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: releng/11.2/sys/compat/linux/linux_misc.c 319823 2017-06-11 09:33:09Z dchagin $");
   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/racct.h>
   54 #include <sys/random.h>
   55 #include <sys/resourcevar.h>
   56 #include <sys/sched.h>
   57 #include <sys/sdt.h>
   58 #include <sys/signalvar.h>
   59 #include <sys/stat.h>
   60 #include <sys/syscallsubr.h>
   61 #include <sys/sysctl.h>
   62 #include <sys/sysproto.h>
   63 #include <sys/systm.h>
   64 #include <sys/time.h>
   65 #include <sys/vmmeter.h>
   66 #include <sys/vnode.h>
   67 #include <sys/wait.h>
   68 #include <sys/cpuset.h>
   69 #include <sys/uio.h>
   70 
   71 #include <security/mac/mac_framework.h>
   72 
   73 #include <vm/vm.h>
   74 #include <vm/pmap.h>
   75 #include <vm/vm_kern.h>
   76 #include <vm/vm_map.h>
   77 #include <vm/vm_extern.h>
   78 #include <vm/vm_object.h>
   79 #include <vm/swap_pager.h>
   80 
   81 #ifdef COMPAT_LINUX32
   82 #include <machine/../linux32/linux.h>
   83 #include <machine/../linux32/linux32_proto.h>
   84 #else
   85 #include <machine/../linux/linux.h>
   86 #include <machine/../linux/linux_proto.h>
   87 #endif
   88 
   89 #include <compat/linux/linux_dtrace.h>
   90 #include <compat/linux/linux_file.h>
   91 #include <compat/linux/linux_mib.h>
   92 #include <compat/linux/linux_signal.h>
   93 #include <compat/linux/linux_timer.h>
   94 #include <compat/linux/linux_util.h>
   95 #include <compat/linux/linux_sysproto.h>
   96 #include <compat/linux/linux_emul.h>
   97 #include <compat/linux/linux_misc.h>
   98 
   99 /**
  100  * Special DTrace provider for the linuxulator.
  101  *
  102  * In this file we define the provider for the entire linuxulator. All
  103  * modules (= files of the linuxulator) use it.
  104  *
  105  * We define a different name depending on the emulated bitsize, see
  106  * ../../<ARCH>/linux{,32}/linux.h, e.g.:
  107  *      native bitsize          = linuxulator
  108  *      amd64, 32bit emulation  = linuxulator32
  109  */
  110 LIN_SDT_PROVIDER_DEFINE(LINUX_DTRACE);
  111 
  112 int stclohz;                            /* Statistics clock frequency */
  113 
  114 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
  115         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
  116         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE,
  117         RLIMIT_MEMLOCK, RLIMIT_AS 
  118 };
  119 
  120 struct l_sysinfo {
  121         l_long          uptime;         /* Seconds since boot */
  122         l_ulong         loads[3];       /* 1, 5, and 15 minute load averages */
  123 #define LINUX_SYSINFO_LOADS_SCALE 65536
  124         l_ulong         totalram;       /* Total usable main memory size */
  125         l_ulong         freeram;        /* Available memory size */
  126         l_ulong         sharedram;      /* Amount of shared memory */
  127         l_ulong         bufferram;      /* Memory used by buffers */
  128         l_ulong         totalswap;      /* Total swap space size */
  129         l_ulong         freeswap;       /* swap space still available */
  130         l_ushort        procs;          /* Number of current processes */
  131         l_ushort        pads;
  132         l_ulong         totalbig;
  133         l_ulong         freebig;
  134         l_uint          mem_unit;
  135         char            _f[20-2*sizeof(l_long)-sizeof(l_int)];  /* padding */
  136 };
  137 
  138 struct l_pselect6arg {
  139         l_uintptr_t     ss;
  140         l_size_t        ss_len;
  141 };
  142 
  143 static int      linux_utimensat_nsec_valid(l_long);
  144 
  145 
  146 int
  147 linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
  148 {
  149         struct l_sysinfo sysinfo;
  150         vm_object_t object;
  151         int i, j;
  152         struct timespec ts;
  153 
  154         bzero(&sysinfo, sizeof(sysinfo));
  155         getnanouptime(&ts);
  156         if (ts.tv_nsec != 0)
  157                 ts.tv_sec++;
  158         sysinfo.uptime = ts.tv_sec;
  159 
  160         /* Use the information from the mib to get our load averages */
  161         for (i = 0; i < 3; i++)
  162                 sysinfo.loads[i] = averunnable.ldavg[i] *
  163                     LINUX_SYSINFO_LOADS_SCALE / averunnable.fscale;
  164 
  165         sysinfo.totalram = physmem * PAGE_SIZE;
  166         sysinfo.freeram = sysinfo.totalram - vm_cnt.v_wire_count * PAGE_SIZE;
  167 
  168         sysinfo.sharedram = 0;
  169         mtx_lock(&vm_object_list_mtx);
  170         TAILQ_FOREACH(object, &vm_object_list, object_list)
  171                 if (object->shadow_count > 1)
  172                         sysinfo.sharedram += object->resident_page_count;
  173         mtx_unlock(&vm_object_list_mtx);
  174 
  175         sysinfo.sharedram *= PAGE_SIZE;
  176         sysinfo.bufferram = 0;
  177 
  178         swap_pager_status(&i, &j);
  179         sysinfo.totalswap = i * PAGE_SIZE;
  180         sysinfo.freeswap = (i - j) * PAGE_SIZE;
  181 
  182         sysinfo.procs = nprocs;
  183 
  184         /* The following are only present in newer Linux kernels. */
  185         sysinfo.totalbig = 0;
  186         sysinfo.freebig = 0;
  187         sysinfo.mem_unit = 1;
  188 
  189         return (copyout(&sysinfo, args->info, sizeof(sysinfo)));
  190 }
  191 
  192 int
  193 linux_alarm(struct thread *td, struct linux_alarm_args *args)
  194 {
  195         struct itimerval it, old_it;
  196         u_int secs;
  197         int error;
  198 
  199 #ifdef DEBUG
  200         if (ldebug(alarm))
  201                 printf(ARGS(alarm, "%u"), args->secs);
  202 #endif
  203         secs = args->secs;
  204         /*
  205          * Linux alarm() is always successful. Limit secs to INT32_MAX / 2
  206          * to match kern_setitimer()'s limit to avoid error from it.
  207          *
  208          * XXX. Linux limit secs to INT_MAX on 32 and does not limit on 64-bit
  209          * platforms.
  210          */
  211         if (secs > INT32_MAX / 2)
  212                 secs = INT32_MAX / 2;
  213 
  214         it.it_value.tv_sec = secs;
  215         it.it_value.tv_usec = 0;
  216         timevalclear(&it.it_interval);
  217         error = kern_setitimer(td, ITIMER_REAL, &it, &old_it);
  218         KASSERT(error == 0, ("kern_setitimer returns %d", error));
  219 
  220         if ((old_it.it_value.tv_sec == 0 && old_it.it_value.tv_usec > 0) ||
  221             old_it.it_value.tv_usec >= 500000)
  222                 old_it.it_value.tv_sec++;
  223         td->td_retval[0] = old_it.it_value.tv_sec;
  224         return (0);
  225 }
  226 
  227 int
  228 linux_brk(struct thread *td, struct linux_brk_args *args)
  229 {
  230         struct vmspace *vm = td->td_proc->p_vmspace;
  231         vm_offset_t new, old;
  232         struct obreak_args /* {
  233                 char * nsize;
  234         } */ tmp;
  235 
  236 #ifdef DEBUG
  237         if (ldebug(brk))
  238                 printf(ARGS(brk, "%p"), (void *)(uintptr_t)args->dsend);
  239 #endif
  240         old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
  241         new = (vm_offset_t)args->dsend;
  242         tmp.nsize = (char *)new;
  243         if (((caddr_t)new > vm->vm_daddr) && !sys_obreak(td, &tmp))
  244                 td->td_retval[0] = (long)new;
  245         else
  246                 td->td_retval[0] = (long)old;
  247 
  248         return (0);
  249 }
  250 
  251 #if defined(__i386__)
  252 /* XXX: what about amd64/linux32? */
  253 
  254 int
  255 linux_uselib(struct thread *td, struct linux_uselib_args *args)
  256 {
  257         struct nameidata ni;
  258         struct vnode *vp;
  259         struct exec *a_out;
  260         struct vattr attr;
  261         vm_offset_t vmaddr;
  262         unsigned long file_offset;
  263         unsigned long bss_size;
  264         char *library;
  265         ssize_t aresid;
  266         int error, locked, writecount;
  267 
  268         LCONVPATHEXIST(td, args->library, &library);
  269 
  270 #ifdef DEBUG
  271         if (ldebug(uselib))
  272                 printf(ARGS(uselib, "%s"), library);
  273 #endif
  274 
  275         a_out = NULL;
  276         locked = 0;
  277         vp = NULL;
  278 
  279         NDINIT(&ni, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1,
  280             UIO_SYSSPACE, library, td);
  281         error = namei(&ni);
  282         LFREEPATH(library);
  283         if (error)
  284                 goto cleanup;
  285 
  286         vp = ni.ni_vp;
  287         NDFREE(&ni, NDF_ONLY_PNBUF);
  288 
  289         /*
  290          * From here on down, we have a locked vnode that must be unlocked.
  291          * XXX: The code below largely duplicates exec_check_permissions().
  292          */
  293         locked = 1;
  294 
  295         /* Writable? */
  296         error = VOP_GET_WRITECOUNT(vp, &writecount);
  297         if (error != 0)
  298                 goto cleanup;
  299         if (writecount != 0) {
  300                 error = ETXTBSY;
  301                 goto cleanup;
  302         }
  303 
  304         /* Executable? */
  305         error = VOP_GETATTR(vp, &attr, td->td_ucred);
  306         if (error)
  307                 goto cleanup;
  308 
  309         if ((vp->v_mount->mnt_flag & MNT_NOEXEC) ||
  310             ((attr.va_mode & 0111) == 0) || (attr.va_type != VREG)) {
  311                 /* EACCESS is what exec(2) returns. */
  312                 error = ENOEXEC;
  313                 goto cleanup;
  314         }
  315 
  316         /* Sensible size? */
  317         if (attr.va_size == 0) {
  318                 error = ENOEXEC;
  319                 goto cleanup;
  320         }
  321 
  322         /* Can we access it? */
  323         error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
  324         if (error)
  325                 goto cleanup;
  326 
  327         /*
  328          * XXX: This should use vn_open() so that it is properly authorized,
  329          * and to reduce code redundancy all over the place here.
  330          * XXX: Not really, it duplicates far more of exec_check_permissions()
  331          * than vn_open().
