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142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/*-
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* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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SYSCTL_NODE(_debug, OID_AUTO, redzone, CTLFLAG_RW, 0, "");
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#define REDZONE_MALLOC_UNDERFLOW 0
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#define REDZONE_MALLOC_OVERFLOW 1
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#define REDZONE_REALLOC_SMALLER_UNDERFLOW 2
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#define REDZONE_REALLOC_SMALLER_OVERFLOW 3
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#define REDZONE_REALLOC_BIGGER_UNDERFLOW 4
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#define REDZONE_REALLOC_BIGGER_OVERFLOW 5
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static int
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redzone_sysctl(SYSCTL_HANDLER_ARGS)
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{
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u_char *p = NULL;
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int error, val = 0;
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error = sysctl_handle_int(oidp, &val, sizeof(val), req);
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if (error != 0 || req->newptr == NULL)
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return (0);
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switch (arg2) {
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case REDZONE_MALLOC_UNDERFLOW:
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p = malloc(10, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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p[-1] = '\0';
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break;
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case REDZONE_MALLOC_OVERFLOW:
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p = malloc(10, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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p[10] = '\0';
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break;
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case REDZONE_REALLOC_SMALLER_UNDERFLOW:
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p = malloc(8192, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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p[-1] = '\0';
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p = realloc(p, 10, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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break;
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case REDZONE_REALLOC_SMALLER_OVERFLOW:
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p = malloc(8192, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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p[8192] = '\0';
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p = realloc(p, 10, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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break;
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case REDZONE_REALLOC_BIGGER_UNDERFLOW:
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p = malloc(10, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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p[-1] = '\0';
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p = realloc(p, 8192, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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break;
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case REDZONE_REALLOC_BIGGER_OVERFLOW:
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p = malloc(10, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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p[10] = '\0';
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p = realloc(p, 8192, M_TEMP, M_NOWAIT);
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if (p == NULL)
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return (ENOMEM);
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break;
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}
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free(p, M_TEMP);
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return (0);
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}
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SYSCTL_PROC(_debug_redzone, OID_AUTO, malloc_underflow, CTLTYPE_INT | CTLFLAG_RW,
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NULL, REDZONE_MALLOC_UNDERFLOW, redzone_sysctl, "I", "");
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SYSCTL_PROC(_debug_redzone, OID_AUTO, malloc_overflow, CTLTYPE_INT | CTLFLAG_RW,
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NULL, REDZONE_MALLOC_OVERFLOW, redzone_sysctl, "I", "");
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SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_smaller_underflow, CTLTYPE_INT | CTLFLAG_RW,
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NULL, REDZONE_REALLOC_SMALLER_UNDERFLOW, redzone_sysctl, "I", "");
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SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_smaller_overflow, CTLTYPE_INT | CTLFLAG_RW,
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NULL, REDZONE_REALLOC_SMALLER_OVERFLOW, redzone_sysctl, "I", "");
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SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_bigger_underflow, CTLTYPE_INT | CTLFLAG_RW,
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NULL, REDZONE_REALLOC_BIGGER_UNDERFLOW, redzone_sysctl, "I", "");
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SYSCTL_PROC(_debug_redzone, OID_AUTO, realloc_bigger_overflow, CTLTYPE_INT | CTLFLAG_RW,
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NULL, REDZONE_REALLOC_BIGGER_OVERFLOW, redzone_sysctl, "I", "");
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static int
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redzone_modevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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case MOD_UNLOAD:
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t redzone_module = {
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"redzone",
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redzone_modevent,
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NULL
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};
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DECLARE_MODULE(redzone, redzone_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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