240         LCONVPATHEXIST(td, args->library, &library);
  241 
  242 #ifdef DEBUG
  243         if (ldebug(uselib))
  244                 printf(ARGS(uselib, "%s"), library);
  245 #endif
  246 
  247         a_out = NULL;
  248         vfslocked = 0;
  249         locked = 0;
  250         vp = NULL;
  251 
  252         NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
  253             UIO_SYSSPACE, library, td);
  254         error = namei(&ni);
  255         LFREEPATH(library);
  256         if (error)
  257                 goto cleanup;
  258 
  259         vp = ni.ni_vp;
  260         vfslocked = NDHASGIANT(&ni);
  261         NDFREE(&ni, NDF_ONLY_PNBUF);
  262 
  263         /*
  264          * From here on down, we have a locked vnode that must be unlocked.
  265          * XXX: The code below largely duplicates exec_check_permissions().
  266          */
  267         locked = 1;
  268 
  269         /* Writable? */
  270         if (vp->v_writecount) {
  271                 error = ETXTBSY;
  272                 goto cleanup;
  273         }
  274 
  275         /* Executable? */
  276         error = VOP_GETATTR(vp, &attr, td->td_ucred);
  277         if (error)
  278                 goto cleanup;
  279 
  280         if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
  281             ((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) {
  282                 /* EACCESS is what exec(2) returns. */
  283                 error = ENOEXEC;
  284                 goto cleanup;
  285         }
  286 
  287         /* Sensible size? */
  288         if (attr.va_size == 0) {
  289                 error = ENOEXEC;
  290                 goto cleanup;
  291         }
  292 
  293         /* Can we access it? */
  294         error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
  295         if (error)
  296                 goto cleanup;
  297 
  298         /*
  299          * XXX: This should use vn_open() so that it is properly authorized,
  300          * and to reduce code redundancy all over the place here.
  301          * XXX: Not really, it duplicates far more of exec_check_permissions()
  302          * than vn_open().
  303          */
  304 #ifdef MAC
  305         error = mac_vnode_check_open(td->td_ucred, vp, VREAD);
  306         if (error)
  307                 goto cleanup;
  308 #endif
  309         error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
  310         if (error)
  311                 goto cleanup;
  312 
  313         /* Pull in executable header into kernel_map */
  314         error = vm_mmap(kernel_map, (vm_offset_t *)&a_out, PAGE_SIZE,
  315             VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0);
  316         if (error)
  317                 goto cleanup;
  318 
  319         /* Is it a Linux binary ? */
  320         if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
  321                 error = ENOEXEC;
  322                 goto cleanup;
  323         }
  324 
  325         /*
  326          * While we are here, we should REALLY do some more checks
  327          */
  328 
  329         /* Set file/virtual offset based on a.out variant. */
  330         switch ((int)(a_out->a_magic & 0xffff)) {
  331         case 0413:                      /* ZMAGIC */
  332                 file_offset = 1024;
  333                 break;
  334         case 0314:                      /* QMAGIC */
  335                 file_offset = 0;
  336                 break;
  337         default:
  338                 error = ENOEXEC;
  339                 goto cleanup;
  340         }
  341 
  342         bss_size = round_page(a_out->a_bss);
  343 
  344         /* Check various fields in header for validity/bounds. */
  345         if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
  346                 error = ENOEXEC;
  347                 goto cleanup;
  348         }
  349 
  350         /* text + data can't exceed file size */
  351         if (a_out->a_data + a_out->a_text > attr.va_size) {
  352                 error = EFAULT;
  353                 goto cleanup;
  354         }
  355 
  356         /*
  357          * text/data/bss must not exceed limits
  358          * XXX - this is not complete. it should check current usage PLUS
  359          * the resources needed by this library.
  360          */
  361         PROC_LOCK(td->td_proc);
  362         if (a_out->a_text > maxtsiz ||
  363             a_out->a_data + bss_size > lim_cur(td->td_proc, RLIMIT_DATA)) {
  364                 PROC_UNLOCK(td->td_proc);
  365                 error = ENOMEM;
  366                 goto cleanup;
  367         }
  368         PROC_UNLOCK(td->td_proc);
  369 
  370         /*
  371          * Prevent more writers.
  372          * XXX: Note that if any of the VM operations fail below we don't
  373          * clear this flag.
  374          */
  375         vp->v_vflag |= VV_TEXT;
  376 
  377         /*
  378          * Lock no longer needed
  379          */
  380         locked = 0;
  381         VOP_UNLOCK(vp, 0);
  382         VFS_UNLOCK_GIANT(vfslocked);
  383 
  384         /*
  385          * Check if file_offset page aligned. Currently we cannot handle
  386          * misalinged file offsets, and so we read in the entire image
  387          * (what a waste).
  388          */
  389         if (file_offset & PAGE_MASK) {
  390 #ifdef DEBUG
  391                 printf("uselib: Non page aligned binary %lu\n", file_offset);
  392 #endif
  393                 /* Map text+data read/write/execute */
  394 
  395                 /* a_entry is the load address and is page aligned */
  396                 vmaddr = trunc_page(a_out->a_entry);
  397 
  398                 /* get anon user mapping, read+write+execute */
  399                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  400                     &vmaddr, a_out->a_text + a_out->a_data, FALSE, VM_PROT_ALL,
  401                     VM_PROT_ALL, 0);
  402                 if (error)
  403                         goto cleanup;
  404 
  405                 /* map file into kernel_map */
  406                 error = vm_mmap(kernel_map, &buffer,
  407                     round_page(a_out->a_text + a_out->a_data + file_offset),
  408                     VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp,
  409                     trunc_page(file_offset));
  410                 if (error)
  411                         goto cleanup;
  412 
  413                 /* copy from kernel VM space to user space */
  414                 error = copyout(PTRIN(buffer + file_offset),
  415                     (void *)vmaddr, a_out->a_text + a_out->a_data);
  416 
  417                 /* release temporary kernel space */
  418                 vm_map_remove(kernel_map, buffer, buffer +
  419                     round_page(a_out->a_text + a_out->a_data + file_offset));
  420 
  421                 if (error)
  422                         goto cleanup;
  423         } else {
  424 #ifdef DEBUG
  425                 printf("uselib: Page aligned binary %lu\n", file_offset);
  426 #endif
  427                 /*
  428                  * for QMAGIC, a_entry is 20 bytes beyond the load address
  429                  * to skip the executable header
  430                  */
  431                 vmaddr = trunc_page(a_out->a_entry);
  432 
  433                 /*
  434                  * Map it all into the process's space as a single
  435                  * copy-on-write "data" segment.
