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| author | Oleg Nesterov <oleg@redhat.com> | 2014-04-13 20:58:54 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-06-21 00:15:12 -0400 |
| commit | 4af4206be2bd1933cae20c2b6fb2058dbc887f7c (patch) | |
| tree | a11266fc7f0eb38a6185698a899a914dda13ed57 /kernel | |
| parent | 7171511eaec5bf23fb06078f59784a3a0626b38f (diff) | |
| download | op-kernel-dev-4af4206be2bd1933cae20c2b6fb2058dbc887f7c.zip op-kernel-dev-4af4206be2bd1933cae20c2b6fb2058dbc887f7c.tar.gz | |
tracing: Fix syscall_*regfunc() vs copy_process() race
syscall_regfunc() and syscall_unregfunc() should set/clear
TIF_SYSCALL_TRACEPOINT system-wide, but do_each_thread() can race
with copy_process() and miss the new child which was not added to
the process/thread lists yet.
Change copy_process() to update the child's TIF_SYSCALL_TRACEPOINT
under tasklist.
Link: http://lkml.kernel.org/p/20140413185854.GB20668@redhat.com
Cc: stable@vger.kernel.org # 2.6.33
Fixes: a871bd33a6c0 "tracing: Add syscall tracepoints"
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/fork.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index d2799d1..6a13c46 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1487,7 +1487,9 @@ static struct task_struct *copy_process(unsigned long clone_flags, total_forks++; spin_unlock(¤t->sighand->siglock); + syscall_tracepoint_update(p); write_unlock_irq(&tasklist_lock); + proc_fork_connector(p); cgroup_post_fork(p); if (clone_flags & CLONE_THREAD) |
