142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/*-
|
|
* 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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#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);
|