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

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/9.2/sys/kern/subr_uio.c 251874 2013-06-18 00:36:53Z scottl $");
   39 
   40 #include "opt_zero.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/limits.h>
   46 #include <sys/lock.h>
   47 #include <sys/mman.h>
   48 #include <sys/mutex.h>
   49 #include <sys/proc.h>
   50 #include <sys/resourcevar.h>
   51 #include <sys/sched.h>
   52 #include <sys/sysctl.h>
   53 #include <sys/vnode.h>
   54 
   55 #include <vm/vm.h>
   56 #include <vm/vm_param.h>
   57 #include <vm/vm_extern.h>
   58 #include <vm/vm_page.h>
   59 #include <vm/vm_map.h>
   60 #ifdef ZERO_COPY_SOCKETS
   61 #include <vm/vm_object.h>
   62 #endif
   63 
   64 SYSCTL_INT(_kern, KERN_IOV_MAX, iov_max, CTLFLAG_RD, NULL, UIO_MAXIOV,
   65         "Maximum number of elements in an I/O vector; sysconf(_SC_IOV_MAX)");
   66 
   67 static int uiomove_faultflag(void *cp, int n, struct uio *uio, int nofault);
   68 
   69 #ifdef ZERO_COPY_SOCKETS
   70 /* Declared in uipc_socket.c */
   71 extern int so_zero_copy_receive;
   72 
   73 /*
   74  * Identify the physical page mapped at the given kernel virtual
   75  * address.  Insert this physical page into the given address space at
   76  * the given virtual address, replacing the physical page, if any,
   77  * that already exists there.
   78  */
   79 static int
   80 vm_pgmoveco(vm_map_t mapa, vm_offset_t kaddr, vm_offset_t uaddr)
   81 {
   82         vm_map_t map = mapa;
   83         vm_page_t kern_pg, user_pg;
   84         vm_object_t uobject;
   85         vm_map_entry_t entry;
   86         vm_pindex_t upindex;
   87         vm_prot_t prot;
   88         boolean_t wired;
   89 
   90         KASSERT((uaddr & PAGE_MASK) == 0,
   91             ("vm_pgmoveco: uaddr is not page aligned"));
   92 
   93         /*
   94          * Herein the physical page is validated and dirtied.  It is
   95          * unwired in sf_buf_mext().
   96          */
   97         kern_pg = PHYS_TO_VM_PAGE(vtophys(kaddr));
   98         kern_pg->valid = VM_PAGE_BITS_ALL;
   99         KASSERT(kern_pg->queue == PQ_NONE && kern_pg->wire_count == 1,
  100             ("vm_pgmoveco: kern_pg is not correctly wired"));
  101 
  102         if ((vm_map_lookup(&map, uaddr,
  103                            VM_PROT_WRITE, &entry, &uobject,
  104                            &upindex, &prot, &wired)) != KERN_SUCCESS) {
  105                 return(EFAULT);
  106         }
  107         VM_OBJECT_LOCK(uobject);
  108 retry:
  109         if ((user_pg = vm_page_lookup(uobject, upindex)) != NULL) {
  110                 if (vm_page_sleep_if_busy(user_pg, TRUE, "vm_pgmoveco"))
  111                         goto retry;
  112                 vm_page_lock(user_pg);
  113                 pmap_remove_all(user_pg);
  114                 vm_page_free(user_pg);
  115                 vm_page_unlock(user_pg);
  116         } else {
  117                 /*
  118                  * Even if a physical page does not exist in the
  119                  * object chain's first object, a physical page from a
  120                  * backing object may be mapped read only.
