From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 16 Dec 2008 12:40:44 +0000 (+0100)
Subject: perfcounters: flush on setuid exec
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f65cb45cba63f249458b669aa67069eabc37b2f5;p=mv-sheeva.git

perfcounters: flush on setuid exec

Pavel Machek pointed out that performance counters should be flushed
when crossing protection domains on setuid execution.

Reported-by: Pavel Machek <pavel@suse.cz>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/fs/exec.c b/fs/exec.c
index ec5df9a3831..d5165d899a4 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -33,6 +33,7 @@
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/pagemap.h>
+#include <linux/perf_counter.h>
 #include <linux/highmem.h>
 #include <linux/spinlock.h>
 #include <linux/key.h>
@@ -1017,6 +1018,13 @@ int flush_old_exec(struct linux_binprm * bprm)
 		set_dumpable(current->mm, suid_dumpable);
 	}
 
+	/*
+	 * Flush performance counters when crossing a
+	 * security domain:
+	 */
+	if (!get_dumpable(current->mm))
+		perf_counter_exit_task(current);
+
 	/* An exec changes our domain. We are no longer part of the thread
 	   group */