From: Christoph Hellwig <hch@infradead.org>
To: James Morris <jmorris@namei.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
LSM List <linux-security-module@vger.kernel.org>,
Mimi Zohar <zohar@linux.vnet.ibm.com>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [GIT PULL] Security subsystem updates for 4.14
Date: Fri, 8 Sep 2017 00:09:43 -0700 [thread overview]
Message-ID: <20170908070943.GA26549@infradead.org> (raw)
In-Reply-To: <alpine.LRH.2.21.1709081448090.7880@namei.org>
The reason why I send out the original version of this patch
is because IMA used to call ->read under i_rwsem, and that deadlocked
on XFS and NFS, or ext3/4 with DAX. The call path for that is
process_measurement (takes i_rwsem)
-> ima_collect_measurement
-> ima_calc_file_hash
-> ima_calc_file_ahash / ima_calc_file_shash
-> ima_calc_file_hash_atfm / ima_calc_file_hash_tfm
-> integrity_kernel_read
ima_check_last_writer (takes i_rwsem)
-> ima_update_xattr
-> ima_collect_measurement
-> (as above)
But yes, for the init-time integrity_read_file this is incorrect.
It never tripped up, and I explicitly added the lockdep annotations
so that anything would show up, and it's been half a year since
I sent that first RFC patch..
next prev parent reply other threads:[~2017-09-08 7:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-04 10:29 [GIT PULL] Security subsystem updates for 4.14 James Morris
2017-09-07 18:19 ` Linus Torvalds
2017-09-08 4:48 ` James Morris
2017-09-08 7:09 ` Christoph Hellwig [this message]
2017-09-08 17:25 ` Linus Torvalds
2017-09-08 17:36 ` Paul Moore
2017-09-10 4:32 ` James Morris
2017-09-10 4:53 ` James Morris
2017-09-11 22:30 ` Paul Moore
2017-09-14 21:09 ` Kees Cook
2017-09-14 21:13 ` James Morris
2017-09-14 21:25 ` Kees Cook
2017-09-08 19:57 ` James Morris
2017-09-17 7:36 ` Mimi Zohar
2017-09-10 8:10 ` Christoph Hellwig
2017-09-10 14:02 ` Mimi Zohar
2017-09-11 6:38 ` Christoph Hellwig
2017-09-11 21:34 ` Mimi Zohar
2017-09-08 22:38 ` Theodore Ts'o
2017-09-10 2:08 ` James Morris
2017-09-10 7:13 ` Mimi Zohar
2017-09-10 12:17 ` Theodore Ts'o
2017-09-10 6:46 ` Mimi Zohar
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