svr4_resource.c

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    1 /*      $NetBSD: svr4_resource.c,v 1.16.10.1 2009/04/01 00:25:22 snj Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Christos Zoulas.
    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  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: svr4_resource.c,v 1.16.10.1 2009/04/01 00:25:22 snj Exp $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/proc.h>
   38 #include <sys/file.h>
   39 #include <sys/resource.h>
   40 #include <sys/resourcevar.h>
   41 
   42 #include <compat/svr4/svr4_types.h>
   43 #include <compat/svr4/svr4_resource.h>
   44 #include <compat/svr4/svr4_signal.h>
   45 #include <compat/svr4/svr4_lwp.h>
   46 #include <compat/svr4/svr4_ucontext.h>
   47 #include <compat/svr4/svr4_syscallargs.h>
   48 #include <compat/svr4/svr4_util.h>
   49 
   50 static inline int svr4_to_native_rl(int);
   51 
   52 static inline int
   53 svr4_to_native_rl(int rl)
   54 {
   55         switch (rl) {
   56         case SVR4_RLIMIT_CPU:
   57                 return RLIMIT_CPU;
   58         case SVR4_RLIMIT_FSIZE:
   59                 return RLIMIT_FSIZE;
   60         case SVR4_RLIMIT_DATA:
   61                 return RLIMIT_DATA;
   62         case SVR4_RLIMIT_STACK:
   63                 return RLIMIT_STACK;
   64         case SVR4_RLIMIT_CORE:
   65                 return RLIMIT_CORE;
   66         case SVR4_RLIMIT_NOFILE:
   67                 return RLIMIT_NOFILE;
   68         case SVR4_RLIMIT_VMEM:
   69                 return RLIMIT_AS;
   70         default:
   71                 return -1;
   72         }
   73 }
   74 
   75 /*
   76  * Check if the resource limit fits within the BSD range and it is not
   77  * one of the magic SVR4 limit values
   78  */
   79 #define OKLIMIT(l) (((int32_t)(l)) >= 0 && ((int32_t)(l)) < 0x7fffffff && \
   80         ((svr4_rlim_t)(l)) != SVR4_RLIM_INFINITY && \
   81         ((svr4_rlim_t)(l)) != SVR4_RLIM_SAVED_CUR && \
   82         ((svr4_rlim_t)(l)) != SVR4_RLIM_SAVED_MAX)
   83 
   84 #define OKLIMIT64(l) (((rlim_t)(l)) >= 0 && ((rlim_t)(l)) < RLIM_INFINITY && \
   85         ((svr4_rlim64_t)(l)) != SVR4_RLIM64_INFINITY && \
   86         ((svr4_rlim64_t)(l)) != SVR4_RLIM64_SAVED_CUR && \
   87         ((svr4_rlim64_t)(l)) != SVR4_RLIM64_SAVED_MAX)
   88 
   89 int
   90 svr4_sys_getrlimit(struct lwp *l, const struct svr4_sys_getrlimit_args *uap, register_t *retval)
   91 {
   92         int rl = svr4_to_native_rl(SCARG(uap, which));
   93         struct proc *p = l->l_proc;
   94         struct rlimit blim;
   95         struct svr4_rlimit slim;
   96 
   97         if (rl == -1)
   98                 return EINVAL;
   99 
  100         blim = p->p_rlimit[rl];
  101 
  102         /*
  103          * Our infinity, is their maxfiles.
  104          */
  105         if (rl == RLIMIT_NOFILE && blim.rlim_max == RLIM_INFINITY)
  106                 blim.rlim_max = maxfiles;
  107 
  108         /*
  109          * If the limit can be be represented, it is returned.
