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experimental x86 support for compcov in QEMU

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This commit is contained in:
Andrea Fioraldi
2019-07-19 00:55:41 +02:00
parent 5b2cb426be
commit 81dd1aea82
6 changed files with 320 additions and 10 deletions
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11
qemu_mode/patches/afl-qemu-cpu-inl.h
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@ -9,7 +9,8 @@
TCG instrumentation and block chaining support by Andrea Biondo
<andrea.biondo965@gmail.com>
QEMU 3.1.0 port and thread-safety by Andrea Fioraldi
QEMU 3.1.0 port, TCG thread-safety and CompareCoverage by Andrea Fioraldi
<andreafioraldi@gmail.com>
Copyright 2015, 2016, 2017 Google Inc. All rights reserved.
@ -65,6 +66,8 @@ abi_ulong afl_entry_point, /* ELF entry point (_start) */
afl_start_code, /* .text start pointer */
afl_end_code; /* .text end pointer */
u8 afl_enable_compcov;
/* Set in the child process in forkserver mode: */
static int forkserver_installed = 0;
@ -156,6 +159,12 @@ static void afl_setup(void) {
afl_end_code = (abi_ulong)-1;
}
if (getenv("AFL_QEMU_COMPCOV")) {
fprintf(stderr, "EEe\n");
afl_enable_compcov = 1;
}
/* pthread_atfork() seems somewhat broken in util/rcu.c, and I'm
not entirely sure what is the cause. This disables that