Commit-ID: 136d9d83c07c5e30ac49fc83b27e8c4842f108fc
Gitweb: http://git.kernel.org/tip/136d9d83c07c5e30ac49fc83b27e8c4842f108fc
Author: Juergen Gross <jgr...@suse.com>
AuthorDate: Thu, 6 Aug 2015 10:04:38 +0200
Committer: Ingo Molnar <mi...@kernel.org>
CommitDate: Sat, 8 Aug 2015 10:20:45 +0200
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 <jgr...@suse.com>
Reviewed-by: Andy Lutomirski <l...@kernel.org>
Cc: <sta...@vger.kernel.org> # On top of: 37868fe113ff: x86/ldt: Make
modify_ldt synchronous
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: b...@suse.de
Link: http://lkml.kernel.org/r/1438848278-12906-1-git-send-email-jgr...@suse.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
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];
--
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