Bug #13606
closed
tic(1) writes uninitialized data to some terminfo entries
100%
Description
I tripped wsdiff in the nansi.sysk terminfo entry, it turns out to be because for dubious reasons tic(1) avoids offsets of 255 stating that "Vr2 binaries read it as -1", and in doing so will write a junk byte between the trailing NUL of the previous string table entry,
and the start of the current one, tripping wsdiff. It should write a NUL instead.
Probably, the paranoia around 255 is unwarranted, but that's going to come up in consumers and is likely not worth the testing load.
(even more probably, we should just use the ncurses tic(1), but that has the same testing load of making sure our 3 other curses libraries are ok with it)
Updated by Rich Lowe about 1 year ago
Tested with diffs of infocmp(1) output, valgrind to check the uninitialized memory was no longer written.
; (for elt in **/*(.); diff -u <(env TERMINFO=/usr/share/lib/terminfo infocmp ${elt:t} | grep -v '^#') <(env TERMINFO=$PWD infocmp ${elt:t} | grep -v '^#')) | head
Updated by Electric Monk about 1 year ago
- Status changed from In Progress to Closed
- % Done changed from 0 to 100
git commit 2587b3a0593a431a99cc2dc78bf1034e672a35e2
commit 2587b3a0593a431a99cc2dc78bf1034e672a35e2
Author: Richard Lowe <richlowe@richlowe.net>
Date: 2021-03-09T20:57:24.000Z
13606 tic(1) writes uninitialized data to some terminfo entries
Reviewed by: Andy Fiddaman <andy@omnios.org>
Reviewed by: Jason King <jason.brian.king+illumos@gmail.com>
Approved by: Robert Mustacchi <rm@fingolfin.org>