  332          */
  333 #ifdef MAC
  334         error = mac_vnode_check_open(td->td_ucred, vp, VREAD);
  335         if (error)
  336                 goto cleanup;
  337 #endif
  338         error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL);
  339         if (error)
  340                 goto cleanup;
  341 
  342         /* Pull in executable header into exec_map */
  343         error = vm_mmap(exec_map, (vm_offset_t *)&a_out, PAGE_SIZE,
  344             VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE, vp, 0);
  345         if (error)
  346                 goto cleanup;
  347 
  348         /* Is it a Linux binary ? */
  349         if (((a_out->a_magic >> 16) & 0xff) != 0x64) {
  350                 error = ENOEXEC;
  351                 goto cleanup;
  352         }
  353 
  354         /*
  355          * While we are here, we should REALLY do some more checks
  356          */
  357 
  358         /* Set file/virtual offset based on a.out variant. */
  359         switch ((int)(a_out->a_magic & 0xffff)) {
  360         case 0413:                      /* ZMAGIC */
  361                 file_offset = 1024;
  362                 break;
  363         case 0314:                      /* QMAGIC */
  364                 file_offset = 0;
  365                 break;
  366         default:
  367                 error = ENOEXEC;
  368                 goto cleanup;
  369         }
  370 
  371         bss_size = round_page(a_out->a_bss);
  372 
  373         /* Check various fields in header for validity/bounds. */
  374         if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) {
  375                 error = ENOEXEC;
  376                 goto cleanup;
  377         }
  378 
  379         /* text + data can't exceed file size */
  380         if (a_out->a_data + a_out->a_text > attr.va_size) {
  381                 error = EFAULT;
  382                 goto cleanup;
  383         }
  384 
  385         /*
  386          * text/data/bss must not exceed limits
  387          * XXX - this is not complete. it should check current usage PLUS
  388          * the resources needed by this library.
  389          */
  390         PROC_LOCK(td->td_proc);
  391         if (a_out->a_text > maxtsiz ||
  392             a_out->a_data + bss_size > lim_cur_proc(td->td_proc, RLIMIT_DATA) ||
  393             racct_set(td->td_proc, RACCT_DATA, a_out->a_data +
  394             bss_size) != 0) {
  395                 PROC_UNLOCK(td->td_proc);
  396                 error = ENOMEM;
  397                 goto cleanup;
  398         }
  399         PROC_UNLOCK(td->td_proc);
  400 
  401         /*
  402          * Prevent more writers.
  403          * XXX: Note that if any of the VM operations fail below we don't
  404          * clear this flag.
  405          */
  406         VOP_SET_TEXT(vp);
  407 
  408         /*
  409          * Lock no longer needed
  410          */
  411         locked = 0;
  412         VOP_UNLOCK(vp, 0);
  413 
  414         /*
  415          * Check if file_offset page aligned. Currently we cannot handle
  416          * misalinged file offsets, and so we read in the entire image
  417          * (what a waste).
  418          */
  419         if (file_offset & PAGE_MASK) {
  420 #ifdef DEBUG
  421                 printf("uselib: Non page aligned binary %lu\n", file_offset);
  422 #endif
  423                 /* Map text+data read/write/execute */
  424 
  425                 /* a_entry is the load address and is page aligned */
  426                 vmaddr = trunc_page(a_out->a_entry);
  427 
  428                 /* get anon user mapping, read+write+execute */
  429                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  430                     &vmaddr, a_out->a_text + a_out->a_data, 0, VMFS_NO_SPACE,
  431                     VM_PROT_ALL, VM_PROT_ALL, 0);
  432                 if (error)
  433                         goto cleanup;
  434 
  435                 error = vn_rdwr(UIO_READ, vp, (void *)vmaddr, file_offset,
  436                     a_out->a_text + a_out->a_data, UIO_USERSPACE, 0,
  437                     td->td_ucred, NOCRED, &aresid, td);
  438                 if (error != 0)
  439                         goto cleanup;
  440                 if (aresid != 0) {
  441                         error = ENOEXEC;
  442                         goto cleanup;
  443                 }
  444         } else {
  445 #ifdef DEBUG
  446                 printf("uselib: Page aligned binary %lu\n", file_offset);
  447 #endif
  448                 /*
  449                  * for QMAGIC, a_entry is 20 bytes beyond the load address
  450                  * to skip the executable header
  451                  */
  452                 vmaddr = trunc_page(a_out->a_entry);
  453 
  454                 /*
  455                  * Map it all into the process's space as a single
  456                  * copy-on-write "data" segment.
  457                  */
  458                 error = vm_mmap(&td->td_proc->p_vmspace->vm_map, &vmaddr,
  459                     a_out->a_text + a_out->a_data, VM_PROT_ALL, VM_PROT_ALL,
  460                     MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, file_offset);
  461                 if (error)
  462                         goto cleanup;
  463         }
  464 #ifdef DEBUG
  465         printf("mem=%08lx = %08lx %08lx\n", (long)vmaddr, ((long *)vmaddr)[0],
  466             ((long *)vmaddr)[1]);
  467 #endif
  468         if (bss_size != 0) {
  469                 /* Calculate BSS start address */
  470                 vmaddr = trunc_page(a_out->a_entry) + a_out->a_text +
  471                     a_out->a_data;
  472 
  473                 /* allocate some 'anon' space */
  474                 error = vm_map_find(&td->td_proc->p_vmspace->vm_map, NULL, 0,
  475                     &vmaddr, bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL,
  476                     VM_PROT_ALL, 0);
  477                 if (error)
  478                         goto cleanup;
  479         }
  480 
  481 cleanup:
  482         /* Unlock vnode if needed */
  483         if (locked)
  484                 VOP_UNLOCK(vp, 0);
  485 
  486         /* Release the temporary mapping. */
  487         if (a_out)
  488                 kmap_free_wakeup(exec_map, (vm_offset_t)a_out, PAGE_SIZE);
  489 
  490         return (error);
  491 }
  492 
  493 #endif  /* __i386__ */
  494 
  495 int
  496 linux_select(struct thread *td, struct linux_select_args *args)
  497 {
  498         l_timeval ltv;
  499         struct timeval tv0, tv1, utv, *tvp;
  500         int error;
  501 
  502 #ifdef DEBUG
  503         if (ldebug(select))
  504                 printf(ARGS(select, "%d, %p, %p, %p, %p"), args->nfds,
  505                     (void *)args->readfds, (void *)args->writefds,
  506                     (void *)args->exceptfds, (void *)args->timeout);
  507 #endif
  508 
  509         /*
  510          * Store current time for computation of the amount of
  511          * time left.
  512          */
  513         if (args->timeout) {
  514                 if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
  515                         goto select_out;
  516                 utv.tv_sec = ltv.tv_sec;
  517                 utv.tv_usec = ltv.tv_usec;
  518 #ifdef DEBUG
  519                 if (ldebug(select))
  520                         printf(LMSG("incoming timeout (%jd/%ld)"),
  521                             (intmax_t)utv.tv_sec, utv.tv_usec);
  522 #endif
  523 
  524                 if (itimerfix(&utv)) {
  525                         /*
  526                          * The timeval was invalid.  Convert it to something
  527                          * valid that will act as it does under Linux.
  528                          */
  529                         utv.tv_sec += utv.tv_usec / 1000000;
  530                         utv.tv_usec %= 1000000;
  531                         if (utv.tv_usec < 0) {
  532                                 utv.tv_sec -= 1;
  533                                 utv.tv_usec += 1000000;
  534                         }
  535                         if (utv.tv_sec < 0)
  536                                 timevalclear(&utv);
  537                 }
  538                 microtime(&tv0);
  539                 tvp = &utv;
  540         } else
  541                 tvp = NULL;
  542 
  543         error = kern_select(td, args->nfds, args->readfds, args->writefds,
  544             args->exceptfds, tvp, LINUX_NFDBITS);
  545 
  546 #ifdef DEBUG
  547         if (ldebug(select))
  548                 printf(LMSG("real select returns %d"), error);
  549 #endif
  550         if (error)
  551                 goto select_out;
  552 
  553         if (args->timeout) {
  554                 if (td->td_retval[0]) {
  555                         /*
  556                          * Compute how much time was left of the timeout,
  557                          * by subtracting the current time and the time
  558                          * before we started the call, and subtracting
  559                          * that result from the user-supplied value.
  560                          */
  561                         microtime(&tv1);
  562                         timevalsub(&tv1, &tv0);
  563                         timevalsub(&utv, &tv1);
  564                         if (utv.tv_sec < 0)
  565                                 timevalclear(&utv);
  566                 } else
  567                         timevalclear(&utv);
  568 #ifdef DEBUG
  569                 if (ldebug(select))
  570                         printf(LMSG("outgoing timeout (%jd/%ld)"),
  571                             (intmax_t)utv.tv_sec, utv.tv_usec);
  572 #endif
  573                 ltv.tv_sec = utv.tv_sec;
  574                 ltv.tv_usec = utv.tv_usec;
  575                 if ((error = copyout(&ltv, args->timeout, sizeof(ltv))))
  576                         goto select_out;
  577         }
  578 
  579 select_out:
  580 #ifdef DEBUG
  581         if (ldebug(select))
  582                 printf(LMSG("select_out -> %d"), error);
  583 #endif
  584         return (error);
  585 }
  586 
  587 int
  588 linux_mremap(struct thread *td, struct linux_mremap_args *args)
  589 {
  590         uintptr_t addr;
  591         size_t len;
  592         int error = 0;
  593 
  594 #ifdef DEBUG
  595         if (ldebug(mremap))
  596                 printf(ARGS(mremap, "%p, %08lx, %08lx, %08lx"),
  597                     (void *)(uintptr_t)args->addr,
  598                     (unsigned long)args->old_len,
  599                     (unsigned long)args->new_len,
  600                     (unsigned long)args->flags);
  601 #endif
  602 
  603         if (args->flags & ~(LINUX_MREMAP_FIXED | LINUX_MREMAP_MAYMOVE)) {
  604                 td->td_retval[0] = 0;
  605                 return (EINVAL);
  606         }
  607 
  608         /*
  609          * Check for the page alignment.
  610          * Linux defines PAGE_MASK to be FreeBSD ~PAGE_MASK.
  611          */
  612         if (args->addr & PAGE_MASK) {
  613                 td->td_retval[0] = 0;
  614                 return (EINVAL);
  615         }
  616 
  617         args->new_len = round_page(args->new_len);
  618         args->old_len = round_page(args->old_len);
  619 
  620         if (args->new_len > args->old_len) {
  621                 td->td_retval[0] = 0;
  622                 return (ENOMEM);
  623         }
  624 
  625         if (args->new_len < args->old_len) {
  626                 addr = args->addr + args->new_len;
  627                 len = args->old_len - args->new_len;
  628                 error = kern_munmap(td, addr, len);
  629         }
  630 
  631         td->td_retval[0] = error ? 0 : (uintptr_t)args->addr;
  632         return (error);
  633 }
  634 
  635 #define LINUX_MS_ASYNC       0x0001
  636 #define LINUX_MS_INVALIDATE  0x0002
  637 #define LINUX_MS_SYNC        0x0004
  638 
  639 int
  640 linux_msync(struct thread *td, struct linux_msync_args *args)
  641 {
  642 
  643         return (kern_msync(td, args->addr, args->len,
  644             args->fl & ~LINUX_MS_SYNC));
  645 }
  646 
  647 int
  648 linux_time(struct thread *td, struct linux_time_args *args)
  649 {
  650         struct timeval tv;
  651         l_time_t tm;
  652         int error;
  653 
  654 #ifdef DEBUG
  655         if (ldebug(time))
  656                 printf(ARGS(time, "*"));
  657 #endif
  658 
  659         microtime(&tv);
  660         tm = tv.tv_sec;
  661         if (args->tm && (error = copyout(&tm, args->tm, sizeof(tm))))
  662                 return (error);
  663         td->td_retval[0] = tm;
  664         return (0);
  665 }
  666 
  667 struct l_times_argv {
  668         l_clock_t       tms_utime;
  669         l_clock_t       tms_stime;
  670         l_clock_t       tms_cutime;
  671         l_clock_t       tms_cstime;
  672 };
  673 
  674 
  675 /*
  676  * Glibc versions prior to 2.2.1 always use hard-coded CLK_TCK value.
  677  * Since 2.2.1 Glibc uses value exported from kernel via AT_CLKTCK
  678  * auxiliary vector entry.
