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Message-ID: <09205bd9-a5b6-48db-81ec-064d77e94248@cispa.de>
Date: Sun, 8 Oct 2023 08:55:51 +0200
From: Michael Schwarz <michael.schwarz@...pa.de>
To: Solar Designer <solar@...nwall.com>
CC: <oss-security@...ts.openwall.com>, <fabian.thomas@...pa.de>,
<lukas.gerlach@...pa.de>, <ruiyi.zhang@...pa.de>, Daniel Weber
<daniel.weber@...pa.de>
Subject: Re: Meltdown-US / Meltdown 3a Remaining Leakage
Hi Alexander,
On 07.10.23 00:18, Solar Designer wrote:
> In Linux, /proc/interrupts is generally world-readable. So perhaps
> that's something to fix first, since yes it's known to allow for
> keystroke timing attacks. Should be fixed in the kernel or/and chmod'ed
> by the userland. And then:
Yes, that is true. Android, for example, prevents unprivileged access
since version 8 to this file to prevent such attacks:
https://issuetracker.google.com/issues/37140047?pli=1
If our proposed mitigation is implemented (e.g., as opt-in using a
kernel command-line parameter), the implementation could additionally
prevent unprivileged access to /proc/interrupts.
Michael
--
Dr. Michael Schwarz
Faculty
CISPA Helmholtz Center for Information Security
Stuhlsatzenhaus 5, Saarland Informatics Campus
66123 Saarbrücken, Germany
Mail: michael.schwarz@...pa.de
Web: https://www.cispa.saarland
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