From: Sasha Levin <sashal@kernel.org>
To: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sasha Levin <Alexander.Levin@microsoft.com>,
stable <stable@vger.kernel.org>
Subject: Re: [stable] timer/debug: Change /proc/timer_list from 0444 to 0400
Date: Mon, 17 Dec 2018 18:32:44 -0500 [thread overview]
Message-ID: <20181217233244.GV2746@sasha-vm> (raw)
In-Reply-To: <1545084063.19315.130.camel@codethink.co.uk>
On Mon, Dec 17, 2018 at 10:01:03PM +0000, Ben Hutchings wrote:
>Please pick this commit for 4.14 and older stable branches:
>
>commit 8e7df2b5b7f245c9bd11064712db5cb69044a362
>Author: Ingo Molnar <mingo@kernel.org>
>Date:���Mon Nov 13 07:15:41 2017 +0100
>
>����timer/debug: Change /proc/timer_list from 0444 to 0400
>
>In older kernel versions this file makes it far too easy to exploit
>arbitrary-write bugs. It's possible to hide the pointers from
>unprivileged users by setting the kernel.kptr_restrict sysctl, but that
>wasn't done by default.
>
>(Upstream commits c1eba5bcb643 "timer: Pass timer_list pointer to
>callbacks unconditionally" and ad67b74d2469 "printk: hash addresses
>printed with %p" provide more general mitigations, but don't seem to be
>suitable for stable.)
I've queued 8e7df2b5b7f2 for <=4.14, thank you.
--
Thanks,
Sasha
prev parent reply other threads:[~2018-12-17 23:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-17 22:01 [stable] timer/debug: Change /proc/timer_list from 0444 to 0400 Ben Hutchings
2018-12-17 23:32 ` Sasha Levin [this message]
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