  110          * Otherwise, if rlim_cur == rlim_max, return RLIM_SAVED_MAX
  111          * else return RLIM_SAVED_CUR
  112          */
  113         if (blim.rlim_max == RLIM_INFINITY)
  114                 slim.rlim_max = SVR4_RLIM_INFINITY;
  115         else if (OKLIMIT(blim.rlim_max))
  116                 slim.rlim_max = (svr4_rlim_t) blim.rlim_max;
  117         else
  118                 slim.rlim_max = SVR4_RLIM_SAVED_MAX;
  119 
  120         if (blim.rlim_cur == RLIM_INFINITY)
  121                 slim.rlim_cur = SVR4_RLIM_INFINITY;
  122         else if (OKLIMIT(blim.rlim_cur))
  123                 slim.rlim_cur = (svr4_rlim_t) blim.rlim_cur;
  124         else if (blim.rlim_max == blim.rlim_cur)
  125                 slim.rlim_cur = SVR4_RLIM_SAVED_MAX;
  126         else
  127                 slim.rlim_cur = SVR4_RLIM_SAVED_CUR;
  128 
  129         return copyout(&slim, SCARG(uap, rlp), sizeof(*SCARG(uap, rlp)));
  130 }
  131 
  132 
  133 int
  134 svr4_sys_setrlimit(struct lwp *l, const struct svr4_sys_setrlimit_args *uap, register_t *retval)
  135 {
  136         int rl = svr4_to_native_rl(SCARG(uap, which));
  137         struct rlimit blim, *limp;
  138         struct svr4_rlimit slim;
  139         int error;
  140 
  141         if (rl == -1)
  142                 return EINVAL;
  143 
  144         limp = &l->l_proc->p_rlimit[rl];
  145 
  146         if ((error = copyin(SCARG(uap, rlp), &slim, sizeof(slim))) != 0)
  147                 return error;
  148 
  149         /*
  150          * if the limit is SVR4_RLIM_INFINITY, then we set it to our
  151          * unlimited.
  152          * We should also: If it is SVR4_RLIM_SAVED_MAX, we should set the
  153          * new limit to the corresponding saved hard limit, and if
  154          * it is equal to SVR4_RLIM_SAVED_CUR, we should set it to the
  155          * corresponding saved soft limit.
  156          *
  157          */
  158         if (slim.rlim_max == SVR4_RLIM_INFINITY)
  159                 blim.rlim_max = RLIM_INFINITY;
  160         else if (OKLIMIT(slim.rlim_max))
  161                 blim.rlim_max = (rlim_t) slim.rlim_max;
  162         else if (slim.rlim_max == SVR4_RLIM_SAVED_MAX)
  163                 blim.rlim_max = limp->rlim_max;
  164         else if (slim.rlim_max == SVR4_RLIM_SAVED_CUR)
  165                 blim.rlim_max = limp->rlim_cur;
  166 
  167         if (slim.rlim_cur == SVR4_RLIM_INFINITY)
  168                 blim.rlim_cur = RLIM_INFINITY;
  169         else if (OKLIMIT(slim.rlim_cur))
  170                 blim.rlim_cur = (rlim_t) slim.rlim_cur;
  171         else if (slim.rlim_cur == SVR4_RLIM_SAVED_MAX)
  172                 blim.rlim_cur = limp->rlim_max;
  173         else if (slim.rlim_cur == SVR4_RLIM_SAVED_CUR)
  174                 blim.rlim_cur = limp->rlim_cur;
  175 
  176         return dosetrlimit(l, l->l_proc, rl, &blim);
  177 }
  178 
  179 
  180 int
  181 svr4_sys_getrlimit64(struct lwp *l, const struct svr4_sys_getrlimit64_args *uap, register_t *retval)
  182 {
  183         int rl = svr4_to_native_rl(SCARG(uap, which));
  184         struct proc *p = l->l_proc;
  185         struct rlimit blim;
  186         struct svr4_rlimit64 slim;
  187 
  188         if (rl == -1)
  189                 return EINVAL;
  190 
  191         blim = p->p_rlimit[rl];
  192 
  193         /*
  194          * Our infinity, is their maxfiles.
