From: Solar Designer <solar@openwall.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Sergey Vlasov <vsu@altlinux.ru>,
vendor-sec@lst.de, linux-kernel@vger.kernel.org,
security@linux.kernel.org
Subject: Re: PID reuse safety for userspace apps (Re: [linux-usb-devel] Re: [Security] [vendor-sec] [BUG/PATCH/RFC] Oops while completing async USB via usbdevio)
Date: Wed, 28 Sep 2005 01:16:24 +0400 [thread overview]
Message-ID: <20050927211624.GA4947@openwall.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0509271335530.3308@g5.osdl.org>
On Tue, Sep 27, 2005 at 01:42:44PM -0700, Linus Torvalds wrote:
> Note that for at least signal sending, the security aspect is _not_ about
> whether the pid has been re-used, but about whether the _user_ matches.
That's true. And, changing topic to userspace apps, killall(1)
currently has no race-free way to check whether the user still matches.
There's also the reliability aspect: killing one's own process, but
other than the intended one, is a reliability issue.
What I have proposed is a way to deal with both of these.
killall is just an example. A GUI point-and-click task manager would
have the same problem and the same solution would work for it.
--
Alexander
next prev parent reply other threads:[~2005-09-27 21:17 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-25 15:13 [BUG/PATCH/RFC] Oops while completing async USB via usbdevio Harald Welte
2005-09-27 8:04 ` [vendor-sec] " Greg KH
2005-09-27 9:13 ` Greg KH
[not found] ` <20050927110319.GD1980@piware.de>
2005-09-27 12:22 ` [vendor-sec] " Greg KH
2005-09-27 12:48 ` [vendor-sec] " Christoph Hellwig
2005-09-27 12:57 ` Greg KH
2005-09-27 12:59 ` Christoph Hellwig
2005-09-27 13:09 ` Greg KH
2005-09-27 15:27 ` David Brownell
2005-09-27 14:53 ` [Security] " Linus Torvalds
2005-09-27 16:00 ` [linux-usb-devel] " Sergey Vlasov
2005-09-27 16:09 ` Linus Torvalds
2005-09-27 16:52 ` Sergey Vlasov
2005-09-27 17:02 ` Linus Torvalds
2005-09-30 10:47 ` Harald Welte
2005-09-30 14:56 ` Linus Torvalds
2005-09-30 18:44 ` Chris Wright
2005-09-30 19:27 ` Linus Torvalds
2005-09-30 20:38 ` Chris Wright
2005-09-30 22:08 ` Harald Welte
2005-09-30 22:16 ` Linus Torvalds
2005-10-10 17:44 ` Harald Welte
2005-10-10 18:07 ` Chris Wright
2005-10-11 9:45 ` Harald Welte
2005-10-11 23:10 ` [vendor-sec] " Greg KH
2005-10-11 23:44 ` Linus Torvalds
2005-10-12 7:24 ` Harald Welte
2005-10-13 5:51 ` Horms
2005-10-11 13:57 ` Bernd Petrovitsch
2005-10-10 18:19 ` Linus Torvalds
2005-10-10 22:47 ` Chris Wright
2005-10-10 20:03 ` [linux-usb-devel] " Alan Stern
2005-10-11 8:28 ` Harald Welte
2005-10-11 17:37 ` Paul Jackson
2005-10-11 17:58 ` linux-os (Dick Johnson)
2005-10-11 19:13 ` Alan Stern
2005-10-11 20:02 ` [Security] " Alan Cox
2005-09-27 17:20 ` PID reuse safety for userspace apps (Re: [linux-usb-devel] Re: [Security] [vendor-sec] [BUG/PATCH/RFC] Oops while completing async USB via usbdevio) Solar Designer
2005-09-27 20:34 ` Alan Cox
2005-09-27 20:42 ` Linus Torvalds
2005-09-27 21:16 ` Solar Designer [this message]
2005-09-27 21:03 ` Solar Designer
2005-09-27 16:58 ` [linux-usb-devel] Re: [Security] [vendor-sec] [BUG/PATCH/RFC] Oops while completing async USB via usbdevio Alan Cox
2005-09-27 16:59 ` Linus Torvalds
2005-09-27 20:35 ` Alan Cox
2005-10-13 23:00 ` Pete Zaitcev
2005-10-13 23:16 ` Linus Torvalds
2005-10-13 23:56 ` Pete Zaitcev
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