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SubjectRe: [PATCH v2 1/1] audit_alloc: clear TIF_SYSCALL_AUDIT if !audit_context
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On Sun, 2013-09-15 at 19:11 +0200, Oleg Nesterov wrote:
> If audit_filter_task() nacks the new thread it makes sense
> to clear TIF_SYSCALL_AUDIT which can be copied from parent
> by dup_task_struct().
>
> A wrong TIF_SYSCALL_AUDIT is not really bad but it triggers
> the "slow" audit paths in entry.S to ensure the task can not
> miss audit_syscall_*() calls, this is pointless if the task
> has no ->audit_context.
>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
> Acked-by: Steve Grubb <sgrubb@redhat.com>

Acked-by: Eric Paris <eparis@redhat.com>

Richard, please pick this up into your tree.

> ---
> kernel/auditsc.c | 4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 9845cb3..95293ab 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -943,8 +943,10 @@ int audit_alloc(struct task_struct *tsk)
> return 0; /* Return if not auditing. */
>
> state = audit_filter_task(tsk, &key);
> - if (state == AUDIT_DISABLED)
> + if (state == AUDIT_DISABLED) {
> + clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
> return 0;
> + }
>
> if (!(context = audit_alloc_context(state))) {
> kfree(key);




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