https://bugs.kde.org/show_bug.cgi?id=274189
--- Comment #3 from Eric Hoffman <ehoff...@videotron.ca> ---
I added a test case for this issue (see attachment).
This is NOT an undocumented feature:
If the value of old_size is zero, and old_address refers to a
shareable mapping (see mmap(2) MAP_SHARED), then mremap() will create
a new mapping of the same pages. new_size will be the size of the
new mapping and the location of the new mapping may be specified with
new_address; see the description of MREMAP_FIXED below. If a new
mapping is requested via this method, then the MREMAP_MAYMOVE flag
must also be specified.
Run the program, you get:
Initial map virtual address: 0x7f1498f8a000
Alias map virtual address : 0x7f1498f89000
Value at map : 0
Value at alias: 0
Value at map : 123
Value at alias: 123
Value at map : 456
Value at alias: 456
Run it in memcheck, you get EINVAL at the mremap.
Regards,
Eric
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