  679  */
  680 #define CLK_TCK         100
  681 
  682 #define CONVOTCK(r)     (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  683 #define CONVNTCK(r)     (r.tv_sec * stclohz + r.tv_usec / (1000000 / stclohz))
  684 
  685 #define CONVTCK(r)      (linux_kernver(td) >= LINUX_KERNVER_2004000 ?           \
  686                             CONVNTCK(r) : CONVOTCK(r))
  687 
  688 int
  689 linux_times(struct thread *td, struct linux_times_args *args)
  690 {
  691         struct timeval tv, utime, stime, cutime, cstime;
  692         struct l_times_argv tms;
  693         struct proc *p;
  694         int error;
  695 
  696 #ifdef DEBUG
  697         if (ldebug(times))
  698                 printf(ARGS(times, "*"));
  699 #endif
  700 
  701         if (args->buf != NULL) {
  702                 p = td->td_proc;
  703                 PROC_LOCK(p);
  704                 PROC_STATLOCK(p);
  705                 calcru(p, &utime, &stime);
  706                 PROC_STATUNLOCK(p);
  707                 calccru(p, &cutime, &cstime);
  708                 PROC_UNLOCK(p);
  709 
  710                 tms.tms_utime = CONVTCK(utime);
  711                 tms.tms_stime = CONVTCK(stime);
  712 
  713                 tms.tms_cutime = CONVTCK(cutime);
  714                 tms.tms_cstime = CONVTCK(cstime);
  715 
  716                 if ((error = copyout(&tms, args->buf, sizeof(tms))))
  717                         return (error);
  718         }
  719 
  720         microuptime(&tv);
  721         td->td_retval[0] = (int)CONVTCK(tv);
  722         return (0);
  723 }
  724 
  725 int
  726 linux_newuname(struct thread *td, struct linux_newuname_args *args)
  727 {
  728         struct l_new_utsname utsname;
  729         char osname[LINUX_MAX_UTSNAME];
  730         char osrelease[LINUX_MAX_UTSNAME];
  731         char *p;
  732 
  733 #ifdef DEBUG
  734         if (ldebug(newuname))
  735                 printf(ARGS(newuname, "*"));
  736 #endif
  737 
  738         linux_get_osname(td, osname);
  739         linux_get_osrelease(td, osrelease);
  740 
  741         bzero(&utsname, sizeof(utsname));
  742         strlcpy(utsname.sysname, osname, LINUX_MAX_UTSNAME);
  743         getcredhostname(td->td_ucred, utsname.nodename, LINUX_MAX_UTSNAME);
  744         getcreddomainname(td->td_ucred, utsname.domainname, LINUX_MAX_UTSNAME);
  745         strlcpy(utsname.release, osrelease, LINUX_MAX_UTSNAME);
  746         strlcpy(utsname.version, version, LINUX_MAX_UTSNAME);
  747         for (p = utsname.version; *p != '\0'; ++p)
  748                 if (*p == '\n') {
  749                         *p = '\0';
  750                         break;
  751                 }
  752         strlcpy(utsname.machine, linux_kplatform, LINUX_MAX_UTSNAME);
  753 
  754         return (copyout(&utsname, args->buf, sizeof(utsname)));
  755 }
  756 
  757 struct l_utimbuf {
  758         l_time_t l_actime;
  759         l_time_t l_modtime;
  760 };
  761 
  762 int
  763 linux_utime(struct thread *td, struct linux_utime_args *args)
  764 {
  765         struct timeval tv[2], *tvp;
  766         struct l_utimbuf lut;
  767         char *fname;
  768         int error;
  769 
  770         LCONVPATHEXIST(td, args->fname, &fname);
  771 
  772 #ifdef DEBUG
  773         if (ldebug(utime))
  774                 printf(ARGS(utime, "%s, *"), fname);
  775 #endif
  776 
  777         if (args->times) {
  778                 if ((error = copyin(args->times, &lut, sizeof lut))) {
  779                         LFREEPATH(fname);
  780                         return (error);
  781                 }
  782                 tv[0].tv_sec = lut.l_actime;
  783                 tv[0].tv_usec = 0;
  784                 tv[1].tv_sec = lut.l_modtime;
  785                 tv[1].tv_usec = 0;
  786                 tvp = tv;
  787         } else
  788                 tvp = NULL;
  789 
  790         error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE, tvp,
  791             UIO_SYSSPACE);
  792         LFREEPATH(fname);
  793         return (error);
  794 }
  795 
  796 int
  797 linux_utimes(struct thread *td, struct linux_utimes_args *args)
  798 {
  799         l_timeval ltv[2];
  800         struct timeval tv[2], *tvp = NULL;
  801         char *fname;
  802         int error;
  803 
  804         LCONVPATHEXIST(td, args->fname, &fname);
  805 
  806 #ifdef DEBUG
  807         if (ldebug(utimes))
  808                 printf(ARGS(utimes, "%s, *"), fname);
  809 #endif
  810 
  811         if (args->tptr != NULL) {
  812                 if ((error = copyin(args->tptr, ltv, sizeof ltv))) {
  813                         LFREEPATH(fname);
  814                         return (error);
  815                 }
  816                 tv[0].tv_sec = ltv[0].tv_sec;
  817                 tv[0].tv_usec = ltv[0].tv_usec;
  818                 tv[1].tv_sec = ltv[1].tv_sec;
  819                 tv[1].tv_usec = ltv[1].tv_usec;
  820                 tvp = tv;
  821         }
  822 
  823         error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE,
  824             tvp, UIO_SYSSPACE);
  825         LFREEPATH(fname);
  826         return (error);
  827 }
  828 
  829 static int
  830 linux_utimensat_nsec_valid(l_long nsec)
  831 {
  832 
  833         if (nsec == LINUX_UTIME_OMIT || nsec == LINUX_UTIME_NOW)
  834                 return (0);
  835         if (nsec >= 0 && nsec <= 999999999)
  836                 return (0);
  837         return (1);
  838 }
  839 
  840 int 
  841 linux_utimensat(struct thread *td, struct linux_utimensat_args *args)
  842 {
  843         struct l_timespec l_times[2];
  844         struct timespec times[2], *timesp = NULL;
  845         char *path = NULL;
  846         int error, dfd, flags = 0;
  847 
  848         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  849 
  850 #ifdef DEBUG
  851         if (ldebug(utimensat))
  852                 printf(ARGS(utimensat, "%d, *"), dfd);
  853 #endif
  854 
  855         if (args->flags & ~LINUX_AT_SYMLINK_NOFOLLOW)
  856                 return (EINVAL);
  857 
  858         if (args->times != NULL) {
  859                 error = copyin(args->times, l_times, sizeof(l_times));
  860                 if (error != 0)
  861                         return (error);
  862 
  863                 if (linux_utimensat_nsec_valid(l_times[0].tv_nsec) != 0 ||
  864                     linux_utimensat_nsec_valid(l_times[1].tv_nsec) != 0)
  865                         return (EINVAL);
  866 
  867                 times[0].tv_sec = l_times[0].tv_sec;
  868                 switch (l_times[0].tv_nsec)
  869                 {
  870                 case LINUX_UTIME_OMIT:
  871                         times[0].tv_nsec = UTIME_OMIT;
  872                         break;
  873                 case LINUX_UTIME_NOW:
  874                         times[0].tv_nsec = UTIME_NOW;
  875                         break;
  876                 default:
  877                         times[0].tv_nsec = l_times[0].tv_nsec;
  878                 }
  879 
  880                 times[1].tv_sec = l_times[1].tv_sec;
  881                 switch (l_times[1].tv_nsec)
  882                 {
  883                 case LINUX_UTIME_OMIT:
  884                         times[1].tv_nsec = UTIME_OMIT;
  885                         break;
  886                 case LINUX_UTIME_NOW:
  887                         times[1].tv_nsec = UTIME_NOW;
  888                         break;
  889                 default:
  890                         times[1].tv_nsec = l_times[1].tv_nsec;
  891                         break;
  892                 }
  893                 timesp = times;
  894 
  895                 /* This breaks POSIX, but is what the Linux kernel does
  896                  * _on purpose_ (documented in the man page for utimensat(2)),
  897                  * so we must follow that behaviour. */
  898                 if (times[0].tv_nsec == UTIME_OMIT &&
  899                     times[1].tv_nsec == UTIME_OMIT)
  900                         return (0);
  901         }
  902 
  903         if (args->pathname != NULL)
  904                 LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
  905         else if (args->flags != 0)
  906                 return (EINVAL);
  907 
  908         if (args->flags & LINUX_AT_SYMLINK_NOFOLLOW)
  909                 flags |= AT_SYMLINK_NOFOLLOW;
  910 
  911         if (path == NULL)
  912                 error = kern_futimens(td, dfd, timesp, UIO_SYSSPACE);
  913         else {
  914                 error = kern_utimensat(td, dfd, path, UIO_SYSSPACE, timesp,
  915                         UIO_SYSSPACE, flags);
  916                 LFREEPATH(path);
  917         }
  918 
  919         return (error);
  920 }
  921 
  922 int
  923 linux_futimesat(struct thread *td, struct linux_futimesat_args *args)
  924 {
  925         l_timeval ltv[2];
  926         struct timeval tv[2], *tvp = NULL;
  927         char *fname;
  928         int error, dfd;
  929 
  930         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  931         LCONVPATHEXIST_AT(td, args->filename, &fname, dfd);
  932 
  933 #ifdef DEBUG
  934         if (ldebug(futimesat))
  935                 printf(ARGS(futimesat, "%s, *"), fname);
  936 #endif
  937 
  938         if (args->utimes != NULL) {
  939                 if ((error = copyin(args->utimes, ltv, sizeof ltv))) {
  940                         LFREEPATH(fname);
  941                         return (error);
  942                 }
  943                 tv[0].tv_sec = ltv[0].tv_sec;
  944                 tv[0].tv_usec = ltv[0].tv_usec;
  945                 tv[1].tv_sec = ltv[1].tv_sec;
  946                 tv[1].tv_usec = ltv[1].tv_usec;
  947                 tvp = tv;
  948         }
  949 
  950         error = kern_utimesat(td, dfd, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
  951         LFREEPATH(fname);
  952         return (error);
  953 }
  954 
  955 int
  956 linux_common_wait(struct thread *td, int pid, int *status,
  957     int options, struct rusage *ru)
  958 {
  959         int error, tmpstat;
  960 
  961         error = kern_wait(td, pid, &tmpstat, options, ru);
  962         if (error)
  963                 return (error);
  964 
  965         if (status) {
  966                 tmpstat &= 0xffff;
  967                 if (WIFSIGNALED(tmpstat))
  968                         tmpstat = (tmpstat & 0xffffff80) |
  969                             bsd_to_linux_signal(WTERMSIG(tmpstat));
  970                 else if (WIFSTOPPED(tmpstat))
  971                         tmpstat = (tmpstat & 0xffff00ff) |
  972                             (bsd_to_linux_signal(WSTOPSIG(tmpstat)) << 8);
  973                 else if (WIFCONTINUED(tmpstat))
  974                         tmpstat = 0xffff;
  975                 error = copyout(&tmpstat, status, sizeof(int));
  976         }
  977 
  978         return (error);
  979 }
  980 
  981 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  982 int
  983 linux_waitpid(struct thread *td, struct linux_waitpid_args *args)
  984 {
  985         struct linux_wait4_args wait4_args;
  986 
  987 #ifdef DEBUG
  988         if (ldebug(waitpid))
  989                 printf(ARGS(waitpid, "%d, %p, %d"),
  990                     args->pid, (void *)args->status, args->options);
  991 #endif
  992 
  993         wait4_args.pid = args->pid;
  994         wait4_args.status = args->status;
