uma_dbg.c

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    1 /*-
    2  * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
    3  * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice unmodified, this list of conditions, and the following
   11  *    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 ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 /*
   29  * uma_dbg.c    Debugging features for UMA users
   30  *
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/11.1/sys/vm/uma_dbg.c 301176 2016-06-01 22:31:35Z markj $");
   35 
   36 #include "opt_vm.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/bitset.h>
   41 #include <sys/kernel.h>
   42 #include <sys/types.h>
   43 #include <sys/queue.h>
   44 #include <sys/lock.h>
   45 #include <sys/mutex.h>
   46 #include <sys/malloc.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/vm_object.h>
   50 #include <vm/vm_page.h>
   51 #include <vm/uma.h>
   52 #include <vm/uma_int.h>
   53 #include <vm/uma_dbg.h>
   54 #include <vm/memguard.h>
   55 
   56 static const uint32_t uma_junk = 0xdeadc0de;
   57 
   58 /*
   59  * Checks an item to make sure it hasn't been overwritten since it was freed,
   60  * prior to subsequent reallocation.
   61  *
   62  * Complies with standard ctor arg/return
   63  */
   64 int
   65 trash_ctor(void *mem, int size, void *arg, int flags)
   66 {
   67         int cnt;
   68         uint32_t *p;
   69 
   70 #ifdef DEBUG_MEMGUARD
   71         if (is_memguard_addr(mem))
   72                 return (0);
   73 #endif
   74 
   75         cnt = size / sizeof(uma_junk);
   76 
   77         for (p = mem; cnt > 0; cnt--, p++)
   78                 if (*p != uma_junk) {
   79 #ifdef INVARIANTS
   80                         panic("Memory modified after free %p(%d) val=%x @ %p\n",
   81                             mem, size, *p, p);
   82 #else
   83                         printf("Memory modified after free %p(%d) val=%x @ %p\n",
   84                             mem, size, *p, p);
   85 #endif
   86                         return (0);
   87                 }
   88         return (0);
   89 }
   90 
   91 /*
   92  * Fills an item with predictable garbage
   93  *
   94  * Complies with standard dtor arg/return
   95  *
   96  */
   97 void
   98 trash_dtor(void *mem, int size, void *arg)
   99 {
  100         int cnt;
  101         uint32_t *p;
  102 
  103 #ifdef DEBUG_MEMGUARD
  104         if (is_memguard_addr(mem))
  105                 return;
  106 #endif
  107 
  108         cnt = size / sizeof(uma_junk);
  109 
  110         for (p = mem; cnt > 0; cnt--, p++)
  111                 *p = uma_junk;
  112 }
  113 
  114 /*
  115  * Fills an item with predictable garbage
  116  *
  117  * Complies with standard init arg/return
  118  *
  119  */
  120 int
  121 trash_init(void *mem, int size, int flags)
  122 {
  123         trash_dtor(mem, size, NULL);
  124         return (0);
  125 }
  126 
  127 /*
  128  * Checks an item to make sure it hasn't been overwritten since it was freed.
  129  *
  130  * Complies with standard fini arg/return
  131  *
  132  */
  133 void
  134 trash_fini(void *mem, int size)
  135 {
  136         (void)trash_ctor(mem, size, NULL, 0);
  137 }
  138 
  139 int
  140 mtrash_ctor(void *mem, int size, void *arg, int flags)
  141 {
  142         struct malloc_type **ksp;
  143         uint32_t *p = mem;
  144         int cnt;
  145 
  146 #ifdef DEBUG_MEMGUARD
  147         if (is_memguard_addr(mem))
  148                 return (0);
  149 #endif
  150 
  151         size -= sizeof(struct malloc_type *);
  152         ksp = (struct malloc_type **)mem;
  153         ksp += size / sizeof(struct malloc_type *);
  154         cnt = size / sizeof(uma_junk);
  155 
  156         for (p = mem; cnt > 0; cnt--, p++)
  157                 if (*p != uma_junk) {
  158                         printf("Memory modified after free %p(%d) val=%x @ %p\n",
  159                             mem, size, *p, p);
  160                         panic("Most recently used by %s\n", (*ksp == NULL)?
  161                             "none" : (*ksp)->ks_shortdesc);
  162                 }
  163         return (0);
  164 }
  165 
  166 /*
  167  * Fills an item with predictable garbage
  168  *
  169  * Complies with standard dtor arg/return
  170  *
  171  */
  172 void
  173 mtrash_dtor(void *mem, int size, void *arg)
  174 {
  175         int cnt;
  176         uint32_t *p;
  177 
  178 #ifdef DEBUG_MEMGUARD
  179         if (is_memguard_addr(mem))
  180                 return;
  181 #endif
  182 
  183         size -= sizeof(struct malloc_type *);
  184         cnt = size / sizeof(uma_junk);
  185 
  186         for (p = mem; cnt > 0; cnt--, p++)
  187                 *p = uma_junk;
  188 }
  189 
  190 /*
  191  * Fills an item with predictable garbage
  192  *
  193  * Complies with standard init arg/return
  194  *
  195  */
  196 int
  197 mtrash_init(void *mem, int size, int flags)
  198 {
  199         struct malloc_type **ksp;
  200 
  201 #ifdef DEBUG_MEMGUARD
  202         if (is_memguard_addr(mem))
  203                 return (0);
  204 #endif
  205 
  206         mtrash_dtor(mem, size, NULL);
  207 
  208         ksp = (struct malloc_type **)mem;
  209         ksp += (size / sizeof(struct malloc_type *)) - 1;
  210         *ksp = NULL;
  211         return (0);
  212 }
  213 
  214 /*
  215  * Checks an item to make sure it hasn't been overwritten since it was freed,
  216  * prior to freeing it back to available memory.
  217  *
  218  * Complies with standard fini arg/return
  219  *
  220  */
  221 void
  222 mtrash_fini(void *mem, int size)
  223 {
  224         (void)mtrash_ctor(mem, size, NULL, 0);
  225 }

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FreeBSD/Linux Kernel Cross Reference sys/vm/uma_dbg.c

FreeBSD/Linux Kernel Cross Reference
sys/vm/uma_dbg.c