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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1994-1995 Søren Schmidt
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_compat.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/capsicum.h>
   37 #include <sys/conf.h>
   38 #include <sys/dirent.h>
   39 #include <sys/fcntl.h>
   40 #include <sys/file.h>
   41 #include <sys/filedesc.h>
   42 #include <sys/lock.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mount.h>
   45 #include <sys/mutex.h>
   46 #include <sys/namei.h>
   47 #include <sys/proc.h>
   48 #include <sys/stat.h>
   49 #include <sys/sx.h>
   50 #include <sys/syscallsubr.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/tty.h>
   53 #include <sys/unistd.h>
   54 #include <sys/vnode.h>
   55 
   56 #ifdef COMPAT_LINUX32
   57 #include <machine/../linux32/linux.h>
   58 #include <machine/../linux32/linux32_proto.h>
   59 #else
   60 #include <machine/../linux/linux.h>
   61 #include <machine/../linux/linux_proto.h>
   62 #endif
   63 #include <compat/linux/linux_misc.h>
   64 #include <compat/linux/linux_util.h>
   65 #include <compat/linux/linux_file.h>
   66 
   67 static int      linux_common_open(struct thread *, int, char *, int, int);
   68 static int      linux_getdents_error(struct thread *, int, int);
   69 
   70 
   71 #ifdef LINUX_LEGACY_SYSCALLS
   72 int
   73 linux_creat(struct thread *td, struct linux_creat_args *args)
   74 {
   75         char *path;
   76         int error;
   77 
   78         LCONVPATHEXIST(td, args->path, &path);
   79 #ifdef DEBUG
   80         if (ldebug(creat))
   81                 printf(ARGS(creat, "%s, %d"), path, args->mode);
   82 #endif
   83         error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
   84             O_WRONLY | O_CREAT | O_TRUNC, args->mode);
   85         LFREEPATH(path);
   86         return (error);
   87 }
   88 #endif
   89 
   90 static int
   91 linux_common_open(struct thread *td, int dirfd, char *path, int l_flags, int mode)
   92 {
   93         cap_rights_t rights;
   94         struct proc *p = td->td_proc;
   95         struct file *fp;
   96         int fd;
   97         int bsd_flags, error;
   98 
   99         bsd_flags = 0;
  100         switch (l_flags & LINUX_O_ACCMODE) {
  101         case LINUX_O_WRONLY:
  102                 bsd_flags |= O_WRONLY;
  103                 break;
  104         case LINUX_O_RDWR:
  105                 bsd_flags |= O_RDWR;
  106                 break;
  107         default:
  108                 bsd_flags |= O_RDONLY;
  109         }
  110         if (l_flags & LINUX_O_NDELAY)
  111                 bsd_flags |= O_NONBLOCK;
  112         if (l_flags & LINUX_O_APPEND)
  113                 bsd_flags |= O_APPEND;
  114         if (l_flags & LINUX_O_SYNC)
  115                 bsd_flags |= O_FSYNC;
  116         if (l_flags & LINUX_O_NONBLOCK)
  117                 bsd_flags |= O_NONBLOCK;
  118         if (l_flags & LINUX_FASYNC)
  119                 bsd_flags |= O_ASYNC;
  120         if (l_flags & LINUX_O_CREAT)
  121                 bsd_flags |= O_CREAT;
  122         if (l_flags & LINUX_O_TRUNC)
  123                 bsd_flags |= O_TRUNC;
  124         if (l_flags & LINUX_O_EXCL)
  125                 bsd_flags |= O_EXCL;
  126         if (l_flags & LINUX_O_NOCTTY)
  127                 bsd_flags |= O_NOCTTY;
  128         if (l_flags & LINUX_O_DIRECT)
  129                 bsd_flags |= O_DIRECT;
  130         if (l_flags & LINUX_O_NOFOLLOW)
  131                 bsd_flags |= O_NOFOLLOW;
  132         if (l_flags & LINUX_O_DIRECTORY)
  133                 bsd_flags |= O_DIRECTORY;
  134         /* XXX LINUX_O_NOATIME: unable to be easily implemented. */
  135 
  136         error = kern_openat(td, dirfd, path, UIO_SYSSPACE, bsd_flags, mode);
  137         if (error != 0)
  138                 goto done;
  139         if (bsd_flags & O_NOCTTY)
  140                 goto done;
  141 
  142         /*
  143          * XXX In between kern_open() and fget(), another process
  144          * having the same filedesc could use that fd without
  145          * checking below.
  146         */
  147         fd = td->td_retval[0];
  148         if (fget(td, fd, cap_rights_init(&rights, CAP_IOCTL), &fp) == 0) {
  149                 if (fp->f_type != DTYPE_VNODE) {
  150                         fdrop(fp, td);
  151                         goto done;
  152                 }
  153                 sx_slock(&proctree_lock);
  154                 PROC_LOCK(p);
  155                 if (SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
  156                         PROC_UNLOCK(p);
  157                         sx_sunlock(&proctree_lock);
  158                         /* XXXPJD: Verify if TIOCSCTTY is allowed. */
  159                         (void) fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0,
  160                             td->td_ucred, td);
  161                 } else {
  162                         PROC_UNLOCK(p);
  163                         sx_sunlock(&proctree_lock);
  164                 }
  165                 fdrop(fp, td);
  166         }
  167 
  168 done:
  169 #ifdef DEBUG
  170 #ifdef LINUX_LEGACY_SYSCALLS
  171         if (ldebug(open))
  172 #else
  173         if (ldebug(openat))
  174 #endif
  175                 printf(LMSG("open returns error %d"), error);
  176 #endif
  177         LFREEPATH(path);
  178         return (error);
  179 }
  180 
  181 int
  182 linux_openat(struct thread *td, struct linux_openat_args *args)
  183 {
  184         char *path;
  185         int dfd;
  186 
  187         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  188         if (args->flags & LINUX_O_CREAT)
  189                 LCONVPATH_AT(td, args->filename, &path, 1, dfd);
  190         else
  191                 LCONVPATH_AT(td, args->filename, &path, 0, dfd);
  192 #ifdef DEBUG
  193         if (ldebug(openat))
  194                 printf(ARGS(openat, "%i, %s, 0x%x, 0x%x"), args->dfd,
  195                     path, args->flags, args->mode);
  196 #endif
  197         return (linux_common_open(td, dfd, path, args->flags, args->mode));
  198 }
  199 
  200 #ifdef LINUX_LEGACY_SYSCALLS
  201 int
  202 linux_open(struct thread *td, struct linux_open_args *args)
  203 {
  204         char *path;
  205 
  206         if (args->flags & LINUX_O_CREAT)
  207                 LCONVPATHCREAT(td, args->path, &path);
  208         else
  209                 LCONVPATHEXIST(td, args->path, &path);
  210 #ifdef DEBUG
  211         if (ldebug(open))
  212                 printf(ARGS(open, "%s, 0x%x, 0x%x"),
  213                     path, args->flags, args->mode);
  214 #endif
  215         return (linux_common_open(td, AT_FDCWD, path, args->flags, args->mode));
  216 }
  217 #endif
  218 
  219 int
  220 linux_lseek(struct thread *td, struct linux_lseek_args *args)
  221 {
  222 
  223 #ifdef DEBUG
  224         if (ldebug(lseek))
  225                 printf(ARGS(lseek, "%d, %ld, %d"),
  226                     args->fdes, (long)args->off, args->whence);
  227 #endif
  228         return (kern_lseek(td, args->fdes, args->off, args->whence));
  229 }
  230 
  231 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  232 int
  233 linux_llseek(struct thread *td, struct linux_llseek_args *args)
  234 {
  235         int error;
  236         off_t off;
  237 
  238 #ifdef DEBUG
  239         if (ldebug(llseek))
  240                 printf(ARGS(llseek, "%d, %d:%d, %d"),
  241                     args->fd, args->ohigh, args->olow, args->whence);
  242 #endif
  243         off = (args->olow) | (((off_t) args->ohigh) << 32);
  244 
  245         error = kern_lseek(td, args->fd, off, args->whence);
  246         if (error != 0)
  247                 return (error);
  248 
  249         error = copyout(td->td_retval, args->res, sizeof(off_t));
  250         if (error != 0)
  251                 return (error);
  252 
  253         td->td_retval[0] = 0;
  254         return (0);
  255 }
  256 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  257 
  258 /*
  259  * Note that linux_getdents(2) and linux_getdents64(2) have the same
  260  * arguments. They only differ in the definition of struct dirent they
  261  * operate on.
