Linus,
Please pull the latest perf-urgent-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
perf-urgent-for-linus
HEAD: 2976b10f05bd7f6dab9f9e7524451ddfed656a89 perf: Disable monitoring on
setuid processes for regular users
One more fix for a recently discovered bug.
Thanks,
Ingo
------------------>
Stephane Eranian (1):
perf: Disable monitoring on setuid processes for regular users
fs/exec.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/fs/exec.c b/fs/exec.c
index 6430195..ffd7a81 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1135,13 +1135,6 @@ void setup_new_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_event_exit_task(current);
-
/* An exec changes our domain. We are no longer part of the thread
group */
@@ -1205,6 +1198,15 @@ void install_exec_creds(struct linux_binprm *bprm)
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
--
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