Messages in this thread |  | | Date | Mon, 15 Oct 2001 13:24:59 +0200 | From | Jamie Lokier <> | Subject | Re: Security question: "Text file busy" overwriting executables but not shared libraries? |
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Aaron Lehmann wrote: > > > But it does have the advantage of allowing the sharing of memory, does > > > it not? > > > > Only if you are going to write to the data. > > Why? If gcc and another application read the source file with an > mmap() with the right parameters (read-only), it would only be shared > between them, as I understand it. If they both read() the file into > private buffers those can not be shared.
And furthermore, the private buffers cannot be shared with the filesystem's page cache.
-- Jamie
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