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/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("$FreeBSD$");
   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 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
   96         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
   97         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE,
   98         RLIMIT_MEMLOCK, RLIMIT_AS 
   99 };
  100 
  101 struct l_sysinfo {
  102         l_long          uptime;         /* Seconds since boot */
  103         l_ulong         loads[3];       /* 1, 5, and 15 minute load averages */
  104 #define LINUX_SYSINFO_LOADS_SCALE 65536
  105         l_ulong         totalram;       /* Total usable main memory size */
  106         l_ulong         freeram;        /* Available memory size */
  107         l_ulong         sharedram;      /* Amount of shared memory */
  108         l_ulong         bufferram;      /* Memory used by buffers */
  109         l_ulong         totalswap;      /* Total swap space size */
  110         l_ulong         freeswap;       /* swap space still available */
  111         l_ushort        procs;          /* Number of current processes */
  112         l_ushort        pads;
  113         l_ulong         totalbig;
  114         l_ulong         freebig;
  115         l_uint          mem_unit;
  116         char            _f[20-2*sizeof(l_long)-sizeof(l_int)];  /* padding */
  117 };
  118 int
  119 linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
  120 {
  121         struct l_sysinfo sysinfo;
  122         vm_object_t object;
  123         int i, j;
  124         struct timespec ts;
  125 
  126         getnanouptime(&ts);
  127         if (ts.tv_nsec != 0)
  128                 ts.tv_sec++;
  129         sysinfo.uptime = ts.tv_sec;
  130 
  131         /* Use the information from the mib to get our load averages */
  132         for (i = 0; i < 3; i++)
  133                 sysinfo.loads[i] = averunnable.ldavg[i] *
  134                     LINUX_SYSINFO_LOADS_SCALE / averunnable.fscale;
  135 
  136         sysinfo.totalram = physmem * PAGE_SIZE;
  137         sysinfo.freeram = sysinfo.totalram - cnt.v_wire_count * PAGE_SIZE;
  138 
  139         sysinfo.sharedram = 0;
  140         mtx_lock(&vm_object_list_mtx);
  141         TAILQ_FOREACH(object, &vm_object_list, object_list)
  142                 if (object->shadow_count > 1)
  143                         sysinfo.sharedram += object->resident_page_count;
  144         mtx_unlock(&vm_object_list_mtx);
  145 
  146         sysinfo.sharedram *= PAGE_SIZE;
  147         sysinfo.bufferram = 0;
  148 
  149         swap_pager_status(&i, &j);
  150         sysinfo.totalswap = i * PAGE_SIZE;
  151         sysinfo.freeswap = (i - j) * PAGE_SIZE;
  152 
  153         sysinfo.procs = nprocs;
  154 
  155         /* The following are only present in newer Linux kernels. */
  156         sysinfo.totalbig = 0;
  157         sysinfo.freebig = 0;
  158         sysinfo.mem_unit = 1;
  159 
  160         return (copyout(&sysinfo, args->info, sizeof(sysinfo)));
  161 }
  162 
  163 int
  164 linux_alarm(struct thread *td, struct linux_alarm_args *args)
  165 {
  166         struct itimerval it, old_it;
  167         u_int secs;
  168         int error;
  169 
  170 #ifdef DEBUG
  171         if (ldebug(alarm))
  172                 printf(ARGS(alarm, "%u"), args->secs);
  173 #endif
  174         
  175         secs = args->secs;
  176 
  177         if (secs > INT_MAX)
  178                 secs = INT_MAX;
  179 
  180         it.it_value.tv_sec = (long) secs;
  181         it.it_value.tv_usec = 0;
  182         it.it_interval.tv_sec = 0;
  183         it.it_interval.tv_usec = 0;
  184         error = kern_setitimer(td, ITIMER_REAL, &it, &old_it);
  185         if (error)
  186                 return (error);
  187         if (timevalisset(&old_it.it_value)) {
  188                 if (old_it.it_value.tv_usec != 0)
  189                         old_it.it_value.tv_sec++;
  190                 td->td_retval[0] = old_it.it_value.tv_sec;
  191         }
  192         return (0);
  193 }
  194 
  195 int
  196 linux_brk(struct thread *td, struct linux_brk_args *args)
  197 {
  198         struct vmspace *vm = td->td_proc->p_vmspace;
  199         vm_offset_t new, old;
  200         struct obreak_args /* {
  201                 char * nsize;
  202         } */ tmp;
  203 
  204 #ifdef DEBUG
  205         if (ldebug(brk))
  206                 printf(ARGS(brk, "%p"), (void *)(uintptr_t)args->dsend);
  207 #endif
  208         old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
  209         new = (vm_offset_t)args->dsend;
  210         tmp.nsize = (char *)new;
  211         if (((caddr_t)new > vm->vm_daddr) && !obreak(td, &tmp))
  212                 td->td_retval[0] = (long)new;
  213         else
  214                 td->td_retval[0] = (long)old;
  215 
  216         return (0);
  217 }
  218 
  219 #if defined(__i386__)
  220 /* XXX: what about amd64/linux32? */
  221 
  222 int
  223 linux_uselib(struct thread *td, struct linux_uselib_args *args)
  224 {
  225         struct nameidata ni;
  226         struct vnode *vp;
  227         struct exec *a_out;
  228         struct vattr attr;
  229         vm_offset_t vmaddr;
  230         unsigned long file_offset;
  231         vm_offset_t buffer;
  232         unsigned long bss_size;
  233         char *library;
  234         int error;
  235         int locked, vfslocked;
  236 
  237         LCONVPATHEXIST(td, args->library, &library);
  238 
  239 #ifdef DEBUG
  240         if (ldebug(uselib))
  241                 printf(ARGS(uselib, "%s"), library);
  242 #endif
  243 
  244         a_out = NULL;
  245         vfslocked = 0;
  246         locked = 0;
  247         vp = NULL;
  248 
  249         NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
  250             UIO_SYSSPACE, library, td);
  251         error = namei(&ni);
  252         LFREEPATH(library);
  253         if (error)
  254                 goto cleanup;
  255 
  256         vp = ni.ni_vp;
  257         vfslocked = NDHASGIANT(&ni);
  258         NDFREE(&ni, NDF_ONLY_PNBUF);
  259 
  260         /*
  261          * From here on down, we have a locked vnode that must be unlocked.
  262          * XXX: The code below largely duplicates exec_check_permissions().
  263          */
  264         locked = 1;
  265 
  266         /* Writable? */
  267         if (vp->v_writecount) {
  268                 error = ETXTBSY;
  269                 goto cleanup;
  270         }
  271 
  272         /* Executable? */
  273         error = VOP_GETATTR(vp, &attr, td->td_ucred);
  274         if (error)
  275                 goto cleanup;
  276 
  277         if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
  278             ((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) {
  279                 /* EACCESS is what exec(2) returns. */
  280                 error = ENOEXEC;
  281                 goto cleanup;
  282         }
  283 
  284         /* Sensible size? */
  285         if (attr.va_size == 0) {
  286                 error = ENOEXEC;
  287                 goto cleanup;
  288         }
  289 
  290         /* Can we access it? */
  291         error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
  292         if (error)
  293                 goto cleanup;
  294 
  295         /*
  296          * XXX: This should use vn_open() so that it is properly authorized,
  297          * and to reduce code redundancy all over the place here.
  298          * XXX: Not really, it duplicates far more of exec_check_permissions()
  299          * than vn_open().