  995         wait4_args.options = args->options;
  996         wait4_args.rusage = NULL;
  997 
  998         return (linux_wait4(td, &wait4_args));
  999 }
 1000 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1001 
 1002 int
 1003 linux_wait4(struct thread *td, struct linux_wait4_args *args)
 1004 {
 1005         int error, options;
 1006         struct rusage ru, *rup;
 1007 
 1008 #ifdef DEBUG
 1009         if (ldebug(wait4))
 1010                 printf(ARGS(wait4, "%d, %p, %d, %p"),
 1011                     args->pid, (void *)args->status, args->options,
 1012                     (void *)args->rusage);
 1013 #endif
 1014         if (args->options & ~(LINUX_WUNTRACED | LINUX_WNOHANG |
 1015             LINUX_WCONTINUED | __WCLONE | __WNOTHREAD | __WALL))
 1016                 return (EINVAL);
 1017 
 1018         options = WEXITED;
 1019         linux_to_bsd_waitopts(args->options, &options);
 1020 
 1021         if (args->rusage != NULL)
 1022                 rup = &ru;
 1023         else
 1024                 rup = NULL;
 1025         error = linux_common_wait(td, args->pid, args->status, options, rup);
 1026         if (error != 0)
 1027                 return (error);
 1028         if (args->rusage != NULL)
 1029                 error = linux_copyout_rusage(&ru, args->rusage);
 1030         return (error);
 1031 }
 1032 
 1033 int
 1034 linux_waitid(struct thread *td, struct linux_waitid_args *args)
 1035 {
 1036         int status, options, sig;
 1037         struct __wrusage wru;
 1038         siginfo_t siginfo;
 1039         l_siginfo_t lsi;
 1040         idtype_t idtype;
 1041         struct proc *p;
 1042         int error;
 1043 
 1044         options = 0;
 1045         linux_to_bsd_waitopts(args->options, &options);
 1046 
 1047         if (options & ~(WNOHANG | WNOWAIT | WEXITED | WUNTRACED | WCONTINUED))
 1048                 return (EINVAL);
 1049         if (!(options & (WEXITED | WUNTRACED | WCONTINUED)))
 1050                 return (EINVAL);
 1051 
 1052         switch (args->idtype) {
 1053         case LINUX_P_ALL:
 1054                 idtype = P_ALL;
 1055                 break;
 1056         case LINUX_P_PID:
 1057                 if (args->id <= 0)
 1058                         return (EINVAL);
 1059                 idtype = P_PID;
 1060                 break;
 1061         case LINUX_P_PGID:
 1062                 if (args->id <= 0)
 1063                         return (EINVAL);
 1064                 idtype = P_PGID;
 1065                 break;
 1066         default:
 1067                 return (EINVAL);
 1068         }
 1069 
 1070         error = kern_wait6(td, idtype, args->id, &status, options,
 1071             &wru, &siginfo);
 1072         if (error != 0)
 1073                 return (error);
 1074         if (args->rusage != NULL) {
 1075                 error = linux_copyout_rusage(&wru.wru_children,
 1076                     args->rusage);
 1077                 if (error != 0)
 1078                         return (error);
 1079         }
 1080         if (args->info != NULL) {
 1081                 p = td->td_proc;
 1082                 if (td->td_retval[0] == 0)
 1083                         bzero(&lsi, sizeof(lsi));
 1084                 else {
 1085                         sig = bsd_to_linux_signal(siginfo.si_signo);
 1086                         siginfo_to_lsiginfo(&siginfo, &lsi, sig);
 1087                 }
 1088                 error = copyout(&lsi, args->info, sizeof(lsi));
 1089         }
 1090         td->td_retval[0] = 0;
 1091 
 1092         return (error);
 1093 }
 1094 
 1095 int
 1096 linux_mknod(struct thread *td, struct linux_mknod_args *args)
 1097 {
 1098         char *path;
 1099         int error;
 1100 
 1101         LCONVPATHCREAT(td, args->path, &path);
 1102 
 1103 #ifdef DEBUG
 1104         if (ldebug(mknod))
 1105                 printf(ARGS(mknod, "%s, %d, %ju"), path, args->mode,
 1106                     (uintmax_t)args->dev);
 1107 #endif
 1108 
 1109         switch (args->mode & S_IFMT) {
 1110         case S_IFIFO:
 1111         case S_IFSOCK:
 1112                 error = kern_mkfifoat(td, AT_FDCWD, path, UIO_SYSSPACE,
 1113                     args->mode);
 1114                 break;
 1115 
 1116         case S_IFCHR:
 1117         case S_IFBLK:
 1118                 error = kern_mknodat(td, AT_FDCWD, path, UIO_SYSSPACE,
 1119                     args->mode, args->dev);
 1120                 break;
 1121 
 1122         case S_IFDIR:
 1123                 error = EPERM;
 1124                 break;
 1125 
 1126         case 0:
 1127                 args->mode |= S_IFREG;
 1128                 /* FALLTHROUGH */
 1129         case S_IFREG:
 1130                 error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
 1131                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
 1132                 if (error == 0)
 1133                         kern_close(td, td->td_retval[0]);
 1134                 break;
 1135 
 1136         default:
 1137                 error = EINVAL;
 1138                 break;
 1139         }
 1140         LFREEPATH(path);
 1141         return (error);
 1142 }
 1143 
 1144 int
 1145 linux_mknodat(struct thread *td, struct linux_mknodat_args *args)
 1146 {
 1147         char *path;
 1148         int error, dfd;
 1149 
 1150         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
 1151         LCONVPATHCREAT_AT(td, args->filename, &path, dfd);
 1152 
 1153 #ifdef DEBUG
 1154         if (ldebug(mknodat))
 1155                 printf(ARGS(mknodat, "%s, %d, %d"), path, args->mode, args->dev);
 1156 #endif
 1157 
 1158         switch (args->mode & S_IFMT) {
 1159         case S_IFIFO:
 1160         case S_IFSOCK:
 1161                 error = kern_mkfifoat(td, dfd, path, UIO_SYSSPACE, args->mode);
 1162                 break;
 1163 
 1164         case S_IFCHR:
 1165         case S_IFBLK:
 1166                 error = kern_mknodat(td, dfd, path, UIO_SYSSPACE, args->mode,
 1167                     args->dev);
 1168                 break;
 1169 
 1170         case S_IFDIR:
 1171                 error = EPERM;
 1172                 break;
 1173 
 1174         case 0:
 1175                 args->mode |= S_IFREG;
 1176                 /* FALLTHROUGH */
 1177         case S_IFREG:
 1178                 error = kern_openat(td, dfd, path, UIO_SYSSPACE,
 1179                     O_WRONLY | O_CREAT | O_TRUNC, args->mode);
 1180                 if (error == 0)
 1181                         kern_close(td, td->td_retval[0]);
 1182                 break;
 1183 
 1184         default:
 1185                 error = EINVAL;
 1186                 break;
 1187         }
 1188         LFREEPATH(path);
 1189         return (error);
 1190 }
 1191 
 1192 /*
 1193  * UGH! This is just about the dumbest idea I've ever heard!!
 1194  */
 1195 int
 1196 linux_personality(struct thread *td, struct linux_personality_args *args)
 1197 {
 1198         struct linux_pemuldata *pem;
 1199         struct proc *p = td->td_proc;
 1200         uint32_t old;
 1201 
 1202 #ifdef DEBUG
 1203         if (ldebug(personality))
 1204                 printf(ARGS(personality, "%u"), args->per);
 1205 #endif
 1206 
 1207         PROC_LOCK(p);
 1208         pem = pem_find(p);
 1209         old = pem->persona;
 1210         if (args->per != 0xffffffff)
 1211                 pem->persona = args->per;
 1212         PROC_UNLOCK(p);
 1213 
 1214         td->td_retval[0] = old;
 1215         return (0);
 1216 }
 1217 
 1218 struct l_itimerval {
 1219         l_timeval it_interval;
 1220         l_timeval it_value;
 1221 };
 1222 
 1223 #define B2L_ITIMERVAL(bip, lip)                                         \
 1224         (bip)->it_interval.tv_sec = (lip)->it_interval.tv_sec;          \
 1225         (bip)->it_interval.tv_usec = (lip)->it_interval.tv_usec;        \
 1226         (bip)->it_value.tv_sec = (lip)->it_value.tv_sec;                \
 1227         (bip)->it_value.tv_usec = (lip)->it_value.tv_usec;
 1228 
 1229 int
 1230 linux_setitimer(struct thread *td, struct linux_setitimer_args *uap)
 1231 {
 1232         int error;
 1233         struct l_itimerval ls;
 1234         struct itimerval aitv, oitv;
 1235 
 1236 #ifdef DEBUG
 1237         if (ldebug(setitimer))
 1238                 printf(ARGS(setitimer, "%p, %p"),
 1239                     (void *)uap->itv, (void *)uap->oitv);
 1240 #endif
 1241 
 1242         if (uap->itv == NULL) {
 1243                 uap->itv = uap->oitv;
 1244                 return (linux_getitimer(td, (struct linux_getitimer_args *)uap));
 1245         }
 1246 
 1247         error = copyin(uap->itv, &ls, sizeof(ls));
 1248         if (error != 0)
 1249                 return (error);
 1250         B2L_ITIMERVAL(&aitv, &ls);
 1251 #ifdef DEBUG
 1252         if (ldebug(setitimer)) {
 1253                 printf("setitimer: value: sec: %jd, usec: %ld\n",
 1254                     (intmax_t)aitv.it_value.tv_sec, aitv.it_value.tv_usec);
 1255                 printf("setitimer: interval: sec: %jd, usec: %ld\n",
 1256                     (intmax_t)aitv.it_interval.tv_sec, aitv.it_interval.tv_usec);
 1257         }
 1258 #endif
 1259         error = kern_setitimer(td, uap->which, &aitv, &oitv);
 1260         if (error != 0 || uap->oitv == NULL)
 1261                 return (error);
 1262         B2L_ITIMERVAL(&ls, &oitv);
 1263 
 1264         return (copyout(&ls, uap->oitv, sizeof(ls)));
 1265 }
 1266 
 1267 int
 1268 linux_getitimer(struct thread *td, struct linux_getitimer_args *uap)
 1269 {
 1270         int error;
 1271         struct l_itimerval ls;
 1272         struct itimerval aitv;
 1273 
 1274 #ifdef DEBUG
 1275         if (ldebug(getitimer))
 1276                 printf(ARGS(getitimer, "%p"), (void *)uap->itv);
 1277 #endif
 1278         error = kern_getitimer(td, uap->which, &aitv);
 1279         if (error != 0)
 1280                 return (error);
 1281         B2L_ITIMERVAL(&ls, &aitv);
 1282         return (copyout(&ls, uap->itv, sizeof(ls)));
 1283 }
 1284 
 1285 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1286 int
 1287 linux_nice(struct thread *td, struct linux_nice_args *args)
 1288 {
 1289         struct setpriority_args bsd_args;
 1290 
 1291         bsd_args.which = PRIO_PROCESS;
 1292         bsd_args.who = 0;               /* current process */
 1293         bsd_args.prio = args->inc;
 1294         return (sys_setpriority(td, &bsd_args));
 1295 }
 1296 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1297 
 1298 int
 1299 linux_setgroups(struct thread *td, struct linux_setgroups_args *args)
 1300 {
 1301         struct ucred *newcred, *oldcred;
 1302         l_gid_t *linux_gidset;
 1303         gid_t *bsd_gidset;
 1304         int ngrp, error;
 1305         struct proc *p;
 1306 
 1307         ngrp = args->gidsetsize;
 1308         if (ngrp < 0 || ngrp >= ngroups_max + 1)
 1309                 return (EINVAL);
 1310         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK);
 1311         error = copyin(args->grouplist, linux_gidset, ngrp * sizeof(l_gid_t));
 1312         if (error)
 1313                 goto out;
 1314         newcred = crget();
 1315         crextend(newcred, ngrp + 1);
 1316         p = td->td_proc;
 1317         PROC_LOCK(p);
 1318         oldcred = p->p_ucred;
 1319         crcopy(newcred, oldcred);
 1320 
 1321         /*
 1322          * cr_groups[0] holds egid. Setting the whole set from
 1323          * the supplied set will cause egid to be changed too.