  436                  */
  437                 error = vm_mmap(&td->td_proc->p_vmspace->vm_map, &vmaddr,
  438                     a_out->a_text + a_out->a_data, VM_PROT_ALL, VM_PROT_ALL,
  439                     MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, file_offset);
  440                 if (error)
  441                         goto cleanup;
  442         }
  443 #ifdef DEBUG
  444         printf("mem=%08lx = %08lx %08lx\n", (long)vmaddr, ((long *)vmaddr)[0],
  445             ((long *)vmaddr)[1]);
  446 #endif
  447         if (bss_size != 0) {
  448                 /* Calculate BSS start address */
  449                 vmaddr = trunc_page(a_out->a_entry) + a_out->a_text +
  450                     a_out->a_data;
  451 
  452                 /* allocate some 'anon' space */
  453                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  454                     &vmaddr, bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  455                 if (error)
  456                         goto cleanup;
  457         }
  458 
  459 cleanup:
  460         /* Unlock vnode if needed */
  461         if (locked) {
  462                 VOP_UNLOCK(vp, 0);
  463                 VFS_UNLOCK_GIANT(vfslocked);
  464         }
  465 
  466         /* Release the kernel mapping. */
  467         if (a_out)
  468                 vm_map_remove(kernel_map, (vm_offset_t)a_out,
  469                     (vm_offset_t)a_out + PAGE_SIZE);
  470 
  471         return error;
  472 }
  473 
  474 #endif  /* __i386__ */
  475 
  476 int
  477 linux_select(struct thread *td, struct linux_select_args *args)
  478 {
  479         l_timeval ltv;
  480         struct timeval tv0, tv1, utv, *tvp;
  481         int error;
  482 
  483 #ifdef DEBUG
  484         if (ldebug(select))
  485                 printf(ARGS(select, "%d, %p, %p, %p, %p"), args->nfds,
  486                     (void *)args->readfds, (void *)args->writefds,
  487                     (void *)args->exceptfds, (void *)args->timeout);
  488 #endif
  489 
  490         /*
  491          * Store current time for computation of the amount of
  492          * time left.
  493          */
  494         if (args->timeout) {
  495                 if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
  496                         goto select_out;
  497                 utv.tv_sec = ltv.tv_sec;
  498                 utv.tv_usec = ltv.tv_usec;
  499 #ifdef DEBUG
  500                 if (ldebug(select))
  501                         printf(LMSG("incoming timeout (%jd/%ld)"),
  502                             (intmax_t)utv.tv_sec, utv.tv_usec);
  503 #endif
  504 
  505                 if (itimerfix(&utv)) {
  506                         /*
  507                          * The timeval was invalid.  Convert it to something
  508                          * valid that will act as it does under Linux.
  509                          */
  510                         utv.tv_sec += utv.tv_usec / 1000000;
  511                         utv.tv_usec %= 1000000;
  512                         if (utv.tv_usec < 0) {
  513                                 utv.tv_sec -= 1;
  514                                 utv.tv_usec += 1000000;
  515                         }
  516                         if (utv.tv_sec < 0)
  517                                 timevalclear(&utv);
  518                 }
  519                 microtime(&tv0);
  520                 tvp = &utv;
  521         } else
  522                 tvp = NULL;
  523 
  524         error = kern_select(td, args->nfds, args->readfds, args->writefds,
  525             args->exceptfds, tvp, sizeof(l_int) * 8);
  526 
  527 #ifdef DEBUG
  528         if (ldebug(select))
  529                 printf(LMSG("real select returns %d"), error);
  530 #endif
  531         if (error)
  532                 goto select_out;
  533 
  534         if (args->timeout) {
  535                 if (td->td_retval[0]) {
  536                         /*
  537                          * Compute how much time was left of the timeout,
  538                          * by subtracting the current time and the time
  539                          * before we started the call, and subtracting
  540                          * that result from the user-supplied value.
  541                          */
  542                         microtime(&tv1);
  543                         timevalsub(&tv1, &tv0);
  544                         timevalsub(&utv, &tv1);
  545                         if (utv.tv_sec < 0)
  546                                 timevalclear(&utv);
  547                 } else
  548                         timevalclear(&utv);
  549 #ifdef DEBUG
  550                 if (ldebug(select))
  551                         printf(LMSG("outgoing timeout (%jd/%ld)"),
  552                             (intmax_t)utv.tv_sec, utv.tv_usec);
  553 #endif
  554                 ltv.tv_sec = utv.tv_sec;
  555                 ltv.tv_usec = utv.tv_usec;
  556                 if ((error = copyout(&ltv, args->timeout, sizeof(ltv))))
  557                         goto select_out;
  558         }
  559 
  560 select_out:
  561 #ifdef DEBUG
  562         if (ldebug(select))
  563                 printf(LMSG("select_out -> %d"), error);
  564 #endif
  565         return error;
  566 }
  567 
  568 int
  569 linux_mremap(struct thread *td, struct linux_mremap_args *args)
  570 {
  571         struct munmap_args /* {
  572                 void *addr;
  573                 size_t len;
  574         } */ bsd_args;
  575         int error = 0;
  576 
  577 #ifdef DEBUG
  578         if (ldebug(mremap))
  579                 printf(ARGS(mremap, "%p, %08lx, %08lx, %08lx"),
  580                     (void *)(uintptr_t)args->addr,
  581                     (unsigned long)args->old_len,
  582                     (unsigned long)args->new_len,
  583                     (unsigned long)args->flags);
  584 #endif
  585 
  586         if (args->flags & ~(LINUX_MREMAP_FIXED | LINUX_MREMAP_MAYMOVE)) {
  587                 td->td_retval[0] = 0;
  588                 return (EINVAL);
  589         }
  590 
  591         /*
  592          * Check for the page alignment.
  593          * Linux defines PAGE_MASK to be FreeBSD ~PAGE_MASK.
  594          */
  595         if (args->addr & PAGE_MASK) {
  596                 td->td_retval[0] = 0;
  597                 return (EINVAL);
  598         }
  599 
  600         args->new_len = round_page(args->new_len);
  601         args->old_len = round_page(args->old_len);
  602 
  603         if (args->new_len > args->old_len) {
  604                 td->td_retval[0] = 0;
  605                 return ENOMEM;
  606         }
  607 
  608         if (args->new_len < args->old_len) {
  609                 bsd_args.addr =
  610                     (caddr_t)((uintptr_t)args->addr + args->new_len);
  611                 bsd_args.len = args->old_len - args->new_len;
  612                 error = munmap(td, &bsd_args);
  613         }
  614 
  615         td->td_retval[0] = error ? 0 : (uintptr_t)args->addr;
  616         return error;
  617 }
  618 
  619 #define LINUX_MS_ASYNC       0x0001
  620 #define LINUX_MS_INVALIDATE  0x0002
  621 #define LINUX_MS_SYNC        0x0004
  622 
  623 int
  624 linux_msync(struct thread *td, struct linux_msync_args *args)
  625 {
  626         struct msync_args bsd_args;
  627 
  628         bsd_args.addr = (caddr_t)(uintptr_t)args->addr;
  629         bsd_args.len = (uintptr_t)args->len;
  630         bsd_args.flags = args->fl & ~LINUX_MS_SYNC;
  631 
  632         return msync(td, &bsd_args);
  633 }
  634 
  635 int
  636 linux_time(struct thread *td, struct linux_time_args *args)
  637 {
  638         struct timeval tv;
  639         l_time_t tm;
  640         int error;
  641 
  642 #ifdef DEBUG
  643         if (ldebug(time))
  644                 printf(ARGS(time, "*"));
  645 #endif
  646 
  647         microtime(&tv);
  648         tm = tv.tv_sec;
  649         if (args->tm && (error = copyout(&tm, args->tm, sizeof(tm))))
  650                 return error;
  651         td->td_retval[0] = tm;
  652         return 0;
  653 }
  654 
  655 struct l_times_argv {
  656         l_clock_t       tms_utime;
  657         l_clock_t       tms_stime;
  658         l_clock_t       tms_cutime;
  659         l_clock_t       tms_cstime;
  660 };
  661 
  662 
  663 /*
  664  * Glibc versions prior to 2.2.1 always use hard-coded CLK_TCK value.
  665  * Since 2.2.1 Glibc uses value exported from kernel via AT_CLKTCK
  666  * auxiliary vector entry.
