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Date: Wed, 11 Nov 2020 19:38:00 -0800
From: Paul Eggert <eggert@...ucla.edu>
To: Bruno Haible <bruno@...sp.org>
Cc: bug-gnulib@....org, Simon Josefsson <simon@...efsson.org>,
Pádraig Brady <P@...igBrady.com>, musl@...ts.openwall.com
Subject: Re: parse-datetime test failure
On 11/11/20 8:20 AM, Bruno Haible wrote:
> It works fine on Alpine Linux 3.7 (32-bit, 64-bit) and 3.9 (64-bit).
>
> On Alpine Linux 3.10 and 3.12 (64-bit) it fails:
> ../../gltests/test-parse-datetime.c:448: assertion 'result.tv_sec == 1 * 60 * 60 + 2 * 60 + 3 && result.tv_nsec == 123456789' failed
> Aborted
>
> So, to me it looks like a regression between Alpine Linux 3.9 and 3.10.
It's arguably a bug in the test case, since Alpine uses musl libc which does not
support time zone abbreviations longer than 6 bytes, whereas the test case uses
an time zone abbreviation of 2000 bytes (to test a bug in an old Gnulib version
when running on GNU/Linux). POSIX does not define behavior if you go over the limit.
I worked around the problem by changing the test case to not go over the limit
as determined by sysconf (_SC_TZNAME_MAX), in the first attached patch. Plus I
refactored and/or slightly improved the Gnulib overflow checking while I was in
the neighborhood (last two attached patches).
Arguably this is a quality-of-implementation issue here, since Alpine and/or
musl goes beserk with long timezone abbreviations whereas every other
implementation I know of either works or silently substitutes localtime or UTC
(which is good enough for this test case). But I'll leave that issue to the
Alpine and/or musl libc folks.
I'll cc this to the musl bug reporting list. Although the Gnulib test failure
has been fixed, it may be the symptom of a more-severe bug in musl. For those
new to the problem, this thread starts here:
https://lists.gnu.org/r/bug-gnulib/2020-11/msg00039.html
View attachment "0001-parse-datetime-tests-port-to-Alpine-Linux-3.12.1.patch" of type "text/x-patch" (2760 bytes)
View attachment "0002-parse-datetime-streamline-overflow-checking.patch" of type "text/x-patch" (7200 bytes)
View attachment "0003-time_rz-simplify-CVE-2017-7476-fix.patch" of type "text/x-patch" (2635 bytes)
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