linux-kernel - Re: [PATCH v3 1/3] KEYS: Don't write out to userspace while holding key semaphore

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Message-ID: <1794026.1584358459@warthog.procyon.org.uk>
Date:   Mon, 16 Mar 2020 11:34:19 +0000
From:   David Howells <dhowells@...hat.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     dhowells@...hat.com, Waiman Long <longman@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Mimi Zohar <zohar@...ux.ibm.com>, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        Sumit Garg <sumit.garg@...aro.org>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Chris von Recklinghausen <crecklin@...hat.com>
Subject: Re: [PATCH v3 1/3] KEYS: Don't write out to userspace while holding key semaphore

Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> wrote:

> Do you have a test case that can reproduce this on a constant basis?

In this case it's quite tricky because a network filesystem is involved.  I
wonder if it might be possible to do it with fscrypt or ecryptfs.

David