  667  */
  668 #define CLK_TCK         100
  669 
  670 #define CONVOTCK(r)     (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  671 #define CONVNTCK(r)     (r.tv_sec * stclohz + r.tv_usec / (1000000 / stclohz))
  672 
  673 #define CONVTCK(r)      (linux_kernver(td) >= LINUX_KERNVER_2004000 ?           \
  674                             CONVNTCK(r) : CONVOTCK(r))
  675 
  676 int
  677 linux_times(struct thread *td, struct linux_times_args *args)
  678 {
  679         struct timeval tv, utime, stime, cutime, cstime;
  680         struct l_times_argv tms;
  681         struct proc *p;
  682         int error;
  683 
  684 #ifdef DEBUG
  685         if (ldebug(times))
  686                 printf(ARGS(times, "*"));
  687 #endif
  688 
  689         if (args->buf != NULL) {
  690                 p = td->td_proc;
  691                 PROC_LOCK(p);
  692                 PROC_SLOCK(p);
  693                 calcru(p, &utime, &stime);
  694                 PROC_SUNLOCK(p);
  695                 calccru(p, &cutime, &cstime);
  696                 PROC_UNLOCK(p);
  697 
  698                 tms.tms_utime = CONVTCK(utime);
  699                 tms.tms_stime = CONVTCK(stime);
  700 
  701                 tms.tms_cutime = CONVTCK(cutime);
  702                 tms.tms_cstime = CONVTCK(cstime);
  703 
  704                 if ((error = copyout(&tms, args->buf, sizeof(tms))))
  705                         return error;
  706         }
  707 
  708         microuptime(&tv);
  709         td->td_retval[0] = (int)CONVTCK(tv);
  710         return 0;
  711 }
  712 
  713 int
  714 linux_newuname(struct thread *td, struct linux_newuname_args *args)
  715 {
  716         struct l_new_utsname utsname;
  717         char osname[LINUX_MAX_UTSNAME];
  718         char osrelease[LINUX_MAX_UTSNAME];
  719         char *p;
  720 
  721 #ifdef DEBUG
  722         if (ldebug(newuname))
  723                 printf(ARGS(newuname, "*"));
  724 #endif
  725 
  726         linux_get_osname(td, osname);
  727         linux_get_osrelease(td, osrelease);
  728 
  729         bzero(&utsname, sizeof(utsname));
  730         strlcpy(utsname.sysname, osname, LINUX_MAX_UTSNAME);
  731         getcredhostname(td->td_ucred, utsname.nodename, LINUX_MAX_UTSNAME);
  732         getcreddomainname(td->td_ucred, utsname.domainname, LINUX_MAX_UTSNAME);
  733         strlcpy(utsname.release, osrelease, LINUX_MAX_UTSNAME);
  734         strlcpy(utsname.version, version, LINUX_MAX_UTSNAME);
  735         for (p = utsname.version; *p != '\0'; ++p)
  736                 if (*p == '\n') {
  737                         *p = '\0';
  738                         break;
  739                 }
  740         strlcpy(utsname.machine, linux_platform, LINUX_MAX_UTSNAME);
  741 
  742         return (copyout(&utsname, args->buf, sizeof(utsname)));
  743 }
  744 
  745 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  746 struct l_utimbuf {
  747         l_time_t l_actime;
  748         l_time_t l_modtime;
  749 };
  750 
  751 int
  752 linux_utime(struct thread *td, struct linux_utime_args *args)
  753 {
  754         struct timeval tv[2], *tvp;
  755         struct l_utimbuf lut;
  756         char *fname;
  757         int error;
  758 
  759         LCONVPATHEXIST(td, args->fname, &fname);
  760 
  761 #ifdef DEBUG
  762         if (ldebug(utime))
  763                 printf(ARGS(utime, "%s, *"), fname);
  764 #endif
  765 
  766         if (args->times) {
  767                 if ((error = copyin(args->times, &lut, sizeof lut))) {
  768                         LFREEPATH(fname);
  769                         return error;
  770                 }
  771                 tv[0].tv_sec = lut.l_actime;
  772                 tv[0].tv_usec = 0;
  773                 tv[1].tv_sec = lut.l_modtime;
  774                 tv[1].tv_usec = 0;
  775                 tvp = tv;
  776         } else
  777                 tvp = NULL;
  778 
  779         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  780         LFREEPATH(fname);
  781         return (error);
  782 }
  783 
  784 int
  785 linux_utimes(struct thread *td, struct linux_utimes_args *args)
  786 {
  787         l_timeval ltv[2];
  788         struct timeval tv[2], *tvp = NULL;
  789         char *fname;
  790         int error;
  791 
  792         LCONVPATHEXIST(td, args->fname, &fname);
  793 
  794 #ifdef DEBUG
  795         if (ldebug(utimes))
  796                 printf(ARGS(utimes, "%s, *"), fname);
  797 #endif
  798 
  799         if (args->tptr != NULL) {
  800                 if ((error = copyin(args->tptr, ltv, sizeof ltv))) {
  801                         LFREEPATH(fname);
  802                         return (error);
  803                 }
  804                 tv[0].tv_sec = ltv[0].tv_sec;
  805                 tv[0].tv_usec = ltv[0].tv_usec;
  806                 tv[1].tv_sec = ltv[1].tv_sec;
  807                 tv[1].tv_usec = ltv[1].tv_usec;
  808                 tvp = tv;
  809         }
  810 
  811         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  812         LFREEPATH(fname);
  813         return (error);
  814 }
  815 
  816 int
  817 linux_futimesat(struct thread *td, struct linux_futimesat_args *args)
  818 {
  819         l_timeval ltv[2];
  820         struct timeval tv[2], *tvp = NULL;
  821         char *fname;
  822         int error, dfd;
  823 
  824         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  825         LCONVPATHEXIST_AT(td, args->filename, &fname, dfd);
  826 
  827 #ifdef DEBUG
  828         if (ldebug(futimesat))
  829                 printf(ARGS(futimesat, "%s, *"), fname);
  830 #endif
  831 
  832         if (args->utimes != NULL) {
  833                 if ((error = copyin(args->utimes, ltv, sizeof ltv))) {
  834                         LFREEPATH(fname);
  835                         return (error);
  836                 }
  837                 tv[0].tv_sec = ltv[0].tv_sec;
  838                 tv[0].tv_usec = ltv[0].tv_usec;
  839                 tv[1].tv_sec = ltv[1].tv_sec;
  840                 tv[1].tv_usec = ltv[1].tv_usec;
  841                 tvp = tv;
  842         }
  843 
  844         error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  845         LFREEPATH(fname);
  846         return (error);
  847 }
  848 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  849 
  850 #define __WCLONE 0x80000000
  851 
  852 int
  853 linux_waitpid(struct thread *td, struct linux_waitpid_args *args)
  854 {
