147 lines
6.8 KiB
C
147 lines
6.8 KiB
C
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/*
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* Copyright (c) 2019 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <pexpert/pexpert.h>
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#include <kern/kalloc.h>
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#include <kern/percpu.h>
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#include <prng/entropy.h>
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#include <libkern/section_keywords.h>
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SYSCTL_NODE(_kern, OID_AUTO, entropy, CTLFLAG_RD, 0, NULL);
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SYSCTL_NODE(_kern_entropy, OID_AUTO, health, CTLFLAG_RD, 0, NULL);
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SYSCTL_INT(_kern_entropy_health, OID_AUTO, startup_done, CTLFLAG_RD, &entropy_health_startup_done, 0, NULL);
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SYSCTL_NODE(_kern_entropy_health, OID_AUTO, repetition_count_test, CTLFLAG_RD, 0, NULL);
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SYSCTL_UINT(_kern_entropy_health_repetition_count_test, OID_AUTO, reset_count, CTLFLAG_RD, &entropy_health_rct_stats.reset_count, 0, NULL);
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SYSCTL_UINT(_kern_entropy_health_repetition_count_test, OID_AUTO, failure_count, CTLFLAG_RD, &entropy_health_rct_stats.failure_count, 0, NULL);
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SYSCTL_UINT(_kern_entropy_health_repetition_count_test, OID_AUTO, max_observation_count, CTLFLAG_RD, &entropy_health_rct_stats.max_observation_count, 0, NULL);
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SYSCTL_NODE(_kern_entropy_health, OID_AUTO, adaptive_proportion_test, CTLFLAG_RD, 0, NULL);
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SYSCTL_UINT(_kern_entropy_health_adaptive_proportion_test, OID_AUTO, reset_count, CTLFLAG_RD, &entropy_health_apt_stats.reset_count, 0, NULL);
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SYSCTL_UINT(_kern_entropy_health_adaptive_proportion_test, OID_AUTO, failure_count, CTLFLAG_RD, &entropy_health_apt_stats.failure_count, 0, NULL);
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SYSCTL_UINT(_kern_entropy_health_adaptive_proportion_test, OID_AUTO, max_observation_count, CTLFLAG_RD, &entropy_health_apt_stats.max_observation_count, 0, NULL);
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SYSCTL_NODE(_kern_entropy, OID_AUTO, filter, CTLFLAG_RD, 0,
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"Entropy filter information");
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SYSCTL_QUAD(_kern_entropy_filter, OID_AUTO, total_sample_count, CTLFLAG_RD, &entropy_filter_total_sample_count,
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"The total number of samples processed (i.e. the number of interrupts)");
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SYSCTL_QUAD(_kern_entropy_filter, OID_AUTO, accepted_sample_count, CTLFLAG_RD, &entropy_filter_accepted_sample_count,
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"The number of samples that passed the filter");
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SYSCTL_QUAD(_kern_entropy_filter, OID_AUTO, rejected_sample_count, CTLFLAG_RD, &entropy_filter_rejected_sample_count,
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"The number of samples that were rejected by the filters");
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SYSCTL_NODE(_kern_entropy, OID_AUTO, analysis, CTLFLAG_RD, 0,
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"Subsystem to collect entropy samples for offline analysis");
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static int entropy_analysis_supported = ENTROPY_ANALYSIS_SUPPORTED;
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SYSCTL_INT(_kern_entropy_analysis, OID_AUTO, supported, CTLFLAG_RD, &entropy_analysis_supported, 0,
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"1 if the kernel was built with entropy analysis support; 0 otherwise");
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#if ENTROPY_ANALYSIS_SUPPORTED
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SYSCTL_INT(_kern_entropy_analysis, OID_AUTO, enabled, CTLFLAG_RD, &entropy_analysis_enabled, 0,
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"1 if entropy analysis is enabled (via boot arg); 0 otherwise");
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SYSCTL_UINT(_kern_entropy_analysis, OID_AUTO, max_sample_count, CTLFLAG_RD | CTLFLAG_NOAUTO, &entropy_analysis_max_sample_count, 0,
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"Target count of samples to be collected");
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SYSCTL_UINT(_kern_entropy_analysis, OID_AUTO, sample_count, CTLFLAG_RD | CTLFLAG_NOAUTO, &entropy_analysis_sample_count, 0,
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"Current count of samples collected");
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static int entropy_analysis_sample_size = sizeof(entropy_sample_t);
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SYSCTL_UINT(_kern_entropy_analysis, OID_AUTO, sample_size, CTLFLAG_RD | CTLFLAG_NOAUTO, &entropy_analysis_sample_size, 0,
