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Hello...

[..]
>> 
>> As reported, the crashing application is hwclock,
>> (util-linux-2.26), this a kind of code in the field for a very
>> very long time,
> 
> And it either crashes every time it's run (for a given
> configuration, at least) or doesn't. If it does you know during
> early testing rather than letting a bug slip through.
> 
>> so the library (glibc and old libc) used for linux over the years
>> defined an expected behavior to this "UB".
> 
> No, that was merely a bug in glibc, not a feature.

Hmmm... glibc-2.21, setenv.c explicitly check the value NULL
condition, so situation is checked, you could object about
the way program handle it, but it is not a bug (situation
expected and addressed).


> Crashing is inevitable on the vast majority of invalid programs. 
> setenv("TZ", (char *)0xdeadbeef, 1); will almost certainly crash,
> and if it doesn't it will likely do something worse.
Fully agreed, this is pure garbage, out of spec. library
will/must crash (protect the hardware).
> 
>> (:-} why bother to return an error, just crash for all problems
>> in open, close, write, etc. just bringing the crashing concept to
>> the extreme :-}).
> 

> 
> int foo(const char *fn) { char buf[2]; strcpy(buf, "hello world,
> and goodbye");

In perfect world, strcpy should crash on the spot not going further.
this is clearly "out of spec" (a far fetch to be UB).


> int fd = open(fn ? fn : buf, O_RDONLY); return fd < 0 ? -1 : fd; }



- -- 

A bientôt
===========================================================
Jean-Marc Pigeon                        E-Mail: jmp@safe.ca
SAFE Inc.                             Phone: (514) 493-4280
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