linux-kernel - Re: Re: [PATCH RESEND v3 1/3] ptrace: pass type of a syscall-stop in ptrace

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Message-ID: <20181125061726.jtalb5t4tgigzzue@gmail.com>
Date:   Sat, 24 Nov 2018 20:17:26 -1000
From:   Joey Pabalinas <joeypabalinas@...il.com>
To:     "Dmitry V. Levin" <ldv@...linux.org>
Cc:     Joey Pabalinas <joeypabalinas@...il.com>,
        Elvira Khabirova <lineprinter@...linux.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        strace-devel@...ts.strace.io
Subject: Re: Re: [PATCH RESEND v3 1/3] ptrace: pass type of a syscall-stop in
 ptrace_message

On Sun, Nov 25, 2018 at 05:10:59AM +0300, Dmitry V. Levin wrote:
> Given that without this patch the value returned by PTRACE_GETEVENTMSG
> during syscall stop is undefined, we need two different ptrace_message
> values that cannot be set by other ptrace events to enable reliable
> identification of syscall-enter-stop and syscall-exit-stop in userspace:
> if we make PTRACE_GETEVENTMSG return 0 or any other value routinely set by
> other ptrace events, it would be hard for userspace to find out whether
> the kernel implements new semantics or not.

Ah, I see, I agree that definitely makes sense.

-- 
Cheers,
Joey Pabalinas

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