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# Copyright 2020 syzkaller project authors. All rights reserved.
# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
# Common config fragments required by syzbot for all kernels
# CONFIG_DEBUG_MEMORY was once added to mm tree and cause disabling of KASAN,
# which in turn caused storm of assorted crashes after silent memory corruptions.
# The config was reverted, but we keep it here for the case it is reintroduced to kernel again.
# CONFIG_TWIST_KERNEL_BEHAVIOR can be used to prevent fuzzers from trying stupid things.
# See https://github.com/google/syzkaller/issues/1622 for details.
verbatim: |
CONFIG_DEBUG_MEMORY=y
CONFIG_TWIST_KERNEL_BEHAVIOR=y
CONFIG_TWIST_FOR_SYZKALLER_TESTING=y
config:
# Required to enable some other configs we set.
- EXPERT
- DEBUG_KERNEL
# panic=86400: prevents kernel from rebooting so that we don't get reboot output in all crash reports.
- CMDLINE: "earlyprintk=serial oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1 ima_policy=tcb kvm-intel.nested=1 nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 vivid.n_devs=16 vivid.multiplanar=1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2 netrom.nr_ndevs=16 rose.rose_ndevs=16 spec_store_bypass_disable=prctl numa=fake=2 nopcid dummy_hcd.num=8 binder.debug_mask=0 rcupdate.rcu_expedited=1"
# This config can be used to enable any additional temporal debugging features in linux-next tree.
- DEBUG_AID_FOR_SYZBOT: [linux-next]
# We don't need lots, but some configs set it to 2 which is too low.
- NR_CPUS: 8
# We slowdown execution significantly and there is no point in low latency under test.
- HZ_100
- RCU_TRACE: n
# KPROBES pollute coverage and needlessly slow down execution.
- KPROBES: n
# Slows down execution and sometimes fuzzer actually enables it.
- STACK_TRACER: n
- FUNCTION_TRACER: n
# Slows down execution.
- RETPOLINE: n
- PAGE_TABLE_ISOLATION: n
- LATENCYTOP: n
- SCHED_DEBUG: n
# Speeds up randomness initialization.
- HW_RANDOM
- HW_RANDOM_VIRTIO
- HW_RANDOM_INTEL: n
- HW_RANDOM_AMD: n
- HW_RANDOM_VIA: n
- RANDOM_TRUST_CPU: [-arm, -riscv]
- RANDOM_TRUST_BOOTLOADER
# For detection of supported syscalls
- KALLSYMS
- KALLSYMS_ALL
- KALLSYMS_BASE_RELATIVE
# For namespace sandbox.
- NAMESPACES
- USER_NS
- UTS_NS
# Depends on CONFIG_SYSVIPC.
- CONFIG_IPC_NS: [optional]
- PID_NS
- NET_NS
# Control groups are needed for better sandboxing of test processes.
- CGROUP_PIDS
- MEMCG
# Debugging features (from kernel_configs.md, do not alpha sort).
- DEBUG_BUGVERBOSE
- PANIC_ON_OOPS
- PANIC_TIMEOUT: 86400
- SCHED_STACK_END_CHECK
- FORTIFY_SOURCE: [-riscv]
- HARDENED_USERCOPY
- HARDENED_USERCOPY_FALLBACK
- BUG_ON_DATA_CORRUPTION
- DEBUG_LIST
# CONFIG_DEBUG_PI_LIST was renamed to CONFIG_DEBUG_PLIST in 8e18faeac3e4.
- DEBUG_PLIST: [v5.2]
- DEBUG_PI_LIST: [-v5.2]
# CONFIG_REFCOUNT_FULL was removed in fb041bb7c0a9.
- REFCOUNT_FULL: [-v5.5]
# This config does not add any debug checks (only debug output).
- DEBUG_KOBJECT: n
- DEBUG_INFO
- DEBUG_INFO_REDUCED
# BTF requires pahole (dwarves package on some distros) version 1.13,
# while syzbot distros only provide 1.9, this breaks kernel builds.
# See https://syzkaller.appspot.com/bug?id=cce16fbb0be2ed0c6f40459226202a8c06797536
# It depends on !CONFIG_DEBUG_INFO_REDUCED.
- DEBUG_INFO_BTF: n
# This should make behavior more deterministic.
- INIT_ON_ALLOC_DEFAULT_ON
# KCOV slows down execution too much with KASAN_HW_TAGS and in qemu emulation in general.
# KCOV crashes on Arm:
# https://lore.kernel.org/linux-arm-kernel/20210119130010.GA2338@C02TD0UTHF1T.local/T/#m78fdfcc41ae831f91c93ad5dabe63f7ccfb482f0
- KCOV: [-arm64, -arm]
- KCOV_INSTRUMENT_ALL: [-arm64, -arm]
- KCOV_ENABLE_COMPARISONS: [-arm64, -arm]
- DEBUG_FS
# Required for KCOV but also eliminates unnecessary non-determinism.
- RELOCATABLE: n
- RANDOMIZE_BASE: n
# Print thread and CPU ids.
- PRINTK_CALLER
- PRINTK_TIME
# Fault injection.
- FAULT_INJECTION
- FAILSLAB
- FAIL_PAGE_ALLOC
- FAIL_MAKE_REQUEST
- FAIL_IO_TIMEOUT
- FAIL_FUTEX
- FAULT_INJECTION_DEBUG_FS
- FAULT_INJECTION_USERCOPY: [v5.10]
# Options enabled to boot Debian Wheezy.
- DEVTMPFS
- DEVTMPFS_MOUNT
- INOTIFY_USER
- UEVENT_HELPER
- UEVENT_HELPER_PATH: "/sbin/hotplug"
# QEMU disk is usually on the generic PCI bus.
- PCI_HOST_GENERIC
- OF
# Options enabled to boot Debian Stretch.
- CONFIGFS_FS
- SECURITYFS
# If syzkaller gets to /dev/{mem,kmem,ioport}, it will destroy the machine.
# It managed to do so with some mount's, chdir's and bogus file names.
# These are not needed for fuzzing, so completely disabling them is
# the simplest and the most reliable option.
- DEVMEM: n
- DEVKMEM: n
- DEVPORT: n
# Disable magic SysRq completely, as it can be reached over USB and through tty.
- MAGIC_SYSRQ: n
- RUNTIME_TESTING_MENU: n
# Don't test/need this (may be enabled via HID_HYPERV_MOUSE in USB/HID configs).
- HYPERV: n
# These are legacy gadget drivers that we don't reach/test and some of these break boot:
# https://github.com/google/syzkaller/pull/1975#issuecomment-712807462
- USB_G_NCM: n
- USB_G_SERIAL: n
- USB_G_PRINTER: n
- USB_G_NOKIA: n
- USB_G_ACM_MS: n
- USB_G_MULTI: n
- USB_G_HID: n
- USB_G_DBGP: n
- USB_G_WEBCAM: n
- USB_ZERO: n
- USB_AUDIO: n
- USB_ETH: n
- USB_FUNCTIONFS: n
- USB_MASS_STORAGE: n
- USB_GADGET_TARGET: n
- USB_MIDI_GADGET: n
- USB_CDC_COMPOSITE: n
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