  262  * Note that linux_readdir(2) is a special case of linux_getdents(2)
  263  * where count is always equals 1, meaning that the buffer is one
  264  * dirent-structure in size and that the code can't handle more anyway.
  265  * Note that linux_readdir(2) can't be implemented by means of linux_getdents(2)
  266  * as in case when the *dent buffer size is equal to 1 linux_getdents(2) will
  267  * trash user stack.
  268  */
  269 
  270 static int
  271 linux_getdents_error(struct thread *td, int fd, int err)
  272 {
  273         cap_rights_t rights;
  274         struct vnode *vp;
  275         struct file *fp;
  276         int error;
  277 
  278         /* Linux return ENOTDIR in case when fd is not a directory. */
  279         error = getvnode(td, fd, cap_rights_init(&rights, CAP_READ), &fp);
  280         if (error != 0)
  281                 return (error);
  282         vp = fp->f_vnode;
  283         if (vp->v_type != VDIR) {
  284                 fdrop(fp, td);
  285                 return (ENOTDIR);
  286         }
  287         fdrop(fp, td);
  288         return (err);
  289 }
  290 
  291 struct l_dirent {
  292         l_ulong         d_ino;
  293         l_off_t         d_off;
  294         l_ushort        d_reclen;
  295         char            d_name[LINUX_NAME_MAX + 1];
  296 };
  297 
  298 struct l_dirent64 {
  299         uint64_t        d_ino;
  300         int64_t         d_off;
  301         l_ushort        d_reclen;
  302         u_char          d_type;
  303         char            d_name[LINUX_NAME_MAX + 1];
  304 };
  305 
  306 /*
  307  * Linux uses the last byte in the dirent buffer to store d_type,
  308  * at least glibc-2.7 requires it. That is why l_dirent is padded with 2 bytes.
  309  */
  310 #define LINUX_RECLEN(namlen)                                            \
  311     roundup(offsetof(struct l_dirent, d_name) + (namlen) + 2, sizeof(l_ulong))
  312 
  313 #define LINUX_RECLEN64(namlen)                                          \
  314     roundup(offsetof(struct l_dirent64, d_name) + (namlen) + 1,         \
  315     sizeof(uint64_t))
  316 
  317 /*
  318  * Linux l_dirent is bigger than FreeBSD dirent, thus the buffer size
  319  * passed to kern_getdirentries() must be smaller than the one passed
  320  * to linux_getdents() by certain factor.
  321  */
  322 #define LINUX_RECLEN_RATIO(X)   X * offsetof(struct dirent, d_name) /   \
  323     offsetof(struct l_dirent, d_name);
  324 #define LINUX_RECLEN64_RATIO(X) X * offsetof(struct dirent, d_name) /   \
  325     offsetof(struct l_dirent64, d_name);
  326 
  327 #ifdef LINUX_LEGACY_SYSCALLS
  328 int
  329 linux_getdents(struct thread *td, struct linux_getdents_args *args)
  330 {
  331         struct dirent *bdp;
  332         caddr_t inp, buf;               /* BSD-format */
  333         int len, reclen;                /* BSD-format */
  334         caddr_t outp;                   /* Linux-format */
  335         int resid, linuxreclen;         /* Linux-format */
  336         caddr_t lbuf;                   /* Linux-format */
  337         long base;
  338         struct l_dirent *linux_dirent;
  339         int buflen, error;
  340         size_t retval;
  341 
  342 #ifdef DEBUG
  343         if (ldebug(getdents))
  344                 printf(ARGS(getdents, "%d, *, %d"), args->fd, args->count);
  345 #endif
  346         buflen = LINUX_RECLEN_RATIO(args->count);
  347         buflen = min(buflen, MAXBSIZE);
  348         buf = malloc(buflen, M_TEMP, M_WAITOK);
  349 
  350         error = kern_getdirentries(td, args->fd, buf, buflen,
  351             &base, NULL, UIO_SYSSPACE);
  352         if (error != 0) {
  353                 error = linux_getdents_error(td, args->fd, error);
  354                 goto out1;
  355         }
  356 
  357         lbuf = malloc(LINUX_RECLEN(LINUX_NAME_MAX), M_TEMP, M_WAITOK | M_ZERO);
  358 
  359         len = td->td_retval[0];
  360         inp = buf;
  361         outp = (caddr_t)args->dent;
  362         resid = args->count;
  363         retval = 0;
  364 
  365         while (len > 0) {
  366                 bdp = (struct dirent *) inp;
  367                 reclen = bdp->d_reclen;
  368                 linuxreclen = LINUX_RECLEN(bdp->d_namlen);
  369                 /*
  370                  * No more space in the user supplied dirent buffer.
  371                  * Return EINVAL.
  372                  */
  373                 if (resid < linuxreclen) {
  374                         error = EINVAL;
  375                         goto out;
  376                 }
  377 
  378                 linux_dirent = (struct l_dirent*)lbuf;
  379                 linux_dirent->d_ino = bdp->d_fileno;
  380                 linux_dirent->d_off = base + reclen;
  381                 linux_dirent->d_reclen = linuxreclen;
  382                 /*
  383                  * Copy d_type to last byte of l_dirent buffer
  384                  */
  385                 lbuf[linuxreclen - 1] = bdp->d_type;
  386                 strlcpy(linux_dirent->d_name, bdp->d_name,
  387                     linuxreclen - offsetof(struct l_dirent, d_name)-1);
  388                 error = copyout(linux_dirent, outp, linuxreclen);
  389                 if (error != 0)
  390                         goto out;
  391 
  392                 inp += reclen;
  393                 base += reclen;
  394                 len -= reclen;
  395 
  396                 retval += linuxreclen;
  397                 outp += linuxreclen;
  398                 resid -= linuxreclen;
  399         }
  400         td->td_retval[0] = retval;
  401 
  402 out:
  403         free(lbuf, M_TEMP);
  404 out1:
  405         free(buf, M_TEMP);
  406         return (error);
  407 }
  408 #endif
  409 
  410 int
  411 linux_getdents64(struct thread *td, struct linux_getdents64_args *args)
  412 {
  413         struct dirent *bdp;
  414         caddr_t inp, buf;               /* BSD-format */
  415         int len, reclen;                /* BSD-format */
  416         caddr_t outp;                   /* Linux-format */
  417         int resid, linuxreclen;         /* Linux-format */
  418         caddr_t lbuf;                   /* Linux-format */
  419         long base;
  420         struct l_dirent64 *linux_dirent64;
  421         int buflen, error;
  422         size_t retval;
  423 
  424 #ifdef DEBUG
  425         if (ldebug(getdents64))
  426                 uprintf(ARGS(getdents64, "%d, *, %d"), args->fd, args->count);
  427 #endif
  428         buflen = LINUX_RECLEN64_RATIO(args->count);
  429         buflen = min(buflen, MAXBSIZE);
  430         buf = malloc(buflen, M_TEMP, M_WAITOK);
  431 
  432         error = kern_getdirentries(td, args->fd, buf, buflen,
  433             &base, NULL, UIO_SYSSPACE);
  434         if (error != 0) {
  435                 error = linux_getdents_error(td, args->fd, error);
  436                 goto out1;
  437         }
  438 
  439         lbuf = malloc(LINUX_RECLEN64(LINUX_NAME_MAX), M_TEMP, M_WAITOK | M_ZERO);
  440 
  441         len = td->td_retval[0];
  442         inp = buf;
  443         outp = (caddr_t)args->dirent;
  444         resid = args->count;
  445         retval = 0;
  446 
  447         while (len > 0) {
  448                 bdp = (struct dirent *) inp;
  449                 reclen = bdp->d_reclen;
  450                 linuxreclen = LINUX_RECLEN64(bdp->d_namlen);
  451                 /*
  452                  * No more space in the user supplied dirent buffer.