  121                  */
  122                 if (uobject->backing_object != NULL)
  123                         pmap_remove(map->pmap, uaddr, uaddr + PAGE_SIZE);
  124         }
  125         vm_page_insert(kern_pg, uobject, upindex);
  126         vm_page_dirty(kern_pg);
  127         VM_OBJECT_UNLOCK(uobject);
  128         vm_map_lookup_done(map, entry);
  129         return(KERN_SUCCESS);
  130 }
  131 #endif /* ZERO_COPY_SOCKETS */
  132 
  133 int
  134 copyin_nofault(const void *udaddr, void *kaddr, size_t len)
  135 {
  136         int error, save;
  137 
  138         save = vm_fault_disable_pagefaults();
  139         error = copyin(udaddr, kaddr, len);
  140         vm_fault_enable_pagefaults(save);
  141         return (error);
  142 }
  143 
  144 int
  145 copyout_nofault(const void *kaddr, void *udaddr, size_t len)
  146 {
  147         int error, save;
  148 
  149         save = vm_fault_disable_pagefaults();
  150         error = copyout(kaddr, udaddr, len);
  151         vm_fault_enable_pagefaults(save);
  152         return (error);
  153 }
  154 
  155 #define PHYS_PAGE_COUNT(len)    (howmany(len, PAGE_SIZE) + 1)
  156 
  157 int
  158 physcopyin(void *src, vm_paddr_t dst, size_t len)
  159 {
  160         vm_page_t m[PHYS_PAGE_COUNT(len)];
  161         struct iovec iov[1];
  162         struct uio uio;
  163         int i;
  164 
  165         iov[0].iov_base = src;
  166         iov[0].iov_len = len;
  167         uio.uio_iov = iov;
  168         uio.uio_iovcnt = 1;
  169         uio.uio_offset = 0;
  170         uio.uio_resid = len;
  171         uio.uio_segflg = UIO_SYSSPACE;
  172         uio.uio_rw = UIO_WRITE;
  173         for (i = 0; i < PHYS_PAGE_COUNT(len); i++, dst += PAGE_SIZE)
  174                 m[i] = PHYS_TO_VM_PAGE(dst);
  175         return (uiomove_fromphys(m, dst & PAGE_MASK, len, &uio));
  176 }
  177 
  178 int
  179 physcopyout(vm_paddr_t src, void *dst, size_t len)
  180 {
  181         vm_page_t m[PHYS_PAGE_COUNT(len)];
  182         struct iovec iov[1];
  183         struct uio uio;
  184         int i;
  185 
  186         iov[0].iov_base = dst;
  187         iov[0].iov_len = len;
  188         uio.uio_iov = iov;
  189         uio.uio_iovcnt = 1;
  190         uio.uio_offset = 0;
  191         uio.uio_resid = len;
  192         uio.uio_segflg = UIO_SYSSPACE;
  193         uio.uio_rw = UIO_READ;
  194         for (i = 0; i < PHYS_PAGE_COUNT(len); i++, src += PAGE_SIZE)
  195                 m[i] = PHYS_TO_VM_PAGE(src);
  196         return (uiomove_fromphys(m, src & PAGE_MASK, len, &uio));
  197 }
  198 
  199 #undef PHYS_PAGE_COUNT
  200 
  201 int
  202 uiomove(void *cp, int n, struct uio *uio)
  203 {
  204 
  205         return (uiomove_faultflag(cp, n, uio, 0));
  206 }
  207 
  208 int
  209 uiomove_nofault(void *cp, int n, struct uio *uio)
  210 {
  211 
  212         return (uiomove_faultflag(cp, n, uio, 1));
  213 }
  214 
  215 static int
  216 uiomove_faultflag(void *cp, int n, struct uio *uio, int nofault)
  217 {
  218         struct thread *td;
  219         struct iovec *iov;
  220         size_t cnt;
  221         int error, newflags, save;
  222 
  223         td = curthread;
  224         error = 0;
  225 
  226         KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
  227             ("uiomove: mode"));
  228         KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == td,
  229             ("uiomove proc"));
  230         if (!nofault)
  231                 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
  232                     "Calling uiomove()");
  233 
  234         /* XXX does it make a sense to set TDP_DEADLKTREAT for UIO_SYSSPACE ? */
  235         newflags = TDP_DEADLKTREAT;
  236         if (uio->uio_segflg == UIO_USERSPACE && nofault) {
  237                 /*
  238                  * Fail if a non-spurious page fault occurs.
