[patch 1/21] x86, bts: fix race when bts tracer is removed

[Markus Metzger]

When the bts tracer is removed while the traced task is running,
the write to clear the bts tracer pointer races with context switch code.

Read the tracer once during a context switch.


When a new tracer is installed, the bts tracer is set in the ds context
before the tracer is initialized in order to claim the context for that
tracer.
This may result in write accesses using an uninitialized trace configuration
when scheduling timestamps have been requested.

Store active tracing flags separately and only set active flags after
the tracing configuration has been initialized.


Signed-off-by: Markus Metzger <markus.t.metzger@xxxxxxxxx>
---

Index: git-tip/arch/x86/kernel/ds.c
===================================================================
--- git-tip.orig/arch/x86/kernel/ds.c	2009-03-30 17:47:21.000000000 +0200
+++ git-tip/arch/x86/kernel/ds.c	2009-03-30 17:48:31.000000000 +0200
@@ -89,6 +89,9 @@ struct bts_tracer {
 
 	/* Buffer overflow notification function: */
 	bts_ovfl_callback_t	ovfl;
+
+	/* Active flags affecting trace collection. */
+	unsigned int		flags;
 };
 
 struct pebs_tracer {
@@ -799,6 +802,8 @@ void ds_suspend_bts(struct bts_tracer *t
 	if (!tracer)
 		return;
 
+	tracer->flags = 0;
+
 	task = tracer->ds.context->task;
 
 	if (!task || (task == current))
@@ -820,6 +825,8 @@ void ds_resume_bts(struct bts_tracer *tr
 	if (!tracer)
 		return;
 
+	tracer->flags = tracer->trace.ds.flags;
+
 	task = tracer->ds.context->task;
 
 	control = ds_cfg.ctl[dsf_bts];
@@ -1044,36 +1051,39 @@ void ds_switch_to(struct task_struct *pr
 {
 	struct ds_context *prev_ctx = prev->thread.ds_ctx;
 	struct ds_context *next_ctx = next->thread.ds_ctx;
+	unsigned long debugctlmsr = next->thread.debugctlmsr;
 
 	if (prev_ctx) {
+		struct bts_tracer *tracer = prev_ctx->bts_master;
+
 		update_debugctlmsr(0);
 
-		if (prev_ctx->bts_master &&
-		    (prev_ctx->bts_master->trace.ds.flags & BTS_TIMESTAMPS)) {
+		if (tracer && (tracer->flags & BTS_TIMESTAMPS)) {
 			struct bts_struct ts = {
 				.qualifier = bts_task_departs,
 				.variant.timestamp.jiffies = jiffies_64,
 				.variant.timestamp.pid = prev->pid
 			};
-			bts_write(prev_ctx->bts_master, &ts);
+			bts_write(tracer, &ts);
 		}
 	}
 
 	if (next_ctx) {
-		if (next_ctx->bts_master &&
-		    (next_ctx->bts_master->trace.ds.flags & BTS_TIMESTAMPS)) {
+		struct bts_tracer *tracer = next_ctx->bts_master;
+
+		if (tracer && (tracer->flags & BTS_TIMESTAMPS)) {
 			struct bts_struct ts = {
 				.qualifier = bts_task_arrives,
 				.variant.timestamp.jiffies = jiffies_64,
 				.variant.timestamp.pid = next->pid
 			};
-			bts_write(next_ctx->bts_master, &ts);
+			bts_write(tracer, &ts);
 		}
 
 		wrmsrl(MSR_IA32_DS_AREA, (unsigned long)next_ctx->ds);
 	}
 
-	update_debugctlmsr(next->thread.debugctlmsr);
+	update_debugctlmsr(debugctlmsr);
 }
 
 void ds_copy_thread(struct task_struct *tsk, struct task_struct *father)
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