  453                  * Return EINVAL.
  454                  */
  455                 if (resid < linuxreclen) {
  456                         error = EINVAL;
  457                         goto out;
  458                 }
  459 
  460                 linux_dirent64 = (struct l_dirent64*)lbuf;
  461                 linux_dirent64->d_ino = bdp->d_fileno;
  462                 linux_dirent64->d_off = base + reclen;
  463                 linux_dirent64->d_reclen = linuxreclen;
  464                 linux_dirent64->d_type = bdp->d_type;
  465                 strlcpy(linux_dirent64->d_name, bdp->d_name,
  466                     linuxreclen - offsetof(struct l_dirent64, d_name));
  467                 error = copyout(linux_dirent64, outp, linuxreclen);
  468                 if (error != 0)
  469                         goto out;
  470 
  471                 inp += reclen;
  472                 base += reclen;
  473                 len -= reclen;
  474 
  475                 retval += linuxreclen;
  476                 outp += linuxreclen;
  477                 resid -= linuxreclen;
  478         }
  479         td->td_retval[0] = retval;
  480 
  481 out:
  482         free(lbuf, M_TEMP);
  483 out1:
  484         free(buf, M_TEMP);
  485         return (error);
  486 }
  487 
  488 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  489 int
  490 linux_readdir(struct thread *td, struct linux_readdir_args *args)
  491 {
  492         struct dirent *bdp;
  493         caddr_t buf;                    /* BSD-format */
  494         int linuxreclen;                /* Linux-format */
  495         caddr_t lbuf;                   /* Linux-format */
  496         long base;
  497         struct l_dirent *linux_dirent;
  498         int buflen, error;
  499 
  500 #ifdef DEBUG
  501         if (ldebug(readdir))
  502                 printf(ARGS(readdir, "%d, *"), args->fd);
  503 #endif
  504         buflen = LINUX_RECLEN(LINUX_NAME_MAX);
  505         buflen = LINUX_RECLEN_RATIO(buflen);
  506         buf = malloc(buflen, M_TEMP, M_WAITOK);
  507 
  508         error = kern_getdirentries(td, args->fd, buf, buflen,
  509             &base, NULL, UIO_SYSSPACE);
  510         if (error != 0) {
  511                 error = linux_getdents_error(td, args->fd, error);
  512                 goto out;
  513         }
  514         if (td->td_retval[0] == 0)
  515                 goto out;
  516 
  517         lbuf = malloc(LINUX_RECLEN(LINUX_NAME_MAX), M_TEMP, M_WAITOK | M_ZERO);
  518 
  519         bdp = (struct dirent *) buf;
  520         linuxreclen = LINUX_RECLEN(bdp->d_namlen);
  521 
  522         linux_dirent = (struct l_dirent*)lbuf;
  523         linux_dirent->d_ino = bdp->d_fileno;
  524         linux_dirent->d_off = linuxreclen;
  525         linux_dirent->d_reclen = bdp->d_namlen;
  526         strlcpy(linux_dirent->d_name, bdp->d_name,
  527             linuxreclen - offsetof(struct l_dirent, d_name));
  528         error = copyout(linux_dirent, args->dent, linuxreclen);
  529         if (error == 0)
  530                 td->td_retval[0] = linuxreclen;
  531 
  532         free(lbuf, M_TEMP);
  533 out:
  534         free(buf, M_TEMP);
  535         return (error);
  536 }
  537 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  538 
  539 
  540 /*
  541  * These exist mainly for hooks for doing /compat/linux translation.
  542  */
  543 
  544 #ifdef LINUX_LEGACY_SYSCALLS
  545 int
  546 linux_access(struct thread *td, struct linux_access_args *args)
  547 {
  548         char *path;
  549         int error;
  550 
  551         /* Linux convention. */
  552         if (args->amode & ~(F_OK | X_OK | W_OK | R_OK))
  553                 return (EINVAL);
  554 
  555         LCONVPATHEXIST(td, args->path, &path);
  556 
  557 #ifdef DEBUG
  558         if (ldebug(access))
  559                 printf(ARGS(access, "%s, %d"), path, args->amode);
  560 #endif
  561         error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE, 0,
  562             args->amode);
  563         LFREEPATH(path);
  564 
  565         return (error);
  566 }
  567 #endif
  568 
  569 int
  570 linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
  571 {
  572         char *path;
  573         int error, dfd;
  574 
  575         /* Linux convention. */
  576         if (args->amode & ~(F_OK | X_OK | W_OK | R_OK))
  577                 return (EINVAL);
  578 
  579         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  580         LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
  581 
  582 #ifdef DEBUG
  583         if (ldebug(faccessat))
  584                 printf(ARGS(access, "%s, %d"), path, args->amode);
  585 #endif
  586 
  587         error = kern_accessat(td, dfd, path, UIO_SYSSPACE, 0, args->amode);
  588         LFREEPATH(path);
  589 
  590         return (error);
  591 }
  592 
  593 #ifdef LINUX_LEGACY_SYSCALLS
  594 int
  595 linux_unlink(struct thread *td, struct linux_unlink_args *args)
  596 {
  597         char *path;
  598         int error;
  599         struct stat st;
  600 
  601         LCONVPATHEXIST(td, args->path, &path);
  602 
  603 #ifdef DEBUG
  604         if (ldebug(unlink))
  605                 printf(ARGS(unlink, "%s"), path);
  606 #endif
  607 
  608         error = kern_unlinkat(td, AT_FDCWD, path, UIO_SYSSPACE, 0);
  609         if (error == EPERM) {
  610                 /* Introduce POSIX noncompliant behaviour of Linux */
  611                 if (kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st,
  612                     NULL) == 0) {
  613                         if (S_ISDIR(st.st_mode))
  614                                 error = EISDIR;
  615                 }
  616         }
  617         LFREEPATH(path);
  618         return (error);
  619 }
  620 #endif
  621 
  622 int
  623 linux_unlinkat(struct thread *td, struct linux_unlinkat_args *args)
  624 {
  625         char *path;
  626         int error, dfd;
  627         struct stat st;
  628 
  629         if (args->flag & ~LINUX_AT_REMOVEDIR)
  630                 return (EINVAL);
  631 
  632         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  633         LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
  634 
  635 #ifdef DEBUG
  636         if (ldebug(unlinkat))
  637                 printf(ARGS(unlinkat, "%s"), path);
  638 #endif
  639 
  640         if (args->flag & LINUX_AT_REMOVEDIR)
  641                 error = kern_rmdirat(td, dfd, path, UIO_SYSSPACE);
  642         else
  643                 error = kern_unlinkat(td, dfd, path, UIO_SYSSPACE, 0);
  644         if (error == EPERM && !(args->flag & LINUX_AT_REMOVEDIR)) {
  645                 /* Introduce POSIX noncompliant behaviour of Linux */
  646                 if (kern_statat(td, AT_SYMLINK_NOFOLLOW, dfd, path,
  647                     UIO_SYSSPACE, &st, NULL) == 0 && S_ISDIR(st.st_mode))
  648                         error = EISDIR;
  649         }
  650         LFREEPATH(path);
  651         return (error);
  652 }
  653 int
  654 linux_chdir(struct thread *td, struct linux_chdir_args *args)
