Commit 37868fe113ff ("x86/ldt: Make modify_ldt synchronous") introduced
a new struct ldt_struct anchored at mm->context.ldt.
convert_ip_to_linear() was changed to reflect this, but indexing into
the ldt has to be changed as the pointer is no longer void *.
Cc: <stable@xxxxxxxxxxxxxxx> # 37868fe113ff: x86/ldt: Make modify_ldt synchronous
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
arch/x86/kernel/step.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/step.c b/arch/x86/kernel/step.c
index 6273324..0ccb53a 100644
--- a/arch/x86/kernel/step.c
+++ b/arch/x86/kernel/step.c
@@ -28,11 +28,11 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re
struct desc_struct *desc;
unsigned long base;
- seg &= ~7UL;
+ seg >>= 3;
mutex_lock(&child->mm->context.lock);
if (unlikely(!child->mm->context.ldt ||
- (seg >> 3) >= child->mm->context.ldt->size))
+ seg >= child->mm->context.ldt->size))
addr = -1L; /* bogus selector, access would fault */
else {
desc = &child->mm->context.ldt->entries[seg];
--
2.1.4
--
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