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From: David Howells <dhowells@redhat.com>
To: Elena Reshetova <elena.reshetova@intel.com>
Cc: dhowells@redhat.com, linux-kernel@vger.kernel.org,
	linux-afs@lists.infradead.org, peterz@infradead.org,
	gregkh@linuxfoundation.org,
	Hans Liljestrand <ishkamiel@gmail.com>,
	Kees Cook <keescook@chromium.org>,
	David Windsor <dwindsor@gmail.com>
Subject: Re: [PATCH 3/4] fs, afs: convert afs_server.usage from atomic_t to refcount_t
Date: Wed, 22 Feb 2017 16:32:08 +0000	[thread overview]
Message-ID: <483.1487781128@warthog.procyon.org.uk> (raw)
In-Reply-To: <1487691808-11289-4-git-send-email-elena.reshetova@intel.com>

Elena Reshetova <elena.reshetova@intel.com> wrote:

> refcount_t type and corresponding API should be
> used instead of atomic_t when the variable is used as
> a reference counter. This allows to avoid accidental
> refcounter overflows that might lead to use-after-free
> situations.

Although I don't see an assertion for this (the window is too small), it is
possible for a dead server record to get resurrected.  Take a look at
afs_put_server() and note there's a check around the move to the graveyard.

So, please hold this patch also.

David

  parent reply	other threads:[~2017-02-22 16:32 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-21 15:43 [PATCH 0/4] fs, afs subsystem refcounter conversions Elena Reshetova
2017-02-21 15:43 ` [PATCH 1/4] fs, afs: convert afs_cell.usage from atomic_t to refcount_t Elena Reshetova
2017-02-21 15:43 ` [PATCH 2/4] fs, afs: convert afs_vlocation.usage " Elena Reshetova
2017-02-21 15:43 ` [PATCH 3/4] fs, afs: convert afs_server.usage " Elena Reshetova
2017-02-21 15:43 ` [PATCH 4/4] fs, afs: convert afs_volume.usage " Elena Reshetova
2017-02-22 16:16 ` [PATCH 1/4] fs, afs: convert afs_cell.usage " David Howells
2017-02-22 17:19   ` Reshetova, Elena
2017-02-22 17:29   ` David Howells
2017-02-22 17:39     ` Kees Cook
2017-02-23 13:32       ` Reshetova, Elena
2017-02-24 14:21     ` David Howells
2017-02-22 16:22 ` [PATCH 2/4] fs, afs: convert afs_vlocation.usage " David Howells
2017-02-22 16:32 ` David Howells [this message]
2017-02-23 14:05   ` [PATCH 3/4] fs, afs: convert afs_server.usage " Reshetova, Elena
2017-02-22 16:34 ` [PATCH 4/4] fs, afs: convert afs_volume.usage " David Howells

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