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From: Denis Efremov <efremov@linux.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
	linux-integrity@vger.kernel.org,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Subject: IMA/EVM interfaces
Date: Tue, 28 Jul 2020 13:32:29 +0300	[thread overview]
Message-ID: <bf04bf15-cddd-ce22-926a-8459c1f92779@linux.com> (raw)

Hi,

I've started to add integrity interfaces descriptions to syzkaller
(https://github.com/google/syzkaller/pull/1970).

I've got a question, if you don't mind:

If I write 2 to /sys/kernel/security/integrity/evm/evm before loading keys,
subsequent fs operations will fail with -ENOKEY.

$ echo 2 > /sys/kernel/security/integrity/evm/evm
$ touch test.txt
[  526.976855][ T5771] evm: HMAC key is not set
[  526.977892][ T5771] evm: init_desc failed
touch: cannot touch 'test.txt': Required key not available

Is this a desired behavior? Should there be a check in evm_write_key()
for loaded keys (encrypted evm-key, keys in _evm, _ima keyrings) before
changing the evm_initialized bit? Is it correct to set second bit without
first bit?

Thanks,
Denis

             reply	other threads:[~2020-07-28 10:32 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28 10:32 Denis Efremov [this message]
2020-07-28 15:43 ` IMA/EVM interfaces Roberto Sassu
2020-07-29 21:59   ` Denis Efremov
2020-07-30  6:50     ` Roberto Sassu
2020-07-31 18:45       ` Mimi Zohar

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