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Re: mmap64 with very large offset broken since glibc 2.26 (MIPS64 n32)
* Andrew Pinski:
>> For the patch itself, the only issue is I can't really create a
>> workable test without relying on something arch-specific. The
>> /dev/mem is tricky, it requires root access and it no portable
>> (not all architectures support that range of VMA). Same for a sparse
>> file of such size to trigger the issue, most FS don't support files
>> that large.
>
> Couldn't you use mmap on /dev/zero with the large offset for the
> testcase?
A memfd description (from memfd_create) would be worth a try as well.
XFS supports sparse files for the whole 63-bit range, too.
Thanks,
Florian