On Tue, Dec 31, 2024 at 4:32 AM Pu Lehui <pulehui@xxxxxxxxxxxxxxx> wrote:
> Commit ef1b808e3b7c ("bpf: Fix UAF via mismatching bpf_prog/attachment
> RCU flavors") resolved a possible UAF issue in uprobes that attach
> non-sleepable bpf prog by explicitly waiting for a tasks-trace-RCU grace
> period. But, in the current implementation, synchronize_rcu_tasks_trace
> is included within the mutex critical section, which increases the
> length of the critical section and may affect performance. So let's move
> out synchronize_rcu_tasks_trace from mutex CS.
>
> Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx>
This change looks good to me (though I don't know this area particularly well).