  300          */
  301 #ifdef MAC
  302         error = mac_vnode_check_open(td->td_ucred, vp, VREAD);
  303         if (error)
  304                 goto cleanup;
  305 #endif
  306         error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
  307         if (error)
  308                 goto cleanup;
  309 
  310         /* Pull in executable header into kernel_map */
  311         error = vm_mmap(kernel_map, (vm_offset_t *)&a_out, PAGE_SIZE,
  312             VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0);
  313         if (error)
  314                 goto cleanup;
  315 
  316         /* Is it a Linux binary ? */
  317         if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
  318                 error = ENOEXEC;
  319                 goto cleanup;
  320         }
  321 
  322         /*
  323          * While we are here, we should REALLY do some more checks
  324          */
  325 
  326         /* Set file/virtual offset based on a.out variant. */
  327         switch ((int)(a_out->a_magic & 0xffff)) {
  328         case 0413:                      /* ZMAGIC */
  329                 file_offset = 1024;
  330                 break;
  331         case 0314:                      /* QMAGIC */
  332                 file_offset = 0;
  333                 break;
  334         default:
  335                 error = ENOEXEC;
  336                 goto cleanup;
  337         }
  338 
  339         bss_size = round_page(a_out->a_bss);
  340 
  341         /* Check various fields in header for validity/bounds. */
  342         if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
  343                 error = ENOEXEC;
  344                 goto cleanup;
  345         }
  346 
  347         /* text + data can't exceed file size */
  348         if (a_out->a_data + a_out->a_text > attr.va_size) {
  349                 error = EFAULT;
  350                 goto cleanup;
  351         }
  352 
  353         /*
  354          * text/data/bss must not exceed limits
  355          * XXX - this is not complete. it should check current usage PLUS
  356          * the resources needed by this library.
  357          */
  358         PROC_LOCK(td->td_proc);
  359         if (a_out->a_text > maxtsiz ||
  360             a_out->a_data + bss_size > lim_cur(td->td_proc, RLIMIT_DATA)) {
  361                 PROC_UNLOCK(td->td_proc);
  362                 error = ENOMEM;
  363                 goto cleanup;
  364         }
  365         PROC_UNLOCK(td->td_proc);
  366 
  367         /*
  368          * Prevent more writers.
  369          * XXX: Note that if any of the VM operations fail below we don't
  370          * clear this flag.
  371          */
  372         vp->v_vflag |= VV_TEXT;
  373 
  374         /*
  375          * Lock no longer needed
  376          */
  377         locked = 0;
  378         VOP_UNLOCK(vp, 0);
  379         VFS_UNLOCK_GIANT(vfslocked);
  380 
  381         /*
  382          * Check if file_offset page aligned. Currently we cannot handle
  383          * misalinged file offsets, and so we read in the entire image
  384          * (what a waste).
  385          */
  386         if (file_offset & PAGE_MASK) {
  387 #ifdef DEBUG
  388                 printf("uselib: Non page aligned binary %lu\n", file_offset);
  389 #endif
  390                 /* Map text+data read/write/execute */
  391 
  392                 /* a_entry is the load address and is page aligned */
  393                 vmaddr = trunc_page(a_out->a_entry);
  394 
  395                 /* get anon user mapping, read+write+execute */
  396                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  397                     &vmaddr, a_out->a_text + a_out->a_data, FALSE, VM_PROT_ALL,
  398                     VM_PROT_ALL, 0);
  399                 if (error)
  400                         goto cleanup;
  401 
  402                 /* map file into kernel_map */
  403                 error = vm_mmap(kernel_map, &buffer,
  404                     round_page(a_out->a_text + a_out->a_data + file_offset),
  405                     VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp,
  406                     trunc_page(file_offset));
  407                 if (error)
  408                         goto cleanup;
  409 
  410                 /* copy from kernel VM space to user space */
  411                 error = copyout(PTRIN(buffer + file_offset),
  412                     (void *)vmaddr, a_out->a_text + a_out->a_data);
  413 
  414                 /* release temporary kernel space */
  415                 vm_map_remove(kernel_map, buffer, buffer +
  416                     round_page(a_out->a_text + a_out->a_data + file_offset));
  417 
  418                 if (error)
  419                         goto cleanup;
  420         } else {
  421 #ifdef DEBUG
  422                 printf("uselib: Page aligned binary %lu\n", file_offset);
  423 #endif
  424                 /*
  425                  * for QMAGIC, a_entry is 20 bytes beyond the load address
  426                  * to skip the executable header
  427                  */
  428                 vmaddr = trunc_page(a_out->a_entry);
  429 
  430                 /*
  431                  * Map it all into the process's space as a single
  432                  * copy-on-write "data" segment.
  433                  */
  434                 error = vm_mmap(&td->td_proc->p_vmspace->vm_map, &vmaddr,
  435                     a_out->a_text + a_out->a_data, VM_PROT_ALL, VM_PROT_ALL,
  436                     MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, file_offset);
  437                 if (error)
  438                         goto cleanup;
  439         }
  440 #ifdef DEBUG
  441         printf("mem=%08lx = %08lx %08lx\n", (long)vmaddr, ((long *)vmaddr)[0],
  442             ((long *)vmaddr)[1]);
  443 #endif
  444         if (bss_size != 0) {
  445                 /* Calculate BSS start address */
  446                 vmaddr = trunc_page(a_out->a_entry) + a_out->a_text +
  447                     a_out->a_data;
  448 
  449                 /* allocate some 'anon' space */
  450                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  451                     &vmaddr, bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
  452                 if (error)
  453                         goto cleanup;
  454         }
  455 
  456 cleanup:
  457         /* Unlock vnode if needed */
  458         if (locked) {
  459                 VOP_UNLOCK(vp, 0);
  460                 VFS_UNLOCK_GIANT(vfslocked);
  461         }
  462 
  463         /* Release the kernel mapping. */
  464         if (a_out)
  465                 vm_map_remove(kernel_map, (vm_offset_t)a_out,
  466                     (vm_offset_t)a_out + PAGE_SIZE);
  467 
  468         return (error);
  469 }
  470 
  471 #endif  /* __i386__ */
  472 
  473 int
  474 linux_select(struct thread *td, struct linux_select_args *args)
  475 {
  476         l_timeval ltv;
  477         struct timeval tv0, tv1, utv, *tvp;
  478         int error;
  479 
  480 #ifdef DEBUG
  481         if (ldebug(select))
  482                 printf(ARGS(select, "%d, %p, %p, %p, %p"), args->nfds,
  483                     (void *)args->readfds, (void *)args->writefds,
  484                     (void *)args->exceptfds, (void *)args->timeout);
  485 #endif
  486 
  487         /*
  488          * Store current time for computation of the amount of
  489          * time left.
  490          */
  491         if (args->timeout) {
  492                 if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
  493                         goto select_out;
  494                 utv.tv_sec = ltv.tv_sec;
  495                 utv.tv_usec = ltv.tv_usec;
  496 #ifdef DEBUG
  497                 if (ldebug(select))
  498                         printf(LMSG("incoming timeout (%jd/%ld)"),
  499                             (intmax_t)utv.tv_sec, utv.tv_usec);
  500 #endif
  501 
  502                 if (itimerfix(&utv)) {
  503                         /*
  504                          * The timeval was invalid.  Convert it to something
  505                          * valid that will act as it does under Linux.
  506                          */
  507                         utv.tv_sec += utv.tv_usec / 1000000;
  508                         utv.tv_usec %= 1000000;
  509                         if (utv.tv_usec < 0) {
  510                                 utv.tv_sec -= 1;
  511                                 utv.tv_usec += 1000000;
  512                         }
  513                         if (utv.tv_sec < 0)
  514                                 timevalclear(&utv);
  515                 }
  516                 microtime(&tv0);
  517                 tvp = &utv;
  518         } else
  519                 tvp = NULL;
  520 
  521         error = kern_select(td, args->nfds, args->readfds, args->writefds,
  522             args->exceptfds, tvp, sizeof(l_int) * 8);
  523 
  524 #ifdef DEBUG
  525         if (ldebug(select))
  526                 printf(LMSG("real select returns %d"), error);
  527 #endif
  528         if (error)
  529                 goto select_out;
  530 
  531         if (args->timeout) {
  532                 if (td->td_retval[0]) {
  533                         /*
  534                          * Compute how much time was left of the timeout,
  535                          * by subtracting the current time and the time
  536                          * before we started the call, and subtracting
  537                          * that result from the user-supplied value.