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"Size (in bytes) of a single sample");
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SYSCTL_UINT(_kern_entropy_analysis, OID_AUTO, buffer_size, CTLFLAG_RD | CTLFLAG_NOAUTO, &entropy_analysis_buffer_size, 0,
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"Size (in bytes) of the buffer of samples");
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SYSCTL_UINT(_kern_entropy_analysis, OID_AUTO, filter_size, CTLFLAG_RD | CTLFLAG_NOAUTO, &entropy_analysis_filter_size, 0,
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"Size (in bytes) of the filter bitmap");
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static int
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sysctl_entropy_collect SYSCTL_HANDLER_ARGS
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{
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if (req->oldptr == USER_ADDR_NULL) {
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return SYSCTL_OUT(req, NULL, entropy_analysis_buffer_size);
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}
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return SYSCTL_OUT(req, entropy_analysis_buffer, entropy_analysis_buffer_size);
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}
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SYSCTL_PROC(_kern_entropy_analysis, OID_AUTO, buffer,
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CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NOAUTO,
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NULL, 0, sysctl_entropy_collect, "-",
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"The buffer of samples");
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static int
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sysctl_entropy_filter SYSCTL_HANDLER_ARGS
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{
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if (req->oldptr == USER_ADDR_NULL) {
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return SYSCTL_OUT(req, NULL, entropy_analysis_filter_size);
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}
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// There is one bit in the bitmap for each sample.
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unsigned filter_nbits = entropy_analysis_max_sample_count;
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bitmap_t *filter = bitmap_alloc(filter_nbits);
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if (!filter) {
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return ENOMEM;
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}
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entropy_filter(entropy_analysis_max_sample_count, entropy_analysis_buffer, BITMAP_LEN(filter_nbits), filter);
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int status = SYSCTL_OUT(req, filter, entropy_analysis_filter_size);
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bitmap_free(filter, filter_nbits);
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return status;
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}
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SYSCTL_PROC(_kern_entropy_analysis, OID_AUTO, filter,
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CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NOAUTO,
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NULL, 0, sysctl_entropy_filter, "-",
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"The bitmap of filtered samples");
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__startup_func
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static void
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entropy_analysis_sysctl_startup(void)
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{
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uint32_t sample_count = 0;
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if (__improbable(PE_parse_boot_argn(ENTROPY_ANALYSIS_BOOTARG, &sample_count, sizeof(sample_count)))) {
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sysctl_register_oid_early(&sysctl__kern_entropy_analysis_max_sample_count);
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sysctl_register_oid_early(&sysctl__kern_entropy_analysis_sample_count);
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sysctl_register_oid_early(&sysctl__kern_entropy_analysis_sample_size);
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sysctl_register_oid_early(&sysctl__kern_entropy_analysis_buffer_size);
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sysctl_register_oid_early(&sysctl__kern_entropy_analysis_buffer);
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sysctl_register_oid_early(&sysctl__kern_entropy_analysis_filter_size);
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sysctl_register_oid_early(&sysctl__kern_entropy_analysis_filter);
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}
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}
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STARTUP(SYSCTL, STARTUP_RANK_MIDDLE, entropy_analysis_sysctl_startup);
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#endif // ENTROPY_ANALYSIS_SUPPORTED
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