CVE Request: libceph auth token overflow

[Marcus Meissner <meissner () suse de>]

Hi,

spotted by Brad, has no CVE id yet.

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c27a3e4d667fdcad3db7b104f75659478e0c68d8

libceph: do not hard code max auth ticket len

We hard code cephx auth ticket buffer size to 256 bytes. This isn't enough for
any moderate setups and, in case tickets themselves are not encrypted, leads to
buffer overflows (ceph_x_decrypt() errors out, but ceph_decode_copy() doesn't -
it's just a memcpy() wrapper). Since the buffer is allocated dynamically
anyway, allocated it a bit later, at the point where we know how much is going
to be needed.

Fixes: http://tracker.ceph.com/issues/8979


Ciao, marcus