  538                          */
  539                         microtime(&tv1);
  540                         timevalsub(&tv1, &tv0);
  541                         timevalsub(&utv, &tv1);
  542                         if (utv.tv_sec < 0)
  543                                 timevalclear(&utv);
  544                 } else
  545                         timevalclear(&utv);
  546 #ifdef DEBUG
  547                 if (ldebug(select))
  548                         printf(LMSG("outgoing timeout (%jd/%ld)"),
  549                             (intmax_t)utv.tv_sec, utv.tv_usec);
  550 #endif
  551                 ltv.tv_sec = utv.tv_sec;
  552                 ltv.tv_usec = utv.tv_usec;
  553                 if ((error = copyout(&ltv, args->timeout, sizeof(ltv))))
  554                         goto select_out;
  555         }
  556 
  557 select_out:
  558 #ifdef DEBUG
  559         if (ldebug(select))
  560                 printf(LMSG("select_out -> %d"), error);
  561 #endif
  562         return (error);
  563 }
  564 
  565 int
  566 linux_mremap(struct thread *td, struct linux_mremap_args *args)
  567 {
  568         struct munmap_args /* {
  569                 void *addr;
  570                 size_t len;
  571         } */ bsd_args;
  572         int error = 0;
  573 
  574 #ifdef DEBUG
  575         if (ldebug(mremap))
  576                 printf(ARGS(mremap, "%p, %08lx, %08lx, %08lx"),
  577                     (void *)(uintptr_t)args->addr,
  578                     (unsigned long)args->old_len,
  579                     (unsigned long)args->new_len,
  580                     (unsigned long)args->flags);
  581 #endif
  582 
  583         if (args->flags & ~(LINUX_MREMAP_FIXED | LINUX_MREMAP_MAYMOVE)) {
  584                 td->td_retval[0] = 0;
  585                 return (EINVAL);
  586         }
  587 
  588         /*
  589          * Check for the page alignment.
  590          * Linux defines PAGE_MASK to be FreeBSD ~PAGE_MASK.
  591          */
  592         if (args->addr & PAGE_MASK) {
  593                 td->td_retval[0] = 0;
  594                 return (EINVAL);
  595         }
  596 
  597         args->new_len = round_page(args->new_len);
  598         args->old_len = round_page(args->old_len);
  599 
  600         if (args->new_len > args->old_len) {
  601                 td->td_retval[0] = 0;
  602                 return (ENOMEM);
  603         }
  604 
  605         if (args->new_len < args->old_len) {
  606                 bsd_args.addr =
  607                     (caddr_t)((uintptr_t)args->addr + args->new_len);
  608                 bsd_args.len = args->old_len - args->new_len;
  609                 error = munmap(td, &bsd_args);
  610         }
  611 
  612         td->td_retval[0] = error ? 0 : (uintptr_t)args->addr;
  613         return (error);
  614 }
  615 
  616 #define LINUX_MS_ASYNC       0x0001
  617 #define LINUX_MS_INVALIDATE  0x0002
  618 #define LINUX_MS_SYNC        0x0004
  619 
  620 int
  621 linux_msync(struct thread *td, struct linux_msync_args *args)
  622 {
  623         struct msync_args bsd_args;
  624 
  625         bsd_args.addr = (caddr_t)(uintptr_t)args->addr;
  626         bsd_args.len = (uintptr_t)args->len;
  627         bsd_args.flags = args->fl & ~LINUX_MS_SYNC;
  628 
  629         return (msync(td, &bsd_args));
  630 }
  631 
  632 int
  633 linux_time(struct thread *td, struct linux_time_args *args)
  634 {
  635         struct timeval tv;
  636         l_time_t tm;
  637         int error;
  638 
  639 #ifdef DEBUG
  640         if (ldebug(time))
  641                 printf(ARGS(time, "*"));
  642 #endif
  643 
  644         microtime(&tv);
  645         tm = tv.tv_sec;
  646         if (args->tm && (error = copyout(&tm, args->tm, sizeof(tm))))
  647                 return (error);
  648         td->td_retval[0] = tm;
  649         return (0);
  650 }
  651 
  652 struct l_times_argv {
  653         l_clock_t       tms_utime;
  654         l_clock_t       tms_stime;
  655         l_clock_t       tms_cutime;
  656         l_clock_t       tms_cstime;
  657 };
  658 
  659 
  660 /*
  661  * Glibc versions prior to 2.2.1 always use hard-coded CLK_TCK value.
  662  * Since 2.2.1 Glibc uses value exported from kernel via AT_CLKTCK
  663  * auxiliary vector entry.
  664  */
  665 #define CLK_TCK         100
  666 
  667 #define CONVOTCK(r)     (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  668 #define CONVNTCK(r)     (r.tv_sec * stclohz + r.tv_usec / (1000000 / stclohz))
  669 
  670 #define CONVTCK(r)      (linux_kernver(td) >= LINUX_KERNVER_2004000 ?           \
  671                             CONVNTCK(r) : CONVOTCK(r))
  672 
  673 int
  674 linux_times(struct thread *td, struct linux_times_args *args)
  675 {
  676         struct timeval tv, utime, stime, cutime, cstime;
  677         struct l_times_argv tms;
  678         struct proc *p;
  679         int error;
  680 
  681 #ifdef DEBUG
  682         if (ldebug(times))
  683                 printf(ARGS(times, "*"));
  684 #endif
  685 
  686         if (args->buf != NULL) {
  687                 p = td->td_proc;
  688                 PROC_LOCK(p);
  689                 PROC_SLOCK(p);
  690                 calcru(p, &utime, &stime);
  691                 PROC_SUNLOCK(p);
  692                 calccru(p, &cutime, &cstime);
  693                 PROC_UNLOCK(p);
  694 
  695                 tms.tms_utime = CONVTCK(utime);
  696                 tms.tms_stime = CONVTCK(stime);
  697 
  698                 tms.tms_cutime = CONVTCK(cutime);
  699                 tms.tms_cstime = CONVTCK(cstime);
  700 
  701                 if ((error = copyout(&tms, args->buf, sizeof(tms))))
  702                         return (error);
  703         }
  704 
  705         microuptime(&tv);
  706         td->td_retval[0] = (int)CONVTCK(tv);
  707         return (0);
  708 }
  709 
  710 int
  711 linux_newuname(struct thread *td, struct linux_newuname_args *args)
  712 {
  713         struct l_new_utsname utsname;
  714         char osname[LINUX_MAX_UTSNAME];
  715         char osrelease[LINUX_MAX_UTSNAME];
  716         char *p;
  717 
  718 #ifdef DEBUG
  719         if (ldebug(newuname))
  720                 printf(ARGS(newuname, "*"));
  721 #endif
  722 
  723         linux_get_osname(td, osname);
  724         linux_get_osrelease(td, osrelease);
  725 
  726         bzero(&utsname, sizeof(utsname));
  727         strlcpy(utsname.sysname, osname, LINUX_MAX_UTSNAME);
  728         getcredhostname(td->td_ucred, utsname.nodename, LINUX_MAX_UTSNAME);
  729         getcreddomainname(td->td_ucred, utsname.domainname, LINUX_MAX_UTSNAME);
  730         strlcpy(utsname.release, osrelease, LINUX_MAX_UTSNAME);
  731         strlcpy(utsname.version, version, LINUX_MAX_UTSNAME);
  732         for (p = utsname.version; *p != '\0'; ++p)
  733                 if (*p == '\n') {
  734                         *p = '\0';
  735                         break;
  736                 }
  737         strlcpy(utsname.machine, linux_platform, LINUX_MAX_UTSNAME);
  738 
  739         return (copyout(&utsname, args->buf, sizeof(utsname)));
  740 }
  741 
  742 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  743 struct l_utimbuf {
  744         l_time_t l_actime;
  745         l_time_t l_modtime;
  746 };
  747 
  748 int
  749 linux_utime(struct thread *td, struct linux_utime_args *args)
  750 {
  751         struct timeval tv[2], *tvp;
  752         struct l_utimbuf lut;
  753         char *fname;
  754         int error;
  755 
  756         LCONVPATHEXIST(td, args->fname, &fname);
  757 
  758 #ifdef DEBUG
  759         if (ldebug(utime))
  760                 printf(ARGS(utime, "%s, *"), fname);
  761 #endif
  762 
  763         if (args->times) {
  764                 if ((error = copyin(args->times, &lut, sizeof lut))) {
