From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
torvalds@osdl.org
Subject: Potential security problem in patch: Fix reading /proc/<pid>/mem when parent dies.
Date: Thu, 18 Nov 2004 23:27:56 +0000 [thread overview]
Message-ID: <1100820455.6019.31.camel@localhost.localdomain> (raw)
In-Reply-To: <200411181704.iAIH4SSb023079@hera.kernel.org>
On Iau, 2004-11-18 at 16:01, Linux Kernel Mailing List wrote:
> ChangeSet 1.2155, 2004/11/18 08:01:00-08:00, torvalds@ppc970.osdl.org
>
> Fix reading /proc/<pid>/mem when parent dies.
>
> We should not touch "self_exec_id" here. The parent changed,
> not we.
The original point of this was that if our parent changed then our new
parent is not aware of our special status. As a result we can send
random signals to init and since it does not see SIGCLD we can get
zombies or worse when we exit.
The original code was correct here for protecting init. The side effect
does need fixing but not this way. Perhaps it would be simpler just to
protect init as it is already "special" for signal handling.
Alan
next parent reply other threads:[~2004-11-19 0:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200411181704.iAIH4SSb023079@hera.kernel.org>
2004-11-18 23:27 ` Alan Cox [this message]
2004-11-19 0:52 ` Potential security problem in patch: Fix reading /proc/<pid>/mem when parent dies Linus Torvalds
2004-11-19 0:00 ` Alan Cox
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