src/runtime/validate.c

   1 /*
   2  * memory validation
   3  */
   4
   5 /*
   6  * This software is part of the SBCL system. See the README file for
   7  * more information.
   8  *
   9  * This software is derived from the CMU CL system, which was
  10  * written at Carnegie Mellon University and released into the
  11  * public domain. The software is in the public domain and is
  12  * provided with absolutely no warranty. See the COPYING and CREDITS
  13  * files for more information.
  14  */
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18
  19 #include "sbcl.h"
  20 #include "runtime.h"
  21 #include "os.h"
  22 #include "globals.h"
  23 #include "validate.h"
  24
  25 static void
  26 ensure_space(lispobj *start, unsigned long size)
  27 {
  28     if (os_validate((os_vm_address_t)start,(os_vm_size_t)size)==NULL) {
  29         fprintf(stderr,
  30                 "ensure_space: failed to validate %ld bytes at 0x%08lx\n",
  31                 size,
  32                 (unsigned long)start);
  33         fprintf(stderr,
  34                 "(hint: Try \"ulimit -a\"; maybe you should increase memory limits.)\n");
  35         exit(1);
  36     }
  37 }
  38
  39 os_vm_address_t undefined_alien_address = 0;
  40
  41 static void
  42 ensure_undefined_alien(void) {
  43     os_vm_address_t start = os_validate(NULL, os_vm_page_size);
  44     if (start) {
  45         os_protect(start, os_vm_page_size, OS_VM_PROT_NONE);
  46         undefined_alien_address = start;
  47     } else {
  48         lose("could not allocate guard page for undefined alien");
  49     }
  50 }
  51
  52 void
  53 validate(void)
  54 {
  55 #ifdef PRINTNOISE
  56     printf("validating memory ...");
  57     fflush(stdout);
  58 #endif
  59
  60     ensure_space( (lispobj *)READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE);
  61     ensure_space( (lispobj *)STATIC_SPACE_START   , STATIC_SPACE_SIZE);
  62 #ifdef LISP_FEATURE_GENCGC
  63     ensure_space( (lispobj *)DYNAMIC_SPACE_START  , DYNAMIC_SPACE_SIZE);
  64 #else
  65     ensure_space( (lispobj *)DYNAMIC_0_SPACE_START  , DYNAMIC_SPACE_SIZE);
  66     ensure_space( (lispobj *)DYNAMIC_1_SPACE_START  , DYNAMIC_SPACE_SIZE);
  67 #endif
  68
  69 #ifdef LISP_FEATURE_LINKAGE_TABLE
  70     ensure_space( (lispobj *)LINKAGE_TABLE_SPACE_START, LINKAGE_TABLE_SPACE_SIZE);
  71 #endif
  72
  73 #ifdef LISP_FEATURE_OS_PROVIDES_DLOPEN
  74     ensure_undefined_alien();
  75 #endif
  76
  77 #ifdef PRINTNOISE
  78     printf(" done.\n");
  79 #endif
  80 }
  81
  82 void
  83 protect_control_stack_guard_page(pid_t t_id, int protect_p) {
  84     struct thread *th = find_thread_by_pid(t_id);
  85     os_protect(CONTROL_STACK_GUARD_PAGE(th),
  86                os_vm_page_size,protect_p ?
  87                (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
  88 }
  89
  90 void
  91 protect_control_stack_return_guard_page(pid_t t_id, int protect_p) {
  92     struct thread *th = find_thread_by_pid(t_id);
  93     os_protect(CONTROL_STACK_RETURN_GUARD_PAGE(th),
  94                os_vm_page_size,protect_p ?
  95                (OS_VM_PROT_READ|OS_VM_PROT_EXECUTE) : OS_VM_PROT_ALL);
  96 }