  765                         LFREEPATH(fname);
  766                         return (error);
  767                 }
  768                 tv[0].tv_sec = lut.l_actime;
  769                 tv[0].tv_usec = 0;
  770                 tv[1].tv_sec = lut.l_modtime;
  771                 tv[1].tv_usec = 0;
  772                 tvp = tv;
  773         } else
  774                 tvp = NULL;
  775 
  776         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  777         LFREEPATH(fname);
  778         return (error);
  779 }
  780 
  781 int
  782 linux_utimes(struct thread *td, struct linux_utimes_args *args)
  783 {
  784         l_timeval ltv[2];
  785         struct timeval tv[2], *tvp = NULL;
  786         char *fname;
  787         int error;
  788 
  789         LCONVPATHEXIST(td, args->fname, &fname);
  790 
  791 #ifdef DEBUG
  792         if (ldebug(utimes))
  793                 printf(ARGS(utimes, "%s, *"), fname);
  794 #endif
  795 
  796         if (args->tptr != NULL) {
  797                 if ((error = copyin(args->tptr, ltv, sizeof ltv))) {
  798                         LFREEPATH(fname);
  799                         return (error);
  800                 }
  801                 tv[0].tv_sec = ltv[0].tv_sec;
  802                 tv[0].tv_usec = ltv[0].tv_usec;
  803                 tv[1].tv_sec = ltv[1].tv_sec;
  804                 tv[1].tv_usec = ltv[1].tv_usec;
  805                 tvp = tv;
  806         }
  807 
  808         error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  809         LFREEPATH(fname);
  810         return (error);
  811 }
  812 
  813 int
  814 linux_futimesat(struct thread *td, struct linux_futimesat_args *args)
  815 {
  816         l_timeval ltv[2];
  817         struct timeval tv[2], *tvp = NULL;
  818         char *fname;
  819         int error, dfd;
  820 
  821         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  822         LCONVPATHEXIST_AT(td, args->filename, &fname, dfd);
  823 
  824 #ifdef DEBUG
  825         if (ldebug(futimesat))
  826                 printf(ARGS(futimesat, "%s, *"), fname);
  827 #endif
  828 
  829         if (args->utimes != NULL) {
  830                 if ((error = copyin(args->utimes, ltv, sizeof ltv))) {
  831                         LFREEPATH(fname);
  832                         return (error);
  833                 }
  834                 tv[0].tv_sec = ltv[0].tv_sec;
  835                 tv[0].tv_usec = ltv[0].tv_usec;
  836                 tv[1].tv_sec = ltv[1].tv_sec;
  837                 tv[1].tv_usec = ltv[1].tv_usec;
  838                 tvp = tv;
  839         }
  840 
  841         error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  842         LFREEPATH(fname);
  843         return (error);
  844 }
  845 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  846 
  847 int
  848 linux_common_wait(struct thread *td, int pid, int *status,
  849     int options, struct rusage *ru)
  850 {
  851         int error, tmpstat;
  852 
  853         error = kern_wait(td, pid, &tmpstat, options, ru);
  854         if (error)
  855                 return (error);
  856 
  857         if (status) {
  858                 tmpstat &= 0xffff;
  859                 if (WIFSIGNALED(tmpstat))
  860                         tmpstat = (tmpstat & 0xffffff80) |
  861                             BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
  862                 else if (WIFSTOPPED(tmpstat))
  863                         tmpstat = (tmpstat & 0xffff00ff) |
  864                             (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
  865                 error = copyout(&tmpstat, status, sizeof(int));
  866         }
  867 
  868         return (error);
  869 }
  870 
  871 int
  872 linux_waitpid(struct thread *td, struct linux_waitpid_args *args)
  873 {
  874         int options;
  875  
  876 #ifdef DEBUG
  877         if (ldebug(waitpid))
  878                 printf(ARGS(waitpid, "%d, %p, %d"),
  879                     args->pid, (void *)args->status, args->options);
  880 #endif
  881         /*
  882          * this is necessary because the test in kern_wait doesn't work
  883          * because we mess with the options here
  884          */
  885         if (args->options & ~(WUNTRACED | WNOHANG | WCONTINUED | __WCLONE))
  886                 return (EINVAL);
  887    
  888         options = (args->options & (WNOHANG | WUNTRACED));
  889         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
  890         if (args->options & __WCLONE)
  891                 options |= WLINUXCLONE;
  892 
  893         return (linux_common_wait(td, args->pid, args->status, options, NULL));
  894 }
  895 
  896 
  897 int
  898 linux_mknod(struct thread *td, struct linux_mknod_args *args)
  899 {
  900         char *path;
  901         int error;
  902 
  903         LCONVPATHCREAT(td, args->path, &path);
  904 
  905 #ifdef DEBUG
  906         if (ldebug(mknod))
  907                 printf(ARGS(mknod, "%s, %d, %d"), path, args->mode, args->dev);
  908 #endif
  909 
  910         switch (args->mode & S_IFMT) {
  911         case S_IFIFO:
  912         case S_IFSOCK:
  913                 error = kern_mkfifo(td, path, UIO_SYSSPACE, args->mode);
  914                 break;
  915 
  916         case S_IFCHR:
  917         case S_IFBLK:
  918                 error = kern_mknod(td, path, UIO_SYSSPACE, args->mode,
  919                     args->dev);
  920                 break;
  921 
  922         case S_IFDIR:
  923                 error = EPERM;
  924                 break;
  925 
  926         case 0:
  927                 args->mode |= S_IFREG;
  928                 /* FALLTHROUGH */
  929         case S_IFREG:
  930                 error = kern_open(td, path, UIO_SYSSPACE,
  931                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  932                 if (error == 0)
  933                         kern_close(td, td->td_retval[0]);
  934                 break;
  935 
  936         default:
  937                 error = EINVAL;
  938                 break;
  939         }
  940         LFREEPATH(path);
  941         return (error);
  942 }
  943 
  944 int
  945 linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
  946 {
  947         char *path;
  948         int error, dfd;
  949 
  950         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  951         LCONVPATHCREAT_AT(td, args->filename, &path, dfd);
  952 
  953 #ifdef DEBUG
  954         if (ldebug(mknodat))
  955                 printf(ARGS(mknodat, "%s, %d, %d"), path, args->mode, args->dev);
  956 #endif
  957 
  958         switch (args->mode & S_IFMT) {
  959         case S_IFIFO:
  960         case S_IFSOCK:
  961                 error = kern_mkfifoat(td, dfd, path, UIO_SYSSPACE, args->mode);
  962                 break;
  963 
  964         case S_IFCHR:
  965         case S_IFBLK:
  966                 error = kern_mknodat(td, dfd, path, UIO_SYSSPACE, args->mode,
  967                     args->dev);
  968                 break;
  969 
  970         case S_IFDIR:
  971                 error = EPERM;
  972                 break;
  973 
  974         case 0:
  975                 args->mode |= S_IFREG;
  976                 /* FALLTHROUGH */
  977         case S_IFREG:
  978                 error = kern_openat(td, dfd, path, UIO_SYSSPACE,
  979                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
  980                 if (error == 0)
  981                         kern_close(td, td->td_retval[0]);
  982                 break;
  983 
  984         default:
  985                 error = EINVAL;
  986                 break;
  987         }
  988         LFREEPATH(path);
  989         return (error);
  990 }
  991 
  992 /*
  993  * UGH! This is just about the dumbest idea I've ever heard!!
