[dm-devel] [PATCH 4/4] libmpathpersist: ABI change: limit data-in/out size to 8192 bytes

[Martin Wilck]

On Sun, 2020-03-15 at 01:27 +0100, Martin Wilck wrote:
> 
> A program written against the old API might assume that the length of
> private_buffer was MPATH_MAX_PARAM_LEN, and call e.g.
> memset(private_buffer, 0, MPATH_MAX_PARAM_LEN), overwriting
> num_transportid.

And programs compiled against old headers would obviously use the
wrong offsets for num_transportids and trnptid_list.

Similar for struct print_fulldescr_list.descriptors.

So I this does indeed break the ABI. Perhaps we shouldn't apply this
without implementing clean so numbering.

Regards
Martin