  855         int error, options, tmpstat;
  856 
  857 #ifdef DEBUG
  858         if (ldebug(waitpid))
  859                 printf(ARGS(waitpid, "%d, %p, %d"),
  860                     args->pid, (void *)args->status, args->options);
  861 #endif
  862         /*
  863          * this is necessary because the test in kern_wait doesn't work
  864          * because we mess with the options here
  865          */
  866         if (args->options & ~(WUNTRACED | WNOHANG | WCONTINUED | __WCLONE))
  867                 return (EINVAL);
  868 
  869         options = (args->options & (WNOHANG | WUNTRACED));
  870         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
  871         if (args->options & __WCLONE)
  872                 options |= WLINUXCLONE;
  873 
  874         error = kern_wait(td, args->pid, &tmpstat, options, NULL);
  875         if (error)
  876                 return error;
  877 
  878         if (args->status) {
  879                 tmpstat &= 0xffff;
  880                 if (WIFSIGNALED(tmpstat))
  881                         tmpstat = (tmpstat & 0xffffff80) |
  882                             BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
  883                 else if (WIFSTOPPED(tmpstat))
  884                         tmpstat = (tmpstat & 0xffff00ff) |
  885                             (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
  886                 return copyout(&tmpstat, args->status, sizeof(int));
  887         }
  888 
  889         return 0;
  890 }
  891 
  892 int
  893 linux_wait4(struct thread *td, struct linux_wait4_args *args)
  894 {
  895         int error, options, tmpstat;
  896         struct rusage ru, *rup;
  897         struct proc *p;
  898 
  899 #ifdef DEBUG
  900         if (ldebug(wait4))
  901                 printf(ARGS(wait4, "%d, %p, %d, %p"),
  902                     args->pid, (void *)args->status, args->options,
  903                     (void *)args->rusage);
  904 #endif
  905 
  906         options = (args->options & (WNOHANG | WUNTRACED));
  907         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
  908         if (args->options & __WCLONE)
  909                 options |= WLINUXCLONE;
  910 
  911         if (args->rusage != NULL)
  912                 rup = &ru;
  913         else
  914                 rup = NULL;
  915         error = kern_wait(td, args->pid, &tmpstat, options, rup);
  916         if (error)
  917                 return error;
  918 
  919         p = td->td_proc;
  920         PROC_LOCK(p);
  921         sigqueue_delete(&p->p_sigqueue, SIGCHLD);
  922         PROC_UNLOCK(p);
  923 
  924         if (args->status) {
  925                 tmpstat &= 0xffff;
  926                 if (WIFSIGNALED(tmpstat))
  927                         tmpstat = (tmpstat & 0xffffff80) |
  928                             BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
  929                 else if (WIFSTOPPED(tmpstat))
  930                         tmpstat = (tmpstat & 0xffff00ff) |
  931                             (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
  932                 error = copyout(&tmpstat, args->status, sizeof(int));
  933         }
  934         if (args->rusage != NULL && error == 0)
  935                 error = copyout(&ru, args->rusage, sizeof(ru));
  936 
  937         return (error);
  938 }
  939 
  940 int
  941 linux_mknod(struct thread *td, struct linux_mknod_args *args)
  942 {
  943         char *path;
  944         int error;
  945 
  946         LCONVPATHCREAT(td, args->path, &path);
  947 
  948 #ifdef DEBUG
  949         if (ldebug(mknod))
  950                 printf(ARGS(mknod, "%s, %d, %d"), path, args->mode, args->dev);
  951 #endif
  952 
  953         switch (args->mode & S_IFMT) {
  954         case S_IFIFO:
  955         case S_IFSOCK:
  956                 error = kern_mkfifo(td, path, UIO_SYSSPACE, args->mode);
  957                 break;
  958 
  959         case S_IFCHR:
  960         case S_IFBLK:
  961                 error = kern_mknod(td, path, UIO_SYSSPACE, args->mode,
  962                     args->dev);
  963                 break;
  964 
  965         case S_IFDIR:
  966                 error = EPERM;
  967                 break;
  968 
  969         case 0:
  970                 args->mode |= S_IFREG;
  971                 /* FALLTHROUGH */
  972         case S_IFREG:
  973                 error = kern_open(td, path, UIO_SYSSPACE,
  974                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  975                 if (error == 0)
  976                         kern_close(td, td->td_retval[0]);
  977                 break;
  978 
  979         default:
  980                 error = EINVAL;
  981                 break;
  982         }
  983         LFREEPATH(path);
  984         return (error);
  985 }
  986 
  987 int
  988 linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
  989 {
  990         char *path;
  991         int error, dfd;
  992 
  993         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  994         LCONVPATHCREAT_AT(td, args->filename, &path, dfd);
  995 
  996 #ifdef DEBUG
  997         if (ldebug(mknodat))
  998                 printf(ARGS(mknodat, "%s, %d, %d"), path, args->mode, args->dev);
  999 #endif
 1000 
 1001         switch (args->mode & S_IFMT) {
 1002         case S_IFIFO:
 1003         case S_IFSOCK:
 1004                 error = kern_mkfifoat(td, dfd, path, UIO_SYSSPACE, args->mode);
 1005                 break;
 1006 
 1007         case S_IFCHR:
 1008         case S_IFBLK:
 1009                 error = kern_mknodat(td, dfd, path, UIO_SYSSPACE, args->mode,
 1010                     args->dev);
 1011                 break;
 1012 
 1013         case S_IFDIR:
 1014                 error = EPERM;
 1015                 break;
 1016 
 1017         case 0:
 1018                 args->mode |= S_IFREG;
 1019                 /* FALLTHROUGH */
 1020         case S_IFREG:
 1021                 error = kern_openat(td, dfd, path, UIO_SYSSPACE,
 1022                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
 1023                 if (error == 0)
 1024                         kern_close(td, td->td_retval[0]);
 1025                 break;
 1026 
 1027         default:
 1028                 error = EINVAL;
 1029                 break;
 1030         }
 1031         LFREEPATH(path);
 1032         return (error);
 1033 }
 1034 
 1035 /*
 1036  * UGH! This is just about the dumbest idea I've ever heard!!
