1                 : /*
       2                 :  * Copyright (c) 2011 The Native Client Authors. All rights reserved.
       3                 :  * Use of this source code is governed by a BSD-style license that can be
       4                 :  * found in the LICENSE file.
       5                 :  */
       6                 : 
       7                 : #include <errno.h>
       8                 : #include <sys/resource.h>
       9                 : #include <string.h>
      10                 : 
      11                 : #include "native_client/src/shared/platform/nacl_log.h"
      12                 : #include "native_client/src/trusted/service_runtime/sel_addrspace.h"
      13                 : 
      14                 : /*
      15                 :  * If we have a soft limit for RLIMIT_AS lower than the hard limit,
      16                 :  * increase it to include enough for the untrusted address space.
      17                 :  */
      18               4 : void NaClAddrSpaceBeforeAlloc(size_t untrusted_size) {
      19                 :   struct rlimit lim;
      20                 : 
      21                 :   UNREFERENCED_PARAMETER(untrusted_size);
      22                 : 
      23               4 :   if (getrlimit(RLIMIT_AS, &lim) < 0) {
      24               0 :     NaClLog(LOG_WARNING, "NaClAddrSpaceBeforeAlloc: getrlimit failed: %s",
      25                 :             strerror(errno));
      26               0 :     return;
      27                 :   }
      28                 : 
      29                 :   /*
      30                 :    * We don't just increase it by untrusted_size, because we need a
      31                 :    * contiguous piece of that size, and that may stretch the overall
      32                 :    * address space we need to occupy well beyond the sum of the old
      33                 :    * limit and untrusted_size.
      34                 :    */
      35               4 :   if (lim.rlim_cur < lim.rlim_max) {
      36               0 :     NaClLog(LOG_INFO, "NaClAddrSpaceBeforeAlloc: "
      37                 :             "raising RLIMIT_AS from %#lx to hard limit %#lx\n",
      38                 :             (unsigned long) lim.rlim_cur,
      39                 :             (unsigned long) lim.rlim_max);
      40               0 :     lim.rlim_cur = lim.rlim_max;
      41               0 :     if (setrlimit(RLIMIT_AS, &lim) < 0) {
      42               0 :       NaClLog(LOG_WARNING, "NaClAddrSpaceBeforeAlloc: setrlimit failed: %s",
      43                 :               strerror(errno));
      44                 :     }
      45                 :   }
      46                 : }