Public bug reported:
Binary package hint: xscreensaver-data
/usr/bin/xscreensaver-text have format string bug .
test case :
emanuel@emanuel-desktop:~$ export HOME=/tmp
emanuel@emanuel-desktop:~$ echo "*textMode:Format_string_%n_bug" >
/tmp/.xscreensaver
emanuel@emanuel-desktop:~$ xscreensaver-text --verbose --verbose
xscreensaver-text: reading /tmp/.xscreensaver
Modification of a read-only value attempted at /usr/bin/xscreensaver-text line
191.
the bug can be found at :
if ($verbose > 1) {
printf STDERR "$progname: mode: $text_mode\n";
printf STDERR "$progname: literal: $text_literal\n";
printf STDERR "$progname: file: $text_file\n";
printf STDERR "$progname: program: $text_program\n";
printf STDERR "$progname: url: $text_url\n";
}
Fix can be using print instead or add format %s to printf .
** Affects: xscreensaver (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/781948
Title:
Format string bug in xscreensaver-text
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