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158 lines
5.4 KiB
C
158 lines
5.4 KiB
C
/*
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american fuzzy lop++ - high-performance binary-only instrumentation
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-------------------------------------------------------------------
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Originally written by Andrew Griffiths <agriffiths@google.com> and
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Michal Zalewski <lcamtuf@google.com>
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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, CompareCoverage and NeverZero
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counters by Andrea Fioraldi <andreafioraldi@gmail.com>
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Copyright 2015, 2016, 2017 Google Inc. All rights reserved.
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Copyright 2019 AFLplusplus Project. 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 "afl-qemu-common.h"
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#include "tcg.h"
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#include "tcg-op.h"
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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)) { INC_AFL_AREA(cur_loc); }
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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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INC_AFL_AREA(cur_loc);
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if ((arg1 & 0xffff) == (arg2 & 0xffff)) {
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INC_AFL_AREA(cur_loc + 1);
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if ((arg1 & 0xffffff) == (arg2 & 0xffffff)) { INC_AFL_AREA(cur_loc + 2); }
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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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INC_AFL_AREA(cur_loc);
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if ((arg1 & 0xffff) == (arg2 & 0xffff)) {
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INC_AFL_AREA(cur_loc + 1);
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if ((arg1 & 0xffffff) == (arg2 & 0xffffff)) {
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INC_AFL_AREA(cur_loc + 2);
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if ((arg1 & 0xffffffff) == (arg2 & 0xffffffff)) {
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INC_AFL_AREA(cur_loc + 3);
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if ((arg1 & 0xffffffffff) == (arg2 & 0xffffffffff)) {
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INC_AFL_AREA(cur_loc + 4);
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if ((arg1 & 0xffffffffffff) == (arg2 & 0xffffffffffff)) {
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INC_AFL_AREA(cur_loc + 5);
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if ((arg1 & 0xffffffffffffff) == (arg2 & 0xffffffffffffff)) {
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INC_AFL_AREA(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, int is_imm) {
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void *func;
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if (!afl_compcov_level || cur_loc > afl_end_code || cur_loc < afl_start_code)
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return;
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if (!is_imm && afl_compcov_level < 2) return;
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switch (ot) {
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case MO_64: func = &afl_compcov_log_64; break;
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case MO_32: func = &afl_compcov_log_32; break;
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case MO_16: func = &afl_compcov_log_16; break;
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default: 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 - 7;
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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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#define AFL_QEMU_TARGET_i386_SNIPPET \
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if (is_persistent) { \
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\
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if (s->pc == afl_persistent_addr) { \
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\
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if (afl_persistent_ret_addr == 0) { \
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\
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TCGv_ptr stack_off_ptr = tcg_const_ptr(&persistent_stack_offset); \
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TCGv stack_off = tcg_temp_new(); \
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tcg_gen_ld_tl(stack_off, stack_off_ptr, 0); \
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tcg_gen_sub_tl(cpu_regs[R_ESP], cpu_regs[R_ESP], stack_off); \
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tcg_temp_free(stack_off); \
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\
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} \
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TCGv_ptr paddr = tcg_const_ptr(afl_persistent_addr); \
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tcg_gen_st_tl(paddr, cpu_regs[R_ESP], 0); \
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tcg_gen_afl_call0(&afl_persistent_loop); \
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\
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} else if (afl_persistent_ret_addr && s->pc == afl_persistent_ret_addr) { \
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\
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gen_jmp_im(s, afl_persistent_addr); \
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gen_eob(s); \
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\
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} \
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\
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}
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