 1324          * Keep cr_groups[0] unchanged to prevent that.
 1325          */
 1326 
 1327         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
 1328                 PROC_UNLOCK(p);
 1329                 crfree(newcred);
 1330                 goto out;
 1331         }
 1332 
 1333         if (ngrp > 0) {
 1334                 newcred->cr_ngroups = ngrp + 1;
 1335 
 1336                 bsd_gidset = newcred->cr_groups;
 1337                 ngrp--;
 1338                 while (ngrp >= 0) {
 1339                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
 1340                         ngrp--;
 1341                 }
 1342         } else
 1343                 newcred->cr_ngroups = 1;
 1344 
 1345         setsugid(p);
 1346         proc_set_cred(p, newcred);
 1347         PROC_UNLOCK(p);
 1348         crfree(oldcred);
 1349         error = 0;
 1350 out:
 1351         free(linux_gidset, M_LINUX);
 1352         return (error);
 1353 }
 1354 
 1355 int
 1356 linux_getgroups(struct thread *td, struct linux_getgroups_args *args)
 1357 {
 1358         struct ucred *cred;
 1359         l_gid_t *linux_gidset;
 1360         gid_t *bsd_gidset;
 1361         int bsd_gidsetsz, ngrp, error;
 1362 
 1363         cred = td->td_ucred;
 1364         bsd_gidset = cred->cr_groups;
 1365         bsd_gidsetsz = cred->cr_ngroups - 1;
 1366 
 1367         /*
 1368          * cr_groups[0] holds egid. Returning the whole set
 1369          * here will cause a duplicate. Exclude cr_groups[0]
 1370          * to prevent that.
 1371          */
 1372 
 1373         if ((ngrp = args->gidsetsize) == 0) {
 1374                 td->td_retval[0] = bsd_gidsetsz;
 1375                 return (0);
 1376         }
 1377 
 1378         if (ngrp < bsd_gidsetsz)
 1379                 return (EINVAL);
 1380 
 1381         ngrp = 0;
 1382         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
 1383             M_LINUX, M_WAITOK);
 1384         while (ngrp < bsd_gidsetsz) {
 1385                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
 1386                 ngrp++;
 1387         }
 1388 
 1389         error = copyout(linux_gidset, args->grouplist, ngrp * sizeof(l_gid_t));
 1390         free(linux_gidset, M_LINUX);
 1391         if (error)
 1392                 return (error);
 1393 
 1394         td->td_retval[0] = ngrp;
 1395         return (0);
 1396 }
 1397 
 1398 int
 1399 linux_setrlimit(struct thread *td, struct linux_setrlimit_args *args)
 1400 {
 1401         struct rlimit bsd_rlim;
 1402         struct l_rlimit rlim;
 1403         u_int which;
 1404         int error;
 1405 
 1406 #ifdef DEBUG
 1407         if (ldebug(setrlimit))
 1408                 printf(ARGS(setrlimit, "%d, %p"),
 1409                     args->resource, (void *)args->rlim);
 1410 #endif
 1411 
 1412         if (args->resource >= LINUX_RLIM_NLIMITS)
 1413                 return (EINVAL);
 1414 
 1415         which = linux_to_bsd_resource[args->resource];
 1416         if (which == -1)
 1417                 return (EINVAL);
 1418 
 1419         error = copyin(args->rlim, &rlim, sizeof(rlim));
 1420         if (error)
 1421                 return (error);
 1422 
 1423         bsd_rlim.rlim_cur = (rlim_t)rlim.rlim_cur;
 1424         bsd_rlim.rlim_max = (rlim_t)rlim.rlim_max;
 1425         return (kern_setrlimit(td, which, &bsd_rlim));
 1426 }
 1427 
 1428 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1429 int
 1430 linux_old_getrlimit(struct thread *td, struct linux_old_getrlimit_args *args)
 1431 {
 1432         struct l_rlimit rlim;
 1433         struct rlimit bsd_rlim;
 1434         u_int which;
 1435 
 1436 #ifdef DEBUG
 1437         if (ldebug(old_getrlimit))
 1438                 printf(ARGS(old_getrlimit, "%d, %p"),
 1439                     args->resource, (void *)args->rlim);
 1440 #endif
 1441 
 1442         if (args->resource >= LINUX_RLIM_NLIMITS)
 1443                 return (EINVAL);
 1444 
 1445         which = linux_to_bsd_resource[args->resource];
 1446         if (which == -1)
 1447                 return (EINVAL);
 1448 
 1449         lim_rlimit(td, which, &bsd_rlim);
 1450 
 1451 #ifdef COMPAT_LINUX32
 1452         rlim.rlim_cur = (unsigned int)bsd_rlim.rlim_cur;
 1453         if (rlim.rlim_cur == UINT_MAX)
 1454                 rlim.rlim_cur = INT_MAX;
 1455         rlim.rlim_max = (unsigned int)bsd_rlim.rlim_max;
 1456         if (rlim.rlim_max == UINT_MAX)
 1457                 rlim.rlim_max = INT_MAX;
 1458 #else
 1459         rlim.rlim_cur = (unsigned long)bsd_rlim.rlim_cur;
 1460         if (rlim.rlim_cur == ULONG_MAX)
 1461                 rlim.rlim_cur = LONG_MAX;
 1462         rlim.rlim_max = (unsigned long)bsd_rlim.rlim_max;
 1463         if (rlim.rlim_max == ULONG_MAX)
 1464                 rlim.rlim_max = LONG_MAX;
 1465 #endif
 1466         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1467 }
 1468 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1469 
 1470 int
 1471 linux_getrlimit(struct thread *td, struct linux_getrlimit_args *args)
 1472 {
 1473         struct l_rlimit rlim;
 1474         struct rlimit bsd_rlim;
 1475         u_int which;
 1476 
 1477 #ifdef DEBUG
 1478         if (ldebug(getrlimit))
 1479                 printf(ARGS(getrlimit, "%d, %p"),
 1480                     args->resource, (void *)args->rlim);
 1481 #endif
 1482 
 1483         if (args->resource >= LINUX_RLIM_NLIMITS)
 1484                 return (EINVAL);
 1485 
 1486         which = linux_to_bsd_resource[args->resource];
 1487         if (which == -1)
 1488                 return (EINVAL);
 1489 
 1490         lim_rlimit(td, which, &bsd_rlim);
 1491 
 1492         rlim.rlim_cur = (l_ulong)bsd_rlim.rlim_cur;
 1493         rlim.rlim_max = (l_ulong)bsd_rlim.rlim_max;
 1494         return (copyout(&rlim, args->rlim, sizeof(rlim)));
 1495 }
 1496 
 1497 int
 1498 linux_sched_setscheduler(struct thread *td,
 1499     struct linux_sched_setscheduler_args *args)
 1500 {
 1501         struct sched_param sched_param;
 1502         struct thread *tdt;
 1503         int error, policy;
 1504 
 1505 #ifdef DEBUG
 1506         if (ldebug(sched_setscheduler))
 1507                 printf(ARGS(sched_setscheduler, "%d, %d, %p"),
 1508                     args->pid, args->policy, (const void *)args->param);
 1509 #endif
 1510 
 1511         switch (args->policy) {
 1512         case LINUX_SCHED_OTHER:
 1513                 policy = SCHED_OTHER;
 1514                 break;
 1515         case LINUX_SCHED_FIFO:
 1516                 policy = SCHED_FIFO;
 1517                 break;
 1518         case LINUX_SCHED_RR:
 1519                 policy = SCHED_RR;
 1520                 break;
 1521         default:
 1522                 return (EINVAL);
 1523         }
 1524 
 1525         error = copyin(args->param, &sched_param, sizeof(sched_param));
 1526         if (error)
 1527                 return (error);
 1528 
 1529         tdt = linux_tdfind(td, args->pid, -1);
 1530         if (tdt == NULL)
 1531                 return (ESRCH);
 1532 
 1533         error = kern_sched_setscheduler(td, tdt, policy, &sched_param);
 1534         PROC_UNLOCK(tdt->td_proc);
 1535         return (error);
 1536 }
 1537 
 1538 int
 1539 linux_sched_getscheduler(struct thread *td,
 1540     struct linux_sched_getscheduler_args *args)
 1541 {
 1542         struct thread *tdt;
 1543         int error, policy;
 1544 
 1545 #ifdef DEBUG
 1546         if (ldebug(sched_getscheduler))
 1547                 printf(ARGS(sched_getscheduler, "%d"), args->pid);
 1548 #endif
 1549 
 1550         tdt = linux_tdfind(td, args->pid, -1);
 1551         if (tdt == NULL)
 1552                 return (ESRCH);
 1553 
 1554         error = kern_sched_getscheduler(td, tdt, &policy);
 1555         PROC_UNLOCK(tdt->td_proc);
 1556 
 1557         switch (policy) {
 1558         case SCHED_OTHER:
 1559                 td->td_retval[0] = LINUX_SCHED_OTHER;
 1560                 break;
 1561         case SCHED_FIFO:
 1562                 td->td_retval[0] = LINUX_SCHED_FIFO;
 1563                 break;
 1564         case SCHED_RR:
 1565                 td->td_retval[0] = LINUX_SCHED_RR;
 1566                 break;
 1567         }
 1568         return (error);
 1569 }
 1570 
 1571 int
 1572 linux_sched_get_priority_max(struct thread *td,
 1573     struct linux_sched_get_priority_max_args *args)
 1574 {
 1575         struct sched_get_priority_max_args bsd;
 1576 
 1577 #ifdef DEBUG
 1578         if (ldebug(sched_get_priority_max))
 1579                 printf(ARGS(sched_get_priority_max, "%d"), args->policy);
 1580 #endif
 1581 
 1582         switch (args->policy) {
 1583         case LINUX_SCHED_OTHER:
 1584                 bsd.policy = SCHED_OTHER;
 1585                 break;
 1586         case LINUX_SCHED_FIFO:
 1587                 bsd.policy = SCHED_FIFO;
 1588                 break;
 1589         case LINUX_SCHED_RR:
 1590                 bsd.policy = SCHED_RR;
 1591                 break;
 1592         default:
 1593                 return (EINVAL);
 1594         }
 1595         return (sys_sched_get_priority_max(td, &bsd));
 1596 }
 1597 
 1598 int
 1599 linux_sched_get_priority_min(struct thread *td,
 1600     struct linux_sched_get_priority_min_args *args)
 1601 {
 1602         struct sched_get_priority_min_args bsd;
 1603 
 1604 #ifdef DEBUG
 1605         if (ldebug(sched_get_priority_min))
 1606                 printf(ARGS(sched_get_priority_min, "%d"), args->policy);
 1607 #endif
 1608 
 1609         switch (args->policy) {
 1610         case LINUX_SCHED_OTHER:
 1611                 bsd.policy = SCHED_OTHER;
 1612                 break;
 1613         case LINUX_SCHED_FIFO:
 1614                 bsd.policy = SCHED_FIFO;
 1615                 break;
 1616         case LINUX_SCHED_RR:
 1617                 bsd.policy = SCHED_RR;
 1618                 break;
 1619         default:
 1620                 return (EINVAL);
 1621         }
 1622         return (sys_sched_get_priority_min(td, &bsd));
 1623 }
 1624 
 1625 #define REBOOT_CAD_ON   0x89abcdef
 1626 #define REBOOT_CAD_OFF  0
 1627 #define REBOOT_HALT     0xcdef0123
 1628 #define REBOOT_RESTART  0x01234567
 1629 #define REBOOT_RESTART2 0xA1B2C3D4
 1630 #define REBOOT_POWEROFF 0x4321FEDC
 1631 #define REBOOT_MAGIC1   0xfee1dead
 1632 #define REBOOT_MAGIC2   0x28121969
 1633 #define REBOOT_MAGIC2A  0x05121996
 1634 #define REBOOT_MAGIC2B  0x16041998
 1635 
 1636 int
 1637 linux_reboot(struct thread *td, struct linux_reboot_args *args)
 1638 {
 1639         struct reboot_args bsd_args;
 1640 
 1641 #ifdef DEBUG
 1642         if (ldebug(reboot))
 1643                 printf(ARGS(reboot, "0x%x"), args->cmd);
 1644 #endif
 1645 
 1646         if (args->magic1 != REBOOT_MAGIC1)
 1647                 return (EINVAL);
 1648 
