From: Jann Horn <jannh@google.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
Christian Brauner <christian@brauner.io>,
lkml <linux-kernel@vger.kernel.org>,
linux-man <linux-man@vger.kernel.org>,
Kees Cook <keescook@chromium.org>,
Oleg Nesterov <oleg@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
David Howells <dhowells@redhat.com>,
Pavel Emelyanov <xemul@virtuozzo.com>,
Andrew Morton <akpm@linux-foundation.org>,
Adrian Reber <adrian@lisas.de>, Andrei Vagin <avagin@gmail.com>,
Linux API <linux-api@vger.kernel.org>
Subject: Re: For review: documentation of clone3() system call
Date: Mon, 11 Nov 2019 16:15:58 +0100 [thread overview]
Message-ID: <CAG48ez3zpBwU6vHSuY6VoP+Uw_Jz6uxYN1Teg2wSpwZrPmAn-g@mail.gmail.com> (raw)
In-Reply-To: <87tv7awj4g.fsf@oldenburg2.str.redhat.com>
On Mon, Nov 11, 2019 at 4:03 PM Florian Weimer <fweimer@redhat.com> wrote:
>
> * Michael Kerrisk:
>
> > Another difference for the raw clone() system call is that the
> > stack argument may be NULL, in which case the child uses a dupli‐
> > cate of the parent's stack. (Copy-on-write semantics ensure that
> > the child gets separate copies of stack pages when either process
> > modifies the stack.) In this case, for correct operation, the
> > CLONE_VM option should not be specified. (If the child shares the
> > parent's memory because of the use of the CLONE_VM flag, then no
> > copy-on-write duplication occurs and chaos is likely to result.)
>
> I think sharing the stack also works with CLONE_VFORK with CLONE_VM, as
> long as measures are taken to preserve the return address in a register.
That basically just requires that the userspace function declaration
for clone3 includes __attribute__((returns_twice)), right?
next prev parent reply other threads:[~2019-11-11 15:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-25 16:59 For review: documentation of clone3() system call Michael Kerrisk (man-pages)
2019-10-25 17:07 ` Christian Brauner
2019-11-07 12:26 ` Michael Kerrisk (man-pages)
2019-10-28 15:12 ` Jann Horn
2019-10-28 17:21 ` Christian Brauner
2019-10-28 19:09 ` Jann Horn
2019-10-29 11:27 ` Christian Brauner
2019-10-29 14:26 ` Christian Brauner
2019-10-29 14:36 ` Florian Weimer
2019-10-29 16:04 ` Christian Brauner
2019-10-29 15:20 ` Jann Horn
2019-10-29 16:05 ` Christian Brauner
2019-11-07 15:19 ` Christian Brauner
2019-11-07 16:10 ` Florian Weimer
2019-11-09 8:09 ` Michael Kerrisk (man-pages)
2019-11-09 16:53 ` Christian Brauner
2019-11-11 9:02 ` Michael Kerrisk (man-pages)
2019-11-11 11:36 ` Christian Brauner
2019-11-11 19:56 ` Michael Kerrisk (man-pages)
2019-11-11 14:55 ` Jann Horn
2019-11-11 16:58 ` Theodore Y. Ts'o
2019-11-11 20:24 ` Jann Horn
2019-11-12 23:03 ` Kees Cook
2019-11-14 12:15 ` Michael Kerrisk (man-pages)
2019-11-14 12:29 ` Christian Brauner
2019-11-11 15:03 ` Florian Weimer
2019-11-11 15:15 ` Jann Horn [this message]
2019-11-11 15:20 ` Florian Weimer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAG48ez3zpBwU6vHSuY6VoP+Uw_Jz6uxYN1Teg2wSpwZrPmAn-g@mail.gmail.com \
--to=jannh@google.com \
--cc=adrian@lisas.de \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--cc=avagin@gmail.com \
--cc=christian@brauner.io \
--cc=dhowells@redhat.com \
--cc=fweimer@redhat.com \
--cc=keescook@chromium.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-man@vger.kernel.org \
--cc=mtk.manpages@gmail.com \
--cc=oleg@redhat.com \
--cc=xemul@virtuozzo.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).