AW: Long PV names in EPICS base

["Zimoch Dirk \(PSI\) via Core-talk" <core-talk at aps.anl.gov>]

I mean : If not recompiled. E.g., not your program but some user's who brought the compiled program with them.

 

Programs assuming that PVNAME_STRINGSZ is always enough memory to store a record name unchecked may get buffer overruns.

 

Von: Core-talk <core-talk-bounces at aps.anl.gov> Im Auftrag von Simon Rose via Core-talk
Gesendet: Freitag, 14. Januar 2022 09:32
An: AppVeyor via Core-talk <core-talk at aps.anl.gov>
Betreff: Long PV names in EPICS base

 

Hi all -

 

Suppose that we wanted to allow EPICS to have longer PV names than the default 60 characters. It seems that this is possible by modifying two files:

• PVNAME_STRINGSZ in modules/libcom/src/misc/dbDefs.h
• The “Record Name” field in modules/database/src/ioc/db/dbCommon.dbd.pod

 

If you modify these two locations, then you can have records with PVs whose names are longer. ca/pvget/put seem to work find regardless, so this seems like a very simple change. However…

 

Is there anything else that is missing that would need to be changed here? In particular, I wonder if there are any concerns with linking records to each other, or any other unexpected consequences.

 

Thanks,

 

______________________

 

Simon Rose

Software Engineer

Control System Software and Services

 

European Spallation Source ERIC

P.O. Box 176, SE-221 00 Lund, Sweden

Visiting address: Partikelgatan 2, 224 84 Lund

Mobile: +46 72 179 23 07

E-mail: simon.rose at ess.eu