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126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
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american fuzzy lop - high-performance binary-only instrumentation
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-----------------------------------------------------------------
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Written by Andrew Griffiths <agriffiths@google.com> and
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Michal Zalewski <lcamtuf@google.com>
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Idea & design very much by Andrew Griffiths.
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TCG instrumentation and block chaining support by Andrea Biondo
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<andrea.biondo965@gmail.com>
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QEMU 3.1.0 port, TCG thread-safety and CompareCoverage by Andrea Fioraldi
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<andreafioraldi@gmail.com>
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Copyright 2015, 2016, 2017 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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http://www.apache.org/licenses/LICENSE-2.0
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This code is a shim patched into the separately-distributed source
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code of QEMU 3.1.0. It leverages the built-in QEMU tracing functionality
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to implement AFL-style instrumentation and to take care of the remaining
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parts of the AFL fork server logic.
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The resulting QEMU binary is essentially a standalone instrumentation
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tool; for an example of how to leverage it for other purposes, you can
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have a look at afl-showmap.c.
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*/
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#include "../../config.h"
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#include "tcg.h"
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#include "tcg-op.h"
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/* Declared in afl-qemu-cpu-inl.h */
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extern unsigned char *afl_area_ptr;
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extern unsigned int afl_inst_rms;
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extern abi_ulong afl_start_code, afl_end_code;
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extern u8 afl_enable_compcov;
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void tcg_gen_afl_compcov_log_call(void *func, target_ulong cur_loc,
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TCGv_i64 arg1, TCGv_i64 arg2);
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static void afl_compcov_log_16(target_ulong cur_loc, target_ulong arg1,
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target_ulong arg2) {
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if ((arg1 & 0xff) == (arg2 & 0xff)) {
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afl_area_ptr[cur_loc]++;
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}
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}
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static void afl_compcov_log_32(target_ulong cur_loc, target_ulong arg1,
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target_ulong arg2) {
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if ((arg1 & 0xff) == (arg2 & 0xff)) {
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afl_area_ptr[cur_loc]++;
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if ((arg1 & 0xffff) == (arg2 & 0xffff)) {
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afl_area_ptr[cur_loc +1]++;
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if ((arg1 & 0xffffff) == (arg2 & 0xffffff)) {
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afl_area_ptr[cur_loc +2]++;
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}
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}
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}
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}
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static void afl_compcov_log_64(target_ulong cur_loc, target_ulong arg1,
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target_ulong arg2) {
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if ((arg1 & 0xff) == (arg2 & 0xff)) {
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afl_area_ptr[cur_loc]++;
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if ((arg1 & 0xffff) == (arg2 & 0xffff)) {
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afl_area_ptr[cur_loc +1]++;
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if ((arg1 & 0xffffff) == (arg2 & 0xffffff)) {
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afl_area_ptr[cur_loc +2]++;
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if ((arg1 & 0xffffffff) == (arg2 & 0xffffffff)) {
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afl_area_ptr[cur_loc +3]++;
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if ((arg1 & 0xffffffff) == (arg2 & 0xffffffffff)) {
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afl_area_ptr[cur_loc +4]++;
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if ((arg1 & 0xffffffff) == (arg2 & 0xffffffffffff)) {
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afl_area_ptr[cur_loc +5]++;
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if ((arg1 & 0xffffffff) == (arg2 & 0xffffffffffffff)) {
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afl_area_ptr[cur_loc +6]++;
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}
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}
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}
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}
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}
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}
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}
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}
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static void afl_gen_compcov(target_ulong cur_loc, TCGv_i64 arg1, TCGv_i64 arg2,
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TCGMemOp ot) {
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void *func;
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if (!afl_enable_compcov || cur_loc > afl_end_code || cur_loc < afl_start_code)
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return;
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switch (ot) {
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case MO_64:
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func = &afl_compcov_log_64;
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break;
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case MO_32:
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func = &afl_compcov_log_32;
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break;
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case MO_16:
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func = &afl_compcov_log_16;
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break;
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default:
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return;
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}
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cur_loc = (cur_loc >> 4) ^ (cur_loc << 8);
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cur_loc &= MAP_SIZE - 1;
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if (cur_loc >= afl_inst_rms) return;
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tcg_gen_afl_compcov_log_call(func, cur_loc, arg1, arg2);
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}
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