On Tue, Feb 25, 2025 at 02:26:50PM -0800, Jeff Xu wrote: > On Mon, Feb 24, 2025 at 10:20 PM Lorenzo Stoakes > <lorenzo.stoakes@xxxxxxxxxx> wrote: > > > > On Mon, Feb 24, 2025 at 10:52:43PM +0000, jeffxu@xxxxxxxxxxxx wrote: > > > From: Jeff Xu <jeffxu@xxxxxxxxxxxx> > > > > > > Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on arm64, covering > > > the vdso, vvar, and compat-mode vectors and sigpage mappings. > > > > > > Production release testing passes on Android and Chrome OS. > > > > This is pretty limited (yes yes I know android is massive etc. but we must > > account for all the weird and wonderful arm64 devices out there in context of > > upstream :) > > > > Have you looking through all arm64-code relating to vdso, vvar, compat-mode > > vectors, sigpage mapping and ensured nothing kernel-side relies upon relocation? > > Some arches actually seem to want to do this. Pretty sure PPC does... so a bit > > nervous of that. > > > Can you please point out where PPC munmap/mremap the vdso ? > > Previously, when you mentioned that, I thought you meant user space in > PPC, I didn't realize that you meant that kernel code in PPC. I > tried, but didn't find anything, hence asking. Jeff, please stick to replying to review. 'Have you looking through all arm64-code'. I ended up doing this myself yesterday and found no issues, as with x86-64. I said I'm _pretty sure_ PPC does this. Liam mentioned something about it. We can discuss it, and I can find specifics if + when you try to add this to PPC. Please try to respect my time... > > Thanks. > -Jeff
