| Message ID | 30539f8072d2376b9c9efcc07e6ed0d6bf20e882.1561610354.git.luto@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/8] x86/vsyscall: Remove the vsyscall=native documentation | expand |
On Wed, Jun 26, 2019 at 09:45:07PM -0700, Andy Lutomirski wrote: > 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@chromium.org> > Cc: Borislav Petkov <bp@alien8.de> > Cc: Kernel Hardening <kernel-hardening@lists.openwall.com> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Thomas Gleixner <tglx@linutronix.de> > Signed-off-by: Andy Lutomirski <luto@kernel.org> I still think it'd be valuable to describe any known esoteric cases here, but regardless: Reviewed-by: Kees Cook <keescook@chromium.org> -Kees > --- > 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 >
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
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@chromium.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Kernel Hardening <kernel-hardening@lists.openwall.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)