pgsql: Fix inadequately-sized output buffer in contrib/unaccent. - Mailing list pgsql-committers

From Tom Lane
Subject pgsql: Fix inadequately-sized output buffer in contrib/unaccent.
Date
Msg-id E1X1zu6-0000bb-PZ@gemulon.postgresql.org
Whole thread Raw
List pgsql-committers
Fix inadequately-sized output buffer in contrib/unaccent.

The output buffer size in unaccent_lexize() was calculated as input string
length times pg_database_encoding_max_length(), which effectively assumes
that replacement strings aren't more than one character.  While that was
all that we previously documented it to support, the code actually has
always allowed replacement strings of arbitrary length; so if you tried
to make use of longer strings, you were at risk of buffer overrun.  To fix,
use an expansible StringInfo buffer instead of trying to determine the
maximum space needed a-priori.

This would be a security issue if unaccent rules files could be installed
by unprivileged users; but fortunately they can't, so in the back branches
the problem can be labeled as improper configuration by a superuser.
Nonetheless, a memory stomp isn't a nice way of reacting to improper
configuration, so let's back-patch the fix.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/5a421a47eb1fc4398f42678c09e35aa72dc7cf18

Modified Files
--------------
contrib/unaccent/unaccent.c |   45 +++++++++++++++++++++++--------------------
1 file changed, 24 insertions(+), 21 deletions(-)


pgsql-committers by date:

Previous
From: Tom Lane
Date:
Subject: pgsql: Fix inadequately-sized output buffer in contrib/unaccent.
Next
From: Tom Lane
Date:
Subject: pgsql: Fix inadequately-sized output buffer in contrib/unaccent.