 1037  */
 1038 int
 1039 linux_personality(struct thread *td, struct linux_personality_args *args)
 1040 {
 1041 #ifdef DEBUG
 1042         if (ldebug(personality))
 1043                 printf(ARGS(personality, "%lu"), (unsigned long)args->per);
 1044 #endif
 1045         if (args->per != 0)
 1046                 return EINVAL;
 1047 
 1048         /* Yes Jim, it's still a Linux... */
 1049         td->td_retval[0] = 0;
 1050         return 0;
 1051 }
 1052 
 1053 struct l_itimerval {
 1054         l_timeval it_interval;
 1055         l_timeval it_value;
 1056 };
 1057 
 1058 #define B2L_ITIMERVAL(bip, lip)                                         \
 1059         (bip)->it_interval.tv_sec = (lip)->it_interval.tv_sec;          \
 1060         (bip)->it_interval.tv_usec = (lip)->it_interval.tv_usec;        \
 1061         (bip)->it_value.tv_sec = (lip)->it_value.tv_sec;                \
 1062         (bip)->it_value.tv_usec = (lip)->it_value.tv_usec;
 1063 
 1064 int
 1065 linux_setitimer(struct thread *td, struct linux_setitimer_args *uap)
 1066 {
 1067         int error;
 1068         struct l_itimerval ls;
 1069         struct itimerval aitv, oitv;
 1070 
 1071 #ifdef DEBUG
 1072         if (ldebug(setitimer))
 1073                 printf(ARGS(setitimer, "%p, %p"),
 1074                     (void *)uap->itv, (void *)uap->oitv);
 1075 #endif
 1076 
 1077         if (uap->itv == NULL) {
 1078                 uap->itv = uap->oitv;
 1079                 return (linux_getitimer(td, (struct linux_getitimer_args *)uap));
 1080         }
 1081 
 1082         error = copyin(uap->itv, &ls, sizeof(ls));
 1083         if (error != 0)
 1084                 return (error);
 1085         B2L_ITIMERVAL(&aitv, &ls);
 1086 #ifdef DEBUG
 1087         if (ldebug(setitimer)) {
 1088                 printf("setitimer: value: sec: %jd, usec: %ld\n",
 1089                     (intmax_t)aitv.it_value.tv_sec, aitv.it_value.tv_usec);
 1090                 printf("setitimer: interval: sec: %jd, usec: %ld\n",
 1091                     (intmax_t)aitv.it_interval.tv_sec, aitv.it_interval.tv_usec);
 1092         }
 1093 #endif
 1094         error = kern_setitimer(td, uap->which, &aitv, &oitv);
 1095         if (error != 0 || uap->oitv == NULL)
 1096                 return (error);
 1097         B2L_ITIMERVAL(&ls, &oitv);
 1098 
 1099         return (copyout(&ls, uap->oitv, sizeof(ls)));
 1100 }
 1101 
 1102 int
 1103 linux_getitimer(struct thread *td, struct linux_getitimer_args *uap)
 1104 {
 1105         int error;
 1106         struct l_itimerval ls;
 1107         struct itimerval aitv;
 1108 
 1109 #ifdef DEBUG
 1110         if (ldebug(getitimer))
 1111                 printf(ARGS(getitimer, "%p"), (void *)uap->itv);
 1112 #endif
 1113         error = kern_getitimer(td, uap->which, &aitv);
 1114         if (error != 0)
 1115                 return (error);
 1116         B2L_ITIMERVAL(&ls, &aitv);
 1117         return (copyout(&ls, uap->itv, sizeof(ls)));
 1118 }
 1119 
 1120 int
 1121 linux_nice(struct thread *td, struct linux_nice_args *args)
 1122 {
 1123         struct setpriority_args bsd_args;
 1124 
 1125         bsd_args.which = PRIO_PROCESS;
 1126         bsd_args.who = 0;               /* current process */
 1127         bsd_args.prio = args->inc;
 1128         return setpriority(td, &bsd_args);
 1129 }
 1130 
 1131 int
 1132 linux_setgroups(struct thread *td, struct linux_setgroups_args *args)
 1133 {
 1134         struct ucred *newcred, *oldcred;
 1135         l_gid_t *linux_gidset;
 1136         gid_t *bsd_gidset;
 1137         int ngrp, error;
 1138         struct proc *p;
 1139 
 1140         ngrp = args->gidsetsize;
 1141         if (ngrp < 0 || ngrp >= NGROUPS)
 1142                 return (EINVAL);
 1143         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK);
 1144         error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t));
 1145         if (error)
 1146                 goto out;
 1147         newcred = crget();
 1148         p = td->td_proc;
 1149         PROC_LOCK(p);
 1150         oldcred = crcopysafe(p, newcred);
 1151 
 1152         /*
 1153          * cr_groups[0] holds egid. Setting the whole set from
 1154          * the supplied set will cause egid to be changed too.
 1155          * Keep cr_groups[0] unchanged to prevent that.
 1156          */
 1157 
 1158         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
 1159                 PROC_UNLOCK(p);
 1160                 crfree(newcred);
 1161                 goto out;
 1162         }
 1163 
 1164         if (ngrp > 0) {
 1165                 newcred->cr_ngroups = ngrp + 1;
 1166 
 1167                 bsd_gidset = newcred->cr_groups;
 1168                 ngrp--;
 1169                 while (ngrp >= 0) {
 1170                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
 1171                         ngrp--;
 1172                 }
 1173         } else
 1174                 newcred->cr_ngroups = 1;
 1175 
 1176         setsugid(p);
 1177         p->p_ucred = newcred;
 1178         PROC_UNLOCK(p);
 1179         crfree(oldcred);
 1180         error = 0;
 1181 out:
 1182         free(linux_gidset, M_TEMP);
 1183         return (error);
 1184 }
 1185 
 1186 int
 1187 linux_getgroups(struct thread *td, struct linux_getgroups_args *args)
 1188 {
 1189         struct ucred *cred;
 1190         l_gid_t *linux_gidset;
 1191         gid_t *bsd_gidset;
 1192         int bsd_gidsetsz, ngrp, error;
 1193 
 1194         cred = td->td_ucred;
 1195         bsd_gidset = cred->cr_groups;
 1196         bsd_gidsetsz = cred->cr_ngroups - 1;
 1197 
 1198         /*
 1199          * cr_groups[0] holds egid. Returning the whole set
 1200          * here will cause a duplicate. Exclude cr_groups[0]
 1201          * to prevent that.
 1202          */
 1203 
 1204         if ((ngrp = args->gidsetsize) == 0) {
 1205                 td->td_retval[0] = bsd_gidsetsz;
 1206                 return (0);
 1207         }
 1208 
 1209         if (ngrp < bsd_gidsetsz)
 1210                 return (EINVAL);
 1211 
 1212         ngrp = 0;
 1213         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
 1214             M_TEMP, M_WAITOK);
 1215         while (ngrp < bsd_gidsetsz) {
 1216                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
 1217                 ngrp++;
 1218         }
 1219 
 1220         error = copyout(linux_gidset, args->grouplist, ngrp * sizeof(l_gid_t));
 1221         free(linux_gidset, M_TEMP);
 1222         if (error)
 1223                 return (error);
 1224 
 1225         td->td_retval[0] = ngrp;
 1226         return (0);
 1227 }
 1228 
 1229 int
 1230 linux_setrlimit(struct thread *td, struct linux_setrlimit_args *args)
 1231 {
 1232         struct rlimit bsd_rlim;
 1233         struct l_rlimit rlim;
 1234         u_int which;
 1235         int error;
 1236 
 1237 #ifdef DEBUG
 1238         if (ldebug(setrlimit))
 1239                 printf(ARGS(setrlimit, "%d, %p"),
 1240                     args->resource, (void *)args->rlim);
 1241 #endif
 1242 
 1243         if (args->resource >= LINUX_RLIM_NLIMITS)
 1244                 return (EINVAL);
 1245 
 1246         which = linux_to_bsd_resource[args->resource];
 1247         if (which == -1)
 1248                 return (EINVAL);
 1249 
 1250         error = copyin(args->rlim, &rlim, sizeof(rlim));
 1251         if (error)
 1252                 return (error);
 1253 
 1254         bsd_rlim.rlim_cur = (rlim_t)rlim.rlim_cur;
 1255         bsd_rlim.rlim_max = (rlim_t)rlim.rlim_max;
