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83f88df757
GCC and Clang allow us to inject a call to a function named __sanitizer_cov_trace_pc on every edge. This function has to be defined by us. By noting down the caller in that function we can trace the code we have encountered during execution. Such information is used by coverage guided fuzzers like AFL and LibFuzzer to determine if a new input resulted in a new code path. This makes fuzzing much more effective. Additionally this adds a basic KCOV implementation. KCOV is an API that allows user space to request the kernel to start collecting coverage information for a given user space thread. Furthermore KCOV then exposes the collected program counters to user space via a BlockDevice which can be mmaped from user space. This work is required to add effective support for fuzzing SerenityOS to the Syzkaller syscall fuzzer. :^) :^)
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Edwin Hoksberg <mail@edwinhoksberg.nl>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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struct winsize {
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unsigned short ws_row;
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unsigned short ws_col;
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unsigned short ws_xpixel;
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unsigned short ws_ypixel;
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};
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struct FBResolution {
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unsigned pitch;
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unsigned width;
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unsigned height;
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};
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struct FBRect {
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unsigned x;
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unsigned y;
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unsigned width;
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unsigned height;
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};
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struct FBBufferOffset {
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int buffer_index;
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unsigned offset;
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};
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struct FBFlushRects {
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int buffer_index;
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unsigned count;
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struct FBRect const* rects;
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};
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__END_DECLS
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enum IOCtlNumber {
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TIOCGPGRP,
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TIOCSPGRP,
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TCGETS,
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TCSETS,
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TCSETSW,
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TCSETSF,
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TCFLSH,
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TIOCGWINSZ,
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TIOCSCTTY,
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TIOCSTI,
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TIOCNOTTY,
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TIOCSWINSZ,
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FB_IOCTL_GET_SIZE_IN_BYTES,
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FB_IOCTL_GET_RESOLUTION,
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FB_IOCTL_SET_RESOLUTION,
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FB_IOCTL_GET_BUFFER,
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FB_IOCTL_GET_BUFFER_OFFSET,
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FB_IOCTL_SET_BUFFER,
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FB_IOCTL_FLUSH_BUFFERS,
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KEYBOARD_IOCTL_GET_NUM_LOCK,
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KEYBOARD_IOCTL_SET_NUM_LOCK,
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KEYBOARD_IOCTL_GET_CAPS_LOCK,
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KEYBOARD_IOCTL_SET_CAPS_LOCK,
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SIOCSIFADDR,
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SIOCGIFADDR,
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SIOCGIFHWADDR,
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SIOCGIFNETMASK,
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SIOCSIFNETMASK,
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SIOCGIFBRDADDR,
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SIOCGIFMTU,
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SIOCGIFFLAGS,
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SIOCGIFCONF,
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SIOCADDRT,
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SIOCDELRT,
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SIOCSARP,
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SIOCDARP,
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FIBMAP,
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FIONBIO,
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KCOV_SETBUFSIZE,
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KCOV_ENABLE,
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KCOV_DISABLE,
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};
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#define TIOCGPGRP TIOCGPGRP
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#define TIOCSPGRP TIOCSPGRP
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#define TCGETS TCGETS
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#define TCSETS TCSETS
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#define TCSETSW TCSETSW
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#define TCSETSF TCSETSF
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#define TCFLSH TCFLSH
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#define TIOCGWINSZ TIOCGWINSZ
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#define TIOCSCTTY TIOCSCTTY
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#define TIOCSTI TIOCSTI
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#define TIOCNOTTY TIOCNOTTY
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#define TIOCSWINSZ TIOCSWINSZ
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#define FB_IOCTL_GET_SIZE_IN_BYTES FB_IOCTL_GET_SIZE_IN_BYTES
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#define FB_IOCTL_GET_RESOLUTION FB_IOCTL_GET_RESOLUTION
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#define FB_IOCTL_SET_RESOLUTION FB_IOCTL_SET_RESOLUTION
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#define FB_IOCTL_GET_BUFFER FB_IOCTL_GET_BUFFER
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#define FB_IOCTL_GET_BUFFER_OFFSET FB_IOCTL_GET_BUFFER_OFFSET
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#define FB_IOCTL_SET_BUFFER FB_IOCTL_SET_BUFFER
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#define FB_IOCTL_FLUSH_BUFFERS FB_IOCTL_FLUSH_BUFFERS
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#define KEYBOARD_IOCTL_GET_NUM_LOCK KEYBOARD_IOCTL_GET_NUM_LOCK
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#define KEYBOARD_IOCTL_SET_NUM_LOCK KEYBOARD_IOCTL_SET_NUM_LOCK
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#define KEYBOARD_IOCTL_GET_CAPS_LOCK KEYBOARD_IOCTL_GET_CAPS_LOCK
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#define KEYBOARD_IOCTL_SET_CAPS_LOCK KEYBOARD_IOCTL_SET_CAPS_LOCK
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#define SIOCSIFADDR SIOCSIFADDR
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#define SIOCGIFADDR SIOCGIFADDR
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#define SIOCGIFHWADDR SIOCGIFHWADDR
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#define SIOCGIFNETMASK SIOCGIFNETMASK
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#define SIOCSIFNETMASK SIOCSIFNETMASK
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#define SIOCGIFBRDADDR SIOCGIFBRDADDR
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#define SIOCGIFMTU SIOCGIFMTU
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#define SIOCGIFFLAGS SIOCGIFFLAGS
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#define SIOCGIFCONF SIOCGIFCONF
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#define SIOCADDRT SIOCADDRT
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#define SIOCDELRT SIOCDELRT
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#define SIOCSARP SIOCSARP
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#define SIOCDARP SIOCDARP
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#define FIBMAP FIBMAP
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#define FIONBIO FIONBIO
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