Commit 64f53a04 authored Jul 27, 2008 by Jeremy Fitzhardinge Committed by Ingo Molnar Jul 28, 2008

x86: fix initialization of 'l' bit in ldt descriptors



Make sure that fill_ldt() initializes the 'l' bit in the descriptor.
It always sets it to 0, ignoring 'lm' in user_desc, preserving original
x86_64 behaviour.

Previously it was leaving 'l' uninitialized.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Glauber de Oliveira Costa <gcosta@redhat.com>

parent b56afe1d

include/asm-x86/desc.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,11 @@ static inline void fill_ldt(struct desc_struct *desc,
		desc->d = info->seg_32bit;
		desc->g = info->limit_in_pages;
		desc->base2 = (info->base_addr & 0xff000000) >> 24;
		/*
		* Don't allow setting of the lm bit. It is useless anyway
		* because 64bit system calls require __USER_CS:
		*/
		desc->l = 0;
		}

		extern struct desc_ptr idt_descr;