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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>
This commit is contained in:
Ingo Molnar 2008-12-16 13:40:44 +01:00
parent 0cc0c027d4
commit f65cb45cba
1 changed files with 8 additions and 0 deletions
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8
fs/exec.c
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@ -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 */