From: Oleg Nesterov <oleg@redhat.com>
To: Roland McGrath <roland@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Mike Frysinger <vapier@gentoo.org>,
linux-sh@vger.kernel.org, Paul Mundt <lethal@linux-sh.org>,
uclinux-dist-devel@blackfin.uclinux.org,
linux-kernel@vger.kernel.org, David Howells <dhowells@redhat.com>
Subject: [PATCH -mm 0/1] (Was: ptrace: unify FDPIC implementations)
Date: Sat, 22 May 2010 18:53:20 +0200 [thread overview]
Message-ID: <20100522165320.GA19573@redhat.com> (raw)
In-Reply-To: <20100521183512.4477F40476@magilla.sf.frob.com>
On 05/21, Roland McGrath wrote:
>
> > This looks unsafe. What protect child->mm if ptrace() races with SIGKILL ?
> >
> > Of course, I do not blame this patch, the code was copied from arch/, but
> > I think we need another patch which checks ->mm != NULL under task_lock()
> > on top of this one?
>
> Agreed, unless things are somehow different on nommu so there aren't such
> races.
I don't this !CONFG_MMU can make any difference, nothing can protect us
from exit_mm() afaics.
> But, as you mention, this is a long-standing issue that is entirely
> unrelated to the cleanup here and should not delay merging this patch.
Yes, yes, agreed.
Please see the patch on top of ptrace-unify-fdpic-implementations.patch
Untested, but hopefully trivial enough.
Oleg.
next prev parent reply other threads:[~2010-05-22 14:54 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-16 0:30 [PATCH] ptrace: unify FDPIC implementations Mike Frysinger
2010-02-16 1:10 ` Paul Mundt
2010-02-16 8:12 ` Mike Frysinger
2010-05-21 8:42 ` [PATCH v2] " Mike Frysinger
2010-05-21 16:26 ` Oleg Nesterov
2010-05-21 18:35 ` Roland McGrath
2010-05-22 16:53 ` Oleg Nesterov [this message]
2010-05-22 16:54 ` [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm Oleg Nesterov
2010-05-24 4:33 ` [Uclinux-dist-devel] " Mike Frysinger
2010-05-24 8:38 ` Roland McGrath
2010-05-24 14:36 ` David Howells
2010-05-24 15:14 ` Oleg Nesterov
2010-05-24 23:42 ` Roland McGrath
2010-05-25 1:29 ` [Uclinux-dist-devel] " Mike Frysinger
2010-05-25 19:11 ` Roland McGrath
2010-05-25 9:14 ` David Howells
2010-05-25 10:23 ` Oleg Nesterov
2010-05-25 17:28 ` Mike Frysinger
2010-05-26 12:40 ` Oleg Nesterov
2010-05-27 19:55 ` [PATCH 0/2] blackfin: ptrace mm/sram_list fixes Oleg Nesterov
2010-05-27 19:56 ` [PATCH 1/2] blackfin: ptrace: fix the unsafe usage of mm/find_vma in is_user_addr_valid() Oleg Nesterov
2010-05-27 19:56 ` [PATCH 2/2] blackfin: use ->mmap_sem to protect mm_context_t->sram_list Oleg Nesterov
2010-05-27 20:21 ` [PATCH 0/2] blackfin: ptrace mm/sram_list fixes Mike Frysinger
2010-05-28 19:43 ` Oleg Nesterov
2010-05-25 12:24 ` [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm David Howells
2010-05-25 12:30 ` Oleg Nesterov
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=20100522165320.GA19573@redhat.com \
--to=oleg@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=dhowells@redhat.com \
--cc=lethal@linux-sh.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=roland@redhat.com \
--cc=uclinux-dist-devel@blackfin.uclinux.org \
--cc=vapier@gentoo.org \
/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
Powered by JetHome