On Fri, Feb 05, 2021 at 10:50:32PM -0500, Sasha Levin wrote: > Right now if SUBLEVEL becomes larger than 255 it will overflow into the > territory of PATCHLEVEL, causing havoc in userspace that tests for > specific kernel version. > > While userspace code tests for MAJOR and PATCHLEVEL, it doesn't test > SUBLEVEL at any point as ABI changes don't happen in the context of > stable tree. > > Thus, to avoid overflows, simply clamp SUBLEVEL to it's maximum value in > the context of LINUX_VERSION_CODE. This does not affect "make > kernelversion" and such. > > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
