Re: [PATCH 1/2] proc: protect ptrace_may_access() with exec_update_lock (part 1)

[Jann Horn]

On Tue, May 26, 2026 at 10:48 AM Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> On 05/18, Jann Horn wrote:
> >
> > Fix the easy cases where procfs currently calls ptrace_may_access() without
> > exec_update_lock protection, where the fix is to simply add the extra lock
> > or use mm_access():
>
> I thought about this too, but I do not know if it is fine performance wise...
>
> And what about proc_coredump_filter_write() which doesn't use ptrace_may_access() ?

Yeah, this series doesn't fix everything, but I figured it would be
better to at least start fixing some of this stuff rather than leaving
this code as-is...