From: Roland McGrath <roland@redhat.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Mike Frysinger <vapier@gentoo.org>,
Andrew Morton <akpm@linux-foundation.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: Re: [PATCH v2] ptrace: unify FDPIC implementations
Date: Fri, 21 May 2010 11:35:12 -0700 (PDT) [thread overview]
Message-ID: <20100521183512.4477F40476@magilla.sf.frob.com> (raw)
In-Reply-To: Oleg Nesterov's message of Friday, 21 May 2010 18:26:59 +0200 <20100521162659.GA16193@redhat.com>
> 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. 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.
Thanks,
Roland
next prev parent reply other threads:[~2010-05-21 18:35 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-16 0:30 [PATCH] " 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 [this message]
2010-05-22 16:53 ` [PATCH -mm 0/1] (Was: ptrace: unify FDPIC implementations) Oleg Nesterov
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
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