* Andy Lutomirski <l...@kernel.org> wrote:
> The modify_ldt syscall exposes a large attack surface and is
> unnecessary for modern userspace. Make it optional.
>
> Reviewed-by: Kees Cook <keesc...@chromium.org>
> Signed-off-by: Andy Lutomirski <l...@kernel.org>
> ---
> arch/x86/Kconfig | 17 +++++++++++++++++
> arch/x86/include/asm/mmu.h | 2 ++
> arch/x86/include/asm/mmu_context.h | 28 +++++++++++++++++++++-------
> arch/x86/kernel/Makefile | 3 ++-
> arch/x86/kernel/cpu/perf_event.c | 4 ++++
> arch/x86/kernel/process_64.c | 2 ++
> arch/x86/kernel/step.c | 2 ++
> kernel/sys_ni.c | 1 +
> 8 files changed, 51 insertions(+), 8 deletions(-)
btw., I fixed a (rare) build failure on MATH_EMULATION=y && !MODIFY_LDT_SYSCALL:
arch/x86/math-emu/fpu_system.h:21:71: error: ‘mm_context_t’ has no member
named ‘ldt’
I took the easy fix: made MATH_EMULATION depend on MODIFY_LDT_SYSCALL for now.
Thanks,
Ingo
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