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Message-ID: <488C9768.8090000@goop.org> Date: Sun, 27 Jul 2008 08:42:32 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Ingo Molnar <mingo@...e.hu> CC: the arch/x86 maintainers <x86@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Glauber de Oliveira Costa <gcosta@...hat.com> Subject: [PATCH] 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@...rix.com> Cc: Glauber de Oliveira Costa <gcosta@...hat.com> --- include/asm-x86/desc.h | 5 +++++ 1 file changed, 5 insertions(+) diff -r c79984cfb996 include/asm-x86/desc.h --- a/include/asm-x86/desc.h Fri Jul 25 16:09:12 2008 -0700 +++ b/include/asm-x86/desc.h Sun Jul 27 08:31:08 2008 -0700 @@ -24,6 +24,9 @@ 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 anyways + because 64bit system calls require __USER_CS. */ + desc->l = 0; } extern struct desc_ptr idt_descr; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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