linux-kernel - Re: [Uclinux-dist-devel] [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm

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Date:	Tue, 25 May 2010 12:11:46 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Uclinux-dist-devel] [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix 
	the unsafe usage of child->mm

> are you suggesting the FDPIC additions are ill-advised as well ?
> curious how you would have implemented this if that's the case ...

They are certainly not as dismal as the arch PTRACE_PEEKUSR delivering
mm->fields.  But, frankly I don't think ptrace is the right mechanism for
delivering any read-only, process-shared information.  You can use some
/proc/pid/foo for that.  (The "dismal" cases deliver things like
start_code, which is already available in /proc/pid/stat.)


Thanks,
Roland
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