[PATCH v4 0/3] afs: Fix dynamic root interaction with failing DNS lookups

[Jeffrey E Altman]

On 12/21/2023 8:45 AM, David Howells wrote:
> 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(-)
>
>
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Reviewed-by: Jeffrey Altman <jaltman at auristor.com>

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