The FreeType Project - Bugs: bug #46372, slow run in TT_RunIns (#2)

You are not allowed to post comments on this tracker with your current authentication level.

bug #46372: slow run in TT_RunIns (#2)

Submitter:	Kostya Serebryany <kcc>
Submitted:	Tue 03 Nov 2015 07:23:55 PM UTC
Severity:	3 - Normal	Item Group:	None
Status:	Fixed	Privacy:	Public
Assigned to:	wl	Open/Closed:	Closed
Planned Release:	2.6.2

Wed 04 Nov 2015 04:17:28 PM UTC, comment #3:  The bot is much happier now, thanks! before: Done 256128 runs in 7201 second(s) after: Done 790478 runs in 7201 second(s)	Kostya Serebryany <kcc>
Wed 04 Nov 2015 10:50:04 AM UTC, comment #2:  Should be improved in git, please test.  As far as I can see, no further `shortcut' is possible. In the test fonts, we have composite glyphs with infinite recursion.  And to make things worse, the glyph referenced in the composite glyphs contains an infinite bytecode loop.  In other words, those invalid fonts are possibly the absolute worst case that can ever happen.	Werner LEMBERG <wl>
Tue 03 Nov 2015 07:25:43 PM UTC, comment #1:  one more input attached (file #35376)	Kostya Serebryany <kcc>
Tue 03 Nov 2015 07:23:55 PM UTC, original submission:   Found by the libFuzzer bot. despite the fixes in bug #46223, the bot still observes cases where a single input takes over 60 seconds to process, all time is spent inside TT_RunIns. This has put the fuzzer bot on its knees again :( If a fix is not possible (not yeasy, etc) any workaround would be welcome.	Kostya Serebryany <kcc>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attached Files

file #35376:  slow-unit-f643f9ba31dc673381848417001b0d9841895f3f added by kcc (9KiB - application/octet-stream)

file #35375:  slow-unit-566c4cb14b2027e7b2bc28834ca553cef2ffac31 added by kcc (9KiB - application/octet-stream)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List

-email is unavailable- added by wl (Posted a comment)

-email is unavailable- added by kcc (Submitted the item)

 

There are 0 votes so far. Votes easily highlight which items people would like to see resolved in priority, independently of the priority of the item set by tracker managers.

 

Follow 6 latest changes.

Date	Changed by	Updated Field	Previous Value	=>	Replaced by
2015-11-04	wl	Status	None		Fixed
		Assigned to	None		wl
		Open/Closed	Open		Closed
		Planned Release	None		2.6.2
2015-11-03	kcc	Attached File	-		Added slow-unit-f643f9ba31dc673381848417001b0d9841895f3f, #35376
2015-11-03	kcc	Attached File	-		Added slow-unit-566c4cb14b2027e7b2bc28834ca553cef2ffac31, #35375

Copyright © 2024 Free Software Foundation, Inc.
Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
The Levitating, Meditating, Flute-playing Gnu logo is a GNU GPL'ed image provided by the Nevrax Design Team.
Page source code