The DNS Flag Day 2020 reduced all the EDNS buffer sizes to 1232. In
this commit, we revert the default value for nocookie-udp-size back to
4096 because the option is too obscure and most people don't realize
that they also need to change this configuration option in addition to
max-udp-size.
(cherry picked from commit 79c196fc77)
Since the queries sent towards root and TLD servers are now included in
the count (as a result of the fix for CVE-2020-8616),
"max-recursion-queries" has a higher chance of being exceeded by
non-attack queries. Increase its default value from 75 to 100.
(cherry picked from commit ab0bf49203)
Every DocBook source document can be namespaced (DocBook 5) or
non-namespaced (DocBook 4). The set of XSL stylesheets used for
producing an output document can also be namespaced or non-namespaced.
Namespaced source documents should be used with namespaced stylesheets
and non-namespaced source documents should be used with non-namespaced
stylesheets. However, both stylesheet flavors contain processing rules
which allow them to be used interchangeably for any type of source
document.
Unfortunately, these processing rules became broken in version 1.79.1 of
the stylesheets, which means that non-namespaced source documents can no
longer be correctly transformed into man pages using namespaced
stylesheets and vice versa. This problem was fixed upstream [1], but no
released version of the XSL stylesheets contains that fix yet.
Back in 2016, this problem was reported as RT #43831 and allegedly fixed
in commit 1b8ce3b330. However, that fix
only helped for the non-namespaced version of the stylesheets - while
also breaking man page generation for the namespaced flavor.
Since using namespaced DocBook sources is the current best practice
(DocBook 5), make BIND DocBook sources namespaced again. When using
version 1.79.1 or 1.79.2 of the XSL stylesheets, care must be taken to
ensure namespaced stylesheets are used for generating BIND
documentation.
[1] https://github.com/docbook/xslt10-stylesheets/issues/109
The DNS Flag Day 2020 aims to remove the IP fragmentation problem from
the UDP DNS communication. In this commit, we implement the minimal
required changes by changing the defaults for `edns-udp-size`,
`max-udp-size` and `nocookie-udp-size` to `1232` (the value picked by
DNS Flag Day 2020).
(cherry picked from commit bb990030d3)
(cherry picked from commit df06773f9a73e4a4bb0b5e7f4bd8e40394e64032)
Mark Andrews
Michał Kępień
Tinderbox UserandMichał Kępień
Michal Nowak
Ondřej SurýandOndřej Surý
