Date: Mon, 3 Jan 2000 21:54:28 -0500 (EST) From: "Crist J. Clark" <cjc@cc942873-a.ewndsr1.nj.home.com> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/15872: Y2k bug in at(1) Message-ID: <200001040254.VAA11470@cc942873-a.ewndsr1.nj.home.com>
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>Number: 15872
>Category: bin
>Synopsis: Y2k bug in at(1)
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Jan 3 19:00:01 PST 2000
>Closed-Date:
>Last-Modified:
>Originator: Crist J. Clark
>Release: FreeBSD 3.4-STABLE i386
>Organization:
>Environment:
Present in all FreeBSD versions checked (2.x.x and 3.x). Also
seen in other BSDs.
>Description:
There is a Y2k bug in at(1). The following portion of code
can cause valid time specifications to return 'garbled time' errors,
/*
* assign_date() assigns a date, wrapping to next year if needed
*/
static void
assign_date(struct tm *tm, long mday, long mon, long year)
{
if (year > 99) {
if (year > 1899)
year -= 1900;
else
panic("garbled time");
} ...
When this function is passed the current year in tm_year format, 100,
it will complain it is a garbled time. However, it is a legal value.
>How-To-Repeat:
Try to queue an atjob in the following manner,
% at 10:30am wed
at: garbled time
However, that is a legal command line.
>Fix:
The parsetime.c code, which is excerpted above, is a _very_
complex piece of work. I hesitate to write a patch to fix this small
problem since it might create greater ones. I leave it to someone with
more familiarity with the code. (However, I am not sure why the
'year > 99' check is needed at all.)
In the mean time, the previous command line can will work if
you phrase it,
% at 10:30 + 2 days
You may need to try other convoluted constructions to work around
other formats that might trigger the bug.
>Release-Note:
>Audit-Trail:
>Unformatted:
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