[PATCH 1/1] audit,io_uring,io-wq: call __audit_uring_exit for dummy contexts

[Paul Moore]

On Tue, May 17, 2022 at 6:33 AM Julian Orth <ju.orth at gmail.com> wrote:
>
> Not calling the function for dummy contexts will cause the context to
> not be reset. During the next syscall, this will cause an error in
> __audit_syscall_entry:
>
>         WARN_ON(context->context != AUDIT_CTX_UNUSED);
>         WARN_ON(context->name_count);
>         if (context->context != AUDIT_CTX_UNUSED || context->name_count) {
>                 audit_panic("unrecoverable error in audit_syscall_entry()");
>                 return;
>         }
>
> These problematic dummy contexts are created via the following call
> chain:
>
>        exit_to_user_mode_prepare
>     -> arch_do_signal_or_restart
>     -> get_signal
>     -> task_work_run
>     -> tctx_task_work
>     -> io_req_task_submit
>     -> io_issue_sqe
>     -> audit_uring_entry
>
> Fixes: 5bd2182d58e9 ("audit,io_uring,io-wq: add some basic audit support to io_uring")
> Signed-off-by: Julian Orth <ju.orth at gmail.com>
> ---
>  include/linux/audit.h | 2 +-
>  kernel/auditsc.c      | 6 ++++++
>  2 files changed, 7 insertions(+), 1 deletion(-)

Hi Julian,

Thanks for the report and the patch too!  I agree that it does seem a
little odd that we haven't seen this before, let me dig into this a
bit more today and respond back.

-- 
paul-moore.com