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

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Message-ID: <AANLkTinCtKiXjz08FI6EDUKWgLRDd64UVgDawhonZr__@mail.gmail.com>
Date:	Mon, 24 May 2010 00:33:38 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Frysinger <vapier@...too.org>, 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
Subject: Re: [Uclinux-dist-devel] [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix 
	the unsafe usage of child->mm

On Sat, May 22, 2010 at 12:54, Oleg Nesterov wrote:
> Now that Mike Frysinger unified the FDPIC ptrace code, we can fix
> the unsafe usage of child->mm in ptrace_request(PTRACE_GETFDPIC).
>
> We have the reference to task_struct, and ptrace_check_attach()
> verified the tracee is stopped. But nothing can protect from
> SIGKILL after that, we must not assume child->mm != NULL.

gdb still works with FDPIC apps after this, so presumably it works
fine :).  ive added it to the Blackfin tree to get more testing on our
side (not that i'll be pushing it out or anything).

thanks!
-mike
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