** Description changed: [Impact] * After an update of ghostscript but not cups-filters - (which is possible) users may hit errors printing PDF files (LP#1828401). + + * This is possible as Landscape does not consider the + -security pocket (has both ghostscript/cups-filters) + but rather USN notices and ghostscript had a notice [0]. + The regression on cups-filters was identified later, + and doesn't warrant a USN notice. * So, to ensure that ghostscript and cups-filters are both updated, add a versioned 'Breaks:' relationship to ghostscript for older cups-filters versions which are not yet fixed. Per Debian Policy [1]: """ Normally a Breaks entry will have an “earlier than” version clause; such a Breaks is introduced in the version ... [that] reveals a bug in earlier versions of the broken package ... This use of Breaks will inform higher-level package management tools that the broken package must be upgraded before the new one. """ * A versioned 'Depends:' relationship is not possible as ghostscript doesn't depend on cups-filters, thus it's possible to have ghostscript installed without cups-filters at all. + + * This doesn't fix the current situation with Landscape + and USNs so this same problem might still occur again, + but at least it is already in place on future updates. [Test Case] * Install cups-filters version without fix for LP#1828401: 1.20.2-0ubuntu3 in Bionic, and 1.8.3-2ubuntu3.4 in Xenial. * Update ghostscript to/later than fix for CVE-2019-3839-1/-2 9.26~dfsg+0-0ubuntu0.18.04.9 in Bionic / .16.04.9 in Xenial. * Notice it does _not_ update cups-filters to version with fix: 1.20.2-0ubuntu3.1 in Bionic, and 1.8.3-2ubuntu3.5 in Xenial. * $ wget -O ppd-with-pdf-support.ppd \ 'http://www.openprinting.org/ppd-o-matic.php?driver=hl7x0&printer=Brother-HL-1020&show=1' * $ wget -O dummy.pdf \ https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf * $ foomatic-rip -v --ppd ppd-with-pdf-support.ppd dummy.pdf ... Filetype: PDF GPL Ghostscript 9.26: Unrecoverable error, exit code 1 Process is dying with "Unable to determine number of pages, page count: -1 ", exit stat 3 ... * Note it's broken. * Install ghostscript (test) packages with the relationships 'Breaks: cups-filters (<< 1.20.2-0ubuntu3.1)' in Bionic or 'Breaks: ..., cups-filters (<< 1.8.3-2ubuntu3.5)' in Xenial. * Note it _does_ update cups-filters to version with fix. * $ foomatic-rip -v --ppd ppd-with-pdf-support.ppd dummy.pdf ... Filetype: PDF File contains 1 pages Starting renderer with command: <...> ... * Note it's now working. [Regression Potential] * Low. This only causes an update to cups-filters to a version that fixes an already identified/resolved problem (LP#1828401), which is available in bionic- & xenial-updates since May 2019. [Other Info] * This is only required in Xenial and Bionic. * Trusty doesn't have the ghostscript update that causes the problem. * Disco/Eoan have the cups-filters fix that it requires (1.22.5+). - [1] https://www.debian.org/doc/debian-policy/ch-relationships.html - #packages-which-break-other-packages-breaks + [Links] + + [0] https://usn.ubuntu.com/3970-1/ + [1] https://www.debian.org/doc/debian-policy/ch-relationships.html#packages-which-break-other-packages-breaks
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1848210 Title: ghostscript: ensure update of cups-filter To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups-filters/+bug/1848210/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
