From 716560b7f15b6e15b246c39c11eb8181d91c8662 Mon Sep 17 00:00:00 2001 From: Joey Hess Date: Wed, 12 Nov 2008 17:19:41 -0500 Subject: check for invalid utf-8, and toss it back to avoid crashes Since ikiwiki uses open :utf8, perl assumes that files contain valid utf-8. If it turns out to be malformed it may later crash while processing strings read from them, with 'Malformed UTF-8 character (fatal)'. As at least a quick fix, use utf8::valid as soon as data is read, and if it's not valid, call encode_utf8 on the string, thus clearing the utf-8 flag. This may cause follow-on encoding problems, but will avoid this crash, and the input file was broken anyway, so GIGO is a reasonable response. (I looked at calling decode_utf8 after, but it seemed to cause more trouble than it was worth. BTW, use open ':encoding(utf8)' avaoids this problem, but the corrupted data later causes Storable to crash when writing the index.) This is a quick fix, clearly imperfect: - It might be better to explicitly call decode_utf8 when reading files, rather than using the IO layer. - Data read other than by readfile() can still sneak in bad utf-8. While ikiwiki does very little file input not using it, stdin for the CGI would be one way. --- debian/changelog | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'debian') diff --git a/debian/changelog b/debian/changelog index 99f35482e..3838a3e90 100644 --- a/debian/changelog +++ b/debian/changelog @@ -1,3 +1,9 @@ +ikiwiki (2.70) UNRELEASED; urgency=low + + * Avoid crash on malformed utf-8 discovered by intrigeri. + + -- Joey Hess Wed, 12 Nov 2008 17:30:33 -0500 + ikiwiki (2.69) unstable; urgency=low * Avoid multiple ikiwiki cgi processes piling up, eating all memory, -- cgit v1.2.3