1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2023-2025 Ruslan Bukin <br@bsdpad.com> 5 * 6 * This work was supported by Innovate UK project 105694, "Digital Security 7 * by Design (DSbD) Technology Platform Prototype". 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 #include <sys/proc.h> 33 #include <sys/kernel.h> 34 #include <sys/malloc.h> 35 #include <sys/mutex.h> 36 #include <sys/lock.h> 37 #include <sys/hwt.h> 38 39 #include <vm/vm.h> 40 41 #include <dev/hwt/hwt_hook.h> 42 #include <dev/hwt/hwt_context.h> 43 #include <dev/hwt/hwt_contexthash.h> 44 #include <dev/hwt/hwt_config.h> 45 #include <dev/hwt/hwt_thread.h> 46 #include <dev/hwt/hwt_record.h> 47 48 #define HWT_MAXCONFIGSIZE PAGE_SIZE 49 50 #define HWT_CONFIG_DEBUG 51 #undef HWT_CONFIG_DEBUG 52 53 #ifdef HWT_CONFIG_DEBUG 54 #define dprintf(fmt, ...) printf(fmt, ##__VA_ARGS__) 55 #else 56 #define dprintf(fmt, ...) 57 #endif 58 59 static MALLOC_DEFINE(M_HWT_CONFIG, "hwt_config", "HWT config"); 60 61 int 62 hwt_config_set(struct thread *td, struct hwt_context *ctx, 63 struct hwt_set_config *sconf) 64 { 65 size_t config_size; 66 void *old_config; 67 void *config; 68 int error; 69 70 config_size = sconf->config_size; 71 if (config_size == 0) 72 return (0); 73 74 if (config_size > HWT_MAXCONFIGSIZE) 75 return (EFBIG); 76 77 config = malloc(config_size, M_HWT_CONFIG, M_WAITOK | M_ZERO); 78 79 error = copyin(sconf->config, config, config_size); 80 if (error) { 81 free(config, M_HWT_CONFIG); 82 return (error); 83 } 84 85 HWT_CTX_LOCK(ctx); 86 old_config = ctx->config; 87 ctx->config = config; 88 ctx->config_size = sconf->config_size; 89 ctx->config_version = sconf->config_version; 90 HWT_CTX_UNLOCK(ctx); 91 92 if (old_config != NULL) 93 free(old_config, M_HWT_CONFIG); 94 95 return (error); 96 } 97 98 void 99 hwt_config_free(struct hwt_context *ctx) 100 { 101 102 if (ctx->config == NULL) 103 return; 104 105 free(ctx->config, M_HWT_CONFIG); 106 107 ctx->config = NULL; 108 } 109