 1256         return (kern_setrlimit(td, which, &bsd_rlim));
 1257 }
 1258 
 1259 int
 1260 linux_old_getrlimit(struct thread *td, struct linux_old_getrlimit_args *args)
 1261 {
 1262         struct l_rlimit rlim;
 1263         struct proc *p = td->td_proc;
 1264         struct rlimit bsd_rlim;
 1265         u_int which;
 1266 
 1267 #ifdef DEBUG
 1268         if (ldebug(old_getrlimit))
 1269                 printf(ARGS(old_getrlimit, "%d, %p"),
 1270                     args->resource, (void *)args->rlim);
 1271 #endif
 1272 
 1273         if (args->resource >= LINUX_RLIM_NLIMITS)
 1274                 return (EINVAL);
 1275 
 1276         which = linux_to_bsd_resource[args->resource];
 1277         if (which == -1)
 1278                 return (EINVAL);
 1279 
 1280         PROC_LOCK(p);
 1281         lim_rlimit(p, which, &bsd_rlim);
 1282         PROC_UNLOCK(p);
 1283 
 1284 #ifdef COMPAT_LINUX32
 1285         rlim.rlim_cur = (unsigned int)bsd_rlim.rlim_cur;
 1286         if (rlim.rlim_cur == UINT_MAX)
 1287                 rlim.rlim_cur = INT_MAX;
 1288         rlim.rlim_max = (unsigned int)bsd_rlim.rlim_max;
 1289         if (rlim.rlim_max == UINT_MAX)
 1290                 rlim.rlim_max = INT_MAX;
 1291 #else
 1292         rlim.rlim_cur = (unsigned long)bsd_rlim.rlim_cur;
 1293         if (rlim.rlim_cur == ULONG_MAX)
 1294                 rlim.rlim_cur = LONG_MAX;
 1295         rlim.rlim_max = (unsigned long)bsd_rlim.rlim_max;
 1296         if (rlim.rlim_max == ULONG_MAX)
 1297                 rlim.rlim_max = LONG_MAX;
 1298 #endif
 1299         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1300 }
 1301 
 1302 int
 1303 linux_getrlimit(struct thread *td, struct linux_getrlimit_args *args)
 1304 {
 1305         struct l_rlimit rlim;
 1306         struct proc *p = td->td_proc;
 1307         struct rlimit bsd_rlim;
 1308         u_int which;
 1309 
 1310 #ifdef DEBUG
 1311         if (ldebug(getrlimit))
 1312                 printf(ARGS(getrlimit, "%d, %p"),
 1313                     args->resource, (void *)args->rlim);
 1314 #endif
 1315 
 1316         if (args->resource >= LINUX_RLIM_NLIMITS)
 1317                 return (EINVAL);
 1318 
 1319         which = linux_to_bsd_resource[args->resource];
 1320         if (which == -1)
 1321                 return (EINVAL);
 1322 
 1323         PROC_LOCK(p);
 1324         lim_rlimit(p, which, &bsd_rlim);
 1325         PROC_UNLOCK(p);
 1326 
 1327         rlim.rlim_cur = (l_ulong)bsd_rlim.rlim_cur;
 1328         rlim.rlim_max = (l_ulong)bsd_rlim.rlim_max;
 1329         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1330 }
 1331 
 1332 int
 1333 linux_sched_setscheduler(struct thread *td,
 1334     struct linux_sched_setscheduler_args *args)
 1335 {
 1336         struct sched_setscheduler_args bsd;
 1337 
 1338 #ifdef DEBUG
 1339         if (ldebug(sched_setscheduler))
 1340                 printf(ARGS(sched_setscheduler, "%d, %d, %p"),
 1341                     args->pid, args->policy, (const void *)args->param);
 1342 #endif
 1343 
 1344         switch (args->policy) {
 1345         case LINUX_SCHED_OTHER:
 1346                 bsd.policy = SCHED_OTHER;
 1347                 break;
 1348         case LINUX_SCHED_FIFO:
 1349                 bsd.policy = SCHED_FIFO;
 1350                 break;
 1351         case LINUX_SCHED_RR:
 1352                 bsd.policy = SCHED_RR;
 1353                 break;
 1354         default:
 1355                 return EINVAL;
 1356         }
 1357 
 1358         bsd.pid = args->pid;
 1359         bsd.param = (struct sched_param *)args->param;
 1360         return sched_setscheduler(td, &bsd);
 1361 }
 1362 
 1363 int
 1364 linux_sched_getscheduler(struct thread *td,
 1365     struct linux_sched_getscheduler_args *args)
 1366 {
 1367         struct sched_getscheduler_args bsd;
 1368         int error;
 1369 
 1370 #ifdef DEBUG
 1371         if (ldebug(sched_getscheduler))
 1372                 printf(ARGS(sched_getscheduler, "%d"), args->pid);
 1373 #endif
 1374 
 1375         bsd.pid = args->pid;
 1376         error = sched_getscheduler(td, &bsd);
 1377 
 1378         switch (td->td_retval[0]) {
 1379         case SCHED_OTHER:
 1380                 td->td_retval[0] = LINUX_SCHED_OTHER;
 1381                 break;
 1382         case SCHED_FIFO:
 1383                 td->td_retval[0] = LINUX_SCHED_FIFO;
 1384                 break;
 1385         case SCHED_RR:
 1386                 td->td_retval[0] = LINUX_SCHED_RR;
 1387                 break;
 1388         }
 1389 
 1390         return error;
 1391 }
 1392 
 1393 int
 1394 linux_sched_get_priority_max(struct thread *td,
 1395     struct linux_sched_get_priority_max_args *args)
 1396 {
 1397         struct sched_get_priority_max_args bsd;
 1398 
 1399 #ifdef DEBUG
 1400         if (ldebug(sched_get_priority_max))
 1401                 printf(ARGS(sched_get_priority_max, "%d"), args->policy);
 1402 #endif
 1403 
 1404         switch (args->policy) {
 1405         case LINUX_SCHED_OTHER:
 1406                 bsd.policy = SCHED_OTHER;
 1407                 break;
 1408         case LINUX_SCHED_FIFO:
 1409                 bsd.policy = SCHED_FIFO;
 1410                 break;
 1411         case LINUX_SCHED_RR:
 1412                 bsd.policy = SCHED_RR;
 1413                 break;
 1414         default:
 1415                 return EINVAL;
 1416         }
 1417         return sched_get_priority_max(td, &bsd);
 1418 }
 1419 
 1420 int
 1421 linux_sched_get_priority_min(struct thread *td,
 1422     struct linux_sched_get_priority_min_args *args)
 1423 {
 1424         struct sched_get_priority_min_args bsd;
 1425 
 1426 #ifdef DEBUG
 1427         if (ldebug(sched_get_priority_min))
 1428                 printf(ARGS(sched_get_priority_min, "%d"), args->policy);
 1429 #endif
 1430 
 1431         switch (args->policy) {
 1432         case LINUX_SCHED_OTHER:
 1433                 bsd.policy = SCHED_OTHER;
 1434                 break;
 1435         case LINUX_SCHED_FIFO:
 1436                 bsd.policy = SCHED_FIFO;
 1437                 break;
 1438         case LINUX_SCHED_RR:
 1439                 bsd.policy = SCHED_RR;
 1440                 break;
 1441         default:
 1442                 return EINVAL;
 1443         }
 1444         return sched_get_priority_min(td, &bsd);
 1445 }
 1446 
 1447 #define REBOOT_CAD_ON   0x89abcdef
 1448 #define REBOOT_CAD_OFF  0
 1449 #define REBOOT_HALT     0xcdef0123
 1450 #define REBOOT_RESTART  0x01234567
 1451 #define REBOOT_RESTART2 0xA1B2C3D4
 1452 #define REBOOT_POWEROFF 0x4321FEDC
 1453 #define REBOOT_MAGIC1   0xfee1dead
 1454 #define REBOOT_MAGIC2   0x28121969
 1455 #define REBOOT_MAGIC2A  0x05121996
 1456 #define REBOOT_MAGIC2B  0x16041998
 1457 
 1458 int
 1459 linux_reboot(struct thread *td, struct linux_reboot_args *args)
 1460 {
 1461         struct reboot_args bsd_args;
 1462 
 1463 #ifdef DEBUG
 1464         if (ldebug(reboot))
 1465                 printf(ARGS(reboot, "0x%x"), args->cmd);
 1466 #endif
 1467 
 1468         if (args->magic1 != REBOOT_MAGIC1)
 1469                 return EINVAL;
 1470 
 1471         switch (args->magic2) {
 1472         case REBOOT_MAGIC2:
 1473         case REBOOT_MAGIC2A:
 1474         case REBOOT_MAGIC2B:
 1475                 break;
 1476         default:
 1477                 return EINVAL;
 1478         }
 1479 
 1480         switch (args->cmd) {
 1481         case REBOOT_CAD_ON:
 1482         case REBOOT_CAD_OFF:
 1483                 return (priv_check(td, PRIV_REBOOT));