 1649         switch (args->magic2) {
 1650         case REBOOT_MAGIC2:
 1651         case REBOOT_MAGIC2A:
 1652         case REBOOT_MAGIC2B:
 1653                 break;
 1654         default:
 1655                 return (EINVAL);
 1656         }
 1657 
 1658         switch (args->cmd) {
 1659         case REBOOT_CAD_ON:
 1660         case REBOOT_CAD_OFF:
 1661                 return (priv_check(td, PRIV_REBOOT));
 1662         case REBOOT_HALT:
 1663                 bsd_args.opt = RB_HALT;
 1664                 break;
 1665         case REBOOT_RESTART:
 1666         case REBOOT_RESTART2:
 1667                 bsd_args.opt = 0;
 1668                 break;
 1669         case REBOOT_POWEROFF:
 1670                 bsd_args.opt = RB_POWEROFF;
 1671                 break;
 1672         default:
 1673                 return (EINVAL);
 1674         }
 1675         return (sys_reboot(td, &bsd_args));
 1676 }
 1677 
 1678 
 1679 /*
 1680  * The FreeBSD native getpid(2), getgid(2) and getuid(2) also modify
 1681  * td->td_retval[1] when COMPAT_43 is defined. This clobbers registers that
 1682  * are assumed to be preserved. The following lightweight syscalls fixes
 1683  * this. See also linux_getgid16() and linux_getuid16() in linux_uid16.c
 1684  *
 1685  * linux_getpid() - MP SAFE
 1686  * linux_getgid() - MP SAFE
 1687  * linux_getuid() - MP SAFE
 1688  */
 1689 
 1690 int
 1691 linux_getpid(struct thread *td, struct linux_getpid_args *args)
 1692 {
 1693 
 1694 #ifdef DEBUG
 1695         if (ldebug(getpid))
 1696                 printf(ARGS(getpid, ""));
 1697 #endif
 1698         td->td_retval[0] = td->td_proc->p_pid;
 1699 
 1700         return (0);
 1701 }
 1702 
 1703 int
 1704 linux_gettid(struct thread *td, struct linux_gettid_args *args)
 1705 {
 1706         struct linux_emuldata *em;
 1707 
 1708 #ifdef DEBUG
 1709         if (ldebug(gettid))
 1710                 printf(ARGS(gettid, ""));
 1711 #endif
 1712 
 1713         em = em_find(td);
 1714         KASSERT(em != NULL, ("gettid: emuldata not found.\n"));
 1715 
 1716         td->td_retval[0] = em->em_tid;
 1717 
 1718         return (0);
 1719 }
 1720 
 1721 
 1722 int
 1723 linux_getppid(struct thread *td, struct linux_getppid_args *args)
 1724 {
 1725 
 1726 #ifdef DEBUG
 1727         if (ldebug(getppid))
 1728                 printf(ARGS(getppid, ""));
 1729 #endif
 1730 
 1731         td->td_retval[0] = kern_getppid(td);
 1732         return (0);
 1733 }
 1734 
 1735 int
 1736 linux_getgid(struct thread *td, struct linux_getgid_args *args)
 1737 {
 1738 
 1739 #ifdef DEBUG
 1740         if (ldebug(getgid))
 1741                 printf(ARGS(getgid, ""));
 1742 #endif
 1743 
 1744         td->td_retval[0] = td->td_ucred->cr_rgid;
 1745         return (0);
 1746 }
 1747 
 1748 int
 1749 linux_getuid(struct thread *td, struct linux_getuid_args *args)
 1750 {
 1751 
 1752 #ifdef DEBUG
 1753         if (ldebug(getuid))
 1754                 printf(ARGS(getuid, ""));
 1755 #endif
 1756 
 1757         td->td_retval[0] = td->td_ucred->cr_ruid;
 1758         return (0);
 1759 }
 1760 
 1761 
 1762 int
 1763 linux_getsid(struct thread *td, struct linux_getsid_args *args)
 1764 {
 1765         struct getsid_args bsd;
 1766 
 1767 #ifdef DEBUG
 1768         if (ldebug(getsid))
 1769                 printf(ARGS(getsid, "%i"), args->pid);
 1770 #endif
 1771 
 1772         bsd.pid = args->pid;
 1773         return (sys_getsid(td, &bsd));
 1774 }
 1775 
 1776 int
 1777 linux_nosys(struct thread *td, struct nosys_args *ignore)
 1778 {
 1779 
 1780         return (ENOSYS);
 1781 }
 1782 
 1783 int
 1784 linux_getpriority(struct thread *td, struct linux_getpriority_args *args)
 1785 {
 1786         struct getpriority_args bsd_args;
 1787         int error;
 1788 
 1789 #ifdef DEBUG
 1790         if (ldebug(getpriority))
 1791                 printf(ARGS(getpriority, "%i, %i"), args->which, args->who);
 1792 #endif
 1793 
 1794         bsd_args.which = args->which;
 1795         bsd_args.who = args->who;
 1796         error = sys_getpriority(td, &bsd_args);
 1797         td->td_retval[0] = 20 - td->td_retval[0];
 1798         return (error);
 1799 }
 1800 
 1801 int
 1802 linux_sethostname(struct thread *td, struct linux_sethostname_args *args)
 1803 {
 1804         int name[2];
 1805 
 1806 #ifdef DEBUG
 1807         if (ldebug(sethostname))
 1808                 printf(ARGS(sethostname, "*, %i"), args->len);
 1809 #endif
 1810 
 1811         name[0] = CTL_KERN;
 1812         name[1] = KERN_HOSTNAME;
 1813         return (userland_sysctl(td, name, 2, 0, 0, 0, args->hostname,
 1814             args->len, 0, 0));
 1815 }
 1816 
 1817 int
 1818 linux_setdomainname(struct thread *td, struct linux_setdomainname_args *args)
 1819 {
 1820         int name[2];
 1821 
 1822 #ifdef DEBUG
 1823         if (ldebug(setdomainname))
 1824                 printf(ARGS(setdomainname, "*, %i"), args->len);
 1825 #endif
 1826 
 1827         name[0] = CTL_KERN;
 1828         name[1] = KERN_NISDOMAINNAME;
 1829         return (userland_sysctl(td, name, 2, 0, 0, 0, args->name,
 1830             args->len, 0, 0));
 1831 }
 1832 
 1833 int
 1834 linux_exit_group(struct thread *td, struct linux_exit_group_args *args)
 1835 {
 1836 
 1837 #ifdef DEBUG
 1838         if (ldebug(exit_group))
 1839                 printf(ARGS(exit_group, "%i"), args->error_code);
 1840 #endif
 1841 
 1842         LINUX_CTR2(exit_group, "thread(%d) (%d)", td->td_tid,
 1843             args->error_code);
 1844 
 1845         /*
 1846          * XXX: we should send a signal to the parent if
 1847          * SIGNAL_EXIT_GROUP is set. We ignore that (temporarily?)
 1848          * as it doesnt occur often.
 1849          */
 1850         exit1(td, args->error_code, 0);
 1851                 /* NOTREACHED */
 1852 }
 1853 
 1854 #define _LINUX_CAPABILITY_VERSION  0x19980330
 1855 
 1856 struct l_user_cap_header {
 1857         l_int   version;
 1858         l_int   pid;
 1859 };
 1860 
 1861 struct l_user_cap_data {
 1862         l_int   effective;
 1863         l_int   permitted;
 1864         l_int   inheritable;
 1865 };
 1866 
 1867 int
 1868 linux_capget(struct thread *td, struct linux_capget_args *args)
 1869 {
 1870         struct l_user_cap_header luch;
 1871         struct l_user_cap_data lucd;
 1872         int error;
 1873 
 1874         if (args->hdrp == NULL)
 1875                 return (EFAULT);
 1876 
 1877         error = copyin(args->hdrp, &luch, sizeof(luch));
 1878         if (error != 0)
 1879                 return (error);
 1880 
 1881         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1882                 luch.version = _LINUX_CAPABILITY_VERSION;
 1883                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1884                 if (error)
 1885                         return (error);
 1886                 return (EINVAL);
 1887         }
 1888 
 1889         if (luch.pid)
 1890                 return (EPERM);
 1891 
 1892         if (args->datap) {
 1893                 /*
 1894                  * The current implementation doesn't support setting
 1895                  * a capability (it's essentially a stub) so indicate
 1896                  * that no capabilities are currently set or available
 1897                  * to request.
 1898                  */
 1899                 bzero (&lucd, sizeof(lucd));
 1900                 error = copyout(&lucd, args->datap, sizeof(lucd));
 1901         }
 1902 
 1903         return (error);
 1904 }
 1905 
 1906 int
 1907 linux_capset(struct thread *td, struct linux_capset_args *args)
 1908 {
 1909         struct l_user_cap_header luch;
 1910         struct l_user_cap_data lucd;
 1911         int error;
 1912 
 1913         if (args->hdrp == NULL || args->datap == NULL)
 1914                 return (EFAULT);
 1915 
 1916         error = copyin(args->hdrp, &luch, sizeof(luch));
 1917         if (error != 0)
 1918                 return (error);
 1919 
 1920         if (luch.version != _LINUX_CAPABILITY_VERSION) {
 1921                 luch.version = _LINUX_CAPABILITY_VERSION;
 1922                 error = copyout(&luch, args->hdrp, sizeof(luch));
 1923                 if (error)
 1924                         return (error);
 1925                 return (EINVAL);
 1926         }
 1927 
 1928         if (luch.pid)
 1929                 return (EPERM);
 1930 
 1931         error = copyin(args->datap, &lucd, sizeof(lucd));
 1932         if (error != 0)
 1933                 return (error);
 1934 
 1935         /* We currently don't support setting any capabilities. */
 1936         if (lucd.effective || lucd.permitted || lucd.inheritable) {
 1937                 linux_msg(td,
 1938                           "capset effective=0x%x, permitted=0x%x, "
 1939                           "inheritable=0x%x is not implemented",
 1940                           (int)lucd.effective, (int)lucd.permitted,
 1941                           (int)lucd.inheritable);
 1942                 return (EPERM);
 1943         }
 1944 
 1945         return (0);
 1946 }
 1947 
 1948 int
 1949 linux_prctl(struct thread *td, struct linux_prctl_args *args)
 1950 {
 1951         int error = 0, max_size;
 1952         struct proc *p = td->td_proc;
 1953         char comm[LINUX_MAX_COMM_LEN];
 1954         struct linux_emuldata *em;
 1955         int pdeath_signal;
 1956 
 1957 #ifdef DEBUG
 1958         if (ldebug(prctl))
 1959                 printf(ARGS(prctl, "%d, %ju, %ju, %ju, %ju"), args->option,
 1960                     (uintmax_t)args->arg2, (uintmax_t)args->arg3,
 1961                     (uintmax_t)args->arg4, (uintmax_t)args->arg5);
 1962 #endif
 1963 
 1964         switch (args->option) {
 1965         case LINUX_PR_SET_PDEATHSIG:
 1966                 if (!LINUX_SIG_VALID(args->arg2))
 1967                         return (EINVAL);
 1968                 em = em_find(td);
 1969                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1970                 em->pdeath_signal = args->arg2;
 1971                 break;
 1972         case LINUX_PR_GET_PDEATHSIG:
 1973                 em = em_find(td);
 1974                 KASSERT(em != NULL, ("prctl: emuldata not found.\n"));
 1975                 pdeath_signal = em->pdeath_signal;
 1976                 error = copyout(&pdeath_signal,
 1977                     (void *)(register_t)args->arg2,
 1978                     sizeof(pdeath_signal));
 1979                 break;
 1980         case LINUX_PR_GET_KEEPCAPS:
 1981                 /*
 1982                  * Indicate that we always clear the effective and
 1983                  * permitted capability sets when the user id becomes
 1984                  * non-zero (actually the capability sets are simply
 1985                  * always zero in the current implementation).
