e6997d52de
This patch introduces GWP-ASan system properties and environment
variables to control the internal sampling rates of GWP-ASan. This can
be used for:
1. "Torture testing" the system, i.e. running it under an extremely
high sampling rate under GWP-ASan.
2. Increasing sampling remotely to allow further crash report
collection of rare issues.
There are three sets of system properites:
1. libc.debug.gwp_asan.*.system_default: Default values for native
executables and system apps.
2. libc.debug.gwp_asan.*.app_default: Default values for non-system
apps, and
3. libc.debug.gwp_asan.*.<basename/app_name>: Default values for an
individual app or native process.
There are three variables that can be changed:
1. The allocation sampling rate (default: 2500) - using the environment
variable GWP_ASAN_SAMPLE_RATE or the libc.debug.gwp_asan.sample_rate.*
system property.
2. The process sampling rate (default: 128 for system apps/processes, 1
for opted-in apps) - using the environment variable
GWP_ASAN_PROCESS_SAMPLING or the libc.debug.gwp_asan.process_sampling.*
system property,
3. The number of slots available (default: 32) - using the environment
variable GWP_ASAN_MAX_ALLOCS or the libc.debug.gwp_asan.max_allocs.*
system property.
If not specified, #3 will be calculated as a ratio of the default
|2500 SampleRate : 32 slots|. So, a sample rate of "1250" (i.e. twice as
frequent sampling) will result in a doubling of the max_allocs to "64".
Bug: 219651032
Test: atest bionic-unit-tests
Change-Id: Idb40a2a4d074e01ce3c4e635ad639a91a32d570f
76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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 "sysprop_helpers.h"
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#include <assert.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "sys/system_properties.h"
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static bool get_property_value(const char* property_name, char* dest, size_t dest_size) {
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assert(property_name && dest && dest_size != 0);
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const prop_info* prop = __system_property_find(property_name);
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if (!prop) return false;
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struct PropCbCookie {
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char* dest;
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size_t size;
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};
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*dest = '\0';
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PropCbCookie cb_cookie = {dest, dest_size};
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__system_property_read_callback(
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prop,
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[](void* cookie, const char* /* name */, const char* value, uint32_t /* serial */) {
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auto* cb_cookie = reinterpret_cast<PropCbCookie*>(cookie);
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strncpy(cb_cookie->dest, value, cb_cookie->size);
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},
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&cb_cookie);
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if (*dest != '\0' && *dest != '0') return true;
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return false;
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}
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bool get_config_from_env_or_sysprops(const char* env_var_name, const char* const* sys_prop_names,
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size_t sys_prop_names_size, char* options,
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size_t options_size) {
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const char* env = getenv(env_var_name);
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if (env && *env != '\0') {
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strncpy(options, env, options_size);
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options[options_size - 1] = '\0'; // Ensure null-termination.
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return true;
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}
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for (size_t i = 0; i < sys_prop_names_size; ++i) {
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if (sys_prop_names[i] == nullptr) continue;
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if (get_property_value(sys_prop_names[i], options, options_size)) return true;
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}
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return false;
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}
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