  994  */
  995 int
  996 linux_personality(struct thread *td, struct linux_personality_args *args)
  997 {
  998 #ifdef DEBUG
  999         if (ldebug(personality))
 1000                 printf(ARGS(personality, "%lu"), (unsigned long)args->per);
 1001 #endif
 1002         if (args->per != 0)
 1003                 return (EINVAL);
 1004 
 1005         /* Yes Jim, it's still a Linux... */
 1006         td->td_retval[0] = 0;
 1007         return (0);
 1008 }
 1009 
 1010 struct l_itimerval {
 1011         l_timeval it_interval;
 1012         l_timeval it_value;
 1013 };
 1014 
 1015 #define B2L_ITIMERVAL(bip, lip)                                         \
 1016         (bip)->it_interval.tv_sec = (lip)->it_interval.tv_sec;          \
 1017         (bip)->it_interval.tv_usec = (lip)->it_interval.tv_usec;        \
 1018         (bip)->it_value.tv_sec = (lip)->it_value.tv_sec;                \
 1019         (bip)->it_value.tv_usec = (lip)->it_value.tv_usec;
 1020 
 1021 int
 1022 linux_setitimer(struct thread *td, struct linux_setitimer_args *uap)
 1023 {
 1024         int error;
 1025         struct l_itimerval ls;
 1026         struct itimerval aitv, oitv;
 1027 
 1028 #ifdef DEBUG
 1029         if (ldebug(setitimer))
 1030                 printf(ARGS(setitimer, "%p, %p"),
 1031                     (void *)uap->itv, (void *)uap->oitv);
 1032 #endif
 1033 
 1034         if (uap->itv == NULL) {
 1035                 uap->itv = uap->oitv;
 1036                 return (linux_getitimer(td, (struct linux_getitimer_args *)uap));
 1037         }
 1038 
 1039         error = copyin(uap->itv, &ls, sizeof(ls));
 1040         if (error != 0)
 1041                 return (error);
 1042         B2L_ITIMERVAL(&aitv, &ls);
 1043 #ifdef DEBUG
 1044         if (ldebug(setitimer)) {
 1045                 printf("setitimer: value: sec: %jd, usec: %ld\n",
 1046                     (intmax_t)aitv.it_value.tv_sec, aitv.it_value.tv_usec);
 1047                 printf("setitimer: interval: sec: %jd, usec: %ld\n",
 1048                     (intmax_t)aitv.it_interval.tv_sec, aitv.it_interval.tv_usec);
 1049         }
 1050 #endif
 1051         error = kern_setitimer(td, uap->which, &aitv, &oitv);
 1052         if (error != 0 || uap->oitv == NULL)
 1053                 return (error);
 1054         B2L_ITIMERVAL(&ls, &oitv);
 1055 
 1056         return (copyout(&ls, uap->oitv, sizeof(ls)));
 1057 }
 1058 
 1059 int
 1060 linux_getitimer(struct thread *td, struct linux_getitimer_args *uap)
 1061 {
 1062         int error;
 1063         struct l_itimerval ls;
 1064         struct itimerval aitv;
 1065 
 1066 #ifdef DEBUG
 1067         if (ldebug(getitimer))
 1068                 printf(ARGS(getitimer, "%p"), (void *)uap->itv);
 1069 #endif
 1070         error = kern_getitimer(td, uap->which, &aitv);
 1071         if (error != 0)
 1072                 return (error);
 1073         B2L_ITIMERVAL(&ls, &aitv);
 1074         return (copyout(&ls, uap->itv, sizeof(ls)));
 1075 }
 1076 
 1077 int
 1078 linux_nice(struct thread *td, struct linux_nice_args *args)
 1079 {
 1080         struct setpriority_args bsd_args;
 1081 
 1082         bsd_args.which = PRIO_PROCESS;
 1083         bsd_args.who = 0;               /* current process */
 1084         bsd_args.prio = args->inc;
 1085         return (setpriority(td, &bsd_args));
 1086 }
 1087 
 1088 int
 1089 linux_setgroups(struct thread *td, struct linux_setgroups_args *args)
 1090 {
 1091         struct ucred *newcred, *oldcred;
 1092         l_gid_t *linux_gidset;
 1093         gid_t *bsd_gidset;
 1094         int ngrp, error;
 1095         struct proc *p;
 1096 
 1097         ngrp = args->gidsetsize;
 1098         if (ngrp < 0 || ngrp >= ngroups_max + 1)
 1099                 return (EINVAL);
 1100         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK);
 1101         error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t));
 1102         if (error)
 1103                 goto out;
 1104         newcred = crget();
 1105         p = td->td_proc;
 1106         PROC_LOCK(p);
 1107         oldcred = crcopysafe(p, newcred);
 1108 
 1109         /*
 1110          * cr_groups[0] holds egid. Setting the whole set from
 1111          * the supplied set will cause egid to be changed too.
 1112          * Keep cr_groups[0] unchanged to prevent that.
 1113          */
 1114 
 1115         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
 1116                 PROC_UNLOCK(p);
 1117                 crfree(newcred);
 1118                 goto out;
 1119         }
 1120 
 1121         if (ngrp > 0) {
 1122                 newcred->cr_ngroups = ngrp + 1;
 1123 
 1124                 bsd_gidset = newcred->cr_groups;
 1125                 ngrp--;
 1126                 while (ngrp >= 0) {
 1127                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
 1128                         ngrp--;
 1129                 }
 1130         } else
 1131                 newcred->cr_ngroups = 1;
 1132 
 1133         setsugid(p);
 1134         p->p_ucred = newcred;
 1135         PROC_UNLOCK(p);
 1136         crfree(oldcred);
 1137         error = 0;
 1138 out:
 1139         free(linux_gidset, M_TEMP);
 1140         return (error);
 1141 }
 1142 
 1143 int
 1144 linux_getgroups(struct thread *td, struct linux_getgroups_args *args)
 1145 {
 1146         struct ucred *cred;
 1147         l_gid_t *linux_gidset;
 1148         gid_t *bsd_gidset;
 1149         int bsd_gidsetsz, ngrp, error;
 1150 
 1151         cred = td->td_ucred;
 1152         bsd_gidset = cred->cr_groups;
 1153         bsd_gidsetsz = cred->cr_ngroups - 1;
 1154 
 1155         /*
 1156          * cr_groups[0] holds egid. Returning the whole set
 1157          * here will cause a duplicate. Exclude cr_groups[0]
 1158          * to prevent that.
 1159          */
 1160 
 1161         if ((ngrp = args->gidsetsize) == 0) {
 1162                 td->td_retval[0] = bsd_gidsetsz;
 1163                 return (0);
 1164         }
 1165 
 1166         if (ngrp < bsd_gidsetsz)
 1167                 return (EINVAL);
 1168 
 1169         ngrp = 0;
 1170         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
 1171             M_TEMP, M_WAITOK);
 1172         while (ngrp < bsd_gidsetsz) {
 1173                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
 1174                 ngrp++;
 1175         }
 1176 
 1177         error = copyout(linux_gidset, args->grouplist, ngrp * sizeof(l_gid_t));
 1178         free(linux_gidset, M_TEMP);
 1179         if (error)
 1180                 return (error);
 1181 
 1182         td->td_retval[0] = ngrp;
 1183         return (0);
 1184 }
 1185 
 1186 int
 1187 linux_setrlimit(struct thread *td, struct linux_setrlimit_args *args)
 1188 {
 1189         struct rlimit bsd_rlim;
 1190         struct l_rlimit rlim;
 1191         u_int which;
 1192         int error;
 1193 
 1194 #ifdef DEBUG
 1195         if (ldebug(setrlimit))
 1196                 printf(ARGS(setrlimit, "%d, %p"),
 1197                     args->resource, (void *)args->rlim);
 1198 #endif
 1199 
 1200         if (args->resource >= LINUX_RLIM_NLIMITS)
 1201                 return (EINVAL);
 1202 
 1203         which = linux_to_bsd_resource[args->resource];
 1204         if (which == -1)
 1205                 return (EINVAL);
 1206 
 1207         error = copyin(args->rlim, &rlim, sizeof(rlim));
 1208         if (error)
 1209                 return (error);
 1210 
 1211         bsd_rlim.rlim_cur = (rlim_t)rlim.rlim_cur;
 1212         bsd_rlim.rlim_max = (rlim_t)rlim.rlim_max;
 1213         return (kern_setrlimit(td, which, &bsd_rlim));
 1214 }
 1215 
 1216 int
 1217 linux_old_getrlimit(struct thread *td, struct linux_old_getrlimit_args *args)
 1218 {
 1219         struct l_rlimit rlim;
