linux-stable.git/tools/testing/selftests/powerpc/security/mitigation-patching.sh, branch linux-5.15.y Linux kernel stable tree selftests/powerpc: Add test of mitigation patching 2021-05-17T05:27:47+00:00 Michael Ellerman mpe@ellerman.id.au 2021-05-07T06:42:25+00:00 34f7f79827ec4db30cff9001dfba19f496473e8d We recently discovered some of our mitigation patching was not safe against other CPUs running concurrently. Add a test which enable/disables all mitigations in a tight loop while also running some stress load. On an unpatched system this almost always leads to an oops and panic/reboot, but we also check if the kernel becomes tainted in case we have a non-fatal oops. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210507064225.1556312-1-mpe@ellerman.id.au 
We recently discovered some of our mitigation patching was not safe
against other CPUs running concurrently.

Add a test which enable/disables all mitigations in a tight loop while
also running some stress load. On an unpatched system this almost always
leads to an oops and panic/reboot, but we also check if the kernel
becomes tainted in case we have a non-fatal oops.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210507064225.1556312-1-mpe@ellerman.id.au