Hi x86 maintainers, This is an important fix that I believe needs to be merged for 4.21. Without it, applications calling fork() can potentially double-allocate a protection key, causing lots of strange problems.
Thomas's Reviewed-by is on the the actual fix, but not the selftest. I would also be happy to send this as a pull request if you would prefer. Cc: [email protected] Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Will Deacon <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: [email protected]
