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SubjectRe: [PATCH] send_sigio_to_task: sanitize the usage of fown->signum
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Oleg Nesterov <oleg@redhat.com> wrote:

> send_sigio_to_task() reads fown->signum several times, we can race with
> F_SETSIG which changes ->signum lockless. In theory, this can fool security
> checks or we can call group_send_sig_info() with the wrong ->si_signo which
> does not match "int sig".
>
> Change the code to cache ->signum.
>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>

Acked-by: David Howells <dhowells@redhat.com>


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