x86, ds: add leakage warning

Add a warning in case a debug store context is not removed before
the task it is attached to is freed.

Remove the old warning at thread exit. It is too early.

Declare the debug store context field in thread_struct unconditionally.

Remove ds_copy_thread() and ds_exit_thread() and do the work directly
in process*.c.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: oleg@redhat.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144601.254472000@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

6 files changed, 8 insertions, 26 deletions

diff --git a/arch/x86/include/asm/ds.h b/arch/x86/include/asm/ds.h
index 413e127e567..149e5208e96 100644
--- a/arch/x86/include/asm/ds.h
+++ b/arch/x86/include/asm/ds.h
@@ -285,21 +285,12 @@ extern void __cpuinit ds_init_intel(struct cpuinfo_x86 *);
  */
 extern void ds_switch_to(struct task_struct *prev, struct task_struct *next);
 
-/*
- * Task clone/init and cleanup work
- */
-extern void ds_copy_thread(struct task_struct *tsk, struct task_struct *father);
-extern void ds_exit_thread(struct task_struct *tsk);
-
 #else /* CONFIG_X86_DS */
 
 struct cpuinfo_x86;
 static inline void __cpuinit ds_init_intel(struct cpuinfo_x86 *ignored) {}
 static inline void ds_switch_to(struct task_struct *prev,
                                 struct task_struct *next) {}
-static inline void ds_copy_thread(struct task_struct *tsk,
-                                  struct task_struct *father) {}
-static inline void ds_exit_thread(struct task_struct *tsk) {}
 
 #endif /* CONFIG_X86_DS */
 #endif /* _ASM_X86_DS_H */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 1efeb497f1f..7c39de7e709 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -454,10 +454,8 @@ struct thread_struct {
         unsigned                io_bitmap_max;
 /* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set.  */
         unsigned long   debugctlmsr;
-#ifdef CONFIG_X86_DS
-/* Debug Store context; see include/asm-x86/ds.h; goes into MSR_IA32_DS_AREA */
+        /* Debug Store context; see asm/ds.h */
         struct ds_context       *ds_ctx;
-#endif /* CONFIG_X86_DS */
 };
 
 static inline unsigned long native_get_debugreg(int regno)
diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 21a3852abf6..71cab3b62dc 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -1352,16 +1352,6 @@ void ds_switch_to(struct task_struct *prev, struct task_struct *next)
         update_debugctlmsr(debugctlmsr);
 }
 
-void ds_copy_thread(struct task_struct *tsk, struct task_struct *father)
-{
-        clear_tsk_thread_flag(tsk, TIF_DS_AREA_MSR);
-        tsk->thread.ds_ctx = NULL;
-}
-
-void ds_exit_thread(struct task_struct *tsk)
-{
-}
-
 static __init int ds_selftest(void)
 {
         if (ds_cfg.sizeof_rec[ds_bts]) {
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ca989158e84..fb5dfb891f0 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -14,6 +14,7 @@
 #include <asm/idle.h>
 #include <asm/uaccess.h>
 #include <asm/i387.h>
+#include <asm/ds.h>
 
 unsigned long idle_halt;
 EXPORT_SYMBOL(idle_halt);
@@ -45,6 +46,8 @@ void free_thread_xstate(struct task_struct *tsk)
                 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
                 tsk->thread.xstate = NULL;
         }
+
+        WARN(tsk->thread.ds_ctx, "leaking DS context\n");
 }
 
 void free_thread_info(struct thread_info *ti)
@@ -83,8 +86,6 @@ void exit_thread(void)
                 put_cpu();
                 kfree(bp);
         }
-
-        ds_exit_thread(current);
 }
 
 void flush_thread(void)
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 76f8f84043a..b5e4bfef447 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -290,7 +290,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
                 p->thread.io_bitmap_max = 0;
         }
 
-        ds_copy_thread(p, current);
+        clear_tsk_thread_flag(p, TIF_DS_AREA_MSR);
+        p->thread.ds_ctx = NULL;
 
         clear_tsk_thread_flag(p, TIF_DEBUGCTLMSR);
         p->thread.debugctlmsr = 0;
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index b751a41392b..5a1a1de292e 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -335,7 +335,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
                         goto out;
         }
 
-        ds_copy_thread(p, me);
+        clear_tsk_thread_flag(p, TIF_DS_AREA_MSR);
+        p->thread.ds_ctx = NULL;
 
         clear_tsk_thread_flag(p, TIF_DEBUGCTLMSR);
         p->thread.debugctlmsr = 0;