diff options
| author | Juergen Gross <[email protected]> | 2015-08-06 10:04:38 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2015-08-08 10:20:45 +0200 |
| commit | 136d9d83c07c5e30ac49fc83b27e8c4842f108fc (patch) | |
| tree | 3b9647ce64436c09c784a923172a5d65cdc96403 | |
| parent | dd2384a75d1c046faf068a6352732a204814b86d (diff) | |
x86/ldt: Correct LDT access in single stepping logic
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 *.
Signed-off-by: Juergen Gross <[email protected]>
Reviewed-by: Andy Lutomirski <[email protected]>
Cc: <[email protected]> # On top of: 37868fe113ff: x86/ldt: Make modify_ldt synchronous
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | arch/x86/kernel/step.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/step.c b/arch/x86/kernel/step.c index 6273324186ac..0ccb53a9fcd9 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]; |