  655 {
  656         char *path;
  657         int error;
  658 
  659         LCONVPATHEXIST(td, args->path, &path);
  660 
  661 #ifdef DEBUG
  662         if (ldebug(chdir))
  663                 printf(ARGS(chdir, "%s"), path);
  664 #endif
  665         error = kern_chdir(td, path, UIO_SYSSPACE);
  666         LFREEPATH(path);
  667         return (error);
  668 }
  669 
  670 #ifdef LINUX_LEGACY_SYSCALLS
  671 int
  672 linux_chmod(struct thread *td, struct linux_chmod_args *args)
  673 {
  674         char *path;
  675         int error;
  676 
  677         LCONVPATHEXIST(td, args->path, &path);
  678 
  679 #ifdef DEBUG
  680         if (ldebug(chmod))
  681                 printf(ARGS(chmod, "%s, %d"), path, args->mode);
  682 #endif
  683         error = kern_fchmodat(td, AT_FDCWD, path, UIO_SYSSPACE,
  684             args->mode, 0);
  685         LFREEPATH(path);
  686         return (error);
  687 }
  688 #endif
  689 
  690 int
  691 linux_fchmodat(struct thread *td, struct linux_fchmodat_args *args)
  692 {
  693         char *path;
  694         int error, dfd;
  695 
  696         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  697         LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
  698 
  699 #ifdef DEBUG
  700         if (ldebug(fchmodat))
  701                 printf(ARGS(fchmodat, "%s, %d"), path, args->mode);
  702 #endif
  703 
  704         error = kern_fchmodat(td, dfd, path, UIO_SYSSPACE, args->mode, 0);
  705         LFREEPATH(path);
  706         return (error);
  707 }
  708 
  709 #ifdef LINUX_LEGACY_SYSCALLS
  710 int
  711 linux_mkdir(struct thread *td, struct linux_mkdir_args *args)
  712 {
  713         char *path;
  714         int error;
  715 
  716         LCONVPATHCREAT(td, args->path, &path);
  717 
  718 #ifdef DEBUG
  719         if (ldebug(mkdir))
  720                 printf(ARGS(mkdir, "%s, %d"), path, args->mode);
  721 #endif
  722         error = kern_mkdirat(td, AT_FDCWD, path, UIO_SYSSPACE, args->mode);
  723         LFREEPATH(path);
  724         return (error);
  725 }
  726 #endif
  727 
  728 int
  729 linux_mkdirat(struct thread *td, struct linux_mkdirat_args *args)
  730 {
  731         char *path;
  732         int error, dfd;
  733 
  734         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  735         LCONVPATHCREAT_AT(td, args->pathname, &path, dfd);
  736 
  737 #ifdef DEBUG
  738         if (ldebug(mkdirat))
  739                 printf(ARGS(mkdirat, "%s, %d"), path, args->mode);
  740 #endif
  741         error = kern_mkdirat(td, dfd, path, UIO_SYSSPACE, args->mode);
  742         LFREEPATH(path);
  743         return (error);
  744 }
  745 
  746 #ifdef LINUX_LEGACY_SYSCALLS
  747 int
  748 linux_rmdir(struct thread *td, struct linux_rmdir_args *args)
  749 {
  750         char *path;
  751         int error;
  752 
  753         LCONVPATHEXIST(td, args->path, &path);
  754 
  755 #ifdef DEBUG
  756         if (ldebug(rmdir))
  757                 printf(ARGS(rmdir, "%s"), path);
  758 #endif
  759         error = kern_rmdirat(td, AT_FDCWD, path, UIO_SYSSPACE);
  760         LFREEPATH(path);
  761         return (error);
  762 }
  763 
  764 int
  765 linux_rename(struct thread *td, struct linux_rename_args *args)
  766 {
  767         char *from, *to;
  768         int error;
  769 
  770         LCONVPATHEXIST(td, args->from, &from);
  771         /* Expand LCONVPATHCREATE so that `from' can be freed on errors */
  772         error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
  773         if (to == NULL) {
  774                 LFREEPATH(from);
  775                 return (error);
  776         }
  777 
  778 #ifdef DEBUG
  779         if (ldebug(rename))
  780                 printf(ARGS(rename, "%s, %s"), from, to);
  781 #endif
  782         error = kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, UIO_SYSSPACE);
  783         LFREEPATH(from);
  784         LFREEPATH(to);
  785         return (error);
  786 }
  787 #endif
  788 
  789 int
  790 linux_renameat(struct thread *td, struct linux_renameat_args *args)
  791 {
  792         char *from, *to;
  793         int error, olddfd, newdfd;
  794 
  795         olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
  796         newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
  797         LCONVPATHEXIST_AT(td, args->oldname, &from, olddfd);
  798         /* Expand LCONVPATHCREATE so that `from' can be freed on errors */
  799         error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, newdfd);
  800         if (to == NULL) {
  801                 LFREEPATH(from);
  802                 return (error);
  803         }
  804 
  805 #ifdef DEBUG
  806         if (ldebug(renameat))
  807                 printf(ARGS(renameat, "%s, %s"), from, to);
  808 #endif
  809         error = kern_renameat(td, olddfd, from, newdfd, to, UIO_SYSSPACE);
  810         LFREEPATH(from);
  811         LFREEPATH(to);
  812         return (error);
  813 }
  814 
  815 #ifdef LINUX_LEGACY_SYSCALLS
  816 int
  817 linux_symlink(struct thread *td, struct linux_symlink_args *args)
  818 {
  819         char *path, *to;
  820         int error;
  821 
  822         LCONVPATHEXIST(td, args->path, &path);
  823         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
  824         error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
  825         if (to == NULL) {
  826                 LFREEPATH(path);
  827                 return (error);
  828         }
  829 
  830 #ifdef DEBUG
  831         if (ldebug(symlink))
  832                 printf(ARGS(symlink, "%s, %s"), path, to);
  833 #endif
  834         error = kern_symlinkat(td, path, AT_FDCWD, to, UIO_SYSSPACE);
  835         LFREEPATH(path);
  836         LFREEPATH(to);
  837         return (error);
  838 }
  839 #endif
  840 
  841 int
  842 linux_symlinkat(struct thread *td, struct linux_symlinkat_args *args)
  843 {
  844         char *path, *to;
  845         int error, dfd;
  846 
  847         dfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
  848         LCONVPATHEXIST(td, args->oldname, &path);
  849         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
  850         error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, dfd);
  851         if (to == NULL) {
  852                 LFREEPATH(path);
  853                 return (error);
  854         }
  855 
  856 #ifdef DEBUG
  857         if (ldebug(symlinkat))
  858                 printf(ARGS(symlinkat, "%s, %s"), path, to);
  859 #endif
  860 
  861         error = kern_symlinkat(td, path, dfd, to, UIO_SYSSPACE);
  862         LFREEPATH(path);
  863         LFREEPATH(to);
  864         return (error);
  865 }
  866 
  867 #ifdef LINUX_LEGACY_SYSCALLS
  868 int
  869 linux_readlink(struct thread *td, struct linux_readlink_args *args)
  870 {
  871         char *name;
  872         int error;
  873 
  874         LCONVPATHEXIST(td, args->name, &name);
  875 
  876 #ifdef DEBUG
  877         if (ldebug(readlink))
  878                 printf(ARGS(readlink, "%s, %p, %d"), name, (void *)args->buf,
