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Date: Wed, 26 Jun 2019 21:45:07 -0700
From: Andy Lutomirski <luto@...nel.org>
To: x86@...nel.org
Cc: LKML <linux-kernel@...r.kernel.org>,
Kees Cook <keescook@...omium.org>,
Florian Weimer <fweimer@...hat.com>,
Jann Horn <jannh@...gle.com>,
Andy Lutomirski <luto@...nel.org>,
Borislav Petkov <bp@...en8.de>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>
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 <keescook@...omium.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
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
choice
prompt "vsyscall table for legacy applications"
depends on X86_64
- default LEGACY_VSYSCALL_EMULATE
+ default LEGACY_VSYSCALL_XONLY
help
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
--
2.21.0
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