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f3ad684464
A process with CAP_SYS_NICE can bring kernel down by asking for too high SCHED_DEADLINE priority,
as the result rcu and other system services that use kernel threads will stop functioning.
Some parameters for SCHED_DEADLINE should be OK, but we don't have means to enforce
values of indirect syscall arguments. Peter Zijlstra proposed sysctl_deadline_period_{min,max}
which could be used to enfore safe limits without droppping CAP_SYS_NICE, but we don't have it yet.
See the following bug for details:
https://groups.google.com/forum/#!topic/syzkaller-bugs/G6Wl_PKPIWI
syzkaller - kernel fuzzer
syzkaller is an unsupervised coverage-guided kernel fuzzer.
Supported OSes: Akaros, FreeBSD, Fuchsia, gVisor, Linux, NetBSD, OpenBSD, Windows.
Mailing list: syzkaller@googlegroups.com (join on web or by email).
Found bugs: Akaros, Darwin/XNU, FreeBSD, Linux, NetBSD, OpenBSD, Windows.
Documentation
Initially, syzkaller was developed with Linux kernel fuzzing in mind, but now it's being extended to support other OS kernels as well. Most of the documentation at this moment is related to the Linux kernel. For other OS kernels check: Akaros, Darwin/XNU, FreeBSD, Fuchsia, NetBSD, OpenBSD, Windows, gVisor.
- How to install syzkaller
- How to use syzkaller
- How syzkaller works
- How to contribute to syzkaller
- How to report Linux kernel bugs
External Articles
- Research work based on syzkaller
- From HardenedLinux project:
- Kernel QA with syzkaller and qemu (tutorial on how to setup syzkaller with qemu)
- Syzkaller crash DEMO (tutorial on how to extend syzkaller with new syscalls)
- Kernel debug tool with syzkaller (debugging qemu VM created by syz-manager with gdb)
- Explanation of some syzkaller internals
- A example of fuzzing the ceph filesystem
- Coverage-guided kernel fuzzing with syzkaller (by David Drysdale)
- ubsan, kasan, syzkaller und co (video) (by Florian Westphal)
- Debugging a kernel crash found by syzkaller (by Quentin Casasnovas)
- Linux Plumbers 2016 talk slides
- syzkaller: the next gen kernel fuzzer (basics of operations, tutorial on how to run syzkaller and how to extend it to fuzz new drivers)
- syzbot and the tale of thousand kernel bugs [video]
Disclaimer
This is not an official Google product.