Commit 66fcd988 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Borislav Petkov
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x86/fault: Don't look for extable entries for SMEP violations 



If the kernel gets a SMEP violation or a fault that would have been a
SMEP violation if it had SMEP support, it shouldn't run fixups. Just
OOPS.

 [ bp: Massage commit message. ]

Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/46160d8babce2abf1d6daa052146002efa24ac56.1612924255.git.luto@kernel.org
parent 6456a2a6

arch/x86/mm/fault.c

+2 −2
Original line number Diff line number Diff line
@@ -1250,12 +1250,12 @@ void do_user_addr_fault(struct pt_regs *regs, 
		 * user memory.  Unless this is AMD erratum #93, which

		 * corrupts RIP such that it looks like a user address,

		 * this is unrecoverable.  Don't even try to look up the

		 * VMA.

		 * VMA or look for extable entries.

		 */

		if (is_errata93(regs, address))

			return;



		bad_area_nosemaphore(regs, error_code, address);

		page_fault_oops(regs, error_code, address);

		return;

	}