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Date:   Wed, 16 Jun 2021 20:50:38 +0000
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     "Eric W. Biederman" <ebiederm@xmission.com>
Cc:     Michael Schmitz <schmitzmic@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Ley Foon Tan <ley.foon.tan@intel.com>,
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Subject: Re: [PATCH] alpha: Add extra switch_stack frames in exit, exec, and
 kernel threads
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On Tue, Jun 15, 2021 at 02:36:38PM -0500, Eric W. Biederman wrote:
> 
> While thinking about the information leaks fixed in 77f6ab8b7768
> ("don't dump the threads that had been already exiting when zapped.")
> I realized the problem is much more general than just coredumps and
> exit_mm.  We have io_uring threads, PTRACE_EVENT_EXEC and
> PTRACE_EVENT_EXIT where ptrace is allowed to access userspace
> registers, but on some architectures has not saved them.

Wait a sec.  To have anything happen on PTRACE_EVENT_EXEC, you need the
fucker traced.  *IF* you want to go that way, at least make it conditional
upon the same thing.