Fedora 30: FEDORA-2019-ac2a21ff07 Critical: libxmlb Executable Stack

XML is slow to parse and strings inside the document cannot be memory mapped as

they do not have a trailing NUL char. The libxmlb library takes XML source, and

converts it to a structured binary representation with a deduplicated string

table -- where the strings have the NULs included.

This allows an application to mmap the binary XML file, do an XPath query and

return some strings without actually parsing the entire document. This is all

done using (almost) zero allocations and no actual copying of the binary data.

This update fixes a [bug](https://github.com/mesonbuild/meson/issues/5268) in

the Meson build system which caused binaries and libraries to incorrectly be

marking as requiring an executable stack. This makes them more vulnerable to

security issues, and also can result in errors caused by SELinux denials. This

update also provides rebuilds of all the packages that were built with the buggy

Meson, excepting packages for updates were already pending (in those cases,

those updates have been edited instead). This includes gnome-initial-setup,

which was affected by this problem, resulting in a [release-blocking

bug](https://bugzilla.redhat.com/show_bug.cgi?id=1699099) that prevented it

running correctly with SELinux in enforcing mode.

[ 1 ] Bug #1699099 - gnome-initial-setup 3.32.0+ crashes due to SELinux denials (because it has execstack flag set, because meson 0.50.0 sets it when it shouldn't)

https://bugzilla.redhat.com/show_bug.cgi?id=1699099

su -c 'dnf upgrade --advisory FEDORA-2019-ac2a21ff07' at the command

line. For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

All packages are signed with the Fedora Project GPG key. More details on the

GPG keys used by the Fedora Project can be found at

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