linux-kernel - Re: [RFC PATCH RESEND v3 3/3] ptrace: add PTRACE_EVENT_SECCOMP support to PTRACE_GET_SYSCALL

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Date:   Wed, 28 Nov 2018 14:13:48 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Dmitry V. Levin" <ldv@...linux.org>
Cc:     Elvira Khabirova <lineprinter@...linux.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, strace-devel@...ts.strace.io
Subject: Re: [RFC PATCH RESEND v3 3/3] ptrace: add PTRACE_EVENT_SECCOMP
 support to PTRACE_GET_SYSCALL_INFO

On 11/28, Dmitry V. Levin wrote:
>
> What about PTRACE_GETSIGINFO?  Can it also be done lockless because
> ptrace_check_attach() has already called ptrace_freeze_traced()?

Yes, only PTRACE_INTERRUPT needs lock_task_sighand() and it can actually
fail because the tracee is not necessarily stopped.

Oleg.