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114 lines
3.5 KiB
C
114 lines
3.5 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
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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 3.1.1 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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#ifndef __AFL_QEMU_COMMON
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#define __AFL_QEMU_COMMON
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#include "../../config.h"
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#ifndef CPU_NB_REGS
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#define AFL_REGS_NUM 1000
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#else
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#define AFL_REGS_NUM CPU_NB_REGS
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#endif
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/* NeverZero */
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#if (defined(__x86_64__) || defined(__i386__)) && defined(AFL_QEMU_NOT_ZERO)
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#define INC_AFL_AREA(loc) \
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asm volatile( \
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"incb (%0, %1, 1)\n" \
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"adcb $0, (%0, %1, 1)\n" \
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: /* no out */ \
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: "r"(afl_area_ptr), "r"(loc) \
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: "memory", "eax")
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#else
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#define INC_AFL_AREA(loc) afl_area_ptr[loc]++
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#endif
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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 abi_ulong afl_persistent_addr;
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extern abi_ulong afl_persistent_ret_addr;
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extern u8 afl_compcov_level;
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extern unsigned char afl_fork_child;
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extern unsigned char is_persistent;
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extern target_long persistent_stack_offset;
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extern unsigned char persistent_first_pass;
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extern unsigned char persistent_save_gpr;
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extern target_ulong persistent_saved_gpr[AFL_REGS_NUM];
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extern int persisent_retaddr_offset;
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extern __thread abi_ulong afl_prev_loc;
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void afl_debug_dump_saved_regs();
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void afl_persistent_loop();
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void tcg_gen_afl_call0(void *func);
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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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void tcg_gen_afl_maybe_log_call(target_ulong cur_loc);
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void afl_float_compcov_log_32(target_ulong cur_loc, float32 arg1, float32 arg2,
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void *status);
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void afl_float_compcov_log_64(target_ulong cur_loc, float64 arg1, float64 arg2,
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void *status);
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void afl_float_compcov_log_80(target_ulong cur_loc, floatx80 arg1,
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floatx80 arg2);
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/* Check if an address is valid in the current mapping */
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static inline int is_valid_addr(target_ulong addr) {
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int l, flags;
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target_ulong page;
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void * p;
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page = addr & TARGET_PAGE_MASK;
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l = (page + TARGET_PAGE_SIZE) - addr;
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flags = page_get_flags(page);
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if (!(flags & PAGE_VALID) || !(flags & PAGE_READ)) return 0;
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return 1;
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}
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#endif
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