Possible bug in fortified stpncpy

[Zack Weinberg]

On 08/08/2015 11:32 PM, Mike Frysinger wrote:
> On 08 Aug 2015 17:06, Zack Weinberg wrote:
>> [stpncpy] should call the runtime-checking function
>> if __n is not constant, or if __n is known to be LARGER
>> than the size of the destination.  Ne?
> 
> agreed.  feel like sending a patch ? :)

Patch is attached.  In addition to the actual two-character bugfix, I
enhanced debug/tst-chk1.c to catch this and similar bugs.  I also filed
https://sourceware.org/bugzilla/show_bug.cgi?id=18795 and I suspect this
needs to get backported as widely as possible.

(Is there a way to run just one subdirectory's tests?  This was tedious
to develop, what with string.h getting used basically everywhere.)

zw

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