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Supposed bug found

From: Mecky, Walter (Allianz ASIC)
Subject: Supposed bug found
Date: Tue, 20 May 2008 09:34:10 +0200


I don't know if these addresses are current and so first I want to ask if this 
is the right one? I'm unsure because I found no newer stable version as 1.2.4 
at www.gzip.org and www.gnu.org.

I think I found a bug in gzip in all versions I explored: from 1.2.4 until 
1.3.12: if gzip is killed by some signal, for example SIGINT generated by the 
intr character from your tty, it does an exit(1). So the caller cannot detect 
that gzip was killed. It seems as a normal exit with exitcode 1.

So the shell shows in "$?" the value 1 which is wrong. It should be 128+2 or 
256+2. Some shells, for example bash, continue a script which the user want to 
terminate. They would not do this if they detect that a process dies because it 
was killed.

The fix would be easy: gzip should restore the signal handling to default after 
catching the signal and send this signal again to itself. I changed the 
sourcecode and can give it to you if you want?

Walter Mecky

Allianz Shared Infrastructure Services
AG2SES06 - Firewall Technologien und Netz Security
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