 1484         case REBOOT_HALT:
 1485                 bsd_args.opt = RB_HALT;
 1486                 break;
 1487         case REBOOT_RESTART:
 1488         case REBOOT_RESTART2:
 1489                 bsd_args.opt = 0;
 1490                 break;
 1491         case REBOOT_POWEROFF:
 1492                 bsd_args.opt = RB_POWEROFF;
 1493                 break;
 1494         default:
 1495                 return EINVAL;
 1496         }
 1497         return reboot(td, &bsd_args);
 1498 }
 1499 
 1500 
 1501 /*
 1502  * The FreeBSD native getpid(2), getgid(2) and getuid(2) also modify
 1503  * td->td_retval[1] when COMPAT_43 is defined. This clobbers registers that
 1504  * are assumed to be preserved. The following lightweight syscalls fixes
 1505  * this. See also linux_getgid16() and linux_getuid16() in linux_uid16.c
 1506  *
 1507  * linux_getpid() - MP SAFE
 1508  * linux_getgid() - MP SAFE
 1509  * linux_getuid() - MP SAFE
 1510  */
 1511 
 1512 int
 1513 linux_getpid(struct thread *td, struct linux_getpid_args *args)
 1514 {
 1515         struct linux_emuldata *em;
 1516 
 1517 #ifdef DEBUG
 1518         if (ldebug(getpid))
 1519                 printf(ARGS(getpid, ""));
 1520 #endif
 1521 
 1522         if (linux_use26(td)) {
 1523                 em = em_find(td->td_proc, EMUL_DONTLOCK);
 1524                 KASSERT(em != NULL, ("getpid: emuldata not found.\n"));
 1525                 td->td_retval[0] = em->shared->group_pid;
 1526         } else {
 1527                 td->td_retval[0] = td->td_proc->p_pid;
 1528         }
 1529 
 1530         return (0);
 1531 }
 1532 
 1533 int
 1534 linux_gettid(struct thread *td, struct linux_gettid_args *args)
 1535 {
 1536 
 1537 #ifdef DEBUG
 1538         if (ldebug(gettid))
 1539                 printf(ARGS(gettid, ""));
 1540 #endif
 1541 
 1542         td->td_retval[0] = td->td_proc->p_pid;
 1543         return (0);
 1544 }
 1545 
 1546 
 1547 int
 1548 linux_getppid(struct thread *td, struct linux_getppid_args *args)
 1549 {
 1550         struct linux_emuldata *em;
 1551         struct proc *p, *pp;
 1552 
 1553 #ifdef DEBUG
 1554         if (ldebug(getppid))
 1555                 printf(ARGS(getppid, ""));
 1556 #endif
 1557 
 1558         if (!linux_use26(td)) {
 1559                 PROC_LOCK(td->td_proc);
 1560                 td->td_retval[0] = td->td_proc->p_pptr->p_pid;
 1561                 PROC_UNLOCK(td->td_proc);
 1562                 return (0);
 1563         }
 1564 
 1565         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1566 
 1567         KASSERT(em != NULL, ("getppid: process emuldata not found.\n"));
 1568 
 1569         /* find the group leader */
 1570         p = pfind(em->shared->group_pid);
 1571 
 1572         if (p == NULL) {
 1573 #ifdef DEBUG
 1574                 printf(LMSG("parent process not found.\n"));
 1575 #endif
 1576                 return (0);
 1577         }
 1578 
 1579         pp = p->p_pptr;         /* switch to parent */
 1580         PROC_LOCK(pp);
 1581         PROC_UNLOCK(p);
 1582 
 1583         /* if its also linux process */
 1584         if (pp->p_sysent == &elf_linux_sysvec) {
 1585                 em = em_find(pp, EMUL_DONTLOCK);
 1586                 KASSERT(em != NULL, ("getppid: parent emuldata not found.\n"));
 1587 
 1588                 td->td_retval[0] = em->shared->group_pid;
 1589         } else
 1590                 td->td_retval[0] = pp->p_pid;
 1591 
 1592         PROC_UNLOCK(pp);
 1593 
 1594         return (0);
 1595 }
 1596 
 1597 int
 1598 linux_getgid(struct thread *td, struct linux_getgid_args *args)
 1599 {
 1600 
 1601 #ifdef DEBUG
 1602         if (ldebug(getgid))
 1603                 printf(ARGS(getgid, ""));
 1604 #endif
 1605 
 1606         td->td_retval[0] = td->td_ucred->cr_rgid;
 1607         return (0);
 1608 }
 1609 
 1610 int
 1611 linux_getuid(struct thread *td, struct linux_getuid_args *args)
 1612 {
 1613 
 1614 #ifdef DEBUG
 1615         if (ldebug(getuid))
 1616                 printf(ARGS(getuid, ""));
 1617 #endif
 1618 
 1619         td->td_retval[0] = td->td_ucred->cr_ruid;
 1620         return (0);
 1621 }
 1622 
 1623 
 1624 int
 1625 linux_getsid(struct thread *td, struct linux_getsid_args *args)
 1626 {
 1627         struct getsid_args bsd;
 1628 
 1629 #ifdef DEBUG
 1630         if (ldebug(getsid))
 1631                 printf(ARGS(getsid, "%i"), args->pid);
 1632 #endif
 1633 
 1634         bsd.pid = args->pid;
 1635         return getsid(td, &bsd);
 1636 }
 1637 
 1638 int
 1639 linux_nosys(struct thread *td, struct nosys_args *ignore)
 1640 {
 1641 
 1642         return (ENOSYS);
 1643 }
 1644 
 1645 int
 1646 linux_getpriority(struct thread *td, struct linux_getpriority_args *args)
 1647 {
 1648         struct getpriority_args bsd_args;
 1649         int error;
 1650 
 1651 #ifdef DEBUG
 1652         if (ldebug(getpriority))
 1653                 printf(ARGS(getpriority, "%i, %i"), args->which, args->who);
 1654 #endif
 1655 
 1656         bsd_args.which = args->which;
 1657         bsd_args.who = args->who;
 1658         error = getpriority(td, &bsd_args);
 1659         td->td_retval[0] = 20 - td->td_retval[0];
 1660         return error;
 1661 }
 1662 
 1663 int
 1664 linux_sethostname(struct thread *td, struct linux_sethostname_args *args)
 1665 {
 1666         int name[2];
 1667 
 1668 #ifdef DEBUG
 1669         if (ldebug(sethostname))
 1670                 printf(ARGS(sethostname, "*, %i"), args->len);
 1671 #endif
 1672 
 1673         name[0] = CTL_KERN;
 1674         name[1] = KERN_HOSTNAME;
 1675         return (userland_sysctl(td, name, 2, 0, 0, 0, args->hostname,
 1676             args->len, 0, 0));
 1677 }
 1678 
 1679 int
 1680 linux_setdomainname(struct thread *td, struct linux_setdomainname_args *args)
 1681 {
 1682         int name[2];
 1683 
 1684 #ifdef DEBUG
 1685         if (ldebug(setdomainname))
 1686                 printf(ARGS(setdomainname, "*, %i"), args->len);
 1687 #endif
 1688 
 1689         name[0] = CTL_KERN;
 1690         name[1] = KERN_NISDOMAINNAME;
 1691         return (userland_sysctl(td, name, 2, 0, 0, 0, args->name,
 1692             args->len, 0, 0));
 1693 }
 1694 
 1695 int
 1696 linux_exit_group(struct thread *td, struct linux_exit_group_args *args)
 1697 {
 1698         struct linux_emuldata *em, *td_em, *tmp_em;
 1699         struct proc *sp;
 1700 
 1701 #ifdef DEBUG
 1702         if (ldebug(exit_group))
 1703                 printf(ARGS(exit_group, "%i"), args->error_code);
 1704 #endif
 1705 
 1706         if (linux_use26(td)) {
 1707                 td_em = em_find(td->td_proc, EMUL_DONTLOCK);
 1708 
 1709                 KASSERT(td_em != NULL, ("exit_group: emuldata not found.\n"));
 1710 
 1711                 EMUL_SHARED_RLOCK(&emul_shared_lock);
 1712                 LIST_FOREACH_SAFE(em, &td_em->shared->threads, threads, tmp_em) {
 1713                         if (em->pid == td_em->pid)
 1714                                 continue;
 1715 
 1716                         sp = pfind(em->pid);
 1717                         psignal(sp, SIGKILL);
 1718                         PROC_UNLOCK(sp);
 1719 #ifdef DEBUG
 1720                         printf(LMSG("linux_sys_exit_group: kill PID %d\n"), em->pid);
 1721 #endif
 1722                 }
 1723 
 1724                 EMUL_SHARED_RUNLOCK(&emul_shared_lock);
 1725         }
 1726         /*
 1727          * XXX: we should send a signal to the parent if
 1728          * SIGNAL_EXIT_GROUP is set. We ignore that (temporarily?)
