https://bugzilla.mindrot.org/show_bug.cgi?id=3349
--- Comment #4 from Darren Tucker <dtuc...@dtucker.net> ---
(In reply to Florian Weimer from comment #3)
> Does closefrom actually return in your test, or does it crash the
> process?
Based on the glibc sources it looks like it throws an error and
terminates due to FORTIFY_SOURCE:
void
__closefrom (int lowfd)
{
int maxfd = __getdtablesize ();
if (maxfd == -1)
__fortify_fail ("closefrom failed to get the file descriptor table
size");
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