[PATCH] Fix wordsize-32 mmap offset for negative value (BZ#18877)

[Dmitry V. Levin]

On Wed, Jan 20, 2016 at 09:44:26PM +0000, Joseph Myers wrote:
> I'm looking at failures of this new test for MIPS, but am puzzled by the 
> descriptions of this issue in terms of things being incorrect and fixed 
> without any statement of what is actually correct or why that is correct.
> 
> The expectation in the test seems to be that negative offsets passed to 
> mmap should be interpreted as large unsigned values.  But I can't find 
> anything in POSIX, or in the glibc manual, or in the Linux man-pages 
> collection, to justify those semantics.  So what is the basis for that 
> interpretation as part of the glibc API (and for its being compatible with 
> POSIX), rather than negative arguments being considered invalid?

Is there any 32-bit kernel currently supported by glibc where underlying
system call doesn't operate with 4K or pagesize units for offsets?


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