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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-07-27 08:42:32 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-28 14:26:26 +0200 |
| commit | 64f53a0492b4bc11868307990bb8f7c1e0764f89 (patch) | |
| tree | 60348b0c26e945e2b91da2521af5b300979cdc04 | |
| parent | b56afe1d41653fb07ab1b5af5ccc12001c4dd5a0 (diff) | |
| download | blackbird-op-linux-64f53a0492b4bc11868307990bb8f7c1e0764f89.tar.gz blackbird-op-linux-64f53a0492b4bc11868307990bb8f7c1e0764f89.zip | |
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>
| -rw-r--r-- | include/asm-x86/desc.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h index 24a524f5e1a2..06f786f4b4fb 100644 --- a/include/asm-x86/desc.h +++ b/include/asm-x86/desc.h @@ -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; |