  879                     args->count);
  880 #endif
  881         error = kern_readlinkat(td, AT_FDCWD, name, UIO_SYSSPACE,
  882             args->buf, UIO_USERSPACE, args->count);
  883         LFREEPATH(name);
  884         return (error);
  885 }
  886 #endif
  887 
  888 int
  889 linux_readlinkat(struct thread *td, struct linux_readlinkat_args *args)
  890 {
  891         char *name;
  892         int error, dfd;
  893 
  894         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  895         LCONVPATHEXIST_AT(td, args->path, &name, dfd);
  896 
  897 #ifdef DEBUG
  898         if (ldebug(readlinkat))
  899                 printf(ARGS(readlinkat, "%s, %p, %d"), name, (void *)args->buf,
  900                     args->bufsiz);
  901 #endif
  902 
  903         error = kern_readlinkat(td, dfd, name, UIO_SYSSPACE, args->buf,
  904             UIO_USERSPACE, args->bufsiz);
  905         LFREEPATH(name);
  906         return (error);
  907 }
  908 
  909 int
  910 linux_truncate(struct thread *td, struct linux_truncate_args *args)
  911 {
  912         char *path;
  913         int error;
  914 
  915         LCONVPATHEXIST(td, args->path, &path);
  916 
  917 #ifdef DEBUG
  918         if (ldebug(truncate))
  919                 printf(ARGS(truncate, "%s, %ld"), path, (long)args->length);
  920 #endif
  921 
  922         error = kern_truncate(td, path, UIO_SYSSPACE, args->length);
  923         LFREEPATH(path);
  924         return (error);
  925 }
  926 
  927 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  928 int
  929 linux_truncate64(struct thread *td, struct linux_truncate64_args *args)
  930 {
  931         char *path;
  932         int error;
  933 
  934         LCONVPATHEXIST(td, args->path, &path);
  935 
  936 #ifdef DEBUG
  937         if (ldebug(truncate64))
  938                 printf(ARGS(truncate64, "%s, %jd"), path, args->length);
  939 #endif
  940 
  941         error = kern_truncate(td, path, UIO_SYSSPACE, args->length);
  942         LFREEPATH(path);
  943         return (error);
  944 }
  945 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  946 
  947 int
  948 linux_ftruncate(struct thread *td, struct linux_ftruncate_args *args)
  949 {
  950 
  951         return (kern_ftruncate(td, args->fd, args->length));
  952 }
  953 
  954 #ifdef LINUX_LEGACY_SYSCALLS
  955 int
  956 linux_link(struct thread *td, struct linux_link_args *args)
  957 {
  958         char *path, *to;
  959         int error;
  960 
  961         LCONVPATHEXIST(td, args->path, &path);
  962         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
  963         error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
  964         if (to == NULL) {
  965                 LFREEPATH(path);
  966                 return (error);
  967         }
  968 
  969 #ifdef DEBUG
  970         if (ldebug(link))
  971                 printf(ARGS(link, "%s, %s"), path, to);
  972 #endif
  973         error = kern_linkat(td, AT_FDCWD, AT_FDCWD, path, to, UIO_SYSSPACE,
  974             FOLLOW);
  975         LFREEPATH(path);
  976         LFREEPATH(to);
  977         return (error);
  978 }
  979 #endif
  980 
  981 int
  982 linux_linkat(struct thread *td, struct linux_linkat_args *args)
  983 {
  984         char *path, *to;
  985         int error, olddfd, newdfd, follow;
  986 
  987         if (args->flag & ~LINUX_AT_SYMLINK_FOLLOW)
  988                 return (EINVAL);
  989 
  990         olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
  991         newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
  992         LCONVPATHEXIST_AT(td, args->oldname, &path, olddfd);
  993         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
  994         error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, newdfd);
  995         if (to == NULL) {
  996                 LFREEPATH(path);
  997                 return (error);
  998         }
  999 
 1000 #ifdef DEBUG
 1001         if (ldebug(linkat))
 1002                 printf(ARGS(linkat, "%i, %s, %i, %s, %i"), args->olddfd, path,
 1003                         args->newdfd, to, args->flag);
 1004 #endif
 1005 
 1006         follow = (args->flag & LINUX_AT_SYMLINK_FOLLOW) == 0 ? NOFOLLOW :
 1007             FOLLOW;
 1008         error = kern_linkat(td, olddfd, newdfd, path, to, UIO_SYSSPACE, follow);
 1009         LFREEPATH(path);
 1010         LFREEPATH(to);
 1011         return (error);
 1012 }
 1013 
 1014 int
 1015 linux_fdatasync(td, uap)
 1016         struct thread *td;
 1017         struct linux_fdatasync_args *uap;
 1018 {
 1019 
 1020         return (kern_fsync(td, uap->fd, false));
 1021 }
 1022 
 1023 int
 1024 linux_pread(struct thread *td, struct linux_pread_args *uap)
 1025 {
 1026         cap_rights_t rights;
 1027         struct vnode *vp;
 1028         int error;
 1029 
 1030         error = kern_pread(td, uap->fd, uap->buf, uap->nbyte, uap->offset);
 1031         if (error == 0) {
 1032                 /* This seems to violate POSIX but Linux does it. */
 1033                 error = fgetvp(td, uap->fd,
 1034                     cap_rights_init(&rights, CAP_PREAD), &vp);
 1035                 if (error != 0)
 1036                         return (error);
 1037                 if (vp->v_type == VDIR) {
 1038                         vrele(vp);
 1039                         return (EISDIR);
 1040                 }
 1041                 vrele(vp);
 1042         }
 1043         return (error);
 1044 }
 1045 
 1046 int
 1047 linux_pwrite(struct thread *td, struct linux_pwrite_args *uap)
 1048 {
 1049 
 1050         return (kern_pwrite(td, uap->fd, uap->buf, uap->nbyte, uap->offset));
 1051 }
 1052 
 1053 int
 1054 linux_preadv(struct thread *td, struct linux_preadv_args *uap)
 1055 {
 1056         struct uio *auio;
 1057         int error;
 1058         off_t offset;
 1059 
 1060         /*
 1061          * According http://man7.org/linux/man-pages/man2/preadv.2.html#NOTES
 1062          * pos_l and pos_h, respectively, contain the
 1063          * low order and high order 32 bits of offset.
 1064          */
 1065         offset = (((off_t)uap->pos_h << (sizeof(offset) * 4)) <<
 1066             (sizeof(offset) * 4)) | uap->pos_l;
 1067         if (offset < 0)
 1068                 return (EINVAL);
 1069 #ifdef COMPAT_LINUX32
 1070         error = linux32_copyinuio(PTRIN(uap->vec), uap->vlen, &auio);
 1071 #else
 1072         error = copyinuio(uap->vec, uap->vlen, &auio);
 1073 #endif
 1074         if (error != 0)
 1075                 return (error);
 1076         error = kern_preadv(td, uap->fd, auio, offset);
 1077         free(auio, M_IOV);
 1078         return (error);
 1079 }
 1080 
 1081 int
 1082 linux_pwritev(struct thread *td, struct linux_pwritev_args *uap)
 1083 {
 1084         struct uio *auio;
 1085         int error;
 1086         off_t offset;
 1087 
 1088         /*
 1089          * According http://man7.org/linux/man-pages/man2/pwritev.2.html#NOTES
 1090          * pos_l and pos_h, respectively, contain the
 1091          * low order and high order 32 bits of offset.
