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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
      * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * uma_dbg.c    Debugging features for UMA users
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/vm/uma_dbg.c 326272 2017-11-27 15:23:17Z pfg $");
    
    #include "opt_vm.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bitset.h>
    #include <sys/kernel.h>
    #include <sys/types.h>
    #include <sys/queue.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/malloc.h>
    
    #include <vm/vm.h>
    #include <vm/vm_object.h>
    #include <vm/vm_page.h>
    #include <vm/uma.h>
    #include <vm/uma_int.h>
    #include <vm/uma_dbg.h>
    #include <vm/memguard.h>
    
    static const uint32_t uma_junk = 0xdeadc0de;
    
    /*
     * Checks an item to make sure it hasn't been overwritten since it was freed,
     * prior to subsequent reallocation.
     *
     * Complies with standard ctor arg/return
     */
    int
    trash_ctor(void *mem, int size, void *arg, int flags)
    {
            int cnt;
            uint32_t *p;
    
    #ifdef DEBUG_MEMGUARD
            if (is_memguard_addr(mem))
                    return (0);
    #endif
    
            cnt = size / sizeof(uma_junk);
    
            for (p = mem; cnt > 0; cnt--, p++)
                    if (*p != uma_junk) {
    #ifdef INVARIANTS
                            panic("Memory modified after free %p(%d) val=%x @ %p\n",
                                mem, size, *p, p);
    #else
                            printf("Memory modified after free %p(%d) val=%x @ %p\n",
                                mem, size, *p, p);
    #endif
                            return (0);
                    }
            return (0);
    }
    
    /*
     * Fills an item with predictable garbage
     *
     * Complies with standard dtor arg/return
     *
     */
    void
   trash_dtor(void *mem, int size, void *arg)
   {
           int cnt;
           uint32_t *p;
   
   #ifdef DEBUG_MEMGUARD
           if (is_memguard_addr(mem))
                   return;
   #endif
   
           cnt = size / sizeof(uma_junk);
   
           for (p = mem; cnt > 0; cnt--, p++)
                   *p = uma_junk;
   }
   
   /*
    * Fills an item with predictable garbage
    *
    * Complies with standard init arg/return
    *
    */
   int
   trash_init(void *mem, int size, int flags)
   {
           trash_dtor(mem, size, NULL);
           return (0);
   }
   
   /*
    * Checks an item to make sure it hasn't been overwritten since it was freed.
    *
    * Complies with standard fini arg/return
    *
    */
   void
   trash_fini(void *mem, int size)
   {
           (void)trash_ctor(mem, size, NULL, 0);
   }
   
   int
   mtrash_ctor(void *mem, int size, void *arg, int flags)
   {
           struct malloc_type **ksp;
           uint32_t *p = mem;
           int cnt;
   
   #ifdef DEBUG_MEMGUARD
           if (is_memguard_addr(mem))
                   return (0);
   #endif
   
           size -= sizeof(struct malloc_type *);
           ksp = (struct malloc_type **)mem;
           ksp += size / sizeof(struct malloc_type *);
           cnt = size / sizeof(uma_junk);
   
           for (p = mem; cnt > 0; cnt--, p++)
                   if (*p != uma_junk) {
                           printf("Memory modified after free %p(%d) val=%x @ %p\n",
                               mem, size, *p, p);
                           panic("Most recently used by %s\n", (*ksp == NULL)?
                               "none" : (*ksp)->ks_shortdesc);
                   }
           return (0);
   }
   
   /*
    * Fills an item with predictable garbage
    *
    * Complies with standard dtor arg/return
    *
    */
   void
   mtrash_dtor(void *mem, int size, void *arg)
   {
           int cnt;
           uint32_t *p;
   
   #ifdef DEBUG_MEMGUARD
           if (is_memguard_addr(mem))
                   return;
   #endif
   
           size -= sizeof(struct malloc_type *);
           cnt = size / sizeof(uma_junk);
   
           for (p = mem; cnt > 0; cnt--, p++)
                   *p = uma_junk;
   }
   
   /*
    * Fills an item with predictable garbage
    *
    * Complies with standard init arg/return
    *
    */
   int
   mtrash_init(void *mem, int size, int flags)
   {
           struct malloc_type **ksp;
   
   #ifdef DEBUG_MEMGUARD
           if (is_memguard_addr(mem))
                   return (0);
   #endif
   
           mtrash_dtor(mem, size, NULL);
   
           ksp = (struct malloc_type **)mem;
           ksp += (size / sizeof(struct malloc_type *)) - 1;
           *ksp = NULL;
           return (0);
   }
   
   /*
    * Checks an item to make sure it hasn't been overwritten since it was freed,
    * prior to freeing it back to available memory.
    *
    * Complies with standard fini arg/return
    *
    */
   void
   mtrash_fini(void *mem, int size)
   {
           (void)mtrash_ctor(mem, size, NULL, 0);
   }

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