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* [Bug libc/15473] New: null pointer handling in strcmp
@ 2013-05-16 3:53 htpcucxo at yahoo dot co.jp
2013-05-16 3:55 ` [Bug libc/15473] " htpcucxo at yahoo dot co.jp
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: htpcucxo at yahoo dot co.jp @ 2013-05-16 3:53 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15473
Bug #: 15473
Summary: null pointer handling in strcmp
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: unassigned@sourceware.org
ReportedBy: htpcucxo@yahoo.co.jp
CC: drepper.fsp@gmail.com
Classification: Unclassified
When we use strcmp(p, NULL) with Unix machine, It returns zero.
But on Linux(glibc) it results into crash.
I know in this case, the behavior of strcmp is "undefined".
So it's not bug, but since it's useful for the user to port to Linux
from other Unix, it would be nice to select the option etc.
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* [Bug libc/15473] null pointer handling in strcmp
2013-05-16 3:53 [Bug libc/15473] New: null pointer handling in strcmp htpcucxo at yahoo dot co.jp
@ 2013-05-16 3:55 ` htpcucxo at yahoo dot co.jp
2013-05-16 3:59 ` bugdal at aerifal dot cx
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: htpcucxo at yahoo dot co.jp @ 2013-05-16 3:55 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15473
htpcucxo at yahoo dot co.jp changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
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* [Bug libc/15473] null pointer handling in strcmp
2013-05-16 3:53 [Bug libc/15473] New: null pointer handling in strcmp htpcucxo at yahoo dot co.jp
2013-05-16 3:55 ` [Bug libc/15473] " htpcucxo at yahoo dot co.jp
@ 2013-05-16 3:59 ` bugdal at aerifal dot cx
2013-05-16 4:09 ` carlos at redhat dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: bugdal at aerifal dot cx @ 2013-05-16 3:59 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15473
Rich Felker <bugdal at aerifal dot cx> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bugdal at aerifal dot cx
--- Comment #1 from Rich Felker <bugdal at aerifal dot cx> 2013-05-16 03:58:56 UTC ---
All this change would do is hide application bugs and reduce performance. I'm
strongly against it.
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* [Bug libc/15473] null pointer handling in strcmp
2013-05-16 3:53 [Bug libc/15473] New: null pointer handling in strcmp htpcucxo at yahoo dot co.jp
2013-05-16 3:55 ` [Bug libc/15473] " htpcucxo at yahoo dot co.jp
2013-05-16 3:59 ` bugdal at aerifal dot cx
@ 2013-05-16 4:09 ` carlos at redhat dot com
2013-05-16 7:20 ` schwab@linux-m68k.org
2014-06-13 17:45 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: carlos at redhat dot com @ 2013-05-16 4:09 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15473
Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |carlos at redhat dot com
Resolution| |WONTFIX
--- Comment #2 from Carlos O'Donell <carlos at redhat dot com> 2013-05-16 04:09:05 UTC ---
(In reply to comment #0)
> When we use strcmp(p, NULL) with Unix machine, It returns zero.
> But on Linux(glibc) it results into crash.
>
> I know in this case, the behavior of strcmp is "undefined".
> So it's not bug, but since it's useful for the user to port to Linux
> from other Unix, it would be nice to select the option etc.
This hides real bugs.
It also appears to incorrectly imply that NULL is equal to every string.
If you really want this kind of change then you need to talk to the standards
authors in the Austin Group (POSIX) and at your local ISO national body for
SC22/WG14.
Until then marking as resolved wontfix.
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* [Bug libc/15473] null pointer handling in strcmp
2013-05-16 3:53 [Bug libc/15473] New: null pointer handling in strcmp htpcucxo at yahoo dot co.jp
` (2 preceding siblings ...)
2013-05-16 4:09 ` carlos at redhat dot com
@ 2013-05-16 7:20 ` schwab@linux-m68k.org
2014-06-13 17:45 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: schwab@linux-m68k.org @ 2013-05-16 7:20 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15473
Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|WONTFIX |INVALID
--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> 2013-05-16 07:20:08 UTC ---
There is nothing to fix here. NULL cannot sensibly be ordered with non-NULL
values, so it is impossible to define a return value. Talking to ISO would be
a waste of time.
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* [Bug libc/15473] null pointer handling in strcmp
2013-05-16 3:53 [Bug libc/15473] New: null pointer handling in strcmp htpcucxo at yahoo dot co.jp
` (3 preceding siblings ...)
2013-05-16 7:20 ` schwab@linux-m68k.org
@ 2014-06-13 17:45 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 17:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15473
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-13 17:45 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2013-05-16 3:53 [Bug libc/15473] New: null pointer handling in strcmp htpcucxo at yahoo dot co.jp
2013-05-16 3:55 ` [Bug libc/15473] " htpcucxo at yahoo dot co.jp
2013-05-16 3:59 ` bugdal at aerifal dot cx
2013-05-16 4:09 ` carlos at redhat dot com
2013-05-16 7:20 ` schwab@linux-m68k.org
2014-06-13 17:45 ` fweimer at redhat dot com
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