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Subject[PATCH 0/2] x86/mm/pkeys: fix user-visible pkey state destruction at fork()
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

Cc: Thomas Gleixner <>
Cc: Ingo Molnar <>
Cc: Borislav Petkov <>
Cc: "H. Peter Anvin" <>
Cc: Peter Zijlstra <>
Cc: Michael Ellerman <>
Cc: Will Deacon <>
Cc: Andy Lutomirski <>
Cc: Joerg Roedel <>

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