Multiple TCP-based remote denial of service issues found in Linux and FreeBSD kernels:
@fribbledom How fun!
@fribbledom it is worse than DoS in my opinion. Kernel panic is like MS Windows BSOD.
@nergal @gudenau @fribbledom Not much anymore unless you build the kernel on your own (for Linux and BSDs). On Windows, different kernels are used for the client and server operating systems, albeit related.
Any system with a hw watchdog (and even my laptop has one) can be configured to use it, meaning that if the OS locks up, it stops tickling the watchdog and the watchdog will trigger a reboot, be it by NMI (non-maskable interrupt) or a lower level reset.
@gudenau @nergal @fribbledom Depends on hardware. Many systems offer options in firmware to disable protections such as parity checking and various (or all) processor external NMIs. Also, some processors even allow it in special registers.
The key is that “standard” masking will not work. The CLI/STI instructions have no effect on NMIs, for example.
Learned something new. How about that.
See https://en.m.wikipedia.org/wiki/Non-maskable_interrupt for more details.
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