  239                  */
  240                 newflags |= TDP_NOFAULTING | TDP_RESETSPUR;
  241         }
  242         save = curthread_pflags_set(newflags);
  243 
  244         while (n > 0 && uio->uio_resid) {
  245                 iov = uio->uio_iov;
  246                 cnt = iov->iov_len;
  247                 if (cnt == 0) {
  248                         uio->uio_iov++;
  249                         uio->uio_iovcnt--;
  250                         continue;
  251                 }
  252                 if (cnt > n)
  253                         cnt = n;
  254 
  255                 switch (uio->uio_segflg) {
  256 
  257                 case UIO_USERSPACE:
  258                         maybe_yield();
  259                         if (uio->uio_rw == UIO_READ)
  260                                 error = copyout(cp, iov->iov_base, cnt);
  261                         else
  262                                 error = copyin(iov->iov_base, cp, cnt);
  263                         if (error)
  264                                 goto out;
  265                         break;
  266 
  267                 case UIO_SYSSPACE:
  268                         if (uio->uio_rw == UIO_READ)
  269                                 bcopy(cp, iov->iov_base, cnt);
  270                         else
  271                                 bcopy(iov->iov_base, cp, cnt);
  272                         break;
  273                 case UIO_NOCOPY:
  274                         break;
  275                 }
  276                 iov->iov_base = (char *)iov->iov_base + cnt;
  277                 iov->iov_len -= cnt;
  278                 uio->uio_resid -= cnt;
  279                 uio->uio_offset += cnt;
  280                 cp = (char *)cp + cnt;
  281                 n -= cnt;
  282         }
  283 out:
  284         curthread_pflags_restore(save);
  285         return (error);
  286 }
  287 
  288 /*
  289  * Wrapper for uiomove() that validates the arguments against a known-good
  290  * kernel buffer.  Currently, uiomove accepts a signed (n) argument, which
  291  * is almost definitely a bad thing, so we catch that here as well.  We
  292  * return a runtime failure, but it might be desirable to generate a runtime
  293  * assertion failure instead.
  294  */
  295 int
  296 uiomove_frombuf(void *buf, int buflen, struct uio *uio)
  297 {
  298         size_t offset, n;
  299 
  300         if (uio->uio_offset < 0 || uio->uio_resid < 0 ||
  301             (offset = uio->uio_offset) != uio->uio_offset)
  302                 return (EINVAL);
  303         if (buflen <= 0 || offset >= buflen)
  304                 return (0);
  305         if ((n = buflen - offset) > IOSIZE_MAX)
  306                 return (EINVAL);
  307         return (uiomove((char *)buf + offset, n, uio));
  308 }
  309 
  310 #ifdef ZERO_COPY_SOCKETS
  311 /*
  312  * Experimental support for zero-copy I/O
  313  */
  314 static int
  315 userspaceco(void *cp, u_int cnt, struct uio *uio, int disposable)
  316 {
  317         struct iovec *iov;
  318         int error;
  319 
  320         iov = uio->uio_iov;
  321         if (uio->uio_rw == UIO_READ) {
  322                 if ((so_zero_copy_receive != 0)
  323                  && ((cnt & PAGE_MASK) == 0)
  324                  && ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0)
  325                  && ((uio->uio_offset & PAGE_MASK) == 0)
  326                  && ((((intptr_t) cp) & PAGE_MASK) == 0)
  327                  && (disposable != 0)) {
  328                         /* SOCKET: use page-trading */
  329                         /*
  330                          * We only want to call vm_pgmoveco() on
  331                          * disposeable pages, since it gives the
  332                          * kernel page to the userland process.
  333                          */
  334                         error = vm_pgmoveco(&curproc->p_vmspace->vm_map,
  335                             (vm_offset_t)cp, (vm_offset_t)iov->iov_base);
  336 
  337                         /*
  338                          * If we get an error back, attempt
  339                          * to use copyout() instead.  The
  340                          * disposable page should be freed
  341                          * automatically if we weren't able to move
  342                          * it into userland.
