From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CFCC55E4C for ; Thu, 21 Dec 2023 13:46:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Ka4K0s4g" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1703166365; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=rlyXAqOlyS384Hk8kpuBXYflRK12oBrIJ43cpC5VRV8=; b=Ka4K0s4gamLfpwNuGn00hy8PyQ2HXIbMVw9I6il9iZbGJ2VyxLY1dwxjxfzJ1APqZdjm0G v/AjIxgWprpVE2IiJ54cYg2TdaS6TGZ9OYCMBQMaGE03v6G7RFFnWbflZYAB/K/f1KmTwj bW60m9iZwfgJ08vZS3yQKm/mNk9gFaA= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-544-hD6chBcqNRCdWwRwvh-SaA-1; Thu, 21 Dec 2023 08:46:02 -0500 X-MC-Unique: hD6chBcqNRCdWwRwvh-SaA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 653233C29A72; Thu, 21 Dec 2023 13:46:01 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.39.195.169]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4E6F7C1596E; Thu, 21 Dec 2023 13:46:00 +0000 (UTC) From: David Howells To: Markus Suvanto , Marc Dionne Cc: David Howells , linux-afs@lists.infradead.org, keyrings@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 0/3] afs: Fix dynamic root interaction with failing DNS lookups Date: Thu, 21 Dec 2023 13:45:27 +0000 Message-ID: <20231221134558.1659214-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 Hi Markus, Marc, Here's a set of fixes to improve the interaction of arbitrary lookups in the AFS dynamic root that hit DNS lookup failures[1]: (1) Always delete unused (particularly negative) dentries as soon as possible so that they don't prevent future lookups from retrying. (2) Fix the handling of new-style negative DNS lookups in ->lookup() to make them return ENOENT so that userspace doesn't get confused when stat succeeds but the following open on the looked up file then fails. (3) Fix key handling so that DNS lookup results are reclaimed as soon as they expire rather than sitting round either forever or for an additional 5 mins beyond a set expiry time returning EKEYEXPIRED. The patches can be found here: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=afs-fixes Thanks, David Link: https://bugzilla.kernel.org/show_bug.cgi?id=216637 [1] Link: https://lore.kernel.org/r/20231211163412.2766147-1-dhowells@redhat.com/ # v1 Link: https://lore.kernel.org/r/20231211213233.2793525-1-dhowells@redhat.com/ # v2 Link: https://lore.kernel.org/r/20231212144611.3100234-1-dhowells@redhat.com/ # v3 Changes ======= ver #4) - Reduce the negative timeout from 10s to 1s. ver #3) - Rebased to v6.7-rc5 which has an additional afs patch. - Don't add to TIME64_MAX (ie. permanent) when checking expiry time. ver #2) - Fix signed-unsigned comparison when checking return val. David Howells (3): afs: Fix the dynamic root's d_delete to always delete unused dentries afs: Fix dynamic root lookup DNS check keys, dns: Allow key types (eg. DNS) to be reclaimed immediately on expiry fs/afs/dynroot.c | 31 +++++++++++++++++-------------- include/linux/key-type.h | 1 + net/dns_resolver/dns_key.c | 10 +++++++++- security/keys/gc.c | 31 +++++++++++++++++++++---------- security/keys/internal.h | 11 ++++++++++- security/keys/key.c | 15 +++++---------- security/keys/proc.c | 2 +- 7 files changed, 64 insertions(+), 37 deletions(-)