 1092          */
 1093         offset = (((off_t)uap->pos_h << (sizeof(offset) * 4)) <<
 1094             (sizeof(offset) * 4)) | uap->pos_l;
 1095         if (offset < 0)
 1096                 return (EINVAL);
 1097 #ifdef COMPAT_LINUX32
 1098         error = linux32_copyinuio(PTRIN(uap->vec), uap->vlen, &auio);
 1099 #else
 1100         error = copyinuio(uap->vec, uap->vlen, &auio);
 1101 #endif
 1102         if (error != 0)
 1103                 return (error);
 1104         error = kern_pwritev(td, uap->fd, auio, offset);
 1105         free(auio, M_IOV);
 1106         return (error);
 1107 }
 1108 
 1109 int
 1110 linux_mount(struct thread *td, struct linux_mount_args *args)
 1111 {
 1112         char fstypename[MFSNAMELEN];
 1113         char mntonname[MNAMELEN], mntfromname[MNAMELEN];
 1114         int error;
 1115         int fsflags;
 1116 
 1117         error = copyinstr(args->filesystemtype, fstypename, MFSNAMELEN - 1,
 1118             NULL);
 1119         if (error)
 1120                 return (error);
 1121         error = copyinstr(args->specialfile, mntfromname, MNAMELEN - 1, NULL);
 1122         if (error)
 1123                 return (error);
 1124         error = copyinstr(args->dir, mntonname, MNAMELEN - 1, NULL);
 1125         if (error)
 1126                 return (error);
 1127 
 1128 #ifdef DEBUG
 1129         if (ldebug(mount))
 1130                 printf(ARGS(mount, "%s, %s, %s"),
 1131                     fstypename, mntfromname, mntonname);
 1132 #endif
 1133 
 1134         if (strcmp(fstypename, "ext2") == 0) {
 1135                 strcpy(fstypename, "ext2fs");
 1136         } else if (strcmp(fstypename, "proc") == 0) {
 1137                 strcpy(fstypename, "linprocfs");
 1138         } else if (strcmp(fstypename, "vfat") == 0) {
 1139                 strcpy(fstypename, "msdosfs");
 1140         }
 1141 
 1142         fsflags = 0;
 1143 
 1144         if ((args->rwflag & 0xffff0000) == 0xc0ed0000) {
 1145                 /*
 1146                  * Linux SYNC flag is not included; the closest equivalent
 1147                  * FreeBSD has is !ASYNC, which is our default.
 1148                  */
 1149                 if (args->rwflag & LINUX_MS_RDONLY)
 1150                         fsflags |= MNT_RDONLY;
 1151                 if (args->rwflag & LINUX_MS_NOSUID)
 1152                         fsflags |= MNT_NOSUID;
 1153                 if (args->rwflag & LINUX_MS_NOEXEC)
 1154                         fsflags |= MNT_NOEXEC;
 1155                 if (args->rwflag & LINUX_MS_REMOUNT)
 1156                         fsflags |= MNT_UPDATE;
 1157         }
 1158 
 1159         error = kernel_vmount(fsflags,
 1160             "fstype", fstypename,
 1161             "fspath", mntonname,
 1162             "from", mntfromname,
 1163             NULL);
 1164         return (error);
 1165 }
 1166 
 1167 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1168 int
 1169 linux_oldumount(struct thread *td, struct linux_oldumount_args *args)
 1170 {
 1171         struct linux_umount_args args2;
 1172 
 1173         args2.path = args->path;
 1174         args2.flags = 0;
 1175         return (linux_umount(td, &args2));
 1176 }
 1177 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1178 
 1179 #ifdef LINUX_LEGACY_SYSCALLS
 1180 int
 1181 linux_umount(struct thread *td, struct linux_umount_args *args)
 1182 {
 1183         struct unmount_args bsd;
 1184 
 1185         bsd.path = args->path;
 1186         bsd.flags = args->flags;        /* XXX correct? */
 1187         return (sys_unmount(td, &bsd));
 1188 }
 1189 #endif
 1190 
 1191 /*
 1192  * fcntl family of syscalls
 1193  */
 1194 
 1195 struct l_flock {
 1196         l_short         l_type;
 1197         l_short         l_whence;
 1198         l_off_t         l_start;
 1199         l_off_t         l_len;
 1200         l_pid_t         l_pid;
 1201 }
 1202 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 1203 __packed
 1204 #endif
 1205 ;
 1206 
 1207 static void
 1208 linux_to_bsd_flock(struct l_flock *linux_flock, struct flock *bsd_flock)
 1209 {
 1210         switch (linux_flock->l_type) {
 1211         case LINUX_F_RDLCK:
 1212                 bsd_flock->l_type = F_RDLCK;
 1213                 break;
 1214         case LINUX_F_WRLCK:
 1215                 bsd_flock->l_type = F_WRLCK;
 1216                 break;
 1217         case LINUX_F_UNLCK:
 1218                 bsd_flock->l_type = F_UNLCK;
 1219                 break;
 1220         default:
 1221                 bsd_flock->l_type = -1;
 1222                 break;
 1223         }
 1224         bsd_flock->l_whence = linux_flock->l_whence;
 1225         bsd_flock->l_start = (off_t)linux_flock->l_start;
 1226         bsd_flock->l_len = (off_t)linux_flock->l_len;
 1227         bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
 1228         bsd_flock->l_sysid = 0;
 1229 }
 1230 
 1231 static void
 1232 bsd_to_linux_flock(struct flock *bsd_flock, struct l_flock *linux_flock)
 1233 {
 1234         switch (bsd_flock->l_type) {
 1235         case F_RDLCK:
 1236                 linux_flock->l_type = LINUX_F_RDLCK;
 1237                 break;
 1238         case F_WRLCK:
 1239                 linux_flock->l_type = LINUX_F_WRLCK;
 1240                 break;
 1241         case F_UNLCK:
 1242                 linux_flock->l_type = LINUX_F_UNLCK;
 1243                 break;
 1244         }
 1245         linux_flock->l_whence = bsd_flock->l_whence;
 1246         linux_flock->l_start = (l_off_t)bsd_flock->l_start;
 1247         linux_flock->l_len = (l_off_t)bsd_flock->l_len;
 1248         linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
 1249 }
 1250 
 1251 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1252 struct l_flock64 {
 1253         l_short         l_type;
 1254         l_short         l_whence;
 1255         l_loff_t        l_start;
 1256         l_loff_t        l_len;
 1257         l_pid_t         l_pid;
 1258 }
 1259 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 1260 __packed
 1261 #endif
 1262 ;
 1263 
 1264 static void
 1265 linux_to_bsd_flock64(struct l_flock64 *linux_flock, struct flock *bsd_flock)
 1266 {
 1267         switch (linux_flock->l_type) {
 1268         case LINUX_F_RDLCK:
 1269                 bsd_flock->l_type = F_RDLCK;
 1270                 break;
 1271         case LINUX_F_WRLCK:
 1272                 bsd_flock->l_type = F_WRLCK;
 1273                 break;
 1274         case LINUX_F_UNLCK:
 1275                 bsd_flock->l_type = F_UNLCK;
 1276                 break;
 1277         default:
 1278                 bsd_flock->l_type = -1;
 1279                 break;
 1280         }
 1281         bsd_flock->l_whence = linux_flock->l_whence;
 1282         bsd_flock->l_start = (off_t)linux_flock->l_start;
 1283         bsd_flock->l_len = (off_t)linux_flock->l_len;
 1284         bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
 1285         bsd_flock->l_sysid = 0;
 1286 }
 1287 
 1288 static void
 1289 bsd_to_linux_flock64(struct flock *bsd_flock, struct l_flock64 *linux_flock)
 1290 {
 1291         switch (bsd_flock->l_type) {
 1292         case F_RDLCK:
 1293                 linux_flock->l_type = LINUX_F_RDLCK;
 1294                 break;
 1295         case F_WRLCK:
 1296                 linux_flock->l_type = LINUX_F_WRLCK;
 1297                 break;
 1298         case F_UNLCK:
 1299                 linux_flock->l_type = LINUX_F_UNLCK;
 1300                 break;
 1301         }