  343                          */
  344                         if (error != 0)
  345                                 error = copyout(cp, iov->iov_base, cnt);
  346                 } else {
  347                         error = copyout(cp, iov->iov_base, cnt);
  348                 }
  349         } else {
  350                 error = copyin(iov->iov_base, cp, cnt);
  351         }
  352         return (error);
  353 }
  354 
  355 int
  356 uiomoveco(void *cp, int n, struct uio *uio, int disposable)
  357 {
  358         struct iovec *iov;
  359         u_int cnt;
  360         int error;
  361 
  362         KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
  363             ("uiomoveco: mode"));
  364         KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
  365             ("uiomoveco proc"));
  366 
  367         while (n > 0 && uio->uio_resid) {
  368                 iov = uio->uio_iov;
  369                 cnt = iov->iov_len;
  370                 if (cnt == 0) {
  371                         uio->uio_iov++;
  372                         uio->uio_iovcnt--;
  373                         continue;
  374                 }
  375                 if (cnt > n)
  376                         cnt = n;
  377 
  378                 switch (uio->uio_segflg) {
  379 
  380                 case UIO_USERSPACE:
  381                         maybe_yield();
  382                         error = userspaceco(cp, cnt, uio, disposable);
  383                         if (error)
  384                                 return (error);
  385                         break;
  386 
  387                 case UIO_SYSSPACE:
  388                         if (uio->uio_rw == UIO_READ)
  389                                 bcopy(cp, iov->iov_base, cnt);
  390                         else
  391                                 bcopy(iov->iov_base, cp, cnt);
  392                         break;
  393                 case UIO_NOCOPY:
  394                         break;
  395                 }
  396                 iov->iov_base = (char *)iov->iov_base + cnt;
  397                 iov->iov_len -= cnt;
  398                 uio->uio_resid -= cnt;
  399                 uio->uio_offset += cnt;
  400                 cp = (char *)cp + cnt;
  401                 n -= cnt;
  402         }
  403         return (0);
  404 }
  405 #endif /* ZERO_COPY_SOCKETS */
  406 
  407 /*
  408  * Give next character to user as result of read.
  409  */
  410 int
  411 ureadc(int c, struct uio *uio)
  412 {
  413         struct iovec *iov;
  414         char *iov_base;
  415 
  416         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
  417             "Calling ureadc()");
  418 
  419 again:
  420         if (uio->uio_iovcnt == 0 || uio->uio_resid == 0)
  421                 panic("ureadc");
  422         iov = uio->uio_iov;
  423         if (iov->iov_len == 0) {
  424                 uio->uio_iovcnt--;
  425                 uio->uio_iov++;
  426                 goto again;
  427         }
  428         switch (uio->uio_segflg) {
  429 
  430         case UIO_USERSPACE:
  431                 if (subyte(iov->iov_base, c) < 0)
  432                         return (EFAULT);
  433                 break;
  434 
  435         case UIO_SYSSPACE:
  436                 iov_base = iov->iov_base;
  437                 *iov_base = c;
  438                 iov->iov_base = iov_base;
  439                 break;
  440 
  441         case UIO_NOCOPY:
  442                 break;
  443         }
  444         iov->iov_base = (char *)iov->iov_base + 1;
  445         iov->iov_len--;
  446         uio->uio_resid--;
  447         uio->uio_offset++;
  448         return (0);
  449 }
  450 
  451 int
  452 copyinfrom(const void * __restrict src, void * __restrict dst, size_t len,
  453     int seg)
  454 {
  455         int error = 0;
  456 
  457         switch (seg) {
  458         case UIO_USERSPACE:
  459                 error = copyin(src, dst, len);
  460                 break;
  461         case UIO_SYSSPACE:
  462                 bcopy(src, dst, len);
  463                 break;
  464         default:
  465                 panic("copyinfrom: bad seg %d\n", seg);
  466         }
  467         return (error);
  468 }
  469 
  470 int
  471 copyinstrfrom(const void * __restrict src, void * __restrict dst, size_t len,
