Message241461
Coverity has found a potential buffer overflow in the unicodedata module. The function call _getcode() which calls _cmpname(). _cmpname() copies data into fixed size buffer of length NAME_MAXLEN. Neither lookup() nor _getcode() limit name_length to NAME_MAXLEN. Therefore the buffer could theoretical overflow.
In practice the buffer overflow can't be abused because Tools/unicode/makeunicodedata.py already limits max name length. I still like to fix the bug because it is a low hanging fruit. In most versions of Python the code already checks that name_length fits in INT_MAX.
CID 1295028 (#1 of 1): Out-of-bounds access (OVERRUN)
overrun-call: Overrunning callee's array of size 256 by passing argument (int)name_length (which evaluates to 2147483647) in call to _getcode |
|
Date |
User |
Action |
Args |
2015-04-18 22:32:38 | christian.heimes | set | recipients:
+ christian.heimes, lemburg, pitrou, vstinner, benjamin.peterson, ezio.melotti, serhiy.storchaka |
2015-04-18 22:32:38 | christian.heimes | set | messageid: <1429396358.28.0.910833101692.issue23997@psf.upfronthosting.co.za> |
2015-04-18 22:32:38 | christian.heimes | link | issue23997 messages |
2015-04-18 22:32:37 | christian.heimes | create | |
|