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x86/vsyscall: Change the default vsyscall mode to xonly

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The use case for full emulation over xonly is very esoteric, e.g. magic
instrumentation tools.

Change the default to the safer xonly mode.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/30539f8072d2376b9c9efcc07e6ed0d6bf20e882.1561610354.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski 2019-06-26 21:45:07 -07:00 committed by Thomas Gleixner
parent b038697986
commit 625b7b7f79
1 changed files with 1 additions and 1 deletions
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arch/x86/Kconfig
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@ -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