3.2.49-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Stephane Eranian <eran...@google.com>
commit 2976b10f05bd7f6dab9f9e7524451ddfed656a89 upstream.
There was a a bug in setup_new_exec(), whereby
the test to disabled perf monitoring was not
correct because the new credentials for the
process were not yet committed and therefore
the get_dumpable() test was never firing.
The patch fixes the problem by moving the
perf_event test until after the credentials
are committed.
Signed-off-by: Stephane Eranian <eran...@google.com>
Tested-by: Jiri Olsa <jo...@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijls...@chello.nl>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
fs/exec.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1159,13 +1159,6 @@ void setup_new_exec(struct linux_binprm
set_dumpable(current->mm, suid_dumpable);
}
- /*
- * Flush performance counters when crossing a
- * security domain:
- */
- if (!get_dumpable(current->mm))
- perf_event_exit_task(current);
-
/* An exec changes our domain. We are no longer part of the thread
group */
@@ -1229,6 +1222,15 @@ void install_exec_creds(struct linux_bin
commit_creds(bprm->cred);
bprm->cred = NULL;
+
+ /*
+ * Disable monitoring for regular users
+ * when executing setuid binaries. Must
+ * wait until new credentials are committed
+ * by commit_creds() above
+ */
+ if (get_dumpable(current->mm) != SUID_DUMP_USER)
+ perf_event_exit_task(current);
/*
* cred_guard_mutex must be held at least to this point to prevent
* ptrace_attach() from altering our determination of the task's
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
