From: Jan Kiszka <jan.kis...@siemens.com>
This both de-duplicates the code and ensures that all fields are zeroed
prior to calling one of the actual tcb initialization functions.
Specifically if host_task is not properly cleaned, we may cause a bug
when using the field earlier, e.g.
general protection fault: 0000 [#1] PREEMPT SMP
[...]
RIP: 0010:[<ffffffff81185a3c>] [<ffffffff81185a3c>] xnthread_host_pid+0x1c/0x30
[..]
Call Trace:
[<ffffffff8117c987>]
trace_event_raw_event_cobalt_thread_set_current_prio+0x57/0xa0
[<ffffffff8117f33d>] xnsched_set_effective_priority+0x8d/0xc0
[<ffffffff8117a1e4>] xnsched_rt_setparam+0x14/0x30
[<ffffffff8117e700>] xnsched_set_policy+0xc0/0x170
[<ffffffff81185687>] __xnthread_init+0x317/0x3d0
[<ffffffff8114a3e8>] ? trace_buffer_unlock_commit+0x58/0x70
[<ffffffff811857bb>] xnthread_init+0x7b/0x110
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
kernel/cobalt/thread.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel/cobalt/thread.c b/kernel/cobalt/thread.c
index 3d84ddd7b..ebdecfa91 100644
--- a/kernel/cobalt/thread.c
+++ b/kernel/cobalt/thread.c
@@ -212,6 +212,7 @@ int __xnthread_init(struct xnthread *thread,
thread->entry = NULL;
thread->cookie = NULL;
init_completion(&thread->exited);
+ memset(xnthread_archtcb(thread), 0, sizeof(struct xnarchtcb));
gravity = flags & XNUSER ? XNTIMER_UGRAVITY : XNTIMER_KGRAVITY;
xntimer_init(&thread->rtimer, &nkclock, timeout_handler,
@@ -260,7 +261,6 @@ void xnthread_init_shadow_tcb(struct xnthread *thread)
*/
__ipipe_share_current(0);
- memset(tcb, 0, sizeof(*tcb));
tcb->core.host_task = p;
tcb->core.tsp = &p->thread;
tcb->core.mm = p->mm;
@@ -279,7 +279,6 @@ void xnthread_init_root_tcb(struct xnthread *thread)
struct xnarchtcb *tcb = xnthread_archtcb(thread);
struct task_struct *p = current;
- memset(tcb, 0, sizeof(*tcb));
tcb->core.host_task = p;
tcb->core.tsp = &tcb->core.ts;
tcb->core.mm = p->mm;
--
2.13.6
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