[PATCH] Selftests/powerpc: Add a signal fuzzer selftest

[Michael Ellerman]

On Thu, 2019-01-17 at 17:01:54 UTC, Breno Leitao wrote:
> This is a new selftest that raises SIGUSR1 signals and handles it in a set
> of different ways, trying to create different scenario for testing
> purpose.
> 
> This test works raising a signal and calling sigreturn interleaved with
> TM operations, as starting, suspending and terminating a transaction. The
> test depends on random numbers, and, based on them, it sets different TM
> states.
> 
> Other than that, the test fills out the user context struct that is passed
> to the sigreturn system call with random data, in order to make sure that
> the signal handler syscall can handle different and invalid states
> properly.
> 
> This selftest has command line parameters to control what kind of tests the
> user wants to run, as for example, if a transaction should be started prior
> to signal being raised, or, after the signal being raised and before the
> sigreturn. If no parameter is given, the default is enabling all options.
> 
> This test does not check if the user context is being read and set
> properly by the kernel. Its purpose, at this time, is basically
> guaranteeing that the kernel does not crash on invalid scenarios.
> 
> Signed-off-by: Breno Leitao <leitao at debian.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/83e367f9ad18d42a1883ee29f20608a2

cheers