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Editing: redzone.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);
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