Messages in this thread Patch in this message | | | From | Mandeep Singh Baines <> | Subject | [PATCH] sys_getppid: add missing rcu_dereference | Date | Tue, 6 Dec 2011 18:43:54 -0800 |
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In order to safely dereference current->real_parent inside an rcu_read_lock, we need an rcu_dereference.
Signed-off-by: Mandeep Singh Baines <msb@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kees Cook <kees@chromium.org> --- kernel/timer.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/timer.c b/kernel/timer.c index dbaa624..9c3c62b 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -1368,7 +1368,7 @@ SYSCALL_DEFINE0(getppid) int pid; rcu_read_lock(); - pid = task_tgid_vnr(current->real_parent); + pid = task_tgid_vnr(rcu_dereference(current->real_parent)); rcu_read_unlock(); return pid; -- 1.7.3.1
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