C99 (at least the draft that’s available online) actually defines this
code as invalid.
#include <stdio.h>
int sprintf(char * restrict s, const char * restrict format, ...);
“The sprintf function is equivalent to fprintf, except that the output is
written into an array (specified by the argument s) rather than to a stream. A
null character is written at the end of the characters written; it is not
counted as part of the returned value. If copying takes place between objects
that overlap, the behavior is undefined.”
So I guess the real answer is to fix the affected source. It might be
nice to know if any software in Ubuntu is affected.
** Changed in: gcc-4.3 (Ubuntu)
Status: New => Invalid
--
Intrepid gcc -O2 breaks string appending with sprintf(), due to fortify source
patch
https://bugs.launchpad.net/bugs/305901
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