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From: "egmont at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug locale/18927] New: Different strings should never collate as equal
Date: Sun, 06 Sep 2015 22:21:00 -0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: locale
X-Bugzilla-Version: 2.21
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X-Bugzilla-Who: egmont at gmail dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=18927

            Bug ID: 18927
           Summary: Different strings should never collate as equal
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: locale
          Assignee: unassigned at sourceware dot org
          Reporter: egmont at gmail dot com
  Target Milestone: ---

Bug 13547 manually fixed a case where two distinct strings collated as equal.
Bug 16527 is another, currently unresolved case. Probably there are other, yet
undiscovered cases as well, and new ones might appear in the future.

This causes confusion with programs such as sort (the order is undefined, might
vary from run to run), or uniq (different lines being reported as equal).

I think there should be a safeguard code so that no locale definition can
result in this ever happening.

One possible approach I can imagine: Change the current strxfrm() magic to
produce an output that's restricted to bytes in the 2-255 range. Then append a
0x01 byte followed by the original string's literal copy.

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