  195          */
  196         if (rl == RLIMIT_NOFILE && blim.rlim_max == RLIM_INFINITY)
  197                 blim.rlim_max = maxfiles;
  198 
  199         /*
  200          * If the limit can be be represented, it is returned.
  201          * Otherwise, if rlim_cur == rlim_max, return SVR4_RLIM_SAVED_MAX
  202          * else return SVR4_RLIM_SAVED_CUR
  203          */
  204         if (blim.rlim_max == RLIM_INFINITY)
  205                 slim.rlim_max = SVR4_RLIM64_INFINITY;
  206         else if (OKLIMIT64(blim.rlim_max))
  207                 slim.rlim_max = (svr4_rlim64_t) blim.rlim_max;
  208         else
  209                 slim.rlim_max = SVR4_RLIM64_SAVED_MAX;
  210 
  211         if (blim.rlim_cur == RLIM_INFINITY)
  212                 slim.rlim_cur = SVR4_RLIM64_INFINITY;
  213         else if (OKLIMIT64(blim.rlim_cur))
  214                 slim.rlim_cur = (svr4_rlim64_t) blim.rlim_cur;
  215         else if (blim.rlim_max == blim.rlim_cur)
  216                 slim.rlim_cur = SVR4_RLIM64_SAVED_MAX;
  217         else
  218                 slim.rlim_cur = SVR4_RLIM64_SAVED_CUR;
  219 
  220         return copyout(&slim, SCARG(uap, rlp), sizeof(*SCARG(uap, rlp)));
  221 }
  222 
  223 
  224 int
  225 svr4_sys_setrlimit64(struct lwp *l, const struct svr4_sys_setrlimit64_args *uap, register_t *retval)
  226 {
  227         int rl = svr4_to_native_rl(SCARG(uap, which));
  228         struct rlimit blim, *limp;
  229         struct svr4_rlimit64 slim;
  230         int error;
  231 
  232         if (rl == -1)
  233                 return EINVAL;
  234 
  235         limp = &l->l_proc->p_rlimit[rl];
  236 
  237         if ((error = copyin(SCARG(uap, rlp), &slim, sizeof(slim))) != 0)
  238                 return error;
  239 
  240         /*
  241          * if the limit is SVR4_RLIM64_INFINITY, then we set it to our
  242          * unlimited.
  243          * We should also: If it is SVR4_RLIM64_SAVED_MAX, we should set the
  244          * new limit to the corresponding saved hard limit, and if
  245          * it is equal to SVR4_RLIM64_SAVED_CUR, we should set it to the
  246          * corresponding saved soft limit.
  247          *
  248          */
  249         if (slim.rlim_max == SVR4_RLIM64_INFINITY)
  250                 blim.rlim_max = RLIM_INFINITY;
  251         else if (OKLIMIT64(slim.rlim_max))
  252                 blim.rlim_max = (rlim_t) slim.rlim_max;
  253         else if (slim.rlim_max == SVR4_RLIM64_SAVED_MAX)
  254                 blim.rlim_max = limp->rlim_max;
  255         else if (slim.rlim_max == SVR4_RLIM64_SAVED_CUR)
  256                 blim.rlim_max = limp->rlim_cur;
  257 
  258         if (slim.rlim_cur == SVR4_RLIM64_INFINITY)
  259                 blim.rlim_cur = RLIM_INFINITY;
  260         else if (OKLIMIT64(slim.rlim_cur))
  261                 blim.rlim_cur = (rlim_t) slim.rlim_cur;
  262         else if (slim.rlim_cur == SVR4_RLIM64_SAVED_MAX)
  263                 blim.rlim_cur = limp->rlim_max;
  264         else if (slim.rlim_cur == SVR4_RLIM64_SAVED_CUR)
  265                 blim.rlim_cur = limp->rlim_cur;
  266 
  267         return dosetrlimit(l, l->l_proc, rl, &blim);
  268 }
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