  472     size_t * __restrict copied, int seg)
  473 {
  474         int error = 0;
  475 
  476         switch (seg) {
  477         case UIO_USERSPACE:
  478                 error = copyinstr(src, dst, len, copied);
  479                 break;
  480         case UIO_SYSSPACE:
  481                 error = copystr(src, dst, len, copied);
  482                 break;
  483         default:
  484                 panic("copyinstrfrom: bad seg %d\n", seg);
  485         }
  486         return (error);
  487 }
  488 
  489 int
  490 copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov, int error)
  491 {
  492         u_int iovlen;
  493 
  494         *iov = NULL;
  495         if (iovcnt > UIO_MAXIOV)
  496                 return (error);
  497         iovlen = iovcnt * sizeof (struct iovec);
  498         *iov = malloc(iovlen, M_IOV, M_WAITOK);
  499         error = copyin(iovp, *iov, iovlen);
  500         if (error) {
  501                 free(*iov, M_IOV);
  502                 *iov = NULL;
  503         }
  504         return (error);
  505 }
  506 
  507 int
  508 copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop)
  509 {
  510         struct iovec *iov;
  511         struct uio *uio;
  512         u_int iovlen;
  513         int error, i;
  514 
  515         *uiop = NULL;
  516         if (iovcnt > UIO_MAXIOV)
  517                 return (EINVAL);
  518         iovlen = iovcnt * sizeof (struct iovec);
  519         uio = malloc(iovlen + sizeof *uio, M_IOV, M_WAITOK);
  520         iov = (struct iovec *)(uio + 1);
  521         error = copyin(iovp, iov, iovlen);
  522         if (error) {
  523                 free(uio, M_IOV);
  524                 return (error);
  525         }
  526         uio->uio_iov = iov;
  527         uio->uio_iovcnt = iovcnt;
  528         uio->uio_segflg = UIO_USERSPACE;
  529         uio->uio_offset = -1;
  530         uio->uio_resid = 0;
  531         for (i = 0; i < iovcnt; i++) {
  532                 if (iov->iov_len > IOSIZE_MAX - uio->uio_resid) {
  533                         free(uio, M_IOV);
  534                         return (EINVAL);
  535                 }
  536                 uio->uio_resid += iov->iov_len;
  537                 iov++;
  538         }
  539         *uiop = uio;
  540         return (0);
  541 }
  542 
  543 struct uio *
  544 cloneuio(struct uio *uiop)
  545 {
  546         struct uio *uio;
  547         int iovlen;
  548 
  549         iovlen = uiop->uio_iovcnt * sizeof (struct iovec);
  550         uio = malloc(iovlen + sizeof *uio, M_IOV, M_WAITOK);
  551         *uio = *uiop;
  552         uio->uio_iov = (struct iovec *)(uio + 1);
  553         bcopy(uiop->uio_iov, uio->uio_iov, iovlen);
  554         return (uio);
  555 }
  556 
  557 /*
  558  * Map some anonymous memory in user space of size sz, rounded up to the page
  559  * boundary.
  560  */
  561 int
  562 copyout_map(struct thread *td, vm_offset_t *addr, size_t sz)
  563 {
  564         struct vmspace *vms;
  565         int error;
  566         vm_size_t size;
  567 
  568         vms = td->td_proc->p_vmspace;
  569 
  570         /*
  571          * Map somewhere after heap in process memory.
  572          */
  573         PROC_LOCK(td->td_proc);
  574         *addr = round_page((vm_offset_t)vms->vm_daddr +
  575             lim_max(td->td_proc, RLIMIT_DATA));
  576         PROC_UNLOCK(td->td_proc);
  577 
  578         /* round size up to page boundry */
  579         size = (vm_size_t)round_page(sz);
  580 
  581         error = vm_mmap(&vms->vm_map, addr, size, PROT_READ | PROT_WRITE,
  582             VM_PROT_ALL, MAP_PRIVATE | MAP_ANON, OBJT_DEFAULT, NULL, 0);
  583 
  584         return (error);
  585 }
  586 
  587 /*
  588  * Unmap memory in user space.
  589  */
  590 int
  591 copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz)
  592 {
  593         vm_map_t map;
  594         vm_size_t size;
  595 
  596         if (sz == 0)
  597                 return (0);
  598 
  599         map = &td->td_proc->p_vmspace->vm_map;
  600         size = (vm_size_t)round_page(sz);
  601 
  602         if (vm_map_remove(map, addr, addr + size) != KERN_SUCCESS)
  603                 return (EINVAL);
  604 
  605         return (0);
  606 }

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