/*-
* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@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, 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 AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
SYSCTL_NODE(_debug, OID_AUTO, redzone, CTLFLAG_RW, 0, "");
#define REDZONE_MALLOC_UNDERFLOW 0
#define REDZONE_MALLOC_OVERFLOW 1
#define REDZONE_REALLOC_SMALLER_UNDERFLOW 2
#define REDZONE_REALLOC_SMALLER_OVERFLOW 3
#define REDZONE_REALLOC_BIGGER_UNDERFLOW 4
#define REDZONE_REALLOC_BIGGER_OVERFLOW 5
static int
redzone_sysctl(SYSCTL_HANDLER_ARGS)
{
u_char *p = NULL;
int error, val = 0;
error = sysctl_handle_int(oidp, &val, sizeof(val), req);
if (error != 0 || req->newptr == NULL)
return (0);
switch (arg2) {
case REDZONE_MALLOC_UNDERFLOW:
p = malloc(10, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
p[-1] = '\0';
break;
case REDZONE_MALLOC_OVERFLOW:
p = malloc(10, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
p[10] = '\0';
break;
case REDZONE_REALLOC_SMALLER_UNDERFLOW:
p = malloc(8192, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
p[-1] = '\0';
p = realloc(p, 10, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
break;
case REDZONE_REALLOC_SMALLER_OVERFLOW:
p = malloc(8192, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
p[8192] = '\0';
p = realloc(p, 10, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
break;
case REDZONE_REALLOC_BIGGER_UNDERFLOW:
p = malloc(10, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
p[-1] = '\0';
p = realloc(p, 8192, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
break;
case REDZONE_REALLOC_BIGGER_OVERFLOW:
p = malloc(10, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
p[10] = '\0';
p = realloc(p, 8192, M_TEMP, M_NOWAIT);
if (p == NULL)
return (ENOMEM);
break;
}
free(p, M_TEMP);
return (0);
}
SYSCTL_PROC(_debug_redzone, OID_AUTO, malloc_underflow, CTLTYPE_INT | CTLFLAG_RW,
NULL, REDZONE_MALLOC_UNDERFLOW, redzone_sysctl, "I", "");
SYSCTL_PROC(_debug_redzone, OID_AUTO, malloc_overflow, CTLTYPE_INT | CTLFLAG_RW,
NULL, REDZONE_MALLOC_OVERFLOW, redzone_sysctl, "I", "");
SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_smaller_underflow, CTLTYPE_INT | CTLFLAG_RW,
NULL, REDZONE_REALLOC_SMALLER_UNDERFLOW, redzone_sysctl, "I", "");
SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_smaller_overflow, CTLTYPE_INT | CTLFLAG_RW,
NULL, REDZONE_REALLOC_SMALLER_OVERFLOW, redzone_sysctl, "I", "");
SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_bigger_underflow, CTLTYPE_INT | CTLFLAG_RW,
NULL, REDZONE_REALLOC_BIGGER_UNDERFLOW, redzone_sysctl, "I", "");
SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_bigger_overflow, CTLTYPE_INT | CTLFLAG_RW,
NULL, REDZONE_REALLOC_BIGGER_OVERFLOW, redzone_sysctl, "I", "");
static int
redzone_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
case MOD_UNLOAD:
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t redzone_module = {
"redzone",
redzone_modevent,
NULL
};
DECLARE_MODULE(redzone, redzone_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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