We need to check for vm86 mode first before looking at selector
privilege bits.
Segment limit is always base + 64k and only the low 16 bits of
EIP are significant in vm86 mode.
Signed-off-by: Chuck Ebbert <[email protected]>
--- 2.6.17-rc5-32.orig/arch/i386/mm/fault.c
+++ 2.6.17-rc5-32/arch/i386/mm/fault.c
@@ -77,12 +77,15 @@ static inline unsigned long get_segment_
unsigned seg = regs->xcs & 0xffff;
u32 seg_ar, seg_limit, base, *desc;
+ /* Unlikely, but must come before segment checks. */
+ if (unlikely(regs->eflags & VM_MASK)) {
+ base = seg << 4;
+ *eip_limit = base + 0xffff;
+ return base + (eip & 0xffff);
+ }
+
/* The standard kernel/user address space limit. */
*eip_limit = (seg & 3) ? USER_DS.seg : KERNEL_DS.seg;
-
- /* Unlikely, but must come before segment checks. */
- if (unlikely((regs->eflags & VM_MASK) != 0))
- return eip + (seg << 4);
/* By far the most common cases. */
if (likely(seg == __USER_CS || seg == __KERNEL_CS))
--
Chuck
-
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