 1220         struct proc *p = td->td_proc;
 1221         struct rlimit bsd_rlim;
 1222         u_int which;
 1223 
 1224 #ifdef DEBUG
 1225         if (ldebug(old_getrlimit))
 1226                 printf(ARGS(old_getrlimit, "%d, %p"),
 1227                     args->resource, (void *)args->rlim);
 1228 #endif
 1229 
 1230         if (args->resource >= LINUX_RLIM_NLIMITS)
 1231                 return (EINVAL);
 1232 
 1233         which = linux_to_bsd_resource[args->resource];
 1234         if (which == -1)
 1235                 return (EINVAL);
 1236 
 1237         PROC_LOCK(p);
 1238         lim_rlimit(p, which, &bsd_rlim);
 1239         PROC_UNLOCK(p);
 1240 
 1241 #ifdef COMPAT_LINUX32
 1242         rlim.rlim_cur = (unsigned int)bsd_rlim.rlim_cur;
 1243         if (rlim.rlim_cur == UINT_MAX)
 1244                 rlim.rlim_cur = INT_MAX;
 1245         rlim.rlim_max = (unsigned int)bsd_rlim.rlim_max;
 1246         if (rlim.rlim_max == UINT_MAX)
 1247                 rlim.rlim_max = INT_MAX;
 1248 #else
 1249         rlim.rlim_cur = (unsigned long)bsd_rlim.rlim_cur;
 1250         if (rlim.rlim_cur == ULONG_MAX)
 1251                 rlim.rlim_cur = LONG_MAX;
 1252         rlim.rlim_max = (unsigned long)bsd_rlim.rlim_max;
 1253         if (rlim.rlim_max == ULONG_MAX)
 1254                 rlim.rlim_max = LONG_MAX;
 1255 #endif
 1256         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1257 }
 1258 
 1259 int
 1260 linux_getrlimit(struct thread *td, struct linux_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(getrlimit))
 1269                 printf(ARGS(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         rlim.rlim_cur = (l_ulong)bsd_rlim.rlim_cur;
 1285         rlim.rlim_max = (l_ulong)bsd_rlim.rlim_max;
 1286         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1287 }
 1288 
 1289 int
 1290 linux_sched_setscheduler(struct thread *td,
 1291     struct linux_sched_setscheduler_args *args)
 1292 {
 1293         struct sched_setscheduler_args bsd;
 1294 
 1295 #ifdef DEBUG
 1296         if (ldebug(sched_setscheduler))
 1297                 printf(ARGS(sched_setscheduler, "%d, %d, %p"),
 1298                     args->pid, args->policy, (const void *)args->param);
 1299 #endif
 1300 
 1301         switch (args->policy) {
 1302         case LINUX_SCHED_OTHER:
 1303                 bsd.policy = SCHED_OTHER;
 1304                 break;
 1305         case LINUX_SCHED_FIFO:
 1306                 bsd.policy = SCHED_FIFO;
 1307                 break;
 1308         case LINUX_SCHED_RR:
 1309                 bsd.policy = SCHED_RR;
 1310                 break;
 1311         default:
 1312                 return (EINVAL);
 1313         }
 1314 
 1315         bsd.pid = args->pid;
 1316         bsd.param = (struct sched_param *)args->param;
 1317         return (sched_setscheduler(td, &bsd));
 1318 }
 1319 
 1320 int
 1321 linux_sched_getscheduler(struct thread *td,
 1322     struct linux_sched_getscheduler_args *args)
 1323 {
 1324         struct sched_getscheduler_args bsd;
 1325         int error;
 1326 
 1327 #ifdef DEBUG
 1328         if (ldebug(sched_getscheduler))
 1329                 printf(ARGS(sched_getscheduler, "%d"), args->pid);
 1330 #endif
 1331 
 1332         bsd.pid = args->pid;
 1333         error = sched_getscheduler(td, &bsd);
 1334 
 1335         switch (td->td_retval[0]) {
 1336         case SCHED_OTHER:
 1337                 td->td_retval[0] = LINUX_SCHED_OTHER;
 1338                 break;
 1339         case SCHED_FIFO:
 1340                 td->td_retval[0] = LINUX_SCHED_FIFO;
 1341                 break;
 1342         case SCHED_RR:
 1343                 td->td_retval[0] = LINUX_SCHED_RR;
 1344                 break;
 1345         }
 1346 
 1347         return (error);
 1348 }
 1349 
 1350 int
 1351 linux_sched_get_priority_max(struct thread *td,
 1352     struct linux_sched_get_priority_max_args *args)
 1353 {
 1354         struct sched_get_priority_max_args bsd;
 1355 
 1356 #ifdef DEBUG
 1357         if (ldebug(sched_get_priority_max))
 1358                 printf(ARGS(sched_get_priority_max, "%d"), args->policy);
 1359 #endif
 1360 
 1361         switch (args->policy) {
 1362         case LINUX_SCHED_OTHER:
 1363                 bsd.policy = SCHED_OTHER;
 1364                 break;
 1365         case LINUX_SCHED_FIFO:
 1366                 bsd.policy = SCHED_FIFO;
 1367                 break;
 1368         case LINUX_SCHED_RR:
 1369                 bsd.policy = SCHED_RR;
 1370                 break;
 1371         default:
 1372                 return (EINVAL);
 1373         }
 1374         return (sched_get_priority_max(td, &bsd));
 1375 }
 1376 
 1377 int
 1378 linux_sched_get_priority_min(struct thread *td,
 1379     struct linux_sched_get_priority_min_args *args)
 1380 {
 1381         struct sched_get_priority_min_args bsd;
 1382 
 1383 #ifdef DEBUG
 1384         if (ldebug(sched_get_priority_min))
 1385                 printf(ARGS(sched_get_priority_min, "%d"), args->policy);
 1386 #endif
 1387 
 1388         switch (args->policy) {
 1389         case LINUX_SCHED_OTHER:
 1390                 bsd.policy = SCHED_OTHER;
 1391                 break;
 1392         case LINUX_SCHED_FIFO:
 1393                 bsd.policy = SCHED_FIFO;
 1394                 break;
 1395         case LINUX_SCHED_RR:
 1396                 bsd.policy = SCHED_RR;
 1397                 break;
 1398         default:
 1399                 return (EINVAL);
 1400         }
 1401         return (sched_get_priority_min(td, &bsd));
 1402 }
 1403 
 1404 #define REBOOT_CAD_ON   0x89abcdef
 1405 #define REBOOT_CAD_OFF  0
 1406 #define REBOOT_HALT     0xcdef0123
 1407 #define REBOOT_RESTART  0x01234567
 1408 #define REBOOT_RESTART2 0xA1B2C3D4
 1409 #define REBOOT_POWEROFF 0x4321FEDC
 1410 #define REBOOT_MAGIC1   0xfee1dead
 1411 #define REBOOT_MAGIC2   0x28121969
 1412 #define REBOOT_MAGIC2A  0x05121996
 1413 #define REBOOT_MAGIC2B  0x16041998
 1414 
 1415 int
 1416 linux_reboot(struct thread *td, struct linux_reboot_args *args)
 1417 {
 1418         struct reboot_args bsd_args;
 1419 
 1420 #ifdef DEBUG
 1421         if (ldebug(reboot))
 1422                 printf(ARGS(reboot, "0x%x"), args->cmd);
 1423 #endif
 1424 
 1425         if (args->magic1 != REBOOT_MAGIC1)
 1426                 return (EINVAL);
 1427 
 1428         switch (args->magic2) {
 1429         case REBOOT_MAGIC2:
 1430         case REBOOT_MAGIC2A:
 1431         case REBOOT_MAGIC2B:
 1432                 break;
 1433         default:
 1434                 return (EINVAL);
 1435         }
 1436 
 1437         switch (args->cmd) {
 1438         case REBOOT_CAD_ON:
 1439         case REBOOT_CAD_OFF:
 1440                 return (priv_check(td, PRIV_REBOOT));
 1441         case REBOOT_HALT:
 1442                 bsd_args.opt = RB_HALT;
 1443                 break;
 1444         case REBOOT_RESTART:
 1445         case REBOOT_RESTART2:
 1446                 bsd_args.opt = 0;
 1447                 break;
 1448         case REBOOT_POWEROFF:
 1449                 bsd_args.opt = RB_POWEROFF;
 1450                 break;
 1451         default:
 1452                 return (EINVAL);
 1453         }
 1454         return (reboot(td, &bsd_args));
 1455 }
 1456 
 1457 
 1458 /*
 1459  * The FreeBSD native getpid(2), getgid(2) and getuid(2) also modify
 1460  * td->td_retval[1] when COMPAT_43 is defined. This clobbers registers that
 1461  * are assumed to be preserved. The following lightweight syscalls fixes
 1462  * this. See also linux_getgid16() and linux_getuid16() in linux_uid16.c
 1463  *
 1464  * linux_getpid() - MP SAFE
 1465  * linux_getgid() - MP SAFE
 1466  * linux_getuid() - MP SAFE
 1467  */
 1468 
 1469 int
