Ubuntu 23.04 (Lunar Lobster) has reached end of life, so this bug will
not be fixed for that specific release.
** Changed in: zlib (Ubuntu Lunar)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/2018293
Title:
[UBUNTU 20.04] Crash in zlib deflateBound() function on s390x
Status in Ubuntu on IBM z Systems:
In Progress
Status in zlib package in Ubuntu:
Fix Released
Status in zlib source package in Focal:
New
Status in zlib source package in Jammy:
New
Status in zlib source package in Lunar:
Won't Fix
Status in zlib source package in Mantic:
Fix Released
Bug description:
SRU Justification:
==================
[ Impact ]
* The zlib deflateBound() function can crash on s390x,
if called before deflateInit().
* The solution is that zlib on s390x needs to support
calling deflateBound() always before deflateInit().
[ Test Plan ]
* It's suggested to do a more overall or e2e test
and run the zlib-ng test suite against the system zlib
as follows:
$ git clone https://github.com/zlib-ng/zlib-ng.git
$ cd zlib-ng
$ cmake -DZLIB_COMPAT=ON -DZLIBNG_ENABLE_TESTS=OFF -DBUILD_SHARED_LIBS=ON
-DWITH_DFLTCC_DEFLATE=ON -DWITH_DFLTCC_INFLATE=ON .
$ make gtest_zlib
$ ldd gtest_zlib
libz.so.1 => /lib/s390x-linux-gnu/libz.so.1 (0x000003fff7e00000)
$ ./gtest_zlib
[ Where problems could occur ]
* The only (single line) modification is in the if condition
of the define DEFLATE_BOUND_ADJUST_COMPLEN statement in
deflate.c.
* Things can go wrong if the condition (or logic) is wrong,
* or if other parts of the code are coded against the old behavior
and are still expecting it.
* The likely outcome would be still a crash
or an unexpected behavior.
[ Other Info ]
* Getting this into mantic first,
before the SRU down to focal is done.
__________
Problem Description:
zlib deflateBound() function can crash on s390x when called before
deflateInit().
Solution:
zlib on s390x needs to support calling deflateBound() before deflateInit().
The fix is squashed into the latest DFLTCC PR:
https://github.com/madler/zlib/pull/410
Diff:
https://github.com/madler/zlib/compare/113203437eda67261848b14b6c80a33ff7e33d34..f6d382a91a4e7d88b9b12ce0ecdffb1783878160
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