 1986                  */
 1987                 td->td_retval[0] = 0;
 1988                 break;
 1989         case LINUX_PR_SET_KEEPCAPS:
 1990                 /*
 1991                  * Ignore requests to keep the effective and permitted
 1992                  * capability sets when the user id becomes non-zero.
 1993                  */
 1994                 break;
 1995         case LINUX_PR_SET_NAME:
 1996                 /*
 1997                  * To be on the safe side we need to make sure to not
 1998                  * overflow the size a linux program expects. We already
 1999                  * do this here in the copyin, so that we don't need to
 2000                  * check on copyout.
 2001                  */
 2002                 max_size = MIN(sizeof(comm), sizeof(p->p_comm));
 2003                 error = copyinstr((void *)(register_t)args->arg2, comm,
 2004                     max_size, NULL);
 2005 
 2006                 /* Linux silently truncates the name if it is too long. */
 2007                 if (error == ENAMETOOLONG) {
 2008                         /*
 2009                          * XXX: copyinstr() isn't documented to populate the
 2010                          * array completely, so do a copyin() to be on the
 2011                          * safe side. This should be changed in case
 2012                          * copyinstr() is changed to guarantee this.
 2013                          */
 2014                         error = copyin((void *)(register_t)args->arg2, comm,
 2015                             max_size - 1);
 2016                         comm[max_size - 1] = '\0';
 2017                 }
 2018                 if (error)
 2019                         return (error);
 2020 
 2021                 PROC_LOCK(p);
 2022                 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
 2023                 PROC_UNLOCK(p);
 2024                 break;
 2025         case LINUX_PR_GET_NAME:
 2026                 PROC_LOCK(p);
 2027                 strlcpy(comm, p->p_comm, sizeof(comm));
 2028                 PROC_UNLOCK(p);
 2029                 error = copyout(comm, (void *)(register_t)args->arg2,
 2030                     strlen(comm) + 1);
 2031                 break;
 2032         default:
 2033                 error = EINVAL;
 2034                 break;
 2035         }
 2036 
 2037         return (error);
 2038 }
 2039 
 2040 int
 2041 linux_sched_setparam(struct thread *td,
 2042     struct linux_sched_setparam_args *uap)
 2043 {
 2044         struct sched_param sched_param;
 2045         struct thread *tdt;
 2046         int error;
 2047 
 2048 #ifdef DEBUG
 2049         if (ldebug(sched_setparam))
 2050                 printf(ARGS(sched_setparam, "%d, *"), uap->pid);
 2051 #endif
 2052 
 2053         error = copyin(uap->param, &sched_param, sizeof(sched_param));
 2054         if (error)
 2055                 return (error);
 2056 
 2057         tdt = linux_tdfind(td, uap->pid, -1);
 2058         if (tdt == NULL)
 2059                 return (ESRCH);
 2060 
 2061         error = kern_sched_setparam(td, tdt, &sched_param);
 2062         PROC_UNLOCK(tdt->td_proc);
 2063         return (error);
 2064 }
 2065 
 2066 int
 2067 linux_sched_getparam(struct thread *td,
 2068     struct linux_sched_getparam_args *uap)
 2069 {
 2070         struct sched_param sched_param;
 2071         struct thread *tdt;
 2072         int error;
 2073 
 2074 #ifdef DEBUG
 2075         if (ldebug(sched_getparam))
 2076                 printf(ARGS(sched_getparam, "%d, *"), uap->pid);
 2077 #endif
 2078 
 2079         tdt = linux_tdfind(td, uap->pid, -1);
 2080         if (tdt == NULL)
 2081                 return (ESRCH);
 2082 
 2083         error = kern_sched_getparam(td, tdt, &sched_param);
 2084         PROC_UNLOCK(tdt->td_proc);
 2085         if (error == 0)
 2086                 error = copyout(&sched_param, uap->param,
 2087                     sizeof(sched_param));
 2088         return (error);
 2089 }
 2090 
 2091 /*
 2092  * Get affinity of a process.
 2093  */
 2094 int
 2095 linux_sched_getaffinity(struct thread *td,
 2096     struct linux_sched_getaffinity_args *args)
 2097 {
 2098         int error;
 2099         struct thread *tdt;
 2100 
 2101 #ifdef DEBUG
 2102         if (ldebug(sched_getaffinity))
 2103                 printf(ARGS(sched_getaffinity, "%d, %d, *"), args->pid,
 2104                     args->len);
 2105 #endif
 2106         if (args->len < sizeof(cpuset_t))
 2107                 return (EINVAL);
 2108 
 2109         tdt = linux_tdfind(td, args->pid, -1);
 2110         if (tdt == NULL)
 2111                 return (ESRCH);
 2112 
 2113         PROC_UNLOCK(tdt->td_proc);
 2114 
 2115         error = kern_cpuset_getaffinity(td, CPU_LEVEL_WHICH, CPU_WHICH_TID,
 2116             tdt->td_tid, sizeof(cpuset_t), (cpuset_t *)args->user_mask_ptr);
 2117         if (error == 0)
 2118                 td->td_retval[0] = sizeof(cpuset_t);
 2119 
 2120         return (error);
 2121 }
 2122 
 2123 /*
 2124  *  Set affinity of a process.
 2125  */
 2126 int
 2127 linux_sched_setaffinity(struct thread *td,
 2128     struct linux_sched_setaffinity_args *args)
 2129 {
 2130         struct thread *tdt;
 2131 
 2132 #ifdef DEBUG
 2133         if (ldebug(sched_setaffinity))
 2134                 printf(ARGS(sched_setaffinity, "%d, %d, *"), args->pid,
 2135                     args->len);
 2136 #endif
 2137         if (args->len < sizeof(cpuset_t))
 2138                 return (EINVAL);
 2139 
 2140         tdt = linux_tdfind(td, args->pid, -1);
 2141         if (tdt == NULL)
 2142                 return (ESRCH);
 2143 
 2144         PROC_UNLOCK(tdt->td_proc);
 2145 
 2146         return (kern_cpuset_setaffinity(td, CPU_LEVEL_WHICH, CPU_WHICH_TID,
 2147             tdt->td_tid, sizeof(cpuset_t), (cpuset_t *) args->user_mask_ptr));
 2148 }
 2149 
 2150 struct linux_rlimit64 {
 2151         uint64_t        rlim_cur;
 2152         uint64_t        rlim_max;
 2153 };
 2154 
 2155 int
 2156 linux_prlimit64(struct thread *td, struct linux_prlimit64_args *args)
 2157 {
 2158         struct rlimit rlim, nrlim;
 2159         struct linux_rlimit64 lrlim;
 2160         struct proc *p;
 2161         u_int which;
 2162         int flags;
 2163         int error;
 2164 
 2165 #ifdef DEBUG
 2166         if (ldebug(prlimit64))
 2167                 printf(ARGS(prlimit64, "%d, %d, %p, %p"), args->pid,
 2168                     args->resource, (void *)args->new, (void *)args->old);
 2169 #endif
 2170 
 2171         if (args->resource >= LINUX_RLIM_NLIMITS)
 2172                 return (EINVAL);
 2173 
 2174         which = linux_to_bsd_resource[args->resource];
 2175         if (which == -1)
 2176                 return (EINVAL);
 2177 
 2178         if (args->new != NULL) {
 2179                 /*
 2180                  * Note. Unlike FreeBSD where rlim is signed 64-bit Linux
 2181                  * rlim is unsigned 64-bit. FreeBSD treats negative limits
 2182                  * as INFINITY so we do not need a conversion even.
 2183                  */
 2184                 error = copyin(args->new, &nrlim, sizeof(nrlim));
 2185                 if (error != 0)
 2186                         return (error);
 2187         }
 2188 
 2189         flags = PGET_HOLD | PGET_NOTWEXIT;
 2190         if (args->new != NULL)
 2191                 flags |= PGET_CANDEBUG;
 2192         else
 2193                 flags |= PGET_CANSEE;
 2194         error = pget(args->pid, flags, &p);
 2195         if (error != 0)
 2196                 return (error);
 2197 
 2198         if (args->old != NULL) {
 2199                 PROC_LOCK(p);
 2200                 lim_rlimit_proc(p, which, &rlim);
 2201                 PROC_UNLOCK(p);
 2202                 if (rlim.rlim_cur == RLIM_INFINITY)
 2203                         lrlim.rlim_cur = LINUX_RLIM_INFINITY;
 2204                 else
 2205                         lrlim.rlim_cur = rlim.rlim_cur;
 2206                 if (rlim.rlim_max == RLIM_INFINITY)
 2207                         lrlim.rlim_max = LINUX_RLIM_INFINITY;
 2208                 else
 2209                         lrlim.rlim_max = rlim.rlim_max;
 2210                 error = copyout(&lrlim, args->old, sizeof(lrlim));
 2211                 if (error != 0)
 2212                         goto out;
 2213         }
 2214 
 2215         if (args->new != NULL)
 2216                 error = kern_proc_setrlimit(td, p, which, &nrlim);
 2217 
 2218  out:
 2219         PRELE(p);
 2220         return (error);
 2221 }
 2222 
 2223 int
 2224 linux_pselect6(struct thread *td, struct linux_pselect6_args *args)
 2225 {
 2226         struct timeval utv, tv0, tv1, *tvp;
 2227         struct l_pselect6arg lpse6;
 2228         struct l_timespec lts;
 2229         struct timespec uts;
 2230         l_sigset_t l_ss;
 2231         sigset_t *ssp;
 2232         sigset_t ss;
 2233         int error;
 2234 
 2235         ssp = NULL;
 2236         if (args->sig != NULL) {
 2237                 error = copyin(args->sig, &lpse6, sizeof(lpse6));
 2238                 if (error != 0)
 2239                         return (error);
 2240                 if (lpse6.ss_len != sizeof(l_ss))
 2241                         return (EINVAL);
 2242                 if (lpse6.ss != 0) {
 2243                         error = copyin(PTRIN(lpse6.ss), &l_ss,
 2244                             sizeof(l_ss));
 2245                         if (error != 0)
 2246                                 return (error);
 2247                         linux_to_bsd_sigset(&l_ss, &ss);
 2248                         ssp = &ss;
 2249                 }
 2250         }
 2251 
 2252         /*
 2253          * Currently glibc changes nanosecond number to microsecond.