 1302         linux_flock->l_whence = bsd_flock->l_whence;
 1303         linux_flock->l_start = (l_loff_t)bsd_flock->l_start;
 1304         linux_flock->l_len = (l_loff_t)bsd_flock->l_len;
 1305         linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
 1306 }
 1307 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1308 
 1309 static int
 1310 fcntl_common(struct thread *td, struct linux_fcntl_args *args)
 1311 {
 1312         struct l_flock linux_flock;
 1313         struct flock bsd_flock;
 1314         cap_rights_t rights;
 1315         struct file *fp;
 1316         long arg;
 1317         int error, result;
 1318 
 1319         switch (args->cmd) {
 1320         case LINUX_F_DUPFD:
 1321                 return (kern_fcntl(td, args->fd, F_DUPFD, args->arg));
 1322 
 1323         case LINUX_F_GETFD:
 1324                 return (kern_fcntl(td, args->fd, F_GETFD, 0));
 1325 
 1326         case LINUX_F_SETFD:
 1327                 return (kern_fcntl(td, args->fd, F_SETFD, args->arg));
 1328 
 1329         case LINUX_F_GETFL:
 1330                 error = kern_fcntl(td, args->fd, F_GETFL, 0);
 1331                 result = td->td_retval[0];
 1332                 td->td_retval[0] = 0;
 1333                 if (result & O_RDONLY)
 1334                         td->td_retval[0] |= LINUX_O_RDONLY;
 1335                 if (result & O_WRONLY)
 1336                         td->td_retval[0] |= LINUX_O_WRONLY;
 1337                 if (result & O_RDWR)
 1338                         td->td_retval[0] |= LINUX_O_RDWR;
 1339                 if (result & O_NDELAY)
 1340                         td->td_retval[0] |= LINUX_O_NONBLOCK;
 1341                 if (result & O_APPEND)
 1342                         td->td_retval[0] |= LINUX_O_APPEND;
 1343                 if (result & O_FSYNC)
 1344                         td->td_retval[0] |= LINUX_O_SYNC;
 1345                 if (result & O_ASYNC)
 1346                         td->td_retval[0] |= LINUX_FASYNC;
 1347 #ifdef LINUX_O_NOFOLLOW
 1348                 if (result & O_NOFOLLOW)
 1349                         td->td_retval[0] |= LINUX_O_NOFOLLOW;
 1350 #endif
 1351 #ifdef LINUX_O_DIRECT
 1352                 if (result & O_DIRECT)
 1353                         td->td_retval[0] |= LINUX_O_DIRECT;
 1354 #endif
 1355                 return (error);
 1356 
 1357         case LINUX_F_SETFL:
 1358                 arg = 0;
 1359                 if (args->arg & LINUX_O_NDELAY)
 1360                         arg |= O_NONBLOCK;
 1361                 if (args->arg & LINUX_O_APPEND)
 1362                         arg |= O_APPEND;
 1363                 if (args->arg & LINUX_O_SYNC)
 1364                         arg |= O_FSYNC;
 1365                 if (args->arg & LINUX_FASYNC)
 1366                         arg |= O_ASYNC;
 1367 #ifdef LINUX_O_NOFOLLOW
 1368                 if (args->arg & LINUX_O_NOFOLLOW)
 1369                         arg |= O_NOFOLLOW;
 1370 #endif
 1371 #ifdef LINUX_O_DIRECT
 1372                 if (args->arg & LINUX_O_DIRECT)
 1373                         arg |= O_DIRECT;
 1374 #endif
 1375                 return (kern_fcntl(td, args->fd, F_SETFL, arg));
 1376 
 1377         case LINUX_F_GETLK:
 1378                 error = copyin((void *)args->arg, &linux_flock,
 1379                     sizeof(linux_flock));
 1380                 if (error)
 1381                         return (error);
 1382                 linux_to_bsd_flock(&linux_flock, &bsd_flock);
 1383                 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
 1384                 if (error)
 1385                         return (error);
 1386                 bsd_to_linux_flock(&bsd_flock, &linux_flock);
 1387                 return (copyout(&linux_flock, (void *)args->arg,
 1388                     sizeof(linux_flock)));
 1389 
 1390         case LINUX_F_SETLK:
 1391                 error = copyin((void *)args->arg, &linux_flock,
 1392                     sizeof(linux_flock));
 1393                 if (error)
 1394                         return (error);
 1395                 linux_to_bsd_flock(&linux_flock, &bsd_flock);
 1396                 return (kern_fcntl(td, args->fd, F_SETLK,
 1397                     (intptr_t)&bsd_flock));
 1398 
 1399         case LINUX_F_SETLKW:
 1400                 error = copyin((void *)args->arg, &linux_flock,
 1401                     sizeof(linux_flock));
 1402                 if (error)
 1403                         return (error);
 1404                 linux_to_bsd_flock(&linux_flock, &bsd_flock);
 1405                 return (kern_fcntl(td, args->fd, F_SETLKW,
 1406                      (intptr_t)&bsd_flock));
 1407 
 1408         case LINUX_F_GETOWN:
 1409                 return (kern_fcntl(td, args->fd, F_GETOWN, 0));
 1410 
 1411         case LINUX_F_SETOWN:
 1412                 /*
 1413                  * XXX some Linux applications depend on F_SETOWN having no
 1414                  * significant effect for pipes (SIGIO is not delivered for
 1415                  * pipes under Linux-2.2.35 at least).
 1416                  */
 1417                 error = fget(td, args->fd,
 1418                     cap_rights_init(&rights, CAP_FCNTL), &fp);
 1419                 if (error)
 1420                         return (error);
 1421                 if (fp->f_type == DTYPE_PIPE) {
 1422                         fdrop(fp, td);
 1423                         return (EINVAL);
 1424                 }
 1425                 fdrop(fp, td);
 1426 
 1427                 return (kern_fcntl(td, args->fd, F_SETOWN, args->arg));
 1428 
 1429         case LINUX_F_DUPFD_CLOEXEC:
 1430                 return (kern_fcntl(td, args->fd, F_DUPFD_CLOEXEC, args->arg));
 1431         }
 1432 
 1433         return (EINVAL);
 1434 }
 1435 
 1436 int
 1437 linux_fcntl(struct thread *td, struct linux_fcntl_args *args)
 1438 {
 1439 
 1440 #ifdef DEBUG
 1441         if (ldebug(fcntl))
 1442                 printf(ARGS(fcntl, "%d, %08x, *"), args->fd, args->cmd);
 1443 #endif
 1444 
 1445         return (fcntl_common(td, args));
 1446 }
 1447 
 1448 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1449 int
 1450 linux_fcntl64(struct thread *td, struct linux_fcntl64_args *args)
 1451 {
 1452         struct l_flock64 linux_flock;
 1453         struct flock bsd_flock;
 1454         struct linux_fcntl_args fcntl_args;
 1455         int error;
 1456 
 1457 #ifdef DEBUG
 1458         if (ldebug(fcntl64))
 1459                 printf(ARGS(fcntl64, "%d, %08x, *"), args->fd, args->cmd);
 1460 #endif
 1461 
 1462         switch (args->cmd) {
 1463         case LINUX_F_GETLK64:
 1464                 error = copyin((void *)args->arg, &linux_flock,
 1465                     sizeof(linux_flock));
 1466                 if (error)
 1467                         return (error);
 1468                 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
 1469                 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
 1470                 if (error)
 1471                         return (error);
 1472                 bsd_to_linux_flock64(&bsd_flock, &linux_flock);
 1473                 return (copyout(&linux_flock, (void *)args->arg,
 1474                             sizeof(linux_flock)));
 1475 
 1476         case LINUX_F_SETLK64:
 1477                 error = copyin((void *)args->arg, &linux_flock,
 1478                     sizeof(linux_flock));
 1479                 if (error)
 1480                         return (error);