 1470 linux_getpid(struct thread *td, struct linux_getpid_args *args)
 1471 {
 1472         struct linux_emuldata *em;
 1473 
 1474 #ifdef DEBUG
 1475         if (ldebug(getpid))
 1476                 printf(ARGS(getpid, ""));
 1477 #endif
 1478 
 1479         if (linux_use26(td)) {
 1480                 em = em_find(td->td_proc, EMUL_DONTLOCK);
 1481                 KASSERT(em != NULL, ("getpid: emuldata not found.\n"));
 1482                 td->td_retval[0] = em->shared->group_pid;
 1483         } else {
 1484                 td->td_retval[0] = td->td_proc->p_pid;
 1485         }
 1486 
 1487         return (0);
 1488 }
 1489 
 1490 int
 1491 linux_gettid(struct thread *td, struct linux_gettid_args *args)
 1492 {
 1493 
 1494 #ifdef DEBUG
 1495         if (ldebug(gettid))
 1496                 printf(ARGS(gettid, ""));
 1497 #endif
 1498 
 1499         td->td_retval[0] = td->td_proc->p_pid;
 1500         return (0);
 1501 }
 1502 
 1503 
 1504 int
 1505 linux_getppid(struct thread *td, struct linux_getppid_args *args)
 1506 {
 1507         struct linux_emuldata *em;
 1508         struct proc *p, *pp;
 1509 
 1510 #ifdef DEBUG
 1511         if (ldebug(getppid))
 1512                 printf(ARGS(getppid, ""));
 1513 #endif
 1514 
 1515         if (!linux_use26(td)) {
 1516                 PROC_LOCK(td->td_proc);
 1517                 td->td_retval[0] = td->td_proc->p_pptr->p_pid;
 1518                 PROC_UNLOCK(td->td_proc);
 1519                 return (0);
 1520         }
 1521 
 1522         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1523 
 1524         KASSERT(em != NULL, ("getppid: process emuldata not found.\n"));
 1525 
 1526         /* find the group leader */
 1527         p = pfind(em->shared->group_pid);
 1528 
 1529         if (p == NULL) {
 1530 #ifdef DEBUG
 1531                 printf(LMSG("parent process not found.\n"));
 1532 #endif
 1533                 return (0);
 1534         }
 1535 
 1536         pp = p->p_pptr;         /* switch to parent */
 1537         PROC_LOCK(pp);
 1538         PROC_UNLOCK(p);
 1539 
 1540         /* if its also linux process */
 1541         if (pp->p_sysent == &elf_linux_sysvec) {
 1542                 em = em_find(pp, EMUL_DONTLOCK);
 1543                 KASSERT(em != NULL, ("getppid: parent emuldata not found.\n"));
 1544 
 1545                 td->td_retval[0] = em->shared->group_pid;
 1546         } else
 1547                 td->td_retval[0] = pp->p_pid;
 1548 
 1549         PROC_UNLOCK(pp);
 1550 
 1551         return (0);
 1552 }
 1553 
 1554 int
 1555 linux_getgid(struct thread *td, struct linux_getgid_args *args)
 1556 {
 1557 
 1558 #ifdef DEBUG
 1559         if (ldebug(getgid))
 1560                 printf(ARGS(getgid, ""));
 1561 #endif
 1562 
 1563         td->td_retval[0] = td->td_ucred->cr_rgid;
 1564         return (0);
 1565 }
 1566 
 1567 int
 1568 linux_getuid(struct thread *td, struct linux_getuid_args *args)
 1569 {
 1570 
 1571 #ifdef DEBUG
 1572         if (ldebug(getuid))
 1573                 printf(ARGS(getuid, ""));
 1574 #endif
 1575 
 1576         td->td_retval[0] = td->td_ucred->cr_ruid;
 1577         return (0);
 1578 }
 1579 
 1580 
 1581 int
 1582 linux_getsid(struct thread *td, struct linux_getsid_args *args)
 1583 {
 1584         struct getsid_args bsd;
 1585 
 1586 #ifdef DEBUG
 1587         if (ldebug(getsid))
 1588                 printf(ARGS(getsid, "%i"), args->pid);
 1589 #endif
 1590 
 1591         bsd.pid = args->pid;
 1592         return (getsid(td, &bsd));
 1593 }
 1594 
 1595 int
 1596 linux_nosys(struct thread *td, struct nosys_args *ignore)
 1597 {
 1598 
 1599         return (ENOSYS);
 1600 }
 1601 
 1602 int
 1603 linux_getpriority(struct thread *td, struct linux_getpriority_args *args)
 1604 {
 1605         struct getpriority_args bsd_args;
 1606         int error;
 1607 
 1608 #ifdef DEBUG
 1609         if (ldebug(getpriority))
 1610                 printf(ARGS(getpriority, "%i, %i"), args->which, args->who);
 1611 #endif
 1612 
 1613         bsd_args.which = args->which;
 1614         bsd_args.who = args->who;
 1615         error = getpriority(td, &bsd_args);
 1616         td->td_retval[0] = 20 - td->td_retval[0];
 1617         return (error);
 1618 }
 1619 
 1620 int
 1621 linux_sethostname(struct thread *td, struct linux_sethostname_args *args)
 1622 {
 1623         int name[2];
 1624 
 1625 #ifdef DEBUG
 1626         if (ldebug(sethostname))
 1627                 printf(ARGS(sethostname, "*, %i"), args->len);
 1628 #endif
 1629 
 1630         name[0] = CTL_KERN;
 1631         name[1] = KERN_HOSTNAME;
 1632         return (userland_sysctl(td, name, 2, 0, 0, 0, args->hostname,
 1633             args->len, 0, 0));
 1634 }
 1635 
 1636 int
 1637 linux_setdomainname(struct thread *td, struct linux_setdomainname_args *args)
 1638 {
 1639         int name[2];
 1640 
 1641 #ifdef DEBUG
 1642         if (ldebug(setdomainname))
 1643                 printf(ARGS(setdomainname, "*, %i"), args->len);
 1644 #endif
 1645 
 1646         name[0] = CTL_KERN;
 1647         name[1] = KERN_NISDOMAINNAME;
 1648         return (userland_sysctl(td, name, 2, 0, 0, 0, args->name,
 1649             args->len, 0, 0));
 1650 }
 1651 
 1652 int
 1653 linux_exit_group(struct thread *td, struct linux_exit_group_args *args)
 1654 {
 1655         struct linux_emuldata *em;
 1656 
 1657 #ifdef DEBUG
 1658         if (ldebug(exit_group))
 1659                 printf(ARGS(exit_group, "%i"), args->error_code);
 1660 #endif
 1661 
 1662         em = em_find(td->td_proc, EMUL_DONTLOCK);
 1663         if (em->shared->refs > 1) {
 1664                 EMUL_SHARED_WLOCK(&emul_shared_lock);
 1665                 em->shared->flags |= EMUL_SHARED_HASXSTAT;
 1666                 em->shared->xstat = W_EXITCODE(args->error_code, 0);
 1667                 EMUL_SHARED_WUNLOCK(&emul_shared_lock);
 1668                 if (linux_use26(td))
 1669                         linux_kill_threads(td, SIGKILL);
 1670         }
 1671 
 1672         /*
 1673          * XXX: we should send a signal to the parent if
 1674          * SIGNAL_EXIT_GROUP is set. We ignore that (temporarily?)
 1675          * as it doesnt occur often.
 1676          */
 1677         exit1(td, W_EXITCODE(args->error_code, 0));
 1678 
 1679         return (0);
 1680 }
 1681 
 1682 #define _LINUX_CAPABILITY_VERSION  0x19980330
 1683 
 1684 struct l_user_cap_header {
 1685         l_int   version;
 1686         l_int   pid;
 1687 };
 1688 
 1689 struct l_user_cap_data {
 1690         l_int   effective;
 1691         l_int   permitted;
 1692         l_int   inheritable;
 1693 };
 1694 
 1695 int
 1696 linux_capget(struct thread *td, struct linux_capget_args *args)
 1697 {
 1698         struct l_user_cap_header luch;
 1699         struct l_user_cap_data lucd;
 1700         int error;
 1701 
 1702         if (args->hdrp == NULL)
 1703                 return (EFAULT);
 1704 
 1705         error = copyin(args->hdrp, &luch, sizeof(luch));
 1706         if (error != 0)
 1707                 return (error);
 1708 
 1709         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1710                 luch.version = _LINUX_CAPABILITY_VERSION;
 1711                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1712                 if (error)
 1713                         return (error);
 1714                 return (EINVAL);
 1715         }
 1716 
 1717         if (luch.pid)
 1718                 return (EPERM);
 1719 
 1720         if (args->datap) {
 1721                 /*
 1722                  * The current implementation doesn't support setting
 1723                  * a capability (it's essentially a stub) so indicate
 1724                  * that no capabilities are currently set or available
 1725                  * to request.
