Re: [PATCH 2/7] FS-Cache: fix dereference of NULL user_key_payload

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, 28 Sep 2017, Eric Biggers wrote:

> From: Eric Biggers <ebiggers@xxxxxxxxxx>
> 
> When the file /proc/fs/fscache/objects (available with
> CONFIG_FSCACHE_OBJECT_LIST=y) is opened, we request a user key with
> description "fscache:objlist", then access its payload.  However, a
> revoked key has a NULL payload, and we failed to check for this.
> request_key() *does* skip revoked keys, but there is still a window
> where the key can be revoked before we access its payload.
> 
> Fix it by checking for a NULL payload, treating it like a key which was
> already revoked at the time it was requested.
> 
> Fixes: 4fbf4291aa15 ("FS-Cache: Allow the current state of all objects to be dumped")
> Cc: <stable@xxxxxxxxxxxxxxx>    [v2.6.32+]
> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>


Reviewed-by: James Morris <james.l.morris@xxxxxxxxxx>


-- 
James Morris
<jmorris@xxxxxxxxx>

--
To unsubscribe from this list: send the line "unsubscribe ecryptfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Crypto]     [Device Mapper Crypto]     [LARTC]     [Bugtraq]     [Yosemite Forum]

  Powered by Linux