x86/vsyscall: Remove CONFIG_LEGACY_VSYSCALL_EMULATE
CONFIG_LEGACY_VSYSCALL_EMULATE is, as far as I know, only needed for the
combined use of exotic and outdated debugging mechanisms with outdated
binaries. At this point, no one should be using it. We would like to
implement dynamic switching of vsyscalls, but this is much more
complicated to support in EMULATE mode than XONLY mode.
So let's force all the distros off of EMULATE mode. If anyone actually
needs it, they can set vsyscall=emulate, and we can then get away with
refusing to support newer security models if that option is set.
Cc: x86@kernel.org
Cc: Kees Cook <keescook@chromium.org>
Cc: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
2 files changed
