mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-13 06:53:23 +02:00
5f93c37805
It's critical that the backend's idea of LOBLKSIZE match the way data has actually been divided up in pg_largeobject. While we don't provide any direct way to adjust that value, doing so is a one-line source code change and various people have expressed interest recently in changing it. So, just as with TOAST_MAX_CHUNK_SIZE, it seems prudent to record the value in pg_control and cross-check that the backend's compiled-in setting matches the on-disk data. Also tweak the code in inv_api.c so that fetches from pg_largeobject explicitly verify that the length of the data field is not more than LOBLKSIZE. Formerly we just had Asserts() for that, which is no protection at all in production builds. In some of the call sites an overlength data value would translate directly to a security-relevant stack clobber, so it seems worth one extra runtime comparison to be sure. In the back branches, we can't change the contents of pg_control; but we can still make the extra checks in inv_api.c, which will offer some amount of protection against running with the wrong value of LOBLKSIZE. |
||
|---|---|---|
| config | ||
| contrib | ||
| doc | ||
| src | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| aclocal.m4 | ||
| configure | ||
| configure.in | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| Makefile | ||
| README | ||
| README.git | ||
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.