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019132ff3d
This fills in the new siginfo field: si_pkey to indicate to userspace which protection key was set on the PTE that we faulted on. Note though that *ALL* protection key faults have to be generated by a valid, present PTE at some point. But this code does no PTE lookups which seeds odd. The reason is that we take advantage of the way we generate PTEs from VMAs. All PTEs under a VMA share some attributes. For instance, they are _all_ either PROT_READ *OR* PROT_NONE. They also always share a protection key, so we never have to walk the page tables; we just use the VMA. Note that _pkey is a 64-bit value. The current hardware only supports 4-bit protection keys. We do this because there is _plenty_ of space in _sigfault and it is possible that future processors would support more than 4 bits of protection keys. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave@sr71.net> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20160212210213.ABC488FA@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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