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Date: Wed, 26 Jun 2019 21:45:07 -0700
From: Andy Lutomirski <>
Cc: LKML <>,
	Kees Cook <>,
	Florian Weimer <>,
	Jann Horn <>,
	Andy Lutomirski <>,
	Borislav Petkov <>,
	Kernel Hardening <>,
	Peter Zijlstra <>,
	Thomas Gleixner <>
Subject: [PATCH v2 6/8] x86/vsyscall: Change the default vsyscall mode to xonly

The use case for full emulation over xonly is very esoteric.  Let's
change the default to the safer xonly mode.

Cc: Kees Cook <>
Cc: Borislav Petkov <>
Cc: Kernel Hardening <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Signed-off-by: Andy Lutomirski <>
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0182d2c67590..32028edc1b0e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2285,7 +2285,7 @@ config COMPAT_VDSO
 	prompt "vsyscall table for legacy applications"
 	depends on X86_64
 	  Legacy user code that does not know how to find the vDSO expects
 	  to be able to issue three syscalls by calling fixed addresses in

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