 2254          * This mean losing precision but for now it is hardly seen.
 2255          */
 2256         if (args->tsp != NULL) {
 2257                 error = copyin(args->tsp, &lts, sizeof(lts));
 2258                 if (error != 0)
 2259                         return (error);
 2260                 error = linux_to_native_timespec(&uts, &lts);
 2261                 if (error != 0)
 2262                         return (error);
 2263 
 2264                 TIMESPEC_TO_TIMEVAL(&utv, &uts);
 2265                 if (itimerfix(&utv))
 2266                         return (EINVAL);
 2267 
 2268                 microtime(&tv0);
 2269                 tvp = &utv;
 2270         } else
 2271                 tvp = NULL;
 2272 
 2273         error = kern_pselect(td, args->nfds, args->readfds, args->writefds,
 2274             args->exceptfds, tvp, ssp, LINUX_NFDBITS);
 2275 
 2276         if (error == 0 && args->tsp != NULL) {
 2277                 if (td->td_retval[0] != 0) {
 2278                         /*
 2279                          * Compute how much time was left of the timeout,
 2280                          * by subtracting the current time and the time
 2281                          * before we started the call, and subtracting
 2282                          * that result from the user-supplied value.
 2283                          */
 2284 
 2285                         microtime(&tv1);
 2286                         timevalsub(&tv1, &tv0);
 2287                         timevalsub(&utv, &tv1);
 2288                         if (utv.tv_sec < 0)
 2289                                 timevalclear(&utv);
 2290                 } else
 2291                         timevalclear(&utv);
 2292 
 2293                 TIMEVAL_TO_TIMESPEC(&utv, &uts);
 2294 
 2295                 error = native_to_linux_timespec(&lts, &uts);
 2296                 if (error == 0)
 2297                         error = copyout(&lts, args->tsp, sizeof(lts));
 2298         }
 2299 
 2300         return (error);
 2301 }
 2302 
 2303 int
 2304 linux_ppoll(struct thread *td, struct linux_ppoll_args *args)
 2305 {
 2306         struct timespec ts0, ts1;
 2307         struct l_timespec lts;
 2308         struct timespec uts, *tsp;
 2309         l_sigset_t l_ss;
 2310         sigset_t *ssp;
 2311         sigset_t ss;
 2312         int error;
 2313 
 2314         if (args->sset != NULL) {
 2315                 if (args->ssize != sizeof(l_ss))
 2316                         return (EINVAL);
 2317                 error = copyin(args->sset, &l_ss, sizeof(l_ss));
 2318                 if (error)
 2319                         return (error);
 2320                 linux_to_bsd_sigset(&l_ss, &ss);
 2321                 ssp = &ss;
 2322         } else
 2323                 ssp = NULL;
 2324         if (args->tsp != NULL) {
 2325                 error = copyin(args->tsp, &lts, sizeof(lts));
 2326                 if (error)
 2327                         return (error);
 2328                 error = linux_to_native_timespec(&uts, &lts);
 2329                 if (error != 0)
 2330                         return (error);
 2331 
 2332                 nanotime(&ts0);
 2333                 tsp = &uts;
 2334         } else
 2335                 tsp = NULL;
 2336 
 2337         error = kern_poll(td, args->fds, args->nfds, tsp, ssp);
 2338 
 2339         if (error == 0 && args->tsp != NULL) {
 2340                 if (td->td_retval[0]) {
 2341                         nanotime(&ts1);
 2342                         timespecsub(&ts1, &ts0);
 2343                         timespecsub(&uts, &ts1);
 2344                         if (uts.tv_sec < 0)
 2345                                 timespecclear(&uts);
 2346                 } else
 2347                         timespecclear(&uts);
 2348 
 2349                 error = native_to_linux_timespec(&lts, &uts);
 2350                 if (error == 0)
 2351                         error = copyout(&lts, args->tsp, sizeof(lts));
 2352         }
 2353 
 2354         return (error);
 2355 }
 2356 
 2357 #if defined(DEBUG) || defined(KTR)
 2358 /* XXX: can be removed when every ldebug(...) and KTR stuff are removed. */
 2359 
 2360 #ifdef COMPAT_LINUX32
 2361 #define L_MAXSYSCALL    LINUX32_SYS_MAXSYSCALL
 2362 #else
 2363 #define L_MAXSYSCALL    LINUX_SYS_MAXSYSCALL
 2364 #endif
 2365 
 2366 u_char linux_debug_map[howmany(L_MAXSYSCALL, sizeof(u_char))];
 2367 
 2368 static int
 2369 linux_debug(int syscall, int toggle, int global)
 2370 {
 2371 
 2372         if (global) {
 2373                 char c = toggle ? 0 : 0xff;
 2374 
 2375                 memset(linux_debug_map, c, sizeof(linux_debug_map));
 2376                 return (0);
 2377         }
 2378         if (syscall < 0 || syscall >= L_MAXSYSCALL)
 2379                 return (EINVAL);
 2380         if (toggle)
 2381                 clrbit(linux_debug_map, syscall);
 2382         else
 2383                 setbit(linux_debug_map, syscall);
 2384         return (0);
 2385 }
 2386 #undef L_MAXSYSCALL
 2387 
 2388 /*
 2389  * Usage: sysctl linux.debug=<syscall_nr>.<0/1>
 2390  *
 2391  *    E.g.: sysctl linux.debug=21.0
 2392  *
 2393  * As a special case, syscall "all" will apply to all syscalls globally.
 2394  */
 2395 #define LINUX_MAX_DEBUGSTR      16
 2396 int
 2397 linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
 2398 {
 2399         char value[LINUX_MAX_DEBUGSTR], *p;
 2400         int error, sysc, toggle;
 2401         int global = 0;
 2402 
 2403         value[0] = '\0';
 2404         error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
 2405         if (error || req->newptr == NULL)
 2406                 return (error);
 2407         for (p = value; *p != '\0' && *p != '.'; p++);
 2408         if (*p == '\0')
 2409                 return (EINVAL);
 2410         *p++ = '\0';
 2411         sysc = strtol(value, NULL, 0);
 2412         toggle = strtol(p, NULL, 0);
 2413         if (strcmp(value, "all") == 0)
 2414                 global = 1;
 2415         error = linux_debug(sysc, toggle, global);
 2416         return (error);
 2417 }
 2418 
 2419 #endif /* DEBUG || KTR */
 2420 
 2421 int
 2422 linux_sched_rr_get_interval(struct thread *td,
 2423     struct linux_sched_rr_get_interval_args *uap)
 2424 {
 2425         struct timespec ts;
 2426         struct l_timespec lts;
 2427         struct thread *tdt;
 2428         int error;
 2429 
 2430         /*
 2431          * According to man in case the invalid pid specified
 2432          * EINVAL should be returned.
 2433          */
 2434         if (uap->pid < 0)
 2435                 return (EINVAL);
 2436 
 2437         tdt = linux_tdfind(td, uap->pid, -1);
 2438         if (tdt == NULL)
 2439                 return (ESRCH);
 2440 
 2441         error = kern_sched_rr_get_interval_td(td, tdt, &ts);
 2442         PROC_UNLOCK(tdt->td_proc);
 2443         if (error != 0)
 2444                 return (error);
 2445         error = native_to_linux_timespec(&lts, &ts);
 2446         if (error != 0)
 2447                 return (error);
 2448         return (copyout(&lts, uap->interval, sizeof(lts)));
 2449 }
 2450 
 2451 /*
 2452  * In case when the Linux thread is the initial thread in
 2453  * the thread group thread id is equal to the process id.
 2454  * Glibc depends on this magic (assert in pthread_getattr_np.c).
 2455  */
 2456 struct thread *
 2457 linux_tdfind(struct thread *td, lwpid_t tid, pid_t pid)
 2458 {
 2459         struct linux_emuldata *em;
 2460         struct thread *tdt;
 2461         struct proc *p;
 2462 
 2463         tdt = NULL;
 2464         if (tid == 0 || tid == td->td_tid) {
 2465                 tdt = td;
 2466                 PROC_LOCK(tdt->td_proc);
 2467         } else if (tid > PID_MAX)
 2468                 tdt = tdfind(tid, pid);
 2469         else {
 2470                 /*
 2471                  * Initial thread where the tid equal to the pid.
 2472                  */
 2473                 p = pfind(tid);
 2474                 if (p != NULL) {
 2475                         if (SV_PROC_ABI(p) != SV_ABI_LINUX) {
 2476                                 /*
 2477                                  * p is not a Linuxulator process.
 2478                                  */
 2479                                 PROC_UNLOCK(p);
 2480                                 return (NULL);
 2481                         }
 2482                         FOREACH_THREAD_IN_PROC(p, tdt) {
 2483                                 em = em_find(tdt);
 2484                                 if (tid == em->em_tid)
 2485                                         return (tdt);
 2486                         }
 2487                         PROC_UNLOCK(p);
 2488                 }
 2489                 return (NULL);
 2490         }
 2491 
 2492         return (tdt);
 2493 }
 2494 
 2495 void
 2496 linux_to_bsd_waitopts(int options, int *bsdopts)
 2497 {
 2498 
 2499         if (options & LINUX_WNOHANG)
 2500                 *bsdopts |= WNOHANG;
 2501         if (options & LINUX_WUNTRACED)
 2502                 *bsdopts |= WUNTRACED;
 2503         if (options & LINUX_WEXITED)
 2504                 *bsdopts |= WEXITED;
 2505         if (options & LINUX_WCONTINUED)
 2506                 *bsdopts |= WCONTINUED;
 2507         if (options & LINUX_WNOWAIT)
 2508                 *bsdopts |= WNOWAIT;
 2509 
 2510         if (options & __WCLONE)
 2511                 *bsdopts |= WLINUXCLONE;
 2512 }
 2513 
 2514 int
 2515 linux_getrandom(struct thread *td, struct linux_getrandom_args *args)
 2516 {
 2517         struct uio uio;
 2518         struct iovec iov;
 2519         int error;
 2520 
 2521         if (args->flags & ~(LINUX_GRND_NONBLOCK|LINUX_GRND_RANDOM))
 2522                 return (EINVAL);
 2523         if (args->count > INT_MAX)
 2524                 args->count = INT_MAX;
 2525 
 2526         iov.iov_base = args->buf;
 2527         iov.iov_len = args->count;
 2528 
 2529         uio.uio_iov = &iov;
 2530         uio.uio_iovcnt = 1;
 2531         uio.uio_resid = iov.iov_len;
 2532         uio.uio_segflg = UIO_USERSPACE;
 2533         uio.uio_rw = UIO_READ;
 2534         uio.uio_td = td;
 2535 
 2536         error = read_random_uio(&uio, args->flags & LINUX_GRND_NONBLOCK);
 2537         if (error == 0)
 2538                 td->td_retval[0] = args->count - uio.uio_resid;
 2539         return (error);
 2540 }
 2541 
 2542 int
 2543 linux_mincore(struct thread *td, struct linux_mincore_args *args)
 2544 {
 2545 
 2546         /* Needs to be page-aligned */
 2547         if (args->start & PAGE_MASK)
 2548                 return (EINVAL);
 2549         return (kern_mincore(td, args->start, args->len, args->vec));
 2550 }

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