 1481                 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
 1482                 return (kern_fcntl(td, args->fd, F_SETLK,
 1483                     (intptr_t)&bsd_flock));
 1484 
 1485         case LINUX_F_SETLKW64:
 1486                 error = copyin((void *)args->arg, &linux_flock,
 1487                     sizeof(linux_flock));
 1488                 if (error)
 1489                         return (error);
 1490                 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
 1491                 return (kern_fcntl(td, args->fd, F_SETLKW,
 1492                     (intptr_t)&bsd_flock));
 1493         }
 1494 
 1495         fcntl_args.fd = args->fd;
 1496         fcntl_args.cmd = args->cmd;
 1497         fcntl_args.arg = args->arg;
 1498         return (fcntl_common(td, &fcntl_args));
 1499 }
 1500 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1501 
 1502 #ifdef LINUX_LEGACY_SYSCALLS
 1503 int
 1504 linux_chown(struct thread *td, struct linux_chown_args *args)
 1505 {
 1506         char *path;
 1507         int error;
 1508 
 1509         LCONVPATHEXIST(td, args->path, &path);
 1510 
 1511 #ifdef DEBUG
 1512         if (ldebug(chown))
 1513                 printf(ARGS(chown, "%s, %d, %d"), path, args->uid, args->gid);
 1514 #endif
 1515         error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, args->uid,
 1516             args->gid, 0);
 1517         LFREEPATH(path);
 1518         return (error);
 1519 }
 1520 #endif
 1521 
 1522 int
 1523 linux_fchownat(struct thread *td, struct linux_fchownat_args *args)
 1524 {
 1525         char *path;
 1526         int error, dfd, flag;
 1527 
 1528         if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
 1529                 return (EINVAL);
 1530 
 1531         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD :  args->dfd;
 1532         LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
 1533 
 1534 #ifdef DEBUG
 1535         if (ldebug(fchownat))
 1536                 printf(ARGS(fchownat, "%s, %d, %d"), path, args->uid, args->gid);
 1537 #endif
 1538 
 1539         flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) == 0 ? 0 :
 1540             AT_SYMLINK_NOFOLLOW;
 1541         error = kern_fchownat(td, dfd, path, UIO_SYSSPACE, args->uid, args->gid,
 1542             flag);
 1543         LFREEPATH(path);
 1544         return (error);
 1545 }
 1546 
 1547 #ifdef LINUX_LEGACY_SYSCALLS
 1548 int
 1549 linux_lchown(struct thread *td, struct linux_lchown_args *args)
 1550 {
 1551         char *path;
 1552         int error;
 1553 
 1554         LCONVPATHEXIST(td, args->path, &path);
 1555 
 1556 #ifdef DEBUG
 1557         if (ldebug(lchown))
 1558                 printf(ARGS(lchown, "%s, %d, %d"), path, args->uid, args->gid);
 1559 #endif
 1560         error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, args->uid,
 1561             args->gid, AT_SYMLINK_NOFOLLOW);
 1562         LFREEPATH(path);
 1563         return (error);
 1564 }
 1565 #endif
 1566 
 1567 static int
 1568 convert_fadvice(int advice)
 1569 {
 1570         switch (advice) {
 1571         case LINUX_POSIX_FADV_NORMAL:
 1572                 return (POSIX_FADV_NORMAL);
 1573         case LINUX_POSIX_FADV_RANDOM:
 1574                 return (POSIX_FADV_RANDOM);
 1575         case LINUX_POSIX_FADV_SEQUENTIAL:
 1576                 return (POSIX_FADV_SEQUENTIAL);
 1577         case LINUX_POSIX_FADV_WILLNEED:
 1578                 return (POSIX_FADV_WILLNEED);
 1579         case LINUX_POSIX_FADV_DONTNEED:
 1580                 return (POSIX_FADV_DONTNEED);
 1581         case LINUX_POSIX_FADV_NOREUSE:
 1582                 return (POSIX_FADV_NOREUSE);
 1583         default:
 1584                 return (-1);
 1585         }
 1586 }
 1587 
 1588 int
 1589 linux_fadvise64(struct thread *td, struct linux_fadvise64_args *args)
 1590 {
 1591         int advice;
 1592 
 1593         advice = convert_fadvice(args->advice);
 1594         if (advice == -1)
 1595                 return (EINVAL);
 1596         return (kern_posix_fadvise(td, args->fd, args->offset, args->len,
 1597             advice));
 1598 }
 1599 
 1600 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1601 int
 1602 linux_fadvise64_64(struct thread *td, struct linux_fadvise64_64_args *args)
 1603 {
 1604         int advice;
 1605 
 1606         advice = convert_fadvice(args->advice);
 1607         if (advice == -1)
 1608                 return (EINVAL);
 1609         return (kern_posix_fadvise(td, args->fd, args->offset, args->len,
 1610             advice));
 1611 }
 1612 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1613 
 1614 #ifdef LINUX_LEGACY_SYSCALLS
 1615 int
 1616 linux_pipe(struct thread *td, struct linux_pipe_args *args)
 1617 {
 1618         int fildes[2];
 1619         int error;
 1620 
 1621 #ifdef DEBUG
 1622         if (ldebug(pipe))
 1623                 printf(ARGS(pipe, "*"));
 1624 #endif
 1625 
 1626         error = kern_pipe(td, fildes, 0, NULL, NULL);
 1627         if (error != 0)
 1628                 return (error);
 1629 
 1630         error = copyout(fildes, args->pipefds, sizeof(fildes));
 1631         if (error != 0) {
 1632                 (void)kern_close(td, fildes[0]);
 1633                 (void)kern_close(td, fildes[1]);
 1634         }
 1635 
 1636         return (error);
 1637 }
 1638 #endif
 1639 
 1640 int
 1641 linux_pipe2(struct thread *td, struct linux_pipe2_args *args)
 1642 {
 1643         int fildes[2];
 1644         int error, flags;
 1645 
 1646 #ifdef DEBUG
 1647         if (ldebug(pipe2))
 1648                 printf(ARGS(pipe2, "*, %d"), args->flags);
 1649 #endif
 1650 
 1651         if ((args->flags & ~(LINUX_O_NONBLOCK | LINUX_O_CLOEXEC)) != 0)
 1652                 return (EINVAL);
 1653 
 1654         flags = 0;
 1655         if ((args->flags & LINUX_O_NONBLOCK) != 0)
 1656                 flags |= O_NONBLOCK;
 1657         if ((args->flags & LINUX_O_CLOEXEC) != 0)
 1658                 flags |= O_CLOEXEC;
 1659         error = kern_pipe(td, fildes, flags, NULL, NULL);
 1660         if (error != 0)
 1661                 return (error);
 1662 
 1663         error = copyout(fildes, args->pipefds, sizeof(fildes));
 1664         if (error != 0) {
 1665                 (void)kern_close(td, fildes[0]);
 1666                 (void)kern_close(td, fildes[1]);
 1667         }
 1668 
 1669         return (error);
 1670 }
 1671 
 1672 int
 1673 linux_dup3(struct thread *td, struct linux_dup3_args *args)
 1674 {
 1675         int cmd;
 1676         intptr_t newfd;
 1677 
 1678         if (args->oldfd == args->newfd)
 1679                 return (EINVAL);
 1680         if ((args->flags & ~LINUX_O_CLOEXEC) != 0)
 1681                 return (EINVAL);
 1682         if (args->flags & LINUX_O_CLOEXEC)
 1683                 cmd = F_DUP2FD_CLOEXEC;
 1684         else
 1685                 cmd = F_DUP2FD;
 1686 
 1687         newfd = args->newfd;
 1688         return (kern_fcntl(td, args->oldfd, cmd, newfd));
 1689 }
 1690 
 1691 int
 1692 linux_fallocate(struct thread *td, struct linux_fallocate_args *args)
 1693 {
 1694 
 1695         /*
 1696          * We emulate only posix_fallocate system call for which
 1697          * mode should be 0.
 1698          */
 1699         if (args->mode != 0)
 1700                 return (ENOSYS);
 1701 
 1702         return (kern_posix_fallocate(td, args->fd, args->offset,
 1703             args->len));
 1704 }

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