On Mon, Mar 14, 2022 at 08:57:49AM +0000, Catalin Marinas wrote: > On Tue, Mar 08, 2022 at 12:01:17PM -0600, Jeremy Linton wrote: > > > Resolve this by adding a sysctl abi.bti_main which causes the kernel to > > > checking the BTI property for the main executable and enable BTI if it > > > is present when doing the initial mapping. This sysctl is disabled by > > > default. > > This seems less than ideal, maybe the default can be flipped with a CONFIG > > option? > I'm not keen on config options changing the ABI. If there's a good > chance that this feature won't be turned on (via sysfs) in distros with > MDWE, I'd rather drop the whole series than maintain unused code in the > kernel. I think it's more just that it's a pain to have to also update userspace for something fairly low risk than that it's an insurmountable obstacle.
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