tracing: fix command line to pid reverse map

Impact: fix command line to pid mapping

map_cmdline_to_pid[] is checked in trace_save_cmdline(), but never
updated. This results in stale pid to command line mappings and the
tracer output will associate the wrong comm string.

Signed-off-by: Carsten Emde <Carsten.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 5 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 06c69a260328..305c562dae2a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -738,8 +738,7 @@ void trace_stop_cmdline_recording(void);
 
 static void trace_save_cmdline(struct task_struct *tsk)
 {
-        unsigned map;
-        unsigned idx;
+        unsigned pid, idx;
 
         if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
                 return;
@@ -757,10 +756,17 @@ static void trace_save_cmdline(struct task_struct *tsk)
         if (idx == NO_CMDLINE_MAP) {
                 idx = (cmdline_idx + 1) % SAVED_CMDLINES;
 
-                map = map_cmdline_to_pid[idx];
-                if (map != NO_CMDLINE_MAP)
-                        map_pid_to_cmdline[map] = NO_CMDLINE_MAP;
+                /*
+                 * Check whether the cmdline buffer at idx has a pid
+                 * mapped. We are going to overwrite that entry so we
+                 * need to clear the map_pid_to_cmdline. Otherwise we
+                 * would read the new comm for the old pid.
+                 */
+                pid = map_cmdline_to_pid[idx];
+                if (pid != NO_CMDLINE_MAP)
+                        map_pid_to_cmdline[pid] = NO_CMDLINE_MAP;
 
+                map_cmdline_to_pid[idx] = tsk->pid;
                 map_pid_to_cmdline[tsk->pid] = idx;
 
                 cmdline_idx = idx;