 1729          * as it doesnt occur often.
 1730          */
 1731         exit1(td, W_EXITCODE(args->error_code, 0));
 1732 
 1733         return (0);
 1734 }
 1735 
 1736 int
 1737 linux_prctl(struct thread *td, struct linux_prctl_args *args)
 1738 {
 1739         int error = 0, max_size;
 1740         struct proc *p = td->td_proc;
 1741         char comm[LINUX_MAX_COMM_LEN];
 1742         struct linux_emuldata *em;
 1743         int pdeath_signal;
 1744 
 1745 #ifdef DEBUG
 1746         if (ldebug(prctl))
 1747                 printf(ARGS(prctl, "%d, %d, %d, %d, %d"), args->option,
 1748                     args->arg2, args->arg3, args->arg4, args->arg5);
 1749 #endif
 1750 
 1751         switch (args->option) {
 1752         case LINUX_PR_SET_PDEATHSIG:
 1753                 if (!LINUX_SIG_VALID(args->arg2))
 1754                         return (EINVAL);
 1755                 em = em_find(p, EMUL_DOLOCK);
 1756                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1757                 em->pdeath_signal = args->arg2;
 1758                 EMUL_UNLOCK(&emul_lock);
 1759                 break;
 1760         case LINUX_PR_GET_PDEATHSIG:
 1761                 em = em_find(p, EMUL_DOLOCK);
 1762                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1763                 pdeath_signal = em->pdeath_signal;
 1764                 EMUL_UNLOCK(&emul_lock);
 1765                 error = copyout(&pdeath_signal,
 1766                     (void *)(register_t)args->arg2,
 1767                     sizeof(pdeath_signal));
 1768                 break;
 1769         case LINUX_PR_SET_NAME:
 1770                 /*
 1771                  * To be on the safe side we need to make sure to not
 1772                  * overflow the size a linux program expects. We already
 1773                  * do this here in the copyin, so that we don't need to
 1774                  * check on copyout.
 1775                  */
 1776                 max_size = MIN(sizeof(comm), sizeof(p->p_comm));
 1777                 error = copyinstr((void *)(register_t)args->arg2, comm,
 1778                     max_size, NULL);
 1779 
 1780                 /* Linux silently truncates the name if it is too long. */
 1781                 if (error == ENAMETOOLONG) {
 1782                         /*
 1783                          * XXX: copyinstr() isn't documented to populate the
 1784                          * array completely, so do a copyin() to be on the
 1785                          * safe side. This should be changed in case
 1786                          * copyinstr() is changed to guarantee this.
 1787                          */
 1788                         error = copyin((void *)(register_t)args->arg2, comm,
 1789                             max_size - 1);
 1790                         comm[max_size - 1] = '\0';
 1791                 }
 1792                 if (error)
 1793                         return (error);
 1794 
 1795                 PROC_LOCK(p);
 1796                 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
 1797                 PROC_UNLOCK(p);
 1798                 break;
 1799         case LINUX_PR_GET_NAME:
 1800                 PROC_LOCK(p);
 1801                 strlcpy(comm, p->p_comm, sizeof(comm));
 1802                 PROC_UNLOCK(p);
 1803                 error = copyout(comm, (void *)(register_t)args->arg2,
 1804                     strlen(comm) + 1);
 1805                 break;
 1806         default:
 1807                 error = EINVAL;
 1808                 break;
 1809         }
 1810 
 1811         return (error);
 1812 }
 1813 
 1814 /*
 1815  * Get affinity of a process.
 1816  */
 1817 int
 1818 linux_sched_getaffinity(struct thread *td,
 1819     struct linux_sched_getaffinity_args *args)
 1820 {
 1821         int error;
 1822         struct cpuset_getaffinity_args cga;
 1823 
 1824 #ifdef DEBUG
 1825         if (ldebug(sched_getaffinity))
 1826                 printf(ARGS(sched_getaffinity, "%d, %d, *"), args->pid,
 1827                     args->len);
 1828 #endif
 1829         if (args->len < sizeof(cpuset_t))
 1830                 return (EINVAL);
 1831 
 1832         cga.level = CPU_LEVEL_WHICH;
 1833         cga.which = CPU_WHICH_PID;
 1834         cga.id = args->pid;
 1835         cga.cpusetsize = sizeof(cpuset_t);
 1836         cga.mask = (cpuset_t *) args->user_mask_ptr;
 1837 
 1838         if ((error = cpuset_getaffinity(td, &cga)) == 0)
 1839                 td->td_retval[0] = sizeof(cpuset_t);
 1840 
 1841         return (error);
 1842 }
 1843 
 1844 /*
 1845  *  Set affinity of a process.
 1846  */
 1847 int
 1848 linux_sched_setaffinity(struct thread *td,
 1849     struct linux_sched_setaffinity_args *args)
 1850 {
 1851         struct cpuset_setaffinity_args csa;
 1852 
 1853 #ifdef DEBUG
 1854         if (ldebug(sched_setaffinity))
 1855                 printf(ARGS(sched_setaffinity, "%d, %d, *"), args->pid,
 1856                     args->len);
 1857 #endif
 1858         if (args->len < sizeof(cpuset_t))
 1859                 return (EINVAL);
 1860 
 1861         csa.level = CPU_LEVEL_WHICH;
 1862         csa.which = CPU_WHICH_PID;
 1863         csa.id = args->pid;
 1864         csa.cpusetsize = sizeof(cpuset_t);
 1865         csa.mask = (cpuset_t *) args->user_mask_ptr;
 1866 
 1867         return (cpuset_setaffinity(td, &csa));
 1868 }

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