 1726                  */
 1727                 bzero (&lucd, sizeof(lucd));
 1728                 error = copyout(&lucd, args->datap, sizeof(lucd));
 1729         }
 1730 
 1731         return (error);
 1732 }
 1733 
 1734 int
 1735 linux_capset(struct thread *td, struct linux_capset_args *args)
 1736 {
 1737         struct l_user_cap_header luch;
 1738         struct l_user_cap_data lucd;
 1739         int error;
 1740 
 1741         if (args->hdrp == NULL || args->datap == NULL)
 1742                 return (EFAULT);
 1743 
 1744         error = copyin(args->hdrp, &luch, sizeof(luch));
 1745         if (error != 0)
 1746                 return (error);
 1747 
 1748         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1749                 luch.version = _LINUX_CAPABILITY_VERSION;
 1750                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1751                 if (error)
 1752                         return (error);
 1753                 return (EINVAL);
 1754         }
 1755 
 1756         if (luch.pid)
 1757                 return (EPERM);
 1758 
 1759         error = copyin(args->datap, &lucd, sizeof(lucd));
 1760         if (error != 0)
 1761                 return (error);
 1762 
 1763         /* We currently don't support setting any capabilities. */
 1764         if (lucd.effective || lucd.permitted || lucd.inheritable) {
 1765                 linux_msg(td,
 1766                           "capset effective=0x%x, permitted=0x%x, "
 1767                           "inheritable=0x%x is not implemented",
 1768                           (int)lucd.effective, (int)lucd.permitted,
 1769                           (int)lucd.inheritable);
 1770                 return (EPERM);
 1771         }
 1772 
 1773         return (0);
 1774 }
 1775 
 1776 int
 1777 linux_prctl(struct thread *td, struct linux_prctl_args *args)
 1778 {
 1779         int error = 0, max_size;
 1780         struct proc *p = td->td_proc;
 1781         char comm[LINUX_MAX_COMM_LEN];
 1782         struct linux_emuldata *em;
 1783         int pdeath_signal;
 1784 
 1785 #ifdef DEBUG
 1786         if (ldebug(prctl))
 1787                 printf(ARGS(prctl, "%d, %d, %d, %d, %d"), args->option,
 1788                     args->arg2, args->arg3, args->arg4, args->arg5);
 1789 #endif
 1790 
 1791         switch (args->option) {
 1792         case LINUX_PR_SET_PDEATHSIG:
 1793                 if (!LINUX_SIG_VALID(args->arg2))
 1794                         return (EINVAL);
 1795                 em = em_find(p, EMUL_DOLOCK);
 1796                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1797                 em->pdeath_signal = args->arg2;
 1798                 EMUL_UNLOCK(&emul_lock);
 1799                 break;
 1800         case LINUX_PR_GET_PDEATHSIG:
 1801                 em = em_find(p, EMUL_DOLOCK);
 1802                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1803                 pdeath_signal = em->pdeath_signal;
 1804                 EMUL_UNLOCK(&emul_lock);
 1805                 error = copyout(&pdeath_signal,
 1806                     (void *)(register_t)args->arg2,
 1807                     sizeof(pdeath_signal));
 1808                 break;
 1809         case LINUX_PR_GET_KEEPCAPS:
 1810                 /*
 1811                  * Indicate that we always clear the effective and
 1812                  * permitted capability sets when the user id becomes
 1813                  * non-zero (actually the capability sets are simply
 1814                  * always zero in the current implementation).
 1815                  */
 1816                 td->td_retval[0] = 0;
 1817                 break;
 1818         case LINUX_PR_SET_KEEPCAPS:
 1819                 /*
 1820                  * Ignore requests to keep the effective and permitted
 1821                  * capability sets when the user id becomes non-zero.
 1822                  */
 1823                 break;
 1824         case LINUX_PR_SET_NAME:
 1825                 /*
 1826                  * To be on the safe side we need to make sure to not
 1827                  * overflow the size a linux program expects. We already
 1828                  * do this here in the copyin, so that we don't need to
 1829                  * check on copyout.
 1830                  */
 1831                 max_size = MIN(sizeof(comm), sizeof(p->p_comm));
 1832                 error = copyinstr((void *)(register_t)args->arg2, comm,
 1833                     max_size, NULL);
 1834 
 1835                 /* Linux silently truncates the name if it is too long. */
 1836                 if (error == ENAMETOOLONG) {
 1837                         /*
 1838                          * XXX: copyinstr() isn't documented to populate the
 1839                          * array completely, so do a copyin() to be on the
 1840                          * safe side. This should be changed in case
 1841                          * copyinstr() is changed to guarantee this.
 1842                          */
 1843                         error = copyin((void *)(register_t)args->arg2, comm,
 1844                             max_size - 1);
 1845                         comm[max_size - 1] = '\0';
 1846                 }
 1847                 if (error)
 1848                         return (error);
 1849 
 1850                 PROC_LOCK(p);
 1851                 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
 1852                 PROC_UNLOCK(p);
 1853                 break;
 1854         case LINUX_PR_GET_NAME:
 1855                 PROC_LOCK(p);
 1856                 strlcpy(comm, p->p_comm, sizeof(comm));
 1857                 PROC_UNLOCK(p);
 1858                 error = copyout(comm, (void *)(register_t)args->arg2,
 1859                     strlen(comm) + 1);
 1860                 break;
 1861         default:
 1862                 error = EINVAL;
 1863                 break;
 1864         }
 1865 
 1866         return (error);
 1867 }
 1868 
 1869 /*
 1870  * Get affinity of a process.
 1871  */
 1872 int
 1873 linux_sched_getaffinity(struct thread *td,
 1874     struct linux_sched_getaffinity_args *args)
 1875 {
 1876         int error;
 1877         struct cpuset_getaffinity_args cga;
 1878 
 1879 #ifdef DEBUG
 1880         if (ldebug(sched_getaffinity))
 1881                 printf(ARGS(sched_getaffinity, "%d, %d, *"), args->pid,
 1882                     args->len);
 1883 #endif
 1884         if (args->len < sizeof(cpuset_t))
 1885                 return (EINVAL);
 1886 
 1887         cga.level = CPU_LEVEL_WHICH;
 1888         cga.which = CPU_WHICH_PID;
 1889         cga.id = args->pid;
 1890         cga.cpusetsize = sizeof(cpuset_t);
 1891         cga.mask = (cpuset_t *) args->user_mask_ptr;
 1892 
 1893         if ((error = cpuset_getaffinity(td, &cga)) == 0)
 1894                 td->td_retval[0] = sizeof(cpuset_t);
 1895 
 1896         return (error);
 1897 }
 1898 
 1899 /*
 1900  *  Set affinity of a process.
 1901  */
 1902 int
 1903 linux_sched_setaffinity(struct thread *td,
 1904     struct linux_sched_setaffinity_args *args)
 1905 {
 1906         struct cpuset_setaffinity_args csa;
 1907 
 1908 #ifdef DEBUG
 1909         if (ldebug(sched_setaffinity))
 1910                 printf(ARGS(sched_setaffinity, "%d, %d, *"), args->pid,
 1911                     args->len);
 1912 #endif
 1913         if (args->len < sizeof(cpuset_t))
 1914                 return (EINVAL);
 1915 
 1916         csa.level = CPU_LEVEL_WHICH;
 1917         csa.which = CPU_WHICH_PID;
 1918         csa.id = args->pid;
 1919         csa.cpusetsize = sizeof(cpuset_t);
 1920         csa.mask = (cpuset_t *) args->user_mask_ptr;
 1921 
 1922         return (cpuset_setaffinity(td, &csa));
 1923 }

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