[Bug 160284] bad mmap causes cores in KPCMemoryDevice

[Matthew Woehlke]

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http://bugs.kde.org/show_bug.cgi?id=160284         




------- Additional Comments From mw_triad users sourceforge net  2008-06-02 18:08 -------
> I can reliably reproduce SIGBUS if I truncate the shared file.  However, if I do nothing but unlink the shared file then everything continues as normal.

That's not surprising; in fact now that you mention it, it makes sense that a truncate could hose an otherwise valid mmap. I would have expected unlinking to be safe, but it's not clear if mmap preserves a handle (but it should be safe as long as you don't call close() on the fd until you've munmap'd everything, since on UNIX-y systems an unlinked file isn't gone until all handles are closed).